summaryrefslogtreecommitdiff
path: root/gcc/expr.c
blob: 8bb7e41d7404cc85544fbd0d97fd116512ea4f79 (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
/* Convert tree expression to rtl instructions, for GNU compiler.
   Copyright (C) 1988, 1992 Free Software Foundation, Inc.

This file is part of GNU CC.

GNU CC 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 2, or (at your option)
any later version.

GNU CC 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 GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */


#include "config.h"
#include "rtl.h"
#include "tree.h"
#include "flags.h"
#include "function.h"
#include "insn-flags.h"
#include "insn-codes.h"
#include "expr.h"
#include "insn-config.h"
#include "recog.h"
#include "output.h"
#include "gvarargs.h"
#include "typeclass.h"

#define CEIL(x,y) (((x) + (y) - 1) / (y))

/* Decide whether a function's arguments should be processed
   from first to last or from last to first.  */

#ifdef STACK_GROWS_DOWNWARD
#ifdef PUSH_ROUNDING
#define PUSH_ARGS_REVERSED	/* If it's last to first */
#endif
#endif

#ifndef STACK_PUSH_CODE
#ifdef STACK_GROWS_DOWNWARD
#define STACK_PUSH_CODE PRE_DEC
#else
#define STACK_PUSH_CODE PRE_INC
#endif
#endif

/* Like STACK_BOUNDARY but in units of bytes, not bits.  */
#define STACK_BYTES (STACK_BOUNDARY / BITS_PER_UNIT)

/* If this is nonzero, we do not bother generating VOLATILE
   around volatile memory references, and we are willing to
   output indirect addresses.  If cse is to follow, we reject
   indirect addresses so a useful potential cse is generated;
   if it is used only once, instruction combination will produce
   the same indirect address eventually.  */
int cse_not_expected;

/* Nonzero to generate code for all the subroutines within an
   expression before generating the upper levels of the expression.
   Nowadays this is never zero.  */
int do_preexpand_calls = 1;

/* Number of units that we should eventually pop off the stack.
   These are the arguments to function calls that have already returned.  */
int pending_stack_adjust;

/* Nonzero means stack pops must not be deferred, and deferred stack
   pops must not be output.  It is nonzero inside a function call,
   inside a conditional expression, inside a statement expression,
   and in other cases as well.  */
int inhibit_defer_pop;

/* A list of all cleanups which belong to the arguments of
   function calls being expanded by expand_call.  */
tree cleanups_this_call;

/* Nonzero means __builtin_saveregs has already been done in this function.
   The value is the pseudoreg containing the value __builtin_saveregs
   returned.  */
static rtx saveregs_value;

rtx store_expr ();
static void store_constructor ();
static rtx store_field ();
static rtx expand_builtin ();
static rtx compare ();
static rtx do_store_flag ();
static void preexpand_calls ();
static rtx expand_increment ();
static void init_queue ();

void do_pending_stack_adjust ();
static void do_jump_for_compare ();
static void do_jump_by_parts_equality ();
static void do_jump_by_parts_equality_rtx ();
static void do_jump_by_parts_greater ();

/* Record for each mode whether we can move a register directly to or
   from an object of that mode in memory.  If we can't, we won't try
   to use that mode directly when accessing a field of that mode.  */

static char direct_load[NUM_MACHINE_MODES];
static char direct_store[NUM_MACHINE_MODES];

/* MOVE_RATIO is the number of move instructions that is better than
   a block move.  */

#ifndef MOVE_RATIO
#if defined (HAVE_movstrqi) || defined (HAVE_movstrhi) || defined (HAVE_movstrsi) || defined (HAVE_movstrdi)
#define MOVE_RATIO 2
#else
/* A value of around 6 would minimize code size; infinity would minimize
   execution time.  */
#define MOVE_RATIO 15
#endif
#endif

/* SLOW_UNALIGNED_ACCESS is non-zero if unaligned accesses are very slow. */

#ifndef SLOW_UNALIGNED_ACCESS
#define SLOW_UNALIGNED_ACCESS 0
#endif

/* This is run once per compilation to set up which modes can be used
   directly in memory.  */

void
init_expr_once ()
{
  rtx insn, pat;
  enum machine_mode mode;
  rtx mem = gen_rtx (MEM, VOIDmode, stack_pointer_rtx);

  start_sequence ();
  insn = emit_insn (gen_rtx (SET, 0, 0));
  pat = PATTERN (insn);

  for (mode = VOIDmode; (int) mode < NUM_MACHINE_MODES;
       mode = (enum machine_mode) ((int) mode + 1))
    {
      int regno;
      rtx reg;
      int num_clobbers;

      direct_load[(int) mode] = direct_store[(int) mode] = 0;
      PUT_MODE (mem, mode);

      /* Find a register that can be used in this mode, if any.  */
      for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
	if (HARD_REGNO_MODE_OK (regno, mode))
	  break;

      if (regno == FIRST_PSEUDO_REGISTER)
	continue;

      reg = gen_rtx (REG, mode, regno);

      SET_SRC (pat) = mem;
      SET_DEST (pat) = reg;
      direct_load[(int) mode] = (recog (pat, insn, &num_clobbers)) >= 0;

      SET_SRC (pat) = reg;
      SET_DEST (pat) = mem;
      direct_store[(int) mode] = (recog (pat, insn, &num_clobbers)) >= 0;
    }

  end_sequence ();
}
      
/* This is run at the start of compiling a function.  */

void
init_expr ()
{
  init_queue ();

  pending_stack_adjust = 0;
  inhibit_defer_pop = 0;
  cleanups_this_call = 0;
  saveregs_value = 0;
  forced_labels = 0;
}

/* Save all variables describing the current status into the structure *P.
   This is used before starting a nested function.  */

void
save_expr_status (p)
     struct function *p;
{
  /* Instead of saving the postincrement queue, empty it.  */
  emit_queue ();

  p->pending_stack_adjust = pending_stack_adjust;
  p->inhibit_defer_pop = inhibit_defer_pop;
  p->cleanups_this_call = cleanups_this_call;
  p->saveregs_value = saveregs_value;
  p->forced_labels = forced_labels;

  pending_stack_adjust = 0;
  inhibit_defer_pop = 0;
  cleanups_this_call = 0;
  saveregs_value = 0;
  forced_labels = 0;
}

/* Restore all variables describing the current status from the structure *P.
   This is used after a nested function.  */

void
restore_expr_status (p)
     struct function *p;
{
  pending_stack_adjust = p->pending_stack_adjust;
  inhibit_defer_pop = p->inhibit_defer_pop;
  cleanups_this_call = p->cleanups_this_call;
  saveregs_value = p->saveregs_value;
  forced_labels = p->forced_labels;
}

/* Manage the queue of increment instructions to be output
   for POSTINCREMENT_EXPR expressions, etc.  */

static rtx pending_chain;

/* Queue up to increment (or change) VAR later.  BODY says how:
   BODY should be the same thing you would pass to emit_insn
   to increment right away.  It will go to emit_insn later on.

   The value is a QUEUED expression to be used in place of VAR
   where you want to guarantee the pre-incrementation value of VAR.  */

static rtx
enqueue_insn (var, body)
     rtx var, body;
{
  pending_chain = gen_rtx (QUEUED, GET_MODE (var),
			   var, NULL_RTX, NULL_RTX, body, pending_chain);
  return pending_chain;
}

/* Use protect_from_queue to convert a QUEUED expression
   into something that you can put immediately into an instruction.
   If the queued incrementation has not happened yet,
   protect_from_queue returns the variable itself.
   If the incrementation has happened, protect_from_queue returns a temp
   that contains a copy of the old value of the variable.

   Any time an rtx which might possibly be a QUEUED is to be put
   into an instruction, it must be passed through protect_from_queue first.
   QUEUED expressions are not meaningful in instructions.

   Do not pass a value through protect_from_queue and then hold
   on to it for a while before putting it in an instruction!
   If the queue is flushed in between, incorrect code will result.  */

rtx
protect_from_queue (x, modify)
     register rtx x;
     int modify;
{
  register RTX_CODE code = GET_CODE (x);

#if 0  /* A QUEUED can hang around after the queue is forced out.  */
  /* Shortcut for most common case.  */
  if (pending_chain == 0)
    return x;
#endif

  if (code != QUEUED)
    {
      /* A special hack for read access to (MEM (QUEUED ...))
	 to facilitate use of autoincrement.
	 Make a copy of the contents of the memory location
	 rather than a copy of the address, but not
	 if the value is of mode BLKmode.  */
      if (code == MEM && GET_MODE (x) != BLKmode
	  && GET_CODE (XEXP (x, 0)) == QUEUED && !modify)
	{
	  register rtx y = XEXP (x, 0);
	  XEXP (x, 0) = QUEUED_VAR (y);
	  if (QUEUED_INSN (y))
	    {
	      register rtx temp = gen_reg_rtx (GET_MODE (x));
	      emit_insn_before (gen_move_insn (temp, x),
				QUEUED_INSN (y));
	      return temp;
	    }
	  return x;
	}
      /* Otherwise, recursively protect the subexpressions of all
	 the kinds of rtx's that can contain a QUEUED.  */
      if (code == MEM)
	XEXP (x, 0) = protect_from_queue (XEXP (x, 0), 0);
      else if (code == PLUS || code == MULT)
	{
	  XEXP (x, 0) = protect_from_queue (XEXP (x, 0), 0);
	  XEXP (x, 1) = protect_from_queue (XEXP (x, 1), 0);
	}
      return x;
    }
  /* If the increment has not happened, use the variable itself.  */
  if (QUEUED_INSN (x) == 0)
    return QUEUED_VAR (x);
  /* If the increment has happened and a pre-increment copy exists,
     use that copy.  */
  if (QUEUED_COPY (x) != 0)
    return QUEUED_COPY (x);
  /* The increment has happened but we haven't set up a pre-increment copy.
     Set one up now, and use it.  */
  QUEUED_COPY (x) = gen_reg_rtx (GET_MODE (QUEUED_VAR (x)));
  emit_insn_before (gen_move_insn (QUEUED_COPY (x), QUEUED_VAR (x)),
		    QUEUED_INSN (x));
  return QUEUED_COPY (x);
}

/* Return nonzero if X contains a QUEUED expression:
   if it contains anything that will be altered by a queued increment.
   We handle only combinations of MEM, PLUS, MINUS and MULT operators
   since memory addresses generally contain only those.  */

static int
queued_subexp_p (x)
     rtx x;
{
  register enum rtx_code code = GET_CODE (x);
  switch (code)
    {
    case QUEUED:
      return 1;
    case MEM:
      return queued_subexp_p (XEXP (x, 0));
    case MULT:
    case PLUS:
    case MINUS:
      return queued_subexp_p (XEXP (x, 0))
	|| queued_subexp_p (XEXP (x, 1));
    }
  return 0;
}

/* Perform all the pending incrementations.  */

void
emit_queue ()
{
  register rtx p;
  while (p = pending_chain)
    {
      QUEUED_INSN (p) = emit_insn (QUEUED_BODY (p));
      pending_chain = QUEUED_NEXT (p);
    }
}

static void
init_queue ()
{
  if (pending_chain)
    abort ();
}

/* Copy data from FROM to TO, where the machine modes are not the same.
   Both modes may be integer, or both may be floating.
   UNSIGNEDP should be nonzero if FROM is an unsigned type.
   This causes zero-extension instead of sign-extension.  */

void
convert_move (to, from, unsignedp)
     register rtx to, from;
     int unsignedp;
{
  enum machine_mode to_mode = GET_MODE (to);
  enum machine_mode from_mode = GET_MODE (from);
  int to_real = GET_MODE_CLASS (to_mode) == MODE_FLOAT;
  int from_real = GET_MODE_CLASS (from_mode) == MODE_FLOAT;
  enum insn_code code;
  rtx libcall;

  /* rtx code for making an equivalent value.  */
  enum rtx_code equiv_code = (unsignedp ? ZERO_EXTEND : SIGN_EXTEND);

  to = protect_from_queue (to, 1);
  from = protect_from_queue (from, 0);

  if (to_real != from_real)
    abort ();

  if (to_mode == from_mode
      || (from_mode == VOIDmode && CONSTANT_P (from)))
    {
      emit_move_insn (to, from);
      return;
    }

  if (to_real)
    {
#ifdef HAVE_extendsfdf2
      if (HAVE_extendsfdf2 && from_mode == SFmode && to_mode == DFmode)
	{
	  emit_unop_insn (CODE_FOR_extendsfdf2, to, from, UNKNOWN);
	  return;
	}
#endif
#ifdef HAVE_extendsfxf2
      if (HAVE_extendsfxf2 && from_mode == SFmode && to_mode == XFmode)
	{
	  emit_unop_insn (CODE_FOR_extendsfxf2, to, from, UNKNOWN);
	  return;
	}
#endif
#ifdef HAVE_extendsftf2
      if (HAVE_extendsftf2 && from_mode == SFmode && to_mode == TFmode)
	{
	  emit_unop_insn (CODE_FOR_extendsftf2, to, from, UNKNOWN);
	  return;
	}
#endif
#ifdef HAVE_extenddfxf2
      if (HAVE_extenddfxf2 && from_mode == DFmode && to_mode == XFmode)
	{
	  emit_unop_insn (CODE_FOR_extenddfxf2, to, from, UNKNOWN);
	  return;
	}
#endif
#ifdef HAVE_extenddftf2
      if (HAVE_extenddftf2 && from_mode == DFmode && to_mode == TFmode)
	{
	  emit_unop_insn (CODE_FOR_extenddftf2, to, from, UNKNOWN);
	  return;
	}
#endif
#ifdef HAVE_truncdfsf2
      if (HAVE_truncdfsf2 && from_mode == DFmode && to_mode == SFmode)
	{
	  emit_unop_insn (CODE_FOR_truncdfsf2, to, from, UNKNOWN);
	  return;
	}
#endif
#ifdef HAVE_truncxfsf2
      if (HAVE_truncxfsf2 && from_mode == XFmode && to_mode == SFmode)
	{
	  emit_unop_insn (CODE_FOR_truncxfsf2, to, from, UNKNOWN);
	  return;
	}
#endif
#ifdef HAVE_trunctfsf2
      if (HAVE_trunctfsf2 && from_mode == TFmode && to_mode == SFmode)
	{
	  emit_unop_insn (CODE_FOR_trunctfsf2, to, from, UNKNOWN);
	  return;
	}
#endif
#ifdef HAVE_truncxfdf2
      if (HAVE_truncxfdf2 && from_mode == XFmode && to_mode == DFmode)
	{
	  emit_unop_insn (CODE_FOR_truncxfdf2, to, from, UNKNOWN);
	  return;
	}
#endif
#ifdef HAVE_trunctfdf2
      if (HAVE_trunctfdf2 && from_mode == TFmode && to_mode == DFmode)
	{
	  emit_unop_insn (CODE_FOR_trunctfdf2, to, from, UNKNOWN);
	  return;
	}
#endif

      libcall = (rtx) 0;
      switch (from_mode)
	{
	case SFmode:
	  switch (to_mode)
	    {
	    case DFmode:
	      libcall = extendsfdf2_libfunc;
	      break;

	    case XFmode:
	      libcall = extendsfxf2_libfunc;
	      break;

	    case TFmode:
	      libcall = extendsftf2_libfunc;
	      break;
	    }
	  break;

	case DFmode:
	  switch (to_mode)
	    {
	    case SFmode:
	      libcall = truncdfsf2_libfunc;
	      break;

	    case XFmode:
	      libcall = extenddfxf2_libfunc;
	      break;

	    case TFmode:
	      libcall = extenddftf2_libfunc;
	      break;
	    }
	  break;

	case XFmode:
	  switch (to_mode)
	    {
	    case SFmode:
	      libcall = truncxfsf2_libfunc;
	      break;

	    case DFmode:
	      libcall = truncxfdf2_libfunc;
	      break;
	    }
	  break;

	case TFmode:
	  switch (to_mode)
	    {
	    case SFmode:
	      libcall = trunctfsf2_libfunc;
	      break;

	    case DFmode:
	      libcall = trunctfdf2_libfunc;
	      break;
	    }
	  break;
	}

      if (libcall == (rtx) 0)
	/* This conversion is not implemented yet.  */
	abort ();

      emit_library_call (libcall, 1, to_mode, 1, from, from_mode);
      emit_move_insn (to, hard_libcall_value (to_mode));
      return;
    }

  /* Now both modes are integers.  */

  /* Handle expanding beyond a word.  */
  if (GET_MODE_BITSIZE (from_mode) < GET_MODE_BITSIZE (to_mode)
      && GET_MODE_BITSIZE (to_mode) > BITS_PER_WORD)
    {
      rtx insns;
      rtx lowpart;
      rtx fill_value;
      rtx lowfrom;
      int i;
      enum machine_mode lowpart_mode;
      int nwords = CEIL (GET_MODE_SIZE (to_mode), UNITS_PER_WORD);

      /* Try converting directly if the insn is supported.  */
      if ((code = can_extend_p (to_mode, from_mode, unsignedp))
	  != CODE_FOR_nothing)
	{
	  emit_unop_insn (code, to, from, equiv_code);
	  return;
	}
      /* Next, try converting via full word.  */
      else if (GET_MODE_BITSIZE (from_mode) < BITS_PER_WORD
	       && ((code = can_extend_p (to_mode, word_mode, unsignedp))
		   != CODE_FOR_nothing))
	{
	  convert_move (gen_lowpart (word_mode, to), from, unsignedp);
	  emit_unop_insn (code, to,
			  gen_lowpart (word_mode, to), equiv_code);
	  return;
	}

      /* No special multiword conversion insn; do it by hand.  */
      start_sequence ();

      /* Get a copy of FROM widened to a word, if necessary.  */
      if (GET_MODE_BITSIZE (from_mode) < BITS_PER_WORD)
	lowpart_mode = word_mode;
      else
	lowpart_mode = from_mode;

      lowfrom = convert_to_mode (lowpart_mode, from, unsignedp);

      lowpart = gen_lowpart (lowpart_mode, to);
      emit_move_insn (lowpart, lowfrom);

      /* Compute the value to put in each remaining word.  */
      if (unsignedp)
	fill_value = const0_rtx;
      else
	{
#ifdef HAVE_slt
	  if (HAVE_slt
	      && insn_operand_mode[(int) CODE_FOR_slt][0] == word_mode
	      && STORE_FLAG_VALUE == -1)
	    {
	      emit_cmp_insn (lowfrom, const0_rtx, NE, NULL_RTX,
			     lowpart_mode, 0, 0);
	      fill_value = gen_reg_rtx (word_mode);
	      emit_insn (gen_slt (fill_value));
	    }
	  else
#endif
	    {
	      fill_value
		= expand_shift (RSHIFT_EXPR, lowpart_mode, lowfrom,
				size_int (GET_MODE_BITSIZE (lowpart_mode) - 1),
				NULL_RTX, 0);
	      fill_value = convert_to_mode (word_mode, fill_value, 1);
	    }
	}

      /* Fill the remaining words.  */
      for (i = GET_MODE_SIZE (lowpart_mode) / UNITS_PER_WORD; i < nwords; i++)
	{
	  int index = (WORDS_BIG_ENDIAN ? nwords - i - 1 : i);
	  rtx subword = operand_subword (to, index, 1, to_mode);

	  if (subword == 0)
	    abort ();

	  if (fill_value != subword)
	    emit_move_insn (subword, fill_value);
	}

      insns = get_insns ();
      end_sequence ();

      emit_no_conflict_block (insns, to, from, NULL_RTX,
			      gen_rtx (equiv_code, to_mode, from));
      return;
    }

  if (GET_MODE_BITSIZE (from_mode) > BITS_PER_WORD)
    {
      convert_move (to, gen_lowpart (word_mode, from), 0);
      return;
    }

  /* Handle pointer conversion */			/* SPEE 900220 */
  if (to_mode == PSImode)
    {
      if (from_mode != SImode)
	from = convert_to_mode (SImode, from, unsignedp);

#ifdef HAVE_truncsipsi
      if (HAVE_truncsipsi)
	{
	  emit_unop_insn (CODE_FOR_truncsipsi, to, from, UNKNOWN);
	  return;
	}
#endif /* HAVE_truncsipsi */
      abort ();
    }

  if (from_mode == PSImode)
    {
      if (to_mode != SImode)
	{
	  from = convert_to_mode (SImode, from, unsignedp);
	  from_mode = SImode;
	}
      else
	{
#ifdef HAVE_extendpsisi
	  if (HAVE_extendpsisi)
	    {
	      emit_unop_insn (CODE_FOR_extendpsisi, to, from, UNKNOWN);
	      return;
	    }
#endif /* HAVE_extendpsisi */
	  abort ();
	}
    }

  /* Now follow all the conversions between integers
     no more than a word long.  */

  /* For truncation, usually we can just refer to FROM in a narrower mode.  */
  if (GET_MODE_BITSIZE (to_mode) < GET_MODE_BITSIZE (from_mode)
      && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (to_mode),
				GET_MODE_BITSIZE (from_mode))
      && ((GET_CODE (from) == MEM
	   && ! MEM_VOLATILE_P (from)
	   && direct_load[(int) to_mode]
	   && ! mode_dependent_address_p (XEXP (from, 0)))
	  || GET_CODE (from) == REG
	  || GET_CODE (from) == SUBREG))
    {
      emit_move_insn (to, gen_lowpart (to_mode, from));
      return;
    }

  /* For truncation, usually we can just refer to FROM in a narrower mode.  */
  if (GET_MODE_BITSIZE (to_mode) > GET_MODE_BITSIZE (from_mode))
    {
      /* Convert directly if that works.  */
      if ((code = can_extend_p (to_mode, from_mode, unsignedp))
	  != CODE_FOR_nothing)
	{
	  /* If FROM is a SUBREG, put it into a register.  Do this
	     so that we always generate the same set of insns for
	     better cse'ing; if an intermediate assignment occurred,
	     we won't be doing the operation directly on the SUBREG.  */
	  if (optimize > 0 && GET_CODE (from) == SUBREG)
	    from = force_reg (from_mode, from);
	  emit_unop_insn (code, to, from, equiv_code);
	  return;
	}
      else
	{
	  enum machine_mode intermediate;

	  /* Search for a mode to convert via.  */
	  for (intermediate = from_mode; intermediate != VOIDmode;
	       intermediate = GET_MODE_WIDER_MODE (intermediate))
	    if ((can_extend_p (to_mode, intermediate, unsignedp)
		 != CODE_FOR_nothing)
		&& (can_extend_p (intermediate, from_mode, unsignedp)
		    != CODE_FOR_nothing))
	      {
		convert_move (to, convert_to_mode (intermediate, from,
						   unsignedp), unsignedp);
		return;
	      }

	  /* No suitable intermediate mode.  */
	  abort ();
	}
    }

  /* Support special truncate insns for certain modes.  */ 

  if (from_mode == DImode && to_mode == SImode)
    {
#ifdef HAVE_truncdisi2
      if (HAVE_truncdisi2)
	{
	  emit_unop_insn (CODE_FOR_truncdisi2, to, from, UNKNOWN);
	  return;
	}
#endif
      convert_move (to, force_reg (from_mode, from), unsignedp);
      return;
    }

  if (from_mode == DImode && to_mode == HImode)
    {
#ifdef HAVE_truncdihi2
      if (HAVE_truncdihi2)
	{
	  emit_unop_insn (CODE_FOR_truncdihi2, to, from, UNKNOWN);
	  return;
	}
#endif
      convert_move (to, force_reg (from_mode, from), unsignedp);
      return;
    }

  if (from_mode == DImode && to_mode == QImode)
    {
#ifdef HAVE_truncdiqi2
      if (HAVE_truncdiqi2)
	{
	  emit_unop_insn (CODE_FOR_truncdiqi2, to, from, UNKNOWN);
	  return;
	}
#endif
      convert_move (to, force_reg (from_mode, from), unsignedp);
      return;
    }

  if (from_mode == SImode && to_mode == HImode)
    {
#ifdef HAVE_truncsihi2
      if (HAVE_truncsihi2)
	{
	  emit_unop_insn (CODE_FOR_truncsihi2, to, from, UNKNOWN);
	  return;
	}
#endif
      convert_move (to, force_reg (from_mode, from), unsignedp);
      return;
    }

  if (from_mode == SImode && to_mode == QImode)
    {
#ifdef HAVE_truncsiqi2
      if (HAVE_truncsiqi2)
	{
	  emit_unop_insn (CODE_FOR_truncsiqi2, to, from, UNKNOWN);
	  return;
	}
#endif
      convert_move (to, force_reg (from_mode, from), unsignedp);
      return;
    }

  if (from_mode == HImode && to_mode == QImode)
    {
#ifdef HAVE_trunchiqi2
      if (HAVE_trunchiqi2)
	{
	  emit_unop_insn (CODE_FOR_trunchiqi2, to, from, UNKNOWN);
	  return;
	}
#endif
      convert_move (to, force_reg (from_mode, from), unsignedp);
      return;
    }

  /* Handle truncation of volatile memrefs, and so on;
     the things that couldn't be truncated directly,
     and for which there was no special instruction.  */
  if (GET_MODE_BITSIZE (to_mode) < GET_MODE_BITSIZE (from_mode))
    {
      rtx temp = force_reg (to_mode, gen_lowpart (to_mode, from));
      emit_move_insn (to, temp);
      return;
    }

  /* Mode combination is not recognized.  */
  abort ();
}

/* Return an rtx for a value that would result
   from converting X to mode MODE.
   Both X and MODE may be floating, or both integer.
   UNSIGNEDP is nonzero if X is an unsigned value.
   This can be done by referring to a part of X in place
   or by copying to a new temporary with conversion.

