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comparison gcc/config/score/mul-div.S @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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-1:000000000000 0:a06113de4d67
1 /* Copyright (C) 2005, 2007 Free Software Foundation, Inc.
2 Contributed by Sunnorth
3
4 This file is part of GCC.
5
6 GCC is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published
8 by the Free Software Foundation; either version 3, or (at your
9 option) any later version.
10
11 GCC is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
14 License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
19
20 #define ra r3
21 #define a0 r4
22 #define a1 r5
23 #define a2 r6
24 #define a3 r7
25 #define v0 r23
26
27 #define t0 r8
28 #define t1 r9
29 #define t2 r10
30 #define t3 r11
31 #define t4 r22
32
33 #ifndef __pic__
34 #if !defined(L_mulsi3) && !defined(L_divsi3)
35 .text
36 .global _flush_cache
37 #ifdef __score3__
38 _flush_cache:
39 br r3
40 #else
41 _flush_cache:
42 srli r9, r5, 4
43 mv r8, r4
44 mtsr r9, sr0
45 1:
46 cache 0xe, [r8, 0] # write back invalid dcache
47 addi r8, 16
48 bcnz 1b
49 mfcr r8, cr4
50 bittst! r8, 0x3 # if LDM is enable, write back LDM
51 beq! 6f
52 ldi r10, 0
53 cache 0xc, [r10, 0]
54 6:
55 bittst! r8, 0x2 # if LIM is enable, refill it
56 beq! 7f
57 cache 0x4, [r10, 0]
58 7:
59 #nop!
60 #nop!
61 #nop!
62 #nop!
63 #nop!
64 mv r8, r4
65 mtsr r9, sr0
66 2:
67 cache 0x2, [r8, 0] # invalid unlock icache
68 #nop!
69 #nop!
70 #nop!
71 #nop!
72 #nop!
73 addi r8, 16
74 bcnz 2b
75 br r3
76 #endif
77 #endif
78
79 /* FUNCTION
80 (U) INT32 v0 = __mulsi3 ((U) INT32 a0, (U) INT32 a1);
81 REGISTERS:
82 use t0
83 modify a0
84 a1 -> become 0
85 NOTE:
86 this seems to give better performance to just rotate and add. */
87
88 #ifdef L_mulsi3
89 .text
90 .global __umulsi3
91 .global __mulsi3
92 /* signed multiplication (32x32) */
93 .ent __mulsi3
94 __umulsi3:
95 __mulsi3:
96 li t1, 0
97 __mulsi3_loop:
98 andri.c t0, a1, 1 # t0 = multiplier[0]
99 srli a1, a1, 1 # a1 /= 2
100 beq __mulsi3_loop2 # skip if (t0 == 0)
101 add t1, t1, a0 # add multiplicand
102 __mulsi3_loop2:
103 slli a0, a0, 1 # multiplicand mul 2
104 cmpi.c a1, 0
105 bne __mulsi3_loop
106 mv r4, t1
107 br ra
108 .end __mulsi3
109 #endif /* L_mulsi3 */
110
111 /* FUNCTION
112 UINT32 (v0) = __udivsi3 (UINT32 (a0), UINT32 (a1));
113 INT32 (v0) = __divsi3 (INT32 (a0), INT32 (a1));
114 UINT32 (v0) = __umodsi3 (UINT32 (a0), UINT32 (a1));
115 INT32 (v0) = __modsi3 (INT32 (a0), INT32 (a1));
116 DESCRIPTION
117 performs 32-bit division/modulo.
