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
|
/* Copyright (C) 2006-2017 Free Software Foundation, Inc.
This file is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any
later version.
This file 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* Moderately Space-optimized libgcc routines for the Renesas SH /
STMicroelectronics ST40 CPUs.
Contributed by J"orn Rennecke joern.rennecke@st.com. */
#include "lib1funcs.h"
#ifdef L_udivsi3_i4i
/* 88 bytes; sh4-200 cycle counts:
divisor >= 2G: 11 cycles
dividend < 2G: 48 cycles
dividend >= 2G: divisor != 1: 54 cycles
dividend >= 2G, divisor == 1: 22 cycles */
#if defined (__SH_FPU_DOUBLE__) || defined (__SH4_SINGLE_ONLY__)
!! args in r4 and r5, result in r0, clobber r1
.global GLOBAL(udivsi3_i4i)
FUNC(GLOBAL(udivsi3_i4i))
GLOBAL(udivsi3_i4i):
mova L1,r0
cmp/pz r5
sts fpscr,r1
lds.l @r0+,fpscr
sts.l fpul,@-r15
bf LOCAL(huge_divisor)
mov.l r1,@-r15
lds r4,fpul
cmp/pz r4
#ifdef FMOVD_WORKS
fmov.d dr0,@-r15
float fpul,dr0
fmov.d dr2,@-r15
bt LOCAL(dividend_adjusted)
mov #1,r1
fmov.d @r0,dr2
cmp/eq r1,r5
bt LOCAL(div_by_1)
fadd dr2,dr0
LOCAL(dividend_adjusted):
lds r5,fpul
float fpul,dr2
fdiv dr2,dr0
LOCAL(div_by_1):
fmov.d @r15+,dr2
ftrc dr0,fpul
fmov.d @r15+,dr0
#else /* !FMOVD_WORKS */
fmov.s DR01,@-r15
mov #1,r1
fmov.s DR00,@-r15
float fpul,dr0
fmov.s DR21,@-r15
bt/s LOCAL(dividend_adjusted)
fmov.s DR20,@-r15
cmp/eq r1,r5
bt LOCAL(div_by_1)
fmov.s @r0+,DR20
fmov.s @r0,DR21
fadd dr2,dr0
LOCAL(dividend_adjusted):
lds r5,fpul
float fpul,dr2
fdiv dr2,dr0
LOCAL(div_by_1):
fmov.s @r15+,DR20
fmov.s @r15+,DR21
ftrc dr0,fpul
fmov.s @r15+,DR00
fmov.s @r15+,DR01
#endif /* !FMOVD_WORKS */
lds.l @r15+,fpscr
sts fpul,r0
rts
lds.l @r15+,fpul
#ifdef FMOVD_WORKS
.p2align 3 ! make double below 8 byte aligned.
#endif
LOCAL(huge_divisor):
lds r1,fpscr
add #4,r15
cmp/hs r5,r4
rts
movt r0
.p2align 2
L1:
#ifndef FMOVD_WORKS
.long 0x80000
#else
.long 0x180000
#endif
.double 4294967296
ENDFUNC(GLOBAL(udivsi3_i4i))
#elif !defined (__sh1__) /* !__SH_FPU_DOUBLE__ */
#if 0
/* With 36 bytes, the following would probably be the most compact
implementation, but with 139 cycles on an sh4-200, it is extremely slow. */
GLOBAL(udivsi3_i4i):
mov.l r2,@-r15
mov #0,r1
div0u
mov r1,r2
mov.l r3,@-r15
mov r1,r3
sett
mov r4,r0
LOCAL(loop):
rotcr r2
;
bt/s LOCAL(end)
cmp/gt r2,r3
rotcl r0
bra LOCAL(loop)
div1 r5,r1
LOCAL(end):
rotcl r0
mov.l @r15+,r3
rts
mov.l @r15+,r2
#endif /* 0 */
/* Size: 186 bytes jointly for udivsi3_i4i and sdivsi3_i4i
sh4-200 run times:
udiv small divisor: 55 cycles
udiv large divisor: 52 cycles
sdiv small divisor, positive result: 59 cycles
sdiv large divisor, positive result: 56 cycles
sdiv small divisor, negative result: 65 cycles (*)
