summaryrefslogtreecommitdiff
path: root/gcc/gimple-fold.c
blob: 5d464055a8359879ace52f4b24dd0a451fa212f6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836
5837
5838
5839
5840
5841
5842
5843
5844
5845
5846
5847
5848
5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
5865
5866
5867
5868
5869
5870
5871
5872
5873
5874
5875
5876
5877
5878
5879
5880
5881
5882
5883
5884
5885
5886
5887
5888
5889
5890
5891
5892
5893
5894
5895
5896
5897
5898
5899
5900
5901
5902
5903
5904
5905
5906
5907
5908
5909
5910
5911
5912
5913
5914
5915
5916
5917
5918
5919
5920
5921
5922
5923
5924
5925
5926
5927
5928
5929
5930
5931
5932
5933
5934
5935
5936
5937
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958
5959
5960
5961
5962
5963
5964
5965
5966
5967
5968
5969
5970
5971
5972
5973
5974
5975
5976
5977
5978
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988
5989
5990
5991
5992
5993
5994
5995
5996
5997
5998
5999
6000
6001
6002
6003
6004
6005
6006
6007
6008
6009
6010
6011
6012
6013
6014
6015
6016
6017
6018
6019
6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
6043
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057
6058
6059
6060
6061
6062
6063
6064
6065
6066
6067
6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
6089
6090
6091
6092
6093
6094
6095
6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
6128
6129
6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
6143
6144
6145
6146
6147
6148
6149
6150
6151
6152
6153
6154
6155
6156
6157
6158
6159
6160
6161
6162
6163
6164
6165
6166
6167
6168
6169
6170
6171
6172
6173
6174
6175
6176
6177
6178
6179
6180
6181
6182
6183
6184
6185
6186
6187
6188
6189
6190
6191
6192
6193
6194
6195
6196
6197
6198
6199
6200
6201
6202
6203
6204
6205
6206
6207
6208
6209
6210
6211
6212
6213
6214
6215
6216
6217
6218
6219
6220
6221
6222
6223
6224
6225
6226
6227
6228
6229
6230
6231
6232
6233
6234
6235
6236
6237
6238
6239
6240
6241
6242
6243
6244
6245
6246
6247
6248
6249
6250
6251
6252
6253
6254
6255
6256
6257
6258
6259
6260
6261
6262
6263
6264
6265
6266
6267
6268
6269
6270
6271
6272
6273
6274
6275
6276
6277
6278
6279
6280
6281
6282
6283
6284
6285
6286
6287
6288
6289
6290
6291
6292
6293
6294
6295
6296
6297
6298
6299
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312
6313
6314
6315
6316
6317
6318
6319
6320
6321
6322
6323
6324
6325
6326
6327
6328
6329
6330
6331
6332
6333
6334
6335
6336
6337
6338
6339
6340
6341
6342
6343
6344
6345
6346
6347
6348
6349
6350
6351
6352
6353
6354
6355
6356
6357
6358
6359
6360
6361
6362
6363
6364
6365
6366
6367
6368
6369
6370
6371
6372
6373
6374
6375
6376
6377
6378
6379
6380
6381
6382
6383
6384
6385
6386
6387
6388
6389
6390
6391
6392
6393
6394
6395
6396
6397
6398
6399
6400
6401
6402
6403
6404
6405
6406
6407
6408
6409
6410
6411
6412
6413
6414
6415
6416
6417
6418
6419
6420
6421
6422
6423
6424
6425
6426
6427
6428
6429
6430
6431
6432
6433
6434
6435
6436
6437
6438
6439
6440
6441
6442
6443
6444
6445
6446
6447
6448
6449
6450
6451
6452
6453
6454
6455
6456
6457
6458
6459
6460
6461
6462
6463
6464
6465
6466
6467
6468
6469
6470
6471
6472
6473
6474
6475
6476
6477
6478
6479
6480
6481
6482
6483
6484
6485
6486
6487
6488
6489
6490
6491
6492
6493
6494
6495
6496
6497
6498
6499
6500
6501
6502
6503
6504
6505
6506
6507
6508
6509
6510
6511
6512
6513
6514
6515
6516
6517
6518
6519
6520
6521
6522
6523
6524
6525
6526
6527
6528
6529
6530
6531
6532
6533
6534
6535
6536
6537
6538
6539
6540
6541
6542
6543
6544
6545
6546
6547
6548
6549
6550
6551
6552
6553
6554
6555
6556
6557
6558
6559
6560
6561
6562
6563
6564
6565
6566
6567
6568
6569
6570
6571
6572
6573
6574
6575
6576
6577
6578
6579
6580
6581
6582
6583
6584
6585
6586
6587
6588
6589
6590
6591
6592
6593
6594
6595
6596
6597
6598
6599
6600
6601
6602
6603
6604
6605
6606
6607
6608
6609
6610
6611
6612
6613
6614
6615
6616
6617
6618
6619
6620
6621
6622
6623
6624
6625
6626
6627
6628
6629
6630
6631
6632
6633
6634
6635
6636
6637
6638
6639
6640
6641
6642
6643
6644
6645
6646
6647
6648
6649
6650
6651
6652
6653
6654
6655
6656
6657
6658
6659
6660
6661
6662
6663
6664
6665
6666
6667
6668
6669
6670
6671
6672
6673
6674
6675
6676
6677
6678
6679
6680
6681
6682
6683
6684
6685
6686
6687
6688
6689
6690
6691
6692
6693
6694
6695
6696
6697
6698
6699
6700
6701
6702
6703
6704
6705
6706
6707
6708
6709
6710
6711
6712
6713
6714
6715
6716
6717
6718
6719
6720
6721
6722
6723
6724
6725
6726
6727
6728
6729
6730
6731
6732
6733
6734
6735
6736
6737
6738
6739
6740
6741
6742
6743
6744
6745
6746
6747
6748
6749
6750
6751
6752
6753
6754
6755
6756
6757
6758
6759
6760
6761
6762
6763
6764
6765
6766
6767
6768
6769
6770
6771
6772
6773
6774
6775
6776
6777
6778
6779
6780
6781
6782
6783
6784
6785
6786
6787
6788
6789
6790
6791
6792
6793
6794
6795
6796
6797
6798
6799
6800
6801
6802
6803
6804
6805
6806
6807
6808
6809
6810
6811
6812
6813
6814
6815
6816
6817
6818
6819
6820
6821
6822
6823
6824
6825
6826
6827
6828
6829
6830
6831
6832
6833
6834
6835
6836
6837
6838
6839
6840
6841
6842
6843
6844
6845
6846
6847
6848
6849
6850
6851
6852
6853
6854
6855
6856
6857
6858
6859
6860
6861
6862
6863
6864
6865
6866
6867
6868
6869
6870
6871
6872
6873
6874
6875
6876
6877
6878
6879
6880
6881
6882
6883
6884
6885
6886
6887
6888
6889
6890
6891
6892
6893
6894
6895
6896
6897
6898
6899
6900
6901
6902
6903
6904
6905
6906
6907
6908
6909
6910
6911
6912
6913
6914
6915
6916
6917
6918
6919
6920
6921
6922
6923
6924
6925
6926
6927
6928
6929
6930
6931
6932
6933
6934
6935
6936
6937
6938
6939
6940
6941
6942
6943
6944
6945
6946
6947
6948
6949
6950
6951
6952
6953
6954
6955
6956
6957
6958
6959
6960
6961
6962
6963
6964
6965
6966
6967
6968
6969
6970
/* Statement simplification on GIMPLE.
   Copyright (C) 2010-2016 Free Software Foundation, Inc.
   Split out from tree-ssa-ccp.c.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any
later version.

GCC is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "target.h"
#include "rtl.h"
#include "tree.h"
#include "gimple.h"
#include "predict.h"
#include "ssa.h"
#include "cgraph.h"
#include "gimple-pretty-print.h"
#include "fold-const.h"
#include "stmt.h"
#include "expr.h"
#include "stor-layout.h"
#include "dumpfile.h"
#include "gimple-fold.h"
#include "gimplify.h"
#include "gimple-iterator.h"
#include "tree-into-ssa.h"
#include "tree-dfa.h"
#include "tree-ssa.h"
#include "tree-ssa-propagate.h"
#include "ipa-utils.h"
#include "tree-ssa-address.h"
#include "langhooks.h"
#include "gimplify-me.h"
#include "dbgcnt.h"
#include "builtins.h"
#include "tree-eh.h"
#include "gimple-match.h"
#include "gomp-constants.h"
#include "optabs-query.h"
#include "omp-low.h"
#include "ipa-chkp.h"
#include "tree-cfg.h"
#include "fold-const-call.h"

/* Return true when DECL can be referenced from current unit.
   FROM_DECL (if non-null) specify constructor of variable DECL was taken from.
   We can get declarations that are not possible to reference for various
   reasons:

     1) When analyzing C++ virtual tables.
	C++ virtual tables do have known constructors even
	when they are keyed to other compilation unit.
	Those tables can contain pointers to methods and vars
	in other units.  Those methods have both STATIC and EXTERNAL
	set.
     2) In WHOPR mode devirtualization might lead to reference
	to method that was partitioned elsehwere.
	In this case we have static VAR_DECL or FUNCTION_DECL
	that has no corresponding callgraph/varpool node
	declaring the body.  
     3) COMDAT functions referred by external vtables that
        we devirtualize only during final compilation stage.
        At this time we already decided that we will not output
        the function body and thus we can't reference the symbol
        directly.  */

static bool
can_refer_decl_in_current_unit_p (tree decl, tree from_decl)
{
  varpool_node *vnode;
  struct cgraph_node *node;
  symtab_node *snode;

  if (DECL_ABSTRACT_P (decl))
    return false;

  /* We are concerned only about static/external vars and functions.  */
  if ((!TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
      || !VAR_OR_FUNCTION_DECL_P (decl))
    return true;

  /* Static objects can be referred only if they was not optimized out yet.  */
  if (!TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl))
    {
      /* Before we start optimizing unreachable code we can be sure all
	 static objects are defined.  */
      if (symtab->function_flags_ready)
	return true;
      snode = symtab_node::get (decl);
      if (!snode || !snode->definition)
	return false;
      node = dyn_cast <cgraph_node *> (snode);
      return !node || !node->global.inlined_to;
    }

  /* We will later output the initializer, so we can refer to it.
     So we are concerned only when DECL comes from initializer of
     external var or var that has been optimized out.  */
  if (!from_decl
      || !VAR_P (from_decl)
      || (!DECL_EXTERNAL (from_decl)
	  && (vnode = varpool_node::get (from_decl)) != NULL
	  && vnode->definition)
      || (flag_ltrans
	  && (vnode = varpool_node::get (from_decl)) != NULL
	  && vnode->in_other_partition))
    return true;
  /* We are folding reference from external vtable.  The vtable may reffer
     to a symbol keyed to other compilation unit.  The other compilation
     unit may be in separate DSO and the symbol may be hidden.  */
  if (DECL_VISIBILITY_SPECIFIED (decl)
      && DECL_EXTERNAL (decl)
      && DECL_VISIBILITY (decl) != VISIBILITY_DEFAULT
      && (!(snode = symtab_node::get (decl)) || !snode->in_other_partition))
    return false;
  /* When function is public, we always can introduce new reference.
     Exception are the COMDAT functions where introducing a direct
     reference imply need to include function body in the curren tunit.  */
  if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
    return true;
  /* We have COMDAT.  We are going to check if we still have definition
     or if the definition is going to be output in other partition.
     Bypass this when gimplifying; all needed functions will be produced.

     As observed in PR20991 for already optimized out comdat virtual functions
     it may be tempting to not necessarily give up because the copy will be
     output elsewhere when corresponding vtable is output.  
     This is however not possible - ABI specify that COMDATs are output in
     units where they are used and when the other unit was compiled with LTO
     it is possible that vtable was kept public while the function itself
     was privatized. */
  if (!symtab->function_flags_ready)
    return true;

  snode = symtab_node::get (decl);
  if (!snode
      || ((!snode->definition || DECL_EXTERNAL (decl))
	  && (!snode->in_other_partition
	      || (!snode->forced_by_abi && !snode->force_output))))
    return false;
  node = dyn_cast <cgraph_node *> (snode);
  return !node || !node->global.inlined_to;
}

/* Create a temporary for TYPE for a statement STMT.  If the current function
   is in SSA form, a SSA name is created.  Otherwise a temporary register
   is made.  */

static tree
create_tmp_reg_or_ssa_name (tree type, gimple *stmt = NULL)
{
  if (gimple_in_ssa_p (cfun))
    return make_ssa_name (type, stmt);
  else
    return create_tmp_reg (type);
}

/* CVAL is value taken from DECL_INITIAL of variable.  Try to transform it into
   acceptable form for is_gimple_min_invariant.
   FROM_DECL (if non-NULL) specify variable whose constructor contains CVAL.  */

tree
canonicalize_constructor_val (tree cval, tree from_decl)
{
  tree orig_cval = cval;
  STRIP_NOPS (cval);
  if (TREE_CODE (cval) == POINTER_PLUS_EXPR
      && TREE_CODE (TREE_OPERAND (cval, 1)) == INTEGER_CST)
    {
      tree ptr = TREE_OPERAND (cval, 0);
      if (is_gimple_min_invariant (ptr))
	cval = build1_loc (EXPR_LOCATION (cval),
			   ADDR_EXPR, TREE_TYPE (ptr),
			   fold_build2 (MEM_REF, TREE_TYPE (TREE_TYPE (ptr)),
					ptr,
					fold_convert (ptr_type_node,
						      TREE_OPERAND (cval, 1))));
    }
  if (TREE_CODE (cval) == ADDR_EXPR)
    {
      tree base = NULL_TREE;
      if (TREE_CODE (TREE_OPERAND (cval, 0)) == COMPOUND_LITERAL_EXPR)
	{
	  base = COMPOUND_LITERAL_EXPR_DECL (TREE_OPERAND (cval, 0));
	  if (base)
	    TREE_OPERAND (cval, 0) = base;
	}
      else
	base = get_base_address (TREE_OPERAND (cval, 0));
      if (!base)
	return NULL_TREE;

      if (VAR_OR_FUNCTION_DECL_P (base)
	  && !can_refer_decl_in_current_unit_p (base, from_decl))
	return NULL_TREE;
      if (TREE_TYPE (base) == error_mark_node)
	return NULL_TREE;
      if (VAR_P (base))
	TREE_ADDRESSABLE (base) = 1;
      else if (TREE_CODE (base) == FUNCTION_DECL)
	{
	  /* Make sure we create a cgraph node for functions we'll reference.
	     They can be non-existent if the reference comes from an entry
	     of an external vtable for example.  */
	  cgraph_node::get_create (base);
	}
      /* Fixup types in global initializers.  */
      if (TREE_TYPE (TREE_TYPE (cval)) != TREE_TYPE (TREE_OPERAND (cval, 0)))
	cval = build_fold_addr_expr (TREE_OPERAND (cval, 0));

      if (!useless_type_conversion_p (TREE_TYPE (orig_cval), TREE_TYPE (cval)))
	cval = fold_convert (TREE_TYPE (orig_cval), cval);
      return cval;
    }
  if (TREE_OVERFLOW_P (cval))
    return drop_tree_overflow (cval);
  return orig_cval;
}

/* If SYM is a constant variable with known value, return the value.
   NULL_TREE is returned otherwise.  */

tree
get_symbol_constant_value (tree sym)
{
  tree val = ctor_for_folding (sym);
  if (val != error_mark_node)
    {
      if (val)
	{
	  val = canonicalize_constructor_val (unshare_expr (val), sym);
	  if (val && is_gimple_min_invariant (val))
	    return val;
	  else
	    return NULL_TREE;
	}
      /* Variables declared 'const' without an initializer
	 have zero as the initializer if they may not be
	 overridden at link or run time.  */
      if (!val
          && is_gimple_reg_type (TREE_TYPE (sym)))
	return build_zero_cst (TREE_TYPE (sym));
    }

  return NULL_TREE;
}



/* Subroutine of fold_stmt.  We perform several simplifications of the
   memory reference tree EXPR and make sure to re-gimplify them properly
   after propagation of constant addresses.  IS_LHS is true if the
   reference is supposed to be an lvalue.  */

static tree
maybe_fold_reference (tree expr, bool is_lhs)
{
  tree result;

  if ((TREE_CODE (expr) == VIEW_CONVERT_EXPR
       || TREE_CODE (expr) == REALPART_EXPR
       || TREE_CODE (expr) == IMAGPART_EXPR)
      && CONSTANT_CLASS_P (TREE_OPERAND (expr, 0)))
    return fold_unary_loc (EXPR_LOCATION (expr),
			   TREE_CODE (expr),
			   TREE_TYPE (expr),
			   TREE_OPERAND (expr, 0));
  else if (TREE_CODE (expr) == BIT_FIELD_REF
	   && CONSTANT_CLASS_P (TREE_OPERAND (expr, 0)))
    return fold_ternary_loc (EXPR_LOCATION (expr),
			     TREE_CODE (expr),
			     TREE_TYPE (expr),
			     TREE_OPERAND (expr, 0),
			     TREE_OPERAND (expr, 1),
			     TREE_OPERAND (expr, 2));

  if (!is_lhs
      && (result = fold_const_aggregate_ref (expr))
      && is_gimple_min_invariant (result))
    return result;

  return NULL_TREE;
}


/* Attempt to fold an assignment statement pointed-to by SI.  Returns a
   replacement rhs for the statement or NULL_TREE if no simplification
   could be made.  It is assumed that the operands have been previously
   folded.  */

static tree
fold_gimple_assign (gimple_stmt_iterator *si)
{
  gimple *stmt = gsi_stmt (*si);
  enum tree_code subcode = gimple_assign_rhs_code (stmt);
  location_t loc = gimple_location (stmt);

  tree result = NULL_TREE;

  switch (get_gimple_rhs_class (subcode))
    {
    case GIMPLE_SINGLE_RHS:
      {
        tree rhs = gimple_assign_rhs1 (stmt);

	if (TREE_CLOBBER_P (rhs))
	  return NULL_TREE;

	if (REFERENCE_CLASS_P (rhs))
	  return maybe_fold_reference (rhs, false);

	else if (TREE_CODE (rhs) == OBJ_TYPE_REF)
	  {
	    tree val = OBJ_TYPE_REF_EXPR (rhs);
	    if (is_gimple_min_invariant (val))
	      return val;
	    else if (flag_devirtualize && virtual_method_call_p (rhs))
	      {
		bool final;
		vec <cgraph_node *>targets
		  = possible_polymorphic_call_targets (rhs, stmt, &final);
		if (final && targets.length () <= 1 && dbg_cnt (devirt))
		  {
		    if (dump_enabled_p ())
		      {
			location_t loc = gimple_location_safe (stmt);
			dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, loc,
					 "resolving virtual function address "
					 "reference to function %s\n",
					 targets.length () == 1
					 ? targets[0]->name ()
					 : "NULL");
		      }
		    if (targets.length () == 1)
		      {
			val = fold_convert (TREE_TYPE (val),
					    build_fold_addr_expr_loc
					      (loc, targets[0]->decl));
			STRIP_USELESS_TYPE_CONVERSION (val);
		      }
		    else
		      /* We can not use __builtin_unreachable here because it
			 can not have address taken.  */
		      val = build_int_cst (TREE_TYPE (val), 0);
		    return val;
		  }
	      }
	  }

	else if (TREE_CODE (rhs) == ADDR_EXPR)
	  {
	    tree ref = TREE_OPERAND (rhs, 0);
	    tree tem = maybe_fold_reference (ref, true);
	    if (tem
		&& TREE_CODE (tem) == MEM_REF
		&& integer_zerop (TREE_OPERAND (tem, 1)))
	      result = fold_convert (TREE_TYPE (rhs), TREE_OPERAND (tem, 0));
	    else if (tem)
	      result = fold_convert (TREE_TYPE (rhs),
				     build_fold_addr_expr_loc (loc, tem));
	    else if (TREE_CODE (ref) == MEM_REF
		     && integer_zerop (TREE_OPERAND (ref, 1)))
	      result = fold_convert (TREE_TYPE (rhs), TREE_OPERAND (ref, 0));

	    if (result)
	      {
		/* Strip away useless type conversions.  Both the
		   NON_LVALUE_EXPR that may have been added by fold, and
		   "useless" type conversions that might now be apparent
		   due to propagation.  */
		STRIP_USELESS_TYPE_CONVERSION (result);

		if (result != rhs && valid_gimple_rhs_p (result))
		  return result;
	      }
	  }

	else if (TREE_CODE (rhs) == CONSTRUCTOR
		 && TREE_CODE (TREE_TYPE (rhs)) == VECTOR_TYPE)
	  {
	    /* Fold a constant vector CONSTRUCTOR to VECTOR_CST.  */
	    unsigned i;
	    tree val;

	    FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (rhs), i, val)
	      if (! CONSTANT_CLASS_P (val))
		return NULL_TREE;

	    return build_vector_from_ctor (TREE_TYPE (rhs),
					   CONSTRUCTOR_ELTS (rhs));
	  }

	else if (DECL_P (rhs))
	  return get_symbol_constant_value (rhs);
      }
      break;

    case GIMPLE_UNARY_RHS:
      break;

    case GIMPLE_BINARY_RHS:
      break;

    case GIMPLE_TERNARY_RHS:
      result = fold_ternary_loc (loc, subcode,
				 TREE_TYPE (gimple_assign_lhs (stmt)),
				 gimple_assign_rhs1 (stmt),
				 gimple_assign_rhs2 (stmt),
				 gimple_assign_rhs3 (stmt));

      if (result)
        {
          STRIP_USELESS_TYPE_CONVERSION (result);
          if (valid_gimple_rhs_p (result))
	    return result;
        }
      break;

    case GIMPLE_INVALID_RHS:
      gcc_unreachable ();
    }

  return NULL_TREE;
}


/* Replace a statement at *SI_P with a sequence of statements in STMTS,
   adjusting the replacement stmts location and virtual operands.
   If the statement has a lhs the last stmt in the sequence is expected
   to assign to that lhs.  */

static void
gsi_replace_with_seq_vops (gimple_stmt_iterator *si_p, gimple_seq stmts)
{
  gimple *stmt = gsi_stmt (*si_p);

  if (gimple_has_location (stmt))
    annotate_all_with_location (stmts, gimple_location (stmt));

  /* First iterate over the replacement statements backward, assigning
     virtual operands to their defining statements.  */
  gimple *laststore = NULL;
  for (gimple_stmt_iterator i = gsi_last (stmts);
       !gsi_end_p (i); gsi_prev (&i))
    {
      gimple *new_stmt = gsi_stmt (i);
      if ((gimple_assign_single_p (new_stmt)
	   && !is_gimple_reg (gimple_assign_lhs (new_stmt)))
	  || (is_gimple_call (new_stmt)
	      && (gimple_call_flags (new_stmt)
		  & (ECF_NOVOPS | ECF_PURE | ECF_CONST | ECF_NORETURN)) == 0))
	{
	  tree vdef;
	  if (!laststore)
	    vdef = gimple_vdef (stmt);
	  else
	    vdef = make_ssa_name (gimple_vop (cfun), new_stmt);
	  gimple_set_vdef (new_stmt, vdef);
	  if (vdef && TREE_CODE (vdef) == SSA_NAME)
	    SSA_NAME_DEF_STMT (vdef) = new_stmt;
	  laststore = new_stmt;
	}
    }

  /* Second iterate over the statements forward, assigning virtual
     operands to their uses.  */
  tree reaching_vuse = gimple_vuse (stmt);
  for (gimple_stmt_iterator i = gsi_start (stmts);
       !gsi_end_p (i); gsi_next (&i))
    {
      gimple *new_stmt = gsi_stmt (i);
      /* If the new statement possibly has a VUSE, update it with exact SSA
	 name we know will reach this one.  */
      if (gimple_has_mem_ops (new_stmt))
	gimple_set_vuse (new_stmt, reaching_vuse);
      gimple_set_modified (new_stmt, true);
      if (gimple_vdef (new_stmt))
	reaching_vuse = gimple_vdef (new_stmt);
    }

  /* If the new sequence does not do a store release the virtual
     definition of the original statement.  */
  if (reaching_vuse
      && reaching_vuse == gimple_vuse (stmt))
    {
      tree vdef = gimple_vdef (stmt);
      if (vdef
	  && TREE_CODE (vdef) == SSA_NAME)
	{
	  unlink_stmt_vdef (stmt);
	  release_ssa_name (vdef);
	}
    }

  /* Finally replace the original statement with the sequence.  */
  gsi_replace_with_seq (si_p, stmts, false);
}

/* Convert EXPR into a GIMPLE value suitable for substitution on the
   RHS of an assignment.  Insert the necessary statements before
   iterator *SI_P.  The statement at *SI_P, which must be a GIMPLE_CALL
   is replaced.  If the call is expected to produces a result, then it
   is replaced by an assignment of the new RHS to the result variable.
   If the result is to be ignored, then the call is replaced by a
   GIMPLE_NOP.  A proper VDEF chain is retained by making the first
   VUSE and the last VDEF of the whole sequence be the same as the replaced
   statement and using new SSA names for stores in between.  */

void
gimplify_and_update_call_from_tree (gimple_stmt_iterator *si_p, tree expr)
{
  tree lhs;
  gimple *stmt, *new_stmt;
  gimple_stmt_iterator i;
  gimple_seq stmts = NULL;

  stmt = gsi_stmt (*si_p);

  gcc_assert (is_gimple_call (stmt));

  push_gimplify_context (gimple_in_ssa_p (cfun));

  lhs = gimple_call_lhs (stmt);
  if (lhs == NULL_TREE)
    {
      gimplify_and_add (expr, &stmts);
      /* We can end up with folding a memcpy of an empty class assignment
	 which gets optimized away by C++ gimplification.  */
      if (gimple_seq_empty_p (stmts))
	{
	  pop_gimplify_context (NULL);
	  if (gimple_in_ssa_p (cfun))
	    {
	      unlink_stmt_vdef (stmt);
	      release_defs (stmt);
	    }
	  gsi_replace (si_p, gimple_build_nop (), false);
	  return;
	}
    }
  else
    {
      tree tmp = force_gimple_operand (expr, &stmts, false, NULL_TREE);
      new_stmt = gimple_build_assign (lhs, tmp);
      i = gsi_last (stmts);
      gsi_insert_after_without_update (&i, new_stmt,
				       GSI_CONTINUE_LINKING);
    }

  pop_gimplify_context (NULL);

  gsi_replace_with_seq_vops (si_p, stmts);
}


/* Replace the call at *GSI with the gimple value VAL.  */

static void
replace_call_with_value (gimple_stmt_iterator *gsi, tree val)
{
  gimple *stmt = gsi_stmt (*gsi);
  tree lhs = gimple_call_lhs (stmt);
  gimple *repl;
  if (lhs)
    {
      if (!useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (val)))
	val = fold_convert (TREE_TYPE (lhs), val);
      repl = gimple_build_assign (lhs, val);
    }
  else
    repl = gimple_build_nop ();
  tree vdef = gimple_vdef (stmt);
  if (vdef && TREE_CODE (vdef) == SSA_NAME)
    {
      unlink_stmt_vdef (stmt);
      release_ssa_name (vdef);
    }
  gsi_replace (gsi, repl, false);
}

/* Replace the call at *GSI with the new call REPL and fold that
   again.  */

static void
replace_call_with_call_and_fold (gimple_stmt_iterator *gsi, gimple *repl)
{
  gimple *stmt = gsi_stmt (*gsi);
  gimple_call_set_lhs (repl, gimple_call_lhs (stmt));
  gimple_set_location (repl, gimple_location (stmt));
  if (gimple_vdef (stmt)
      && TREE_CODE (gimple_vdef (stmt)) == SSA_NAME)
    {
      gimple_set_vdef (repl, gimple_vdef (stmt));
      gimple_set_vuse (repl, gimple_vuse (stmt));
      SSA_NAME_DEF_STMT (gimple_vdef (repl)) = repl;
    }
  gsi_replace (gsi, repl, false);
  fold_stmt (gsi);
}

/* Return true if VAR is a VAR_DECL or a component thereof.  */

static bool
var_decl_component_p (tree var)
{
  tree inner = var;
  while (handled_component_p (inner))
    inner = TREE_OPERAND (inner, 0);
  return SSA_VAR_P (inner);
}

/* Fold function call to builtin mem{{,p}cpy,move}.  Return
   false if no simplification can be made.
   If ENDP is 0, return DEST (like memcpy).
   If ENDP is 1, return DEST+LEN (like mempcpy).
   If ENDP is 2, return DEST+LEN-1 (like stpcpy).
   If ENDP is 3, return DEST, additionally *SRC and *DEST may overlap
   (memmove).   */

static bool
gimple_fold_builtin_memory_op (gimple_stmt_iterator *gsi,
			       tree dest, tree src, int endp)
{
  gimple *stmt = gsi_stmt (*gsi);
  tree lhs = gimple_call_lhs (stmt);
  tree len = gimple_call_arg (stmt, 2);
  tree destvar, srcvar;
  location_t loc = gimple_location (stmt);

  /* If the LEN parameter is zero, return DEST.  */
  if (integer_zerop (len))
    {
      gimple *repl;
      if (gimple_call_lhs (stmt))
	repl = gimple_build_assign (gimple_call_lhs (stmt), dest);
      else
	repl = gimple_build_nop ();
      tree vdef = gimple_vdef (stmt);
      if (vdef && TREE_CODE (vdef) == SSA_NAME)
	{
	  unlink_stmt_vdef (stmt);
	  release_ssa_name (vdef);
	}
      gsi_replace (gsi, repl, false);
      return true;
    }

  /* If SRC and DEST are the same (and not volatile), return
     DEST{,+LEN,+LEN-1}.  */
  if (operand_equal_p (src, dest, 0))
    {
      unlink_stmt_vdef (stmt);
      if (gimple_vdef (stmt) && TREE_CODE (gimple_vdef (stmt)) == SSA_NAME)
	release_ssa_name (gimple_vdef (stmt));
      if (!lhs)
	{
	  gsi_replace (gsi, gimple_build_nop (), false);
	  return true;
	}
      goto done;
    }
  else
    {
      tree srctype, desttype;
      unsigned int src_align, dest_align;
      tree off0;

      /* Inlining of memcpy/memmove may cause bounds lost (if we copy
	 pointers as wide integer) and also may result in huge function
	 size because of inlined bounds copy.  Thus don't inline for
	 functions we want to instrument.  */
      if (flag_check_pointer_bounds
	  && chkp_instrumentable_p (cfun->decl)
	  /* Even if data may contain pointers we can inline if copy
	     less than a pointer size.  */
	  && (!tree_fits_uhwi_p (len)
	      || compare_tree_int (len, POINTER_SIZE_UNITS) >= 0))
	return false;

      /* Build accesses at offset zero with a ref-all character type.  */
      off0 = build_int_cst (build_pointer_type_for_mode (char_type_node,
							 ptr_mode, true), 0);

      /* If we can perform the copy efficiently with first doing all loads
         and then all stores inline it that way.  Currently efficiently
	 means that we can load all the memory into a single integer
	 register which is what MOVE_MAX gives us.  */
      src_align = get_pointer_alignment (src);
      dest_align = get_pointer_alignment (dest);
      if (tree_fits_uhwi_p (len)
	  && compare_tree_int (len, MOVE_MAX) <= 0
	  /* ???  Don't transform copies from strings with known length this
	     confuses the tree-ssa-strlen.c.  This doesn't handle
	     the case in gcc.dg/strlenopt-8.c which is XFAILed for that
	     reason.  */
	  && !c_strlen (src, 2))
	{
	  unsigned ilen = tree_to_uhwi (len);
	  if (pow2p_hwi (ilen))
	    {
	      tree type = lang_hooks.types.type_for_size (ilen * 8, 1);
	      if (type
		  && TYPE_MODE (type) != BLKmode
		  && (GET_MODE_SIZE (TYPE_MODE (type)) * BITS_PER_UNIT
		      == ilen * 8)
		  /* If the destination pointer is not aligned we must be able
		     to emit an unaligned store.  */
		  && (dest_align >= GET_MODE_ALIGNMENT (TYPE_MODE (type))
		      || !SLOW_UNALIGNED_ACCESS (TYPE_MODE (type), dest_align)
		      || (optab_handler (movmisalign_optab, TYPE_MODE (type))
			  != CODE_FOR_nothing)))
		{
		  tree srctype = type;
		  tree desttype = type;
		  if (src_align < GET_MODE_ALIGNMENT (TYPE_MODE (type)))
		    srctype = build_aligned_type (type, src_align);
		  tree srcmem = fold_build2 (MEM_REF, srctype, src, off0);
		  tree tem = fold_const_aggregate_ref (srcmem);
		  if (tem)
		    srcmem = tem;
		  else if (src_align < GET_MODE_ALIGNMENT (TYPE_MODE (type))
			   && SLOW_UNALIGNED_ACCESS (TYPE_MODE (type),
						     src_align)
			   && (optab_handler (movmisalign_optab,
					      TYPE_MODE (type))
			       == CODE_FOR_nothing))
		    srcmem = NULL_TREE;
		  if (srcmem)
		    {
		      gimple *new_stmt;
		      if (is_gimple_reg_type (TREE_TYPE (srcmem)))
			{
			  new_stmt = gimple_build_assign (NULL_TREE, srcmem);
			  srcmem
			    = create_tmp_reg_or_ssa_name (TREE_TYPE (srcmem),
							  new_stmt);
			  gimple_assign_set_lhs (new_stmt, srcmem);
			  gimple_set_vuse (new_stmt, gimple_vuse (stmt));
			  gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT);
			}
		      if (dest_align < GET_MODE_ALIGNMENT (TYPE_MODE (type)))
			desttype = build_aligned_type (type, dest_align);
		      new_stmt
			= gimple_build_assign (fold_build2 (MEM_REF, desttype,
							    dest, off0),
					       srcmem);
		      gimple_set_vuse (new_stmt, gimple_vuse (stmt));
		      gimple_set_vdef (new_stmt, gimple_vdef (stmt));
		      if (gimple_vdef (new_stmt)
			  && TREE_CODE (gimple_vdef (new_stmt)) == SSA_NAME)
			SSA_NAME_DEF_STMT (gimple_vdef (new_stmt)) = new_stmt;
		      if (!lhs)
			{
			  gsi_replace (gsi, new_stmt, false);
			  return true;
			}
		      gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT);
		      goto done;
		    }
		}
	    }
	}

      if (endp == 3)
	{
	  /* Both DEST and SRC must be pointer types.
	     ??? This is what old code did.  Is the testing for pointer types
	     really mandatory?