118 REGISTERS
119 used t0 bit-index
120 t1
121 modify a0 becomes remainer */
122 #ifdef L_divsi3
123 .text
124 .global __udivsi3
125 .global __umodsi3
126 .global __divsi3
127 .global __modsi3
128
129 /* unsigned division */
130 .ent __udivsi3
131 __udivsi3:
132 li t4, 0
133 cmpi.c a1, 0
134 beq __uds_exit
135 li t0, 1
136 blt __uds_ok
137 __uds_normalize:
138 cmp.c a0, a1
139 bcc __uds_ok
140 slli a1, a1, 1
141 slli t0, t0, 1
142 cmpi.c a1, 0
143 bge __uds_normalize
144 __uds_ok:
145 __uds_loop2:
146 cmp.c a0, a1
147 bcc __uds_loop3
148 sub a0, a0, a1
149 or t4, t4, t0
150 __uds_loop3:
151 srli t0, t0, 1
152 srli a1, a1, 1
153 cmpi.c t0, 0
154 bne __uds_loop2
155 __uds_exit:
156 mv a1, a0
157 mv r4, t4
158 br ra
159 .end __udivsi3
160
161 /* unsigned modulus */
162 .ent __umodsi3
163 __umodsi3:
164 mv t3, ra
165 jl __udivsi3
166 mv r4, a1
167 br t3
168 .end __umodsi3
169
170 /* abs and div */
171 .ent __orgsi3
172 __orgsi3:
173 cmpi.c a0, 0
174 bge __orgsi3_a0p
175 neg a0, a0
176 __orgsi3_a0p:
177 cmpi.c a1, 0
178 bge __udivsi3
179 neg a1, a1
180 b __udivsi3 # goto udivsi3
181 .end __orgsi3
182
183 /* signed division */
184 .ent __divsi3
185 __divsi3:
186 mv t3, ra
187 xor t2, a0, a1
188 jl __orgsi3
189 __divsi3_adjust:
190 cmpi.c t2, 0
191 bge __divsi3_exit
192 neg r4, r4
193 __divsi3_exit:
194 br t3
195 .end __divsi3
196
197 /* signed modulus */
198 .ent __modsi3
199 __modsi3:
200 mv t3, ra
201 mv t2, a0
202 jl __orgsi3
203 mv r4, a1
204 b __divsi3_adjust
205 .end __modsi3
206
207 #endif /* L_divsi3 */
208 #else /* -fPIC */
209 #if !defined(L_mulsi3) && !defined(L_divsi3)
210 .set pic
211 .text
212 .global _flush_cache
213 #ifdef __score3__
214 _flush_cache:
215 br r3
216 #else
217 _flush_cache:
218 addi r0, -8 # pic used
219 .cpload r29 # pic used
220 srli r9, r5, 4
221 mv r8, r4
222 mtsr r9, sr0
223 1:
224 cache 0xe, [r8, 0] # write back invalid dcache
225 addi r8, 16
226 bcnz 1b
227 mfcr r8, cr4
228 bittst! r8, 0x3 # if LDM is enable, write back LDM
229 beq! 6f
230 ldi r10, 0
231 cache 0xc, [r10, 0]
232 6:
233 bittst! r8, 0x2 # if LIM is enable, refill it
234 beq! 7f
235 cache 0x4, [r10, 0]
236 7:
237 #nop!
238 #nop!
239 #nop!
240 #nop!
241 #nop!
242 mv r8, r4
243 mtsr r9, sr0
244 2:
245 cache 0x2, [r8, 0] # invalid unlock icache
246 #nop!
247 #nop!
248 #nop!
249 #nop!
250 #nop!