   This function *must not* call protect_from_queue
   except when putting X into an insn (in which case convert_move does it).  */

rtx
convert_to_mode (mode, x, unsignedp)
     enum machine_mode mode;
     rtx x;
     int unsignedp;
{
  register rtx temp;

  if (mode == GET_MODE (x))
    return x;

  /* There is one case that we must handle specially: If we are converting
     a CONST_INT into a mode whose size is twice HOST_BITS_PER_WIDE_INT and
     we are to interpret the constant as unsigned, gen_lowpart will do
     the wrong if the constant appears negative.  What we want to do is
     make the high-order word of the constant zero, not all ones.  */

  if (unsignedp && GET_MODE_CLASS (mode) == MODE_INT
      && GET_MODE_BITSIZE (mode) == 2 * HOST_BITS_PER_WIDE_INT
      && GET_CODE (x) == CONST_INT && INTVAL (x) < 0)
    return immed_double_const (INTVAL (x), (HOST_WIDE_INT) 0, mode);

  /* We can do this with a gen_lowpart if both desired and current modes
     are integer, and this is either a constant integer, a register, or a
     non-volatile MEM.  Except for the constant case, we must be narrowing
     the operand.  */

  if (GET_CODE (x) == CONST_INT
      || (GET_MODE_CLASS (mode) == MODE_INT
	  && GET_MODE_CLASS (GET_MODE (x)) == MODE_INT
	  && (GET_CODE (x) == CONST_DOUBLE
	      || (GET_MODE_SIZE (mode) <= GET_MODE_SIZE (GET_MODE (x))
		  && ((GET_CODE (x) == MEM && ! MEM_VOLATILE_P (x))
		      && direct_load[(int) mode]
		      || GET_CODE (x) == REG)))))
    return gen_lowpart (mode, x);

  temp = gen_reg_rtx (mode);
  convert_move (temp, x, unsignedp);
  return temp;
}

/* Generate several move instructions to copy LEN bytes
   from block FROM to block TO.  (These are MEM rtx's with BLKmode).
   The caller must pass FROM and TO
    through protect_from_queue before calling.
   ALIGN (in bytes) is maximum alignment we can assume.  */

struct move_by_pieces
{
  rtx to;
  rtx to_addr;
  int autinc_to;
  int explicit_inc_to;
  rtx from;
  rtx from_addr;
  int autinc_from;
  int explicit_inc_from;
  int len;
  int offset;
  int reverse;
};

static void move_by_pieces_1 ();
static int move_by_pieces_ninsns ();

static void
move_by_pieces (to, from, len, align)
     rtx to, from;
     int len, align;
{
  struct move_by_pieces data;
  rtx to_addr = XEXP (to, 0), from_addr = XEXP (from, 0);
  int max_size = MOVE_MAX + 1;

  data.offset = 0;
  data.to_addr = to_addr;
  data.from_addr = from_addr;
  data.to = to;
  data.from = from;
  data.autinc_to
    = (GET_CODE (to_addr) == PRE_INC || GET_CODE (to_addr) == PRE_DEC
       || GET_CODE (to_addr) == POST_INC || GET_CODE (to_addr) == POST_DEC);
  data.autinc_from
    = (GET_CODE (from_addr) == PRE_INC || GET_CODE (from_addr) == PRE_DEC
       || GET_CODE (from_addr) == POST_INC
       || GET_CODE (from_addr) == POST_DEC);

  data.explicit_inc_from = 0;
  data.explicit_inc_to = 0;
  data.reverse
    = (GET_CODE (to_addr) == PRE_DEC || GET_CODE (to_addr) == POST_DEC);
  if (data.reverse) data.offset = len;
  data.len = len;

  /* If copying requires more than two move insns,
     copy addresses to registers (to make displacements shorter)
     and use post-increment if available.  */
  if (!(data.autinc_from && data.autinc_to)
      && move_by_pieces_ninsns (len, align) > 2)
    {
#ifdef HAVE_PRE_DECREMENT
      if (data.reverse && ! data.autinc_from)
	{
	  data.from_addr = copy_addr_to_reg (plus_constant (from_addr, len));
	  data.autinc_from = 1;
	  data.explicit_inc_from = -1;
	}
#endif
#ifdef HAVE_POST_INCREMENT
      if (! data.autinc_from)
	{
	  data.from_addr = copy_addr_to_reg (from_addr);
	  data.autinc_from = 1;
	  data.explicit_inc_from = 1;
	}
#endif
      if (!data.autinc_from && CONSTANT_P (from_addr))
	data.from_addr = copy_addr_to_reg (from_addr);
#ifdef HAVE_PRE_DECREMENT
      if (data.reverse && ! data.autinc_to)
	{
	  data.to_addr = copy_addr_to_reg (plus_constant (to_addr, len));
	  data.autinc_to = 1;
	  data.explicit_inc_to = -1;
	}
#endif
#ifdef HAVE_POST_INCREMENT
      if (! data.reverse && ! data.autinc_to)
	{
	  data.to_addr = copy_addr_to_reg (to_addr);
	  data.autinc_to = 1;
	  data.explicit_inc_to = 1;
	}
#endif
      if (!data.autinc_to && CONSTANT_P (to_addr))
	data.to_addr = copy_addr_to_reg (to_addr);
    }

  if (! (STRICT_ALIGNMENT || SLOW_UNALIGNED_ACCESS)
      || align > MOVE_MAX || align >= BIGGEST_ALIGNMENT / BITS_PER_UNIT)
    align = MOVE_MAX;

  /* First move what we can in the largest integer mode, then go to
     successively smaller modes.  */

  while (max_size > 1)
    {
      enum machine_mode mode = VOIDmode, tmode;
      enum insn_code icode;

      for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
	   tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
	if (GET_MODE_SIZE (tmode) < max_size)
	  mode = tmode;

      if (mode == VOIDmode)
	break;

      icode = mov_optab->handlers[(int) mode].insn_code;
      if (icode != CODE_FOR_nothing
	  && align >= MIN (BIGGEST_ALIGNMENT / BITS_PER_UNIT,
			   GET_MODE_SIZE (mode)))
	move_by_pieces_1 (GEN_FCN (icode), mode, &data);

      max_size = GET_MODE_SIZE (mode);
    }

  /* The code above should have handled everything.  */
  if (data.len != 0)
    abort ();
}

/* Return number of insns required to move L bytes by pieces.
   ALIGN (in bytes) is maximum alignment we can assume.  */

static int
move_by_pieces_ninsns (l, align)
     unsigned int l;
     int align;
{
  register int n_insns = 0;
  int max_size = MOVE_MAX + 1;

  if (! (STRICT_ALIGNMENT || SLOW_UNALIGNED_ACCESS)
      || align > MOVE_MAX || align >= BIGGEST_ALIGNMENT / BITS_PER_UNIT)
    align = MOVE_MAX;

  while (max_size > 1)
    {
      enum machine_mode mode = VOIDmode, tmode;
      enum insn_code icode;

      for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
	   tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
	if (GET_MODE_SIZE (tmode) < max_size)
	  mode = tmode;

      if (mode == VOIDmode)
	break;

      icode = mov_optab->handlers[(int) mode].insn_code;
      if (icode != CODE_FOR_nothing
	  && align >= MIN (BIGGEST_ALIGNMENT / BITS_PER_UNIT,
			   GET_MODE_SIZE (mode)))
	n_insns += l / GET_MODE_SIZE (mode), l %= GET_MODE_SIZE (mode);

      max_size = GET_MODE_SIZE (mode);
    }

  return n_insns;
}

/* Subroutine of move_by_pieces.  Move as many bytes as appropriate
   with move instructions for mode MODE.  GENFUN is the gen_... function
   to make a move insn for that mode.  DATA has all the other info.  */

static void
move_by_pieces_1 (genfun, mode, data)
     rtx (*genfun) ();
     enum machine_mode mode;
     struct move_by_pieces *data;
{
  register int size = GET_MODE_SIZE (mode);
  register rtx to1, from1;

  while (data->len >= size)
    {
      if (data->reverse) data->offset -= size;

      to1 = (data->autinc_to
	     ? gen_rtx (MEM, mode, data->to_addr)
	     : change_address (data->to, mode,
			       plus_constant (data->to_addr, data->offset)));
      from1 =
	(data->autinc_from
	 ? gen_rtx (MEM, mode, data->from_addr)
	 : change_address (data->from, mode,
			   plus_constant (data->from_addr, data->offset)));

#ifdef HAVE_PRE_DECREMENT
      if (data->explicit_inc_to < 0)
	emit_insn (gen_add2_insn (data->to_addr, GEN_INT (-size)));
      if (data->explicit_inc_from < 0)
	emit_insn (gen_add2_insn (data->from_addr, GEN_INT (-size)));
#endif

      emit_insn ((*genfun) (to1, from1));
#ifdef HAVE_POST_INCREMENT
      if (data->explicit_inc_to > 0)
	emit_insn (gen_add2_insn (data->to_addr, GEN_INT (size)));
      if (data->explicit_inc_from > 0)
	emit_insn (gen_add2_insn (data->from_addr, GEN_INT (size)));
#endif

      if (! data->reverse) data->offset += size;

      data->len -= size;
    }
}

/* Emit code to move a block Y to a block X.
   This may be done with string-move instructions,
   with multiple scalar move instructions, or with a library call.

   Both X and Y must be MEM rtx's (perhaps inside VOLATILE)
   with mode BLKmode.
   SIZE is an rtx that says how long they are.
   ALIGN is the maximum alignment we can assume they have,
   measured in bytes.  */

void
emit_block_move (x, y, size, align)
     rtx x, y;
     rtx size;
     int align;
{
  if (GET_MODE (x) != BLKmode)
    abort ();

  if (GET_MODE (y) != BLKmode)
    abort ();

  x = protect_from_queue (x, 1);
  y = protect_from_queue (y, 0);
  size = protect_from_queue (size, 0);

  if (GET_CODE (x) != MEM)
    abort ();
  if (GET_CODE (y) != MEM)
    abort ();
  if (size == 0)
    abort ();

  if (GET_CODE (size) == CONST_INT
      && (move_by_pieces_ninsns (INTVAL (size), align) < MOVE_RATIO))
    move_by_pieces (x, y, INTVAL (size), align);
  else
    {
      /* Try the most limited insn first, because there's no point
	 including more than one in the machine description unless
	 the more limited one has some advantage.  */
#ifdef HAVE_movstrqi
      if (HAVE_movstrqi
	  && GET_CODE (size) == CONST_INT
	  && ((unsigned) INTVAL (size)
	      < (1 << (GET_MODE_BITSIZE (QImode) - 1))))
	{
	  rtx insn = gen_movstrqi (x, y, size, GEN_INT (align));
	  if (insn)
	    {
	      emit_insn (insn);
	      return;
	    }
	}
#endif
#ifdef HAVE_movstrhi
      if (HAVE_movstrhi
	  && GET_CODE (size) == CONST_INT
	  && ((unsigned) INTVAL (size)
	      < (1 << (GET_MODE_BITSIZE (HImode) - 1))))
	{
	  rtx insn = gen_movstrhi (x, y, size, GEN_INT (align));
	  if (insn)
	    {
	      emit_insn (insn);
	      return;
	    }
	}
#endif
#ifdef HAVE_movstrsi
      if (HAVE_movstrsi)
	{
	  rtx insn = gen_movstrsi (x, y, size, GEN_INT (align));
	  if (insn)
	    {
	      emit_insn (insn);
	      return;
	    }
	}
#endif
#ifdef HAVE_movstrdi
      if (HAVE_movstrdi)
	{
	  rtx insn = gen_movstrdi (x, y, size, GEN_INT (align));
	  if (insn)
	    {
	      emit_insn (insn);
	      return;
	    }
	}
#endif

#ifdef TARGET_MEM_FUNCTIONS
      emit_library_call (memcpy_libfunc, 1,
			 VOIDmode, 3, XEXP (x, 0), Pmode,
			 XEXP (y, 0), Pmode,
			 convert_to_mode (Pmode, size, 1), Pmode);
#else
      emit_library_call (bcopy_libfunc, 1,
			 VOIDmode, 3, XEXP (y, 0), Pmode,
			 XEXP (x, 0), Pmode,
			 convert_to_mode (Pmode, size, 1), Pmode);
#endif
    }
}

/* Copy all or part of a value X into registers starting at REGNO.
   The number of registers to be filled is NREGS.  */

void
move_block_to_reg (regno, x, nregs, mode)
     int regno;
     rtx x;
     int nregs;
     enum machine_mode mode;
{
  int i;
  rtx pat, last;

  if (CONSTANT_P (x) && ! LEGITIMATE_CONSTANT_P (x))
    x = validize_mem (force_const_mem (mode, x));

  /* See if the machine can do this with a load multiple insn.  */
#ifdef HAVE_load_multiple
  last = get_last_insn ();
  pat = gen_load_multiple (gen_rtx (REG, word_mode, regno), x,
			   GEN_INT (nregs));
  if (pat)
    {
      emit_insn (pat);
      return;
    }
  else
    delete_insns_since (last);
#endif

  for (i = 0; i < nregs; i++)
    emit_move_insn (gen_rtx (REG, word_mode, regno + i),
		    operand_subword_force (x, i, mode));
}

/* Copy all or part of a BLKmode value X out of registers starting at REGNO.
   The number of registers to be filled is NREGS.  */

void
move_block_from_reg (regno, x, nregs)
     int regno;
     rtx x;
     int nregs;
{
  int i;
  rtx pat, last;

  /* See if the machine can do this with a store multiple insn.  */
#ifdef HAVE_store_multiple
  last = get_last_insn ();
  pat = gen_store_multiple (x, gen_rtx (REG, word_mode, regno),
			    GEN_INT (nregs));
  if (pat)
    {
      emit_insn (pat);
      return;
    }
  else
    delete_insns_since (last);
#endif

  for (i = 0; i < nregs; i++)
    {
      rtx tem = operand_subword (x, i, 1, BLKmode);

      if (tem == 0)
	abort ();

      emit_move_insn (tem, gen_rtx (REG, word_mode, regno + i));
    }
}

/* Mark NREGS consecutive regs, starting at REGNO, as being live now.  */

void
use_regs (regno, nregs)
     int regno;
     int nregs;
{
  int i;

  for (i = 0; i < nregs; i++)
    emit_insn (gen_rtx (USE, VOIDmode, gen_rtx (REG, word_mode, regno + i)));
}

/* Write zeros through the storage of OBJECT.
   If OBJECT has BLKmode, SIZE is its length in bytes.  */

void
clear_storage (object, size)
     rtx object;
     int size;
{
  if (GET_MODE (object) == BLKmode)
    {
#ifdef TARGET_MEM_FUNCTIONS
      emit_library_call (memset_libfunc, 1,
			 VOIDmode, 3,
			 XEXP (object, 0), Pmode, const0_rtx, Pmode,
			 GEN_INT (size), Pmode);
#else
      emit_library_call (bzero_libfunc, 1,
			 VOIDmode, 2,
			 XEXP (object, 0), Pmode,
			 GEN_INT (size), Pmode);
#endif
    }
  else
    emit_move_insn (object, const0_rtx);
}

/* Generate code to copy Y into X.
   Both Y and X must have the same mode, except that
   Y can be a constant with VOIDmode.
   This mode cannot be BLKmode; use emit_block_move for that.

   Return the last instruction emitted.  */

rtx
emit_move_insn (x, y)
     rtx x, y;
{
  enum machine_mode mode = GET_MODE (x);
  int i;

  x = protect_from_queue (x, 1);
  y = protect_from_queue (y, 0);

  if (mode == BLKmode || (GET_MODE (y) != mode && GET_MODE (y) != VOIDmode))
    abort ();

  if (CONSTANT_P (y) && ! LEGITIMATE_CONSTANT_P (y))
    y = force_const_mem (mode, y);

  /* If X or Y are memory references, verify that their addresses are valid
     for the machine.  */
  if (GET_CODE (x) == MEM
      && ((! memory_address_p (GET_MODE (x), XEXP (x, 0))
	   && ! push_operand (x, GET_MODE (x)))
	  || (flag_force_addr
	      && CONSTANT_ADDRESS_P (XEXP (x, 0)))))
    x = change_address (x, VOIDmode, XEXP (x, 0));

  if (GET_CODE (y) == MEM
      && (! memory_address_p (GET_MODE (y), XEXP (y, 0))
	  || (flag_force_addr
	      && CONSTANT_ADDRESS_P (XEXP (y, 0)))))
    y = change_address (y, VOIDmode, XEXP (y, 0));

  if (mode == BLKmode)
    abort ();

  if (mov_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing)
    return
      emit_insn (GEN_FCN (mov_optab->handlers[(int) mode].insn_code) (x, y));

  /* This will handle any multi-word mode that lacks a move_insn pattern.
     However, you will get better code if you define such patterns,
     even if they must turn into multiple assembler instructions.  */
  else if (GET_MODE_SIZE (mode) > UNITS_PER_WORD)
    {
      rtx last_insn = 0;

      for (i = 0;
	   i < (GET_MODE_SIZE (mode)  + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD;
	   i++)
	{
	  rtx xpart = operand_subword (x, i, 1, mode);
	  rtx ypart = operand_subword (y, i, 1, mode);

	  /* If we can't get a part of Y, put Y into memory if it is a
	     constant.  Otherwise, force it into a register.  If we still
	     can't get a part of Y, abort.  */
	  if (ypart == 0 && CONSTANT_P (y))
	    {
	      y = force_const_mem (mode, y);
	      ypart = operand_subword (y, i, 1, mode);
	    }
	  else if (ypart == 0)
	    ypart = operand_subword_force (y, i, mode);

	  if (xpart == 0 || ypart == 0)
	    abort ();

	  last_insn = emit_move_insn (xpart, ypart);
	}
      return last_insn;
    }
  else
    abort ();
}

/* Pushing data onto the stack.  */

/* Push a block of length SIZE (perhaps variable)
   and return an rtx to address the beginning of the block.
   Note that it is not possible for the value returned to be a QUEUED.
   The value may be virtual_outgoing_args_rtx.

   EXTRA is the number of bytes of padding to push in addition to SIZE.
   BELOW nonzero means this padding comes at low addresses;
   otherwise, the padding comes at high addresses.  */

rtx
push_block (size, extra, below)
     rtx size;
     int extra, below;
{
  register rtx temp;
  if (CONSTANT_P (size))
    anti_adjust_stack (plus_constant (size, extra));
  else if (GET_CODE (size) == REG && extra == 0)
    anti_adjust_stack (size);
  else
    {
      rtx temp = copy_to_mode_reg (Pmode, size);
      if (extra != 0)
	temp = expand_binop (Pmode, add_optab, temp, GEN_INT (extra),
			     temp, 0, OPTAB_LIB_WIDEN);
      anti_adjust_stack (temp);
    }

#ifdef STACK_GROWS_DOWNWARD
  temp = virtual_outgoing_args_rtx;
  if (extra != 0 && below)
    temp = plus_constant (temp, extra);
#else
  if (GET_CODE (size) == CONST_INT)
    temp = plus_constant (virtual_outgoing_args_rtx,
			  - INTVAL (size) - (below ? 0 : extra));
  else if (extra != 0 && !below)
    temp = gen_rtx (PLUS, Pmode, virtual_outgoing_args_rtx,
		    negate_rtx (Pmode, plus_constant (size, extra)));
  else
    temp = gen_rtx (PLUS, Pmode, virtual_outgoing_args_rtx,
		    negate_rtx (Pmode, size));
#endif

  return memory_address (GET_CLASS_NARROWEST_MODE (MODE_INT), temp);
}

static rtx
gen_push_operand ()
{
  return gen_rtx (STACK_PUSH_CODE, Pmode, stack_pointer_rtx);
}

/* Generate code to push X onto the stack, assuming it has mode MODE and
   type TYPE.
   MODE is redundant except when X is a CONST_INT (since they don't
   carry mode info).
   SIZE is an rtx for the size of data to be copied (in bytes),
   needed only if X is BLKmode.

   ALIGN (in bytes) is maximum alignment we can assume.

   If PARTIAL is nonzero, then copy that many of the first words
   of X into registers starting with REG, and push the rest of X.
   The amount of space pushed is decreased by PARTIAL words,
   rounded *down* to a multiple of PARM_BOUNDARY.
   REG must be a hard register in this case.

   EXTRA is the amount in bytes of extra space to leave next to this arg.
   This is ignored if an argument block has already been allocated.

   On a machine that lacks real push insns, ARGS_ADDR is the address of
   the bottom of the argument block for this call.  We use indexing off there
   to store the arg.  On machines with push insns, ARGS_ADDR is 0 when a
   argument block has not been preallocated.

   ARGS_SO_FAR is the size of args previously pushed for this call.  */

void
emit_push_insn (x, mode, type, size, align, partial, reg, extra,
		args_addr, args_so_far)
     register rtx x;
     enum machine_mode mode;
     tree type;
     rtx size;
     int align;
     int partial;
     rtx reg;
     int extra;
     rtx args_addr;
     rtx args_so_far;
{
  rtx xinner;
  enum direction stack_direction
#ifdef STACK_GROWS_DOWNWARD
    = downward;
#else
    = upward;
#endif

  /* Decide where to pad the argument: `downward' for below,
     `upward' for above, or `none' for don't pad it.
     Default is below for small data on big-endian machines; else above.  */
  enum direction where_pad = FUNCTION_ARG_PADDING (mode, type);

  /* Invert direction if stack is post-update.  */
  if (STACK_PUSH_CODE == POST_INC || STACK_PUSH_CODE == POST_DEC)
    if (where_pad != none)
      where_pad = (where_pad == downward ? upward : downward);

  xinner = x = protect_from_queue (x, 0);

  if (mode == BLKmode)
    {
      /* Copy a block into the stack, entirely or partially.  */

      register rtx temp;
      int used = partial * UNITS_PER_WORD;
      int offset = used % (PARM_BOUNDARY / BITS_PER_UNIT);
      int skip;
      
      if (size == 0)
	abort ();

      used -= offset;

      /* USED is now the # of bytes we need not copy to the stack
	 because registers will take care of them.  */

      if (partial != 0)
	xinner = change_address (xinner, BLKmode,
				 plus_constant (XEXP (xinner, 0), used));

      /* If the partial register-part of the arg counts in its stack size,
	 skip the part of stack space corresponding to the registers.
	 Otherwise, start copying to the beginning of the stack space,
	 by setting SKIP to 0.  */
#ifndef REG_PARM_STACK_SPACE
      skip = 0;
#else
      skip = used;
#endif

#ifdef PUSH_ROUNDING
      /* Do it with several push insns if that doesn't take lots of insns
	 and if there is no difficulty with push insns that skip bytes
	 on the stack for alignment purposes.  */
      if (args_addr == 0
	  && GET_CODE (size) == CONST_INT
	  && skip == 0
	  && (move_by_pieces_ninsns ((unsigned) INTVAL (size) - used, align)
	      < MOVE_RATIO)
	  /* Here we avoid the case of a structure whose weak alignment
	     forces many pushes of a small amount of data,
	     and such small pushes do rounding that causes trouble.  */
	  && ((! STRICT_ALIGNMENT && ! SLOW_UNALIGNED_ACCESS)
	      || align >= BIGGEST_ALIGNMENT / BITS_PER_UNIT
	      || PUSH_ROUNDING (align) == align)
	  && PUSH_ROUNDING (INTVAL (size)) == INTVAL (size))
	{
	  /* Push padding now if padding above and stack grows down,
	     or if padding below and stack grows up.
	     But if space already allocated, this has already been done.  */
	  if (extra && args_addr == 0
	      && where_pad != none && where_pad != stack_direction)
	    anti_adjust_stack (GEN_INT (extra));

	  move_by_pieces (gen_rtx (MEM, BLKmode, gen_push_operand ()), xinner,
			  INTVAL (size) - used, align);
	}
      else
#endif /* PUSH_ROUNDING */
	{
	  /* Otherwise make space on the stack and copy the data
	     to the address of that space.  */

	  /* Deduct words put into registers from the size we must copy.  */
	  if (partial != 0)
	    {
	      if (GET_CODE (size) == CONST_INT)
		size = GEN_INT (INTVAL (size) - used);
	      else
		size = expand_binop (GET_MODE (size), sub_optab, size,
				     GEN_INT (used), NULL_RTX, 0,
				     OPTAB_LIB_WIDEN);
	    }

	  /* Get the address of the stack space.
	     In this case, we do not deal with EXTRA separately.
	     A single stack adjust will do.  */
	  if (! args_addr)
	    {
	      temp = push_block (size, extra, where_pad == downward);
	      extra = 0;
	    }
	  else if (GET_CODE (args_so_far) == CONST_INT)
	    temp = memory_address (BLKmode,
				   plus_constant (args_addr,
						  skip + INTVAL (args_so_far)));
	  else
	    temp = memory_address (BLKmode,
				   plus_constant (gen_rtx (PLUS, Pmode,
							   args_addr, args_so_far),
						  skip));

	  /* TEMP is the address of the block.  Copy the data there.  */
	  if (GET_CODE (size) == CONST_INT
	      && (move_by_pieces_ninsns ((unsigned) INTVAL (size), align)
		  < MOVE_RATIO))
	    {
	      move_by_pieces (gen_rtx (MEM, BLKmode, temp), xinner,
			      INTVAL (size), align);
	      goto ret;
	    }
	  /* Try the most limited insn first, because there's no point
	     including more than one in the machine description unless
	     the more limited one has some advantage.  */
#ifdef HAVE_movstrqi
	  if (HAVE_movstrqi
	      && GET_CODE (size) == CONST_INT
	      && ((unsigned) INTVAL (size)
		  < (1 << (GET_MODE_BITSIZE (QImode) - 1))))
	    {
	      emit_insn (gen_movstrqi (gen_rtx (MEM, BLKmode, temp),
				       xinner, size, GEN_INT (align)));
	      goto ret;
	    }
#endif
#ifdef HAVE_movstrhi
	  if (HAVE_movstrhi
	      && GET_CODE (size) == CONST_INT
	      && ((unsigned) INTVAL (size)
		  < (1 << (GET_MODE_BITSIZE (HImode) - 1))))
	    {
	      emit_insn (gen_movstrhi (gen_rtx (MEM, BLKmode, temp),
				       xinner, size, GEN_INT (align)));
	      goto ret;
	    }
#endif
#ifdef HAVE_movstrsi
	  if (HAVE_movstrsi)
	    {
	      emit_insn (gen_movstrsi (gen_rtx (MEM, BLKmode, temp),
				       xinner, size, GEN_INT (align)));
	      goto ret;
	    }
#endif
#ifdef HAVE_movstrdi
	  if (HAVE_movstrdi)
	    {
	      emit_insn (gen_movstrdi (gen_rtx (MEM, BLKmode, temp),
				       xinner, size, GEN_INT (align)));
	      goto ret;
	    }
#endif

#ifndef ACCUMULATE_OUTGOING_ARGS
	  /* If the source is referenced relative to the stack pointer,
	     copy it to another register to stabilize it.  We do not need
	     to do this if we know that we won't be changing sp.  */

	  if (reg_mentioned_p (virtual_stack_dynamic_rtx, temp)
	      || reg_mentioned_p (virtual_outgoing_args_rtx, temp))
	    temp = copy_to_reg (temp);
#endif

	  /* Make inhibit_defer_pop nonzero around the library call
	     to force it to pop the bcopy-arguments right away.  */
	  NO_DEFER_POP;
#ifdef TARGET_MEM_FUNCTIONS
	  emit_library_call (memcpy_libfunc, 1,
			     VOIDmode, 3, temp, Pmode, XEXP (xinner, 0), Pmode,
			     size, Pmode);
#else
	  emit_library_call (bcopy_libfunc, 1,
			     VOIDmode, 3, XEXP (xinner, 0), Pmode, temp, Pmode,
			     size, Pmode);
#endif
	  OK_DEFER_POP;
	}
    }
  else if (partial > 0)
    {
      /* Scalar partly in registers.  */

      int size = GET_MODE_SIZE (mode) / UNITS_PER_WORD;
      int i;
      int not_stack;
      /* # words of start of argument
	 that we must make space for but need not store.  */
      int offset = partial % (PARM_BOUNDARY / BITS_PER_WORD);
      int args_offset = INTVAL (args_so_far);
      int skip;

      /* Push padding now if padding above and stack grows down,
	 or if padding below and stack grows up.
	 But if space already allocated, this has already been done.  */
      if (extra && args_addr == 0
	  && where_pad != none && where_pad != stack_direction)
	anti_adjust_stack (GEN_INT (extra));

      /* If we make space by pushing it, we might as well push
	 the real data.  Otherwise, we can leave OFFSET nonzero
	 and leave the space uninitialized.  */
      if (args_addr == 0)
	offset = 0;

      /* Now NOT_STACK gets the number of words that we don't need to
	 allocate on the stack.  */
      not_stack = partial - offset;

      /* If the partial register-part of the arg counts in its stack size,
	 skip the part of stack space corresponding to the registers.
	 Otherwise, start copying to the beginning of the stack space,
	 by setting SKIP to 0.  */
#ifndef REG_PARM_STACK_SPACE
      skip = 0;
#else
      skip = not_stack;
#endif

      if (CONSTANT_P (x) && ! LEGITIMATE_CONSTANT_P (x))
	x = validize_mem (force_const_mem (mode, x));

      /* If X is a hard register in a non-integer mode, copy it into a pseudo;
	 SUBREGs of such registers are not allowed.  */
      if ((GET_CODE (x) == REG && REGNO (x) < FIRST_PSEUDO_REGISTER
	   && GET_MODE_CLASS (GET_MODE (x)) != MODE_INT))
	x = copy_to_reg (x);

      /* Loop over all the words allocated on the stack for this arg.  */
      /* We can do it by words, because any scalar bigger than a word
	 has a size a multiple of a word.  */
#ifndef PUSH_ARGS_REVERSED
      for (i = not_stack; i < size; i++)
#else
      for (i = size - 1; i >= not_stack; i--)
#endif
	if (i >= not_stack + offset)
	  emit_push_insn (operand_subword_force (x, i, mode),
			  word_mode, NULL_TREE, NULL_RTX, align, 0, NULL_RTX,
			  0, args_addr,
			  GEN_INT (args_offset + ((i - not_stack + skip)
						  * UNITS_PER_WORD)));
    }
  else
    {
      rtx addr;

      /* Push padding now if padding above and stack grows down,
	 or if padding below and stack grows up.
	 But if space already allocated, this has already been done.  */
      if (extra && args_addr == 0
	  && where_pad != none && where_pad != stack_direction)
	anti_adjust_stack (GEN_INT (extra));

#ifdef PUSH_ROUNDING
      if (args_addr == 0)
	addr = gen_push_operand ();
      else
#endif
	if (GET_CODE (args_so_far) == CONST_INT)
	  addr
	    = memory_address (mode,
			      plus_constant (args_addr, INTVAL (args_so_far)));
      else
	addr = memory_address (mode, gen_rtx (PLUS, Pmode, args_addr,
					      args_so_far));

      emit_move_insn (gen_rtx (MEM, mode, addr), x);
    }

 ret:
  /* If part should go in registers, copy that part
     into the appropriate registers.  Do this now, at the end,
     since mem-to-mem copies above may do function calls.  */
  if (partial > 0)
    move_block_to_reg (REGNO (reg), x, partial, mode);

  if (extra && args_addr == 0 && where_pad == stack_direction)
    anti_adjust_stack (GEN_INT (extra));
}

/* Output a library call to function FUN (a SYMBOL_REF rtx)
   (emitting the queue unless NO_QUEUE is nonzero),
   for a value of mode OUTMODE,
   with NARGS different arguments, passed as alternating rtx values
   and machine_modes to convert them to.
   The rtx values should have been passed through protect_from_queue already.

   NO_QUEUE will be true if and only if the library call is a `const' call
   which will be enclosed in REG_LIBCALL/REG_RETVAL notes; it is equivalent
   to the variable is_const in expand_call.  */

void
emit_library_call (va_alist)
     va_dcl
{
  va_list p;
  struct args_size args_size;
  register int argnum;
  enum machine_mode outmode;
  int nargs;
  rtx fun;
  rtx orgfun;
  int inc;
  int count;
  rtx argblock = 0;
  CUMULATIVE_ARGS args_so_far;
  struct arg { rtx value; enum machine_mode mode; rtx reg; int partial;
	       struct args_size offset; struct args_size size; };
  struct arg *argvec;
  int old_inhibit_defer_pop = inhibit_defer_pop;
  int no_queue = 0;
  rtx use_insns;

  va_start (p);
  orgfun = fun = va_arg (p, rtx);
  no_queue = va_arg (p, int);
  outmode = va_arg (p, enum machine_mode);
  nargs = va_arg (p, int);

  /* Copy all the libcall-arguments out of the varargs data
     and into a vector ARGVEC.