	     If either SRC is readonly or length is 1, we can use memcpy.  */
	  if (!dest_align || !src_align)
	    return false;
	  if (readonly_data_expr (src)
	      || (tree_fits_uhwi_p (len)
		  && (MIN (src_align, dest_align) / BITS_PER_UNIT
		      >= tree_to_uhwi (len))))
	    {
	      tree fn = builtin_decl_implicit (BUILT_IN_MEMCPY);
	      if (!fn)
		return false;
	      gimple_call_set_fndecl (stmt, fn);
	      gimple_call_set_arg (stmt, 0, dest);
	      gimple_call_set_arg (stmt, 1, src);
	      fold_stmt (gsi);
	      return true;
	    }

	  /* If *src and *dest can't overlap, optimize into memcpy as well.  */
	  if (TREE_CODE (src) == ADDR_EXPR
	      && TREE_CODE (dest) == ADDR_EXPR)
	    {
	      tree src_base, dest_base, fn;
	      HOST_WIDE_INT src_offset = 0, dest_offset = 0;
	      HOST_WIDE_INT maxsize;

	      srcvar = TREE_OPERAND (src, 0);
	      src_base = get_addr_base_and_unit_offset (srcvar, &src_offset);
	      if (src_base == NULL)
		src_base = srcvar;
	      destvar = TREE_OPERAND (dest, 0);
	      dest_base = get_addr_base_and_unit_offset (destvar,
							 &dest_offset);
	      if (dest_base == NULL)
		dest_base = destvar;
	      if (tree_fits_uhwi_p (len))
		maxsize = tree_to_uhwi (len);
	      else
		maxsize = -1;
	      if (SSA_VAR_P (src_base)
		  && SSA_VAR_P (dest_base))
		{
		  if (operand_equal_p (src_base, dest_base, 0)
		      && ranges_overlap_p (src_offset, maxsize,
					   dest_offset, maxsize))
		    return false;
		}
	      else if (TREE_CODE (src_base) == MEM_REF
		       && TREE_CODE (dest_base) == MEM_REF)
		{
		  if (! operand_equal_p (TREE_OPERAND (src_base, 0),
					 TREE_OPERAND (dest_base, 0), 0))
		    return false;
		  offset_int off = mem_ref_offset (src_base) + src_offset;
		  if (!wi::fits_shwi_p (off))
		    return false;
		  src_offset = off.to_shwi ();

		  off = mem_ref_offset (dest_base) + dest_offset;
		  if (!wi::fits_shwi_p (off))
		    return false;
		  dest_offset = off.to_shwi ();
		  if (ranges_overlap_p (src_offset, maxsize,
					dest_offset, maxsize))
		    return false;
		}
	      else
		return false;

	      fn = builtin_decl_implicit (BUILT_IN_MEMCPY);
	      if (!fn)
		return false;
	      gimple_call_set_fndecl (stmt, fn);
	      gimple_call_set_arg (stmt, 0, dest);
	      gimple_call_set_arg (stmt, 1, src);
	      fold_stmt (gsi);
	      return true;
	    }

	  /* If the destination and source do not alias optimize into
	     memcpy as well.  */
	  if ((is_gimple_min_invariant (dest)
	       || TREE_CODE (dest) == SSA_NAME)
	      && (is_gimple_min_invariant (src)
		  || TREE_CODE (src) == SSA_NAME))
	    {
	      ao_ref destr, srcr;
	      ao_ref_init_from_ptr_and_size (&destr, dest, len);
	      ao_ref_init_from_ptr_and_size (&srcr, src, len);
	      if (!refs_may_alias_p_1 (&destr, &srcr, false))
		{
		  tree fn;
		  fn = builtin_decl_implicit (BUILT_IN_MEMCPY);
		  if (!fn)
		    return false;
		  gimple_call_set_fndecl (stmt, fn);
		  gimple_call_set_arg (stmt, 0, dest);
		  gimple_call_set_arg (stmt, 1, src);
		  fold_stmt (gsi);
		  return true;
		}
	    }

	  return false;
	}

      if (!tree_fits_shwi_p (len))
	return false;
      /* FIXME:
         This logic lose for arguments like (type *)malloc (sizeof (type)),
         since we strip the casts of up to VOID return value from malloc.
	 Perhaps we ought to inherit type from non-VOID argument here?  */
      STRIP_NOPS (src);
      STRIP_NOPS (dest);
      if (!POINTER_TYPE_P (TREE_TYPE (src))
	  || !POINTER_TYPE_P (TREE_TYPE (dest)))
	return false;
      /* In the following try to find a type that is most natural to be
	 used for the memcpy source and destination and that allows
	 the most optimization when memcpy is turned into a plain assignment
	 using that type.  In theory we could always use a char[len] type
	 but that only gains us that the destination and source possibly
	 no longer will have their address taken.  */
      /* As we fold (void *)(p + CST) to (void *)p + CST undo this here.  */
      if (TREE_CODE (src) == POINTER_PLUS_EXPR)
	{
	  tree tem = TREE_OPERAND (src, 0);
	  STRIP_NOPS (tem);
	  if (tem != TREE_OPERAND (src, 0))
	    src = build1 (NOP_EXPR, TREE_TYPE (tem), src);
	}
      if (TREE_CODE (dest) == POINTER_PLUS_EXPR)
	{
	  tree tem = TREE_OPERAND (dest, 0);
	  STRIP_NOPS (tem);
	  if (tem != TREE_OPERAND (dest, 0))
	    dest = build1 (NOP_EXPR, TREE_TYPE (tem), dest);
	}
      srctype = TREE_TYPE (TREE_TYPE (src));
      if (TREE_CODE (srctype) == ARRAY_TYPE
	  && !tree_int_cst_equal (TYPE_SIZE_UNIT (srctype), len))
	{
	  srctype = TREE_TYPE (srctype);
	  STRIP_NOPS (src);
	  src = build1 (NOP_EXPR, build_pointer_type (srctype), src);
	}
      desttype = TREE_TYPE (TREE_TYPE (dest));
      if (TREE_CODE (desttype) == ARRAY_TYPE
	  && !tree_int_cst_equal (TYPE_SIZE_UNIT (desttype), len))
	{
	  desttype = TREE_TYPE (desttype);
	  STRIP_NOPS (dest);
	  dest = build1 (NOP_EXPR, build_pointer_type (desttype), dest);
	}
      if (TREE_ADDRESSABLE (srctype)
	  || TREE_ADDRESSABLE (desttype))
	return false;

      /* Make sure we are not copying using a floating-point mode or
         a type whose size possibly does not match its precision.  */
      if (FLOAT_MODE_P (TYPE_MODE (desttype))
	  || TREE_CODE (desttype) == BOOLEAN_TYPE
	  || TREE_CODE (desttype) == ENUMERAL_TYPE)
	desttype = bitwise_type_for_mode (TYPE_MODE (desttype));
      if (FLOAT_MODE_P (TYPE_MODE (srctype))
	  || TREE_CODE (srctype) == BOOLEAN_TYPE
	  || TREE_CODE (srctype) == ENUMERAL_TYPE)
	srctype = bitwise_type_for_mode (TYPE_MODE (srctype));
      if (!srctype)
	srctype = desttype;
      if (!desttype)
	desttype = srctype;
      if (!srctype)
	return false;

      src_align = get_pointer_alignment (src);
      dest_align = get_pointer_alignment (dest);
      if (dest_align < TYPE_ALIGN (desttype)
	  || src_align < TYPE_ALIGN (srctype))
	return false;

      destvar = dest;
      STRIP_NOPS (destvar);
      if (TREE_CODE (destvar) == ADDR_EXPR
	  && var_decl_component_p (TREE_OPERAND (destvar, 0))
	  && tree_int_cst_equal (TYPE_SIZE_UNIT (desttype), len))
	destvar = fold_build2 (MEM_REF, desttype, destvar, off0);
      else
	destvar = NULL_TREE;

      srcvar = src;
      STRIP_NOPS (srcvar);
      if (TREE_CODE (srcvar) == ADDR_EXPR
	  && var_decl_component_p (TREE_OPERAND (srcvar, 0))
	  && tree_int_cst_equal (TYPE_SIZE_UNIT (srctype), len))
	{
	  if (!destvar
	      || src_align >= TYPE_ALIGN (desttype))
	    srcvar = fold_build2 (MEM_REF, destvar ? desttype : srctype,
				  srcvar, off0);
	  else if (!STRICT_ALIGNMENT)
	    {
	      srctype = build_aligned_type (TYPE_MAIN_VARIANT (desttype),
					    src_align);
	      srcvar = fold_build2 (MEM_REF, srctype, srcvar, off0);
	    }
	  else
	    srcvar = NULL_TREE;
	}
      else
	srcvar = NULL_TREE;

      if (srcvar == NULL_TREE && destvar == NULL_TREE)
	return false;

      if (srcvar == NULL_TREE)
	{
	  STRIP_NOPS (src);
	  if (src_align >= TYPE_ALIGN (desttype))
	    srcvar = fold_build2 (MEM_REF, desttype, src, off0);
	  else
	    {
	      if (STRICT_ALIGNMENT)
		return false;
	      srctype = build_aligned_type (TYPE_MAIN_VARIANT (desttype),
					    src_align);
	      srcvar = fold_build2 (MEM_REF, srctype, src, off0);
	    }
	}
      else if (destvar == NULL_TREE)
	{
	  STRIP_NOPS (dest);
	  if (dest_align >= TYPE_ALIGN (srctype))
	    destvar = fold_build2 (MEM_REF, srctype, dest, off0);
	  else
	    {
	      if (STRICT_ALIGNMENT)
		return false;
	      desttype = build_aligned_type (TYPE_MAIN_VARIANT (srctype),
					     dest_align);
	      destvar = fold_build2 (MEM_REF, desttype, dest, off0);
	    }
	}

      gimple *new_stmt;
      if (is_gimple_reg_type (TREE_TYPE (srcvar)))
	{
	  tree tem = fold_const_aggregate_ref (srcvar);
	  if (tem)
	    srcvar = tem;
	  if (! is_gimple_min_invariant (srcvar))
	    {
	      new_stmt = gimple_build_assign (NULL_TREE, srcvar);
	      srcvar = create_tmp_reg_or_ssa_name (TREE_TYPE (srcvar),
						   new_stmt);
	      gimple_assign_set_lhs (new_stmt, srcvar);
	      gimple_set_vuse (new_stmt, gimple_vuse (stmt));
	      gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT);
	    }
	}
      new_stmt = gimple_build_assign (destvar, srcvar);
      gimple_set_vuse (new_stmt, gimple_vuse (stmt));
      gimple_set_vdef (new_stmt, gimple_vdef (stmt));
      if (gimple_vdef (new_stmt)
	  && TREE_CODE (gimple_vdef (new_stmt)) == SSA_NAME)
	SSA_NAME_DEF_STMT (gimple_vdef (new_stmt)) = new_stmt;
      if (!lhs)
	{
	  gsi_replace (gsi, new_stmt, false);
	  return true;
	}
      gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT);
    }

done:
  gimple_seq stmts = NULL;
  if (endp == 0 || endp == 3)
    len = NULL_TREE;
  else if (endp == 2)
    len = gimple_build (&stmts, loc, MINUS_EXPR, TREE_TYPE (len), len,
			ssize_int (1));
  if (endp == 2 || endp == 1)
    {
      len = gimple_convert_to_ptrofftype (&stmts, loc, len);
      dest = gimple_build (&stmts, loc, POINTER_PLUS_EXPR,
			   TREE_TYPE (dest), dest, len);
    }

  gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT);
  gimple *repl = gimple_build_assign (lhs, dest);
  gsi_replace (gsi, repl, false);
  return true;
}

/* Fold function call to builtin memset or bzero at *GSI setting the
   memory of size LEN to VAL.  Return whether a simplification was made.  */

static bool
gimple_fold_builtin_memset (gimple_stmt_iterator *gsi, tree c, tree len)
{
  gimple *stmt = gsi_stmt (*gsi);
  tree etype;
  unsigned HOST_WIDE_INT length, cval;

  /* If the LEN parameter is zero, return DEST.  */
  if (integer_zerop (len))
    {
      replace_call_with_value (gsi, gimple_call_arg (stmt, 0));
      return true;
    }

  if (! tree_fits_uhwi_p (len))
    return false;

  if (TREE_CODE (c) != INTEGER_CST)
    return false;

  tree dest = gimple_call_arg (stmt, 0);
  tree var = dest;
  if (TREE_CODE (var) != ADDR_EXPR)
    return false;

  var = TREE_OPERAND (var, 0);
  if (TREE_THIS_VOLATILE (var))
    return false;

  etype = TREE_TYPE (var);
  if (TREE_CODE (etype) == ARRAY_TYPE)
    etype = TREE_TYPE (etype);

  if (!INTEGRAL_TYPE_P (etype)
      && !POINTER_TYPE_P (etype))
    return NULL_TREE;

  if (! var_decl_component_p (var))
    return NULL_TREE;

  length = tree_to_uhwi (len);
  if (GET_MODE_SIZE (TYPE_MODE (etype)) != length
      || get_pointer_alignment (dest) / BITS_PER_UNIT < length)
    return NULL_TREE;

  if (length > HOST_BITS_PER_WIDE_INT / BITS_PER_UNIT)
    return NULL_TREE;

  if (integer_zerop (c))
    cval = 0;
  else
    {
      if (CHAR_BIT != 8 || BITS_PER_UNIT != 8 || HOST_BITS_PER_WIDE_INT > 64)
	return NULL_TREE;

      cval = TREE_INT_CST_LOW (c);
      cval &= 0xff;
      cval |= cval << 8;
      cval |= cval << 16;
      cval |= (cval << 31) << 1;
    }

  var = fold_build2 (MEM_REF, etype, dest, build_int_cst (ptr_type_node, 0));
  gimple *store = gimple_build_assign (var, build_int_cst_type (etype, cval));
  gimple_set_vuse (store, gimple_vuse (stmt));
  tree vdef = gimple_vdef (stmt);
  if (vdef && TREE_CODE (vdef) == SSA_NAME)
    {
      gimple_set_vdef (store, gimple_vdef (stmt));
      SSA_NAME_DEF_STMT (gimple_vdef (stmt)) = store;
    }
  gsi_insert_before (gsi, store, GSI_SAME_STMT);
  if (gimple_call_lhs (stmt))
    {
      gimple *asgn = gimple_build_assign (gimple_call_lhs (stmt), dest);
      gsi_replace (gsi, asgn, false);
    }
  else
    {
      gimple_stmt_iterator gsi2 = *gsi;
      gsi_prev (gsi);
      gsi_remove (&gsi2, true);
    }

  return true;
}


/* Obtain the minimum and maximum string length or minimum and maximum
   value of ARG in LENGTH[0] and LENGTH[1], respectively.
   If ARG is an SSA name variable, follow its use-def chains.  When
   TYPE == 0, if LENGTH[1] is not equal to the length we determine or
   if we are unable to determine the length or value, return False.
   VISITED is a bitmap of visited variables.
   TYPE is 0 if string length should be obtained, 1 for maximum string
   length and 2 for maximum value ARG can have.
   When FUZZY is set and the length of a string cannot be determined,
   the function instead considers as the maximum possible length the
   size of a character array it may refer to.  */

static bool
get_range_strlen (tree arg, tree length[2], bitmap *visited, int type,
		  bool fuzzy)
{
  tree var, val;
  gimple *def_stmt;

  /* The minimum and maximum length.  The MAXLEN pointer stays unchanged
     but MINLEN may be cleared during the execution of the function.  */
  tree *minlen = length;
  tree *const maxlen = length + 1;

  if (TREE_CODE (arg) != SSA_NAME)
    {
      /* We can end up with &(*iftmp_1)[0] here as well, so handle it.  */
      if (TREE_CODE (arg) == ADDR_EXPR
	  && TREE_CODE (TREE_OPERAND (arg, 0)) == ARRAY_REF
	  && integer_zerop (TREE_OPERAND (TREE_OPERAND (arg, 0), 1)))
	{
	  tree aop0 = TREE_OPERAND (TREE_OPERAND (arg, 0), 0);
	  if (TREE_CODE (aop0) == INDIRECT_REF
	      && TREE_CODE (TREE_OPERAND (aop0, 0)) == SSA_NAME)
	    return get_range_strlen (TREE_OPERAND (aop0, 0),
				     length, visited, type, fuzzy);
	}

      if (type == 2)
	{
	  val = arg;
	  if (TREE_CODE (val) != INTEGER_CST
	      || tree_int_cst_sgn (val) < 0)
	    return false;
	}
      else
	val = c_strlen (arg, 1);

      if (!val && fuzzy)
	{
	  if (TREE_CODE (arg) == ADDR_EXPR)
	    return get_range_strlen (TREE_OPERAND (arg, 0), length,
				     visited, type, fuzzy);

	  if (TREE_CODE (arg) == COMPONENT_REF
	      && TREE_CODE (TREE_TYPE (TREE_OPERAND (arg, 1))) == ARRAY_TYPE)
	    {
	      /* Use the type of the member array to determine the upper
		 bound on the length of the array.  This may be overly
		 optimistic if the array itself isn't NUL-terminated and
		 the caller relies on the subsequent member to contain
		 the NUL.  */
	      arg = TREE_OPERAND (arg, 1);
	      val = TYPE_SIZE_UNIT (TREE_TYPE (arg));
	      if (!val || integer_zerop (val))
		return false;
	      val = fold_build2 (MINUS_EXPR, TREE_TYPE (val), val,
				 integer_one_node);
	      /* Avoid using the array size as the minimum.  */
	      minlen = NULL;
	    }
	}

      if (!val)
	return false;

      if (minlen
	  && (!*minlen
	      || (type > 0
		  && TREE_CODE (*minlen) == INTEGER_CST
		  && TREE_CODE (val) == INTEGER_CST
		  && tree_int_cst_lt (val, *minlen))))
	*minlen = val;

      if (*maxlen)
	{
	  if (type > 0)
	    {
	      if (TREE_CODE (*maxlen) != INTEGER_CST
		  || TREE_CODE (val) != INTEGER_CST)
		return false;

	      if (tree_int_cst_lt (*maxlen, val))
		*maxlen = val;
	      return true;
	    }
	  else if (simple_cst_equal (val, *maxlen) != 1)
	    return false;
	}

      *maxlen = val;
      return true;
    }

  /* If ARG is registered for SSA update we cannot look at its defining
     statement.  */
  if (name_registered_for_update_p (arg))
    return false;

  /* If we were already here, break the infinite cycle.  */
  if (!*visited)
    *visited = BITMAP_ALLOC (NULL);
  if (!bitmap_set_bit (*visited, SSA_NAME_VERSION (arg)))
    return true;

  var = arg;
  def_stmt = SSA_NAME_DEF_STMT (var);

  switch (gimple_code (def_stmt))
    {
      case GIMPLE_ASSIGN:
        /* The RHS of the statement defining VAR must either have a
           constant length or come from another SSA_NAME with a constant
           length.  */
        if (gimple_assign_single_p (def_stmt)
            || gimple_assign_unary_nop_p (def_stmt))
          {
            tree rhs = gimple_assign_rhs1 (def_stmt);
	    return get_range_strlen (rhs, length, visited, type, fuzzy);
          }
	else if (gimple_assign_rhs_code (def_stmt) == COND_EXPR)
	  {
	    tree op2 = gimple_assign_rhs2 (def_stmt);
	    tree op3 = gimple_assign_rhs3 (def_stmt);
	    return get_range_strlen (op2, length, visited, type, fuzzy)
	      && get_range_strlen (op3, length, visited, type, fuzzy);
          }
        return false;

      case GIMPLE_PHI:
	{
	  /* All the arguments of the PHI node must have the same constant
	     length.  */
	  unsigned i;

	  for (i = 0; i < gimple_phi_num_args (def_stmt); i++)
          {
            tree arg = gimple_phi_arg (def_stmt, i)->def;

            /* If this PHI has itself as an argument, we cannot
               determine the string length of this argument.  However,
               if we can find a constant string length for the other
               PHI args then we can still be sure that this is a
               constant string length.  So be optimistic and just
               continue with the next argument.  */
            if (arg == gimple_phi_result (def_stmt))
              continue;

	    if (!get_range_strlen (arg, length, visited, type, fuzzy))
	      {
		if (fuzzy)
		  *maxlen = build_all_ones_cst (size_type_node);
		else
		  return false;
	      }
          }
        }
        return true;

      default:
        return false;
    }
}

/* Determine the minimum and maximum value or string length that ARG
   refers to and store each in the first two elements of MINMAXLEN.
   For expressions that point to strings of unknown lengths that are
   character arrays, use the upper bound of the array as the maximum
   length.  For example, given an expression like 'x ? array : "xyz"'
   and array declared as 'char array[8]', MINMAXLEN[0] will be set
   to 3 and MINMAXLEN[1] to 7, the longest string that could be
   stored in array.
*/

void get_range_strlen (tree arg, tree minmaxlen[2])
{
  bitmap visited = NULL;

  minmaxlen[0] = NULL_TREE;
  minmaxlen[1] = NULL_TREE;

  get_range_strlen (arg, minmaxlen, &visited, 1, true);

  if (visited)
    BITMAP_FREE (visited);
}

tree
get_maxval_strlen (tree arg, int type)
{
  bitmap visited = NULL;
  tree len[2] = { NULL_TREE, NULL_TREE };
  if (!get_range_strlen (arg, len, &visited, type, false))
    len[1] = NULL_TREE;
  if (visited)
    BITMAP_FREE (visited);

  return len[1];
}


/* Fold function call to builtin strcpy with arguments DEST and SRC.
   If LEN is not NULL, it represents the length of the string to be
   copied.  Return NULL_TREE if no simplification can be made.  */

static bool
gimple_fold_builtin_strcpy (gimple_stmt_iterator *gsi,
			    tree dest, tree src)
{
  location_t loc = gimple_location (gsi_stmt (*gsi));
  tree fn;

  /* If SRC and DEST are the same (and not volatile), return DEST.  */
  if (operand_equal_p (src, dest, 0))
    {
      replace_call_with_value (gsi, dest);
      return true;
    }

  if (optimize_function_for_size_p (cfun))
    return false;

  fn = builtin_decl_implicit (BUILT_IN_MEMCPY);
  if (!fn)
    return false;

  tree len = get_maxval_strlen (src, 0);
  if (!len)
    return false;

  len = fold_convert_loc (loc, size_type_node, len);
  len = size_binop_loc (loc, PLUS_EXPR, len, build_int_cst (size_type_node, 1));
  len = force_gimple_operand_gsi (gsi, len, true,
				  NULL_TREE, true, GSI_SAME_STMT);
  gimple *repl = gimple_build_call (fn, 3, dest, src, len);
  replace_call_with_call_and_fold (gsi, repl);
  return true;
}

/* Fold function call to builtin strncpy with arguments DEST, SRC, and LEN.
   If SLEN is not NULL, it represents the length of the source string.
   Return NULL_TREE if no simplification can be made.  */

static bool
gimple_fold_builtin_strncpy (gimple_stmt_iterator *gsi,
			     tree dest, tree src, tree len)
{
  location_t loc = gimple_location (gsi_stmt (*gsi));
  tree fn;

  /* If the LEN parameter is zero, return DEST.  */
  if (integer_zerop (len))
    {
      replace_call_with_value (gsi, dest);
      return true;
    }

  /* We can't compare slen with len as constants below if len is not a
     constant.  */
  if (TREE_CODE (len) != INTEGER_CST)
    return false;

  /* Now, we must be passed a constant src ptr parameter.  */
  tree slen = get_maxval_strlen (src, 0);
  if (!slen || TREE_CODE (slen) != INTEGER_CST)
    return false;

  slen = size_binop_loc (loc, PLUS_EXPR, slen, ssize_int (1));

  /* We do not support simplification of this case, though we do
     support it when expanding trees into RTL.  */
  /* FIXME: generate a call to __builtin_memset.  */
  if (tree_int_cst_lt (slen, len))
    return false;

  /* OK transform into builtin memcpy.  */
  fn = builtin_decl_implicit (BUILT_IN_MEMCPY);
  if (!fn)
    return false;

  len = fold_convert_loc (loc, size_type_node, len);
  len = force_gimple_operand_gsi (gsi, len, true,
				  NULL_TREE, true, GSI_SAME_STMT);
  gimple *repl = gimple_build_call (fn, 3, dest, src, len);
  replace_call_with_call_and_fold (gsi, repl);
  return true;
}

/* Fold function call to builtin strchr or strrchr.
   If both arguments are constant, evaluate and fold the result,
   otherwise simplify str(r)chr (str, 0) into str + strlen (str).
   In general strlen is significantly faster than strchr
   due to being a simpler operation.  */
static bool
gimple_fold_builtin_strchr (gimple_stmt_iterator *gsi, bool is_strrchr)
{
  gimple *stmt = gsi_stmt (*gsi);
  tree str = gimple_call_arg (stmt, 0);
  tree c = gimple_call_arg (stmt, 1);
  location_t loc = gimple_location (stmt);
  const char *p;
  char ch;

  if (!gimple_call_lhs (stmt))
    return false;

  if ((p = c_getstr (str)) && target_char_cst_p (c, &ch))
    {
      const char *p1 = is_strrchr ? strrchr (p, ch) : strchr (p, ch);

      if (p1 == NULL)
	{
	  replace_call_with_value (gsi, integer_zero_node);
	  return true;
	}

      tree len = build_int_cst (size_type_node, p1 - p);
      gimple_seq stmts = NULL;
      gimple *new_stmt = gimple_build_assign (gimple_call_lhs (stmt),
					      POINTER_PLUS_EXPR, str, len);
      gimple_seq_add_stmt_without_update (&stmts, new_stmt);
      gsi_replace_with_seq_vops (gsi, stmts);
      return true;
    }

  if (!integer_zerop (c))
    return false;

  /* Transform strrchr (s, 0) to strchr (s, 0) when optimizing for size.  */
  if (optimize_function_for_size_p (cfun))
    {
      tree strchr_fn = builtin_decl_implicit (BUILT_IN_STRCHR);

      if (is_strrchr && strchr_fn)
	{
	  gimple *repl = gimple_build_call (strchr_fn, 2, str, c);
	  replace_call_with_call_and_fold (gsi, repl);
	  return true;
	}

      return false;
    }

  tree len;
  tree strlen_fn = builtin_decl_implicit (BUILT_IN_STRLEN);

  if (!strlen_fn)
    return false;

  /* Create newstr = strlen (str).  */
  gimple_seq stmts = NULL;
  gimple *new_stmt = gimple_build_call (strlen_fn, 1, str);
  gimple_set_location (new_stmt, loc);
  len = create_tmp_reg_or_ssa_name (size_type_node);
  gimple_call_set_lhs (new_stmt, len);
  gimple_seq_add_stmt_without_update (&stmts, new_stmt);

  /* Create (str p+ strlen (str)).  */
  new_stmt = gimple_build_assign (gimple_call_lhs (stmt),
				  POINTER_PLUS_EXPR, str, len);
  gimple_seq_add_stmt_without_update (&stmts, new_stmt);
  gsi_replace_with_seq_vops (gsi, stmts);
  /* gsi now points at the assignment to the lhs, get a
     stmt iterator to the strlen.
     ???  We can't use gsi_for_stmt as that doesn't work when the
     CFG isn't built yet.  */
  gimple_stmt_iterator gsi2 = *gsi;
  gsi_prev (&gsi2);
  fold_stmt (&gsi2);
  return true;
}

/* Simplify a call to the strcat builtin.  DST and SRC are the arguments
   to the call.

   Return NULL_TREE if no simplification was possible, otherwise return the
   simplified form of the call as a tree.

   The simplified form may be a constant or other expression which
   computes the same value, but in a more efficient manner (including
   calls to other builtin functions).