sdiv large divisor, negative result: 62 cycles (*)
(*): r2 is restored in the rts delay slot and has a lingering latency
of two more cycles. */
.balign 4
.global GLOBAL(udivsi3_i4i)
FUNC(GLOBAL(udivsi3_i4i))
FUNC(GLOBAL(sdivsi3_i4i))
GLOBAL(udivsi3_i4i):
sts pr,r1
mov.l r4,@-r15
extu.w r5,r0
cmp/eq r5,r0
swap.w r4,r0
shlr16 r4
bf/s LOCAL(large_divisor)
div0u
mov.l r5,@-r15
shll16 r5
LOCAL(sdiv_small_divisor):
div1 r5,r4
bsr LOCAL(div6)
div1 r5,r4
div1 r5,r4
bsr LOCAL(div6)
div1 r5,r4
xtrct r4,r0
xtrct r0,r4
bsr LOCAL(div7)
swap.w r4,r4
div1 r5,r4
bsr LOCAL(div7)
div1 r5,r4
xtrct r4,r0
mov.l @r15+,r5
swap.w r0,r0
mov.l @r15+,r4
jmp @r1
rotcl r0
LOCAL(div7):
div1 r5,r4
LOCAL(div6):
div1 r5,r4; div1 r5,r4; div1 r5,r4
div1 r5,r4; div1 r5,r4; rts; div1 r5,r4
LOCAL(divx3):
rotcl r0
div1 r5,r4
rotcl r0
div1 r5,r4
rotcl r0
rts
div1 r5,r4
LOCAL(large_divisor):
mov.l r5,@-r15
LOCAL(sdiv_large_divisor):
xor r4,r0
.rept 4
rotcl r0
bsr LOCAL(divx3)
div1 r5,r4
.endr
mov.l @r15+,r5
mov.l @r15+,r4
jmp @r1
rotcl r0
ENDFUNC(GLOBAL(udivsi3_i4i))
.global GLOBAL(sdivsi3_i4i)
GLOBAL(sdivsi3_i4i):
mov.l r4,@-r15
cmp/pz r5
mov.l r5,@-r15
bt/s LOCAL(pos_divisor)
cmp/pz r4
neg r5,r5
extu.w r5,r0
bt/s LOCAL(neg_result)
cmp/eq r5,r0
neg r4,r4
LOCAL(pos_result):
swap.w r4,r0
bra LOCAL(sdiv_check_divisor)
sts pr,r1
LOCAL(pos_divisor):
extu.w r5,r0
bt/s LOCAL(pos_result)
cmp/eq r5,r0
neg r4,r4
LOCAL(neg_result):
mova LOCAL(negate_result),r0
;
mov r0,r1
swap.w r4,r0
lds r2,macl
sts pr,r2
LOCAL(sdiv_check_divisor):
shlr16 r4
bf/s LOCAL(sdiv_large_divisor)
div0u
bra LOCAL(sdiv_small_divisor)
shll16 r5
.balign 4
LOCAL(negate_result):
neg r0,r0
jmp @r2
sts macl,r2
ENDFUNC(GLOBAL(sdivsi3_i4i))
#endif /* !__SH_FPU_DOUBLE__ */
#endif /* L_udivsi3_i4i */
#ifdef L_sdivsi3_i4i
#if defined (__SH_FPU_DOUBLE__) || defined (__SH4_SINGLE_ONLY__)
/* 48 bytes, 45 cycles on sh4-200 */
!! args in r4 and r5, result in r0, clobber r1
.global GLOBAL(sdivsi3_i4i)
FUNC(GLOBAL(sdivsi3_i4i))
GLOBAL(sdivsi3_i4i):
sts.l fpscr,@-r15
sts fpul,r1
mova L1,r0
lds.l @r0+,fpscr
lds r4,fpul
#ifdef FMOVD_WORKS
fmov.d dr0,@-r15
float fpul,dr0
lds r5,fpul
fmov.d dr2,@-r15
#else
fmov.s DR01,@-r15
fmov.s DR00,@-r15
float fpul,dr0
lds r5,fpul
fmov.s DR21,@-r15
fmov.s DR20,@-r15
#endif
float fpul,dr2
fdiv dr2,dr0
#ifdef FMOVD_WORKS
fmov.d @r15+,dr2
#else
fmov.s @r15+,DR20
fmov.s @r15+,DR21
#endif
ftrc dr0,fpul
#ifdef FMOVD_WORKS
fmov.d @r15+,dr0
#else
fmov.s @r15+,DR00
fmov.s @r15+,DR01
#endif
lds.l @r15+,fpscr
sts fpul,r0
rts
lds r1,fpul
.p2align 2
L1:
#ifndef FMOVD_WORKS
.long 0x80000
#else
.long 0x180000
#endif
ENDFUNC(GLOBAL(sdivsi3_i4i))
#endif /* __SH_FPU_DOUBLE__ */
#endif /* L_sdivsi3_i4i */
|