     Compute how to pass each argument.  We only support a very small subset
     of the full argument passing conventions to limit complexity here since
     library functions shouldn't have many args.  */

  argvec = (struct arg *) alloca (nargs * sizeof (struct arg));

  INIT_CUMULATIVE_ARGS (args_so_far, (tree)0, fun);

  args_size.constant = 0;
  args_size.var = 0;

  for (count = 0; count < nargs; count++)
    {
      rtx val = va_arg (p, rtx);
      enum machine_mode mode = va_arg (p, enum machine_mode);

      /* We cannot convert the arg value to the mode the library wants here;
	 must do it earlier where we know the signedness of the arg.  */
      if (mode == BLKmode
	  || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode))
	abort ();

      /* On some machines, there's no way to pass a float to a library fcn.
	 Pass it as a double instead.  */
#ifdef LIBGCC_NEEDS_DOUBLE
      if (LIBGCC_NEEDS_DOUBLE && mode == SFmode)
	val = convert_to_mode (DFmode, val), mode = DFmode;
#endif

      /* There's no need to call protect_from_queue, because
	 either emit_move_insn or emit_push_insn will do that.  */

      /* Make sure it is a reasonable operand for a move or push insn.  */
      if (GET_CODE (val) != REG && GET_CODE (val) != MEM
	  && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val)))
	val = force_operand (val, NULL_RTX);

      argvec[count].value = val;
      argvec[count].mode = mode;

#ifdef FUNCTION_ARG_PASS_BY_REFERENCE
      if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1))
	abort ();
#endif

      argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1);
      if (argvec[count].reg && GET_CODE (argvec[count].reg) == EXPR_LIST)
	abort ();
#ifdef FUNCTION_ARG_PARTIAL_NREGS
      argvec[count].partial
	= FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1);
#else
      argvec[count].partial = 0;
#endif

      locate_and_pad_parm (mode, NULL_TREE,
			   argvec[count].reg && argvec[count].partial == 0,
			   NULL_TREE, &args_size, &argvec[count].offset,
			   &argvec[count].size);

      if (argvec[count].size.var)
	abort ();

#ifndef REG_PARM_STACK_SPACE
      if (argvec[count].partial)
	argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD;
#endif

      if (argvec[count].reg == 0 || argvec[count].partial != 0
#ifdef REG_PARM_STACK_SPACE
	  || 1
#endif
	  )
	args_size.constant += argvec[count].size.constant;

#ifdef ACCUMULATE_OUTGOING_ARGS
      /* If this arg is actually passed on the stack, it might be
	 clobbering something we already put there (this library call might
	 be inside the evaluation of an argument to a function whose call
	 requires the stack).  This will only occur when the library call
	 has sufficient args to run out of argument registers.  Abort in
	 this case; if this ever occurs, code must be added to save and
	 restore the arg slot.  */

      if (argvec[count].reg == 0 || argvec[count].partial != 0)
	abort ();
#endif

      FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree)0, 1);
    }
  va_end (p);

  /* If this machine requires an external definition for library
     functions, write one out.  */
  assemble_external_libcall (fun);

#ifdef STACK_BOUNDARY
  args_size.constant = (((args_size.constant + (STACK_BYTES - 1))
			 / STACK_BYTES) * STACK_BYTES);
#endif

#ifdef REG_PARM_STACK_SPACE
  args_size.constant = MAX (args_size.constant,
			    REG_PARM_STACK_SPACE ((tree) 0));
#endif

#ifdef ACCUMULATE_OUTGOING_ARGS
  if (args_size.constant > current_function_outgoing_args_size)
    current_function_outgoing_args_size = args_size.constant;
  args_size.constant = 0;
#endif

#ifndef PUSH_ROUNDING
  argblock = push_block (GEN_INT (args_size.constant), 0, 0);
#endif

#ifdef PUSH_ARGS_REVERSED
  inc = -1;
  argnum = nargs - 1;
#else
  inc = 1;
  argnum = 0;
#endif

  /* Push the args that need to be pushed.  */

  for (count = 0; count < nargs; count++, argnum += inc)
    {
      register enum machine_mode mode = argvec[argnum].mode;
      register rtx val = argvec[argnum].value;
      rtx reg = argvec[argnum].reg;
      int partial = argvec[argnum].partial;

      if (! (reg != 0 && partial == 0))
	emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0,
			argblock, GEN_INT (argvec[count].offset.constant));
      NO_DEFER_POP;
    }

#ifdef PUSH_ARGS_REVERSED
  argnum = nargs - 1;
#else
  argnum = 0;
#endif

  /* Now load any reg parms into their regs.  */

  for (count = 0; count < nargs; count++, argnum += inc)
    {
      register enum machine_mode mode = argvec[argnum].mode;
      register rtx val = argvec[argnum].value;
      rtx reg = argvec[argnum].reg;
      int partial = argvec[argnum].partial;

      if (reg != 0 && partial == 0)
	emit_move_insn (reg, val);
      NO_DEFER_POP;
    }

  /* For version 1.37, try deleting this entirely.  */
  if (! no_queue)
    emit_queue ();

  /* Any regs containing parms remain in use through the call.  */
  start_sequence ();
  for (count = 0; count < nargs; count++)
    if (argvec[count].reg != 0)
      emit_insn (gen_rtx (USE, VOIDmode, argvec[count].reg));

  use_insns = get_insns ();
  end_sequence ();

  fun = prepare_call_address (fun, NULL_TREE, &use_insns);

  /* Don't allow popping to be deferred, since then
     cse'ing of library calls could delete a call and leave the pop.  */
  NO_DEFER_POP;

  /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which
     will set inhibit_defer_pop to that value.  */

  emit_call_1 (fun, get_identifier (XSTR (orgfun, 0)), args_size.constant, 0,
	       FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1),
	       outmode != VOIDmode ? hard_libcall_value (outmode) : NULL_RTX,
	       old_inhibit_defer_pop + 1, use_insns, no_queue);

  /* Now restore inhibit_defer_pop to its actual original value.  */
  OK_DEFER_POP;
}

/* Expand an assignment that stores the value of FROM into TO.
   If WANT_VALUE is nonzero, return an rtx for the value of TO.
   (This may contain a QUEUED rtx.)
   Otherwise, the returned value is not meaningful.

   SUGGEST_REG is no longer actually used.
   It used to mean, copy the value through a register
   and return that register, if that is possible.
   But now we do this if WANT_VALUE.

   If the value stored is a constant, we return the constant.  */

rtx
expand_assignment (to, from, want_value, suggest_reg)
     tree to, from;
     int want_value;
     int suggest_reg;
{
  register rtx to_rtx = 0;
  rtx result;

  /* Don't crash if the lhs of the assignment was erroneous.  */

  if (TREE_CODE (to) == ERROR_MARK)
    return expand_expr (from, NULL_RTX, VOIDmode, 0);

  /* Assignment of a structure component needs special treatment
     if the structure component's rtx is not simply a MEM.
     Assignment of an array element at a constant index
     has the same problem.  */

  if (TREE_CODE (to) == COMPONENT_REF
      || TREE_CODE (to) == BIT_FIELD_REF
      || (TREE_CODE (to) == ARRAY_REF
	  && TREE_CODE (TREE_OPERAND (to, 1)) == INTEGER_CST
	  && TREE_CODE (TYPE_SIZE (TREE_TYPE (to))) == INTEGER_CST))
    {
      enum machine_mode mode1;
      int bitsize;
      int bitpos;
      tree offset;
      int unsignedp;
      int volatilep = 0;
      tree tem = get_inner_reference (to, &bitsize, &bitpos, &offset,
				      &mode1, &unsignedp, &volatilep);

      /* If we are going to use store_bit_field and extract_bit_field,
	 make sure to_rtx will be safe for multiple use.  */

      if (mode1 == VOIDmode && want_value)
	tem = stabilize_reference (tem);

      to_rtx = expand_expr (tem, NULL_RTX, VOIDmode, 0);
      if (offset != 0)
	{
	  rtx offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, 0);

	  if (GET_CODE (to_rtx) != MEM)
	    abort ();
	  to_rtx = change_address (to_rtx, VOIDmode,
				   gen_rtx (PLUS, Pmode, XEXP (to_rtx, 0),
					    force_reg (Pmode, offset_rtx)));
	}
      if (volatilep)
	{
	  if (GET_CODE (to_rtx) == MEM)
	    MEM_VOLATILE_P (to_rtx) = 1;
#if 0  /* This was turned off because, when a field is volatile
	  in an object which is not volatile, the object may be in a register,
	  and then we would abort over here.  */
	  else
	    abort ();
#endif
	}

      result = store_field (to_rtx, bitsize, bitpos, mode1, from,
			    (want_value
			     /* Spurious cast makes HPUX compiler happy.  */
			     ? (enum machine_mode) TYPE_MODE (TREE_TYPE (to))
			     : VOIDmode),
			    unsignedp,
			    /* Required alignment of containing datum.  */
			    TYPE_ALIGN (TREE_TYPE (tem)) / BITS_PER_UNIT,
			    int_size_in_bytes (TREE_TYPE (tem)));
      preserve_temp_slots (result);
      free_temp_slots ();

      return result;
    }

  /* Ordinary treatment.  Expand TO to get a REG or MEM rtx.
     Don't re-expand if it was expanded already (in COMPONENT_REF case).  */

  if (to_rtx == 0)
    to_rtx = expand_expr (to, NULL_RTX, VOIDmode, 0);

  /* In case we are returning the contents of an object which overlaps
     the place the value is being stored, use a safe function when copying
     a value through a pointer into a structure value return block.  */
  if (TREE_CODE (to) == RESULT_DECL && TREE_CODE (from) == INDIRECT_REF
      && current_function_returns_struct
      && !current_function_returns_pcc_struct)
    {
      rtx from_rtx = expand_expr (from, NULL_RTX, VOIDmode, 0);
      rtx size = expr_size (from);

#ifdef TARGET_MEM_FUNCTIONS
      emit_library_call (memcpy_libfunc, 1,
			 VOIDmode, 3, XEXP (to_rtx, 0), Pmode,
			 XEXP (from_rtx, 0), Pmode,
			 size, Pmode);
#else
      emit_library_call (bcopy_libfunc, 1,
			 VOIDmode, 3, XEXP (from_rtx, 0), Pmode,
			 XEXP (to_rtx, 0), Pmode,
			 size, Pmode);
#endif

      preserve_temp_slots (to_rtx);
      free_temp_slots ();
      return to_rtx;
    }

  /* Compute FROM and store the value in the rtx we got.  */

  result = store_expr (from, to_rtx, want_value);
  preserve_temp_slots (result);
  free_temp_slots ();
  return result;
}

/* Generate code for computing expression EXP,
   and storing the value into TARGET.
   Returns TARGET or an equivalent value.
   TARGET may contain a QUEUED rtx.

   If SUGGEST_REG is nonzero, copy the value through a register
   and return that register, if that is possible.

   If the value stored is a constant, we return the constant.  */

rtx
store_expr (exp, target, suggest_reg)
     register tree exp;
     register rtx target;
     int suggest_reg;
{
  register rtx temp;
  int dont_return_target = 0;

  if (TREE_CODE (exp) == COMPOUND_EXPR)
    {
      /* Perform first part of compound expression, then assign from second
	 part.  */
      expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0);
      emit_queue ();
      return store_expr (TREE_OPERAND (exp, 1), target, suggest_reg);
    }
  else if (TREE_CODE (exp) == COND_EXPR && GET_MODE (target) == BLKmode)
    {
      /* For conditional expression, get safe form of the target.  Then
	 test the condition, doing the appropriate assignment on either
	 side.  This avoids the creation of unnecessary temporaries.
	 For non-BLKmode, it is more efficient not to do this.  */

      rtx lab1 = gen_label_rtx (), lab2 = gen_label_rtx ();

      emit_queue ();
      target = protect_from_queue (target, 1);

      NO_DEFER_POP;
      jumpifnot (TREE_OPERAND (exp, 0), lab1);
      store_expr (TREE_OPERAND (exp, 1), target, suggest_reg);
      emit_queue ();
      emit_jump_insn (gen_jump (lab2));
      emit_barrier ();
      emit_label (lab1);
      store_expr (TREE_OPERAND (exp, 2), target, suggest_reg);
      emit_queue ();
      emit_label (lab2);
      OK_DEFER_POP;
      return target;
    }
  else if (suggest_reg && GET_CODE (target) == MEM
	   && GET_MODE (target) != BLKmode)
    /* If target is in memory and caller wants value in a register instead,
       arrange that.  Pass TARGET as target for expand_expr so that,
       if EXP is another assignment, SUGGEST_REG will be nonzero for it.
       We know expand_expr will not use the target in that case.  */
    {
      temp = expand_expr (exp, cse_not_expected ? NULL_RTX : target,
			  GET_MODE (target), 0);
      if (GET_MODE (temp) != BLKmode && GET_MODE (temp) != VOIDmode)
	temp = copy_to_reg (temp);
      dont_return_target = 1;
    }
  else if (queued_subexp_p (target))
    /* If target contains a postincrement, it is not safe
       to use as the returned value.  It would access the wrong
       place by the time the queued increment gets output.
       So copy the value through a temporary and use that temp
       as the result.  */
    {
      if (GET_MODE (target) != BLKmode && GET_MODE (target) != VOIDmode)
	{
	  /* Expand EXP into a new pseudo.  */
	  temp = gen_reg_rtx (GET_MODE (target));
	  temp = expand_expr (exp, temp, GET_MODE (target), 0);
	}
      else
	temp = expand_expr (exp, NULL_RTX, GET_MODE (target), 0);
      dont_return_target = 1;
    }
  else
    {
      temp = expand_expr (exp, target, GET_MODE (target), 0);
      /* DO return TARGET if it's a specified hardware register.
	 expand_return relies on this.  */
      if (!(target && GET_CODE (target) == REG
	    && REGNO (target) < FIRST_PSEUDO_REGISTER)
	  && CONSTANT_P (temp))
	dont_return_target = 1;
    }

  /* If value was not generated in the target, store it there.
     Convert the value to TARGET's type first if nec.  */

  if (temp != target && TREE_CODE (exp) != ERROR_MARK)
    {
      target = protect_from_queue (target, 1);
      if (GET_MODE (temp) != GET_MODE (target)
	  && GET_MODE (temp) != VOIDmode)
	{
	  int unsignedp = TREE_UNSIGNED (TREE_TYPE (exp));
	  if (dont_return_target)
	    {
	      /* In this case, we will return TEMP,
		 so make sure it has the proper mode.
		 But don't forget to store the value into TARGET.  */
	      temp = convert_to_mode (GET_MODE (target), temp, unsignedp);
	      emit_move_insn (target, temp);
	    }
	  else
	    convert_move (target, temp, unsignedp);
	}

      else if (GET_MODE (temp) == BLKmode && TREE_CODE (exp) == STRING_CST)
	{
	  /* Handle copying a string constant into an array.
	     The string constant may be shorter than the array.
	     So copy just the string's actual length, and clear the rest.  */
	  rtx size;

	  /* Get the size of the data type of the string,
	     which is actually the size of the target.  */
	  size = expr_size (exp);
	  if (GET_CODE (size) == CONST_INT
	      && INTVAL (size) < TREE_STRING_LENGTH (exp))
	    emit_block_move (target, temp, size,
			     TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT);
	  else
	    {
	      /* Compute the size of the data to copy from the string.  */
	      tree copy_size
		= fold (build (MIN_EXPR, sizetype,
			       size_binop (CEIL_DIV_EXPR,
					   TYPE_SIZE (TREE_TYPE (exp)),
					   size_int (BITS_PER_UNIT)),
			       convert (sizetype,
					build_int_2 (TREE_STRING_LENGTH (exp), 0))));
	      rtx copy_size_rtx = expand_expr (copy_size, NULL_RTX,
					       VOIDmode, 0);
	      rtx label = 0;

	      /* Copy that much.  */
	      emit_block_move (target, temp, copy_size_rtx,
			       TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT);

	      /* Figure out how much is left in TARGET
		 that we have to clear.  */
	      if (GET_CODE (copy_size_rtx) == CONST_INT)
		{
		  temp = plus_constant (XEXP (target, 0),
					TREE_STRING_LENGTH (exp));
		  size = plus_constant (size,
					- TREE_STRING_LENGTH (exp));
		}
	      else
		{
		  enum machine_mode size_mode = Pmode;

		  temp = force_reg (Pmode, XEXP (target, 0));
		  temp = expand_binop (size_mode, add_optab, temp,
				       copy_size_rtx, NULL_RTX, 0,
				       OPTAB_LIB_WIDEN);

		  size = expand_binop (size_mode, sub_optab, size,
				       copy_size_rtx, NULL_RTX, 0,
				       OPTAB_LIB_WIDEN);

		  emit_cmp_insn (size, const0_rtx, LT, NULL_RTX,
				 GET_MODE (size), 0, 0);
		  label = gen_label_rtx ();
		  emit_jump_insn (gen_blt (label));
		}

	      if (size != const0_rtx)
		{
#ifdef TARGET_MEM_FUNCTIONS
		  emit_library_call (memset_libfunc, 1, VOIDmode, 3,
				     temp, Pmode, const0_rtx, Pmode, size, Pmode);
#else
		  emit_library_call (bzero_libfunc, 1, VOIDmode, 2,
				     temp, Pmode, size, Pmode);
#endif
		}
	      if (label)
		emit_label (label);
	    }
	}
      else if (GET_MODE (temp) == BLKmode)
	emit_block_move (target, temp, expr_size (exp),
			 TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT);
      else
	emit_move_insn (target, temp);
    }
  if (dont_return_target)
    return temp;
  return target;
}

/* Store the value of constructor EXP into the rtx TARGET.
   TARGET is either a REG or a MEM.  */

static void
store_constructor (exp, target)
     tree exp;
     rtx target;
{
  tree type = TREE_TYPE (exp);

  /* We know our target cannot conflict, since safe_from_p has been called.  */
#if 0
  /* Don't try copying piece by piece into a hard register
     since that is vulnerable to being clobbered by EXP.
     Instead, construct in a pseudo register and then copy it all.  */
  if (GET_CODE (target) == REG && REGNO (target) < FIRST_PSEUDO_REGISTER)
    {
      rtx temp = gen_reg_rtx (GET_MODE (target));
      store_constructor (exp, temp);
      emit_move_insn (target, temp);
      return;
    }
#endif

  if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
    {
      register tree elt;

      /* Inform later passes that the whole union value is dead.  */
      if (TREE_CODE (type) == UNION_TYPE)
	emit_insn (gen_rtx (CLOBBER, VOIDmode, target));

      /* If we are building a static constructor into a register,
	 set the initial value as zero so we can fold the value into
	 a constant.  */
      else if (GET_CODE (target) == REG && TREE_STATIC (exp))
	emit_move_insn (target, const0_rtx);

      /* If the constructor has fewer fields than the structure,
	 clear the whole structure first.  */
      else if (list_length (CONSTRUCTOR_ELTS (exp))
	       != list_length (TYPE_FIELDS (type)))
	clear_storage (target, int_size_in_bytes (type));
      else
	/* Inform later passes that the old value is dead.  */
	emit_insn (gen_rtx (CLOBBER, VOIDmode, target));

      /* Store each element of the constructor into
	 the corresponding field of TARGET.  */

      for (elt = CONSTRUCTOR_ELTS (exp); elt; elt = TREE_CHAIN (elt))
	{
	  register tree field = TREE_PURPOSE (elt);
	  register enum machine_mode mode;
	  int bitsize;
	  int bitpos;
	  int unsignedp;

	  /* Just ignore missing fields.
	     We cleared the whole structure, above,
	     if any fields are missing.  */
	  if (field == 0)
	    continue;

	  bitsize = TREE_INT_CST_LOW (DECL_SIZE (field));
	  unsignedp = TREE_UNSIGNED (field);
	  mode = DECL_MODE (field);
	  if (DECL_BIT_FIELD (field))
	    mode = VOIDmode;

	  if (TREE_CODE (DECL_FIELD_BITPOS (field)) != INTEGER_CST)
	    /* ??? This case remains to be written.  */
	    abort ();

	  bitpos = TREE_INT_CST_LOW (DECL_FIELD_BITPOS (field));

	  store_field (target, bitsize, bitpos, mode, TREE_VALUE (elt),
		       /* The alignment of TARGET is
			  at least what its type requires.  */
		       VOIDmode, 0,
		       TYPE_ALIGN (type) / BITS_PER_UNIT,
		       int_size_in_bytes (type));
	}
    }
  else if (TREE_CODE (type) == ARRAY_TYPE)
    {
      register tree elt;
      register int i;
      tree domain = TYPE_DOMAIN (type);
      HOST_WIDE_INT minelt = TREE_INT_CST_LOW (TYPE_MIN_VALUE (domain));
      HOST_WIDE_INT maxelt = TREE_INT_CST_LOW (TYPE_MAX_VALUE (domain));
      tree elttype = TREE_TYPE (type);

      /* If the constructor has fewer fields than the structure,
	 clear the whole structure first.  Similarly if this this is
	 static constructor of a non-BLKmode object.  */

      if (list_length (CONSTRUCTOR_ELTS (exp)) < maxelt - minelt + 1
	  || (GET_CODE (target) == REG && TREE_STATIC (exp)))
	clear_storage (target, maxelt - minelt + 1);
      else
	/* Inform later passes that the old value is dead.  */
	emit_insn (gen_rtx (CLOBBER, VOIDmode, target));

      /* Store each element of the constructor into
	 the corresponding element of TARGET, determined
	 by counting the elements.  */
      for (elt = CONSTRUCTOR_ELTS (exp), i = 0;
	   elt;
	   elt = TREE_CHAIN (elt), i++)
	{
	  register enum machine_mode mode;
	  int bitsize;
	  int bitpos;
	  int unsignedp;

	  mode = TYPE_MODE (elttype);
	  bitsize = GET_MODE_BITSIZE (mode);
	  unsignedp = TREE_UNSIGNED (elttype);

	  bitpos = (i * TREE_INT_CST_LOW (TYPE_SIZE (elttype)));

	  store_field (target, bitsize, bitpos, mode, TREE_VALUE (elt),
		       /* The alignment of TARGET is
			  at least what its type requires.  */
		       VOIDmode, 0,
		       TYPE_ALIGN (type) / BITS_PER_UNIT,
		       int_size_in_bytes (type));
	}
    }

  else
    abort ();
}

/* Store the value of EXP (an expression tree)
   into a subfield of TARGET which has mode MODE and occupies
   BITSIZE bits, starting BITPOS bits from the start of TARGET.
   If MODE is VOIDmode, it means that we are storing into a bit-field.

   If VALUE_MODE is VOIDmode, return nothing in particular.
   UNSIGNEDP is not used in this case.

   Otherwise, return an rtx for the value stored.  This rtx
   has mode VALUE_MODE if that is convenient to do.
   In this case, UNSIGNEDP must be nonzero if the value is an unsigned type.

   ALIGN is the alignment that TARGET is known to have, measured in bytes.
   TOTAL_SIZE is the size in bytes of the structure, or -1 if varying.  */

static rtx
store_field (target, bitsize, bitpos, mode, exp, value_mode,
	     unsignedp, align, total_size)
     rtx target;
     int bitsize, bitpos;
     enum machine_mode mode;
     tree exp;
     enum machine_mode value_mode;
     int unsignedp;
     int align;
     int total_size;
{
  HOST_WIDE_INT width_mask = 0;

  if (bitsize < HOST_BITS_PER_WIDE_INT)
    width_mask = ((HOST_WIDE_INT) 1 << bitsize) - 1;

  /* If we are storing into an unaligned field of an aligned union that is
     in a register, we may have the mode of TARGET being an integer mode but
     MODE == BLKmode.  In that case, get an aligned object whose size and
     alignment are the same as TARGET and store TARGET into it (we can avoid
     the store if the field being stored is the entire width of TARGET).  Then
     call ourselves recursively to store the field into a BLKmode version of
     that object.  Finally, load from the object into TARGET.  This is not
     very efficient in general, but should only be slightly more expensive
     than the otherwise-required unaligned accesses.  Perhaps this can be
     cleaned up later.  */

  if (mode == BLKmode
      && (GET_CODE (target) == REG || GET_CODE (target) == SUBREG))
    {
      rtx object = assign_stack_temp (GET_MODE (target),
				      GET_MODE_SIZE (GET_MODE (target)), 0);
      rtx blk_object = copy_rtx (object);

      PUT_MODE (blk_object, BLKmode);

      if (bitsize != GET_MODE_BITSIZE (GET_MODE (target)))
	emit_move_insn (object, target);

      store_field (blk_object, bitsize, bitpos, mode, exp, VOIDmode, 0,
		   align, total_size);

      emit_move_insn (target, object);

      return target;
    }

  /* If the structure is in a register or if the component
     is a bit field, we cannot use addressing to access it.
     Use bit-field techniques or SUBREG to store in it.  */

  if (mode == VOIDmode
      || (mode != BLKmode && ! direct_store[(int) mode])
      || GET_CODE (target) == REG
      || GET_CODE (target) == SUBREG)
    {
      rtx temp = expand_expr (exp, NULL_RTX, VOIDmode, 0);
      /* Store the value in the bitfield.  */
      store_bit_field (target, bitsize, bitpos, mode, temp, align, total_size);
      if (value_mode != VOIDmode)
	{
	  /* The caller wants an rtx for the value.  */
	  /* If possible, avoid refetching from the bitfield itself.  */
	  if (width_mask != 0
	      && ! (GET_CODE (target) == MEM && MEM_VOLATILE_P (target)))
	    return expand_and (temp, GEN_INT (width_mask), NULL_RTX);
	  return extract_bit_field (target, bitsize, bitpos, unsignedp,
				    NULL_RTX, value_mode, 0, align,
				    total_size);
	}
      return const0_rtx;
    }
  else
    {
      rtx addr = XEXP (target, 0);
      rtx to_rtx;

      /* If a value is wanted, it must be the lhs;
	 so make the address stable for multiple use.  */

      if (value_mode != VOIDmode && GET_CODE (addr) != REG
	  && ! CONSTANT_ADDRESS_P (addr)
	  /* A frame-pointer reference is already stable.  */
	  && ! (GET_CODE (addr) == PLUS
		&& GET_CODE (XEXP (addr, 1)) == CONST_INT
		&& (XEXP (addr, 0) == virtual_incoming_args_rtx
		    || XEXP (addr, 0) == virtual_stack_vars_rtx)))
	addr = copy_to_reg (addr);

      /* Now build a reference to just the desired component.  */

      to_rtx = change_address (target, mode,
			       plus_constant (addr, (bitpos / BITS_PER_UNIT)));
      MEM_IN_STRUCT_P (to_rtx) = 1;

      return store_expr (exp, to_rtx, value_mode != VOIDmode);
    }
}

/* Given an expression EXP that may be a COMPONENT_REF, a BIT_FIELD_REF,
   or an ARRAY_REF, look for nested COMPONENT_REFs, BIT_FIELD_REFs, or
   ARRAY_REFs at constant positions and find the ultimate containing object,
   which we return.

   We set *PBITSIZE to the size in bits that we want, *PBITPOS to the
   bit position, and *PUNSIGNEDP to the signedness of the field.
   If the position of the field is variable, we store a tree
   giving the variable offset (in units) in *POFFSET.
   This offset is in addition to the bit position.
   If the position is not variable, we store 0 in *POFFSET.

   If any of the extraction expressions is volatile,
   we store 1 in *PVOLATILEP.  Otherwise we don't change that.

   If the field is a bit-field, *PMODE is set to VOIDmode.  Otherwise, it
   is a mode that can be used to access the field.  In that case, *PBITSIZE
   is redundant.