   The call may contain arguments which need to be evaluated, but
   which are not useful to determine the result of the call.  In
   this case we return a chain of COMPOUND_EXPRs.  The LHS of each
   COMPOUND_EXPR will be an argument which must be evaluated.
   COMPOUND_EXPRs are chained through their RHS.  The RHS of the last
   COMPOUND_EXPR in the chain will contain the tree for the simplified
   form of the builtin function call.  */

static bool
gimple_fold_builtin_strcat (gimple_stmt_iterator *gsi, tree dst, tree src)
{
  gimple *stmt = gsi_stmt (*gsi);
  location_t loc = gimple_location (stmt);

  const char *p = c_getstr (src);

  /* If the string length is zero, return the dst parameter.  */
  if (p && *p == '\0')
    {
      replace_call_with_value (gsi, dst);
      return true;
    }

  if (!optimize_bb_for_speed_p (gimple_bb (stmt)))
    return false;

  /* See if we can store by pieces into (dst + strlen(dst)).  */
  tree newdst;
  tree strlen_fn = builtin_decl_implicit (BUILT_IN_STRLEN);
  tree memcpy_fn = builtin_decl_implicit (BUILT_IN_MEMCPY);

  if (!strlen_fn || !memcpy_fn)
    return false;

  /* If the length of the source string isn't computable don't
     split strcat into strlen and memcpy.  */
  tree len = get_maxval_strlen (src, 0);
  if (! len)
    return false;

  /* Create strlen (dst).  */
  gimple_seq stmts = NULL, stmts2;
  gimple *repl = gimple_build_call (strlen_fn, 1, dst);
  gimple_set_location (repl, loc);
  newdst = create_tmp_reg_or_ssa_name (size_type_node);
  gimple_call_set_lhs (repl, newdst);
  gimple_seq_add_stmt_without_update (&stmts, repl);

  /* Create (dst p+ strlen (dst)).  */
  newdst = fold_build_pointer_plus_loc (loc, dst, newdst);
  newdst = force_gimple_operand (newdst, &stmts2, true, NULL_TREE);
  gimple_seq_add_seq_without_update (&stmts, stmts2);

  len = fold_convert_loc (loc, size_type_node, len);
  len = size_binop_loc (loc, PLUS_EXPR, len,
			build_int_cst (size_type_node, 1));
  len = force_gimple_operand (len, &stmts2, true, NULL_TREE);
  gimple_seq_add_seq_without_update (&stmts, stmts2);

  repl = gimple_build_call (memcpy_fn, 3, newdst, src, len);
  gimple_seq_add_stmt_without_update (&stmts, repl);
  if (gimple_call_lhs (stmt))
    {
      repl = gimple_build_assign (gimple_call_lhs (stmt), dst);
      gimple_seq_add_stmt_without_update (&stmts, repl);
      gsi_replace_with_seq_vops (gsi, stmts);
      /* gsi now points at the assignment to the lhs, get a
         stmt iterator to the memcpy call.
	 ???  We can't use gsi_for_stmt as that doesn't work when the
	 CFG isn't built yet.  */
      gimple_stmt_iterator gsi2 = *gsi;
      gsi_prev (&gsi2);
      fold_stmt (&gsi2);
    }
  else
    {
      gsi_replace_with_seq_vops (gsi, stmts);
      fold_stmt (gsi);
    }
  return true;
}

/* Fold a call to the __strcat_chk builtin FNDECL.  DEST, SRC, and SIZE
   are the arguments to the call.  */

static bool
gimple_fold_builtin_strcat_chk (gimple_stmt_iterator *gsi)
{
  gimple *stmt = gsi_stmt (*gsi);
  tree dest = gimple_call_arg (stmt, 0);
  tree src = gimple_call_arg (stmt, 1);
  tree size = gimple_call_arg (stmt, 2);
  tree fn;
  const char *p;


  p = c_getstr (src);
  /* If the SRC parameter is "", return DEST.  */
  if (p && *p == '\0')
    {
      replace_call_with_value (gsi, dest);
      return true;
    }

  if (! tree_fits_uhwi_p (size) || ! integer_all_onesp (size))
    return false;

  /* If __builtin_strcat_chk is used, assume strcat is available.  */
  fn = builtin_decl_explicit (BUILT_IN_STRCAT);
  if (!fn)
    return false;

  gimple *repl = gimple_build_call (fn, 2, dest, src);
  replace_call_with_call_and_fold (gsi, repl);
  return true;
}

/* Simplify a call to the strncat builtin.  */

static bool
gimple_fold_builtin_strncat (gimple_stmt_iterator *gsi)
{
  gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi));
  tree dst = gimple_call_arg (stmt, 0);
  tree src = gimple_call_arg (stmt, 1);
  tree len = gimple_call_arg (stmt, 2);

  const char *p = c_getstr (src);

  /* If the requested length is zero, or the src parameter string
     length is zero, return the dst parameter.  */
  if (integer_zerop (len) || (p && *p == '\0'))
    {
      replace_call_with_value (gsi, dst);
      return true;
    }

  /* If the requested len is greater than or equal to the string
     length, call strcat.  */
  if (TREE_CODE (len) == INTEGER_CST && p
      && compare_tree_int (len, strlen (p)) >= 0)
    {
      tree fn = builtin_decl_implicit (BUILT_IN_STRCAT);

      /* If the replacement _DECL isn't initialized, don't do the
	 transformation.  */
      if (!fn)
	return false;

      gcall *repl = gimple_build_call (fn, 2, dst, src);
      replace_call_with_call_and_fold (gsi, repl);
      return true;
    }

  return false;
}

/* Fold a call to the __strncat_chk builtin with arguments DEST, SRC,
   LEN, and SIZE.  */

static bool 
gimple_fold_builtin_strncat_chk (gimple_stmt_iterator *gsi)
{
  gimple *stmt = gsi_stmt (*gsi);
  tree dest = gimple_call_arg (stmt, 0);
  tree src = gimple_call_arg (stmt, 1);
  tree len = gimple_call_arg (stmt, 2);
  tree size = gimple_call_arg (stmt, 3);
  tree fn;
  const char *p;

  p = c_getstr (src);
  /* If the SRC parameter is "" or if LEN is 0, return DEST.  */
  if ((p && *p == '\0')
      || integer_zerop (len))
    {
      replace_call_with_value (gsi, dest);
      return true;
    }

  if (! tree_fits_uhwi_p (size))
    return false;

  if (! integer_all_onesp (size))
    {
      tree src_len = c_strlen (src, 1);
      if (src_len
	  && tree_fits_uhwi_p (src_len)
	  && tree_fits_uhwi_p (len)
	  && ! tree_int_cst_lt (len, src_len))
	{
	  /* If LEN >= strlen (SRC), optimize into __strcat_chk.  */
	  fn = builtin_decl_explicit (BUILT_IN_STRCAT_CHK);
	  if (!fn)
	    return false;

	  gimple *repl = gimple_build_call (fn, 3, dest, src, size);
	  replace_call_with_call_and_fold (gsi, repl);
	  return true;
	}
      return false;
    }

  /* If __builtin_strncat_chk is used, assume strncat is available.  */
  fn = builtin_decl_explicit (BUILT_IN_STRNCAT);
  if (!fn)
    return false;

  gimple *repl = gimple_build_call (fn, 3, dest, src, len);
  replace_call_with_call_and_fold (gsi, repl);
  return true;
}

/* Build and append gimple statements to STMTS that would load a first
   character of a memory location identified by STR.  LOC is location
   of the statement.  */

static tree
gimple_load_first_char (location_t loc, tree str, gimple_seq *stmts)
{
  tree var;

  tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
  tree cst_uchar_ptr_node
    = build_pointer_type_for_mode (cst_uchar_node, ptr_mode, true);
  tree off0 = build_int_cst (cst_uchar_ptr_node, 0);

  tree temp = fold_build2_loc (loc, MEM_REF, cst_uchar_node, str, off0);
  gassign *stmt = gimple_build_assign (NULL_TREE, temp);
  var = create_tmp_reg_or_ssa_name (cst_uchar_node, stmt);

  gimple_assign_set_lhs (stmt, var);
  gimple_seq_add_stmt_without_update (stmts, stmt);

  return var;
}

/* Fold a call to the str{n}{case}cmp builtin pointed by GSI iterator.
   FCODE is the name of the builtin.  */

static bool
gimple_fold_builtin_string_compare (gimple_stmt_iterator *gsi)
{
  gimple *stmt = gsi_stmt (*gsi);
  tree callee = gimple_call_fndecl (stmt);
  enum built_in_function fcode = DECL_FUNCTION_CODE (callee);

  tree type = integer_type_node;
  tree str1 = gimple_call_arg (stmt, 0);
  tree str2 = gimple_call_arg (stmt, 1);
  tree lhs = gimple_call_lhs (stmt);
  HOST_WIDE_INT length = -1;

  /* Handle strncmp and strncasecmp functions.  */
  if (gimple_call_num_args (stmt) == 3)
    {
      tree len = gimple_call_arg (stmt, 2);
      if (tree_fits_uhwi_p (len))
	length = tree_to_uhwi (len);
    }

  /* If the LEN parameter is zero, return zero.  */
  if (length == 0)
    {
      replace_call_with_value (gsi, integer_zero_node);
      return true;
    }

  /* If ARG1 and ARG2 are the same (and not volatile), return zero.  */
  if (operand_equal_p (str1, str2, 0))
    {
      replace_call_with_value (gsi, integer_zero_node);
      return true;
    }

  const char *p1 = c_getstr (str1);
  const char *p2 = c_getstr (str2);

  /* For known strings, return an immediate value.  */
  if (p1 && p2)
    {
      int r = 0;
      bool known_result = false;

      switch (fcode)
	{
	case BUILT_IN_STRCMP:
	  {
	    r = strcmp (p1, p2);
	    known_result = true;
	    break;
	  }
	case BUILT_IN_STRNCMP:
	  {
	    if (length == -1)
	      break;
	    r = strncmp (p1, p2, length);
	    known_result = true;
	    break;
	  }
	/* Only handleable situation is where the string are equal (result 0),
	   which is already handled by operand_equal_p case.  */
	case BUILT_IN_STRCASECMP:
	  break;
	case BUILT_IN_STRNCASECMP:
	  {
	    if (length == -1)
	      break;
	    r = strncmp (p1, p2, length);
	    if (r == 0)
	      known_result = true;
	    break;;
	  }
	default:
	  gcc_unreachable ();
	}

      if (known_result)
	{
	  replace_call_with_value (gsi, build_cmp_result (type, r));
	  return true;
	}
    }

  bool nonzero_length = length >= 1
    || fcode == BUILT_IN_STRCMP
    || fcode == BUILT_IN_STRCASECMP;

  location_t loc = gimple_location (stmt);

  /* If the second arg is "", return *(const unsigned char*)arg1.  */
  if (p2 && *p2 == '\0' && nonzero_length)
    {
      gimple_seq stmts = NULL;
      tree var = gimple_load_first_char (loc, str1, &stmts);
      if (lhs)
	{
	  stmt = gimple_build_assign (lhs, NOP_EXPR, var);
	  gimple_seq_add_stmt_without_update (&stmts, stmt);
	}

      gsi_replace_with_seq_vops (gsi, stmts);
      return true;
    }

  /* If the first arg is "", return -*(const unsigned char*)arg2.  */
  if (p1 && *p1 == '\0' && nonzero_length)
    {
      gimple_seq stmts = NULL;
      tree var = gimple_load_first_char (loc, str2, &stmts);

      if (lhs)
	{
	  tree c = create_tmp_reg_or_ssa_name (integer_type_node);
	  stmt = gimple_build_assign (c, NOP_EXPR, var);
	  gimple_seq_add_stmt_without_update (&stmts, stmt);

	  stmt = gimple_build_assign (lhs, NEGATE_EXPR, c);
	  gimple_seq_add_stmt_without_update (&stmts, stmt);
	}

      gsi_replace_with_seq_vops (gsi, stmts);
      return true;
    }

  /* If len parameter is one, return an expression corresponding to
     (*(const unsigned char*)arg2 - *(const unsigned char*)arg1).  */
  if (fcode == BUILT_IN_STRNCMP && length == 1)
    {
      gimple_seq stmts = NULL;
      tree temp1 = gimple_load_first_char (loc, str1, &stmts);
      tree temp2 = gimple_load_first_char (loc, str2, &stmts);

      if (lhs)
	{
	  tree c1 = create_tmp_reg_or_ssa_name (integer_type_node);
	  gassign *convert1 = gimple_build_assign (c1, NOP_EXPR, temp1);
	  gimple_seq_add_stmt_without_update (&stmts, convert1);

	  tree c2 = create_tmp_reg_or_ssa_name (integer_type_node);
	  gassign *convert2 = gimple_build_assign (c2, NOP_EXPR, temp2);
	  gimple_seq_add_stmt_without_update (&stmts, convert2);

	  stmt = gimple_build_assign (lhs, MINUS_EXPR, c1, c2);
	  gimple_seq_add_stmt_without_update (&stmts, stmt);
	}

      gsi_replace_with_seq_vops (gsi, stmts);
      return true;
    }

  return false;
}

/* Fold a call to the memchr pointed by GSI iterator.  */

static bool
gimple_fold_builtin_memchr (gimple_stmt_iterator *gsi)
{
  gimple *stmt = gsi_stmt (*gsi);
  tree lhs = gimple_call_lhs (stmt);
  tree arg1 = gimple_call_arg (stmt, 0);
  tree arg2 = gimple_call_arg (stmt, 1);
  tree len = gimple_call_arg (stmt, 2);

  /* If the LEN parameter is zero, return zero.  */
  if (integer_zerop (len))
    {
      replace_call_with_value (gsi, build_int_cst (ptr_type_node, 0));
      return true;
    }

  char c;
  if (TREE_CODE (arg2) != INTEGER_CST
      || !tree_fits_uhwi_p (len)
      || !target_char_cst_p (arg2, &c))
    return false;

  unsigned HOST_WIDE_INT length = tree_to_uhwi (len);
  unsigned HOST_WIDE_INT string_length;
  const char *p1 = c_getstr (arg1, &string_length);

  if (p1)
    {
      const char *r = (const char *)memchr (p1, c, MIN (length, string_length));
      if (r == NULL)
	{
	  if (length <= string_length)
	    {
	      replace_call_with_value (gsi, build_int_cst (ptr_type_node, 0));
	      return true;
	    }
	}
      else
	{
	  unsigned HOST_WIDE_INT offset = r - p1;
	  gimple_seq stmts = NULL;
	  if (lhs != NULL_TREE)
	    {
	      tree offset_cst = build_int_cst (TREE_TYPE (len), offset);
	      gassign *stmt = gimple_build_assign (lhs, POINTER_PLUS_EXPR,
						   arg1, offset_cst);
	      gimple_seq_add_stmt_without_update (&stmts, stmt);
	    }
	  else
	    gimple_seq_add_stmt_without_update (&stmts,
						gimple_build_nop ());

	  gsi_replace_with_seq_vops (gsi, stmts);
	  return true;
	}
    }

  return false;
}

/* Fold a call to the fputs builtin.  ARG0 and ARG1 are the arguments
   to the call.  IGNORE is true if the value returned
   by the builtin will be ignored.  UNLOCKED is true is true if this
   actually a call to fputs_unlocked.  If LEN in non-NULL, it represents
   the known length of the string.  Return NULL_TREE if no simplification
   was possible.  */

static bool
gimple_fold_builtin_fputs (gimple_stmt_iterator *gsi,
			   tree arg0, tree arg1,
			   bool unlocked)
{
  gimple *stmt = gsi_stmt (*gsi);

  /* If we're using an unlocked function, assume the other unlocked
     functions exist explicitly.  */
  tree const fn_fputc = (unlocked
			 ? builtin_decl_explicit (BUILT_IN_FPUTC_UNLOCKED)
			 : builtin_decl_implicit (BUILT_IN_FPUTC));
  tree const fn_fwrite = (unlocked
			  ? builtin_decl_explicit (BUILT_IN_FWRITE_UNLOCKED)
			  : builtin_decl_implicit (BUILT_IN_FWRITE));

  /* If the return value is used, don't do the transformation.  */
  if (gimple_call_lhs (stmt))
    return false;

  /* Get the length of the string passed to fputs.  If the length
     can't be determined, punt.  */
  tree len = get_maxval_strlen (arg0, 0);
  if (!len
      || TREE_CODE (len) != INTEGER_CST)
    return false;

  switch (compare_tree_int (len, 1))
    {
    case -1: /* length is 0, delete the call entirely .  */
      replace_call_with_value (gsi, integer_zero_node);
      return true;

    case 0: /* length is 1, call fputc.  */
      {
	const char *p = c_getstr (arg0);
	if (p != NULL)
	  {
	    if (!fn_fputc)
	      return false;

	    gimple *repl = gimple_build_call (fn_fputc, 2,
					     build_int_cst
					     (integer_type_node, p[0]), arg1);
	    replace_call_with_call_and_fold (gsi, repl);
	    return true;
	  }
      }
      /* FALLTHROUGH */
    case 1: /* length is greater than 1, call fwrite.  */
      {
	/* If optimizing for size keep fputs.  */
	if (optimize_function_for_size_p (cfun))
	  return false;
	/* New argument list transforming fputs(string, stream) to
	   fwrite(string, 1, len, stream).  */
	if (!fn_fwrite)
	  return false;

	gimple *repl = gimple_build_call (fn_fwrite, 4, arg0,
					 size_one_node, len, arg1);
	replace_call_with_call_and_fold (gsi, repl);
	return true;
      }
    default:
      gcc_unreachable ();
    }
  return false;
}

/* Fold a call to the __mem{cpy,pcpy,move,set}_chk builtin.
   DEST, SRC, LEN, and SIZE are the arguments to the call.
   IGNORE is true, if return value can be ignored.  FCODE is the BUILT_IN_*
   code of the builtin.  If MAXLEN is not NULL, it is maximum length
   passed as third argument.  */

static bool
gimple_fold_builtin_memory_chk (gimple_stmt_iterator *gsi,
				tree dest, tree src, tree len, tree size,
				enum built_in_function fcode)
{
  gimple *stmt = gsi_stmt (*gsi);
  location_t loc = gimple_location (stmt);
  bool ignore = gimple_call_lhs (stmt) == NULL_TREE;
  tree fn;

  /* If SRC and DEST are the same (and not volatile), return DEST
     (resp. DEST+LEN for __mempcpy_chk).  */
  if (fcode != BUILT_IN_MEMSET_CHK && operand_equal_p (src, dest, 0))
    {
      if (fcode != BUILT_IN_MEMPCPY_CHK)
	{
	  replace_call_with_value (gsi, dest);
	  return true;
	}
      else
	{
	  gimple_seq stmts = NULL;
	  len = gimple_convert_to_ptrofftype (&stmts, loc, len);
	  tree temp = gimple_build (&stmts, loc, POINTER_PLUS_EXPR,
				    TREE_TYPE (dest), dest, len);
	  gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT);
	  replace_call_with_value (gsi, temp);
	  return true;
	}
    }

  if (! tree_fits_uhwi_p (size))
    return false;

  tree maxlen = get_maxval_strlen (len, 2);
  if (! integer_all_onesp (size))
    {
      if (! tree_fits_uhwi_p (len))
	{
	  /* If LEN is not constant, try MAXLEN too.
	     For MAXLEN only allow optimizing into non-_ocs function
	     if SIZE is >= MAXLEN, never convert to __ocs_fail ().  */
	  if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen))
	    {
	      if (fcode == BUILT_IN_MEMPCPY_CHK && ignore)
		{
		  /* (void) __mempcpy_chk () can be optimized into
		     (void) __memcpy_chk ().  */
		  fn = builtin_decl_explicit (BUILT_IN_MEMCPY_CHK);
		  if (!fn)
		    return false;

		  gimple *repl = gimple_build_call (fn, 4, dest, src, len, size);
		  replace_call_with_call_and_fold (gsi, repl);
		  return true;
		}
	      return false;
	    }
	}
      else
	maxlen = len;

      if (tree_int_cst_lt (size, maxlen))
	return false;
    }

  fn = NULL_TREE;
  /* If __builtin_mem{cpy,pcpy,move,set}_chk is used, assume
     mem{cpy,pcpy,move,set} is available.  */
  switch (fcode)
    {
    case BUILT_IN_MEMCPY_CHK:
      fn = builtin_decl_explicit (BUILT_IN_MEMCPY);
      break;
    case BUILT_IN_MEMPCPY_CHK:
      fn = builtin_decl_explicit (BUILT_IN_MEMPCPY);
      break;
    case BUILT_IN_MEMMOVE_CHK:
      fn = builtin_decl_explicit (BUILT_IN_MEMMOVE);
      break;
    case BUILT_IN_MEMSET_CHK:
      fn = builtin_decl_explicit (BUILT_IN_MEMSET);
      break;
    default:
      break;
    }

  if (!fn)
    return false;

  gimple *repl = gimple_build_call (fn, 3, dest, src, len);
  replace_call_with_call_and_fold (gsi, repl);
  return true;
}

/* Fold a call to the __st[rp]cpy_chk builtin.
   DEST, SRC, and SIZE are the arguments to the call.
   IGNORE is true if return value can be ignored.  FCODE is the BUILT_IN_*
   code of the builtin.  If MAXLEN is not NULL, it is maximum length of
   strings passed as second argument.  */

static bool
gimple_fold_builtin_stxcpy_chk (gimple_stmt_iterator *gsi,
				tree dest,
				tree src, tree size,
				enum built_in_function fcode)
{
  gimple *stmt = gsi_stmt (*gsi);
  location_t loc = gimple_location (stmt);
  bool ignore = gimple_call_lhs (stmt) == NULL_TREE;
  tree len, fn;

  /* If SRC and DEST are the same (and not volatile), return DEST.  */
  if (fcode == BUILT_IN_STRCPY_CHK && operand_equal_p (src, dest, 0))
    {
      replace_call_with_value (gsi, dest);
      return true;
    }

  if (! tree_fits_uhwi_p (size))
    return false;

  tree maxlen = get_maxval_strlen (src, 1);
  if (! integer_all_onesp (size))
    {
      len = c_strlen (src, 1);
      if (! len || ! tree_fits_uhwi_p (len))
	{
	  /* If LEN is not constant, try MAXLEN too.
	     For MAXLEN only allow optimizing into non-_ocs function
	     if SIZE is >= MAXLEN, never convert to __ocs_fail ().  */
	  if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen))
	    {
	      if (fcode == BUILT_IN_STPCPY_CHK)
		{
		  if (! ignore)
		    return false;

		  /* If return value of __stpcpy_chk is ignored,
		     optimize into __strcpy_chk.  */
		  fn = builtin_decl_explicit (BUILT_IN_STRCPY_CHK);
		  if (!fn)
		    return false;

		  gimple *repl = gimple_build_call (fn, 3, dest, src, size);
		  replace_call_with_call_and_fold (gsi, repl);
		  return true;
		}

	      if (! len || TREE_SIDE_EFFECTS (len))
		return false;

	      /* If c_strlen returned something, but not a constant,
		 transform __strcpy_chk into __memcpy_chk.  */
	      fn = builtin_decl_explicit (BUILT_IN_MEMCPY_CHK);
	      if (!fn)
		return false;

	      gimple_seq stmts = NULL;
	      len = gimple_convert (&stmts, loc, size_type_node, len);
	      len = gimple_build (&stmts, loc, PLUS_EXPR, size_type_node, len,
				  build_int_cst (size_type_node, 1));
	      gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT);
	      gimple *repl = gimple_build_call (fn, 4, dest, src, len, size);
	      replace_call_with_call_and_fold (gsi, repl);
	      return true;
	    }
	}
      else
	maxlen = len;

      if (! tree_int_cst_lt (maxlen, size))
	return false;
    }

  /* If __builtin_st{r,p}cpy_chk is used, assume st{r,p}cpy is available.  */
  fn = builtin_decl_explicit (fcode == BUILT_IN_STPCPY_CHK
			      ? BUILT_IN_STPCPY : BUILT_IN_STRCPY);
  if (!fn)
    return false;

  gimple *repl = gimple_build_call (fn, 2, dest, src);
  replace_call_with_call_and_fold (gsi, repl);
  return true;
}

/* Fold a call to the __st{r,p}ncpy_chk builtin.  DEST, SRC, LEN, and SIZE
   are the arguments to the call.  If MAXLEN is not NULL, it is maximum
   length passed as third argument. IGNORE is true if return value can be
   ignored. FCODE is the BUILT_IN_* code of the builtin. */

static bool
gimple_fold_builtin_stxncpy_chk (gimple_stmt_iterator *gsi,
				 tree dest, tree src,
				 tree len, tree size,
				 enum built_in_function fcode)
{
  gimple *stmt = gsi_stmt (*gsi);
  bool ignore = gimple_call_lhs (stmt) == NULL_TREE;
  tree fn;

  if (fcode == BUILT_IN_STPNCPY_CHK && ignore)
    {
       /* If return value of __stpncpy_chk is ignored,
          optimize into __strncpy_chk.  */
       fn = builtin_decl_explicit (BUILT_IN_STRNCPY_CHK);
       if (fn)
	 {
	   gimple *repl = gimple_build_call (fn, 4, dest, src, len, size);
	   replace_call_with_call_and_fold (gsi, repl);
	   return true;
	 }
    }

  if (! tree_fits_uhwi_p (size))
    return false;

  tree maxlen = get_maxval_strlen (len, 2);
  if (! integer_all_onesp (size))
    {
      if (! tree_fits_uhwi_p (len))
	{
	  /* If LEN is not constant, try MAXLEN too.
	     For MAXLEN only allow optimizing into non-_ocs function
	     if SIZE is >= MAXLEN, never convert to __ocs_fail ().  */
	  if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen))
	    return false;
	}
      else
	maxlen = len;

      if (tree_int_cst_lt (size, maxlen))
	return false;
    }

  /* If __builtin_st{r,p}ncpy_chk is used, assume st{r,p}ncpy is available.  */
  fn = builtin_decl_explicit (fcode == BUILT_IN_STPNCPY_CHK
			      ? BUILT_IN_STPNCPY : BUILT_IN_STRNCPY);
  if (!fn)
    return false;

  gimple *repl = gimple_build_call (fn, 3, dest, src, len);
  replace_call_with_call_and_fold (gsi, repl);
  return true;
}

/* Fold function call to builtin stpcpy with arguments DEST and SRC.
   Return NULL_TREE if no simplification can be made.  */

static bool
gimple_fold_builtin_stpcpy (gimple_stmt_iterator *gsi)
{
  gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi));
  location_t loc = gimple_location (stmt);
  tree dest = gimple_call_arg (stmt, 0);
  tree src = gimple_call_arg (stmt, 1);
  tree fn, len, lenp1;

  /* If the result is unused, replace stpcpy with strcpy.  */
  if (gimple_call_lhs (stmt) == NULL_TREE)
    {
      tree fn = builtin_decl_implicit (BUILT_IN_STRCPY);
      if (!fn)
	return false;
      gimple_call_set_fndecl (stmt, fn);
      fold_stmt (gsi);
      return true;
    }

  len = c_strlen (src, 1);
  if (!len
      || TREE_CODE (len) != INTEGER_CST)
    return false;

  if (optimize_function_for_size_p (cfun)
      /* If length is zero it's small enough.  */
      && !integer_zerop (len))
    return false;

  /* If the source has a known length replace stpcpy with memcpy.  */
  fn = builtin_decl_implicit (BUILT_IN_MEMCPY);
  if (!fn)
    return false;

  gimple_seq stmts = NULL;
  tree tem = gimple_convert (&stmts, loc, size_type_node, len);
  lenp1 = gimple_build (&stmts, loc, PLUS_EXPR, size_type_node,
			tem, build_int_cst (size_type_node, 1));
  gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT);
  gcall *repl = gimple_build_call (fn, 3, dest, src, lenp1);
  gimple_set_vuse (repl, gimple_vuse (stmt));
  gimple_set_vdef (repl, gimple_vdef (stmt));
  if (gimple_vdef (repl)
      && TREE_CODE (gimple_vdef (repl)) == SSA_NAME)
    SSA_NAME_DEF_STMT (gimple_vdef (repl)) = repl;
  gsi_insert_before (gsi, repl, GSI_SAME_STMT);
  /* Replace the result with dest + len.  */
  stmts = NULL;
  tem = gimple_convert (&stmts, loc, sizetype, len);
  gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT);
  gassign *ret = gimple_build_assign (gimple_call_lhs (stmt),
				      POINTER_PLUS_EXPR, dest, tem);
  gsi_replace (gsi, ret, false);
  /* Finally fold the memcpy call.  */
  gimple_stmt_iterator gsi2 = *gsi;
  gsi_prev (&gsi2);
  fold_stmt (&gsi2);
  return true;
}

/* Fold a call EXP to {,v}snprintf having NARGS passed as ARGS.  Return
   NULL_TREE if a normal call should be emitted rather than expanding
   the function inline.  FCODE is either BUILT_IN_SNPRINTF_CHK or
   BUILT_IN_VSNPRINTF_CHK.  If MAXLEN is not NULL, it is maximum length
   passed as second argument.  */

static bool
gimple_fold_builtin_snprintf_chk (gimple_stmt_iterator *gsi,
				  enum built_in_function fcode)
{
  gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi));
  tree dest, size, len, fn, fmt, flag;
  const char *fmt_str;

  /* Verify the required arguments in the original call.  */
  if (gimple_call_num_args (stmt) < 5)
    return false;

  dest = gimple_call_arg (stmt, 0);
  len = gimple_call_arg (stmt, 1);
  flag = gimple_call_arg (stmt, 2);
  size = gimple_call_arg (stmt, 3);
  fmt = gimple_call_arg (stmt, 4);

  if (! tree_fits_uhwi_p (size))
    return false;

  if (! integer_all_onesp (size))
    {
      tree maxlen = get_maxval_strlen (len, 2);
      if (! tree_fits_uhwi_p (len))
	{
	  /* If LEN is not constant, try MAXLEN too.
	     For MAXLEN only allow optimizing into non-_ocs function
	     if SIZE is >= MAXLEN, never convert to __ocs_fail ().  */
	  if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen))
	    return false;
	}
      else
	maxlen = len;

      if (tree_int_cst_lt (size, maxlen))
	return false;
    }

  if (!init_target_chars ())
    return false;

  /* Only convert __{,v}snprintf_chk to {,v}snprintf if flag is 0
     or if format doesn't contain % chars or is "%s".  */
  if (! integer_zerop (flag))
    {
      fmt_str = c_getstr (fmt);
      if (fmt_str == NULL)
	return false;
      if (strchr (fmt_str, target_percent) != NULL
	  && strcmp (fmt_str, target_percent_s))
	return false;
    }

  /* If __builtin_{,v}snprintf_chk is used, assume {,v}snprintf is
     available.  */
  fn = builtin_decl_explicit (fcode == BUILT_IN_VSNPRINTF_CHK
			      ? BUILT_IN_VSNPRINTF : BUILT_IN_SNPRINTF);
  if (!fn)
    return false;

  /* Replace the called function and the first 5 argument by 3 retaining
     trailing varargs.  */
  gimple_call_set_fndecl (stmt, fn);
  gimple_call_set_fntype (stmt, TREE_TYPE (fn));
  gimple_call_set_arg (stmt, 0, dest);
  gimple_call_set_arg (stmt, 1, len);
  gimple_call_set_arg (stmt, 2, fmt);
  for (unsigned i = 3; i < gimple_call_num_args (stmt) - 2; ++i)
    gimple_call_set_arg (stmt, i, gimple_call_arg (stmt, i + 2));
  gimple_set_num_ops (stmt, gimple_num_ops (stmt) - 2);
  fold_stmt (gsi);
  return true;
}

/* Fold a call EXP to __{,v}sprintf_chk having NARGS passed as ARGS.
   Return NULL_TREE if a normal call should be emitted rather than
   expanding the function inline.  FCODE is either BUILT_IN_SPRINTF_CHK
   or BUILT_IN_VSPRINTF_CHK.  */

static bool
gimple_fold_builtin_sprintf_chk (gimple_stmt_iterator *gsi,
				 enum built_in_function fcode)
{
  gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi));
  tree dest, size, len, fn, fmt, flag;
  const char *fmt_str;
  unsigned nargs = gimple_call_num_args (stmt);

  /* Verify the required arguments in the original call.  */
  if (nargs < 4)
    return false;
  dest = gimple_call_arg (stmt, 0);
  flag = gimple_call_arg (stmt, 1);
  size = gimple_call_arg (stmt, 2);
  fmt = gimple_call_arg (stmt, 3);

  if (! tree_fits_uhwi_p (size))
    return false;

  len = NULL_TREE;

  if (!init_target_chars ())
    return false;

  /* Check whether the format is a literal string constant.  */
  fmt_str = c_getstr (fmt);
  if (fmt_str != NULL)
    {
      /* If the format doesn't contain % args or %%, we know the size.  */
      if (strchr (fmt_str, target_percent) == 0)
	{
	  if (fcode != BUILT_IN_SPRINTF_CHK || nargs == 4)
	    len = build_int_cstu (size_type_node, strlen (fmt_str));
	}
      /* If the format is "%s" and first ... argument is a string literal,
	 we know the size too.  */
      else if (fcode == BUILT_IN_SPRINTF_CHK
	       && strcmp (fmt_str, target_percent_s) == 0)
	{
	  tree arg;

	  if (nargs == 5)
	    {
	      arg = gimple_call_arg (stmt, 4);
	      if (POINTER_TYPE_P (TREE_TYPE (arg)))
		{
		  len = c_strlen (arg, 1);
		  if (! len || ! tree_fits_uhwi_p (len))
		    len = NULL_TREE;
		}
	    }
	}
    }

  if (! integer_all_onesp (size))
    {
      if (! len || ! tree_int_cst_lt (len, size))
	return false;
    }

  /* Only convert __{,v}sprintf_chk to {,v}sprintf if flag is 0
     or if format doesn't contain % chars or is "%s".  */
  if (! integer_zerop (flag))
    {
      if (fmt_str == NULL)
	return false;
      if (strchr (fmt_str, target_percent) != NULL
	  && strcmp (fmt_str, target_percent_s))
	return false;
    }

  /* If __builtin_{,v}sprintf_chk is used, assume {,v}sprintf is available.  */
  fn = builtin_decl_explicit (fcode == BUILT_IN_VSPRINTF_CHK
			      ? BUILT_IN_VSPRINTF : BUILT_IN_SPRINTF);
  if (!fn)
    return false;

  /* Replace the called function and the first 4 argument by 2 retaining
     trailing varargs.  */
  gimple_call_set_fndecl (stmt, fn);
  gimple_call_set_fntype (stmt, TREE_TYPE (fn));
  gimple_call_set_arg (stmt, 0, dest);
  gimple_call_set_arg (stmt, 1, fmt);
  for (unsigned i = 2; i < gimple_call_num_args (stmt) - 2; ++i)
    gimple_call_set_arg (stmt, i, gimple_call_arg (stmt, i + 2));
  gimple_set_num_ops (stmt, gimple_num_ops (stmt) - 2);
  fold_stmt (gsi);
  return true;
}

/* Simplify a call to the sprintf builtin with arguments DEST, FMT, and ORIG.
   ORIG may be null if this is a 2-argument call.  We don't attempt to
   simplify calls with more than 3 arguments.

   Return NULL_TREE if no simplification was possible, otherwise return the
   simplified form of the call as a tree.  If IGNORED is true, it means that
   the caller does not use the returned value of the function.  */

static bool
gimple_fold_builtin_sprintf (gimple_stmt_iterator *gsi)
{
  gimple *stmt = gsi_stmt (*gsi);
  tree dest = gimple_call_arg (stmt, 0);
  tree fmt = gimple_call_arg (stmt, 1);
  tree orig = NULL_TREE;
  const char *fmt_str = NULL;

  /* Verify the required arguments in the original call.  We deal with two
     types of sprintf() calls: 'sprintf (str, fmt)' and
     'sprintf (dest, "%s", orig)'.  */
  if (gimple_call_num_args (stmt) > 3)
    return false;

  if (gimple_call_num_args (stmt) == 3)
    orig = gimple_call_arg (stmt, 2);

  /* Check whether the format is a literal string constant.  */
  fmt_str = c_getstr (fmt);
  if (fmt_str == NULL)
    return false;

  if (!init_target_chars ())
    return false;

  /* If the format doesn't contain % args or %%, use strcpy.  */
  if (strchr (fmt_str, target_percent) == NULL)
    {
      tree fn = builtin_decl_implicit (BUILT_IN_STRCPY);

      if (!fn)
	return false;

      /* Don't optimize sprintf (buf, "abc", ptr++).  */
      if (orig)
	return false;

      /* Convert sprintf (str, fmt) into strcpy (str, fmt) when
	 'format' is known to contain no % formats.  */
      gimple_seq stmts = NULL;
      gimple *repl = gimple_build_call (fn, 2, dest, fmt);
      gimple_seq_add_stmt_without_update (&stmts, repl);
      if (gimple_call_lhs (stmt))
	{
	  repl = gimple_build_assign (gimple_call_lhs (stmt),
				      build_int_cst (integer_type_node,
						     strlen (fmt_str)));
	  gimple_seq_add_stmt_without_update (&stmts, repl);
	  gsi_replace_with_seq_vops (gsi, stmts);
	  /* gsi now points at the assignment to the lhs, get a
	     stmt iterator to the memcpy call.
	     ???  We can't use gsi_for_stmt as that doesn't work when the
	     CFG isn't built yet.  */
	  gimple_stmt_iterator gsi2 = *gsi;
	  gsi_prev (&gsi2);
	  fold_stmt (&gsi2);
	}
      else
	{
	  gsi_replace_with_seq_vops (gsi, stmts);
	  fold_stmt (gsi);
	}
      return true;
    }

  /* If the format is "%s", use strcpy if the result isn't used.  */
  else if (fmt_str && strcmp (fmt_str, target_percent_s) == 0)
    {
      tree fn;
      fn = builtin_decl_implicit (BUILT_IN_STRCPY);

      if (!fn)
	return false;

      /* Don't crash on sprintf (str1, "%s").  */
      if (!orig)
	return false;

      tree orig_len = NULL_TREE;
      if (gimple_call_lhs (stmt))
	{
	  orig_len = get_maxval_strlen (orig, 0);
	  if (!orig_len)
	    return false;
	}

      /* Convert sprintf (str1, "%s", str2) into strcpy (str1, str2).  */
      gimple_seq stmts = NULL;
      gimple *repl = gimple_build_call (fn, 2, dest, orig);
      gimple_seq_add_stmt_without_update (&stmts, repl);
      if (gimple_call_lhs (stmt))
	{
	  if (!useless_type_conversion_p (integer_type_node,
					  TREE_TYPE (orig_len)))
	    orig_len = fold_convert (integer_type_node, orig_len);
	  repl = gimple_build_assign (gimple_call_lhs (stmt), orig_len);
	  gimple_seq_add_stmt_without_update (&stmts, repl);
	  gsi_replace_with_seq_vops (gsi, stmts);
	  /* gsi now points at the assignment to the lhs, get a
	     stmt iterator to the memcpy call.
	     ???  We can't use gsi_for_stmt as that doesn't work when the
	     CFG isn't built yet.  */
	  gimple_stmt_iterator gsi2 = *gsi;
	  gsi_prev (&gsi2);
	  fold_stmt (&gsi2);
	}
      else
	{
	  gsi_replace_with_seq_vops (gsi, stmts);
	  fold_stmt (gsi);
	}
      return true;
    }
  return false;
}

/* Simplify a call to the snprintf builtin with arguments DEST, DESTSIZE,
   FMT, and ORIG.  ORIG may be null if this is a 3-argument call.  We don't
   attempt to simplify calls with more than 4 arguments.

   Return NULL_TREE if no simplification was possible, otherwise return the
   simplified form of the call as a tree.  If IGNORED is true, it means that
   the caller does not use the returned value of the function.  */

static bool
gimple_fold_builtin_snprintf (gimple_stmt_iterator *gsi)
{
  gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi));
  tree dest = gimple_call_arg (stmt, 0);
  tree destsize = gimple_call_arg (stmt, 1);
  tree fmt = gimple_call_arg (stmt, 2);
  tree orig = NULL_TREE;
  const char *fmt_str = NULL;

  if (gimple_call_num_args (stmt) > 4)
    return false;

  if (gimple_call_num_args (stmt) == 4)
    orig = gimple_call_arg (stmt, 3);

  if (!tree_fits_uhwi_p (destsize))
    return false;
  unsigned HOST_WIDE_INT destlen = tree_to_uhwi (destsize);

  /* Check whether the format is a literal string constant.  */
  fmt_str = c_getstr (fmt);
  if (fmt_str == NULL)
    return false;

  if (!init_target_chars ())
    return false;

  /* If the format doesn't contain % args or %%, use strcpy.  */
  if (strchr (fmt_str, target_percent) == NULL)
    {
      tree fn = builtin_decl_implicit (BUILT_IN_STRCPY);
      if (!fn)
	return false;

      /* Don't optimize snprintf (buf, 4, "abc", ptr++).  */
      if (orig)
	return false;

      /* We could expand this as
	 memcpy (str, fmt, cst - 1); str[cst - 1] = '\0';
	 or to
	 memcpy (str, fmt_with_nul_at_cstm1, cst);
	 but in the former case that might increase code size
	 and in the latter case grow .rodata section too much.
	 So punt for now.  */
      size_t len = strlen (fmt_str);
      if (len >= destlen)
	return false;

      gimple_seq stmts = NULL;
      gimple *repl = gimple_build_call (fn, 2, dest, fmt);
      gimple_seq_add_stmt_without_update (&stmts, repl);
      if (gimple_call_lhs (stmt))
	{
	  repl = gimple_build_assign (gimple_call_lhs (stmt),
				      build_int_cst (integer_type_node, len));
	  gimple_seq_add_stmt_without_update (&stmts, repl);
	  gsi_replace_with_seq_vops (gsi, stmts);
	  /* gsi now points at the assignment to the lhs, get a
	     stmt iterator to the memcpy call.
	     ???  We can't use gsi_for_stmt as that doesn't work when the
	     CFG isn't built yet.  */
	  gimple_stmt_iterator gsi2 = *gsi;
	  gsi_prev (&gsi2);
	  fold_stmt (&gsi2);
	}
      else
	{
	  gsi_replace_with_seq_vops (gsi, stmts);
	  fold_stmt (gsi);
	}
      return true;
    }

  /* If the format is "%s", use strcpy if the result isn't used.  */
  else if (fmt_str && strcmp (fmt_str, target_percent_s) == 0)
    {
      tree fn = builtin_decl_implicit (BUILT_IN_STRCPY);
      if (!fn)
	return false;

      /* Don't crash on snprintf (str1, cst, "%s").  */
      if (!orig)
	return false;

      tree orig_len = get_maxval_strlen (orig, 0);
      if (!orig_len || TREE_CODE (orig_len) != INTEGER_CST)
	return false;

      /* We could expand this as
	 memcpy (str1, str2, cst - 1); str1[cst - 1] = '\0';
	 or to
	 memcpy (str1, str2_with_nul_at_cstm1, cst);
	 but in the former case that might increase code size
	 and in the latter case grow .rodata section too much.
	 So punt for now.  */
      if (compare_tree_int (orig_len, destlen) >= 0)
	return false;

      /* Convert snprintf (str1, cst, "%s", str2) into
	 strcpy (str1, str2) if strlen (str2) < cst.  */
      gimple_seq stmts = NULL;
      gimple *repl = gimple_build_call (fn, 2, dest, orig);
      gimple_seq_add_stmt_without_update (&stmts, repl);
      if (gimple_call_lhs (stmt))
	{
	  if (!useless_type_conversion_p (integer_type_node,
					  TREE_TYPE (orig_len)))
	    orig_len = fold_convert (integer_type_node, orig_len);
	  repl = gimple_build_assign (gimple_call_lhs (stmt), orig_len);
	  gimple_seq_add_stmt_without_update (&stmts, repl);
	  gsi_replace_with_seq_vops (gsi, stmts);
	  /* gsi now points at the assignment to the lhs, get a
	     stmt iterator to the memcpy call.
	     ???  We can't use gsi_for_stmt as that doesn't work when the
	     CFG isn't built yet.  */
	  gimple_stmt_iterator gsi2 = *gsi;
	  gsi_prev (&gsi2);
	  fold_stmt (&gsi2);
	}
      else
	{
	  gsi_replace_with_seq_vops (gsi, stmts);
	  fold_stmt (gsi);
	}
      return true;
    }
  return false;
}

/* Fold a call to the {,v}fprintf{,_unlocked} and __{,v}printf_chk builtins.
   FP, FMT, and ARG are the arguments to the call.  We don't fold calls with
   more than 3 arguments, and ARG may be null in the 2-argument case.

   Return NULL_TREE if no simplification was possible, otherwise return the
   simplified form of the call as a tree.  FCODE is the BUILT_IN_*
   code of the function to be simplified.  */

static bool 
gimple_fold_builtin_fprintf (gimple_stmt_iterator *gsi,
			     tree fp, tree fmt, tree arg,
			     enum built_in_function fcode)
{
  gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi));
  tree fn_fputc, fn_fputs;
  const char *fmt_str = NULL;

  /* If the return value is used, don't do the transformation.  */
  if (gimple_call_lhs (stmt) != NULL_TREE)
    return false;

  /* Check whether the format is a literal string constant.  */
  fmt_str = c_getstr (fmt);
  if (fmt_str == NULL)
    return false;

  if (fcode == BUILT_IN_FPRINTF_UNLOCKED)
    {
      /* If we're using an unlocked function, assume the other
	 unlocked functions exist explicitly.  */
      fn_fputc = builtin_decl_explicit (BUILT_IN_FPUTC_UNLOCKED);
      fn_fputs = builtin_decl_explicit (BUILT_IN_FPUTS_UNLOCKED);
    }
  else
    {
      fn_fputc = builtin_decl_implicit (BUILT_IN_FPUTC);
      fn_fputs = builtin_decl_implicit (BUILT_IN_FPUTS);
    }

  if (!init_target_chars ())
    return false;

  /* If the format doesn't contain % args or %%, use strcpy.  */
  if (strchr (fmt_str, target_percent) == NULL)
    {
      if (fcode != BUILT_IN_VFPRINTF && fcode != BUILT_IN_VFPRINTF_CHK
	  && arg)
	return false;

      /* If the format specifier was "", fprintf does nothing.  */
      if (fmt_str[0] == '\0')
	{
	  replace_call_with_value (gsi, NULL_TREE);
	  return true;
	}

      /* When "string" doesn't contain %, replace all cases of
	 fprintf (fp, string) with fputs (string, fp).  The fputs
	 builtin will take care of special cases like length == 1.  */
      if (fn_fputs)
	{
	  gcall *repl = gimple_build_call (fn_fputs, 2, fmt, fp);
	  replace_call_with_call_and_fold (gsi, repl);
	  return true;
	}
    }

  /* The other optimizations can be done only on the non-va_list variants.  */
  else if (fcode == BUILT_IN_VFPRINTF || fcode == BUILT_IN_VFPRINTF_CHK)
    return false;

  /* If the format specifier was "%s", call __builtin_fputs (arg, fp).  */
  else if (strcmp (fmt_str, target_percent_s) == 0)
    {
      if (!arg || ! POINTER_TYPE_P (TREE_TYPE (arg)))
	return false;
      if (fn_fputs)
	{
	  gcall *repl = gimple_build_call (fn_fputs, 2, arg, fp);
	  replace_call_with_call_and_fold (gsi, repl);
	  return true;
	}
    }

  /* If the format specifier was "%c", call __builtin_fputc (arg, fp).  */
  else if (strcmp (fmt_str, target_percent_c) == 0)
    {
      if (!arg
	  || ! useless_type_conversion_p (integer_type_node, TREE_TYPE (arg)))
	return false;
      if (fn_fputc)
	{
	  gcall *repl = gimple_build_call (fn_fputc, 2, arg, fp);
	  replace_call_with_call_and_fold (gsi, repl);
	  return true;
	}
    }

  return false;
}

/* Fold a call to the {,v}printf{,_unlocked} and __{,v}printf_chk builtins.
   FMT and ARG are the arguments to the call; we don't fold cases with
   more than 2 arguments, and ARG may be null if this is a 1-argument case.

   Return NULL_TREE if no simplification was possible, otherwise return the
   simplified form of the call as a tree.  FCODE is the BUILT_IN_*
   code of the function to be simplified.  */

static bool
gimple_fold_builtin_printf (gimple_stmt_iterator *gsi, tree fmt,
			    tree arg, enum built_in_function fcode)
{
  gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi));
  tree fn_putchar, fn_puts, newarg;
  const char *fmt_str = NULL;

  /* If the return value is used, don't do the transformation.  */
  if (gimple_call_lhs (stmt) != NULL_TREE)
    return false;

  /* Check whether the format is a literal string constant.  */
  fmt_str = c_getstr (fmt);
  if (fmt_str == NULL)
    return false;

  if (fcode == BUILT_IN_PRINTF_UNLOCKED)
    {
      /* If we're using an unlocked function, assume the other
	 unlocked functions exist explicitly.  */
      fn_putchar = builtin_decl_explicit (BUILT_IN_PUTCHAR_UNLOCKED);
      fn_puts = builtin_decl_explicit (BUILT_IN_PUTS_UNLOCKED);
    }
  else
    {
      fn_putchar = builtin_decl_implicit (BUILT_IN_PUTCHAR);
      fn_puts = builtin_decl_implicit (BUILT_IN_PUTS);
    }

  if (!init_target_chars ())
    return false;

  if (strcmp (fmt_str, target_percent_s) == 0
      || strchr (fmt_str, target_percent) == NULL)
    {
      const char *str;

      if (strcmp (fmt_str, target_percent_s) == 0)
	{
	  if (fcode == BUILT_IN_VPRINTF || fcode == BUILT_IN_VPRINTF_CHK)
	    return false;

	  if (!arg || ! POINTER_TYPE_P (TREE_TYPE (arg)))
	    return false;

	  str = c_getstr (arg);
	  if (str == NULL)
	    return false;
	}
      else
	{
	  /* The format specifier doesn't contain any '%' characters.  */
	  if (fcode != BUILT_IN_VPRINTF && fcode != BUILT_IN_VPRINTF_CHK
	      && arg)
	    return false;
	  str = fmt_str;
	}

      /* If the string was "", printf does nothing.  */
      if (str[0] == '\0')
	{
	  replace_call_with_value (gsi, NULL_TREE);
	  return true;
	}

      /* If the string has length of 1, call putchar.  */
      if (str[1] == '\0')
	{
	  /* Given printf("c"), (where c is any one character,)
	     convert "c"[0] to an int and pass that to the replacement
	     function.  */
	  newarg = build_int_cst (integer_type_node, str[0]);
	  if (fn_putchar)
	    {
	      gcall *repl = gimple_build_call (fn_putchar, 1, newarg);
	      replace_call_with_call_and_fold (gsi, repl);
	      return true;
	    }
	}
      else
	{
	  /* If the string was "string\n", call puts("string").  */
	  size_t len = strlen (str);
	  if ((unsigned char)str[len - 1] == target_newline
	      && (size_t) (int) len == len
	      && (int) len > 0)
	    {
	      char *newstr;
	      tree offset_node, string_cst;

	      /* Create a NUL-terminated string that's one char shorter
		 than the original, stripping off the trailing '\n'.  */
	      newarg = build_string_literal (len, str);
	      string_cst = string_constant (newarg, &offset_node);
	      gcc_checking_assert (string_cst
				   && (TREE_STRING_LENGTH (string_cst)
				       == (int) len)
				   && integer_zerop (offset_node)
				   && (unsigned char)
				      TREE_STRING_POINTER (string_cst)[len - 1]
				      == target_newline);
	      /* build_string_literal creates a new STRING_CST,
		 modify it in place to avoid double copying.  */
	      newstr = CONST_CAST (char *, TREE_STRING_POINTER (string_cst));
	      newstr[len - 1] = '\0';
	      if (fn_puts)
		{
		  gcall *repl = gimple_build_call (fn_puts, 1, newarg);
		  replace_call_with_call_and_fold (gsi, repl);
		  return true;
		}
	    }
	  else
	    /* We'd like to arrange to call fputs(string,stdout) here,
	       but we need stdout and don't have a way to get it yet.  */
	    return false;
	}
    }

  /* The other optimizations can be done only on the non-va_list variants.  */
  else if (fcode == BUILT_IN_VPRINTF || fcode == BUILT_IN_VPRINTF_CHK)
    return false;

  /* If the format specifier was "%s\n", call __builtin_puts(arg).  */
  else if (strcmp (fmt_str, target_percent_s_newline) == 0)
    {
      if (!arg || ! POINTER_TYPE_P (TREE_TYPE (arg)))
	return false;
      if (fn_puts)
	{
	  gcall *repl = gimple_build_call (fn_puts, 1, arg);
	  replace_call_with_call_and_fold (gsi, repl);
	  return true;
	}
    }

  /* If the format specifier was "%c", call __builtin_putchar(arg).  */
  else if (strcmp (fmt_str, target_percent_c) == 0)
    {
      if (!arg || ! useless_type_conversion_p (integer_type_node,
					       TREE_TYPE (arg)))
	return false;
      if (fn_putchar)
	{
	  gcall *repl = gimple_build_call (fn_putchar, 1, arg);
	  replace_call_with_call_and_fold (gsi, repl);
	  return true;
	}
    }

  return false;
}



/* Fold a call to __builtin_strlen with known length LEN.  */

static bool
gimple_fold_builtin_strlen (gimple_stmt_iterator *gsi)
{
  gimple *stmt = gsi_stmt (*gsi);
  tree len = get_maxval_strlen (gimple_call_arg (stmt, 0), 0);
  if (!len)
    return false;
  len = force_gimple_operand_gsi (gsi, len, true, NULL, true, GSI_SAME_STMT);
  replace_call_with_value (gsi, len);
  return true;
}

/* Fold a call to __builtin_acc_on_device.  */

static bool
gimple_fold_builtin_acc_on_device (gimple_stmt_iterator *gsi, tree arg0)
{
  /* Defer folding until we know which compiler we're in.  */
  if (symtab->state != EXPANSION)
    return false;

  unsigned val_host = GOMP_DEVICE_HOST;
  unsigned val_dev = GOMP_DEVICE_NONE;

#ifdef ACCEL_COMPILER
  val_host = GOMP_DEVICE_NOT_HOST;
  val_dev = ACCEL_COMPILER_acc_device;
#endif

  location_t loc = gimple_location (gsi_stmt (*gsi));
  
  tree host_eq = make_ssa_name (boolean_type_node);
  gimple *host_ass = gimple_build_assign
    (host_eq, EQ_EXPR, arg0, build_int_cst (TREE_TYPE (arg0), val_host));
  gimple_set_location (host_ass, loc);
  gsi_insert_before (gsi, host_ass, GSI_SAME_STMT);

  tree dev_eq = make_ssa_name (boolean_type_node);
  gimple *dev_ass = gimple_build_assign
    (dev_eq, EQ_EXPR, arg0, build_int_cst (TREE_TYPE (arg0), val_dev));
  gimple_set_location (dev_ass, loc);
  gsi_insert_before (gsi, dev_ass, GSI_SAME_STMT);

  tree result = make_ssa_name (boolean_type_node);
  gimple *result_ass = gimple_build_assign
    (result, BIT_IOR_EXPR, host_eq, dev_eq);
  gimple_set_location (result_ass, loc);
  gsi_insert_before (gsi, result_ass, GSI_SAME_STMT);

  replace_call_with_value (gsi, result);

  return true;
}

/* Fold the non-target builtin at *GSI and return whether any simplification
   was made.  */

static bool
gimple_fold_builtin (gimple_stmt_iterator *gsi)
{
  gcall *stmt = as_a <gcall *>(gsi_stmt (*gsi));
  tree callee = gimple_call_fndecl (stmt);

  /* Give up for always_inline inline builtins until they are
     inlined.  */
  if (avoid_folding_inline_builtin (callee))
    return false;

  unsigned n = gimple_call_num_args (stmt);
  enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
  switch (fcode)
    {
    case BUILT_IN_BZERO:
      return gimple_fold_builtin_memset (gsi, integer_zero_node,
					 gimple_call_arg (stmt, 1));
    case BUILT_IN_MEMSET:
      return gimple_fold_builtin_memset (gsi,
					 gimple_call_arg (stmt, 1),
					 gimple_call_arg (stmt, 2));
    case BUILT_IN_BCOPY:
      return gimple_fold_builtin_memory_op (gsi, gimple_call_arg (stmt, 1),
					    gimple_call_arg (stmt, 0), 3);
    case BUILT_IN_MEMCPY:
      return gimple_fold_builtin_memory_op (gsi, gimple_call_arg (stmt, 0),
					    gimple_call_arg (stmt, 1), 0);
    case BUILT_IN_MEMPCPY:
      return gimple_fold_builtin_memory_op (gsi, gimple_call_arg (stmt, 0),
					    gimple_call_arg (stmt, 1), 1);
    case BUILT_IN_MEMMOVE:
      return gimple_fold_builtin_memory_op (gsi, gimple_call_arg (stmt, 0),
					    gimple_call_arg (stmt, 1), 3);
    case BUILT_IN_SPRINTF_CHK:
    case BUILT_IN_VSPRINTF_CHK:
      return gimple_fold_builtin_sprintf_chk (gsi, fcode);
    case BUILT_IN_STRCAT_CHK:
      return gimple_fold_builtin_strcat_chk (gsi);
    case BUILT_IN_STRNCAT_CHK:
      return gimple_fold_builtin_strncat_chk (gsi);
    case BUILT_IN_STRLEN:
      return gimple_fold_builtin_strlen (gsi);
    case BUILT_IN_STRCPY:
      return gimple_fold_builtin_strcpy (gsi,
					 gimple_call_arg (stmt, 0),
					 gimple_call_arg (stmt, 1));
    case BUILT_IN_STRNCPY:
      return gimple_fold_builtin_strncpy (gsi,
					  gimple_call_arg (stmt, 0),
					  gimple_call_arg (stmt, 1),
					  gimple_call_arg (stmt, 2));
    case BUILT_IN_STRCAT:
      return gimple_fold_builtin_strcat (gsi, gimple_call_arg (stmt, 0),
					 gimple_call_arg (stmt, 1));
    case BUILT_IN_STRNCAT:
      return gimple_fold_builtin_strncat (gsi);
    case BUILT_IN_INDEX:
    case BUILT_IN_STRCHR:
      return gimple_fold_builtin_strchr (gsi, false);
    case BUILT_IN_RINDEX:
    case BUILT_IN_STRRCHR:
      return gimple_fold_builtin_strchr (gsi, true);
    case BUILT_IN_STRCMP:
    case BUILT_IN_STRCASECMP:
    case BUILT_IN_STRNCMP:
    case BUILT_IN_STRNCASECMP:
      return gimple_fold_builtin_string_compare (gsi);
    case BUILT_IN_MEMCHR:
      return gimple_fold_builtin_memchr (gsi);
    case BUILT_IN_FPUTS:
      return gimple_fold_builtin_fputs (gsi, gimple_call_arg (stmt, 0),
					gimple_call_arg (stmt, 1), false);
    case BUILT_IN_FPUTS_UNLOCKED:
      return gimple_fold_builtin_fputs (gsi, gimple_call_arg (stmt, 0),
					gimple_call_arg (stmt, 1), true);
    case BUILT_IN_MEMCPY_CHK:
    case BUILT_IN_MEMPCPY_CHK:
    case BUILT_IN_MEMMOVE_CHK:
    case BUILT_IN_MEMSET_CHK:
      return gimple_fold_builtin_memory_chk (gsi,
					     gimple_call_arg (stmt, 0),
					     gimple_call_arg (stmt, 1),
					     gimple_call_arg (stmt, 2),
					     gimple_call_arg (stmt, 3),
					     fcode);
    case BUILT_IN_STPCPY:
      return gimple_fold_builtin_stpcpy (gsi);
    case BUILT_IN_STRCPY_CHK:
    case BUILT_IN_STPCPY_CHK:
      return gimple_fold_builtin_stxcpy_chk (gsi,
					     gimple_call_arg (stmt, 0),
					     gimple_call_arg (stmt, 1),
					     gimple_call_arg (stmt, 2),
					     fcode);
    case BUILT_IN_STRNCPY_CHK:
    case BUILT_IN_STPNCPY_CHK:
      return gimple_fold_builtin_stxncpy_chk (gsi,
					      gimple_call_arg (stmt, 0),
					      gimple_call_arg (stmt, 1),
					      gimple_call_arg (stmt, 2),
					      gimple_call_arg (stmt, 3),
					      fcode);
    case BUILT_IN_SNPRINTF_CHK:
    case BUILT_IN_VSNPRINTF_CHK:
      return gimple_fold_builtin_snprintf_chk (gsi, fcode);
    case BUILT_IN_SNPRINTF:
      return gimple_fold_builtin_snprintf (gsi);
    case BUILT_IN_SPRINTF:
      return gimple_fold_builtin_sprintf (gsi);
    case BUILT_IN_FPRINTF:
    case BUILT_IN_FPRINTF_UNLOCKED:
    case BUILT_IN_VFPRINTF:
      if (n == 2 || n == 3)
	return gimple_fold_builtin_fprintf (gsi,
					    gimple_call_arg (stmt, 0),
					    gimple_call_arg (stmt, 1),
					    n == 3
					    ? gimple_call_arg (stmt, 2)
					    : NULL_TREE,
					    fcode);
      break;
    case BUILT_IN_FPRINTF_CHK:
    case BUILT_IN_VFPRINTF_CHK:
      if (n == 3 || n == 4)
	return gimple_fold_builtin_fprintf (gsi,
					    gimple_call_arg (stmt, 0),
					    gimple_call_arg (stmt, 2),
					    n == 4
					    ? gimple_call_arg (stmt, 3)
					    : NULL_TREE,
					    fcode);
      break;
    case BUILT_IN_PRINTF:
    case BUILT_IN_PRINTF_UNLOCKED:
    case BUILT_IN_VPRINTF:
      if (n == 1 || n == 2)
	return gimple_fold_builtin_printf (gsi, gimple_call_arg (stmt, 0),
					   n == 2
					   ? gimple_call_arg (stmt, 1)
					   : NULL_TREE, fcode);
      break;
    case BUILT_IN_PRINTF_CHK:
    case BUILT_IN_VPRINTF_CHK:
      if (n == 2 || n == 3)
	return gimple_fold_builtin_printf (gsi, gimple_call_arg (stmt, 1),
					   n == 3
					   ? gimple_call_arg (stmt, 2)
					   : NULL_TREE, fcode);
      break;
    case BUILT_IN_ACC_ON_DEVICE:
      return gimple_fold_builtin_acc_on_device (gsi,
						gimple_call_arg (stmt, 0));
    default:;
    }

  /* Try the generic builtin folder.  */
  bool ignore = (gimple_call_lhs (stmt) == NULL);
  tree result = fold_call_stmt (stmt, ignore);
  if (result)
    {
      if (ignore)
	STRIP_NOPS (result);
      else
	result = fold_convert (gimple_call_return_type (stmt), result);
      if (!update_call_from_tree (gsi, result))
	gimplify_and_update_call_from_tree (gsi, result);
      return true;
    }

  return false;
}

/* Transform IFN_GOACC_DIM_SIZE and IFN_GOACC_DIM_POS internal
   function calls to constants, where possible.  */

static tree
fold_internal_goacc_dim (const gimple *call)
{
  int axis = get_oacc_ifn_dim_arg (call);
  int size = get_oacc_fn_dim_size (current_function_decl, axis);
  bool is_pos = gimple_call_internal_fn (call) == IFN_GOACC_DIM_POS;
  tree result = NULL_TREE;

  /* If the size is 1, or we only want the size and it is not dynamic,
     we know the answer.  */
  if (size == 1 || (!is_pos && size))
    {
      tree type = TREE_TYPE (gimple_call_lhs (call));
      result = build_int_cst (type, size - is_pos);
    }

  return result;
}

/* Return true if stmt is __atomic_compare_exchange_N call which is suitable
   for conversion into ATOMIC_COMPARE_EXCHANGE if the second argument is
   &var where var is only addressable because of such calls.  */

bool
optimize_atomic_compare_exchange_p (gimple *stmt)
{
  if (gimple_call_num_args (stmt) != 6
      || !flag_inline_atomics
      || !optimize
      || (flag_sanitize & (SANITIZE_THREAD | SANITIZE_ADDRESS)) != 0
      || !gimple_call_builtin_p (stmt, BUILT_IN_NORMAL)
      || !gimple_vdef (stmt)
      || !gimple_vuse (stmt))
    return false;

  tree fndecl = gimple_call_fndecl (stmt);
  switch (DECL_FUNCTION_CODE (fndecl))
    {
    case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_1:
    case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_2:
    case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_4:
    case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_8:
    case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_16:
      break;
    default:
      return false;
    }

  tree expected = gimple_call_arg (stmt, 1);
  if (TREE_CODE (expected) != ADDR_EXPR
      || !SSA_VAR_P (TREE_OPERAND (expected, 0)))
    return false;

  tree etype = TREE_TYPE (TREE_OPERAND (expected, 0));
  if (!is_gimple_reg_type (etype)
      || !auto_var_in_fn_p (TREE_OPERAND (expected, 0), current_function_decl)
      || TREE_THIS_VOLATILE (etype)
      || VECTOR_TYPE_P (etype)
      || TREE_CODE (etype) == COMPLEX_TYPE
      /* Don't optimize floating point expected vars, VIEW_CONVERT_EXPRs
	 might not preserve all the bits.  See PR71716.  */
      || SCALAR_FLOAT_TYPE_P (etype)
      || TYPE_PRECISION (etype) != GET_MODE_BITSIZE (TYPE_MODE (etype)))
    return false;

  tree weak = gimple_call_arg (stmt, 3);
  if (!integer_zerop (weak) && !integer_onep (weak))
    return false;

  tree parmt = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
  tree itype = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (parmt)));
  machine_mode mode = TYPE_MODE (itype);

  if (direct_optab_handler (atomic_compare_and_swap_optab, mode)
      == CODE_FOR_nothing
      && optab_handler (sync_compare_and_swap_optab, mode) == CODE_FOR_nothing)
    return false;

  if (int_size_in_bytes (etype) != GET_MODE_SIZE (mode))
    return false;

  return true;
}

/* Fold
     r = __atomic_compare_exchange_N (p, &e, d, w, s, f);
   into
     _Complex uintN_t t = ATOMIC_COMPARE_EXCHANGE (p, e, d, w * 256 + N, s, f);
     i = IMAGPART_EXPR <t>;
     r = (_Bool) i;
     e = REALPART_EXPR <t>;  */

void
fold_builtin_atomic_compare_exchange (gimple_stmt_iterator *gsi)
{
  gimple *stmt = gsi_stmt (*gsi);
  tree fndecl = gimple_call_fndecl (stmt);
  tree parmt = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
  tree itype = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (parmt)));
  tree ctype = build_complex_type (itype);
  tree expected = TREE_OPERAND (gimple_call_arg (stmt, 1), 0);
  gimple *g = gimple_build_assign (make_ssa_name (TREE_TYPE (expected)),
				   expected);
  gsi_insert_before (gsi, g, GSI_SAME_STMT);
  gimple_stmt_iterator gsiret = gsi_for_stmt (g);
  if (!useless_type_conversion_p (itype, TREE_TYPE (expected)))
    {
      g = gimple_build_assign (make_ssa_name (itype), VIEW_CONVERT_EXPR,
			       build1 (VIEW_CONVERT_EXPR, itype,
				       gimple_assign_lhs (g)));
      gsi_insert_before (gsi, g, GSI_SAME_STMT);
    }
  int flag = (integer_onep (gimple_call_arg (stmt, 3)) ? 256 : 0)
	     + int_size_in_bytes (itype);
  g = gimple_build_call_internal (IFN_ATOMIC_COMPARE_EXCHANGE, 6,
				  gimple_call_arg (stmt, 0),
				  gimple_assign_lhs (g),
				  gimple_call_arg (stmt, 2),
				  build_int_cst (integer_type_node, flag),
				  gimple_call_arg (stmt, 4),
				  gimple_call_arg (stmt, 5));
  tree lhs = make_ssa_name (ctype);
  gimple_call_set_lhs (g, lhs);
  gimple_set_vdef (g, gimple_vdef (stmt));
  gimple_set_vuse (g, gimple_vuse (stmt));
  SSA_NAME_DEF_STMT (gimple_vdef (g)) = g;
  if (gimple_call_lhs (stmt))
    {
      gsi_insert_before (gsi, g, GSI_SAME_STMT);
      g = gimple_build_assign (make_ssa_name (itype), IMAGPART_EXPR,
			       build1 (IMAGPART_EXPR, itype, lhs));
      gsi_insert_before (gsi, g, GSI_SAME_STMT);
      g = gimple_build_assign (gimple_call_lhs (stmt), NOP_EXPR,
			       gimple_assign_lhs (g));
    }
  gsi_replace (gsi, g, true);
  g = gimple_build_assign (make_ssa_name (itype), REALPART_EXPR,
			   build1 (REALPART_EXPR, itype, lhs));
  gsi_insert_after (gsi, g, GSI_NEW_STMT);
  if (!useless_type_conversion_p (TREE_TYPE (expected), itype))
    {
      g = gimple_build_assign (make_ssa_name (TREE_TYPE (expected)),
			       VIEW_CONVERT_EXPR,
			       build1 (VIEW_CONVERT_EXPR, TREE_TYPE (expected),
				       gimple_assign_lhs (g)));
      gsi_insert_after (gsi, g, GSI_NEW_STMT);
    }
  g = gimple_build_assign (expected, SSA_NAME, gimple_assign_lhs (g));
  gsi_insert_after (gsi, g, GSI_NEW_STMT);
  *gsi = gsiret;
}