   If the field describes a variable-sized object, *PMODE is set to
   VOIDmode and *PBITSIZE is set to -1.  An access cannot be made in
   this case, but the address of the object can be found.  */

tree
get_inner_reference (exp, pbitsize, pbitpos, poffset, pmode, punsignedp, pvolatilep)
     tree exp;
     int *pbitsize;
     int *pbitpos;
     tree *poffset;
     enum machine_mode *pmode;
     int *punsignedp;
     int *pvolatilep;
{
  tree size_tree = 0;
  enum machine_mode mode = VOIDmode;
  tree offset = 0;

  if (TREE_CODE (exp) == COMPONENT_REF)
    {
      size_tree = DECL_SIZE (TREE_OPERAND (exp, 1));
      if (! DECL_BIT_FIELD (TREE_OPERAND (exp, 1)))
	mode = DECL_MODE (TREE_OPERAND (exp, 1));
      *punsignedp = TREE_UNSIGNED (TREE_OPERAND (exp, 1));
    }
  else if (TREE_CODE (exp) == BIT_FIELD_REF)
    {
      size_tree = TREE_OPERAND (exp, 1);
      *punsignedp = TREE_UNSIGNED (exp);
    }
  else
    {
      mode = TYPE_MODE (TREE_TYPE (exp));
      *pbitsize = GET_MODE_BITSIZE (mode);
      *punsignedp = TREE_UNSIGNED (TREE_TYPE (exp));
    }
      
  if (size_tree)
    {
      if (TREE_CODE (size_tree) != INTEGER_CST)
	mode = BLKmode, *pbitsize = -1;
      else
	*pbitsize = TREE_INT_CST_LOW (size_tree);
    }

  /* Compute cumulative bit-offset for nested component-refs and array-refs,
     and find the ultimate containing object.  */

  *pbitpos = 0;

  while (1)
    {
      if (TREE_CODE (exp) == COMPONENT_REF || TREE_CODE (exp) == BIT_FIELD_REF)
	{
	  tree pos = (TREE_CODE (exp) == COMPONENT_REF
		      ? DECL_FIELD_BITPOS (TREE_OPERAND (exp, 1))
		      : TREE_OPERAND (exp, 2));

	  if (TREE_CODE (pos) == PLUS_EXPR)
	    {
	      tree constant, var;
	      if (TREE_CODE (TREE_OPERAND (pos, 0)) == INTEGER_CST)
		{
		  constant = TREE_OPERAND (pos, 0);
		  var = TREE_OPERAND (pos, 1);
		}
	      else if (TREE_CODE (TREE_OPERAND (pos, 1)) == INTEGER_CST)
		{
		  constant = TREE_OPERAND (pos, 1);
		  var = TREE_OPERAND (pos, 0);
		}
	      else
		abort ();
	      *pbitpos += TREE_INT_CST_LOW (constant);
	      if (offset)
		offset = size_binop (PLUS_EXPR, offset,
				     size_binop (FLOOR_DIV_EXPR, var,
						 size_int (BITS_PER_UNIT)));
	      else
		offset = size_binop (FLOOR_DIV_EXPR, var,
				     size_int (BITS_PER_UNIT));
	    }
	  else if (TREE_CODE (pos) == INTEGER_CST)
	    *pbitpos += TREE_INT_CST_LOW (pos);
	  else
	    {
	      /* Assume here that the offset is a multiple of a unit.
		 If not, there should be an explicitly added constant.  */
	      if (offset)
		offset = size_binop (PLUS_EXPR, offset,
				     size_binop (FLOOR_DIV_EXPR, pos,
						 size_int (BITS_PER_UNIT)));
	      else
		offset = size_binop (FLOOR_DIV_EXPR, pos,
				     size_int (BITS_PER_UNIT));
	    }
	}

      else if (TREE_CODE (exp) == ARRAY_REF
	       && TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
	       && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) == INTEGER_CST)
	{
	  *pbitpos += (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1))
		       * TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (exp))));
	}
      else if (TREE_CODE (exp) != NON_LVALUE_EXPR
	       && ! ((TREE_CODE (exp) == NOP_EXPR
		      || TREE_CODE (exp) == CONVERT_EXPR)
		     && (TYPE_MODE (TREE_TYPE (exp))
			 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))))
	break;

      /* If any reference in the chain is volatile, the effect is volatile.  */
      if (TREE_THIS_VOLATILE (exp))
	*pvolatilep = 1;
      exp = TREE_OPERAND (exp, 0);
    }

  /* If this was a bit-field, see if there is a mode that allows direct
     access in case EXP is in memory.  */
  if (mode == VOIDmode && *pbitpos % *pbitsize == 0)
    {
      mode = mode_for_size (*pbitsize, MODE_INT, 0);
      if (mode == BLKmode)
	mode = VOIDmode;
    }

  *pmode = mode;
  *poffset = offset;
#if 0
  /* We aren't finished fixing the callers to really handle nonzero offset.  */
  if (offset != 0)
    abort ();
#endif

  return exp;
}

/* Given an rtx VALUE that may contain additions and multiplications,
   return an equivalent value that just refers to a register or memory.
   This is done by generating instructions to perform the arithmetic
   and returning a pseudo-register containing the value.  */

rtx
force_operand (value, target)
     rtx value, target;
{
  register optab binoptab = 0;
  /* Use a temporary to force order of execution of calls to
     `force_operand'.  */
  rtx tmp;
  register rtx op2;
  /* Use subtarget as the target for operand 0 of a binary operation.  */
  register rtx subtarget = (target != 0 && GET_CODE (target) == REG ? target : 0);

  if (GET_CODE (value) == PLUS)
    binoptab = add_optab;
  else if (GET_CODE (value) == MINUS)
    binoptab = sub_optab;
  else if (GET_CODE (value) == MULT)
    {
      op2 = XEXP (value, 1);
      if (!CONSTANT_P (op2)
	  && !(GET_CODE (op2) == REG && op2 != subtarget))
	subtarget = 0;
      tmp = force_operand (XEXP (value, 0), subtarget);
      return expand_mult (GET_MODE (value), tmp,
			  force_operand (op2, NULL_RTX),
			  target, 0);
    }

  if (binoptab)
    {
      op2 = XEXP (value, 1);
      if (!CONSTANT_P (op2)
	  && !(GET_CODE (op2) == REG && op2 != subtarget))
	subtarget = 0;
      if (binoptab == sub_optab && GET_CODE (op2) == CONST_INT)
	{
	  binoptab = add_optab;
	  op2 = negate_rtx (GET_MODE (value), op2);
	}

      /* Check for an addition with OP2 a constant integer and our first
	 operand a PLUS of a virtual register and something else.  In that
	 case, we want to emit the sum of the virtual register and the
	 constant first and then add the other value.  This allows virtual
	 register instantiation to simply modify the constant rather than
	 creating another one around this addition.  */
      if (binoptab == add_optab && GET_CODE (op2) == CONST_INT
	  && GET_CODE (XEXP (value, 0)) == PLUS
	  && GET_CODE (XEXP (XEXP (value, 0), 0)) == REG
	  && REGNO (XEXP (XEXP (value, 0), 0)) >= FIRST_VIRTUAL_REGISTER
	  && REGNO (XEXP (XEXP (value, 0), 0)) <= LAST_VIRTUAL_REGISTER)
	{
	  rtx temp = expand_binop (GET_MODE (value), binoptab,
				   XEXP (XEXP (value, 0), 0), op2,
				   subtarget, 0, OPTAB_LIB_WIDEN);
	  return expand_binop (GET_MODE (value), binoptab, temp,
			       force_operand (XEXP (XEXP (value, 0), 1), 0),
			       target, 0, OPTAB_LIB_WIDEN);
	}
				   
      tmp = force_operand (XEXP (value, 0), subtarget);
      return expand_binop (GET_MODE (value), binoptab, tmp,
			   force_operand (op2, NULL_RTX),
			   target, 0, OPTAB_LIB_WIDEN);
      /* We give UNSIGNEP = 0 to expand_binop
	 because the only operations we are expanding here are signed ones.  */
    }
  return value;
}

/* Subroutine of expand_expr:
   save the non-copied parts (LIST) of an expr (LHS), and return a list
   which can restore these values to their previous values,
   should something modify their storage.  */

static tree
save_noncopied_parts (lhs, list)
     tree lhs;
     tree list;
{
  tree tail;
  tree parts = 0;

  for (tail = list; tail; tail = TREE_CHAIN (tail))
    if (TREE_CODE (TREE_VALUE (tail)) == TREE_LIST)
      parts = chainon (parts, save_noncopied_parts (lhs, TREE_VALUE (tail)));
    else
      {
	tree part = TREE_VALUE (tail);
	tree part_type = TREE_TYPE (part);
	tree to_be_saved = build (COMPONENT_REF, part_type, lhs, part);
	rtx target = assign_stack_temp (TYPE_MODE (part_type),
					int_size_in_bytes (part_type), 0);
	if (! memory_address_p (TYPE_MODE (part_type), XEXP (target, 0)))
	  target = change_address (target, TYPE_MODE (part_type), NULL_RTX);
	parts = tree_cons (to_be_saved,
			   build (RTL_EXPR, part_type, NULL_TREE,
				  (tree) target),
			   parts);
	store_expr (TREE_PURPOSE (parts), RTL_EXPR_RTL (TREE_VALUE (parts)), 0);
      }
  return parts;
}

/* Subroutine of expand_expr:
   record the non-copied parts (LIST) of an expr (LHS), and return a list
   which specifies the initial values of these parts.  */

static tree
init_noncopied_parts (lhs, list)
     tree lhs;
     tree list;
{
  tree tail;
  tree parts = 0;

  for (tail = list; tail; tail = TREE_CHAIN (tail))
    if (TREE_CODE (TREE_VALUE (tail)) == TREE_LIST)
      parts = chainon (parts, init_noncopied_parts (lhs, TREE_VALUE (tail)));
    else
      {
	tree part = TREE_VALUE (tail);
	tree part_type = TREE_TYPE (part);
	tree to_be_initialized = build (COMPONENT_REF, part_type, lhs, part);
	parts = tree_cons (TREE_PURPOSE (tail), to_be_initialized, parts);
      }
  return parts;
}

/* Subroutine of expand_expr: return nonzero iff there is no way that
   EXP can reference X, which is being modified.  */

static int
safe_from_p (x, exp)
     rtx x;
     tree exp;
{
  rtx exp_rtl = 0;
  int i, nops;

  if (x == 0)
    return 1;

  /* If this is a subreg of a hard register, declare it unsafe, otherwise,
     find the underlying pseudo.  */
  if (GET_CODE (x) == SUBREG)
    {
      x = SUBREG_REG (x);
      if (GET_CODE (x) == REG && REGNO (x) < FIRST_PSEUDO_REGISTER)
	return 0;
    }

  /* If X is a location in the outgoing argument area, it is always safe.  */
  if (GET_CODE (x) == MEM
      && (XEXP (x, 0) == virtual_outgoing_args_rtx
	  || (GET_CODE (XEXP (x, 0)) == PLUS
	      && XEXP (XEXP (x, 0), 0) == virtual_outgoing_args_rtx)))
    return 1;

  switch (TREE_CODE_CLASS (TREE_CODE (exp)))
    {
    case 'd':
      exp_rtl = DECL_RTL (exp);
      break;

    case 'c':
      return 1;

    case 'x':
      if (TREE_CODE (exp) == TREE_LIST)
	return ((TREE_VALUE (exp) == 0
		 || safe_from_p (x, TREE_VALUE (exp)))
		&& (TREE_CHAIN (exp) == 0
		    || safe_from_p (x, TREE_CHAIN (exp))));
      else
	return 0;

    case '1':
      return safe_from_p (x, TREE_OPERAND (exp, 0));

    case '2':
    case '<':
      return (safe_from_p (x, TREE_OPERAND (exp, 0))
	      && safe_from_p (x, TREE_OPERAND (exp, 1)));

    case 'e':
    case 'r':
      /* Now do code-specific tests.  EXP_RTL is set to any rtx we find in
	 the expression.  If it is set, we conflict iff we are that rtx or
	 both are in memory.  Otherwise, we check all operands of the
	 expression recursively.  */

      switch (TREE_CODE (exp))
	{
	case ADDR_EXPR:
	  return staticp (TREE_OPERAND (exp, 0));

	case INDIRECT_REF:
	  if (GET_CODE (x) == MEM)
	    return 0;
	  break;

	case CALL_EXPR:
	  exp_rtl = CALL_EXPR_RTL (exp);
	  if (exp_rtl == 0)
	    {
	      /* Assume that the call will clobber all hard registers and
		 all of memory.  */
	      if ((GET_CODE (x) == REG && REGNO (x) < FIRST_PSEUDO_REGISTER)
		  || GET_CODE (x) == MEM)
		return 0;
	    }

	  break;

	case RTL_EXPR:
	  exp_rtl = RTL_EXPR_RTL (exp);
	  if (exp_rtl == 0)
	    /* We don't know what this can modify.  */
	    return 0;

	  break;

	case WITH_CLEANUP_EXPR:
	  exp_rtl = RTL_EXPR_RTL (exp);
	  break;

	case SAVE_EXPR:
	  exp_rtl = SAVE_EXPR_RTL (exp);
	  break;

	case BIND_EXPR:
	  /* The only operand we look at is operand 1.  The rest aren't
	     part of the expression.  */
	  return safe_from_p (x, TREE_OPERAND (exp, 1));

	case METHOD_CALL_EXPR:
	  /* This takes a rtx argument, but shouldn't appear here. */
	  abort ();
	}

      /* If we have an rtx, we do not need to scan our operands.  */
      if (exp_rtl)
	break;

      nops = tree_code_length[(int) TREE_CODE (exp)];
      for (i = 0; i < nops; i++)
	if (TREE_OPERAND (exp, i) != 0
	    && ! safe_from_p (x, TREE_OPERAND (exp, i)))
	  return 0;
    }

  /* If we have an rtl, find any enclosed object.  Then see if we conflict
     with it.  */
  if (exp_rtl)
    {
      if (GET_CODE (exp_rtl) == SUBREG)
	{
	  exp_rtl = SUBREG_REG (exp_rtl);
	  if (GET_CODE (exp_rtl) == REG
	      && REGNO (exp_rtl) < FIRST_PSEUDO_REGISTER)
	    return 0;
	}

      /* If the rtl is X, then it is not safe.  Otherwise, it is unless both
	 are memory and EXP is not readonly.  */
      return ! (rtx_equal_p (x, exp_rtl)
		|| (GET_CODE (x) == MEM && GET_CODE (exp_rtl) == MEM
		    && ! TREE_READONLY (exp)));
    }

  /* If we reach here, it is safe.  */
  return 1;
}

/* Subroutine of expand_expr: return nonzero iff EXP is an
   expression whose type is statically determinable.  */

static int
fixed_type_p (exp)
     tree exp;
{
  if (TREE_CODE (exp) == PARM_DECL
      || TREE_CODE (exp) == VAR_DECL
      || TREE_CODE (exp) == CALL_EXPR || TREE_CODE (exp) == TARGET_EXPR
      || TREE_CODE (exp) == COMPONENT_REF
      || TREE_CODE (exp) == ARRAY_REF)
    return 1;
  return 0;
}

/* expand_expr: generate code for computing expression EXP.
   An rtx for the computed value is returned.  The value is never null.
   In the case of a void EXP, const0_rtx is returned.

   The value may be stored in TARGET if TARGET is nonzero.
   TARGET is just a suggestion; callers must assume that
   the rtx returned may not be the same as TARGET.

   If TARGET is CONST0_RTX, it means that the value will be ignored.

   If TMODE is not VOIDmode, it suggests generating the
   result in mode TMODE.  But this is done only when convenient.
   Otherwise, TMODE is ignored and the value generated in its natural mode.
   TMODE is just a suggestion; callers must assume that
   the rtx returned may not have mode TMODE.

   EXPAND_CONST_ADDRESS says that it is okay to return a MEM
   with a constant address even if that address is not normally legitimate.
   EXPAND_INITIALIZER and EXPAND_SUM also have this effect.

   If MODIFIER is EXPAND_SUM then when EXP is an addition
   we can return an rtx of the form (MULT (REG ...) (CONST_INT ...))
   or a nest of (PLUS ...) and (MINUS ...) where the terms are
   products as above, or REG or MEM, or constant.
   Ordinarily in such cases we would output mul or add instructions
   and then return a pseudo reg containing the sum.

   EXPAND_INITIALIZER is much like EXPAND_SUM except that
   it also marks a label as absolutely required (it can't be dead).
   It also makes a ZERO_EXTEND or SIGN_EXTEND instead of emitting extend insns.
   This is used for outputting expressions used in initializers.  */

rtx
expand_expr (exp, target, tmode, modifier)
     register tree exp;
     rtx target;
     enum machine_mode tmode;
     enum expand_modifier modifier;
{
  register rtx op0, op1, temp;
  tree type = TREE_TYPE (exp);
  int unsignedp = TREE_UNSIGNED (type);
  register enum machine_mode mode = TYPE_MODE (type);
  register enum tree_code code = TREE_CODE (exp);
  optab this_optab;
  /* Use subtarget as the target for operand 0 of a binary operation.  */
  rtx subtarget = (target != 0 && GET_CODE (target) == REG ? target : 0);
  rtx original_target = target;
  int ignore = target == const0_rtx;
  tree context;

  /* Don't use hard regs as subtargets, because the combiner
     can only handle pseudo regs.  */
  if (subtarget && REGNO (subtarget) < FIRST_PSEUDO_REGISTER)
    subtarget = 0;
  /* Avoid subtargets inside loops,
     since they hide some invariant expressions.  */
  if (preserve_subexpressions_p ())
    subtarget = 0;

  if (ignore) target = 0, original_target = 0;

  /* If will do cse, generate all results into pseudo registers
     since 1) that allows cse to find more things
     and 2) otherwise cse could produce an insn the machine
     cannot support.  */

  if (! cse_not_expected && mode != BLKmode && target
      && (GET_CODE (target) != REG || REGNO (target) < FIRST_PSEUDO_REGISTER))
    target = subtarget;

  /* Ensure we reference a volatile object even if value is ignored.  */
  if (ignore && TREE_THIS_VOLATILE (exp)
      && mode != VOIDmode && mode != BLKmode)
    {
      target = gen_reg_rtx (mode);
      temp = expand_expr (exp, target, VOIDmode, modifier);
      if (temp != target)
	emit_move_insn (target, temp);
      return target;
    }

  switch (code)
    {
    case LABEL_DECL:
      {
	tree function = decl_function_context (exp);
	/* Handle using a label in a containing function.  */
	if (function != current_function_decl && function != 0)
	  {
	    struct function *p = find_function_data (function);
	    /* Allocate in the memory associated with the function
	       that the label is in.  */
	    push_obstacks (p->function_obstack,
			   p->function_maybepermanent_obstack);

	    p->forced_labels = gen_rtx (EXPR_LIST, VOIDmode,
					label_rtx (exp), p->forced_labels);
	    pop_obstacks ();
	  }
	else if (modifier == EXPAND_INITIALIZER)
	  forced_labels = gen_rtx (EXPR_LIST, VOIDmode,
				   label_rtx (exp), forced_labels);
	temp = gen_rtx (MEM, FUNCTION_MODE,
			gen_rtx (LABEL_REF, Pmode, label_rtx (exp)));
	if (function != current_function_decl && function != 0)
	  LABEL_REF_NONLOCAL_P (XEXP (temp, 0)) = 1;
	return temp;
      }

    case PARM_DECL:
      if (DECL_RTL (exp) == 0)
	{
	  error_with_decl (exp, "prior parameter's size depends on `%s'");
	  return CONST0_RTX (mode);
	}

    case FUNCTION_DECL:
    case VAR_DECL:
    case RESULT_DECL:
      if (DECL_RTL (exp) == 0)
	abort ();
      /* Ensure variable marked as used
	 even if it doesn't go through a parser.  */
      TREE_USED (exp) = 1;
      /* Handle variables inherited from containing functions.  */
      context = decl_function_context (exp);

      /* We treat inline_function_decl as an alias for the current function
	 because that is the inline function whose vars, types, etc.
	 are being merged into the current function.
	 See expand_inline_function.  */
      if (context != 0 && context != current_function_decl
	  && context != inline_function_decl
	  /* If var is static, we don't need a static chain to access it.  */
	  && ! (GET_CODE (DECL_RTL (exp)) == MEM
		&& CONSTANT_P (XEXP (DECL_RTL (exp), 0))))
	{
	  rtx addr;

	  /* Mark as non-local and addressable.  */
	  DECL_NONLOCAL (exp) = 1;
	  mark_addressable (exp);
	  if (GET_CODE (DECL_RTL (exp)) != MEM)
	    abort ();
	  addr = XEXP (DECL_RTL (exp), 0);
	  if (GET_CODE (addr) == MEM)
	    addr = gen_rtx (MEM, Pmode, fix_lexical_addr (XEXP (addr, 0), exp));
	  else
	    addr = fix_lexical_addr (addr, exp);
	  return change_address (DECL_RTL (exp), mode, addr);
	}

      /* This is the case of an array whose size is to be determined
	 from its initializer, while the initializer is still being parsed.
	 See expand_decl.  */
      if (GET_CODE (DECL_RTL (exp)) == MEM
	  && GET_CODE (XEXP (DECL_RTL (exp), 0)) == REG)
	return change_address (DECL_RTL (exp), GET_MODE (DECL_RTL (exp)),
			       XEXP (DECL_RTL (exp), 0));
      if (GET_CODE (DECL_RTL (exp)) == MEM
	  && modifier != EXPAND_CONST_ADDRESS
	  && modifier != EXPAND_SUM
	  && modifier != EXPAND_INITIALIZER)
	{
	  /* DECL_RTL probably contains a constant address.
	     On RISC machines where a constant address isn't valid,
	     make some insns to get that address into a register.  */
	  if (!memory_address_p (DECL_MODE (exp), XEXP (DECL_RTL (exp), 0))
	      || (flag_force_addr
		  && CONSTANT_ADDRESS_P (XEXP (DECL_RTL (exp), 0))))
	    return change_address (DECL_RTL (exp), VOIDmode,
				   copy_rtx (XEXP (DECL_RTL (exp), 0)));
	}
      return DECL_RTL (exp);

    case INTEGER_CST:
      return immed_double_const (TREE_INT_CST_LOW (exp),
				 TREE_INT_CST_HIGH (exp),
				 mode);

    case CONST_DECL:
      return expand_expr (DECL_INITIAL (exp), target, VOIDmode, 0);

    case REAL_CST:
      /* If optimized, generate immediate CONST_DOUBLE
	 which will be turned into memory by reload if necessary. 
     
	 We used to force a register so that loop.c could see it.  But
	 this does not allow gen_* patterns to perform optimizations with
	 the constants.  It also produces two insns in cases like "x = 1.0;".
	 On most machines, floating-point constants are not permitted in
	 many insns, so we'd end up copying it to a register in any case.

	 Now, we do the copying in expand_binop, if appropriate.  */
      return immed_real_const (exp);

    case COMPLEX_CST:
    case STRING_CST:
      if (! TREE_CST_RTL (exp))
	output_constant_def (exp);

      /* TREE_CST_RTL probably contains a constant address.
	 On RISC machines where a constant address isn't valid,
	 make some insns to get that address into a register.  */
      if (GET_CODE (TREE_CST_RTL (exp)) == MEM
	  && modifier != EXPAND_CONST_ADDRESS
	  && modifier != EXPAND_INITIALIZER
	  && modifier != EXPAND_SUM
	  && !memory_address_p (mode, XEXP (TREE_CST_RTL (exp), 0)))
	return change_address (TREE_CST_RTL (exp), VOIDmode,
			       copy_rtx (XEXP (TREE_CST_RTL (exp), 0)));
      return TREE_CST_RTL (exp);

    case SAVE_EXPR:
      context = decl_function_context (exp);
      /* We treat inline_function_decl as an alias for the current function
	 because that is the inline function whose vars, types, etc.
	 are being merged into the current function.
	 See expand_inline_function.  */
      if (context == current_function_decl || context == inline_function_decl)
	context = 0;

      /* If this is non-local, handle it.  */
      if (context)
	{
	  temp = SAVE_EXPR_RTL (exp);
	  if (temp && GET_CODE (temp) == REG)
	    {
	      put_var_into_stack (exp);
	      temp = SAVE_EXPR_RTL (exp);
	    }
	  if (temp == 0 || GET_CODE (temp) != MEM)
	    abort ();
	  return change_address (temp, mode,
				 fix_lexical_addr (XEXP (temp, 0), exp));
	}
      if (SAVE_EXPR_RTL (exp) == 0)
	{
	  if (mode == BLKmode)
	    temp
	      = assign_stack_temp (mode,
				   int_size_in_bytes (TREE_TYPE (exp)), 0);
	  else
	    temp = gen_reg_rtx (mode);
	  SAVE_EXPR_RTL (exp) = temp;
	  store_expr (TREE_OPERAND (exp, 0), temp, 0);
	  if (!optimize && GET_CODE (temp) == REG)
	    save_expr_regs = gen_rtx (EXPR_LIST, VOIDmode, temp,
				      save_expr_regs);
	}
      return SAVE_EXPR_RTL (exp);

    case EXIT_EXPR:
      /* Exit the current loop if the body-expression is true.  */
      {
	rtx label = gen_label_rtx ();
	do_jump (TREE_OPERAND (exp, 0), label, NULL_RTX);
	expand_exit_loop (NULL_PTR);
	emit_label (label);
      }
      return const0_rtx;

    case LOOP_EXPR:
      expand_start_loop (1);
      expand_expr_stmt (TREE_OPERAND (exp, 0));
      expand_end_loop ();

      return const0_rtx;

    case BIND_EXPR:
      {
	tree vars = TREE_OPERAND (exp, 0);
	int vars_need_expansion = 0;

	/* Need to open a binding contour here because
	   if there are any cleanups they most be contained here.  */
	expand_start_bindings (0);

	/* Mark the corresponding BLOCK for output.  */
	if (TREE_OPERAND (exp, 2) != 0)
	  TREE_USED (TREE_OPERAND (exp, 2)) = 1;

	/* If VARS have not yet been expanded, expand them now.  */
	while (vars)
	  {
	    if (DECL_RTL (vars) == 0)
	      {
		vars_need_expansion = 1;
		expand_decl (vars);
	      }
	    expand_decl_init (vars);
	    vars = TREE_CHAIN (vars);
	  }

	temp = expand_expr (TREE_OPERAND (exp, 1), target, tmode, modifier);

	expand_end_bindings (TREE_OPERAND (exp, 0), 0, 0);

	return temp;
      }

    case RTL_EXPR:
      if (RTL_EXPR_SEQUENCE (exp) == const0_rtx)
	abort ();
      emit_insns (RTL_EXPR_SEQUENCE (exp));
      RTL_EXPR_SEQUENCE (exp) = const0_rtx;
      return RTL_EXPR_RTL (exp);

    case CONSTRUCTOR:
      /* All elts simple constants => refer to a constant in memory.  But
	 if this is a non-BLKmode mode, let it store a field at a time
	 since that should make a CONST_INT or CONST_DOUBLE when we
	 fold.  */
      if (TREE_STATIC (exp) && (mode == BLKmode || TREE_ADDRESSABLE (exp)))
	{
	  rtx constructor = output_constant_def (exp);
	  if (modifier != EXPAND_CONST_ADDRESS
	      && modifier != EXPAND_INITIALIZER
	      && modifier != EXPAND_SUM
	      && !memory_address_p (GET_MODE (constructor),
				    XEXP (constructor, 0)))
	    constructor = change_address (constructor, VOIDmode,
					  XEXP (constructor, 0));
	  return constructor;
	}

      if (ignore)
	{
	  tree elt;
	  for (elt = CONSTRUCTOR_ELTS (exp); elt; elt = TREE_CHAIN (elt))
	    expand_expr (TREE_VALUE (elt), const0_rtx, VOIDmode, 0);
	  return const0_rtx;
	}
      else
	{
	  if (target == 0 || ! safe_from_p (target, exp))
	    {
	      if (mode != BLKmode && ! TREE_ADDRESSABLE (exp))
		target = gen_reg_rtx (mode);
	      else
		{
		  rtx safe_target = assign_stack_temp (mode, int_size_in_bytes (type), 0);
		  if (target)
		    MEM_IN_STRUCT_P (safe_target) = MEM_IN_STRUCT_P (target);
		  target = safe_target;
		}
	    }
	  store_constructor (exp, target);
	  return target;
	}

    case INDIRECT_REF:
      {
	tree exp1 = TREE_OPERAND (exp, 0);
	tree exp2;

	/* A SAVE_EXPR as the address in an INDIRECT_EXPR is generated
	   for  *PTR += ANYTHING  where PTR is put inside the SAVE_EXPR.
	   This code has the same general effect as simply doing
	   expand_expr on the save expr, except that the expression PTR
	   is computed for use as a memory address.  This means different
	   code, suitable for indexing, may be generated.  */
	if (TREE_CODE (exp1) == SAVE_EXPR
	    && SAVE_EXPR_RTL (exp1) == 0
	    && TREE_CODE (exp2 = TREE_OPERAND (exp1, 0)) != ERROR_MARK
	    && TYPE_MODE (TREE_TYPE (exp1)) == Pmode
	    && TYPE_MODE (TREE_TYPE (exp2)) == Pmode)
	  {
	    temp = expand_expr (TREE_OPERAND (exp1, 0), NULL_RTX,
				VOIDmode, EXPAND_SUM);
	    op0 = memory_address (mode, temp);
	    op0 = copy_all_regs (op0);
	    SAVE_EXPR_RTL (exp1) = op0;
	  }
	else
	  {
	    op0 = expand_expr (exp1, NULL_RTX, VOIDmode, EXPAND_SUM);
	    op0 = memory_address (mode, op0);
	  }

	temp = gen_rtx (MEM, mode, op0);
	/* If address was computed by addition,
	   mark this as an element of an aggregate.  */
	if (TREE_CODE (TREE_OPERAND (exp, 0)) == PLUS_EXPR
	    || (TREE_CODE (TREE_OPERAND (exp, 0)) == SAVE_EXPR
		&& TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) == PLUS_EXPR)
	    || TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE
	    || TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
	    || TREE_CODE (TREE_TYPE (exp)) == UNION_TYPE
	    || (TREE_CODE (exp1) == ADDR_EXPR
		&& (exp2 = TREE_OPERAND (exp1, 0))
		&& (TREE_CODE (TREE_TYPE (exp2)) == ARRAY_TYPE
		    || TREE_CODE (TREE_TYPE (exp2)) == RECORD_TYPE
		    || TREE_CODE (TREE_TYPE (exp2)) == UNION_TYPE)))
	  MEM_IN_STRUCT_P (temp) = 1;
	MEM_VOLATILE_P (temp) = TREE_THIS_VOLATILE (exp) || flag_volatile;
#if 0 /* It is incorrectto set RTX_UNCHANGING_P here, because the fact that
	 a location is accessed through a pointer to const does not mean
	 that the value there can never change.  */
	RTX_UNCHANGING_P (temp) = TREE_READONLY (exp);
#endif
	return temp;
      }

    case ARRAY_REF:
      if (TREE_CODE (TREE_OPERAND (exp, 1)) != INTEGER_CST
	  || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
	{
	  /* Nonconstant array index or nonconstant element size.
	     Generate the tree for *(&array+index) and expand that,
	     except do it in a language-independent way
	     and don't complain about non-lvalue arrays.
	     `mark_addressable' should already have been called
	     for any array for which this case will be reached.  */