/* Return true if ARG0 CODE ARG1 in infinite signed precision operation
   doesn't fit into TYPE.  The test for overflow should be regardless of
   -fwrapv, and even for unsigned types.  */

bool
arith_overflowed_p (enum tree_code code, const_tree type,
		    const_tree arg0, const_tree arg1)
{
  typedef FIXED_WIDE_INT (WIDE_INT_MAX_PRECISION * 2) widest2_int;
  typedef generic_wide_int <wi::extended_tree <WIDE_INT_MAX_PRECISION * 2> >
    widest2_int_cst;
  widest2_int warg0 = widest2_int_cst (arg0);
  widest2_int warg1 = widest2_int_cst (arg1);
  widest2_int wres;
  switch (code)
    {
    case PLUS_EXPR: wres = wi::add (warg0, warg1); break;
    case MINUS_EXPR: wres = wi::sub (warg0, warg1); break;
    case MULT_EXPR: wres = wi::mul (warg0, warg1); break;
    default: gcc_unreachable ();
    }
  signop sign = TYPE_SIGN (type);
  if (sign == UNSIGNED && wi::neg_p (wres))
    return true;
  return wi::min_precision (wres, sign) > TYPE_PRECISION (type);
}

/* Attempt to fold a call statement referenced by the statement iterator GSI.
   The statement may be replaced by another statement, e.g., if the call
   simplifies to a constant value. Return true if any changes were made.
   It is assumed that the operands have been previously folded.  */

static bool
gimple_fold_call (gimple_stmt_iterator *gsi, bool inplace)
{
  gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi));
  tree callee;
  bool changed = false;
  unsigned i;

  /* Fold *& in call arguments.  */
  for (i = 0; i < gimple_call_num_args (stmt); ++i)
    if (REFERENCE_CLASS_P (gimple_call_arg (stmt, i)))
      {
	tree tmp = maybe_fold_reference (gimple_call_arg (stmt, i), false);
	if (tmp)
	  {
	    gimple_call_set_arg (stmt, i, tmp);
	    changed = true;
	  }
      }

  /* Check for virtual calls that became direct calls.  */
  callee = gimple_call_fn (stmt);
  if (callee && TREE_CODE (callee) == OBJ_TYPE_REF)
    {
      if (gimple_call_addr_fndecl (OBJ_TYPE_REF_EXPR (callee)) != NULL_TREE)
	{
          if (dump_file && virtual_method_call_p (callee)
	      && !possible_polymorphic_call_target_p
		    (callee, stmt, cgraph_node::get (gimple_call_addr_fndecl
						     (OBJ_TYPE_REF_EXPR (callee)))))
	    {
	      fprintf (dump_file,
		       "Type inheritance inconsistent devirtualization of ");
	      print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM);
	      fprintf (dump_file, " to ");
	      print_generic_expr (dump_file, callee, TDF_SLIM);
	      fprintf (dump_file, "\n");
	    }

	  gimple_call_set_fn (stmt, OBJ_TYPE_REF_EXPR (callee));
	  changed = true;
	}
      else if (flag_devirtualize && !inplace && virtual_method_call_p (callee))
	{
	  bool final;
	  vec <cgraph_node *>targets
	    = possible_polymorphic_call_targets (callee, stmt, &final);
	  if (final && targets.length () <= 1 && dbg_cnt (devirt))
	    {
	      tree lhs = gimple_call_lhs (stmt);
	      if (dump_enabled_p ())
		{
		  location_t loc = gimple_location_safe (stmt);
		  dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, loc,
				   "folding virtual function call to %s\n",
		 		   targets.length () == 1
		  		   ? targets[0]->name ()
		  		   : "__builtin_unreachable");
		}
	      if (targets.length () == 1)
		{
		  tree fndecl = targets[0]->decl;
		  gimple_call_set_fndecl (stmt, fndecl);
		  changed = true;
		  /* If changing the call to __cxa_pure_virtual
		     or similar noreturn function, adjust gimple_call_fntype
		     too.  */
		  if (gimple_call_noreturn_p (stmt)
		      && VOID_TYPE_P (TREE_TYPE (TREE_TYPE (fndecl)))
		      && TYPE_ARG_TYPES (TREE_TYPE (fndecl))
		      && (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
			  == void_type_node))
		    gimple_call_set_fntype (stmt, TREE_TYPE (fndecl));
		  /* If the call becomes noreturn, remove the lhs.  */
		  if (lhs
		      && gimple_call_noreturn_p (stmt)
		      && (VOID_TYPE_P (TREE_TYPE (gimple_call_fntype (stmt)))
			  || should_remove_lhs_p (lhs)))
		    {
		      if (TREE_CODE (lhs) == SSA_NAME)
			{
			  tree var = create_tmp_var (TREE_TYPE (lhs));
			  tree def = get_or_create_ssa_default_def (cfun, var);
			  gimple *new_stmt = gimple_build_assign (lhs, def);
			  gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT);
			}
		      gimple_call_set_lhs (stmt, NULL_TREE);
		    }
		  maybe_remove_unused_call_args (cfun, stmt);
		}
	      else
		{
		  tree fndecl = builtin_decl_implicit (BUILT_IN_UNREACHABLE);
		  gimple *new_stmt = gimple_build_call (fndecl, 0);
		  gimple_set_location (new_stmt, gimple_location (stmt));
		  if (lhs && TREE_CODE (lhs) == SSA_NAME)
		    {
		      tree var = create_tmp_var (TREE_TYPE (lhs));
		      tree def = get_or_create_ssa_default_def (cfun, var);

		      /* To satisfy condition for
			 cgraph_update_edges_for_call_stmt_node,
			 we need to preserve GIMPLE_CALL statement
			 at position of GSI iterator.  */
		      update_call_from_tree (gsi, def);
		      gsi_insert_before (gsi, new_stmt, GSI_NEW_STMT);
		    }
		  else
		    {
		      gimple_set_vuse (new_stmt, gimple_vuse (stmt));
		      gimple_set_vdef (new_stmt, gimple_vdef (stmt));
		      gsi_replace (gsi, new_stmt, false);
		    }
		  return true;
		}
	    }
	}
    }

  /* Check for indirect calls that became direct calls, and then
     no longer require a static chain.  */
  if (gimple_call_chain (stmt))
    {
      tree fn = gimple_call_fndecl (stmt);
      if (fn && !DECL_STATIC_CHAIN (fn))
	{
	  gimple_call_set_chain (stmt, NULL);
	  changed = true;
	}
      else
	{
	  tree tmp = maybe_fold_reference (gimple_call_chain (stmt), false);
	  if (tmp)
	    {
	      gimple_call_set_chain (stmt, tmp);
	      changed = true;
	    }
	}
    }

  if (inplace)
    return changed;

  /* Check for builtins that CCP can handle using information not
     available in the generic fold routines.  */
  if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
    {
      if (gimple_fold_builtin (gsi))
        changed = true;
    }
  else if (gimple_call_builtin_p (stmt, BUILT_IN_MD))
    {
	changed |= targetm.gimple_fold_builtin (gsi);
    }
  else if (gimple_call_internal_p (stmt))
    {
      enum tree_code subcode = ERROR_MARK;
      tree result = NULL_TREE;
      bool cplx_result = false;
      tree overflow = NULL_TREE;
      switch (gimple_call_internal_fn (stmt))
	{
	case IFN_BUILTIN_EXPECT:
	  result = fold_builtin_expect (gimple_location (stmt),
					gimple_call_arg (stmt, 0),
					gimple_call_arg (stmt, 1),
					gimple_call_arg (stmt, 2));
	  break;
	case IFN_UBSAN_OBJECT_SIZE:
	  if (integer_all_onesp (gimple_call_arg (stmt, 2))
	      || (TREE_CODE (gimple_call_arg (stmt, 1)) == INTEGER_CST
		  && TREE_CODE (gimple_call_arg (stmt, 2)) == INTEGER_CST
		  && tree_int_cst_le (gimple_call_arg (stmt, 1),
				      gimple_call_arg (stmt, 2))))
	    {
	      gsi_replace (gsi, gimple_build_nop (), false);
	      unlink_stmt_vdef (stmt);
	      release_defs (stmt);
	      return true;
	    }
	  break;
	case IFN_GOACC_DIM_SIZE:
	case IFN_GOACC_DIM_POS:
	  result = fold_internal_goacc_dim (stmt);
	  break;
	case IFN_UBSAN_CHECK_ADD:
	  subcode = PLUS_EXPR;
	  break;
	case IFN_UBSAN_CHECK_SUB:
	  subcode = MINUS_EXPR;
	  break;
	case IFN_UBSAN_CHECK_MUL:
	  subcode = MULT_EXPR;
	  break;
	case IFN_ADD_OVERFLOW:
	  subcode = PLUS_EXPR;
	  cplx_result = true;
	  break;
	case IFN_SUB_OVERFLOW:
	  subcode = MINUS_EXPR;
	  cplx_result = true;
	  break;
	case IFN_MUL_OVERFLOW:
	  subcode = MULT_EXPR;
	  cplx_result = true;
	  break;
	default:
	  break;
	}
      if (subcode != ERROR_MARK)
	{
	  tree arg0 = gimple_call_arg (stmt, 0);
	  tree arg1 = gimple_call_arg (stmt, 1);
	  tree type = TREE_TYPE (arg0);
	  if (cplx_result)
	    {
	      tree lhs = gimple_call_lhs (stmt);
	      if (lhs == NULL_TREE)
		type = NULL_TREE;
	      else
		type = TREE_TYPE (TREE_TYPE (lhs));
	    }
	  if (type == NULL_TREE)
	    ;
	  /* x = y + 0; x = y - 0; x = y * 0; */
	  else if (integer_zerop (arg1))
	    result = subcode == MULT_EXPR ? integer_zero_node : arg0;
	  /* x = 0 + y; x = 0 * y; */
	  else if (subcode != MINUS_EXPR && integer_zerop (arg0))
	    result = subcode == MULT_EXPR ? integer_zero_node : arg1;
	  /* x = y - y; */
	  else if (subcode == MINUS_EXPR && operand_equal_p (arg0, arg1, 0))
	    result = integer_zero_node;
	  /* x = y * 1; x = 1 * y; */
	  else if (subcode == MULT_EXPR && integer_onep (arg1))
	    result = arg0;
	  else if (subcode == MULT_EXPR && integer_onep (arg0))
	    result = arg1;
	  else if (TREE_CODE (arg0) == INTEGER_CST
		   && TREE_CODE (arg1) == INTEGER_CST)
	    {
	      if (cplx_result)
		result = int_const_binop (subcode, fold_convert (type, arg0),
					  fold_convert (type, arg1));
	      else
		result = int_const_binop (subcode, arg0, arg1);
	      if (result && arith_overflowed_p (subcode, type, arg0, arg1))
		{
		  if (cplx_result)
		    overflow = build_one_cst (type);
		  else
		    result = NULL_TREE;
		}
	    }
	  if (result)
	    {
	      if (result == integer_zero_node)
		result = build_zero_cst (type);
	      else if (cplx_result && TREE_TYPE (result) != type)
		{
		  if (TREE_CODE (result) == INTEGER_CST)
		    {
		      if (arith_overflowed_p (PLUS_EXPR, type, result,
					      integer_zero_node))
			overflow = build_one_cst (type);
		    }
		  else if ((!TYPE_UNSIGNED (TREE_TYPE (result))
			    && TYPE_UNSIGNED (type))
			   || (TYPE_PRECISION (type)
			       < (TYPE_PRECISION (TREE_TYPE (result))
				  + (TYPE_UNSIGNED (TREE_TYPE (result))
				     && !TYPE_UNSIGNED (type)))))
		    result = NULL_TREE;
		  if (result)
		    result = fold_convert (type, result);
		}
	    }
	}

      if (result)
	{
	  if (TREE_CODE (result) == INTEGER_CST && TREE_OVERFLOW (result))
	    result = drop_tree_overflow (result);
	  if (cplx_result)
	    {
	      if (overflow == NULL_TREE)
		overflow = build_zero_cst (TREE_TYPE (result));
	      tree ctype = build_complex_type (TREE_TYPE (result));
	      if (TREE_CODE (result) == INTEGER_CST
		  && TREE_CODE (overflow) == INTEGER_CST)
		result = build_complex (ctype, result, overflow);
	      else
		result = build2_loc (gimple_location (stmt), COMPLEX_EXPR,
				     ctype, result, overflow);
	    }
	  if (!update_call_from_tree (gsi, result))
	    gimplify_and_update_call_from_tree (gsi, result);
	  changed = true;
	}
    }

  return changed;
}


/* Return true whether NAME has a use on STMT.  */

static bool
has_use_on_stmt (tree name, gimple *stmt)
{
  imm_use_iterator iter;
  use_operand_p use_p;
  FOR_EACH_IMM_USE_FAST (use_p, iter, name)
    if (USE_STMT (use_p) == stmt)
      return true;
  return false;
}

/* Worker for fold_stmt_1 dispatch to pattern based folding with
   gimple_simplify.

   Replaces *GSI with the simplification result in RCODE and OPS
   and the associated statements in *SEQ.  Does the replacement
   according to INPLACE and returns true if the operation succeeded.  */

static bool
replace_stmt_with_simplification (gimple_stmt_iterator *gsi,
				  code_helper rcode, tree *ops,
				  gimple_seq *seq, bool inplace)
{
  gimple *stmt = gsi_stmt (*gsi);

  /* Play safe and do not allow abnormals to be mentioned in
     newly created statements.  See also maybe_push_res_to_seq.
     As an exception allow such uses if there was a use of the
     same SSA name on the old stmt.  */
  if ((TREE_CODE (ops[0]) == SSA_NAME
       && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ops[0])
       && !has_use_on_stmt (ops[0], stmt))
      || (ops[1]
	  && TREE_CODE (ops[1]) == SSA_NAME
	  && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ops[1])
	  && !has_use_on_stmt (ops[1], stmt))
      || (ops[2]
	  && TREE_CODE (ops[2]) == SSA_NAME
	  && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ops[2])
	  && !has_use_on_stmt (ops[2], stmt))
      || (COMPARISON_CLASS_P (ops[0])
	  && ((TREE_CODE (TREE_OPERAND (ops[0], 0)) == SSA_NAME
	       && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (TREE_OPERAND (ops[0], 0))
	       && !has_use_on_stmt (TREE_OPERAND (ops[0], 0), stmt))
	      || (TREE_CODE (TREE_OPERAND (ops[0], 1)) == SSA_NAME
		  && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (TREE_OPERAND (ops[0], 1))
		  && !has_use_on_stmt (TREE_OPERAND (ops[0], 1), stmt)))))
    return false;

  /* Don't insert new statements when INPLACE is true, even if we could
     reuse STMT for the final statement.  */
  if (inplace && !gimple_seq_empty_p (*seq))
    return false;

  if (gcond *cond_stmt = dyn_cast <gcond *> (stmt))
    {
      gcc_assert (rcode.is_tree_code ());
      if (TREE_CODE_CLASS ((enum tree_code)rcode) == tcc_comparison
	  /* GIMPLE_CONDs condition may not throw.  */
	  && (!flag_exceptions
	      || !cfun->can_throw_non_call_exceptions
	      || !operation_could_trap_p (rcode,
					  FLOAT_TYPE_P (TREE_TYPE (ops[0])),
					  false, NULL_TREE)))
	gimple_cond_set_condition (cond_stmt, rcode, ops[0], ops[1]);
      else if (rcode == SSA_NAME)
	gimple_cond_set_condition (cond_stmt, NE_EXPR, ops[0],
				   build_zero_cst (TREE_TYPE (ops[0])));
      else if (rcode == INTEGER_CST)
	{
	  if (integer_zerop (ops[0]))
	    gimple_cond_make_false (cond_stmt);
	  else
	    gimple_cond_make_true (cond_stmt);
	}
      else if (!inplace)
	{
	  tree res = maybe_push_res_to_seq (rcode, boolean_type_node,
					    ops, seq);
	  if (!res)
	    return false;
	  gimple_cond_set_condition (cond_stmt, NE_EXPR, res,
				     build_zero_cst (TREE_TYPE (res)));
	}
      else
	return false;
      if (dump_file && (dump_flags & TDF_DETAILS))
	{
	  fprintf (dump_file, "gimple_simplified to ");
	  if (!gimple_seq_empty_p (*seq))
	    print_gimple_seq (dump_file, *seq, 0, TDF_SLIM);
	  print_gimple_stmt (dump_file, gsi_stmt (*gsi),
			     0, TDF_SLIM);
	}
      gsi_insert_seq_before (gsi, *seq, GSI_SAME_STMT);
      return true;
    }
  else if (is_gimple_assign (stmt)
	   && rcode.is_tree_code ())
    {
      if (!inplace
	  || gimple_num_ops (stmt) > get_gimple_rhs_num_ops (rcode))
	{
	  maybe_build_generic_op (rcode,
				  TREE_TYPE (gimple_assign_lhs (stmt)), ops);
	  gimple_assign_set_rhs_with_ops (gsi, rcode, ops[0], ops[1], ops[2]);
	  if (dump_file && (dump_flags & TDF_DETAILS))
	    {
	      fprintf (dump_file, "gimple_simplified to ");
	      if (!gimple_seq_empty_p (*seq))
		print_gimple_seq (dump_file, *seq, 0, TDF_SLIM);
	      print_gimple_stmt (dump_file, gsi_stmt (*gsi),
				 0, TDF_SLIM);
	    }
	  gsi_insert_seq_before (gsi, *seq, GSI_SAME_STMT);
	  return true;
	}
    }
  else if (rcode.is_fn_code ()
	   && gimple_call_combined_fn (stmt) == rcode)
    {
      unsigned i;
      for (i = 0; i < gimple_call_num_args (stmt); ++i)
	{
	  gcc_assert (ops[i] != NULL_TREE);
	  gimple_call_set_arg (stmt, i, ops[i]);
	}
      if (i < 3)
	gcc_assert (ops[i] == NULL_TREE);
      if (dump_file && (dump_flags & TDF_DETAILS))
	{
	  fprintf (dump_file, "gimple_simplified to ");
	  if (!gimple_seq_empty_p (*seq))
	    print_gimple_seq (dump_file, *seq, 0, TDF_SLIM);
	  print_gimple_stmt (dump_file, gsi_stmt (*gsi), 0, TDF_SLIM);
	}
      gsi_insert_seq_before (gsi, *seq, GSI_SAME_STMT);
      return true;
    }
  else if (!inplace)
    {
      if (gimple_has_lhs (stmt))
	{
	  tree lhs = gimple_get_lhs (stmt);
	  if (!maybe_push_res_to_seq (rcode, TREE_TYPE (lhs),
				      ops, seq, lhs))
	    return false;
	  if (dump_file && (dump_flags & TDF_DETAILS))
	    {
	      fprintf (dump_file, "gimple_simplified to ");
	      print_gimple_seq (dump_file, *seq, 0, TDF_SLIM);
	    }
	  gsi_replace_with_seq_vops (gsi, *seq);
	  return true;
	}
      else
	gcc_unreachable ();
    }

  return false;
}

/* Canonicalize MEM_REFs invariant address operand after propagation.  */

static bool
maybe_canonicalize_mem_ref_addr (tree *t)
{
  bool res = false;

  if (TREE_CODE (*t) == ADDR_EXPR)
    t = &TREE_OPERAND (*t, 0);

  /* The C and C++ frontends use an ARRAY_REF for indexing with their
     generic vector extension.  The actual vector referenced is
     view-converted to an array type for this purpose.  If the index
     is constant the canonical representation in the middle-end is a
     BIT_FIELD_REF so re-write the former to the latter here.  */
  if (TREE_CODE (*t) == ARRAY_REF
      && TREE_CODE (TREE_OPERAND (*t, 0)) == VIEW_CONVERT_EXPR
      && TREE_CODE (TREE_OPERAND (*t, 1)) == INTEGER_CST
      && VECTOR_TYPE_P (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (*t, 0), 0))))
    {
      tree vtype = TREE_TYPE (TREE_OPERAND (TREE_OPERAND (*t, 0), 0));
      if (VECTOR_TYPE_P (vtype))
	{
	  tree low = array_ref_low_bound (*t);
	  if (TREE_CODE (low) == INTEGER_CST)
	    {
	      if (tree_int_cst_le (low, TREE_OPERAND (*t, 1)))
		{
		  widest_int idx = wi::sub (wi::to_widest (TREE_OPERAND (*t, 1)),
					    wi::to_widest (low));
		  idx = wi::mul (idx, wi::to_widest
					 (TYPE_SIZE (TREE_TYPE (*t))));
		  widest_int ext
		    = wi::add (idx, wi::to_widest (TYPE_SIZE (TREE_TYPE (*t))));
		  if (wi::les_p (ext, wi::to_widest (TYPE_SIZE (vtype))))
		    {
		      *t = build3_loc (EXPR_LOCATION (*t), BIT_FIELD_REF,
				       TREE_TYPE (*t),
				       TREE_OPERAND (TREE_OPERAND (*t, 0), 0),
				       TYPE_SIZE (TREE_TYPE (*t)),
				       wide_int_to_tree (sizetype, idx));
		      res = true;
		    }
		}
	    }
	}
    }

  while (handled_component_p (*t))
    t = &TREE_OPERAND (*t, 0);

  /* Canonicalize MEM [&foo.bar, 0] which appears after propagating
     of invariant addresses into a SSA name MEM_REF address.  */
  if (TREE_CODE (*t) == MEM_REF
      || TREE_CODE (*t) == TARGET_MEM_REF)
    {
      tree addr = TREE_OPERAND (*t, 0);
      if (TREE_CODE (addr) == ADDR_EXPR
	  && (TREE_CODE (TREE_OPERAND (addr, 0)) == MEM_REF
	      || handled_component_p (TREE_OPERAND (addr, 0))))
	{
	  tree base;
	  HOST_WIDE_INT coffset;
	  base = get_addr_base_and_unit_offset (TREE_OPERAND (addr, 0),
						&coffset);
	  if (!base)
	    gcc_unreachable ();

	  TREE_OPERAND (*t, 0) = build_fold_addr_expr (base);
	  TREE_OPERAND (*t, 1) = int_const_binop (PLUS_EXPR,
						  TREE_OPERAND (*t, 1),
						  size_int (coffset));
	  res = true;
	}
      gcc_checking_assert (TREE_CODE (TREE_OPERAND (*t, 0)) == DEBUG_EXPR_DECL
			   || is_gimple_mem_ref_addr (TREE_OPERAND (*t, 0)));
    }

  /* Canonicalize back MEM_REFs to plain reference trees if the object
     accessed is a decl that has the same access semantics as the MEM_REF.  */
  if (TREE_CODE (*t) == MEM_REF
      && TREE_CODE (TREE_OPERAND (*t, 0)) == ADDR_EXPR
      && integer_zerop (TREE_OPERAND (*t, 1))
      && MR_DEPENDENCE_CLIQUE (*t) == 0)
    {
      tree decl = TREE_OPERAND (TREE_OPERAND (*t, 0), 0);
      tree alias_type = TREE_TYPE (TREE_OPERAND (*t, 1));
      if (/* Same volatile qualification.  */
	  TREE_THIS_VOLATILE (*t) == TREE_THIS_VOLATILE (decl)
	  /* Same TBAA behavior with -fstrict-aliasing.  */
	  && !TYPE_REF_CAN_ALIAS_ALL (alias_type)
	  && (TYPE_MAIN_VARIANT (TREE_TYPE (decl))
	      == TYPE_MAIN_VARIANT (TREE_TYPE (alias_type)))
	  /* Same alignment.  */
	  && TYPE_ALIGN (TREE_TYPE (decl)) == TYPE_ALIGN (TREE_TYPE (*t))
	  /* We have to look out here to not drop a required conversion
	     from the rhs to the lhs if *t appears on the lhs or vice-versa
	     if it appears on the rhs.  Thus require strict type
	     compatibility.  */
	  && types_compatible_p (TREE_TYPE (*t), TREE_TYPE (decl)))
	{
	  *t = TREE_OPERAND (TREE_OPERAND (*t, 0), 0);
	  res = true;
	}
    }

  /* Canonicalize TARGET_MEM_REF in particular with respect to
     the indexes becoming constant.  */
  else if (TREE_CODE (*t) == TARGET_MEM_REF)
    {
      tree tem = maybe_fold_tmr (*t);
      if (tem)
	{
	  *t = tem;
	  res = true;
	}
    }

  return res;
}

/* Worker for both fold_stmt and fold_stmt_inplace.  The INPLACE argument
   distinguishes both cases.  */

static bool
fold_stmt_1 (gimple_stmt_iterator *gsi, bool inplace, tree (*valueize) (tree))
{
  bool changed = false;
  gimple *stmt = gsi_stmt (*gsi);
  bool nowarning = gimple_no_warning_p (stmt);
  unsigned i;
  fold_defer_overflow_warnings ();

  /* First do required canonicalization of [TARGET_]MEM_REF addresses
     after propagation.
     ???  This shouldn't be done in generic folding but in the
     propagation helpers which also know whether an address was
     propagated.
     Also canonicalize operand order.  */
  switch (gimple_code (stmt))
    {
    case GIMPLE_ASSIGN:
      if (gimple_assign_rhs_class (stmt) == GIMPLE_SINGLE_RHS)
	{
	  tree *rhs = gimple_assign_rhs1_ptr (stmt);
	  if ((REFERENCE_CLASS_P (*rhs)
	       || TREE_CODE (*rhs) == ADDR_EXPR)
	      && maybe_canonicalize_mem_ref_addr (rhs))
	    changed = true;
	  tree *lhs = gimple_assign_lhs_ptr (stmt);
	  if (REFERENCE_CLASS_P (*lhs)
	      && maybe_canonicalize_mem_ref_addr (lhs))
	    changed = true;
	}
      else
	{
	  /* Canonicalize operand order.  */
	  enum tree_code code = gimple_assign_rhs_code (stmt);
	  if (TREE_CODE_CLASS (code) == tcc_comparison
	      || commutative_tree_code (code)
	      || commutative_ternary_tree_code (code))
	    {
	      tree rhs1 = gimple_assign_rhs1 (stmt);
	      tree rhs2 = gimple_assign_rhs2 (stmt);
	      if (tree_swap_operands_p (rhs1, rhs2, false))
		{
		  gimple_assign_set_rhs1 (stmt, rhs2);
		  gimple_assign_set_rhs2 (stmt, rhs1);
		  if (TREE_CODE_CLASS (code) == tcc_comparison)
		    gimple_assign_set_rhs_code (stmt,
						swap_tree_comparison (code));
		  changed = true;
		}
	    }
	}
      break;
    case GIMPLE_CALL:
      {
	for (i = 0; i < gimple_call_num_args (stmt); ++i)
	  {
	    tree *arg = gimple_call_arg_ptr (stmt, i);
	    if (REFERENCE_CLASS_P (*arg)
		&& maybe_canonicalize_mem_ref_addr (arg))
	      changed = true;
	  }
	tree *lhs = gimple_call_lhs_ptr (stmt);
	if (*lhs
	    && REFERENCE_CLASS_P (*lhs)
	    && maybe_canonicalize_mem_ref_addr (lhs))
	  changed = true;
	break;
      }
    case GIMPLE_ASM:
      {
	gasm *asm_stmt = as_a <gasm *> (stmt);
	for (i = 0; i < gimple_asm_noutputs (asm_stmt); ++i)
	  {
	    tree link = gimple_asm_output_op (asm_stmt, i);
	    tree op = TREE_VALUE (link);
	    if (REFERENCE_CLASS_P (op)
		&& maybe_canonicalize_mem_ref_addr (&TREE_VALUE (link)))
	      changed = true;
	  }
	for (i = 0; i < gimple_asm_ninputs (asm_stmt); ++i)
	  {
	    tree link = gimple_asm_input_op (asm_stmt, i);
	    tree op = TREE_VALUE (link);
	    if ((REFERENCE_CLASS_P (op)
		 || TREE_CODE (op) == ADDR_EXPR)
		&& maybe_canonicalize_mem_ref_addr (&TREE_VALUE (link)))
	      changed = true;
	  }
      }
      break;
    case GIMPLE_DEBUG:
      if (gimple_debug_bind_p (stmt))
	{
	  tree *val = gimple_debug_bind_get_value_ptr (stmt);
	  if (*val
	      && (REFERENCE_CLASS_P (*val)
		  || TREE_CODE (*val) == ADDR_EXPR)
	      && maybe_canonicalize_mem_ref_addr (val))
	    changed = true;
	}
      break;
    case GIMPLE_COND:
      {
	/* Canonicalize operand order.  */
	tree lhs = gimple_cond_lhs (stmt);
	tree rhs = gimple_cond_rhs (stmt);
	if (tree_swap_operands_p (lhs, rhs, false))
	  {
	    gcond *gc = as_a <gcond *> (stmt);
	    gimple_cond_set_lhs (gc, rhs);
	    gimple_cond_set_rhs (gc, lhs);
	    gimple_cond_set_code (gc,
				  swap_tree_comparison (gimple_cond_code (gc)));
	    changed = true;
	  }
      }
    default:;
    }

  /* Dispatch to pattern-based folding.  */
  if (!inplace
      || is_gimple_assign (stmt)
      || gimple_code (stmt) == GIMPLE_COND)
    {
      gimple_seq seq = NULL;
      code_helper rcode;
      tree ops[3] = {};
      if (gimple_simplify (stmt, &rcode, ops, inplace ? NULL : &seq,
			   valueize, valueize))
	{
	  if (replace_stmt_with_simplification (gsi, rcode, ops, &seq, inplace))
	    changed = true;
	  else
	    gimple_seq_discard (seq);
	}
    }

  stmt = gsi_stmt (*gsi);

  /* Fold the main computation performed by the statement.  */
  switch (gimple_code (stmt))
    {
    case GIMPLE_ASSIGN:
      {
	/* Try to canonicalize for boolean-typed X the comparisons
	   X == 0, X == 1, X != 0, and X != 1.  */
	if (gimple_assign_rhs_code (stmt) == EQ_EXPR
	    || gimple_assign_rhs_code (stmt) == NE_EXPR)
	  {
	    tree lhs = gimple_assign_lhs (stmt);
	    tree op1 = gimple_assign_rhs1 (stmt);
	    tree op2 = gimple_assign_rhs2 (stmt);
	    tree type = TREE_TYPE (op1);

	    /* Check whether the comparison operands are of the same boolean
	       type as the result type is.
	       Check that second operand is an integer-constant with value
	       one or zero.  */
	    if (TREE_CODE (op2) == INTEGER_CST
		&& (integer_zerop (op2) || integer_onep (op2))
		&& useless_type_conversion_p (TREE_TYPE (lhs), type))
	      {
		enum tree_code cmp_code = gimple_assign_rhs_code (stmt);
		bool is_logical_not = false;

		/* X == 0 and X != 1 is a logical-not.of X
		   X == 1 and X != 0 is X  */
		if ((cmp_code == EQ_EXPR && integer_zerop (op2))
		    || (cmp_code == NE_EXPR && integer_onep (op2)))
		  is_logical_not = true;

		if (is_logical_not == false)
		  gimple_assign_set_rhs_with_ops (gsi, TREE_CODE (op1), op1);
		/* Only for one-bit precision typed X the transformation
		   !X -> ~X is valied.  */
		else if (TYPE_PRECISION (type) == 1)
		  gimple_assign_set_rhs_with_ops (gsi, BIT_NOT_EXPR, op1);
		/* Otherwise we use !X -> X ^ 1.  */
		else
		  gimple_assign_set_rhs_with_ops (gsi, BIT_XOR_EXPR, op1,
						  build_int_cst (type, 1));
		changed = true;
		break;
	      }
	  }

	unsigned old_num_ops = gimple_num_ops (stmt);
	tree lhs = gimple_assign_lhs (stmt);
	tree new_rhs = fold_gimple_assign (gsi);
	if (new_rhs
	    && !useless_type_conversion_p (TREE_TYPE (lhs),
					   TREE_TYPE (new_rhs)))
	  new_rhs = fold_convert (TREE_TYPE (lhs), new_rhs);
	if (new_rhs
	    && (!inplace
		|| get_gimple_rhs_num_ops (TREE_CODE (new_rhs)) < old_num_ops))
	  {
	    gimple_assign_set_rhs_from_tree (gsi, new_rhs);
	    changed = true;
	  }
	break;
      }

    case GIMPLE_CALL:
      changed |= gimple_fold_call (gsi, inplace);
      break;

    case GIMPLE_ASM:
      /* Fold *& in asm operands.  */
      {
	gasm *asm_stmt = as_a <gasm *> (stmt);
	size_t noutputs;
	const char **oconstraints;
	const char *constraint;
	bool allows_mem, allows_reg;

	noutputs = gimple_asm_noutputs (asm_stmt);
	oconstraints = XALLOCAVEC (const char *, noutputs);

	for (i = 0; i < gimple_asm_noutputs (asm_stmt); ++i)
	  {
	    tree link = gimple_asm_output_op (asm_stmt, i);
	    tree op = TREE_VALUE (link);
	    oconstraints[i]
	      = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
	    if (REFERENCE_CLASS_P (op)
		&& (op = maybe_fold_reference (op, true)) != NULL_TREE)
	      {
		TREE_VALUE (link) = op;
		changed = true;
	      }
	  }
	for (i = 0; i < gimple_asm_ninputs (asm_stmt); ++i)
	  {
	    tree link = gimple_asm_input_op (asm_stmt, i);
	    tree op = TREE_VALUE (link);
	    constraint
	      = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
	    parse_input_constraint (&constraint, 0, 0, noutputs, 0,
				    oconstraints, &allows_mem, &allows_reg);
	    if (REFERENCE_CLASS_P (op)
		&& (op = maybe_fold_reference (op, !allows_reg && allows_mem))
		   != NULL_TREE)
	      {
		TREE_VALUE (link) = op;
		changed = true;
	      }
	  }
      }
      break;

    case GIMPLE_DEBUG:
      if (gimple_debug_bind_p (stmt))
	{
	  tree val = gimple_debug_bind_get_value (stmt);
	  if (val
	      && REFERENCE_CLASS_P (val))
	    {
	      tree tem = maybe_fold_reference (val, false);
	      if (tem)
		{
		  gimple_debug_bind_set_value (stmt, tem);
		  changed = true;
		}
	    }
	  else if (val
		   && TREE_CODE (val) == ADDR_EXPR)
	    {
	      tree ref = TREE_OPERAND (val, 0);
	      tree tem = maybe_fold_reference (ref, false);
	      if (tem)
		{
		  tem = build_fold_addr_expr_with_type (tem, TREE_TYPE (val));
		  gimple_debug_bind_set_value (stmt, tem);
		  changed = true;
		}
	    }
	}
      break;

    default:;
    }

  stmt = gsi_stmt (*gsi);

  /* Fold *& on the lhs.  */
  if (gimple_has_lhs (stmt))
    {
      tree lhs = gimple_get_lhs (stmt);
      if (lhs && REFERENCE_CLASS_P (lhs))
	{
	  tree new_lhs = maybe_fold_reference (lhs, true);
	  if (new_lhs)
	    {
	      gimple_set_lhs (stmt, new_lhs);
	      changed = true;
	    }
	}
    }

  fold_undefer_overflow_warnings (changed && !nowarning, stmt, 0);
  return changed;
}

/* Valueziation callback that ends up not following SSA edges.  */

tree
no_follow_ssa_edges (tree)
{
  return NULL_TREE;
}

/* Valueization callback that ends up following single-use SSA edges only.  */

tree
follow_single_use_edges (tree val)
{
  if (TREE_CODE (val) == SSA_NAME
      && !has_single_use (val))
    return NULL_TREE;
  return val;
}

/* Fold the statement pointed to by GSI.  In some cases, this function may
   replace the whole statement with a new one.  Returns true iff folding
   makes any changes.
   The statement pointed to by GSI should be in valid gimple form but may
   be in unfolded state as resulting from for example constant propagation
   which can produce *&x = 0.  */

bool
fold_stmt (gimple_stmt_iterator *gsi)
{
  return fold_stmt_1 (gsi, false, no_follow_ssa_edges);
}

bool
fold_stmt (gimple_stmt_iterator *gsi, tree (*valueize) (tree))
{
  return fold_stmt_1 (gsi, false, valueize);
}

/* Perform the minimal folding on statement *GSI.  Only operations like
   *&x created by constant propagation are handled.  The statement cannot
   be replaced with a new one.  Return true if the statement was
   changed, false otherwise.
   The statement *GSI should be in valid gimple form but may
   be in unfolded state as resulting from for example constant propagation
   which can produce *&x = 0.  */

bool
fold_stmt_inplace (gimple_stmt_iterator *gsi)
{
  gimple *stmt = gsi_stmt (*gsi);
  bool changed = fold_stmt_1 (gsi, true, no_follow_ssa_edges);
  gcc_assert (gsi_stmt (*gsi) == stmt);
  return changed;
}

/* Canonicalize and possibly invert the boolean EXPR; return NULL_TREE 
   if EXPR is null or we don't know how.
   If non-null, the result always has boolean type.  */

static tree
canonicalize_bool (tree expr, bool invert)
{
  if (!expr)
    return NULL_TREE;
  else if (invert)
    {
      if (integer_nonzerop (expr))
	return boolean_false_node;
      else if (integer_zerop (expr))
	return boolean_true_node;
      else if (TREE_CODE (expr) == SSA_NAME)
	return fold_build2 (EQ_EXPR, boolean_type_node, expr,
			    build_int_cst (TREE_TYPE (expr), 0));
      else if (COMPARISON_CLASS_P (expr))
	return fold_build2 (invert_tree_comparison (TREE_CODE (expr), false),
			    boolean_type_node,
			    TREE_OPERAND (expr, 0),
			    TREE_OPERAND (expr, 1));
      else
	return NULL_TREE;
    }
  else
    {
      if (TREE_CODE (TREE_TYPE (expr)) == BOOLEAN_TYPE)
	return expr;
      if (integer_nonzerop (expr))
	return boolean_true_node;
      else if (integer_zerop (expr))
	return boolean_false_node;
      else if (TREE_CODE (expr) == SSA_NAME)
	return fold_build2 (NE_EXPR, boolean_type_node, expr,
			    build_int_cst (TREE_TYPE (expr), 0));
      else if (COMPARISON_CLASS_P (expr))
	return fold_build2 (TREE_CODE (expr),
			    boolean_type_node,
			    TREE_OPERAND (expr, 0),
			    TREE_OPERAND (expr, 1));
      else
	return NULL_TREE;
    }
}

/* Check to see if a boolean expression EXPR is logically equivalent to the
   comparison (OP1 CODE OP2).  Check for various identities involving
   SSA_NAMEs.  */

static bool
same_bool_comparison_p (const_tree expr, enum tree_code code,
			const_tree op1, const_tree op2)
{
  gimple *s;

  /* The obvious case.  */
  if (TREE_CODE (expr) == code
      && operand_equal_p (TREE_OPERAND (expr, 0), op1, 0)
      && operand_equal_p (TREE_OPERAND (expr, 1), op2, 0))
    return true;

  /* Check for comparing (name, name != 0) and the case where expr
     is an SSA_NAME with a definition matching the comparison.  */
  if (TREE_CODE (expr) == SSA_NAME
      && TREE_CODE (TREE_TYPE (expr)) == BOOLEAN_TYPE)
    {
      if (operand_equal_p (expr, op1, 0))
	return ((code == NE_EXPR && integer_zerop (op2))
		|| (code == EQ_EXPR && integer_nonzerop (op2)));
      s = SSA_NAME_DEF_STMT (expr);
      if (is_gimple_assign (s)
	  && gimple_assign_rhs_code (s) == code
	  && operand_equal_p (gimple_assign_rhs1 (s), op1, 0)
	  && operand_equal_p (gimple_assign_rhs2 (s), op2, 0))
	return true;
    }

  /* If op1 is of the form (name != 0) or (name == 0), and the definition
     of name is a comparison, recurse.  */
  if (TREE_CODE (op1) == SSA_NAME
      && TREE_CODE (TREE_TYPE (op1)) == BOOLEAN_TYPE)
    {
      s = SSA_NAME_DEF_STMT (op1);
      if (is_gimple_assign (s)
	  && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison)
	{
	  enum tree_code c = gimple_assign_rhs_code (s);
	  if ((c == NE_EXPR && integer_zerop (op2))
	      || (c == EQ_EXPR && integer_nonzerop (op2)))
	    return same_bool_comparison_p (expr, c,
					   gimple_assign_rhs1 (s),
					   gimple_assign_rhs2 (s));
	  if ((c == EQ_EXPR && integer_zerop (op2))
	      || (c == NE_EXPR && integer_nonzerop (op2)))
	    return same_bool_comparison_p (expr,
					   invert_tree_comparison (c, false),
					   gimple_assign_rhs1 (s),
					   gimple_assign_rhs2 (s));
	}
    }
  return false;
}

/* Check to see if two boolean expressions OP1 and OP2 are logically
   equivalent.  */

static bool
same_bool_result_p (const_tree op1, const_tree op2)
{
  /* Simple cases first.  */
  if (operand_equal_p (op1, op2, 0))
    return true;

  /* Check the cases where at least one of the operands is a comparison.
     These are a bit smarter than operand_equal_p in that they apply some
     identifies on SSA_NAMEs.  */
  if (COMPARISON_CLASS_P (op2)
      && same_bool_comparison_p (op1, TREE_CODE (op2),
				 TREE_OPERAND (op2, 0),
				 TREE_OPERAND (op2, 1)))
    return true;
  if (COMPARISON_CLASS_P (op1)
      && same_bool_comparison_p (op2, TREE_CODE (op1),
				 TREE_OPERAND (op1, 0),
				 TREE_OPERAND (op1, 1)))
    return true;

  /* Default case.  */
  return false;
}

/* Forward declarations for some mutually recursive functions.  */

static tree
and_comparisons_1 (enum tree_code code1, tree op1a, tree op1b,
		   enum tree_code code2, tree op2a, tree op2b);
static tree
and_var_with_comparison (tree var, bool invert,
			 enum tree_code code2, tree op2a, tree op2b);
static tree
and_var_with_comparison_1 (gimple *stmt,
			   enum tree_code code2, tree op2a, tree op2b);
static tree
or_comparisons_1 (enum tree_code code1, tree op1a, tree op1b,
		  enum tree_code code2, tree op2a, tree op2b);
static tree
or_var_with_comparison (tree var, bool invert,
			enum tree_code code2, tree op2a, tree op2b);
static tree
or_var_with_comparison_1 (gimple *stmt,
			  enum tree_code code2, tree op2a, tree op2b);

/* Helper function for and_comparisons_1:  try to simplify the AND of the
   ssa variable VAR with the comparison specified by (OP2A CODE2 OP2B).
   If INVERT is true, invert the value of the VAR before doing the AND.
   Return NULL_EXPR if we can't simplify this to a single expression.  */

static tree
and_var_with_comparison (tree var, bool invert,
			 enum tree_code code2, tree op2a, tree op2b)
{
  tree t;
  gimple *stmt = SSA_NAME_DEF_STMT (var);

  /* We can only deal with variables whose definitions are assignments.  */
  if (!is_gimple_assign (stmt))
    return NULL_TREE;
  
  /* If we have an inverted comparison, apply DeMorgan's law and rewrite
     !var AND (op2a code2 op2b) => !(var OR !(op2a code2 op2b))
     Then we only have to consider the simpler non-inverted cases.  */
  if (invert)
    t = or_var_with_comparison_1 (stmt, 
				  invert_tree_comparison (code2, false),
				  op2a, op2b);
  else
    t = and_var_with_comparison_1 (stmt, code2, op2a, op2b);
  return canonicalize_bool (t, invert);
}

/* Try to simplify the AND of the ssa variable defined by the assignment
   STMT with the comparison specified by (OP2A CODE2 OP2B).
   Return NULL_EXPR if we can't simplify this to a single expression.  */

static tree
and_var_with_comparison_1 (gimple *stmt,
			   enum tree_code code2, tree op2a, tree op2b)
{
  tree var = gimple_assign_lhs (stmt);
  tree true_test_var = NULL_TREE;
  tree false_test_var = NULL_TREE;
  enum tree_code innercode = gimple_assign_rhs_code (stmt);

  /* Check for identities like (var AND (var == 0)) => false.  */
  if (TREE_CODE (op2a) == SSA_NAME
      && TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE)
    {
      if ((code2 == NE_EXPR && integer_zerop (op2b))
	  || (code2 == EQ_EXPR && integer_nonzerop (op2b)))
	{
	  true_test_var = op2a;
	  if (var == true_test_var)
	    return var;
	}
      else if ((code2 == EQ_EXPR && integer_zerop (op2b))
	       || (code2 == NE_EXPR && integer_nonzerop (op2b)))
	{
	  false_test_var = op2a;
	  if (var == false_test_var)
	    return boolean_false_node;
	}
    }

  /* If the definition is a comparison, recurse on it.  */
  if (TREE_CODE_CLASS (innercode) == tcc_comparison)
    {
      tree t = and_comparisons_1 (innercode,
				  gimple_assign_rhs1 (stmt),
				  gimple_assign_rhs2 (stmt),
				  code2,
				  op2a,
				  op2b);
      if (t)
	return t;
    }

  /* If the definition is an AND or OR expression, we may be able to
     simplify by reassociating.  */
  if (TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE
      && (innercode == BIT_AND_EXPR || innercode == BIT_IOR_EXPR))
    {
      tree inner1 = gimple_assign_rhs1 (stmt);
      tree inner2 = gimple_assign_rhs2 (stmt);
      gimple *s;
      tree t;
      tree partial = NULL_TREE;
      bool is_and = (innercode == BIT_AND_EXPR);
      
      /* Check for boolean identities that don't require recursive examination
	 of inner1/inner2:
	 inner1 AND (inner1 AND inner2) => inner1 AND inner2 => var
	 inner1 AND (inner1 OR inner2) => inner1
	 !inner1 AND (inner1 AND inner2) => false
	 !inner1 AND (inner1 OR inner2) => !inner1 AND inner2
         Likewise for similar cases involving inner2.  */
      if (inner1 == true_test_var)
	return (is_and ? var : inner1);
      else if (inner2 == true_test_var)
	return (is_and ? var : inner2);
      else if (inner1 == false_test_var)
	return (is_and
		? boolean_false_node
		: and_var_with_comparison (inner2, false, code2, op2a, op2b));
      else if (inner2 == false_test_var)
	return (is_and
		? boolean_false_node
		: and_var_with_comparison (inner1, false, code2, op2a, op2b));

      /* Next, redistribute/reassociate the AND across the inner tests.
	 Compute the first partial result, (inner1 AND (op2a code op2b))  */
      if (TREE_CODE (inner1) == SSA_NAME
	  && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner1))
	  && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison
	  && (t = maybe_fold_and_comparisons (gimple_assign_rhs_code (s),
					      gimple_assign_rhs1 (s),
					      gimple_assign_rhs2 (s),
					      code2, op2a, op2b)))
	{
	  /* Handle the AND case, where we are reassociating:
	     (inner1 AND inner2) AND (op2a code2 op2b)
	     => (t AND inner2)
	     If the partial result t is a constant, we win.  Otherwise
	     continue on to try reassociating with the other inner test.  */
	  if (is_and)
	    {
	      if (integer_onep (t))
		return inner2;
	      else if (integer_zerop (t))
		return boolean_false_node;
	    }

	  /* Handle the OR case, where we are redistributing:
	     (inner1 OR inner2) AND (op2a code2 op2b)
	     => (t OR (inner2 AND (op2a code2 op2b)))  */
	  else if (integer_onep (t))
	    return boolean_true_node;

	  /* Save partial result for later.  */
	  partial = t;
	}
      
      /* Compute the second partial result, (inner2 AND (op2a code op2b)) */
      if (TREE_CODE (inner2) == SSA_NAME
	  && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner2))
	  && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison
	  && (t = maybe_fold_and_comparisons (gimple_assign_rhs_code (s),
					      gimple_assign_rhs1 (s),
					      gimple_assign_rhs2 (s),
					      code2, op2a, op2b)))
	{
	  /* Handle the AND case, where we are reassociating:
	     (inner1 AND inner2) AND (op2a code2 op2b)
	     => (inner1 AND t)  */
	  if (is_and)
	    {
	      if (integer_onep (t))
		return inner1;
	      else if (integer_zerop (t))
		return boolean_false_node;
	      /* If both are the same, we can apply the identity
		 (x AND x) == x.  */
	      else if (partial && same_bool_result_p (t, partial))
		return t;
	    }

	  /* Handle the OR case. where we are redistributing:
	     (inner1 OR inner2) AND (op2a code2 op2b)
	     => (t OR (inner1 AND (op2a code2 op2b)))
	     => (t OR partial)  */
	  else
	    {
	      if (integer_onep (t))
		return boolean_true_node;
	      else if (partial)
		{
		  /* We already got a simplification for the other
		     operand to the redistributed OR expression.  The
		     interesting case is when at least one is false.
		     Or, if both are the same, we can apply the identity
		     (x OR x) == x.  */
		  if (integer_zerop (partial))
		    return t;
		  else if (integer_zerop (t))
		    return partial;
		  else if (same_bool_result_p (t, partial))
		    return t;
		}
	    }
	}
    }
  return NULL_TREE;
}

/* Try to simplify the AND of two comparisons defined by
   (OP1A CODE1 OP1B) and (OP2A CODE2 OP2B), respectively.
   If this can be done without constructing an intermediate value,
   return the resulting tree; otherwise NULL_TREE is returned.
   This function is deliberately asymmetric as it recurses on SSA_DEFs
   in the first comparison but not the second.  */

static tree
and_comparisons_1 (enum tree_code code1, tree op1a, tree op1b,
		   enum tree_code code2, tree op2a, tree op2b)
{
  tree truth_type = truth_type_for (TREE_TYPE (op1a));

  /* First check for ((x CODE1 y) AND (x CODE2 y)).  */
  if (operand_equal_p (op1a, op2a, 0)
      && operand_equal_p (op1b, op2b, 0))
    {
      /* Result will be either NULL_TREE, or a combined comparison.  */
      tree t = combine_comparisons (UNKNOWN_LOCATION,
				    TRUTH_ANDIF_EXPR, code1, code2,
				    truth_type, op1a, op1b);
      if (t)
	return t;
    }

  /* Likewise the swapped case of the above.  */
  if (operand_equal_p (op1a, op2b, 0)
      && operand_equal_p (op1b, op2a, 0))
    {
      /* Result will be either NULL_TREE, or a combined comparison.  */
      tree t = combine_comparisons (UNKNOWN_LOCATION,
				    TRUTH_ANDIF_EXPR, code1,
				    swap_tree_comparison (code2),
				    truth_type, op1a, op1b);
      if (t)
	return t;
    }

  /* If both comparisons are of the same value against constants, we might
     be able to merge them.  */
  if (operand_equal_p (op1a, op2a, 0)
      && TREE_CODE (op1b) == INTEGER_CST
      && TREE_CODE (op2b) == INTEGER_CST)
    {
      int cmp = tree_int_cst_compare (op1b, op2b);

      /* If we have (op1a == op1b), we should either be able to
	 return that or FALSE, depending on whether the constant op1b
	 also satisfies the other comparison against op2b.  */
      if (code1 == EQ_EXPR)
	{
	  bool done = true;
	  bool val;
	  switch (code2)
	    {
	    case EQ_EXPR: val = (cmp == 0); break;
	    case NE_EXPR: val = (cmp != 0); break;
	    case LT_EXPR: val = (cmp < 0); break;
	    case GT_EXPR: val = (cmp > 0); break;
	    case LE_EXPR: val = (cmp <= 0); break;
	    case GE_EXPR: val = (cmp >= 0); break;
	    default: done = false;
	    }
	  if (done)
	    {
	      if (val)
		return fold_build2 (code1, boolean_type_node, op1a, op1b);
	      else
		return boolean_false_node;
	    }
	}
      /* Likewise if the second comparison is an == comparison.  */
      else if (code2 == EQ_EXPR)
	{
	  bool done = true;
	  bool val;
	  switch (code1)
	    {
	    case EQ_EXPR: val = (cmp == 0); break;
	    case NE_EXPR: val = (cmp != 0); break;
	    case LT_EXPR: val = (cmp > 0); break;
	    case GT_EXPR: val = (cmp < 0); break;
	    case LE_EXPR: val = (cmp >= 0); break;
	    case GE_EXPR: val = (cmp <= 0); break;
	    default: done = false;
	    }
	  if (done)
	    {
	      if (val)
		return fold_build2 (code2, boolean_type_node, op2a, op2b);
	      else
		return boolean_false_node;
	    }
	}

      /* Same business with inequality tests.  */
      else if (code1 == NE_EXPR)
	{
	  bool val;
	  switch (code2)
	    {
	    case EQ_EXPR: val = (cmp != 0); break;
	    case NE_EXPR: val = (cmp == 0); break;
	    case LT_EXPR: val = (cmp >= 0); break;
	    case GT_EXPR: val = (cmp <= 0); break;
	    case LE_EXPR: val = (cmp > 0); break;
	    case GE_EXPR: val = (cmp < 0); break;
	    default:
	      val = false;
	    }
	  if (val)
	    return fold_build2 (code2, boolean_type_node, op2a, op2b);
	}
      else if (code2 == NE_EXPR)
	{
	  bool val;
	  switch (code1)
	    {
	    case EQ_EXPR: val = (cmp == 0); break;
	    case NE_EXPR: val = (cmp != 0); break;
	    case LT_EXPR: val = (cmp <= 0); break;
	    case GT_EXPR: val = (cmp >= 0); break;
	    case LE_EXPR: val = (cmp < 0); break;
	    case GE_EXPR: val = (cmp > 0); break;
	    default:
	      val = false;
	    }
	  if (val)
	    return fold_build2 (code1, boolean_type_node, op1a, op1b);
	}

      /* Chose the more restrictive of two < or <= comparisons.  */
      else if ((code1 == LT_EXPR || code1 == LE_EXPR)
	       && (code2 == LT_EXPR || code2 == LE_EXPR))
	{
	  if ((cmp < 0) || (cmp == 0 && code1 == LT_EXPR))
	    return fold_build2 (code1, boolean_type_node, op1a, op1b);
	  else
	    return fold_build2 (code2, boolean_type_node, op2a, op2b);
	}

      /* Likewise chose the more restrictive of two > or >= comparisons.  */
      else if ((code1 == GT_EXPR || code1 == GE_EXPR)
	       && (code2 == GT_EXPR || code2 == GE_EXPR))
	{
	  if ((cmp > 0) || (cmp == 0 && code1 == GT_EXPR))
	    return fold_build2 (code1, boolean_type_node, op1a, op1b);
	  else
	    return fold_build2 (code2, boolean_type_node, op2a, op2b);
	}

      /* Check for singleton ranges.  */
      else if (cmp == 0
	       && ((code1 == LE_EXPR && code2 == GE_EXPR)
		   || (code1 == GE_EXPR && code2 == LE_EXPR)))
	return fold_build2 (EQ_EXPR, boolean_type_node, op1a, op2b);

      /* Check for disjoint ranges. */
      else if (cmp <= 0
	       && (code1 == LT_EXPR || code1 == LE_EXPR)
	       && (code2 == GT_EXPR || code2 == GE_EXPR))
	return boolean_false_node;
      else if (cmp >= 0
	       && (code1 == GT_EXPR || code1 == GE_EXPR)
	       && (code2 == LT_EXPR || code2 == LE_EXPR))
	return boolean_false_node;
    }

  /* Perhaps the first comparison is (NAME != 0) or (NAME == 1) where
     NAME's definition is a truth value.  See if there are any simplifications
     that can be done against the NAME's definition.  */
  if (TREE_CODE (op1a) == SSA_NAME
      && (code1 == NE_EXPR || code1 == EQ_EXPR)
      && (integer_zerop (op1b) || integer_onep (op1b)))
    {
      bool invert = ((code1 == EQ_EXPR && integer_zerop (op1b))
		     || (code1 == NE_EXPR && integer_onep (op1b)));
      gimple *stmt = SSA_NAME_DEF_STMT (op1a);
      switch (gimple_code (stmt))
	{
	case GIMPLE_ASSIGN:
	  /* Try to simplify by copy-propagating the definition.  */
	  return and_var_with_comparison (op1a, invert, code2, op2a, op2b);

	case GIMPLE_PHI:
	  /* If every argument to the PHI produces the same result when
	     ANDed with the second comparison, we win.
	     Do not do this unless the type is bool since we need a bool
	     result here anyway.  */
	  if (TREE_CODE (TREE_TYPE (op1a)) == BOOLEAN_TYPE)
	    {
	      tree result = NULL_TREE;
	      unsigned i;
	      for (i = 0; i < gimple_phi_num_args (stmt); i++)
		{
		  tree arg = gimple_phi_arg_def (stmt, i);
		  
		  /* If this PHI has itself as an argument, ignore it.
		     If all the other args produce the same result,
		     we're still OK.  */
		  if (arg == gimple_phi_result (stmt))
		    continue;
		  else if (TREE_CODE (arg) == INTEGER_CST)
		    {
		      if (invert ? integer_nonzerop (arg) : integer_zerop (arg))
			{
			  if (!result)
			    result = boolean_false_node;
			  else if (!integer_zerop (result))
			    return NULL_TREE;
			}
		      else if (!result)
			result = fold_build2 (code2, boolean_type_node,
					      op2a, op2b);
		      else if (!same_bool_comparison_p (result,
							code2, op2a, op2b))
			return NULL_TREE;
		    }
		  else if (TREE_CODE (arg) == SSA_NAME
			   && !SSA_NAME_IS_DEFAULT_DEF (arg))
		    {
		      tree temp;
		      gimple *def_stmt = SSA_NAME_DEF_STMT (arg);
		      /* In simple cases we can look through PHI nodes,
			 but we have to be careful with loops.
			 See PR49073.  */
		      if (! dom_info_available_p (CDI_DOMINATORS)
			  || gimple_bb (def_stmt) == gimple_bb (stmt)
			  || dominated_by_p (CDI_DOMINATORS,
					     gimple_bb (def_stmt),
					     gimple_bb (stmt)))
			return NULL_TREE;
		      temp = and_var_with_comparison (arg, invert, code2,
						      op2a, op2b);
		      if (!temp)
			return NULL_TREE;
		      else if (!result)
			result = temp;
		      else if (!same_bool_result_p (result, temp))
			return NULL_TREE;
		    }
		  else
		    return NULL_TREE;
		}
	      return result;
	    }

	default:
	  break;
	}
    }
  return NULL_TREE;
}

/* Try to simplify the AND of two comparisons, specified by
   (OP1A CODE1 OP1B) and (OP2B CODE2 OP2B), respectively.
   If this can be simplified to a single expression (without requiring
   introducing more SSA variables to hold intermediate values),
   return the resulting tree.  Otherwise return NULL_TREE.
   If the result expression is non-null, it has boolean type.  */

tree
maybe_fold_and_comparisons (enum tree_code code1, tree op1a, tree op1b,
			    enum tree_code code2, tree op2a, tree op2b)
{
  tree t = and_comparisons_1 (code1, op1a, op1b, code2, op2a, op2b);
  if (t)
    return t;
  else
    return and_comparisons_1 (code2, op2a, op2b, code1, op1a, op1b);
}

/* Helper function for or_comparisons_1:  try to simplify the OR of the
   ssa variable VAR with the comparison specified by (OP2A CODE2 OP2B).
   If INVERT is true, invert the value of VAR before doing the OR.
   Return NULL_EXPR if we can't simplify this to a single expression.  */

static tree
or_var_with_comparison (tree var, bool invert,
			enum tree_code code2, tree op2a, tree op2b)
{
  tree t;
  gimple *stmt = SSA_NAME_DEF_STMT (var);

  /* We can only deal with variables whose definitions are assignments.  */
  if (!is_gimple_assign (stmt))
    return NULL_TREE;
  
  /* If we have an inverted comparison, apply DeMorgan's law and rewrite
     !var OR (op2a code2 op2b) => !(var AND !(op2a code2 op2b))
     Then we only have to consider the simpler non-inverted cases.  */
  if (invert)
    t = and_var_with_comparison_1 (stmt, 
				   invert_tree_comparison (code2, false),
				   op2a, op2b);
  else
    t = or_var_with_comparison_1 (stmt, code2, op2a, op2b);
  return canonicalize_bool (t, invert);
}

/* Try to simplify the OR of the ssa variable defined by the assignment
   STMT with the comparison specified by (OP2A CODE2 OP2B).
   Return NULL_EXPR if we can't simplify this to a single expression.  */

static tree
or_var_with_comparison_1 (gimple *stmt,
			  enum tree_code code2, tree op2a, tree op2b)
{
  tree var = gimple_assign_lhs (stmt);
  tree true_test_var = NULL_TREE;
  tree false_test_var = NULL_TREE;
  enum tree_code innercode = gimple_assign_rhs_code (stmt);

  /* Check for identities like (var OR (var != 0)) => true .  */
  if (TREE_CODE (op2a) == SSA_NAME
      && TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE)
    {
      if ((code2 == NE_EXPR && integer_zerop (op2b))
	  || (code2 == EQ_EXPR && integer_nonzerop (op2b)))
	{
	  true_test_var = op2a;
	  if (var == true_test_var)
	    return var;
	}
      else if ((code2 == EQ_EXPR && integer_zerop (op2b))
	       || (code2 == NE_EXPR && integer_nonzerop (op2b)))
	{
	  false_test_var = op2a;
	  if (var == false_test_var)
	    return boolean_true_node;
	}
    }

  /* If the definition is a comparison, recurse on it.  */
  if (TREE_CODE_CLASS (innercode) == tcc_comparison)
    {
      tree t = or_comparisons_1 (innercode,
				 gimple_assign_rhs1 (stmt),
				 gimple_assign_rhs2 (stmt),
				 code2,
				 op2a,
				 op2b);
      if (t)
	return t;
    }
  
  /* If the definition is an AND or OR expression, we may be able to
     simplify by reassociating.  */
  if (TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE
      && (innercode == BIT_AND_EXPR || innercode == BIT_IOR_EXPR))
    {
      tree inner1 = gimple_assign_rhs1 (stmt);
      tree inner2 = gimple_assign_rhs2 (stmt);
      gimple *s;
      tree t;
      tree partial = NULL_TREE;
      bool is_or = (innercode == BIT_IOR_EXPR);
      