	  /* Don't forget the const or volatile flag from the array element. */
	  tree variant_type = build_type_variant (type,
						  TREE_READONLY (exp),
						  TREE_THIS_VOLATILE (exp));
	  tree array_adr = build1 (ADDR_EXPR, build_pointer_type (variant_type),
				   TREE_OPERAND (exp, 0));
	  tree index = TREE_OPERAND (exp, 1);
	  tree elt;

	  /* Convert the integer argument to a type the same size as a pointer
	     so the multiply won't overflow spuriously.  */
	  if (TYPE_PRECISION (TREE_TYPE (index)) != POINTER_SIZE)
	    index = convert (type_for_size (POINTER_SIZE, 0), index);

	  /* Don't think the address has side effects
	     just because the array does.
	     (In some cases the address might have side effects,
	     and we fail to record that fact here.  However, it should not
	     matter, since expand_expr should not care.)  */
	  TREE_SIDE_EFFECTS (array_adr) = 0;

	  elt = build1 (INDIRECT_REF, type,
			fold (build (PLUS_EXPR, TYPE_POINTER_TO (variant_type),
				     array_adr,
				     fold (build (MULT_EXPR,
						  TYPE_POINTER_TO (variant_type),
						  index, size_in_bytes (type))))));

	  /* Volatility, etc., of new expression is same as old expression.  */
	  TREE_SIDE_EFFECTS (elt) = TREE_SIDE_EFFECTS (exp);
	  TREE_THIS_VOLATILE (elt) = TREE_THIS_VOLATILE (exp);
	  TREE_READONLY (elt) = TREE_READONLY (exp);

	  return expand_expr (elt, target, tmode, modifier);
	}

      /* Fold an expression like: "foo"[2].
	 This is not done in fold so it won't happen inside &.  */
      {
	int i;
	tree arg0 = TREE_OPERAND (exp, 0);
	tree arg1 = TREE_OPERAND (exp, 1);

	if (TREE_CODE (arg0) == STRING_CST
	    && TREE_CODE (arg1) == INTEGER_CST
	    && !TREE_INT_CST_HIGH (arg1)
	    && (i = TREE_INT_CST_LOW (arg1)) < TREE_STRING_LENGTH (arg0))
	  {
	    if (TREE_TYPE (TREE_TYPE (arg0)) == integer_type_node)
	      {
		exp = build_int_2 (((int *)TREE_STRING_POINTER (arg0))[i], 0);
		TREE_TYPE (exp) = integer_type_node;
		return expand_expr (exp, target, tmode, modifier);
	      }
	    if (TREE_TYPE (TREE_TYPE (arg0)) == char_type_node)
	      {
		exp = build_int_2 (TREE_STRING_POINTER (arg0)[i], 0);
		TREE_TYPE (exp) = integer_type_node;
		return expand_expr (convert (TREE_TYPE (TREE_TYPE (arg0)), exp), target, tmode, modifier);
	      }
	  }
      }

      /* If this is a constant index into a constant array,
	 just get the value from the array.  Handle both the cases when
	 we have an explicit constructor and when our operand is a variable
	 that was declared const.  */

      if (TREE_CODE (TREE_OPERAND (exp, 0)) == CONSTRUCTOR
	  && ! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0)))
	{
	  tree index = fold (TREE_OPERAND (exp, 1));
	  if (TREE_CODE (index) == INTEGER_CST
	      && TREE_INT_CST_HIGH (index) == 0)
	    {
	      int i = TREE_INT_CST_LOW (index);
	      tree elem = CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0));

	      while (elem && i--)
		elem = TREE_CHAIN (elem);
	      if (elem)
		return expand_expr (fold (TREE_VALUE (elem)), target,
				    tmode, modifier);
	    }
	}
	  
      else if (TREE_READONLY (TREE_OPERAND (exp, 0))
	       && ! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0))
	       && TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == ARRAY_TYPE
	       && TREE_CODE (TREE_OPERAND (exp, 0)) == VAR_DECL
	       && DECL_INITIAL (TREE_OPERAND (exp, 0))
	       && optimize >= 1
	       && (TREE_CODE (DECL_INITIAL (TREE_OPERAND (exp, 0)))
		   != ERROR_MARK))
	{
	  tree index = fold (TREE_OPERAND (exp, 1));
	  if (TREE_CODE (index) == INTEGER_CST
	      && TREE_INT_CST_HIGH (index) == 0)
	    {
	      int i = TREE_INT_CST_LOW (index);
	      tree init = DECL_INITIAL (TREE_OPERAND (exp, 0));

	      if (TREE_CODE (init) == CONSTRUCTOR)
		{
		  tree elem = CONSTRUCTOR_ELTS (init);

		  while (elem && i--)
		    elem = TREE_CHAIN (elem);
		  if (elem)
		    return expand_expr (fold (TREE_VALUE (elem)), target,
					tmode, modifier);
		}
	      else if (TREE_CODE (init) == STRING_CST
		       && i < TREE_STRING_LENGTH (init))
		{
		  temp = GEN_INT (TREE_STRING_POINTER (init)[i]);
		  return convert_to_mode (mode, temp, 0);
		}
	    }
	}
      /* Treat array-ref with constant index as a component-ref.  */

    case COMPONENT_REF:
    case BIT_FIELD_REF:
      /* If the operand is a CONSTRUCTOR, we can just extract the
	 appropriate field if it is present.  */
      if (code != ARRAY_REF
	  && TREE_CODE (TREE_OPERAND (exp, 0)) == CONSTRUCTOR)
	{
	  tree elt;

	  for (elt = CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0)); elt;
	       elt = TREE_CHAIN (elt))
	    if (TREE_PURPOSE (elt) == TREE_OPERAND (exp, 1))
	      return expand_expr (TREE_VALUE (elt), target, tmode, modifier);
	}

      {
	enum machine_mode mode1;
	int bitsize;
	int bitpos;
	tree offset;
	int volatilep = 0;
	tree tem = get_inner_reference (exp, &bitsize, &bitpos, &offset,
					&mode1, &unsignedp, &volatilep);

	/* In some cases, we will be offsetting OP0's address by a constant.
	   So get it as a sum, if possible.  If we will be using it
	   directly in an insn, we validate it.  */
	op0 = expand_expr (tem, NULL_RTX, VOIDmode, EXPAND_SUM);

	/* If this is a constant, put it into a register if it is a
	   legimate constant and memory if it isn't.  */
	if (CONSTANT_P (op0))
	  {
	    enum machine_mode mode = TYPE_MODE (TREE_TYPE (tem));
	    if (LEGITIMATE_CONSTANT_P (op0))
	      op0 = force_reg (mode, op0);
	    else
	      op0 = validize_mem (force_const_mem (mode, op0));
	  }

	if (offset != 0)
	  {
	    rtx offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, 0);

	    if (GET_CODE (op0) != MEM)
	      abort ();
	    op0 = change_address (op0, VOIDmode,
				  gen_rtx (PLUS, Pmode, XEXP (op0, 0),
					   force_reg (Pmode, offset_rtx)));
	  }

	/* Don't forget about volatility even if this is a bitfield.  */
	if (GET_CODE (op0) == MEM && volatilep && ! MEM_VOLATILE_P (op0))
	  {
	    op0 = copy_rtx (op0);
	    MEM_VOLATILE_P (op0) = 1;
	  }

	if (mode1 == VOIDmode
	    || (mode1 != BLKmode && ! direct_load[(int) mode1])
	    || GET_CODE (op0) == REG || GET_CODE (op0) == SUBREG)
	  {
	    /* In cases where an aligned union has an unaligned object
	       as a field, we might be extracting a BLKmode value from
	       an integer-mode (e.g., SImode) object.  Handle this case
	       by doing the extract into an object as wide as the field
	       (which we know to be the width of a basic mode), then
	       storing into memory, and changing the mode to BLKmode.  */
	    enum machine_mode ext_mode = mode;

	    if (ext_mode == BLKmode)
	      ext_mode = mode_for_size (bitsize, MODE_INT, 1);

	    if (ext_mode == BLKmode)
	      abort ();

	    op0 = extract_bit_field (validize_mem (op0), bitsize, bitpos,
				     unsignedp, target, ext_mode, ext_mode,
				     TYPE_ALIGN (TREE_TYPE (tem)) / BITS_PER_UNIT,
				     int_size_in_bytes (TREE_TYPE (tem)));
	    if (mode == BLKmode)
	      {
		rtx new = assign_stack_temp (ext_mode,
					     bitsize / BITS_PER_UNIT, 0);

		emit_move_insn (new, op0);
		op0 = copy_rtx (new);
		PUT_MODE (op0, BLKmode);
	      }

	    return op0;
	  }

	/* Get a reference to just this component.  */
	if (modifier == EXPAND_CONST_ADDRESS
	    || modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
	  op0 = gen_rtx (MEM, mode1, plus_constant (XEXP (op0, 0),
						    (bitpos / BITS_PER_UNIT)));
	else
	  op0 = change_address (op0, mode1,
				plus_constant (XEXP (op0, 0),
					       (bitpos / BITS_PER_UNIT)));
	MEM_IN_STRUCT_P (op0) = 1;
	MEM_VOLATILE_P (op0) |= volatilep;
	if (mode == mode1 || mode1 == BLKmode || mode1 == tmode)
	  return op0;
	if (target == 0)
	  target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
	convert_move (target, op0, unsignedp);
	return target;
      }

    case OFFSET_REF:
      {
	tree base = build_unary_op (ADDR_EXPR, TREE_OPERAND (exp, 0), 0);
	tree addr = build (PLUS_EXPR, type, base, TREE_OPERAND (exp, 1));
	op0 = expand_expr (addr, NULL_RTX, VOIDmode, EXPAND_SUM);
	temp = gen_rtx (MEM, mode, memory_address (mode, op0));
	MEM_IN_STRUCT_P (temp) = 1;
	MEM_VOLATILE_P (temp) = TREE_THIS_VOLATILE (exp) || flag_volatile;
#if 0 /* It is incorrectto set RTX_UNCHANGING_P here, because the fact that
	 a location is accessed through a pointer to const does not mean
	 that the value there can never change.  */
	RTX_UNCHANGING_P (temp) = TREE_READONLY (exp);
#endif
	return temp;
      }

      /* Intended for a reference to a buffer of a file-object in Pascal.
	 But it's not certain that a special tree code will really be
	 necessary for these.  INDIRECT_REF might work for them.  */
    case BUFFER_REF:
      abort ();

    case WITH_CLEANUP_EXPR:
      if (RTL_EXPR_RTL (exp) == 0)
	{
	  RTL_EXPR_RTL (exp)
	    = expand_expr (TREE_OPERAND (exp, 0), target, tmode, modifier);
	  cleanups_this_call
	    = tree_cons (NULL_TREE, TREE_OPERAND (exp, 2), cleanups_this_call);
	  /* That's it for this cleanup.  */
	  TREE_OPERAND (exp, 2) = 0;
	}
      return RTL_EXPR_RTL (exp);

    case CALL_EXPR:
      /* Check for a built-in function.  */
      if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
	  && TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) == FUNCTION_DECL
	  && DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
	return expand_builtin (exp, target, subtarget, tmode, ignore);
      /* If this call was expanded already by preexpand_calls,
	 just return the result we got.  */
      if (CALL_EXPR_RTL (exp) != 0)
	return CALL_EXPR_RTL (exp);
      return expand_call (exp, target, ignore);

    case NON_LVALUE_EXPR:
    case NOP_EXPR:
    case CONVERT_EXPR:
    case REFERENCE_EXPR:
      if (TREE_CODE (type) == VOID_TYPE || ignore)
	{
	  expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, modifier);
	  return const0_rtx;
	}
      if (mode == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))
	return expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode, modifier);
      if (TREE_CODE (type) == UNION_TYPE)
	{
	  tree valtype = TREE_TYPE (TREE_OPERAND (exp, 0));
	  if (target == 0)
	    {
	      if (mode == BLKmode)
		{
		  if (TYPE_SIZE (type) == 0
		      || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
		    abort ();
		  target = assign_stack_temp (BLKmode,
					      (TREE_INT_CST_LOW (TYPE_SIZE (type))
					       + BITS_PER_UNIT - 1)
					      / BITS_PER_UNIT, 0);
		}
	      else
		target = gen_reg_rtx (mode);
	    }
	  if (GET_CODE (target) == MEM)
	    /* Store data into beginning of memory target.  */
	    store_expr (TREE_OPERAND (exp, 0),
			change_address (target, TYPE_MODE (valtype), 0),
			NULL_RTX);
	  else if (GET_CODE (target) == REG)
	    /* Store this field into a union of the proper type.  */
	    store_field (target, GET_MODE_BITSIZE (TYPE_MODE (valtype)), 0,
			 TYPE_MODE (valtype), TREE_OPERAND (exp, 0),
			 VOIDmode, 0, 1,
			 int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0))));
	  else
	    abort ();

	  /* Return the entire union.  */
	  return target;
	}
      op0 = expand_expr (TREE_OPERAND (exp, 0), 0, mode, modifier);
      if (GET_MODE (op0) == mode || GET_MODE (op0) == VOIDmode)
	return op0;
      if (modifier == EXPAND_INITIALIZER)
	return gen_rtx (unsignedp ? ZERO_EXTEND : SIGN_EXTEND, mode, op0);
      if (flag_force_mem && GET_CODE (op0) == MEM)
	op0 = copy_to_reg (op0);

      if (target == 0)
	return convert_to_mode (mode, op0, TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
      else
	convert_move (target, op0, TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
      return target;

    case PLUS_EXPR:
      /* We come here from MINUS_EXPR when the second operand is a constant. */
    plus_expr:
      this_optab = add_optab;

      /* If we are adding a constant, an RTL_EXPR that is sp, fp, or ap, and
	 something else, make sure we add the register to the constant and
	 then to the other thing.  This case can occur during strength
	 reduction and doing it this way will produce better code if the
	 frame pointer or argument pointer is eliminated.

	 fold-const.c will ensure that the constant is always in the inner
	 PLUS_EXPR, so the only case we need to do anything about is if
	 sp, ap, or fp is our second argument, in which case we must swap
	 the innermost first argument and our second argument.  */

      if (TREE_CODE (TREE_OPERAND (exp, 0)) == PLUS_EXPR
	  && TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 1)) == INTEGER_CST
	  && TREE_CODE (TREE_OPERAND (exp, 1)) == RTL_EXPR
	  && (RTL_EXPR_RTL (TREE_OPERAND (exp, 1)) == frame_pointer_rtx
	      || RTL_EXPR_RTL (TREE_OPERAND (exp, 1)) == stack_pointer_rtx
	      || RTL_EXPR_RTL (TREE_OPERAND (exp, 1)) == arg_pointer_rtx))
	{
	  tree t = TREE_OPERAND (exp, 1);

	  TREE_OPERAND (exp, 1) = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
	  TREE_OPERAND (TREE_OPERAND (exp, 0), 0) = t;
	}

      /* If the result is to be Pmode and we are adding an integer to
	 something, we might be forming a constant.  So try to use
	 plus_constant.  If it produces a sum and we can't accept it,
	 use force_operand.  This allows P = &ARR[const] to generate
	 efficient code on machines where a SYMBOL_REF is not a valid
	 address.

	 If this is an EXPAND_SUM call, always return the sum.  */
      if (TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST
	  && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
	  && (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER
	      || mode == Pmode))
	{
	  op1 = expand_expr (TREE_OPERAND (exp, 1), subtarget, VOIDmode,
			     EXPAND_SUM);
	  op1 = plus_constant (op1, TREE_INT_CST_LOW (TREE_OPERAND (exp, 0)));
	  if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
	    op1 = force_operand (op1, target);
	  return op1;
	}

      else if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
	       && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_INT
	       && (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER
		   || mode == Pmode))
	{
	  op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode,
			     EXPAND_SUM);
	  op0 = plus_constant (op0, TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)));
	  if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
	    op0 = force_operand (op0, target);
	  return op0;
	}

      /* No sense saving up arithmetic to be done
	 if it's all in the wrong mode to form part of an address.
	 And force_operand won't know whether to sign-extend or
	 zero-extend.  */
      if ((modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
	  || mode != Pmode) goto binop;

      preexpand_calls (exp);
      if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1)))
	subtarget = 0;

      op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, modifier);
      op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, modifier);

      /* Make sure any term that's a sum with a constant comes last.  */
      if (GET_CODE (op0) == PLUS
	  && CONSTANT_P (XEXP (op0, 1)))
	{
	  temp = op0;
	  op0 = op1;
	  op1 = temp;
	}
      /* If adding to a sum including a constant,
	 associate it to put the constant outside.  */
      if (GET_CODE (op1) == PLUS
	  && CONSTANT_P (XEXP (op1, 1)))
	{
	  rtx constant_term = const0_rtx;

	  temp = simplify_binary_operation (PLUS, mode, XEXP (op1, 0), op0);
	  if (temp != 0)
	    op0 = temp;
	  /* Ensure that MULT comes first if there is one.  */
	  else if (GET_CODE (op0) == MULT)
	    op0 = gen_rtx (PLUS, mode, op0, XEXP (op1, 0));
	  else
	    op0 = gen_rtx (PLUS, mode, XEXP (op1, 0), op0);

	  /* Let's also eliminate constants from op0 if possible.  */
	  op0 = eliminate_constant_term (op0, &constant_term);

	  /* CONSTANT_TERM and XEXP (op1, 1) are known to be constant, so
	     their sum should be a constant.  Form it into OP1, since the 
	     result we want will then be OP0 + OP1.  */

	  temp = simplify_binary_operation (PLUS, mode, constant_term,
					    XEXP (op1, 1));
	  if (temp != 0)
	    op1 = temp;
	  else
	    op1 = gen_rtx (PLUS, mode, constant_term, XEXP (op1, 1));
	}

      /* Put a constant term last and put a multiplication first.  */
      if (CONSTANT_P (op0) || GET_CODE (op1) == MULT)
	temp = op1, op1 = op0, op0 = temp;

      temp = simplify_binary_operation (PLUS, mode, op0, op1);
      return temp ? temp : gen_rtx (PLUS, mode, op0, op1);

    case MINUS_EXPR:
      /* Handle difference of two symbolic constants,
	 for the sake of an initializer.  */
      if ((modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
	  && really_constant_p (TREE_OPERAND (exp, 0))
	  && really_constant_p (TREE_OPERAND (exp, 1)))
	{
	  rtx op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX,
				 VOIDmode, modifier);
	  rtx op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX,
				 VOIDmode, modifier);
	  return gen_rtx (MINUS, mode, op0, op1);
	}
      /* Convert A - const to A + (-const).  */
      if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST)
	{
	  exp = build (PLUS_EXPR, type, TREE_OPERAND (exp, 0),
		       fold (build1 (NEGATE_EXPR, type,
				     TREE_OPERAND (exp, 1))));
	  goto plus_expr;
	}
      this_optab = sub_optab;
      goto binop;

    case MULT_EXPR:
      preexpand_calls (exp);
      /* If first operand is constant, swap them.
	 Thus the following special case checks need only
	 check the second operand.  */
      if (TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST)
	{
	  register tree t1 = TREE_OPERAND (exp, 0);
	  TREE_OPERAND (exp, 0) = TREE_OPERAND (exp, 1);
	  TREE_OPERAND (exp, 1) = t1;
	}

      /* Attempt to return something suitable for generating an
	 indexed address, for machines that support that.  */

      if (modifier == EXPAND_SUM && mode == Pmode
	  && TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
	  && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
	{
	  op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, EXPAND_SUM);

	  /* Apply distributive law if OP0 is x+c.  */
	  if (GET_CODE (op0) == PLUS
	      && GET_CODE (XEXP (op0, 1)) == CONST_INT)
	    return gen_rtx (PLUS, mode,
			    gen_rtx (MULT, mode, XEXP (op0, 0),
				     GEN_INT (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)))),
			    GEN_INT (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1))
				     * INTVAL (XEXP (op0, 1))));

	  if (GET_CODE (op0) != REG)
	    op0 = force_operand (op0, NULL_RTX);
	  if (GET_CODE (op0) != REG)
	    op0 = copy_to_mode_reg (mode, op0);

	  return gen_rtx (MULT, mode, op0,
			  GEN_INT (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1))));
	}

      if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1)))
	subtarget = 0;

      /* Check for multiplying things that have been extended
	 from a narrower type.  If this machine supports multiplying
	 in that narrower type with a result in the desired type,
	 do it that way, and avoid the explicit type-conversion.  */
      if (TREE_CODE (TREE_OPERAND (exp, 0)) == NOP_EXPR
	  && TREE_CODE (type) == INTEGER_TYPE
	  && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
	      < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp, 0))))
	  && ((TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
	       && int_fits_type_p (TREE_OPERAND (exp, 1),
				   TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
	       /* Don't use a widening multiply if a shift will do.  */
	       && ((GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 1))))
		    > HOST_BITS_PER_WIDE_INT)
		   || exact_log2 (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1))) < 0))
	      ||
	      (TREE_CODE (TREE_OPERAND (exp, 1)) == NOP_EXPR
	       && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 1), 0)))
		   ==
		   TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))))
	       /* If both operands are extended, they must either both
		  be zero-extended or both be sign-extended.  */
	       && (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 1), 0)))
		   ==
		   TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))))))
	{
	  enum machine_mode innermode
	    = TYPE_MODE (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)));
	  this_optab = (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
			? umul_widen_optab : smul_widen_optab);
	  if (mode == GET_MODE_WIDER_MODE (innermode)
	      && this_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing)
	    {
	      op0 = expand_expr (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
				 NULL_RTX, VOIDmode, 0);
	      if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST)
		op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX,
				   VOIDmode, 0);
	      else
		op1 = expand_expr (TREE_OPERAND (TREE_OPERAND (exp, 1), 0),
				   NULL_RTX, VOIDmode, 0);
	      goto binop2;
	    }
	}
      op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
      op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
      return expand_mult (mode, op0, op1, target, unsignedp);

    case TRUNC_DIV_EXPR:
    case FLOOR_DIV_EXPR:
    case CEIL_DIV_EXPR:
    case ROUND_DIV_EXPR:
    case EXACT_DIV_EXPR:
      preexpand_calls (exp);
      if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1)))
	subtarget = 0;
      /* Possible optimization: compute the dividend with EXPAND_SUM
	 then if the divisor is constant can optimize the case
	 where some terms of the dividend have coeffs divisible by it.  */
      op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
      op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
      return expand_divmod (0, code, mode, op0, op1, target, unsignedp);

    case RDIV_EXPR:
      this_optab = flodiv_optab;
      goto binop;

    case TRUNC_MOD_EXPR:
    case FLOOR_MOD_EXPR:
    case CEIL_MOD_EXPR:
    case ROUND_MOD_EXPR:
      preexpand_calls (exp);
      if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1)))
	subtarget = 0;
      op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
      op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
      return expand_divmod (1, code, mode, op0, op1, target, unsignedp);

    case FIX_ROUND_EXPR:
    case FIX_FLOOR_EXPR:
    case FIX_CEIL_EXPR:
      abort ();			/* Not used for C.  */

    case FIX_TRUNC_EXPR:
      op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
      if (target == 0)
	target = gen_reg_rtx (mode);
      expand_fix (target, op0, unsignedp);
      return target;

    case FLOAT_EXPR:
      op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
      if (target == 0)
	target = gen_reg_rtx (mode);
      /* expand_float can't figure out what to do if FROM has VOIDmode.
	 So give it the correct mode.  With -O, cse will optimize this.  */
      if (GET_MODE (op0) == VOIDmode)
	op0 = copy_to_mode_reg (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))),
				op0);
      expand_float (target, op0,
		    TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
      return target;

    case NEGATE_EXPR:
      op0 = expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode, 0);
      temp = expand_unop (mode, neg_optab, op0, target, 0);
      if (temp == 0)
	abort ();
      return temp;

    case ABS_EXPR:
      op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);

      /* Unsigned abs is simply the operand.  Testing here means we don't
	 risk generating incorrect code below.  */
      if (TREE_UNSIGNED (type))
	return op0;

      /* First try to do it with a special abs instruction.  */
      temp = expand_unop (mode, abs_optab, op0, target, 0);
      if (temp != 0)
	return temp;

      /* If this machine has expensive jumps, we can do integer absolute
	 value of X as (((signed) x >> (W-1)) ^ x) - ((signed) x >> (W-1)),
	 where W is the width of MODE.  */

      if (GET_MODE_CLASS (mode) == MODE_INT && BRANCH_COST >= 2)
	{
	  rtx extended = expand_shift (RSHIFT_EXPR, mode, op0,
				       size_int (GET_MODE_BITSIZE (mode) - 1),
				       NULL_RTX, 0);

	  temp = expand_binop (mode, xor_optab, extended, op0, target, 0,
			       OPTAB_LIB_WIDEN);
	  if (temp != 0)
	    temp = expand_binop (mode, sub_optab, temp, extended, target, 0,
				 OPTAB_LIB_WIDEN);

	  if (temp != 0)
	    return temp;
	}

      /* If that does not win, use conditional jump and negate.  */
      target = original_target;
      temp = gen_label_rtx ();
      if (target == 0 || ! safe_from_p (target, TREE_OPERAND (exp, 0))
	  || (GET_CODE (target) == REG
	      && REGNO (target) < FIRST_PSEUDO_REGISTER))
	target = gen_reg_rtx (mode);
      emit_move_insn (target, op0);
      emit_cmp_insn (target,
		     expand_expr (convert (type, integer_zero_node),
				  NULL_RTX, VOIDmode, 0),
		     GE, NULL_RTX, mode, 0, 0);
      NO_DEFER_POP;
      emit_jump_insn (gen_bge (temp));
      op0 = expand_unop (mode, neg_optab, target, target, 0);
      if (op0 != target)
	emit_move_insn (target, op0);
      emit_label (temp);
      OK_DEFER_POP;
      return target;

    case MAX_EXPR:
    case MIN_EXPR:
      target = original_target;
      if (target == 0 || ! safe_from_p (target, TREE_OPERAND (exp, 1))
	  || (GET_CODE (target) == REG
	      && REGNO (target) < FIRST_PSEUDO_REGISTER))
	target = gen_reg_rtx (mode);
      op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
      op0 = expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode, 0);

      /* First try to do it with a special MIN or MAX instruction.
	 If that does not win, use a conditional jump to select the proper
	 value.  */
      this_optab = (TREE_UNSIGNED (type)
		    ? (code == MIN_EXPR ? umin_optab : umax_optab)
		    : (code == MIN_EXPR ? smin_optab : smax_optab));

      temp = expand_binop (mode, this_optab, op0, op1, target, unsignedp,
			   OPTAB_WIDEN);
      if (temp != 0)
	return temp;

      if (target != op0)
	emit_move_insn (target, op0);
      op0 = gen_label_rtx ();
      if (code == MAX_EXPR)
	temp = (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 1)))
		? compare_from_rtx (target, op1, GEU, 1, mode, NULL_RTX, 0)
		: compare_from_rtx (target, op1, GE, 0, mode, NULL_RTX, 0));
      else
	temp = (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 1)))
		? compare_from_rtx (target, op1, LEU, 1, mode, NULL_RTX, 0)
		: compare_from_rtx (target, op1, LE, 0, mode, NULL_RTX, 0));
      if (temp == const0_rtx)
	emit_move_insn (target, op1);
      else if (temp != const_true_rtx)
	{
	  if (bcc_gen_fctn[(int) GET_CODE (temp)] != 0)
	    emit_jump_insn ((*bcc_gen_fctn[(int) GET_CODE (temp)]) (op0));
	  else
	    abort ();
	  emit_move_insn (target, op1);
	}
      emit_label (op0);
      return target;

/* ??? Can optimize when the operand of this is a bitwise operation,
   by using a different bitwise operation.  */
    case BIT_NOT_EXPR:
      op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
      temp = expand_unop (mode, one_cmpl_optab, op0, target, 1);
      if (temp == 0)
	abort ();
      return temp;

    case FFS_EXPR:
      op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
      temp = expand_unop (mode, ffs_optab, op0, target, 1);
      if (temp == 0)
	abort ();
      return temp;

/* ??? Can optimize bitwise operations with one arg constant.
   Can optimize (a bitwise1 n) bitwise2 (a bitwise3 b)
   and (a bitwise1 b) bitwise2 b (etc)
   but that is probably not worth while.  */