      /* Check for boolean identities that don't require recursive examination
	 of inner1/inner2:
	 inner1 OR (inner1 OR inner2) => inner1 OR inner2 => var
	 inner1 OR (inner1 AND inner2) => inner1
	 !inner1 OR (inner1 OR inner2) => true
	 !inner1 OR (inner1 AND inner2) => !inner1 OR inner2
      */
      if (inner1 == true_test_var)
	return (is_or ? var : inner1);
      else if (inner2 == true_test_var)
	return (is_or ? var : inner2);
      else if (inner1 == false_test_var)
	return (is_or
		? boolean_true_node
		: or_var_with_comparison (inner2, false, code2, op2a, op2b));
      else if (inner2 == false_test_var)
	return (is_or
		? boolean_true_node
		: or_var_with_comparison (inner1, false, code2, op2a, op2b));
      
      /* Next, redistribute/reassociate the OR across the inner tests.
	 Compute the first partial result, (inner1 OR (op2a code op2b))  */
      if (TREE_CODE (inner1) == SSA_NAME
	  && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner1))
	  && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison
	  && (t = maybe_fold_or_comparisons (gimple_assign_rhs_code (s),
					     gimple_assign_rhs1 (s),
					     gimple_assign_rhs2 (s),
					     code2, op2a, op2b)))
	{
	  /* Handle the OR case, where we are reassociating:
	     (inner1 OR inner2) OR (op2a code2 op2b)
	     => (t OR inner2)
	     If the partial result t is a constant, we win.  Otherwise
	     continue on to try reassociating with the other inner test.  */
	  if (is_or)
	    {
	      if (integer_onep (t))
		return boolean_true_node;
	      else if (integer_zerop (t))
		return inner2;
	    }
	  
	  /* Handle the AND case, where we are redistributing:
	     (inner1 AND inner2) OR (op2a code2 op2b)
	     => (t AND (inner2 OR (op2a code op2b)))  */
	  else if (integer_zerop (t))
	    return boolean_false_node;

	  /* Save partial result for later.  */
	  partial = t;
	}
      
      /* Compute the second partial result, (inner2 OR (op2a code op2b)) */
      if (TREE_CODE (inner2) == SSA_NAME
	  && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner2))
	  && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison
	  && (t = maybe_fold_or_comparisons (gimple_assign_rhs_code (s),
					     gimple_assign_rhs1 (s),
					     gimple_assign_rhs2 (s),
					     code2, op2a, op2b)))
	{
	  /* Handle the OR case, where we are reassociating:
	     (inner1 OR inner2) OR (op2a code2 op2b)
	     => (inner1 OR t)
	     => (t OR partial)  */
	  if (is_or)
	    {
	      if (integer_zerop (t))
		return inner1;
	      else if (integer_onep (t))
		return boolean_true_node;
	      /* If both are the same, we can apply the identity
		 (x OR x) == x.  */
	      else if (partial && same_bool_result_p (t, partial))
		return t;
	    }
	  
	  /* Handle the AND case, where we are redistributing:
	     (inner1 AND inner2) OR (op2a code2 op2b)
	     => (t AND (inner1 OR (op2a code2 op2b)))
	     => (t AND partial)  */
	  else 
	    {
	      if (integer_zerop (t))
		return boolean_false_node;
	      else if (partial)
		{
		  /* We already got a simplification for the other
		     operand to the redistributed AND expression.  The
		     interesting case is when at least one is true.
		     Or, if both are the same, we can apply the identity
		     (x AND x) == x.  */
		  if (integer_onep (partial))
		    return t;
		  else if (integer_onep (t))
		    return partial;
		  else if (same_bool_result_p (t, partial))
		    return t;
		}
	    }
	}
    }
  return NULL_TREE;
}

/* Try to simplify the OR of two comparisons defined by
   (OP1A CODE1 OP1B) and (OP2A CODE2 OP2B), respectively.
   If this can be done without constructing an intermediate value,
   return the resulting tree; otherwise NULL_TREE is returned.
   This function is deliberately asymmetric as it recurses on SSA_DEFs
   in the first comparison but not the second.  */

static tree
or_comparisons_1 (enum tree_code code1, tree op1a, tree op1b,
		  enum tree_code code2, tree op2a, tree op2b)
{
  tree truth_type = truth_type_for (TREE_TYPE (op1a));

  /* First check for ((x CODE1 y) OR (x CODE2 y)).  */
  if (operand_equal_p (op1a, op2a, 0)
      && operand_equal_p (op1b, op2b, 0))
    {
      /* Result will be either NULL_TREE, or a combined comparison.  */
      tree t = combine_comparisons (UNKNOWN_LOCATION,
				    TRUTH_ORIF_EXPR, code1, code2,
				    truth_type, op1a, op1b);
      if (t)
	return t;
    }

  /* Likewise the swapped case of the above.  */
  if (operand_equal_p (op1a, op2b, 0)
      && operand_equal_p (op1b, op2a, 0))
    {
      /* Result will be either NULL_TREE, or a combined comparison.  */
      tree t = combine_comparisons (UNKNOWN_LOCATION,
				    TRUTH_ORIF_EXPR, code1,
				    swap_tree_comparison (code2),
				    truth_type, op1a, op1b);
      if (t)
	return t;
    }

  /* If both comparisons are of the same value against constants, we might
     be able to merge them.  */
  if (operand_equal_p (op1a, op2a, 0)
      && TREE_CODE (op1b) == INTEGER_CST
      && TREE_CODE (op2b) == INTEGER_CST)
    {
      int cmp = tree_int_cst_compare (op1b, op2b);

      /* If we have (op1a != op1b), we should either be able to
	 return that or TRUE, depending on whether the constant op1b
	 also satisfies the other comparison against op2b.  */
      if (code1 == NE_EXPR)
	{
	  bool done = true;
	  bool val;
	  switch (code2)
	    {
	    case EQ_EXPR: val = (cmp == 0); break;
	    case NE_EXPR: val = (cmp != 0); break;
	    case LT_EXPR: val = (cmp < 0); break;
	    case GT_EXPR: val = (cmp > 0); break;
	    case LE_EXPR: val = (cmp <= 0); break;
	    case GE_EXPR: val = (cmp >= 0); break;
	    default: done = false;
	    }
	  if (done)
	    {
	      if (val)
		return boolean_true_node;
	      else
		return fold_build2 (code1, boolean_type_node, op1a, op1b);
	    }
	}
      /* Likewise if the second comparison is a != comparison.  */
      else if (code2 == NE_EXPR)
	{
	  bool done = true;
	  bool val;
	  switch (code1)
	    {
	    case EQ_EXPR: val = (cmp == 0); break;
	    case NE_EXPR: val = (cmp != 0); break;
	    case LT_EXPR: val = (cmp > 0); break;
	    case GT_EXPR: val = (cmp < 0); break;
	    case LE_EXPR: val = (cmp >= 0); break;
	    case GE_EXPR: val = (cmp <= 0); break;
	    default: done = false;
	    }
	  if (done)
	    {
	      if (val)
		return boolean_true_node;
	      else
		return fold_build2 (code2, boolean_type_node, op2a, op2b);
	    }
	}

      /* See if an equality test is redundant with the other comparison.  */
      else if (code1 == EQ_EXPR)
	{
	  bool val;
	  switch (code2)
	    {
	    case EQ_EXPR: val = (cmp == 0); break;
	    case NE_EXPR: val = (cmp != 0); break;
	    case LT_EXPR: val = (cmp < 0); break;
	    case GT_EXPR: val = (cmp > 0); break;
	    case LE_EXPR: val = (cmp <= 0); break;
	    case GE_EXPR: val = (cmp >= 0); break;
	    default:
	      val = false;
	    }
	  if (val)
	    return fold_build2 (code2, boolean_type_node, op2a, op2b);
	}
      else if (code2 == EQ_EXPR)
	{
	  bool val;
	  switch (code1)
	    {
	    case EQ_EXPR: val = (cmp == 0); break;
	    case NE_EXPR: val = (cmp != 0); break;
	    case LT_EXPR: val = (cmp > 0); break;
	    case GT_EXPR: val = (cmp < 0); break;
	    case LE_EXPR: val = (cmp >= 0); break;
	    case GE_EXPR: val = (cmp <= 0); break;
	    default:
	      val = false;
	    }
	  if (val)
	    return fold_build2 (code1, boolean_type_node, op1a, op1b);
	}

      /* Chose the less restrictive of two < or <= comparisons.  */
      else if ((code1 == LT_EXPR || code1 == LE_EXPR)
	       && (code2 == LT_EXPR || code2 == LE_EXPR))
	{
	  if ((cmp < 0) || (cmp == 0 && code1 == LT_EXPR))
	    return fold_build2 (code2, boolean_type_node, op2a, op2b);
	  else
	    return fold_build2 (code1, boolean_type_node, op1a, op1b);
	}

      /* Likewise chose the less restrictive of two > or >= comparisons.  */
      else if ((code1 == GT_EXPR || code1 == GE_EXPR)
	       && (code2 == GT_EXPR || code2 == GE_EXPR))
	{
	  if ((cmp > 0) || (cmp == 0 && code1 == GT_EXPR))
	    return fold_build2 (code2, boolean_type_node, op2a, op2b);
	  else
	    return fold_build2 (code1, boolean_type_node, op1a, op1b);
	}

      /* Check for singleton ranges.  */
      else if (cmp == 0
	       && ((code1 == LT_EXPR && code2 == GT_EXPR)
		   || (code1 == GT_EXPR && code2 == LT_EXPR)))
	return fold_build2 (NE_EXPR, boolean_type_node, op1a, op2b);

      /* Check for less/greater pairs that don't restrict the range at all.  */
      else if (cmp >= 0
	       && (code1 == LT_EXPR || code1 == LE_EXPR)
	       && (code2 == GT_EXPR || code2 == GE_EXPR))
	return boolean_true_node;
      else if (cmp <= 0
	       && (code1 == GT_EXPR || code1 == GE_EXPR)
	       && (code2 == LT_EXPR || code2 == LE_EXPR))
	return boolean_true_node;
    }

  /* Perhaps the first comparison is (NAME != 0) or (NAME == 1) where
     NAME's definition is a truth value.  See if there are any simplifications
     that can be done against the NAME's definition.  */
  if (TREE_CODE (op1a) == SSA_NAME
      && (code1 == NE_EXPR || code1 == EQ_EXPR)
      && (integer_zerop (op1b) || integer_onep (op1b)))
    {
      bool invert = ((code1 == EQ_EXPR && integer_zerop (op1b))
		     || (code1 == NE_EXPR && integer_onep (op1b)));
      gimple *stmt = SSA_NAME_DEF_STMT (op1a);
      switch (gimple_code (stmt))
	{
	case GIMPLE_ASSIGN:
	  /* Try to simplify by copy-propagating the definition.  */
	  return or_var_with_comparison (op1a, invert, code2, op2a, op2b);

	case GIMPLE_PHI:
	  /* If every argument to the PHI produces the same result when
	     ORed with the second comparison, we win.
	     Do not do this unless the type is bool since we need a bool
	     result here anyway.  */
	  if (TREE_CODE (TREE_TYPE (op1a)) == BOOLEAN_TYPE)
	    {
	      tree result = NULL_TREE;
	      unsigned i;
	      for (i = 0; i < gimple_phi_num_args (stmt); i++)
		{
		  tree arg = gimple_phi_arg_def (stmt, i);
		  
		  /* If this PHI has itself as an argument, ignore it.
		     If all the other args produce the same result,
		     we're still OK.  */
		  if (arg == gimple_phi_result (stmt))
		    continue;
		  else if (TREE_CODE (arg) == INTEGER_CST)
		    {
		      if (invert ? integer_zerop (arg) : integer_nonzerop (arg))
			{
			  if (!result)
			    result = boolean_true_node;
			  else if (!integer_onep (result))
			    return NULL_TREE;
			}
		      else if (!result)
			result = fold_build2 (code2, boolean_type_node,
					      op2a, op2b);
		      else if (!same_bool_comparison_p (result,
							code2, op2a, op2b))
			return NULL_TREE;
		    }
		  else if (TREE_CODE (arg) == SSA_NAME
			   && !SSA_NAME_IS_DEFAULT_DEF (arg))
		    {
		      tree temp;
		      gimple *def_stmt = SSA_NAME_DEF_STMT (arg);
		      /* In simple cases we can look through PHI nodes,
			 but we have to be careful with loops.
			 See PR49073.  */
		      if (! dom_info_available_p (CDI_DOMINATORS)
			  || gimple_bb (def_stmt) == gimple_bb (stmt)
			  || dominated_by_p (CDI_DOMINATORS,
					     gimple_bb (def_stmt),
					     gimple_bb (stmt)))
			return NULL_TREE;
		      temp = or_var_with_comparison (arg, invert, code2,
						     op2a, op2b);
		      if (!temp)
			return NULL_TREE;
		      else if (!result)
			result = temp;
		      else if (!same_bool_result_p (result, temp))
			return NULL_TREE;
		    }
		  else
		    return NULL_TREE;
		}
	      return result;
	    }

	default:
	  break;
	}
    }
  return NULL_TREE;
}

/* Try to simplify the OR of two comparisons, specified by
   (OP1A CODE1 OP1B) and (OP2B CODE2 OP2B), respectively.
   If this can be simplified to a single expression (without requiring
   introducing more SSA variables to hold intermediate values),
   return the resulting tree.  Otherwise return NULL_TREE.
   If the result expression is non-null, it has boolean type.  */

tree
maybe_fold_or_comparisons (enum tree_code code1, tree op1a, tree op1b,
			   enum tree_code code2, tree op2a, tree op2b)
{
  tree t = or_comparisons_1 (code1, op1a, op1b, code2, op2a, op2b);
  if (t)
    return t;
  else
    return or_comparisons_1 (code2, op2a, op2b, code1, op1a, op1b);
}


/* Fold STMT to a constant using VALUEIZE to valueize SSA names.

   Either NULL_TREE, a simplified but non-constant or a constant
   is returned.

   ???  This should go into a gimple-fold-inline.h file to be eventually
   privatized with the single valueize function used in the various TUs
   to avoid the indirect function call overhead.  */

tree
gimple_fold_stmt_to_constant_1 (gimple *stmt, tree (*valueize) (tree),
				tree (*gvalueize) (tree))
{
  code_helper rcode;
  tree ops[3] = {};
  /* ???  The SSA propagators do not correctly deal with following SSA use-def
     edges if there are intermediate VARYING defs.  For this reason
     do not follow SSA edges here even though SCCVN can technically
     just deal fine with that.  */
  if (gimple_simplify (stmt, &rcode, ops, NULL, gvalueize, valueize))
    {
      tree res = NULL_TREE;
      if (gimple_simplified_result_is_gimple_val (rcode, ops))
	res = ops[0];
      else if (mprts_hook)
	res = mprts_hook (rcode, gimple_expr_type (stmt), ops);
      if (res)
	{
	  if (dump_file && dump_flags & TDF_DETAILS)
	    {
	      fprintf (dump_file, "Match-and-simplified ");
	      print_gimple_expr (dump_file, stmt, 0, TDF_SLIM);
	      fprintf (dump_file, " to ");
	      print_generic_expr (dump_file, res, 0);
	      fprintf (dump_file, "\n");
	    }
	  return res;
	}
    }

  location_t loc = gimple_location (stmt);
  switch (gimple_code (stmt))
    {
    case GIMPLE_ASSIGN:
      {
        enum tree_code subcode = gimple_assign_rhs_code (stmt);

        switch (get_gimple_rhs_class (subcode))
          {
          case GIMPLE_SINGLE_RHS:
            {
              tree rhs = gimple_assign_rhs1 (stmt);
              enum tree_code_class kind = TREE_CODE_CLASS (subcode);

              if (TREE_CODE (rhs) == SSA_NAME)
                {
                  /* If the RHS is an SSA_NAME, return its known constant value,
                     if any.  */
                  return (*valueize) (rhs);
                }
	      /* Handle propagating invariant addresses into address
		 operations.  */
	      else if (TREE_CODE (rhs) == ADDR_EXPR
		       && !is_gimple_min_invariant (rhs))
		{
		  HOST_WIDE_INT offset = 0;
		  tree base;
		  base = get_addr_base_and_unit_offset_1 (TREE_OPERAND (rhs, 0),
							  &offset,
							  valueize);
		  if (base
		      && (CONSTANT_CLASS_P (base)
			  || decl_address_invariant_p (base)))
		    return build_invariant_address (TREE_TYPE (rhs),
						    base, offset);
		}
	      else if (TREE_CODE (rhs) == CONSTRUCTOR
		       && TREE_CODE (TREE_TYPE (rhs)) == VECTOR_TYPE
		       && (CONSTRUCTOR_NELTS (rhs)
			   == TYPE_VECTOR_SUBPARTS (TREE_TYPE (rhs))))
		{
		  unsigned i;
		  tree val, *vec;

		  vec = XALLOCAVEC (tree,
				    TYPE_VECTOR_SUBPARTS (TREE_TYPE (rhs)));
		  FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (rhs), i, val)
		    {
		      val = (*valueize) (val);
		      if (TREE_CODE (val) == INTEGER_CST
			  || TREE_CODE (val) == REAL_CST
			  || TREE_CODE (val) == FIXED_CST)
			vec[i] = val;
		      else
			return NULL_TREE;
		    }

		  return build_vector (TREE_TYPE (rhs), vec);
		}
	      if (subcode == OBJ_TYPE_REF)
		{
		  tree val = (*valueize) (OBJ_TYPE_REF_EXPR (rhs));
		  /* If callee is constant, we can fold away the wrapper.  */
		  if (is_gimple_min_invariant (val))
		    return val;
		}

              if (kind == tcc_reference)
		{
		  if ((TREE_CODE (rhs) == VIEW_CONVERT_EXPR
		       || TREE_CODE (rhs) == REALPART_EXPR
		       || TREE_CODE (rhs) == IMAGPART_EXPR)
		      && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME)
		    {
		      tree val = (*valueize) (TREE_OPERAND (rhs, 0));
		      return fold_unary_loc (EXPR_LOCATION (rhs),
					     TREE_CODE (rhs),
					     TREE_TYPE (rhs), val);
		    }
		  else if (TREE_CODE (rhs) == BIT_FIELD_REF
			   && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME)
		    {
		      tree val = (*valueize) (TREE_OPERAND (rhs, 0));
		      return fold_ternary_loc (EXPR_LOCATION (rhs),
					       TREE_CODE (rhs),
					       TREE_TYPE (rhs), val,
					       TREE_OPERAND (rhs, 1),
					       TREE_OPERAND (rhs, 2));
		    }
		  else if (TREE_CODE (rhs) == MEM_REF
			   && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME)
		    {
		      tree val = (*valueize) (TREE_OPERAND (rhs, 0));
		      if (TREE_CODE (val) == ADDR_EXPR
			  && is_gimple_min_invariant (val))
			{
			  tree tem = fold_build2 (MEM_REF, TREE_TYPE (rhs),
						  unshare_expr (val),
						  TREE_OPERAND (rhs, 1));
			  if (tem)
			    rhs = tem;
			}
		    }
		  return fold_const_aggregate_ref_1 (rhs, valueize);
		}
              else if (kind == tcc_declaration)
                return get_symbol_constant_value (rhs);
              return rhs;
            }

          case GIMPLE_UNARY_RHS:
	    return NULL_TREE;

          case GIMPLE_BINARY_RHS:
	    /* Translate &x + CST into an invariant form suitable for
	       further propagation.  */
	    if (subcode == POINTER_PLUS_EXPR)
	      {
		tree op0 = (*valueize) (gimple_assign_rhs1 (stmt));
		tree op1 = (*valueize) (gimple_assign_rhs2 (stmt));
		if (TREE_CODE (op0) == ADDR_EXPR
		    && TREE_CODE (op1) == INTEGER_CST)
		  {
		    tree off = fold_convert (ptr_type_node, op1);
		    return build_fold_addr_expr_loc
			(loc,
			 fold_build2 (MEM_REF,
				      TREE_TYPE (TREE_TYPE (op0)),
				      unshare_expr (op0), off));
		  }
	      }
	    /* Canonicalize bool != 0 and bool == 0 appearing after
	       valueization.  While gimple_simplify handles this
	       it can get confused by the ~X == 1 -> X == 0 transform
	       which we cant reduce to a SSA name or a constant
	       (and we have no way to tell gimple_simplify to not
	       consider those transforms in the first place).  */
	    else if (subcode == EQ_EXPR
		     || subcode == NE_EXPR)
	      {
		tree lhs = gimple_assign_lhs (stmt);
		tree op0 = gimple_assign_rhs1 (stmt);
		if (useless_type_conversion_p (TREE_TYPE (lhs),
					       TREE_TYPE (op0)))
		  {
		    tree op1 = (*valueize) (gimple_assign_rhs2 (stmt));
		    op0 = (*valueize) (op0);
		    if (TREE_CODE (op0) == INTEGER_CST)
		      std::swap (op0, op1);
		    if (TREE_CODE (op1) == INTEGER_CST
			&& ((subcode == NE_EXPR && integer_zerop (op1))
			    || (subcode == EQ_EXPR && integer_onep (op1))))
		      return op0;
		  }
	      }
	    return NULL_TREE;

          case GIMPLE_TERNARY_RHS:
            {
              /* Handle ternary operators that can appear in GIMPLE form.  */
              tree op0 = (*valueize) (gimple_assign_rhs1 (stmt));
              tree op1 = (*valueize) (gimple_assign_rhs2 (stmt));
              tree op2 = (*valueize) (gimple_assign_rhs3 (stmt));
              return fold_ternary_loc (loc, subcode,
				       gimple_expr_type (stmt), op0, op1, op2);
            }

          default:
            gcc_unreachable ();
          }
      }

    case GIMPLE_CALL:
      {
	tree fn;
	gcall *call_stmt = as_a <gcall *> (stmt);

	if (gimple_call_internal_p (stmt))
	  {
	    enum tree_code subcode = ERROR_MARK;
	    switch (gimple_call_internal_fn (stmt))
	      {
	      case IFN_UBSAN_CHECK_ADD:
		subcode = PLUS_EXPR;
		break;
	      case IFN_UBSAN_CHECK_SUB:
		subcode = MINUS_EXPR;
		break;
	      case IFN_UBSAN_CHECK_MUL:
		subcode = MULT_EXPR;
		break;
	      case IFN_BUILTIN_EXPECT:
		  {
		    tree arg0 = gimple_call_arg (stmt, 0);
		    tree op0 = (*valueize) (arg0);
		    if (TREE_CODE (op0) == INTEGER_CST)
		      return op0;
		    return NULL_TREE;
		  }
	      default:
		return NULL_TREE;
	      }
	    tree arg0 = gimple_call_arg (stmt, 0);
	    tree arg1 = gimple_call_arg (stmt, 1);
	    tree op0 = (*valueize) (arg0);
	    tree op1 = (*valueize) (arg1);

	    if (TREE_CODE (op0) != INTEGER_CST
		|| TREE_CODE (op1) != INTEGER_CST)
	      {
		switch (subcode)
		  {
		  case MULT_EXPR:
		    /* x * 0 = 0 * x = 0 without overflow.  */
		    if (integer_zerop (op0) || integer_zerop (op1))
		      return build_zero_cst (TREE_TYPE (arg0));
		    break;
		  case MINUS_EXPR:
		    /* y - y = 0 without overflow.  */
		    if (operand_equal_p (op0, op1, 0))
		      return build_zero_cst (TREE_TYPE (arg0));
		    break;
		  default:
		    break;
		  }
	      }
	    tree res
	      = fold_binary_loc (loc, subcode, TREE_TYPE (arg0), op0, op1);
	    if (res
		&& TREE_CODE (res) == INTEGER_CST
		&& !TREE_OVERFLOW (res))
	      return res;
	    return NULL_TREE;
	  }

	fn = (*valueize) (gimple_call_fn (stmt));
	if (TREE_CODE (fn) == ADDR_EXPR
	    && TREE_CODE (TREE_OPERAND (fn, 0)) == FUNCTION_DECL
	    && DECL_BUILT_IN (TREE_OPERAND (fn, 0))
	    && gimple_builtin_call_types_compatible_p (stmt,
						       TREE_OPERAND (fn, 0)))
	  {
	    tree *args = XALLOCAVEC (tree, gimple_call_num_args (stmt));
	    tree retval;
	    unsigned i;
	    for (i = 0; i < gimple_call_num_args (stmt); ++i)
	      args[i] = (*valueize) (gimple_call_arg (stmt, i));
	    retval = fold_builtin_call_array (loc,
					 gimple_call_return_type (call_stmt),
					 fn, gimple_call_num_args (stmt), args);
	    if (retval)
	      {
		/* fold_call_expr wraps the result inside a NOP_EXPR.  */
		STRIP_NOPS (retval);
		retval = fold_convert (gimple_call_return_type (call_stmt),
				       retval);
	      }
	    return retval;
	  }
	return NULL_TREE;
      }

    default:
      return NULL_TREE;
    }
}

/* Fold STMT to a constant using VALUEIZE to valueize SSA names.
   Returns NULL_TREE if folding to a constant is not possible, otherwise
   returns a constant according to is_gimple_min_invariant.  */

tree
gimple_fold_stmt_to_constant (gimple *stmt, tree (*valueize) (tree))
{
  tree res = gimple_fold_stmt_to_constant_1 (stmt, valueize);
  if (res && is_gimple_min_invariant (res))
    return res;
  return NULL_TREE;
}


/* The following set of functions are supposed to fold references using
   their constant initializers.  */

/* See if we can find constructor defining value of BASE.
   When we know the consructor with constant offset (such as
   base is array[40] and we do know constructor of array), then
   BIT_OFFSET is adjusted accordingly.

   As a special case, return error_mark_node when constructor
   is not explicitly available, but it is known to be zero
   such as 'static const int a;'.  */
static tree
get_base_constructor (tree base, HOST_WIDE_INT *bit_offset,
		      tree (*valueize)(tree))
{
  HOST_WIDE_INT bit_offset2, size, max_size;
  bool reverse;

  if (TREE_CODE (base) == MEM_REF)
    {
      if (!integer_zerop (TREE_OPERAND (base, 1)))
	{
	  if (!tree_fits_shwi_p (TREE_OPERAND (base, 1)))
	    return NULL_TREE;
	  *bit_offset += (mem_ref_offset (base).to_short_addr ()
			  * BITS_PER_UNIT);
	}

      if (valueize
	  && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME)
	base = valueize (TREE_OPERAND (base, 0));
      if (!base || TREE_CODE (base) != ADDR_EXPR)
        return NULL_TREE;
      base = TREE_OPERAND (base, 0);
    }
  else if (valueize
	   && TREE_CODE (base) == SSA_NAME)
    base = valueize (base);

  /* Get a CONSTRUCTOR.  If BASE is a VAR_DECL, get its
     DECL_INITIAL.  If BASE is a nested reference into another
     ARRAY_REF or COMPONENT_REF, make a recursive call to resolve
     the inner reference.  */
  switch (TREE_CODE (base))
    {
    case VAR_DECL:
    case CONST_DECL:
      {
	tree init = ctor_for_folding (base);

	/* Our semantic is exact opposite of ctor_for_folding;
	   NULL means unknown, while error_mark_node is 0.  */
	if (init == error_mark_node)
	  return NULL_TREE;
	if (!init)
	  return error_mark_node;
	return init;
      }

    case VIEW_CONVERT_EXPR:
      return get_base_constructor (TREE_OPERAND (base, 0),
				   bit_offset, valueize);

    case ARRAY_REF:
    case COMPONENT_REF:
      base = get_ref_base_and_extent (base, &bit_offset2, &size, &max_size,
				      &reverse);
      if (max_size == -1 || size != max_size)
	return NULL_TREE;
      *bit_offset +=  bit_offset2;
      return get_base_constructor (base, bit_offset, valueize);

    case CONSTRUCTOR:
      return base;

    default:
      if (CONSTANT_CLASS_P (base))
	return base;

      return NULL_TREE;
    }
}

/* CTOR is CONSTRUCTOR of an array type.  Fold reference of type TYPE and size
   SIZE to the memory at bit OFFSET.  */

static tree
fold_array_ctor_reference (tree type, tree ctor,
			   unsigned HOST_WIDE_INT offset,
			   unsigned HOST_WIDE_INT size,
			   tree from_decl)
{
  offset_int low_bound;
  offset_int elt_size;
  offset_int access_index;
  tree domain_type = NULL_TREE;
  HOST_WIDE_INT inner_offset;

  /* Compute low bound and elt size.  */
  if (TREE_CODE (TREE_TYPE (ctor)) == ARRAY_TYPE)
    domain_type = TYPE_DOMAIN (TREE_TYPE (ctor));
  if (domain_type && TYPE_MIN_VALUE (domain_type))
    {
      /* Static constructors for variably sized objects makes no sense.  */
      if (TREE_CODE (TYPE_MIN_VALUE (domain_type)) != INTEGER_CST)
	return NULL_TREE;
      low_bound = wi::to_offset (TYPE_MIN_VALUE (domain_type));
    }
  else
    low_bound = 0;
  /* Static constructors for variably sized objects makes no sense.  */
  if (TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (ctor)))) != INTEGER_CST)
    return NULL_TREE;
  elt_size = wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (ctor))));

  /* We can handle only constantly sized accesses that are known to not
     be larger than size of array element.  */
  if (!TYPE_SIZE_UNIT (type)
      || TREE_CODE (TYPE_SIZE_UNIT (type)) != INTEGER_CST
      || elt_size < wi::to_offset (TYPE_SIZE_UNIT (type))
      || elt_size == 0)
    return NULL_TREE;

  /* Compute the array index we look for.  */
  access_index = wi::udiv_trunc (offset_int (offset / BITS_PER_UNIT),
				 elt_size);
  access_index += low_bound;

  /* And offset within the access.  */
  inner_offset = offset % (elt_size.to_uhwi () * BITS_PER_UNIT);

  /* See if the array field is large enough to span whole access.  We do not
     care to fold accesses spanning multiple array indexes.  */
  if (inner_offset + size > elt_size.to_uhwi () * BITS_PER_UNIT)
    return NULL_TREE;
  if (tree val = get_array_ctor_element_at_index (ctor, access_index))
    return fold_ctor_reference (type, val, inner_offset, size, from_decl);

  /* When memory is not explicitely mentioned in constructor,
     it is 0 (or out of range).  */
  return build_zero_cst (type);
}

/* CTOR is CONSTRUCTOR of an aggregate or vector.
   Fold reference of type TYPE and size SIZE to the memory at bit OFFSET.  */

static tree
fold_nonarray_ctor_reference (tree type, tree ctor,
			      unsigned HOST_WIDE_INT offset,
			      unsigned HOST_WIDE_INT size,
			      tree from_decl)
{
  unsigned HOST_WIDE_INT cnt;
  tree cfield, cval;

  FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor), cnt, cfield,
			    cval)
    {
      tree byte_offset = DECL_FIELD_OFFSET (cfield);
      tree field_offset = DECL_FIELD_BIT_OFFSET (cfield);
      tree field_size = DECL_SIZE (cfield);
      offset_int bitoffset;
      offset_int bitoffset_end, access_end;

      /* Variable sized objects in static constructors makes no sense,
	 but field_size can be NULL for flexible array members.  */
      gcc_assert (TREE_CODE (field_offset) == INTEGER_CST
		  && TREE_CODE (byte_offset) == INTEGER_CST
		  && (field_size != NULL_TREE
		      ? TREE_CODE (field_size) == INTEGER_CST
		      : TREE_CODE (TREE_TYPE (cfield)) == ARRAY_TYPE));

      /* Compute bit offset of the field.  */
      bitoffset = (wi::to_offset (field_offset)
		   + (wi::to_offset (byte_offset) << LOG2_BITS_PER_UNIT));
      /* Compute bit offset where the field ends.  */
      if (field_size != NULL_TREE)
	bitoffset_end = bitoffset + wi::to_offset (field_size);
      else
	bitoffset_end = 0;

      access_end = offset_int (offset) + size;

      /* Is there any overlap between [OFFSET, OFFSET+SIZE) and
	 [BITOFFSET, BITOFFSET_END)?  */
      if (wi::cmps (access_end, bitoffset) > 0
	  && (field_size == NULL_TREE
	      || wi::lts_p (offset, bitoffset_end)))
	{
	  offset_int inner_offset = offset_int (offset) - bitoffset;
	  /* We do have overlap.  Now see if field is large enough to
	     cover the access.  Give up for accesses spanning multiple
	     fields.  */
	  if (wi::cmps (access_end, bitoffset_end) > 0)
	    return NULL_TREE;
	  if (offset < bitoffset)
	    return NULL_TREE;
	  return fold_ctor_reference (type, cval,
				      inner_offset.to_uhwi (), size,
				      from_decl);
	}
    }
  /* When memory is not explicitely mentioned in constructor, it is 0.  */
  return build_zero_cst (type);
}