/* BIT_AND_EXPR is for bitwise anding.
   TRUTH_AND_EXPR is for anding two boolean values
   when we want in all cases to compute both of them.
   In general it is fastest to do TRUTH_AND_EXPR by
   computing both operands as actual zero-or-1 values
   and then bitwise anding.  In cases where there cannot
   be any side effects, better code would be made by
   treating TRUTH_AND_EXPR like TRUTH_ANDIF_EXPR;
   but the question is how to recognize those cases.  */

    case TRUTH_AND_EXPR:
    case BIT_AND_EXPR:
      this_optab = and_optab;
      goto binop;

/* See comment above about TRUTH_AND_EXPR; it applies here too.  */
    case TRUTH_OR_EXPR:
    case BIT_IOR_EXPR:
      this_optab = ior_optab;
      goto binop;

    case BIT_XOR_EXPR:
      this_optab = xor_optab;
      goto binop;

    case LSHIFT_EXPR:
    case RSHIFT_EXPR:
    case LROTATE_EXPR:
    case RROTATE_EXPR:
      preexpand_calls (exp);
      if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1)))
	subtarget = 0;
      op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
      return expand_shift (code, mode, op0, TREE_OPERAND (exp, 1), target,
			   unsignedp);

/* Could determine the answer when only additive constants differ.
   Also, the addition of one can be handled by changing the condition.  */
    case LT_EXPR:
    case LE_EXPR:
    case GT_EXPR:
    case GE_EXPR:
    case EQ_EXPR:
    case NE_EXPR:
      preexpand_calls (exp);
      temp = do_store_flag (exp, target, tmode != VOIDmode ? tmode : mode, 0);
      if (temp != 0)
	return temp;
      /* For foo != 0, load foo, and if it is nonzero load 1 instead. */
      if (code == NE_EXPR && integer_zerop (TREE_OPERAND (exp, 1))
	  && original_target
	  && GET_CODE (original_target) == REG
	  && (GET_MODE (original_target)
	      == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))))
	{
	  temp = expand_expr (TREE_OPERAND (exp, 0), original_target, VOIDmode, 0);
	  if (temp != original_target)
	    temp = copy_to_reg (temp);
	  op1 = gen_label_rtx ();
	  emit_cmp_insn (temp, const0_rtx, EQ, NULL_RTX,
			 GET_MODE (temp), unsignedp, 0);
	  emit_jump_insn (gen_beq (op1));
	  emit_move_insn (temp, const1_rtx);
	  emit_label (op1);
	  return temp;
	}
      /* If no set-flag instruction, must generate a conditional
	 store into a temporary variable.  Drop through
	 and handle this like && and ||.  */

    case TRUTH_ANDIF_EXPR:
    case TRUTH_ORIF_EXPR:
      if (target == 0 || ! safe_from_p (target, exp)
	  /* Make sure we don't have a hard reg (such as function's return
	     value) live across basic blocks, if not optimizing.  */
	  || (!optimize && GET_CODE (target) == REG
	      && REGNO (target) < FIRST_PSEUDO_REGISTER))
	target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
      emit_clr_insn (target);
      op1 = gen_label_rtx ();
      jumpifnot (exp, op1);
      emit_0_to_1_insn (target);
      emit_label (op1);
      return target;

    case TRUTH_NOT_EXPR:
      op0 = expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode, 0);
      /* The parser is careful to generate TRUTH_NOT_EXPR
	 only with operands that are always zero or one.  */
      temp = expand_binop (mode, xor_optab, op0, const1_rtx,
			   target, 1, OPTAB_LIB_WIDEN);
      if (temp == 0)
	abort ();
      return temp;

    case COMPOUND_EXPR:
      expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0);
      emit_queue ();
      return expand_expr (TREE_OPERAND (exp, 1),
			  (ignore ? const0_rtx : target),
			  VOIDmode, 0);

    case COND_EXPR:
      {
	/* Note that COND_EXPRs whose type is a structure or union
	   are required to be constructed to contain assignments of
	   a temporary variable, so that we can evaluate them here
	   for side effect only.  If type is void, we must do likewise.  */

	/* If an arm of the branch requires a cleanup,
	   only that cleanup is performed.  */

	tree singleton = 0;
	tree binary_op = 0, unary_op = 0;
	tree old_cleanups = cleanups_this_call;
	cleanups_this_call = 0;

	/* If this is (A ? 1 : 0) and A is a condition, just evaluate it and
	   convert it to our mode, if necessary.  */
	if (integer_onep (TREE_OPERAND (exp, 1))
	    && integer_zerop (TREE_OPERAND (exp, 2))
	    && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<')
	  {
	    op0 = expand_expr (TREE_OPERAND (exp, 0), target, mode, modifier);
	    if (GET_MODE (op0) == mode)
	      return op0;
	    if (target == 0)
	      target = gen_reg_rtx (mode);
	    convert_move (target, op0, unsignedp);
	    return target;
	  }

	/* If we are not to produce a result, we have no target.  Otherwise,
	   if a target was specified use it; it will not be used as an
	   intermediate target unless it is safe.  If no target, use a 
	   temporary.  */

	if (mode == VOIDmode || ignore)
	  temp = 0;
	else if (original_target
		 && safe_from_p (original_target, TREE_OPERAND (exp, 0)))
	  temp = original_target;
	else if (mode == BLKmode)
	  {
	    if (TYPE_SIZE (type) == 0
		|| TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
	      abort ();
	    temp = assign_stack_temp (BLKmode,
				      (TREE_INT_CST_LOW (TYPE_SIZE (type))
				       + BITS_PER_UNIT - 1)
				      / BITS_PER_UNIT, 0);
	  }
	else
	  temp = gen_reg_rtx (mode);

	/* Check for X ? A + B : A.  If we have this, we can copy
	   A to the output and conditionally add B.  Similarly for unary
	   operations.  Don't do this if X has side-effects because
	   those side effects might affect A or B and the "?" operation is
	   a sequence point in ANSI.  (We test for side effects later.)  */

	if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 1))) == '2'
	    && operand_equal_p (TREE_OPERAND (exp, 2),
				TREE_OPERAND (TREE_OPERAND (exp, 1), 0), 0))
	  singleton = TREE_OPERAND (exp, 2), binary_op = TREE_OPERAND (exp, 1);
	else if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 2))) == '2'
		 && operand_equal_p (TREE_OPERAND (exp, 1),
				     TREE_OPERAND (TREE_OPERAND (exp, 2), 0), 0))
	  singleton = TREE_OPERAND (exp, 1), binary_op = TREE_OPERAND (exp, 2);
	else if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 1))) == '1'
		 && operand_equal_p (TREE_OPERAND (exp, 2),
				     TREE_OPERAND (TREE_OPERAND (exp, 1), 0), 0))
	  singleton = TREE_OPERAND (exp, 2), unary_op = TREE_OPERAND (exp, 1);
	else if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 2))) == '1'
		 && operand_equal_p (TREE_OPERAND (exp, 1),
				     TREE_OPERAND (TREE_OPERAND (exp, 2), 0), 0))
	  singleton = TREE_OPERAND (exp, 1), unary_op = TREE_OPERAND (exp, 2);

	/* If we had X ? A + 1 : A and we can do the test of X as a store-flag
	   operation, do this as A + (X != 0).  Similarly for other simple
	   binary operators.  */
	if (singleton && binary_op
	    && ! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0))
	    && (TREE_CODE (binary_op) == PLUS_EXPR
		|| TREE_CODE (binary_op) == MINUS_EXPR
		|| TREE_CODE (binary_op) == BIT_IOR_EXPR
		|| TREE_CODE (binary_op) == BIT_XOR_EXPR
		|| TREE_CODE (binary_op) == BIT_AND_EXPR)
	    && integer_onep (TREE_OPERAND (binary_op, 1))
	    && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<')
	  {
	    rtx result;
	    optab boptab = (TREE_CODE (binary_op) == PLUS_EXPR ? add_optab
			    : TREE_CODE (binary_op) == MINUS_EXPR ? sub_optab
			    : TREE_CODE (binary_op) == BIT_IOR_EXPR ? ior_optab
			    : TREE_CODE (binary_op) == BIT_XOR_EXPR ? xor_optab
			    : and_optab);

	    /* If we had X ? A : A + 1, do this as A + (X == 0).

	       We have to invert the truth value here and then put it
	       back later if do_store_flag fails.  We cannot simply copy
	       TREE_OPERAND (exp, 0) to another variable and modify that
	       because invert_truthvalue can modify the tree pointed to
	       by its argument.  */
	    if (singleton == TREE_OPERAND (exp, 1))
	      TREE_OPERAND (exp, 0)
		= invert_truthvalue (TREE_OPERAND (exp, 0));

	    result = do_store_flag (TREE_OPERAND (exp, 0),
				    (safe_from_p (temp, singleton)
				     ? temp : NULL_RTX),
				    mode, BRANCH_COST <= 1);

	    if (result)
	      {
		op1 = expand_expr (singleton, NULL_RTX, VOIDmode, 0);
		return expand_binop (mode, boptab, op1, result, temp,
				     unsignedp, OPTAB_LIB_WIDEN);
	      }
	    else if (singleton == TREE_OPERAND (exp, 1))
	      TREE_OPERAND (exp, 0)
		= invert_truthvalue (TREE_OPERAND (exp, 0));
	  }
	    
	NO_DEFER_POP;
	op0 = gen_label_rtx ();

	if (singleton && ! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0)))
	  {
	    if (temp != 0)
	      {
		/* If the target conflicts with the other operand of the
		   binary op, we can't use it.  Also, we can't use the target
		   if it is a hard register, because evaluating the condition
		   might clobber it.  */
		if ((binary_op
		     && ! safe_from_p (temp, TREE_OPERAND (binary_op, 1)))
		    || (GET_CODE (temp) == REG
			&& REGNO (temp) < FIRST_PSEUDO_REGISTER))
		  temp = gen_reg_rtx (mode);
		store_expr (singleton, temp, 0);
	      }
	    else
	      expand_expr (singleton,
			   ignore ? const1_rtx : NULL_RTX, VOIDmode, 0);
	    if (cleanups_this_call)
	      {
		sorry ("aggregate value in COND_EXPR");
		cleanups_this_call = 0;
	      }
	    if (singleton == TREE_OPERAND (exp, 1))
	      jumpif (TREE_OPERAND (exp, 0), op0);
	    else
	      jumpifnot (TREE_OPERAND (exp, 0), op0);

	    if (binary_op && temp == 0)
	      /* Just touch the other operand.  */
	      expand_expr (TREE_OPERAND (binary_op, 1),
			   ignore ? const0_rtx : NULL_RTX, VOIDmode, 0);
	    else if (binary_op)
	      store_expr (build (TREE_CODE (binary_op), type,
				 make_tree (type, temp),
				 TREE_OPERAND (binary_op, 1)),
			  temp, 0);
	    else
	      store_expr (build1 (TREE_CODE (unary_op), type,
				  make_tree (type, temp)),
			  temp, 0);
	    op1 = op0;
	  }
#if 0
	/* This is now done in jump.c and is better done there because it
	   produces shorter register lifetimes.  */
	   
	/* Check for both possibilities either constants or variables
	   in registers (but not the same as the target!).  If so, can
	   save branches by assigning one, branching, and assigning the
	   other.  */
	else if (temp && GET_MODE (temp) != BLKmode
		 && (TREE_CONSTANT (TREE_OPERAND (exp, 1))
		     || ((TREE_CODE (TREE_OPERAND (exp, 1)) == PARM_DECL
			  || TREE_CODE (TREE_OPERAND (exp, 1)) == VAR_DECL)
			 && DECL_RTL (TREE_OPERAND (exp, 1))
			 && GET_CODE (DECL_RTL (TREE_OPERAND (exp, 1))) == REG
			 && DECL_RTL (TREE_OPERAND (exp, 1)) != temp))
		 && (TREE_CONSTANT (TREE_OPERAND (exp, 2))
		     || ((TREE_CODE (TREE_OPERAND (exp, 2)) == PARM_DECL
			  || TREE_CODE (TREE_OPERAND (exp, 2)) == VAR_DECL)
			 && DECL_RTL (TREE_OPERAND (exp, 2))
			 && GET_CODE (DECL_RTL (TREE_OPERAND (exp, 2))) == REG
			 && DECL_RTL (TREE_OPERAND (exp, 2)) != temp)))
	  {
	    if (GET_CODE (temp) == REG && REGNO (temp) < FIRST_PSEUDO_REGISTER)
	      temp = gen_reg_rtx (mode);
	    store_expr (TREE_OPERAND (exp, 2), temp, 0);
	    jumpifnot (TREE_OPERAND (exp, 0), op0);
	    store_expr (TREE_OPERAND (exp, 1), temp, 0);
	    op1 = op0;
	  }
#endif
	/* Check for A op 0 ? A : FOO and A op 0 ? FOO : A where OP is any
	   comparison operator.  If we have one of these cases, set the
	   output to A, branch on A (cse will merge these two references),
	   then set the output to FOO.  */
	else if (temp
		 && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<'
		 && integer_zerop (TREE_OPERAND (TREE_OPERAND (exp, 0), 1))
		 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
				     TREE_OPERAND (exp, 1), 0)
		 && ! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0))
		 && safe_from_p (temp, TREE_OPERAND (exp, 2)))
	  {
	    if (GET_CODE (temp) == REG && REGNO (temp) < FIRST_PSEUDO_REGISTER)
	      temp = gen_reg_rtx (mode);
	    store_expr (TREE_OPERAND (exp, 1), temp, 0);
	    jumpif (TREE_OPERAND (exp, 0), op0);
	    store_expr (TREE_OPERAND (exp, 2), temp, 0);
	    op1 = op0;
	  }
	else if (temp
		 && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<'
		 && integer_zerop (TREE_OPERAND (TREE_OPERAND (exp, 0), 1))
		 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
				     TREE_OPERAND (exp, 2), 0)
		 && ! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0))
		 && safe_from_p (temp, TREE_OPERAND (exp, 1)))
	  {
	    if (GET_CODE (temp) == REG && REGNO (temp) < FIRST_PSEUDO_REGISTER)
	      temp = gen_reg_rtx (mode);
	    store_expr (TREE_OPERAND (exp, 2), temp, 0);
	    jumpifnot (TREE_OPERAND (exp, 0), op0);
	    store_expr (TREE_OPERAND (exp, 1), temp, 0);
	    op1 = op0;
	  }
	else
	  {
	    op1 = gen_label_rtx ();
	    jumpifnot (TREE_OPERAND (exp, 0), op0);
	    if (temp != 0)
	      store_expr (TREE_OPERAND (exp, 1), temp, 0);
	    else
	      expand_expr (TREE_OPERAND (exp, 1),
			   ignore ? const0_rtx : NULL_RTX, VOIDmode, 0);
	    if (cleanups_this_call)
	      {
		sorry ("aggregate value in COND_EXPR");
		cleanups_this_call = 0;
	      }

	    emit_queue ();
	    emit_jump_insn (gen_jump (op1));
	    emit_barrier ();
	    emit_label (op0);
	    if (temp != 0)
	      store_expr (TREE_OPERAND (exp, 2), temp, 0);
	    else
	      expand_expr (TREE_OPERAND (exp, 2),
			   ignore ? const0_rtx : NULL_RTX, VOIDmode, 0);
	  }

	if (cleanups_this_call)
	  {
	    sorry ("aggregate value in COND_EXPR");
	    cleanups_this_call = 0;
	  }

	emit_queue ();
	emit_label (op1);
	OK_DEFER_POP;
	cleanups_this_call = old_cleanups;
	return temp;
      }

    case TARGET_EXPR:
      {
	/* Something needs to be initialized, but we didn't know
	   where that thing was when building the tree.  For example,
	   it could be the return value of a function, or a parameter
	   to a function which lays down in the stack, or a temporary
	   variable which must be passed by reference.

	   We guarantee that the expression will either be constructed
	   or copied into our original target.  */

	tree slot = TREE_OPERAND (exp, 0);

	if (TREE_CODE (slot) != VAR_DECL)
	  abort ();

	if (target == 0)
	  {
	    if (DECL_RTL (slot) != 0)
	      target = DECL_RTL (slot);
	    else
	      {
		target = assign_stack_temp (mode, int_size_in_bytes (type), 0);
		/* All temp slots at this level must not conflict.  */
		preserve_temp_slots (target);
		DECL_RTL (slot) = target;
	      }

#if 0
	    /* Since SLOT is not known to the called function
	       to belong to its stack frame, we must build an explicit
	       cleanup.  This case occurs when we must build up a reference
	       to pass the reference as an argument.  In this case,
	       it is very likely that such a reference need not be
	       built here.  */

	    if (TREE_OPERAND (exp, 2) == 0)
	      TREE_OPERAND (exp, 2) = maybe_build_cleanup (slot);
	    if (TREE_OPERAND (exp, 2))
	      cleanups_this_call = tree_cons (NULL_TREE, TREE_OPERAND (exp, 2),
					      cleanups_this_call);
#endif
	  }
	else
	  {
	    /* This case does occur, when expanding a parameter which
	       needs to be constructed on the stack.  The target
	       is the actual stack address that we want to initialize.
	       The function we call will perform the cleanup in this case.  */

	    DECL_RTL (slot) = target;
	  }

	return expand_expr (TREE_OPERAND (exp, 1), target, tmode, modifier);
      }

    case INIT_EXPR:
      {
	tree lhs = TREE_OPERAND (exp, 0);
	tree rhs = TREE_OPERAND (exp, 1);
	tree noncopied_parts = 0;
	tree lhs_type = TREE_TYPE (lhs);

	temp = expand_assignment (lhs, rhs, ! ignore, original_target != 0);
	if (TYPE_NONCOPIED_PARTS (lhs_type) != 0 && !fixed_type_p (rhs))
	  noncopied_parts = init_noncopied_parts (stabilize_reference (lhs),
						  TYPE_NONCOPIED_PARTS (lhs_type));
	while (noncopied_parts != 0)
	  {
	    expand_assignment (TREE_VALUE (noncopied_parts),
			       TREE_PURPOSE (noncopied_parts), 0, 0);
	    noncopied_parts = TREE_CHAIN (noncopied_parts);
	  }
	return temp;
      }

    case MODIFY_EXPR:
      {
	/* If lhs is complex, expand calls in rhs before computing it.
	   That's so we don't compute a pointer and save it over a call.
	   If lhs is simple, compute it first so we can give it as a
	   target if the rhs is just a call.  This avoids an extra temp and copy
	   and that prevents a partial-subsumption which makes bad code.
	   Actually we could treat component_ref's of vars like vars.  */

	tree lhs = TREE_OPERAND (exp, 0);
	tree rhs = TREE_OPERAND (exp, 1);
	tree noncopied_parts = 0;
	tree lhs_type = TREE_TYPE (lhs);

	temp = 0;

	if (TREE_CODE (lhs) != VAR_DECL
	    && TREE_CODE (lhs) != RESULT_DECL
	    && TREE_CODE (lhs) != PARM_DECL)
	  preexpand_calls (exp);

	/* Check for |= or &= of a bitfield of size one into another bitfield
	   of size 1.  In this case, (unless we need the result of the
	   assignment) we can do this more efficiently with a
	   test followed by an assignment, if necessary.

	   ??? At this point, we can't get a BIT_FIELD_REF here.  But if
	   things change so we do, this code should be enhanced to
	   support it.  */
	if (ignore
	    && TREE_CODE (lhs) == COMPONENT_REF
	    && (TREE_CODE (rhs) == BIT_IOR_EXPR
		|| TREE_CODE (rhs) == BIT_AND_EXPR)
	    && TREE_OPERAND (rhs, 0) == lhs
	    && TREE_CODE (TREE_OPERAND (rhs, 1)) == COMPONENT_REF
	    && TREE_INT_CST_LOW (DECL_SIZE (TREE_OPERAND (lhs, 1))) == 1
	    && TREE_INT_CST_LOW (DECL_SIZE (TREE_OPERAND (TREE_OPERAND (rhs, 1), 1))) == 1)
	  {
	    rtx label = gen_label_rtx ();

	    do_jump (TREE_OPERAND (rhs, 1),
		     TREE_CODE (rhs) == BIT_IOR_EXPR ? label : 0,
		     TREE_CODE (rhs) == BIT_AND_EXPR ? label : 0);
	    expand_assignment (lhs, convert (TREE_TYPE (rhs),
					     (TREE_CODE (rhs) == BIT_IOR_EXPR
					      ? integer_one_node
					      : integer_zero_node)),
			       0, 0);
	    do_pending_stack_adjust ();
	    emit_label (label);
	    return const0_rtx;
	  }

	if (TYPE_NONCOPIED_PARTS (lhs_type) != 0
	    && ! (fixed_type_p (lhs) && fixed_type_p (rhs)))
	  noncopied_parts = save_noncopied_parts (stabilize_reference (lhs),
						  TYPE_NONCOPIED_PARTS (lhs_type));

	temp = expand_assignment (lhs, rhs, ! ignore, original_target != 0);
	while (noncopied_parts != 0)
	  {
	    expand_assignment (TREE_PURPOSE (noncopied_parts),
			       TREE_VALUE (noncopied_parts), 0, 0);
	    noncopied_parts = TREE_CHAIN (noncopied_parts);
	  }
	return temp;
      }

    case PREINCREMENT_EXPR:
    case PREDECREMENT_EXPR:
      return expand_increment (exp, 0);

    case POSTINCREMENT_EXPR:
    case POSTDECREMENT_EXPR:
      /* Faster to treat as pre-increment if result is not used.  */
      return expand_increment (exp, ! ignore);

    case ADDR_EXPR:
      /* Are we taking the address of a nested function?  */
      if (TREE_CODE (TREE_OPERAND (exp, 0)) == FUNCTION_DECL
	  && decl_function_context (TREE_OPERAND (exp, 0)) != 0)
	{
	  op0 = trampoline_address (TREE_OPERAND (exp, 0));
	  op0 = force_operand (op0, target);
	}
      else
	{
	  op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode,
			     (modifier == EXPAND_INITIALIZER
			      ? modifier : EXPAND_CONST_ADDRESS));
	  if (GET_CODE (op0) != MEM)
	    abort ();
  
	  if (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
	    return XEXP (op0, 0);
	  op0 = force_operand (XEXP (op0, 0), target);
	}
      if (flag_force_addr && GET_CODE (op0) != REG)
	return force_reg (Pmode, op0);
      return op0;

    case ENTRY_VALUE_EXPR:
      abort ();

    case ERROR_MARK:
      return const0_rtx;

    default:
      return (*lang_expand_expr) (exp, target, tmode, modifier);
    }

  /* Here to do an ordinary binary operator, generating an instruction
     from the optab already placed in `this_optab'.  */
 binop:
  preexpand_calls (exp);
  if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1)))
    subtarget = 0;
  op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
  op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
 binop2:
  temp = expand_binop (mode, this_optab, op0, op1, target,
		       unsignedp, OPTAB_LIB_WIDEN);
  if (temp == 0)
    abort ();
  return temp;
}

/* Return the alignment in bits of EXP, a pointer valued expression.
   But don't return more than MAX_ALIGN no matter what.
   The alignment returned is, by default, the alignment of the thing that
   EXP points to (if it is not a POINTER_TYPE, 0 is returned).

   Otherwise, look at the expression to see if we can do better, i.e., if the
   expression is actually pointing at an object whose alignment is tighter.  */

static int
get_pointer_alignment (exp, max_align)
     tree exp;
     unsigned max_align;
{
  unsigned align, inner;

  if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
    return 0;

  align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
  align = MIN (align, max_align);

  while (1)
    {
      switch (TREE_CODE (exp))
	{
	case NOP_EXPR:
	case CONVERT_EXPR:
	case NON_LVALUE_EXPR:
	  exp = TREE_OPERAND (exp, 0);
	  if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
	    return align;
	  inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
	  inner = MIN (inner, max_align);
	  align = MAX (align, inner);
	  break;

	case PLUS_EXPR:
	  /* If sum of pointer + int, restrict our maximum alignment to that
	     imposed by the integer.  If not, we can't do any better than
	     ALIGN.  */
	  if (TREE_CODE (TREE_OPERAND (exp, 1)) != INTEGER_CST)
	    return align;

	  while (((TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)) * BITS_PER_UNIT)
		  & (max_align - 1))
		 != 0)
	    max_align >>= 1;

	  exp = TREE_OPERAND (exp, 0);
	  break;

	case ADDR_EXPR:
	  /* See what we are pointing at and look at its alignment.  */
	  exp = TREE_OPERAND (exp, 0);
	  if (TREE_CODE (exp) == FUNCTION_DECL)
	    align = MAX (align, FUNCTION_BOUNDARY);
	  else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'd')
	    align = MAX (align, DECL_ALIGN (exp));
#ifdef CONSTANT_ALIGNMENT
	  else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
	    align = CONSTANT_ALIGNMENT (exp, align);
#endif
	  return MIN (align, max_align);

	default:
	  return align;
	}
    }
}

/* Return the tree node and offset if a given argument corresponds to
   a string constant.  */

static tree
string_constant (arg, ptr_offset)
     tree arg;
     tree *ptr_offset;
{
  STRIP_NOPS (arg);

  if (TREE_CODE (arg) == ADDR_EXPR
      && TREE_CODE (TREE_OPERAND (arg, 0)) == STRING_CST)
    {
      *ptr_offset = integer_zero_node;
      return TREE_OPERAND (arg, 0);
    }
  else if (TREE_CODE (arg) == PLUS_EXPR)
    {
      tree arg0 = TREE_OPERAND (arg, 0);
      tree arg1 = TREE_OPERAND (arg, 1);

      STRIP_NOPS (arg0);
      STRIP_NOPS (arg1);

      if (TREE_CODE (arg0) == ADDR_EXPR
	  && TREE_CODE (TREE_OPERAND (arg0, 0)) == STRING_CST)
	{
	  *ptr_offset = arg1;
	  return TREE_OPERAND (arg0, 0);
	}
      else if (TREE_CODE (arg1) == ADDR_EXPR
	       && TREE_CODE (TREE_OPERAND (arg1, 0)) == STRING_CST)
	{
	  *ptr_offset = arg0;
	  return TREE_OPERAND (arg1, 0);
	}
    }

  return 0;
}

/* Compute the length of a C string.  TREE_STRING_LENGTH is not the right
   way, because it could contain a zero byte in the middle.
   TREE_STRING_LENGTH is the size of the character array, not the string.

   Unfortunately, string_constant can't access the values of const char
   arrays with initializers, so neither can we do so here.  */

static tree
c_strlen (src)
     tree src;
{
  tree offset_node;
  int offset, max;
  char *ptr;

  src = string_constant (src, &offset_node);
  if (src == 0)
    return 0;
  max = TREE_STRING_LENGTH (src);
  ptr = TREE_STRING_POINTER (src);
  if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
    {
      /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
	 compute the offset to the following null if we don't know where to
	 start searching for it.  */
      int i;
      for (i = 0; i < max; i++)
	if (ptr[i] == 0)
	  return 0;
      /* We don't know the starting offset, but we do know that the string
	 has no internal zero bytes.  We can assume that the offset falls
	 within the bounds of the string; otherwise, the programmer deserves
	 what he gets.  Subtract the offset from the length of the string,
	 and return that.  */
      /* This would perhaps not be valid if we were dealing with named
         arrays in addition to literal string constants.  */
      return size_binop (MINUS_EXPR, size_int (max), offset_node);
    }

  /* We have a known offset into the string.  Start searching there for
     a null character.  */
  if (offset_node == 0)
    offset = 0;
  else
    {
      /* Did we get a long long offset?  If so, punt.  */
      if (TREE_INT_CST_HIGH (offset_node) != 0)
	return 0;
      offset = TREE_INT_CST_LOW (offset_node);
    }
  /* If the offset is known to be out of bounds, warn, and call strlen at
     runtime.  */
  if (offset < 0 || offset > max)
    {
      warning ("offset outside bounds of constant string");
      return 0;
    }
  /* Use strlen to search for the first zero byte.  Since any strings
     constructed with build_string will have nulls appended, we win even
     if we get handed something like (char[4])"abcd".

     Since OFFSET is our starting index into the string, no further
     calculation is needed.  */
  return size_int (strlen (ptr + offset));
}

/* Expand an expression EXP that calls a built-in function,
   with result going to TARGET if that's convenient
   (and in mode MODE if that's convenient).
   SUBTARGET may be used as the target for computing one of EXP's operands.
   IGNORE is nonzero if the value is to be ignored.  */

static rtx
expand_builtin (exp, target, subtarget, mode, ignore)
     tree exp;
     rtx target;
     rtx subtarget;
     enum machine_mode mode;
     int ignore;
{
  tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
  tree arglist = TREE_OPERAND (exp, 1);
  rtx op0;
  rtx lab1, insns;
  enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));

  switch (DECL_FUNCTION_CODE (fndecl))
    {
    case BUILT_IN_ABS:
    case BUILT_IN_LABS:
    case BUILT_IN_FABS:
      /* build_function_call changes these into ABS_EXPR.  */
      abort ();

    case BUILT_IN_FSQRT:
      /* If not optimizing, call the library function.  */
      if (! optimize)
	break;

      if (arglist == 0
	  /* Arg could be wrong type if user redeclared this fcn wrong.  */
	  || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != REAL_TYPE)
	return CONST0_RTX (TYPE_MODE (TREE_TYPE (exp)));

      /* Stabilize and compute the argument.  */
      if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
	  && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
	{
	  exp = copy_node (exp);
	  arglist = copy_node (arglist);
	  TREE_OPERAND (exp, 1) = arglist;
	  TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
	}
      op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);

      /* Make a suitable register to place result in.  */
      target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));

      emit_queue ();
      start_sequence ();

      /* Compute sqrt into TARGET. 
	 Set TARGET to wherever the result comes back.  */
      target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
			    sqrt_optab, op0, target, 0);

      /* If we were unable to expand via the builtin, stop the
	 sequence (without outputting the insns) and break, causing
	 a call the the library function.  */
      if (target == 0)
	{
	  end_sequence ();
	  break;
        }

      /* Check the results by default.  But if flag_fast_math is turned on,
	 then assume sqrt will always be called with valid arguments.  */

      if (! flag_fast_math)
	{
	  /* Don't define the sqrt instructions
	     if your machine is not IEEE.  */
	  if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
	    abort ();

	  lab1 = gen_label_rtx ();

	  /* Test the result; if it is NaN, set errno=EDOM because
	     the argument was not in the domain.  */
	  emit_cmp_insn (target, target, EQ, 0, GET_MODE (target), 0, 0);
	  emit_jump_insn (gen_beq (lab1));

#if TARGET_EDOM
	  {
#ifdef GEN_ERRNO_RTX
	    rtx errno_rtx = GEN_ERRNO_RTX;
#else
	    rtx errno_rtx
	      = gen_rtx (MEM, word_mode, gen_rtx (SYMBOL_REF, Pmode, "*errno"));
#endif

	    emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
	  }
#else
	  /* We can't set errno=EDOM directly; let the library call do it.
	     Pop the arguments right away in case the call gets deleted. */
	  NO_DEFER_POP;
	  expand_call (exp, target, 0);
	  OK_DEFER_POP;
#endif

	  emit_label (lab1);
	}

      /* Output the entire sequence. */
      insns = get_insns ();
      end_sequence ();
      emit_insns (insns);
 
      return target;

    case BUILT_IN_SAVEREGS:
      /* Don't do __builtin_saveregs more than once in a function.
	 Save the result of the first call and reuse it.  */
      if (saveregs_value != 0)
	return saveregs_value;
      {
	/* When this function is called, it means that registers must be
	   saved on entry to this function.  So we migrate the
	   call to the first insn of this function.  */
	rtx temp;
	rtx seq;
	rtx valreg, saved_valreg;

	/* Now really call the function.  `expand_call' does not call
	   expand_builtin, so there is no danger of infinite recursion here.  */
	start_sequence ();

#ifdef EXPAND_BUILTIN_SAVEREGS
	/* Do whatever the machine needs done in this case.  */
	temp = EXPAND_BUILTIN_SAVEREGS (arglist);
#else
	/* The register where the function returns its value
	   is likely to have something else in it, such as an argument.
	   So preserve that register around the call.  */
	if (value_mode != VOIDmode)
	  {
	    valreg = hard_libcall_value (value_mode);
	    saved_valreg = gen_reg_rtx (value_mode);
	    emit_move_insn (saved_valreg, valreg);
	  }

	/* Generate the call, putting the value in a pseudo.  */
	temp = expand_call (exp, target, ignore);

	if (value_mode != VOIDmode)
	  emit_move_insn (valreg, saved_valreg);
#endif

	seq = get_insns ();
	end_sequence ();

	saveregs_value = temp;

	/* This won't work inside a SEQUENCE--it really has to be
	   at the start of the function.  */
	if (in_sequence_p ())
	  {
	    /* Better to do this than to crash.  */
	    error ("`va_start' used within `({...})'");
	    return temp;
	  }

	/* Put the sequence after the NOTE that starts the function.  */
	emit_insns_before (seq, NEXT_INSN (get_insns ()));
	return temp;
      }

      /* __builtin_args_info (N) returns word N of the arg space info
	 for the current function.  The number and meanings of words
	 is controlled by the definition of CUMULATIVE_ARGS.  */
    case BUILT_IN_ARGS_INFO:
      {
	int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
	int i;
	int *word_ptr = (int *) &current_function_args_info;
	tree type, elts, result;

	if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
	  fatal ("CUMULATIVE_ARGS type defined badly; see %s, line %d",
		 __FILE__, __LINE__);

	if (arglist != 0)
	  {
	    tree arg = TREE_VALUE (arglist);
	    if (TREE_CODE (arg) != INTEGER_CST)
	      error ("argument of __builtin_args_info must be constant");
	    else
	      {
		int wordnum = TREE_INT_CST_LOW (arg);

		if (wordnum < 0 || wordnum >= nwords)
		  error ("argument of __builtin_args_info out of range");
		else
		  return GEN_INT (word_ptr[wordnum]);
	      }
	  }
	else
	  error ("missing argument in __builtin_args_info");

	return const0_rtx;

#if 0
	for (i = 0; i < nwords; i++)
	  elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));

	type = build_array_type (integer_type_node,
				 build_index_type (build_int_2 (nwords, 0)));
	result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
	TREE_CONSTANT (result) = 1;
	TREE_STATIC (result) = 1;
	result = build (INDIRECT_REF, build_pointer_type (type), result);
	TREE_CONSTANT (result) = 1;
	return expand_expr (result, NULL_RTX, VOIDmode, 0);
#endif
      }

      /* Return the address of the first anonymous stack arg.  */
    case BUILT_IN_NEXT_ARG:
      {
	tree fntype = TREE_TYPE (current_function_decl);
	if (!(TYPE_ARG_TYPES (fntype) != 0
	      && (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
		  != void_type_node)))
	  {
	    error ("`va_start' used in function with fixed args");
	    return const0_rtx;
	  }
      }

      return expand_binop (Pmode, add_optab,
			   current_function_internal_arg_pointer,
			   current_function_arg_offset_rtx,
			   NULL_RTX, 0, OPTAB_LIB_WIDEN);

    case BUILT_IN_CLASSIFY_TYPE:
      if (arglist != 0)
	{
	  tree type = TREE_TYPE (TREE_VALUE (arglist));
	  enum tree_code code = TREE_CODE (type);
	  if (code == VOID_TYPE)
	    return GEN_INT (void_type_class);
	  if (code == INTEGER_TYPE)
	    return GEN_INT (integer_type_class);
	  if (code == CHAR_TYPE)
	    return GEN_INT (char_type_class);
	  if (code == ENUMERAL_TYPE)
	    return GEN_INT (enumeral_type_class);
	  if (code == BOOLEAN_TYPE)
	    return GEN_INT (boolean_type_class);
	  if (code == POINTER_TYPE)
	    return GEN_INT (pointer_type_class);
	  if (code == REFERENCE_TYPE)
	    return GEN_INT (reference_type_class);
	  if (code == OFFSET_TYPE)
	    return GEN_INT (offset_type_class);
	  if (code == REAL_TYPE)
	    return GEN_INT (real_type_class);
	  if (code == COMPLEX_TYPE)
	    return GEN_INT (complex_type_class);
	  if (code == FUNCTION_TYPE)
	    return GEN_INT (function_type_class);
	  if (code == METHOD_TYPE)
	    return GEN_INT (method_type_class);
	  if (code == RECORD_TYPE)
	    return GEN_INT (record_type_class);
	  if (code == UNION_TYPE)
	    return GEN_INT (union_type_class);
	  if (code == ARRAY_TYPE)
	    return GEN_INT (array_type_class);
	  if (code == STRING_TYPE)
	    return GEN_INT (string_type_class);
	  if (code == SET_TYPE)
	    return GEN_INT (set_type_class);
	  if (code == FILE_TYPE)
	    return GEN_INT (file_type_class);
	  if (code == LANG_TYPE)
	    return GEN_INT (lang_type_class);
	}
      return GEN_INT (no_type_class);

    case BUILT_IN_CONSTANT_P:
      if (arglist == 0)
	return const0_rtx;
      else
	return (TREE_CODE_CLASS (TREE_VALUE (arglist)) == 'c'
		? const1_rtx : const0_rtx);

    case BUILT_IN_FRAME_ADDRESS:
      /* The argument must be a nonnegative integer constant.
	 It counts the number of frames to scan up the stack.
	 The value is the address of that frame.  */
    case BUILT_IN_RETURN_ADDRESS:
      /* The argument must be a nonnegative integer constant.
	 It counts the number of frames to scan up the stack.
	 The value is the return address saved in that frame.  */
      if (arglist == 0)
	/* Warning about missing arg was already issued.  */
	return const0_rtx;
      else if (TREE_CODE (TREE_VALUE (arglist)) != INTEGER_CST)
	{
	  error ("invalid arg to __builtin_return_address");
	  return const0_rtx;
	}
      else if (tree_int_cst_lt (TREE_VALUE (arglist), integer_zero_node))
	{
	  error ("invalid arg to __builtin_return_address");
	  return const0_rtx;
	}
      else
	{
	  int count = TREE_INT_CST_LOW (TREE_VALUE (arglist)); 
	  rtx tem = frame_pointer_rtx;
	  int i;

	  /* Scan back COUNT frames to the specified frame.  */
	  for (i = 0; i < count; i++)
	    {
	      /* Assume the dynamic chain pointer is in the word that
		 the frame address points to, unless otherwise specified.  */
#ifdef DYNAMIC_CHAIN_ADDRESS
	      tem = DYNAMIC_CHAIN_ADDRESS (tem);
#endif
	      tem = memory_address (Pmode, tem);
	      tem = copy_to_reg (gen_rtx (MEM, Pmode, tem));
	    }

	  /* For __builtin_frame_address, return what we've got.  */
	  if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
	    return tem;

	  /* For __builtin_return_address,
	     Get the return address from that frame.  */
#ifdef RETURN_ADDR_RTX
	  return RETURN_ADDR_RTX (count, tem);
#else
	  tem = memory_address (Pmode,
				plus_constant (tem, GET_MODE_SIZE (Pmode)));
	  return copy_to_reg (gen_rtx (MEM, Pmode, tem));
#endif
	}

    case BUILT_IN_ALLOCA:
      if (arglist == 0
	  /* Arg could be non-integer if user redeclared this fcn wrong.  */
	  || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE)
	return const0_rtx;
      current_function_calls_alloca = 1;
      /* Compute the argument.  */
      op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);

      /* Allocate the desired space.  */
      target = allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);

      /* Record the new stack level for nonlocal gotos.  */
      if (nonlocal_goto_handler_slot != 0)
	emit_stack_save (SAVE_NONLOCAL, &nonlocal_goto_stack_level, NULL_RTX);
      return target;

    case BUILT_IN_FFS:
      /* If not optimizing, call the library function.  */
      if (!optimize)
	break;

      if (arglist == 0
	  /* Arg could be non-integer if user redeclared this fcn wrong.  */
	  || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE)
	return const0_rtx;

      /* Compute the argument.  */
      op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
      /* Compute ffs, into TARGET if possible.
	 Set TARGET to wherever the result comes back.  */
      target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
			    ffs_optab, op0, target, 1);
      if (target == 0)
	abort ();
      return target;

    case BUILT_IN_STRLEN:
      /* If not optimizing, call the library function.  */
      if (!optimize)
	break;

      if (arglist == 0
	  /* Arg could be non-pointer if user redeclared this fcn wrong.  */
	  || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
	return const0_rtx;
      else
	{
	  tree src = TREE_VALUE (arglist);
	  tree len = c_strlen (src);

	  int align
	    = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;

	  rtx result, src_rtx, char_rtx;
	  enum machine_mode insn_mode = value_mode, char_mode;
	  enum insn_code icode;

	  /* If the length is known, just return it. */
	  if (len != 0)
	    return expand_expr (len, target, mode, 0);

	  /* If SRC is not a pointer type, don't do this operation inline. */
	  if (align == 0)
	    break;

	  /* Call a function if we can't compute strlen in the right mode. */

	  while (insn_mode != VOIDmode)
	    {
	      icode = strlen_optab->handlers[(int) insn_mode].insn_code;
	      if (icode != CODE_FOR_nothing)
		break;

	      insn_mode = GET_MODE_WIDER_MODE (insn_mode);
	    }
	  if (insn_mode == VOIDmode)
	    break;

	  /* Make a place to write the result of the instruction.  */
	  result = target;
	  if (! (result != 0
		 && GET_CODE (result) == REG
		 && GET_MODE (result) == insn_mode
		 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
	    result = gen_reg_rtx (insn_mode);

	  /* Make sure the operands are acceptable to the predicates.  */

	  if (! (*insn_operand_predicate[(int)icode][0]) (result, insn_mode))
	    result = gen_reg_rtx (insn_mode);

	  src_rtx = memory_address (BLKmode,
				    expand_expr (src, NULL_RTX, Pmode,
						 EXPAND_NORMAL));
	  if (! (*insn_operand_predicate[(int)icode][1]) (src_rtx, Pmode))
	    src_rtx = copy_to_mode_reg (Pmode, src_rtx);

	  char_rtx = const0_rtx;
	  char_mode = insn_operand_mode[(int)icode][2];
	  if (! (*insn_operand_predicate[(int)icode][2]) (char_rtx, char_mode))
	    char_rtx = copy_to_mode_reg (char_mode, char_rtx);

	  emit_insn (GEN_FCN (icode) (result,
				      gen_rtx (MEM, BLKmode, src_rtx),
				      char_rtx, GEN_INT (align)));

	  /* Return the value in the proper mode for this function.  */
	  if (GET_MODE (result) == value_mode)
	    return result;
	  else if (target != 0)
	    {
	      convert_move (target, result, 0);
	      return target;
	    }
	  else
	    return convert_to_mode (value_mode, result, 0);
	}

    case BUILT_IN_STRCPY:
      /* If not optimizing, call the library function.  */
      if (!optimize)
	break;

      if (arglist == 0
	  /* Arg could be non-pointer if user redeclared this fcn wrong.  */
	  || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
	  || TREE_CHAIN (arglist) == 0
	  || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE)
	return const0_rtx;
      else
	{
	  tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));

	  if (len == 0)
	    break;

	  len = size_binop (PLUS_EXPR, len, integer_one_node);

	  chainon (arglist, build_tree_list (NULL_TREE, len));
	}

      /* Drops in.  */
    case BUILT_IN_MEMCPY:
      /* If not optimizing, call the library function.  */
      if (!optimize)
	break;

      if (arglist == 0
	  /* Arg could be non-pointer if user redeclared this fcn wrong.  */
	  || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
	  || TREE_CHAIN (arglist) == 0
	  || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE
	  || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
	  || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE)
	return const0_rtx;
      else
	{
	  tree dest = TREE_VALUE (arglist);
	  tree src = TREE_VALUE (TREE_CHAIN (arglist));
	  tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));

	  int src_align
	    = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
	  int dest_align
	    = get_pointer_alignment (dest, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
	  rtx dest_rtx;

	  /* If either SRC or DEST is not a pointer type, don't do
	     this operation in-line.  */
	  if (src_align == 0 || dest_align == 0)
	    {
	      if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_STRCPY)
		TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
	      break;
	    }

	  dest_rtx = expand_expr (dest, NULL_RTX, Pmode, EXPAND_NORMAL);

	  /* Copy word part most expediently.  */
	  emit_block_move (gen_rtx (MEM, BLKmode,
				    memory_address (BLKmode, dest_rtx)),
			   gen_rtx (MEM, BLKmode,
				    memory_address (BLKmode,
						    expand_expr (src, NULL_RTX,
								 Pmode,
								 EXPAND_NORMAL))),
			   expand_expr (len, NULL_RTX, VOIDmode, 0),
			   MIN (src_align, dest_align));
	  return dest_rtx;
	}

/* These comparison functions need an instruction that returns an actual
   index.  An ordinary compare that just sets the condition codes
   is not enough.  */
#ifdef HAVE_cmpstrsi
    case BUILT_IN_STRCMP:
      /* If not optimizing, call the library function.  */
      if (!optimize)
	break;

      if (arglist == 0
	  /* Arg could be non-pointer if user redeclared this fcn wrong.  */
	  || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
	  || TREE_CHAIN (arglist) == 0
	  || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE)
	return const0_rtx;
      else if (!HAVE_cmpstrsi)
	break;
      {
	tree arg1 = TREE_VALUE (arglist);
	tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
	tree offset;
	tree len, len2;

	len = c_strlen (arg1);
	if (len)
	  len = size_binop (PLUS_EXPR, integer_one_node, len);
	len2 = c_strlen (arg2);
	if (len2)
	  len2 = size_binop (PLUS_EXPR, integer_one_node, len2);

	/* If we don't have a constant length for the first, use the length
	   of the second, if we know it.  We don't require a constant for
	   this case; some cost analysis could be done if both are available
	   but neither is constant.  For now, assume they're equally cheap.

	   If both strings have constant lengths, use the smaller.  This
	   could arise if optimization results in strcpy being called with
	   two fixed strings, or if the code was machine-generated.  We should
	   add some code to the `memcmp' handler below to deal with such
	   situations, someday.  */
	if (!len || TREE_CODE (len) != INTEGER_CST)
	  {
	    if (len2)
	      len = len2;
	    else if (len == 0)
	      break;
	  }
	else if (len2 && TREE_CODE (len2) == INTEGER_CST)
	  {
	    if (tree_int_cst_lt (len2, len))
	      len = len2;
	  }

	chainon (arglist, build_tree_list (NULL_TREE, len));
      }

      /* Drops in.  */
    case BUILT_IN_MEMCMP:
      /* If not optimizing, call the library function.  */
      if (!optimize)
	break;

      if (arglist == 0
	  /* Arg could be non-pointer if user redeclared this fcn wrong.  */
	  || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
	  || TREE_CHAIN (arglist) == 0
	  || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE
	  || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
	  || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE)
	return const0_rtx;
      else if (!HAVE_cmpstrsi)
	break;
      {
	tree arg1 = TREE_VALUE (arglist);
	tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
	tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
	rtx result;

	int arg1_align
	  = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
	int arg2_align
	  = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
	enum machine_mode insn_mode
	  = insn_operand_mode[(int) CODE_FOR_cmpstrsi][0];

	/* If we don't have POINTER_TYPE, call the function.  */
	if (arg1_align == 0 || arg2_align == 0)
	  {
	    if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_STRCMP)
	      TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
	    break;
	  }

	/* Make a place to write the result of the instruction.  */
	result = target;
	if (! (result != 0
	       && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
	       && REGNO (result) >= FIRST_PSEUDO_REGISTER))
	  result = gen_reg_rtx (insn_mode);

	emit_insn (gen_cmpstrsi (result,
				 gen_rtx (MEM, BLKmode,
					  expand_expr (arg1, NULL_RTX, Pmode,
						       EXPAND_NORMAL)),
				 gen_rtx (MEM, BLKmode,
					  expand_expr (arg2, NULL_RTX, Pmode,
						       EXPAND_NORMAL)),
				 expand_expr (len, NULL_RTX, VOIDmode, 0),
				 GEN_INT (MIN (arg1_align, arg2_align))));

	/* Return the value in the proper mode for this function.  */
	mode = TYPE_MODE (TREE_TYPE (exp));
	if (GET_MODE (result) == mode)
	  return result;
	else if (target != 0)
	  {
	    convert_move (target, result, 0);
	    return target;
	  }
	else
	  return convert_to_mode (mode, result, 0);
      }	
#else
    case BUILT_IN_STRCMP:
    case BUILT_IN_MEMCMP:
      break;
#endif

    default:			/* just do library call, if unknown builtin */
      error ("built-in function %s not currently supported",
	     IDENTIFIER_POINTER (DECL_NAME (fndecl)));
    }

  /* The switch statement above can drop through to cause the function
     to be called normally.  */

  return expand_call (exp, target, ignore);
}

/* Expand code for a post- or pre- increment or decrement
   and return the RTX for the result.
   POST is 1 for postinc/decrements and 0 for preinc/decrements.  */

static rtx
expand_increment (exp, post)
     register tree exp;
     int post;
{
  register rtx op0, op1;
  register rtx temp, value;
  register tree incremented = TREE_OPERAND (exp, 0);
  optab this_optab = add_optab;
  int icode;
  enum machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
  int op0_is_copy = 0;

  /* Stabilize any component ref that might need to be
     evaluated more than once below.  */
  if (TREE_CODE (incremented) == BIT_FIELD_REF
      || (TREE_CODE (incremented) == COMPONENT_REF
	  && (TREE_CODE (TREE_OPERAND (incremented, 0)) != INDIRECT_REF
	      || DECL_BIT_FIELD (TREE_OPERAND (incremented, 1)))))
    incremented = stabilize_reference (incremented);

  /* Compute the operands as RTX.
     Note whether OP0 is the actual lvalue or a copy of it:
     I believe it is a copy iff it is a register or subreg
     and insns were generated in computing it.  */
  temp = get_last_insn ();
  op0 = expand_expr (incremented, NULL_RTX, VOIDmode, 0);
  op0_is_copy = ((GET_CODE (op0) == SUBREG || GET_CODE (op0) == REG)
		 && temp != get_last_insn ());
  op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);

  /* Decide whether incrementing or decrementing.  */
  if (TREE_CODE (exp) == POSTDECREMENT_EXPR
      || TREE_CODE (exp) == PREDECREMENT_EXPR)
    this_optab = sub_optab;

  /* If OP0 is not the actual lvalue, but rather a copy in a register,
     then we cannot just increment OP0.  We must
     therefore contrive to increment the original value.
     Then we can return OP0 since it is a copy of the old value.  */
  if (op0_is_copy)
    {
      /* This is the easiest way to increment the value wherever it is.
	 Problems with multiple evaluation of INCREMENTED
	 are prevented because either (1) it is a component_ref,
	 in which case it was stabilized above, or (2) it is an array_ref
	 with constant index in an array in a register, which is
	 safe to reevaluate.  */
      tree newexp = build ((this_optab == add_optab
			    ? PLUS_EXPR : MINUS_EXPR),
			   TREE_TYPE (exp),
			   incremented,
			   TREE_OPERAND (exp, 1));
      temp = expand_assignment (incremented, newexp, ! post, 0);
      return post ? op0 : temp;
    }

  /* Convert decrement by a constant into a negative increment.  */
  if (this_optab == sub_optab
      && GET_CODE (op1) == CONST_INT)
    {
      op1 = GEN_INT (- INTVAL (op1));
      this_optab = add_optab;
    }

  if (post)
    {
      /* We have a true reference to the value in OP0.
	 If there is an insn to add or subtract in this mode, queue it.  */

#if 0  /* Turned off to avoid making extra insn for indexed memref.  */
      op0 = stabilize (op0);
#endif

      icode = (int) this_optab->handlers[(int) mode].insn_code;
      if (icode != (int) CODE_FOR_nothing
	  /* Make sure that OP0 is valid for operands 0 and 1
	     of the insn we want to queue.  */
	  && (*insn_operand_predicate[icode][0]) (op0, mode)
	  && (*insn_operand_predicate[icode][1]) (op0, mode))
	{
	  if (! (*insn_operand_predicate[icode][2]) (op1, mode))
	    op1 = force_reg (mode, op1);

	  return enqueue_insn (op0, GEN_FCN (icode) (op0, op0, op1));
	}
    }

  /* Preincrement, or we can't increment with one simple insn.  */
  if (post)
    /* Save a copy of the value before inc or dec, to return it later.  */
    temp = value = copy_to_reg (op0);
  else
    /* Arrange to return the incremented value.  */
    /* Copy the rtx because expand_binop will protect from the queue,
       and the results of that would be invalid for us to return
       if our caller does emit_queue before using our result.  */
    temp = copy_rtx (value = op0);

  /* Increment however we can.  */
  op1 = expand_binop (mode, this_optab, value, op1, op0,
		      TREE_UNSIGNED (TREE_TYPE (exp)), OPTAB_LIB_WIDEN);
  /* Make sure the value is stored into OP0.  */
  if (op1 != op0)
    emit_move_insn (op0, op1);

  return temp;
}

/* Expand all function calls contained within EXP, innermost ones first.
   But don't look within expressions that have sequence points.
   For each CALL_EXPR, record the rtx for its value
   in the CALL_EXPR_RTL field.  */

static void
preexpand_calls (exp)
     tree exp;
{
  register int nops, i;
  int type = TREE_CODE_CLASS (TREE_CODE (exp));

  if (! do_preexpand_calls)
    return;

  /* Only expressions and references can contain calls.  */

  if (type != 'e' && type != '<' && type != '1' && type != '2' && type != 'r')
    return;

  switch (TREE_CODE (exp))
    {
    case CALL_EXPR:
      /* Do nothing if already expanded.  */
      if (CALL_EXPR_RTL (exp) != 0)
	return;

      /* Do nothing to built-in functions.  */
      if (TREE_CODE (TREE_OPERAND (exp, 0)) != ADDR_EXPR
	  || TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) != FUNCTION_DECL
	  || ! DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
	CALL_EXPR_RTL (exp) = expand_call (exp, NULL_RTX, 0);
      return;

    case COMPOUND_EXPR:
    case COND_EXPR:
    case TRUTH_ANDIF_EXPR:
    case TRUTH_ORIF_EXPR:
      /* If we find one of these, then we can be sure
	 the adjust will be done for it (since it makes jumps).
	 Do it now, so that if this is inside an argument
	 of a function, we don't get the stack adjustment
	 after some other args have already been pushed.  */
      do_pending_stack_adjust ();
      return;

    case BLOCK:
    case RTL_EXPR:
    case WITH_CLEANUP_EXPR:
      return;

    case SAVE_EXPR:
      if (SAVE_EXPR_RTL (exp) != 0)
	return;
    }

  nops = tree_code_length[(int) TREE_CODE (exp)];
  for (i = 0; i < nops; i++)
    if (TREE_OPERAND (exp, i) != 0)
      {
	type = TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, i)));
	if (type == 'e' || type == '<' || type == '1' || type == '2'
	    || type == 'r')
	  preexpand_calls (TREE_OPERAND (exp, i));
      }
}

/* At the start of a function, record that we have no previously-pushed
   arguments waiting to be popped.  */

void
init_pending_stack_adjust ()
{
  pending_stack_adjust = 0;
}

/* When exiting from function, if safe, clear out any pending stack adjust
   so the adjustment won't get done.  */

void
clear_pending_stack_adjust ()
{
#ifdef EXIT_IGNORE_STACK
  if (! flag_omit_frame_pointer && EXIT_IGNORE_STACK
      && ! (DECL_INLINE (current_function_decl) && ! flag_no_inline)
      && ! flag_inline_functions)
    pending_stack_adjust = 0;
#endif
}

/* Pop any previously-pushed arguments that have not been popped yet.  */

void
do_pending_stack_adjust ()
{
  if (inhibit_defer_pop == 0)
    {
      if (pending_stack_adjust != 0)
	adjust_stack (GEN_INT (pending_stack_adjust));
      pending_stack_adjust = 0;
    }
}

/* Expand all cleanups up to OLD_CLEANUPS.
   Needed here, and also for language-dependent calls.  */

void
expand_cleanups_to (old_cleanups)
     tree old_cleanups;
{
  while (cleanups_this_call != old_cleanups)
    {
      expand_expr (TREE_VALUE (cleanups_this_call), NULL_RTX, VOIDmode, 0);
      cleanups_this_call = TREE_CHAIN (cleanups_this_call);
    }
}

/* Expand conditional expressions.  */

/* Generate code to evaluate EXP and jump to LABEL if the value is zero.
   LABEL is an rtx of code CODE_LABEL, in this function and all the
   functions here.  */

void
jumpifnot (exp, label)
     tree exp;
     rtx label;
{
  do_jump (exp, label, NULL_RTX);
}

/* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */

void
jumpif (exp, label)
     tree exp;
     rtx label;
{
  do_jump (exp, NULL_RTX, label);
}

/* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
   the result is zero, or IF_TRUE_LABEL if the result is one.
   Either of IF_FALSE_LABEL and IF_TRUE_LABEL may be zero,
   meaning fall through in that case.

   do_jump always does any pending stack adjust except when it does not
   actually perform a jump.  An example where there is no jump
   is when EXP is `(foo (), 0)' and IF_FALSE_LABEL is null.