/* CTOR is value initializing memory, fold reference of type TYPE and size SIZE
   to the memory at bit OFFSET.  */

tree
fold_ctor_reference (tree type, tree ctor, unsigned HOST_WIDE_INT offset,
		     unsigned HOST_WIDE_INT size, tree from_decl)
{
  tree ret;

  /* We found the field with exact match.  */
  if (useless_type_conversion_p (type, TREE_TYPE (ctor))
      && !offset)
    return canonicalize_constructor_val (unshare_expr (ctor), from_decl);

  /* We are at the end of walk, see if we can view convert the
     result.  */
  if (!AGGREGATE_TYPE_P (TREE_TYPE (ctor)) && !offset
      /* VIEW_CONVERT_EXPR is defined only for matching sizes.  */
      && !compare_tree_int (TYPE_SIZE (type), size)
      && !compare_tree_int (TYPE_SIZE (TREE_TYPE (ctor)), size))
    {
      ret = canonicalize_constructor_val (unshare_expr (ctor), from_decl);
      ret = fold_unary (VIEW_CONVERT_EXPR, type, ret);
      if (ret)
	STRIP_USELESS_TYPE_CONVERSION (ret);
      return ret;
    }
  /* For constants and byte-aligned/sized reads try to go through
     native_encode/interpret.  */
  if (CONSTANT_CLASS_P (ctor)
      && BITS_PER_UNIT == 8
      && offset % BITS_PER_UNIT == 0
      && size % BITS_PER_UNIT == 0
      && size <= MAX_BITSIZE_MODE_ANY_MODE)
    {
      unsigned char buf[MAX_BITSIZE_MODE_ANY_MODE / BITS_PER_UNIT];
      int len = native_encode_expr (ctor, buf, size / BITS_PER_UNIT,
				    offset / BITS_PER_UNIT);
      if (len > 0)
	return native_interpret_expr (type, buf, len);
    }
  if (TREE_CODE (ctor) == CONSTRUCTOR)
    {

      if (TREE_CODE (TREE_TYPE (ctor)) == ARRAY_TYPE
	  || TREE_CODE (TREE_TYPE (ctor)) == VECTOR_TYPE)
	return fold_array_ctor_reference (type, ctor, offset, size,
					  from_decl);
      else
	return fold_nonarray_ctor_reference (type, ctor, offset, size,
					     from_decl);
    }

  return NULL_TREE;
}

/* Return the tree representing the element referenced by T if T is an
   ARRAY_REF or COMPONENT_REF into constant aggregates valuezing SSA
   names using VALUEIZE.  Return NULL_TREE otherwise.  */

tree
fold_const_aggregate_ref_1 (tree t, tree (*valueize) (tree))
{
  tree ctor, idx, base;
  HOST_WIDE_INT offset, size, max_size;
  tree tem;
  bool reverse;

  if (TREE_THIS_VOLATILE (t))
    return NULL_TREE;

  if (DECL_P (t))
    return get_symbol_constant_value (t);

  tem = fold_read_from_constant_string (t);
  if (tem)
    return tem;

  switch (TREE_CODE (t))
    {
    case ARRAY_REF:
    case ARRAY_RANGE_REF:
      /* Constant indexes are handled well by get_base_constructor.
	 Only special case variable offsets.
	 FIXME: This code can't handle nested references with variable indexes
	 (they will be handled only by iteration of ccp).  Perhaps we can bring
	 get_ref_base_and_extent here and make it use a valueize callback.  */
      if (TREE_CODE (TREE_OPERAND (t, 1)) == SSA_NAME
	  && valueize
	  && (idx = (*valueize) (TREE_OPERAND (t, 1)))
	  && TREE_CODE (idx) == INTEGER_CST)
	{
	  tree low_bound, unit_size;

	  /* If the resulting bit-offset is constant, track it.  */
	  if ((low_bound = array_ref_low_bound (t),
	       TREE_CODE (low_bound) == INTEGER_CST)
	      && (unit_size = array_ref_element_size (t),
		  tree_fits_uhwi_p (unit_size)))
	    {
	      offset_int woffset
		= wi::sext (wi::to_offset (idx) - wi::to_offset (low_bound),
			    TYPE_PRECISION (TREE_TYPE (idx)));

	      if (wi::fits_shwi_p (woffset))
		{
		  offset = woffset.to_shwi ();
		  /* TODO: This code seems wrong, multiply then check
		     to see if it fits.  */
		  offset *= tree_to_uhwi (unit_size);
		  offset *= BITS_PER_UNIT;

		  base = TREE_OPERAND (t, 0);
		  ctor = get_base_constructor (base, &offset, valueize);
		  /* Empty constructor.  Always fold to 0.  */
		  if (ctor == error_mark_node)
		    return build_zero_cst (TREE_TYPE (t));
		  /* Out of bound array access.  Value is undefined,
		     but don't fold.  */
		  if (offset < 0)
		    return NULL_TREE;
		  /* We can not determine ctor.  */
		  if (!ctor)
		    return NULL_TREE;
		  return fold_ctor_reference (TREE_TYPE (t), ctor, offset,
					      tree_to_uhwi (unit_size)
					      * BITS_PER_UNIT,
					      base);
		}
	    }
	}
      /* Fallthru.  */

    case COMPONENT_REF:
    case BIT_FIELD_REF:
    case TARGET_MEM_REF:
    case MEM_REF:
      base = get_ref_base_and_extent (t, &offset, &size, &max_size, &reverse);
      ctor = get_base_constructor (base, &offset, valueize);

      /* Empty constructor.  Always fold to 0.  */
      if (ctor == error_mark_node)
	return build_zero_cst (TREE_TYPE (t));
      /* We do not know precise address.  */
      if (max_size == -1 || max_size != size)
	return NULL_TREE;
      /* We can not determine ctor.  */
      if (!ctor)
	return NULL_TREE;

      /* Out of bound array access.  Value is undefined, but don't fold.  */
      if (offset < 0)
	return NULL_TREE;

      return fold_ctor_reference (TREE_TYPE (t), ctor, offset, size,
				  base);

    case REALPART_EXPR:
    case IMAGPART_EXPR:
      {
	tree c = fold_const_aggregate_ref_1 (TREE_OPERAND (t, 0), valueize);
	if (c && TREE_CODE (c) == COMPLEX_CST)
	  return fold_build1_loc (EXPR_LOCATION (t),
			      TREE_CODE (t), TREE_TYPE (t), c);
	break;
      }

    default:
      break;
    }

  return NULL_TREE;
}

tree
fold_const_aggregate_ref (tree t)
{
  return fold_const_aggregate_ref_1 (t, NULL);
}

/* Lookup virtual method with index TOKEN in a virtual table V
   at OFFSET.  
   Set CAN_REFER if non-NULL to false if method
   is not referable or if the virtual table is ill-formed (such as rewriten
   by non-C++ produced symbol). Otherwise just return NULL in that calse.  */

tree
gimple_get_virt_method_for_vtable (HOST_WIDE_INT token,
				   tree v,
				   unsigned HOST_WIDE_INT offset,
				   bool *can_refer)
{
  tree vtable = v, init, fn;
  unsigned HOST_WIDE_INT size;
  unsigned HOST_WIDE_INT elt_size, access_index;
  tree domain_type;

  if (can_refer)
    *can_refer = true;

  /* First of all double check we have virtual table.  */
  if (!VAR_P (v) || !DECL_VIRTUAL_P (v))
    {
      /* Pass down that we lost track of the target.  */
      if (can_refer)
	*can_refer = false;
      return NULL_TREE;
    }

  init = ctor_for_folding (v);

  /* The virtual tables should always be born with constructors
     and we always should assume that they are avaialble for
     folding.  At the moment we do not stream them in all cases,
     but it should never happen that ctor seem unreachable.  */
  gcc_assert (init);
  if (init == error_mark_node)
    {
      gcc_assert (in_lto_p);
      /* Pass down that we lost track of the target.  */
      if (can_refer)
	*can_refer = false;
      return NULL_TREE;
    }
  gcc_checking_assert (TREE_CODE (TREE_TYPE (v)) == ARRAY_TYPE);
  size = tree_to_uhwi (TYPE_SIZE (TREE_TYPE (TREE_TYPE (v))));
  offset *= BITS_PER_UNIT;
  offset += token * size;

  /* Lookup the value in the constructor that is assumed to be array.
     This is equivalent to
     fn = fold_ctor_reference (TREE_TYPE (TREE_TYPE (v)), init,
			       offset, size, NULL);
     but in a constant time.  We expect that frontend produced a simple
     array without indexed initializers.  */

  gcc_checking_assert (TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE);
  domain_type = TYPE_DOMAIN (TREE_TYPE (init));
  gcc_checking_assert (integer_zerop (TYPE_MIN_VALUE (domain_type)));
  elt_size = tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (init))));

  access_index = offset / BITS_PER_UNIT / elt_size;
  gcc_checking_assert (offset % (elt_size * BITS_PER_UNIT) == 0);

  /* This code makes an assumption that there are no 
     indexed fileds produced by C++ FE, so we can directly index the array. */
  if (access_index < CONSTRUCTOR_NELTS (init))
    {
      fn = CONSTRUCTOR_ELT (init, access_index)->value;
      gcc_checking_assert (!CONSTRUCTOR_ELT (init, access_index)->index);
      STRIP_NOPS (fn);
    }
  else
    fn = NULL;

  /* For type inconsistent program we may end up looking up virtual method
     in virtual table that does not contain TOKEN entries.  We may overrun
     the virtual table and pick up a constant or RTTI info pointer.
     In any case the call is undefined.  */
  if (!fn
      || (TREE_CODE (fn) != ADDR_EXPR && TREE_CODE (fn) != FDESC_EXPR)
      || TREE_CODE (TREE_OPERAND (fn, 0)) != FUNCTION_DECL)
    fn = builtin_decl_implicit (BUILT_IN_UNREACHABLE);
  else
    {
      fn = TREE_OPERAND (fn, 0);

      /* When cgraph node is missing and function is not public, we cannot
	 devirtualize.  This can happen in WHOPR when the actual method
	 ends up in other partition, because we found devirtualization
	 possibility too late.  */
      if (!can_refer_decl_in_current_unit_p (fn, vtable))
	{
	  if (can_refer)
	    {
	      *can_refer = false;
	      return fn;
	    }
	  return NULL_TREE;
	}
    }

  /* Make sure we create a cgraph node for functions we'll reference.
     They can be non-existent if the reference comes from an entry
     of an external vtable for example.  */
  cgraph_node::get_create (fn);

  return fn;
}

/* Return a declaration of a function which an OBJ_TYPE_REF references. TOKEN
   is integer form of OBJ_TYPE_REF_TOKEN of the reference expression.
   KNOWN_BINFO carries the binfo describing the true type of
   OBJ_TYPE_REF_OBJECT(REF).
   Set CAN_REFER if non-NULL to false if method
   is not referable or if the virtual table is ill-formed (such as rewriten
   by non-C++ produced symbol). Otherwise just return NULL in that calse.  */

tree
gimple_get_virt_method_for_binfo (HOST_WIDE_INT token, tree known_binfo,
				  bool *can_refer)
{
  unsigned HOST_WIDE_INT offset;
  tree v;

  v = BINFO_VTABLE (known_binfo);
  /* If there is no virtual methods table, leave the OBJ_TYPE_REF alone.  */
  if (!v)
    return NULL_TREE;

  if (!vtable_pointer_value_to_vtable (v, &v, &offset))
    {
      if (can_refer)
	*can_refer = false;
      return NULL_TREE;
    }
  return gimple_get_virt_method_for_vtable (token, v, offset, can_refer);
}

/* Given a pointer value OP0, return a simplified version of an
   indirection through OP0, or NULL_TREE if no simplification is
   possible.  Note that the resulting type may be different from
   the type pointed to in the sense that it is still compatible
   from the langhooks point of view. */

tree
gimple_fold_indirect_ref (tree t)
{
  tree ptype = TREE_TYPE (t), type = TREE_TYPE (ptype);
  tree sub = t;
  tree subtype;

  STRIP_NOPS (sub);
  subtype = TREE_TYPE (sub);
  if (!POINTER_TYPE_P (subtype))
    return NULL_TREE;

  if (TREE_CODE (sub) == ADDR_EXPR)
    {
      tree op = TREE_OPERAND (sub, 0);
      tree optype = TREE_TYPE (op);
      /* *&p => p */
      if (useless_type_conversion_p (type, optype))
        return op;

      /* *(foo *)&fooarray => fooarray[0] */
      if (TREE_CODE (optype) == ARRAY_TYPE
	  && TREE_CODE (TYPE_SIZE (TREE_TYPE (optype))) == INTEGER_CST
	  && useless_type_conversion_p (type, TREE_TYPE (optype)))
       {
         tree type_domain = TYPE_DOMAIN (optype);
         tree min_val = size_zero_node;
         if (type_domain && TYPE_MIN_VALUE (type_domain))
           min_val = TYPE_MIN_VALUE (type_domain);
	 if (TREE_CODE (min_val) == INTEGER_CST)
	   return build4 (ARRAY_REF, type, op, min_val, NULL_TREE, NULL_TREE);
       }
      /* *(foo *)&complexfoo => __real__ complexfoo */
      else if (TREE_CODE (optype) == COMPLEX_TYPE
               && useless_type_conversion_p (type, TREE_TYPE (optype)))
        return fold_build1 (REALPART_EXPR, type, op);
      /* *(foo *)&vectorfoo => BIT_FIELD_REF<vectorfoo,...> */
      else if (TREE_CODE (optype) == VECTOR_TYPE
               && useless_type_conversion_p (type, TREE_TYPE (optype)))
        {
          tree part_width = TYPE_SIZE (type);
          tree index = bitsize_int (0);
          return fold_build3 (BIT_FIELD_REF, type, op, part_width, index);
        }
    }

  /* *(p + CST) -> ...  */
  if (TREE_CODE (sub) == POINTER_PLUS_EXPR
      && TREE_CODE (TREE_OPERAND (sub, 1)) == INTEGER_CST)
    {
      tree addr = TREE_OPERAND (sub, 0);
      tree off = TREE_OPERAND (sub, 1);
      tree addrtype;

      STRIP_NOPS (addr);
      addrtype = TREE_TYPE (addr);

      /* ((foo*)&vectorfoo)[1] -> BIT_FIELD_REF<vectorfoo,...> */
      if (TREE_CODE (addr) == ADDR_EXPR
	  && TREE_CODE (TREE_TYPE (addrtype)) == VECTOR_TYPE
	  && useless_type_conversion_p (type, TREE_TYPE (TREE_TYPE (addrtype)))
	  && tree_fits_uhwi_p (off))
	{
          unsigned HOST_WIDE_INT offset = tree_to_uhwi (off);
          tree part_width = TYPE_SIZE (type);
          unsigned HOST_WIDE_INT part_widthi
            = tree_to_shwi (part_width) / BITS_PER_UNIT;
          unsigned HOST_WIDE_INT indexi = offset * BITS_PER_UNIT;
          tree index = bitsize_int (indexi);
          if (offset / part_widthi
	      < TYPE_VECTOR_SUBPARTS (TREE_TYPE (addrtype)))
            return fold_build3 (BIT_FIELD_REF, type, TREE_OPERAND (addr, 0),
                                part_width, index);
	}

      /* ((foo*)&complexfoo)[1] -> __imag__ complexfoo */
      if (TREE_CODE (addr) == ADDR_EXPR
	  && TREE_CODE (TREE_TYPE (addrtype)) == COMPLEX_TYPE
	  && useless_type_conversion_p (type, TREE_TYPE (TREE_TYPE (addrtype))))
        {
          tree size = TYPE_SIZE_UNIT (type);
          if (tree_int_cst_equal (size, off))
            return fold_build1 (IMAGPART_EXPR, type, TREE_OPERAND (addr, 0));
        }

      /* *(p + CST) -> MEM_REF <p, CST>.  */
      if (TREE_CODE (addr) != ADDR_EXPR
	  || DECL_P (TREE_OPERAND (addr, 0)))
	return fold_build2 (MEM_REF, type,
			    addr,
			    wide_int_to_tree (ptype, off));
    }

  /* *(foo *)fooarrptr => (*fooarrptr)[0] */
  if (TREE_CODE (TREE_TYPE (subtype)) == ARRAY_TYPE
      && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (subtype)))) == INTEGER_CST
      && useless_type_conversion_p (type, TREE_TYPE (TREE_TYPE (subtype))))
    {
      tree type_domain;
      tree min_val = size_zero_node;
      tree osub = sub;
      sub = gimple_fold_indirect_ref (sub);
      if (! sub)
	sub = build1 (INDIRECT_REF, TREE_TYPE (subtype), osub);
      type_domain = TYPE_DOMAIN (TREE_TYPE (sub));
      if (type_domain && TYPE_MIN_VALUE (type_domain))
        min_val = TYPE_MIN_VALUE (type_domain);
      if (TREE_CODE (min_val) == INTEGER_CST)
	return build4 (ARRAY_REF, type, sub, min_val, NULL_TREE, NULL_TREE);
    }

  return NULL_TREE;
}

/* Return true if CODE is an operation that when operating on signed
   integer types involves undefined behavior on overflow and the
   operation can be expressed with unsigned arithmetic.  */

bool
arith_code_with_undefined_signed_overflow (tree_code code)
{
  switch (code)
    {
    case PLUS_EXPR:
    case MINUS_EXPR:
    case MULT_EXPR:
    case NEGATE_EXPR:
    case POINTER_PLUS_EXPR:
      return true;
    default:
      return false;
    }
}

/* Rewrite STMT, an assignment with a signed integer or pointer arithmetic
   operation that can be transformed to unsigned arithmetic by converting
   its operand, carrying out the operation in the corresponding unsigned
   type and converting the result back to the original type.

   Returns a sequence of statements that replace STMT and also contain
   a modified form of STMT itself.  */

gimple_seq
rewrite_to_defined_overflow (gimple *stmt)
{
  if (dump_file && (dump_flags & TDF_DETAILS))
    {
      fprintf (dump_file, "rewriting stmt with undefined signed "
	       "overflow ");
      print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM);
    }

  tree lhs = gimple_assign_lhs (stmt);
  tree type = unsigned_type_for (TREE_TYPE (lhs));
  gimple_seq stmts = NULL;
  for (unsigned i = 1; i < gimple_num_ops (stmt); ++i)
    {
      tree op = gimple_op (stmt, i);
      op = gimple_convert (&stmts, type, op);
      gimple_set_op (stmt, i, op);
    }
  gimple_assign_set_lhs (stmt, make_ssa_name (type, stmt));
  if (gimple_assign_rhs_code (stmt) == POINTER_PLUS_EXPR)
    gimple_assign_set_rhs_code (stmt, PLUS_EXPR);
  gimple_seq_add_stmt (&stmts, stmt);
  gimple *cvt = gimple_build_assign (lhs, NOP_EXPR, gimple_assign_lhs (stmt));
  gimple_seq_add_stmt (&stmts, cvt);

  return stmts;
}


/* The valueization hook we use for the gimple_build API simplification.
   This makes us match fold_buildN behavior by only combining with
   statements in the sequence(s) we are currently building.  */

static tree
gimple_build_valueize (tree op)
{
  if (gimple_bb (SSA_NAME_DEF_STMT (op)) == NULL)
    return op;
  return NULL_TREE;
}

/* Build the expression CODE OP0 of type TYPE with location LOC,
   simplifying it first if possible.  Returns the built
   expression value and appends statements possibly defining it
   to SEQ.  */

tree
gimple_build (gimple_seq *seq, location_t loc,
	      enum tree_code code, tree type, tree op0)
{
  tree res = gimple_simplify (code, type, op0, seq, gimple_build_valueize);
  if (!res)
    {
      res = create_tmp_reg_or_ssa_name (type);
      gimple *stmt;
      if (code == REALPART_EXPR
	  || code == IMAGPART_EXPR
	  || code == VIEW_CONVERT_EXPR)
	stmt = gimple_build_assign (res, code, build1 (code, type, op0));
      else
	stmt = gimple_build_assign (res, code, op0);
      gimple_set_location (stmt, loc);
      gimple_seq_add_stmt_without_update (seq, stmt);
    }
  return res;
}

/* Build the expression OP0 CODE OP1 of type TYPE with location LOC,
   simplifying it first if possible.  Returns the built
   expression value and appends statements possibly defining it
   to SEQ.  */

tree
gimple_build (gimple_seq *seq, location_t loc,
	      enum tree_code code, tree type, tree op0, tree op1)
{
  tree res = gimple_simplify (code, type, op0, op1, seq, gimple_build_valueize);
  if (!res)
    {
      res = create_tmp_reg_or_ssa_name (type);
      gimple *stmt = gimple_build_assign (res, code, op0, op1);
      gimple_set_location (stmt, loc);
      gimple_seq_add_stmt_without_update (seq, stmt);
    }
  return res;
}

/* Build the expression (CODE OP0 OP1 OP2) of type TYPE with location LOC,
   simplifying it first if possible.  Returns the built
   expression value and appends statements possibly defining it
   to SEQ.  */

tree
gimple_build (gimple_seq *seq, location_t loc,
	      enum tree_code code, tree type, tree op0, tree op1, tree op2)
{
  tree res = gimple_simplify (code, type, op0, op1, op2,
			      seq, gimple_build_valueize);
  if (!res)
    {
      res = create_tmp_reg_or_ssa_name (type);
      gimple *stmt;
      if (code == BIT_FIELD_REF)
	stmt = gimple_build_assign (res, code,
				    build3 (code, type, op0, op1, op2));
      else
	stmt = gimple_build_assign (res, code, op0, op1, op2);
      gimple_set_location (stmt, loc);
      gimple_seq_add_stmt_without_update (seq, stmt);
    }
  return res;
}

/* Build the call FN (ARG0) with a result of type TYPE
   (or no result if TYPE is void) with location LOC,
   simplifying it first if possible.  Returns the built
   expression value (or NULL_TREE if TYPE is void) and appends
   statements possibly defining it to SEQ.  */

tree
gimple_build (gimple_seq *seq, location_t loc,
	      enum built_in_function fn, tree type, tree arg0)
{
  tree res = gimple_simplify (fn, type, arg0, seq, gimple_build_valueize);
  if (!res)
    {
      tree decl = builtin_decl_implicit (fn);
      gimple *stmt = gimple_build_call (decl, 1, arg0);
      if (!VOID_TYPE_P (type))
	{
	  res = create_tmp_reg_or_ssa_name (type);
	  gimple_call_set_lhs (stmt, res);
	}
      gimple_set_location (stmt, loc);
      gimple_seq_add_stmt_without_update (seq, stmt);
    }
  return res;
}

/* Build the call FN (ARG0, ARG1) with a result of type TYPE
   (or no result if TYPE is void) with location LOC,
   simplifying it first if possible.  Returns the built
   expression value (or NULL_TREE if TYPE is void) and appends
   statements possibly defining it to SEQ.  */

tree
gimple_build (gimple_seq *seq, location_t loc,
	      enum built_in_function fn, tree type, tree arg0, tree arg1)
{
  tree res = gimple_simplify (fn, type, arg0, arg1, seq, gimple_build_valueize);
  if (!res)
    {
      tree decl = builtin_decl_implicit (fn);
      gimple *stmt = gimple_build_call (decl, 2, arg0, arg1);
      if (!VOID_TYPE_P (type))
	{
	  res = create_tmp_reg_or_ssa_name (type);
	  gimple_call_set_lhs (stmt, res);
	}
      gimple_set_location (stmt, loc);
      gimple_seq_add_stmt_without_update (seq, stmt);
    }
  return res;
}

/* Build the call FN (ARG0, ARG1, ARG2) with a result of type TYPE
   (or no result if TYPE is void) with location LOC,
   simplifying it first if possible.  Returns the built
   expression value (or NULL_TREE if TYPE is void) and appends
   statements possibly defining it to SEQ.  */

tree
gimple_build (gimple_seq *seq, location_t loc,
	      enum built_in_function fn, tree type,
	      tree arg0, tree arg1, tree arg2)
{
  tree res = gimple_simplify (fn, type, arg0, arg1, arg2,
			      seq, gimple_build_valueize);
  if (!res)
    {
      tree decl = builtin_decl_implicit (fn);
      gimple *stmt = gimple_build_call (decl, 3, arg0, arg1, arg2);
      if (!VOID_TYPE_P (type))
	{
	  res = create_tmp_reg_or_ssa_name (type);
	  gimple_call_set_lhs (stmt, res);
	}
      gimple_set_location (stmt, loc);
      gimple_seq_add_stmt_without_update (seq, stmt);
    }
  return res;
}

/* Build the conversion (TYPE) OP with a result of type TYPE
   with location LOC if such conversion is neccesary in GIMPLE,
   simplifying it first.
   Returns the built expression value and appends
   statements possibly defining it to SEQ.  */

tree
gimple_convert (gimple_seq *seq, location_t loc, tree type, tree op)
{
  if (useless_type_conversion_p (type, TREE_TYPE (op)))
    return op;
  return gimple_build (seq, loc, NOP_EXPR, type, op);
}

/* Build the conversion (ptrofftype) OP with a result of a type
   compatible with ptrofftype with location LOC if such conversion
   is neccesary in GIMPLE, simplifying it first.
   Returns the built expression value and appends
   statements possibly defining it to SEQ.  */

tree
gimple_convert_to_ptrofftype (gimple_seq *seq, location_t loc, tree op)
{
  if (ptrofftype_p (TREE_TYPE (op)))
    return op;
  return gimple_convert (seq, loc, sizetype, op);
}

/* Return true if the result of assignment STMT is known to be non-negative.
   If the return value is based on the assumption that signed overflow is
   undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't change
   *STRICT_OVERFLOW_P.  DEPTH is the current nesting depth of the query.  */

static bool
gimple_assign_nonnegative_warnv_p (gimple *stmt, bool *strict_overflow_p,
				   int depth)
{
  enum tree_code code = gimple_assign_rhs_code (stmt);
  switch (get_gimple_rhs_class (code))
    {
    case GIMPLE_UNARY_RHS:
      return tree_unary_nonnegative_warnv_p (gimple_assign_rhs_code (stmt),
					     gimple_expr_type (stmt),
					     gimple_assign_rhs1 (stmt),
					     strict_overflow_p, depth);
    case GIMPLE_BINARY_RHS:
      return tree_binary_nonnegative_warnv_p (gimple_assign_rhs_code (stmt),
					      gimple_expr_type (stmt),
					      gimple_assign_rhs1 (stmt),
					      gimple_assign_rhs2 (stmt),
					      strict_overflow_p, depth);
    case GIMPLE_TERNARY_RHS:
      return false;
    case GIMPLE_SINGLE_RHS:
      return tree_single_nonnegative_warnv_p (gimple_assign_rhs1 (stmt),
					      strict_overflow_p, depth);
    case GIMPLE_INVALID_RHS:
      break;
    }
  gcc_unreachable ();
}

/* Return true if return value of call STMT is known to be non-negative.
   If the return value is based on the assumption that signed overflow is
   undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't change
   *STRICT_OVERFLOW_P.  DEPTH is the current nesting depth of the query.  */

static bool
gimple_call_nonnegative_warnv_p (gimple *stmt, bool *strict_overflow_p,
				 int depth)
{
  tree arg0 = gimple_call_num_args (stmt) > 0 ?
    gimple_call_arg (stmt, 0) : NULL_TREE;
  tree arg1 = gimple_call_num_args (stmt) > 1 ?
    gimple_call_arg (stmt, 1) : NULL_TREE;

  return tree_call_nonnegative_warnv_p (gimple_expr_type (stmt),
					gimple_call_combined_fn (stmt),
					arg0,
					arg1,
					strict_overflow_p, depth);
}

/* Return true if return value of call STMT is known to be non-negative.
   If the return value is based on the assumption that signed overflow is
   undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't change
   *STRICT_OVERFLOW_P.  DEPTH is the current nesting depth of the query.  */

static bool
gimple_phi_nonnegative_warnv_p (gimple *stmt, bool *strict_overflow_p,
				int depth)
{
  for (unsigned i = 0; i < gimple_phi_num_args (stmt); ++i)
    {
      tree arg = gimple_phi_arg_def (stmt, i);
      if (!tree_single_nonnegative_warnv_p (arg, strict_overflow_p, depth + 1))
	return false;
    }
  return true;
}

/* Return true if STMT is known to compute a non-negative value.
   If the return value is based on the assumption that signed overflow is
   undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't change
   *STRICT_OVERFLOW_P.  DEPTH is the current nesting depth of the query.  */

bool
gimple_stmt_nonnegative_warnv_p (gimple *stmt, bool *strict_overflow_p,
				 int depth)
{
  switch (gimple_code (stmt))
    {
    case GIMPLE_ASSIGN:
      return gimple_assign_nonnegative_warnv_p (stmt, strict_overflow_p,
						depth);
    case GIMPLE_CALL:
      return gimple_call_nonnegative_warnv_p (stmt, strict_overflow_p,
					      depth);
    case GIMPLE_PHI:
      return gimple_phi_nonnegative_warnv_p (stmt, strict_overflow_p,
					     depth);
    default:
      return false;
    }
}

/* Return true if the floating-point value computed by assignment STMT
   is known to have an integer value.  We also allow +Inf, -Inf and NaN
   to be considered integer values. Return false for signaling NaN.

   DEPTH is the current nesting depth of the query.  */

static bool
gimple_assign_integer_valued_real_p (gimple *stmt, int depth)
{
  enum tree_code code = gimple_assign_rhs_code (stmt);
  switch (get_gimple_rhs_class (code))
    {
    case GIMPLE_UNARY_RHS:
      return integer_valued_real_unary_p (gimple_assign_rhs_code (stmt),
					  gimple_assign_rhs1 (stmt), depth);
    case GIMPLE_BINARY_RHS:
      return integer_valued_real_binary_p (gimple_assign_rhs_code (stmt),
					   gimple_assign_rhs1 (stmt),
					   gimple_assign_rhs2 (stmt), depth);
    case GIMPLE_TERNARY_RHS:
      return false;
    case GIMPLE_SINGLE_RHS:
      return integer_valued_real_single_p (gimple_assign_rhs1 (stmt), depth);
    case GIMPLE_INVALID_RHS:
      break;
    }
  gcc_unreachable ();
}

/* Return true if the floating-point value computed by call STMT is known
   to have an integer value.  We also allow +Inf, -Inf and NaN to be
   considered integer values. Return false for signaling NaN.

   DEPTH is the current nesting depth of the query.  */

static bool
gimple_call_integer_valued_real_p (gimple *stmt, int depth)
{
  tree arg0 = (gimple_call_num_args (stmt) > 0
	       ? gimple_call_arg (stmt, 0)
	       : NULL_TREE);
  tree arg1 = (gimple_call_num_args (stmt) > 1
	       ? gimple_call_arg (stmt, 1)
	       : NULL_TREE);
  return integer_valued_real_call_p (gimple_call_combined_fn (stmt),
				     arg0, arg1, depth);
}

/* Return true if the floating-point result of phi STMT is known to have
   an integer value.  We also allow +Inf, -Inf and NaN to be considered
   integer values. Return false for signaling NaN.

   DEPTH is the current nesting depth of the query.  */

static bool
gimple_phi_integer_valued_real_p (gimple *stmt, int depth)
{
  for (unsigned i = 0; i < gimple_phi_num_args (stmt); ++i)
    {
      tree arg = gimple_phi_arg_def (stmt, i);
      if (!integer_valued_real_single_p (arg, depth + 1))
	return false;
    }
  return true;
}

/* Return true if the floating-point value computed by STMT is known
   to have an integer value.  We also allow +Inf, -Inf and NaN to be
   considered integer values. Return false for signaling NaN.

   DEPTH is the current nesting depth of the query.  */

bool
gimple_stmt_integer_valued_real_p (gimple *stmt, int depth)
{
  switch (gimple_code (stmt))
    {
    case GIMPLE_ASSIGN:
      return gimple_assign_integer_valued_real_p (stmt, depth);
    case GIMPLE_CALL:
      return gimple_call_integer_valued_real_p (stmt, depth);
    case GIMPLE_PHI:
      return gimple_phi_integer_valued_real_p (stmt, depth);
    default:
      return false;
    }
}