   This function is responsible for optimizing cases such as
   &&, || and comparison operators in EXP.  */

void
do_jump (exp, if_false_label, if_true_label)
     tree exp;
     rtx if_false_label, if_true_label;
{
  register enum tree_code code = TREE_CODE (exp);
  /* Some cases need to create a label to jump to
     in order to properly fall through.
     These cases set DROP_THROUGH_LABEL nonzero.  */
  rtx drop_through_label = 0;
  rtx temp;
  rtx comparison = 0;
  int i;
  tree type;

  emit_queue ();

  switch (code)
    {
    case ERROR_MARK:
      break;

    case INTEGER_CST:
      temp = integer_zerop (exp) ? if_false_label : if_true_label;
      if (temp)
	emit_jump (temp);
      break;

#if 0
      /* This is not true with #pragma weak  */
    case ADDR_EXPR:
      /* The address of something can never be zero.  */
      if (if_true_label)
	emit_jump (if_true_label);
      break;
#endif

    case NOP_EXPR:
      if (TREE_CODE (TREE_OPERAND (exp, 0)) == COMPONENT_REF
	  || TREE_CODE (TREE_OPERAND (exp, 0)) == BIT_FIELD_REF
	  || TREE_CODE (TREE_OPERAND (exp, 0)) == ARRAY_REF)
	goto normal;
    case CONVERT_EXPR:
      /* If we are narrowing the operand, we have to do the compare in the
	 narrower mode.  */
      if ((TYPE_PRECISION (TREE_TYPE (exp))
	   < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp, 0)))))
	goto normal;
    case NON_LVALUE_EXPR:
    case REFERENCE_EXPR:
    case ABS_EXPR:
    case NEGATE_EXPR:
    case LROTATE_EXPR:
    case RROTATE_EXPR:
      /* These cannot change zero->non-zero or vice versa.  */
      do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
      break;

#if 0
      /* This is never less insns than evaluating the PLUS_EXPR followed by
	 a test and can be longer if the test is eliminated.  */
    case PLUS_EXPR:
      /* Reduce to minus.  */
      exp = build (MINUS_EXPR, TREE_TYPE (exp),
		   TREE_OPERAND (exp, 0),
		   fold (build1 (NEGATE_EXPR, TREE_TYPE (TREE_OPERAND (exp, 1)),
				 TREE_OPERAND (exp, 1))));
      /* Process as MINUS.  */
#endif

    case MINUS_EXPR:
      /* Non-zero iff operands of minus differ.  */
      comparison = compare (build (NE_EXPR, TREE_TYPE (exp),
				   TREE_OPERAND (exp, 0),
				   TREE_OPERAND (exp, 1)),
			    NE, NE);
      break;

    case BIT_AND_EXPR:
      /* If we are AND'ing with a small constant, do this comparison in the
	 smallest type that fits.  If the machine doesn't have comparisons
	 that small, it will be converted back to the wider comparison.
	 This helps if we are testing the sign bit of a narrower object.
	 combine can't do this for us because it can't know whether a
	 ZERO_EXTRACT or a compare in a smaller mode exists, but we do.  */

      if (! SLOW_BYTE_ACCESS
	  && TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
	  && TYPE_PRECISION (TREE_TYPE (exp)) <= HOST_BITS_PER_WIDE_INT
	  && (i = floor_log2 (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)))) >= 0
	  && (type = type_for_size (i + 1, 1)) != 0
	  && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (exp))
	  && (cmp_optab->handlers[(int) TYPE_MODE (type)].insn_code
	      != CODE_FOR_nothing))
	{
	  do_jump (convert (type, exp), if_false_label, if_true_label);
	  break;
	}
      goto normal;

    case TRUTH_NOT_EXPR:
      do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label);
      break;

    case TRUTH_ANDIF_EXPR:
      if (if_false_label == 0)
	if_false_label = drop_through_label = gen_label_rtx ();
      do_jump (TREE_OPERAND (exp, 0), if_false_label, NULL_RTX);
      do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
      break;

    case TRUTH_ORIF_EXPR:
      if (if_true_label == 0)
	if_true_label = drop_through_label = gen_label_rtx ();
      do_jump (TREE_OPERAND (exp, 0), NULL_RTX, if_true_label);
      do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
      break;

    case COMPOUND_EXPR:
      expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0);
      free_temp_slots ();
      emit_queue ();
      do_pending_stack_adjust ();
      do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
      break;

    case COMPONENT_REF:
    case BIT_FIELD_REF:
    case ARRAY_REF:
      {
	int bitsize, bitpos, unsignedp;
	enum machine_mode mode;
	tree type;
	tree offset;
	int volatilep = 0;

	/* Get description of this reference.  We don't actually care
	   about the underlying object here.  */
	get_inner_reference (exp, &bitsize, &bitpos, &offset,
			     &mode, &unsignedp, &volatilep);

	type = type_for_size (bitsize, unsignedp);
	if (! SLOW_BYTE_ACCESS
	    && type != 0 && bitsize >= 0
	    && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (exp))
	    && (cmp_optab->handlers[(int) TYPE_MODE (type)].insn_code
		!= CODE_FOR_nothing))
	  {
	    do_jump (convert (type, exp), if_false_label, if_true_label);
	    break;
	  }
	goto normal;
      }

    case COND_EXPR:
      /* Do (a ? 1 : 0) and (a ? 0 : 1) as special cases.  */
      if (integer_onep (TREE_OPERAND (exp, 1))
	  && integer_zerop (TREE_OPERAND (exp, 2)))
	do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);

      else if (integer_zerop (TREE_OPERAND (exp, 1))
	       && integer_onep (TREE_OPERAND (exp, 2)))
	do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label);

      else
	{
	  register rtx label1 = gen_label_rtx ();
	  drop_through_label = gen_label_rtx ();
	  do_jump (TREE_OPERAND (exp, 0), label1, NULL_RTX);
	  /* Now the THEN-expression.  */
	  do_jump (TREE_OPERAND (exp, 1),
		   if_false_label ? if_false_label : drop_through_label,
		   if_true_label ? if_true_label : drop_through_label);
	  /* In case the do_jump just above never jumps.  */
	  do_pending_stack_adjust ();
	  emit_label (label1);
	  /* Now the ELSE-expression.  */
	  do_jump (TREE_OPERAND (exp, 2),
		   if_false_label ? if_false_label : drop_through_label,
		   if_true_label ? if_true_label : drop_through_label);
	}
      break;

    case EQ_EXPR:
      if (integer_zerop (TREE_OPERAND (exp, 1)))
	do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label);
      else if ((GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))
		== MODE_INT)
	       && 
	       !can_compare_p (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))))
	do_jump_by_parts_equality (exp, if_false_label, if_true_label);
      else
	comparison = compare (exp, EQ, EQ);
      break;

    case NE_EXPR:
      if (integer_zerop (TREE_OPERAND (exp, 1)))
	do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
      else if ((GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))
		== MODE_INT)
	       && 
	       !can_compare_p (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))))
	do_jump_by_parts_equality (exp, if_true_label, if_false_label);
      else
	comparison = compare (exp, NE, NE);
      break;

    case LT_EXPR:
      if ((GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))
	   == MODE_INT)
	  && !can_compare_p (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))))
	do_jump_by_parts_greater (exp, 1, if_false_label, if_true_label);
      else
	comparison = compare (exp, LT, LTU);
      break;

    case LE_EXPR:
      if ((GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))
	   == MODE_INT)
	  && !can_compare_p (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))))
	do_jump_by_parts_greater (exp, 0, if_true_label, if_false_label);
      else
	comparison = compare (exp, LE, LEU);
      break;

    case GT_EXPR:
      if ((GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))
	   == MODE_INT)
	  && !can_compare_p (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))))
	do_jump_by_parts_greater (exp, 0, if_false_label, if_true_label);
      else
	comparison = compare (exp, GT, GTU);
      break;

    case GE_EXPR:
      if ((GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))
	   == MODE_INT)
	  && !can_compare_p (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))))
	do_jump_by_parts_greater (exp, 1, if_true_label, if_false_label);
      else
	comparison = compare (exp, GE, GEU);
      break;

    default:
    normal:
      temp = expand_expr (exp, NULL_RTX, VOIDmode, 0);
#if 0
      /* This is not needed any more and causes poor code since it causes
	 comparisons and tests from non-SI objects to have different code
	 sequences.  */
      /* Copy to register to avoid generating bad insns by cse
	 from (set (mem ...) (arithop))  (set (cc0) (mem ...)).  */
      if (!cse_not_expected && GET_CODE (temp) == MEM)
	temp = copy_to_reg (temp);
#endif
      do_pending_stack_adjust ();
      if (GET_CODE (temp) == CONST_INT)
	comparison = (temp == const0_rtx ? const0_rtx : const_true_rtx);
      else if (GET_CODE (temp) == LABEL_REF)
	comparison = const_true_rtx;
      else if (GET_MODE_CLASS (GET_MODE (temp)) == MODE_INT
	       && !can_compare_p (GET_MODE (temp)))
	/* Note swapping the labels gives us not-equal.  */
	do_jump_by_parts_equality_rtx (temp, if_true_label, if_false_label);
      else if (GET_MODE (temp) != VOIDmode)
	comparison = compare_from_rtx (temp, CONST0_RTX (GET_MODE (temp)),
				       NE, 1, GET_MODE (temp), NULL_RTX, 0);
      else
	abort ();
    }

  /* Do any postincrements in the expression that was tested.  */
  emit_queue ();

  /* If COMPARISON is nonzero here, it is an rtx that can be substituted
     straight into a conditional jump instruction as the jump condition.
     Otherwise, all the work has been done already.  */

  if (comparison == const_true_rtx)
    {
      if (if_true_label)
	emit_jump (if_true_label);
    }
  else if (comparison == const0_rtx)
    {
      if (if_false_label)
	emit_jump (if_false_label);
    }
  else if (comparison)
    do_jump_for_compare (comparison, if_false_label, if_true_label);

  free_temp_slots ();

  if (drop_through_label)
    {
      /* If do_jump produces code that might be jumped around,
	 do any stack adjusts from that code, before the place
	 where control merges in.  */
      do_pending_stack_adjust ();
      emit_label (drop_through_label);
    }
}

/* Given a comparison expression EXP for values too wide to be compared
   with one insn, test the comparison and jump to the appropriate label.
   The code of EXP is ignored; we always test GT if SWAP is 0,
   and LT if SWAP is 1.  */

static void
do_jump_by_parts_greater (exp, swap, if_false_label, if_true_label)
     tree exp;
     int swap;
     rtx if_false_label, if_true_label;
{
  rtx op0 = expand_expr (TREE_OPERAND (exp, swap), NULL_RTX, VOIDmode, 0);
  rtx op1 = expand_expr (TREE_OPERAND (exp, !swap), NULL_RTX, VOIDmode, 0);
  enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
  int nwords = (GET_MODE_SIZE (mode) / UNITS_PER_WORD);
  rtx drop_through_label = 0;
  int unsignedp = TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0)));
  int i;

  if (! if_true_label || ! if_false_label)
    drop_through_label = gen_label_rtx ();
  if (! if_true_label)
    if_true_label = drop_through_label;
  if (! if_false_label)
    if_false_label = drop_through_label;

  /* Compare a word at a time, high order first.  */
  for (i = 0; i < nwords; i++)
    {
      rtx comp;
      rtx op0_word, op1_word;

      if (WORDS_BIG_ENDIAN)
	{
	  op0_word = operand_subword_force (op0, i, mode);
	  op1_word = operand_subword_force (op1, i, mode);
	}
      else
	{
	  op0_word = operand_subword_force (op0, nwords - 1 - i, mode);
	  op1_word = operand_subword_force (op1, nwords - 1 - i, mode);
	}

      /* All but high-order word must be compared as unsigned.  */
      comp = compare_from_rtx (op0_word, op1_word,
			       (unsignedp || i > 0) ? GTU : GT,
			       unsignedp, word_mode, NULL_RTX, 0);
      if (comp == const_true_rtx)
	emit_jump (if_true_label);
      else if (comp != const0_rtx)
	do_jump_for_compare (comp, NULL_RTX, if_true_label);

      /* Consider lower words only if these are equal.  */
      comp = compare_from_rtx (op0_word, op1_word, NE, unsignedp, word_mode,
			       NULL_RTX, 0);
      if (comp == const_true_rtx)
	emit_jump (if_false_label);
      else if (comp != const0_rtx)
	do_jump_for_compare (comp, NULL_RTX, if_false_label);
    }

  if (if_false_label)
    emit_jump (if_false_label);
  if (drop_through_label)
    emit_label (drop_through_label);
}

/* Given an EQ_EXPR expression EXP for values too wide to be compared
   with one insn, test the comparison and jump to the appropriate label.  */

static void
do_jump_by_parts_equality (exp, if_false_label, if_true_label)
     tree exp;
     rtx if_false_label, if_true_label;
{
  rtx op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
  rtx op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
  enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
  int nwords = (GET_MODE_SIZE (mode) / UNITS_PER_WORD);
  int i;
  rtx drop_through_label = 0;

  if (! if_false_label)
    drop_through_label = if_false_label = gen_label_rtx ();

  for (i = 0; i < nwords; i++)
    {
      rtx comp = compare_from_rtx (operand_subword_force (op0, i, mode),
				   operand_subword_force (op1, i, mode),
				   EQ, 0, word_mode, NULL_RTX, 0);
      if (comp == const_true_rtx)
	emit_jump (if_false_label);
      else if (comp != const0_rtx)
	do_jump_for_compare (comp, if_false_label, NULL_RTX);
    }

  if (if_true_label)
    emit_jump (if_true_label);
  if (drop_through_label)
    emit_label (drop_through_label);
}

/* Jump according to whether OP0 is 0.
   We assume that OP0 has an integer mode that is too wide
   for the available compare insns.  */

static void
do_jump_by_parts_equality_rtx (op0, if_false_label, if_true_label)
     rtx op0;
     rtx if_false_label, if_true_label;
{
  int nwords = GET_MODE_SIZE (GET_MODE (op0)) / UNITS_PER_WORD;
  int i;
  rtx drop_through_label = 0;

  if (! if_false_label)
    drop_through_label = if_false_label = gen_label_rtx ();

  for (i = 0; i < nwords; i++)
    {
      rtx comp = compare_from_rtx (operand_subword_force (op0, i,
							  GET_MODE (op0)),
				   const0_rtx, EQ, 0, word_mode, NULL_RTX, 0);
      if (comp == const_true_rtx)
	emit_jump (if_false_label);
      else if (comp != const0_rtx)
	do_jump_for_compare (comp, if_false_label, NULL_RTX);
    }

  if (if_true_label)
    emit_jump (if_true_label);
  if (drop_through_label)
    emit_label (drop_through_label);
}

/* Given a comparison expression in rtl form, output conditional branches to
   IF_TRUE_LABEL, IF_FALSE_LABEL, or both.  */

static void
do_jump_for_compare (comparison, if_false_label, if_true_label)
     rtx comparison, if_false_label, if_true_label;
{
  if (if_true_label)
    {
      if (bcc_gen_fctn[(int) GET_CODE (comparison)] != 0)
	emit_jump_insn ((*bcc_gen_fctn[(int) GET_CODE (comparison)]) (if_true_label));
      else
	abort ();

      if (if_false_label)
	emit_jump (if_false_label);
    }
  else if (if_false_label)
    {
      rtx insn;
      rtx prev = PREV_INSN (get_last_insn ());
      rtx branch = 0;

      /* Output the branch with the opposite condition.  Then try to invert
	 what is generated.  If more than one insn is a branch, or if the
	 branch is not the last insn written, abort. If we can't invert
	 the branch, emit make a true label, redirect this jump to that,
	 emit a jump to the false label and define the true label.  */

      if (bcc_gen_fctn[(int) GET_CODE (comparison)] != 0)
	emit_jump_insn ((*bcc_gen_fctn[(int) GET_CODE (comparison)]) (if_false_label));
      else
	abort ();

      /* Here we get the insn before what was just emitted.
	 On some machines, emitting the branch can discard
	 the previous compare insn and emit a replacement.  */
      if (prev == 0)
	/* If there's only one preceding insn...  */
	insn = get_insns ();
      else
	insn = NEXT_INSN (prev);

      for (insn = NEXT_INSN (insn); insn; insn = NEXT_INSN (insn))
	if (GET_CODE (insn) == JUMP_INSN)
	  {
	    if (branch)
	      abort ();
	    branch = insn;
	  }

      if (branch != get_last_insn ())
	abort ();

      if (! invert_jump (branch, if_false_label))
	{
	  if_true_label = gen_label_rtx ();
	  redirect_jump (branch, if_true_label);
	  emit_jump (if_false_label);
	  emit_label (if_true_label);
	}
    }
}

/* Generate code for a comparison expression EXP
   (including code to compute the values to be compared)
   and set (CC0) according to the result.
   SIGNED_CODE should be the rtx operation for this comparison for
   signed data; UNSIGNED_CODE, likewise for use if data is unsigned.

   We force a stack adjustment unless there are currently
   things pushed on the stack that aren't yet used.  */

static rtx
compare (exp, signed_code, unsigned_code)
     register tree exp;
     enum rtx_code signed_code, unsigned_code;
{
  register rtx op0
    = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
  register rtx op1
    = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
  register tree type = TREE_TYPE (TREE_OPERAND (exp, 0));
  register enum machine_mode mode = TYPE_MODE (type);
  int unsignedp = TREE_UNSIGNED (type);
  enum rtx_code code = unsignedp ? unsigned_code : signed_code;

  return compare_from_rtx (op0, op1, code, unsignedp, mode,
			   ((mode == BLKmode)
			    ? expr_size (TREE_OPERAND (exp, 0)) : NULL_RTX),
			   TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT);
}

/* Like compare but expects the values to compare as two rtx's.
   The decision as to signed or unsigned comparison must be made by the caller.

   If MODE is BLKmode, SIZE is an RTX giving the size of the objects being
   compared.

   If ALIGN is non-zero, it is the alignment of this type; if zero, the
   size of MODE should be used.  */

rtx
compare_from_rtx (op0, op1, code, unsignedp, mode, size, align)
     register rtx op0, op1;
     enum rtx_code code;
     int unsignedp;
     enum machine_mode mode;
     rtx size;
     int align;
{
  /* If one operand is constant, make it the second one.  */

  if (GET_CODE (op0) == CONST_INT || GET_CODE (op0) == CONST_DOUBLE)
    {
      rtx tem = op0;
      op0 = op1;
      op1 = tem;
      code = swap_condition (code);
    }

  if (flag_force_mem)
    {
      op0 = force_not_mem (op0);
      op1 = force_not_mem (op1);
    }

  do_pending_stack_adjust ();

  if (GET_CODE (op0) == CONST_INT && GET_CODE (op1) == CONST_INT)
    return simplify_relational_operation (code, mode, op0, op1);

  /* If this is a signed equality comparison, we can do it as an
     unsigned comparison since zero-extension is cheaper than sign
     extension and comparisons with zero are done as unsigned.  This is
     the case even on machines that can do fast sign extension, since
     zero-extension is easier to combinen with other operations than
     sign-extension is.  If we are comparing against a constant, we must
     convert it to what it would look like unsigned.  */
  if ((code == EQ || code == NE) && ! unsignedp
      && GET_MODE_BITSIZE (GET_MODE (op0)) <= HOST_BITS_PER_WIDE_INT)
    {
      if (GET_CODE (op1) == CONST_INT
	  && (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0))) != INTVAL (op1))
	op1 = GEN_INT (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0)));
      unsignedp = 1;
    }
	
  emit_cmp_insn (op0, op1, code, size, mode, unsignedp, align);

  return gen_rtx (code, VOIDmode, cc0_rtx, const0_rtx);
}

/* Generate code to calculate EXP using a store-flag instruction
   and return an rtx for the result.  EXP is either a comparison
   or a TRUTH_NOT_EXPR whose operand is a comparison.

   If TARGET is nonzero, store the result there if convenient.

   If ONLY_CHEAP is non-zero, only do this if it is likely to be very
   cheap.

   Return zero if there is no suitable set-flag instruction
   available on this machine.

   Once expand_expr has been called on the arguments of the comparison,
   we are committed to doing the store flag, since it is not safe to
   re-evaluate the expression.  We emit the store-flag insn by calling
   emit_store_flag, but only expand the arguments if we have a reason
   to believe that emit_store_flag will be successful.  If we think that
   it will, but it isn't, we have to simulate the store-flag with a
   set/jump/set sequence.  */

static rtx
do_store_flag (exp, target, mode, only_cheap)
     tree exp;
     rtx target;
     enum machine_mode mode;
     int only_cheap;
{
  enum rtx_code code;
  tree arg0, arg1, type;
  tree tem;
  enum machine_mode operand_mode;
  int invert = 0;
  int unsignedp;
  rtx op0, op1;
  enum insn_code icode;
  rtx subtarget = target;
  rtx result, label, pattern, jump_pat;

  /* If this is a TRUTH_NOT_EXPR, set a flag indicating we must invert the
     result at the end.  We can't simply invert the test since it would
     have already been inverted if it were valid.  This case occurs for
     some floating-point comparisons.  */

  if (TREE_CODE (exp) == TRUTH_NOT_EXPR)
    invert = 1, exp = TREE_OPERAND (exp, 0);

  arg0 = TREE_OPERAND (exp, 0);
  arg1 = TREE_OPERAND (exp, 1);
  type = TREE_TYPE (arg0);
  operand_mode = TYPE_MODE (type);
  unsignedp = TREE_UNSIGNED (type);

  /* We won't bother with BLKmode store-flag operations because it would mean
     passing a lot of information to emit_store_flag.  */
  if (operand_mode == BLKmode)
    return 0;

  STRIP_NOPS (arg0);
  STRIP_NOPS (arg1);

  /* Get the rtx comparison code to use.  We know that EXP is a comparison
     operation of some type.  Some comparisons against 1 and -1 can be
     converted to comparisons with zero.  Do so here so that the tests
     below will be aware that we have a comparison with zero.   These
     tests will not catch constants in the first operand, but constants
     are rarely passed as the first operand.  */

  switch (TREE_CODE (exp))
    {
    case EQ_EXPR:
      code = EQ;
      break;
    case NE_EXPR:
      code = NE;
      break;
    case LT_EXPR:
      if (integer_onep (arg1))
	arg1 = integer_zero_node, code = unsignedp ? LEU : LE;
      else
	code = unsignedp ? LTU : LT;
      break;
    case LE_EXPR:
      if (integer_all_onesp (arg1))
	arg1 = integer_zero_node, code = unsignedp ? LTU : LT;
      else
	code = unsignedp ? LEU : LE;
      break;
    case GT_EXPR:
      if (integer_all_onesp (arg1))
	arg1 = integer_zero_node, code = unsignedp ? GEU : GE;
      else
	code = unsignedp ? GTU : GT;
      break;
    case GE_EXPR:
      if (integer_onep (arg1))
	arg1 = integer_zero_node, code = unsignedp ? GTU : GT;
      else
	code = unsignedp ? GEU : GE;
      break;
    default:
      abort ();
    }

  /* Put a constant second.  */
  if (TREE_CODE (arg0) == REAL_CST || TREE_CODE (arg0) == INTEGER_CST)
    {
      tem = arg0; arg0 = arg1; arg1 = tem;
      code = swap_condition (code);
    }

  /* If this is an equality or inequality test of a single bit, we can
     do this by shifting the bit being tested to the low-order bit and
     masking the result with the constant 1.  If the condition was EQ,
     we xor it with 1.  This does not require an scc insn and is faster
     than an scc insn even if we have it.  */

  if ((code == NE || code == EQ)
      && TREE_CODE (arg0) == BIT_AND_EXPR && integer_zerop (arg1)
      && integer_pow2p (TREE_OPERAND (arg0, 1))
      && TYPE_PRECISION (type) <= HOST_BITS_PER_WIDE_INT)
    {
      int bitnum = exact_log2 (INTVAL (expand_expr (TREE_OPERAND (arg0, 1),
						    NULL_RTX, VOIDmode, 0)));

      if (subtarget == 0 || GET_CODE (subtarget) != REG
	  || GET_MODE (subtarget) != operand_mode
	  || ! safe_from_p (subtarget, TREE_OPERAND (arg0, 0)))
	subtarget = 0;

      op0 = expand_expr (TREE_OPERAND (arg0, 0), subtarget, VOIDmode, 0);

      if (bitnum != 0)
	op0 = expand_shift (RSHIFT_EXPR, GET_MODE (op0), op0,
			    size_int (bitnum), target, 1);

      if (GET_MODE (op0) != mode)
	op0 = convert_to_mode (mode, op0, 1);

      if (bitnum != TYPE_PRECISION (type) - 1)
	op0 = expand_and (op0, const1_rtx, target);

      if ((code == EQ && ! invert) || (code == NE && invert))
	op0 = expand_binop (mode, xor_optab, op0, const1_rtx, target, 0,
			    OPTAB_LIB_WIDEN);

      return op0;
    }

  /* Now see if we are likely to be able to do this.  Return if not.  */
  if (! can_compare_p (operand_mode))
    return 0;
  icode = setcc_gen_code[(int) code];
  if (icode == CODE_FOR_nothing
      || (only_cheap && insn_operand_mode[(int) icode][0] != mode))
    {
      /* We can only do this if it is one of the special cases that
	 can be handled without an scc insn.  */
      if ((code == LT && integer_zerop (arg1))
	  || (! only_cheap && code == GE && integer_zerop (arg1)))
	;
      else if (BRANCH_COST >= 0
	       && ! only_cheap && (code == NE || code == EQ)
	       && TREE_CODE (type) != REAL_TYPE
	       && ((abs_optab->handlers[(int) operand_mode].insn_code
		    != CODE_FOR_nothing)
		   || (ffs_optab->handlers[(int) operand_mode].insn_code
		       != CODE_FOR_nothing)))
	;
      else
	return 0;
    }
      
  preexpand_calls (exp);
  if (subtarget == 0 || GET_CODE (subtarget) != REG
      || GET_MODE (subtarget) != operand_mode
      || ! safe_from_p (subtarget, arg1))
    subtarget = 0;

  op0 = expand_expr (arg0, subtarget, VOIDmode, 0);
  op1 = expand_expr (arg1, NULL_RTX, VOIDmode, 0);

  if (target == 0)
    target = gen_reg_rtx (mode);

  result = emit_store_flag (target, code, op0, op1, operand_mode,
			    unsignedp, 1);

  if (result)
    {
      if (invert)
	result = expand_binop (mode, xor_optab, result, const1_rtx,
			       result, 0, OPTAB_LIB_WIDEN);
      return result;
    }

  /* If this failed, we have to do this with set/compare/jump/set code.  */
  if (target == 0 || GET_CODE (target) != REG
      || reg_mentioned_p (target, op0) || reg_mentioned_p (target, op1))
    target = gen_reg_rtx (GET_MODE (target));

  emit_move_insn (target, invert ? const0_rtx : const1_rtx);
  result = compare_from_rtx (op0, op1, code, unsignedp,
			     operand_mode, NULL_RTX, 0);
  if (GET_CODE (result) == CONST_INT)
    return (((result == const0_rtx && ! invert)
	     || (result != const0_rtx && invert))
	    ? const0_rtx : const1_rtx);

  label = gen_label_rtx ();
  if (bcc_gen_fctn[(int) code] == 0)
    abort ();

  emit_jump_insn ((*bcc_gen_fctn[(int) code]) (label));
  emit_move_insn (target, invert ? const1_rtx : const0_rtx);
  emit_label (label);

  return target;
}

/* Generate a tablejump instruction (used for switch statements).  */

#ifdef HAVE_tablejump

/* INDEX is the value being switched on, with the lowest value
   in the table already subtracted.
   MODE is its expected mode (needed if INDEX is constant).
   RANGE is the length of the jump table.
   TABLE_LABEL is a CODE_LABEL rtx for the table itself.

   DEFAULT_LABEL is a CODE_LABEL rtx to jump to if the
   index value is out of range.  */

void
do_tablejump (index, mode, range, table_label, default_label)
     rtx index, range, table_label, default_label;
     enum machine_mode mode;
{
  register rtx temp, vector;

  /* Do an unsigned comparison (in the proper mode) between the index
     expression and the value which represents the length of the range.
     Since we just finished subtracting the lower bound of the range
     from the index expression, this comparison allows us to simultaneously
     check that the original index expression value is both greater than
     or equal to the minimum value of the range and less than or equal to
     the maximum value of the range.  */

  emit_cmp_insn (range, index, LTU, NULL_RTX, mode, 0, 0);
  emit_jump_insn (gen_bltu (default_label));

  /* If index is in range, it must fit in Pmode.
     Convert to Pmode so we can index with it.  */
  if (mode != Pmode)
    index = convert_to_mode (Pmode, index, 1);

  /* If flag_force_addr were to affect this address
     it could interfere with the tricky assumptions made
     about addresses that contain label-refs,
     which may be valid only very near the tablejump itself.  */
  /* ??? The only correct use of CASE_VECTOR_MODE is the one inside the
     GET_MODE_SIZE, because this indicates how large insns are.  The other
     uses should all be Pmode, because they are addresses.  This code
     could fail if addresses and insns are not the same size.  */
  index = memory_address_noforce
    (CASE_VECTOR_MODE,
     gen_rtx (PLUS, Pmode,
	      gen_rtx (MULT, Pmode, index,
		       GEN_INT (GET_MODE_SIZE (CASE_VECTOR_MODE))),
	      gen_rtx (LABEL_REF, Pmode, table_label)));
  temp = gen_reg_rtx (CASE_VECTOR_MODE);
  vector = gen_rtx (MEM, CASE_VECTOR_MODE, index);
  RTX_UNCHANGING_P (vector) = 1;
  convert_move (temp, vector, 0);

  emit_jump_insn (gen_tablejump (temp, table_label));

#ifndef CASE_VECTOR_PC_RELATIVE
  /* If we are generating PIC code or if the table is PC-relative, the
     table and JUMP_INSN must be adjacent, so don't output a BARRIER.  */
  if (! flag_pic)
    emit_barrier ();
#endif
}

#endif /* HAVE_tablejump */