251 addi r8, 16
252 bcnz 2b
253 .cprestore r0, 12 # pic used
254 addi r0, 8 # pic used
255 br r3
256 #endif
257 #endif
258
259 /* FUNCTION
260 (U) INT32 v0 = __mulsi3 ((U) INT32 a0, (U) INT32 a1);
261 REGISTERS:
262 use t0
263 modify a0
264 a1 -> become 0
265 NOTE:
266 this seems to give better performance to just rotate and add. */
267
268 #ifdef L_mulsi3
269 .set pic
270 .text
271 .global __umulsi3
272 .global __mulsi3
273 /* signed multiplication (32x32) */
274 .ent __mulsi3
275 __umulsi3:
276 __mulsi3:
277 addi r0, -8 # pic used
278 .cpload r29 # pic used
279 li t1, 0
280 __mulsi3_loop:
281 andri.c t0, a1, 1 # t0 = multiplier[0]
282 srli a1, a1, 1 # a1 /= 2
283 beq __mulsi3_loop2 # skip if (t0 == 0)
284 add t1, t1, a0 # add multiplicand
285 __mulsi3_loop2:
286 slli a0, a0, 1 # multiplicand mul 2
287 cmpi.c a1, 0
288 bne __mulsi3_loop
289 mv r4, t1
290 .cprestore r0, 12 # pic used
291 addi r0, 8 # pic used
292 br ra
293 .end __mulsi3
294 #endif /* L_mulsi3 */
295
296 /* FUNCTION
297 UINT32 (v0) = __udivsi3 (UINT32 (a0), UINT32 (a1));
298 INT32 (v0) = __divsi3 (INT32 (a0), INT32 (a1));
299 UINT32 (v0) = __umodsi3 (UINT32 (a0), UINT32 (a1));
300 INT32 (v0) = __modsi3 (INT32 (a0), INT32 (a1));
301 DESCRIPTION
302 performs 32-bit division/modulo.
303 REGISTERS
304 used t0 bit-index
305 t1
306 modify a0 becomes remainer */
307 #ifdef L_divsi3
308 .set pic
309 .text
310 .global __udivsi3
311 .global __umodsi3
312 .global __divsi3
313 .global __modsi3
314
315 /* unsigned division */
316 .ent __udivsi3
317 __udivsi3:
318 addi r0, -8 # pic used
319 .cpload r29 # pic used
320 li t4, 0
321 cmpi.c a1, 0
322 beq __uds_exit
323 li t0, 1
324 blt __uds_ok
325 __uds_normalize:
326 cmp.c a0, a1
327 bcc __uds_ok
328 slli a1, a1, 1
329 slli t0, t0, 1
330 cmpi.c a1, 0
331 bge __uds_normalize
332 __uds_ok:
333 __uds_loop2:
334 cmp.c a0, a1
335 bcc __uds_loop3
336 sub a0, a0, a1
337 or t4, t4, t0
338 __uds_loop3:
339 srli t0, t0, 1
340 srli a1, a1, 1
341 cmpi.c t0, 0
342 bne __uds_loop2
343 __uds_exit:
344 mv a1, a0
345 mv r4, t4
346 .cprestore r0, 12 # pic used
347 addi r0, 8 # pic used
348 br ra
349 .end __udivsi3
350
351 /* unsigned modulus */
352 .ent __umodsi3
353 __umodsi3:
354 addi r0, -8 # pic used
355 .cpload r29 # pic used
356 li t1, 0
357 mv t3, ra
358 la r29, __udivsi3
359 brl r29
360 mv r4, a1
361 .cprestore r0, 12 # pic used
362 addi r0, 8 # pic used
363 br t3
364 .end __umodsi3
365
366 /* abs and div */
367 .ent __orgsi3
368 __orgsi3:
369 cmpi.c a0, 0
370 bge __orgsi3_a0p
371 neg a0, a0
372 __orgsi3_a0p:
373 cmpi.c a1, 0
374 bge __udivsi3
375 neg a1, a1
376 b __udivsi3 # goto udivsi3
377 .end __orgsi3
378
379 /* signed division */
380 .ent __divsi3
381 __divsi3:
382 addi r0, -8 # pic used
383 .cpload r29 # pic used
384 mv t3, ra
385 xor t2, a0, a1
386 la r29, __orgsi3
387 brl r29
388 __divsi3_adjust:
389 cmpi.c t2, 0
390 bge __divsi3_exit
391 neg r4, r4
392 __divsi3_exit:
393 .cprestore r0, 12 # pic used
394 addi r0, 8 # pic used
395 br t3
396 .end __divsi3
397
398 /* signed modulus */
399 .ent __modsi3
400 __modsi3:
401 addi r0, -8 # pic used
402 .cpload r29 # pic used
403 mv t3, ra
404 mv t2, a0
405 la r29, __orgsi3
406 brl r29
407 mv r4, a1
408 b __divsi3_adjust
409 .end __modsi3
410
411 #endif /*L_divsi3 */
412 #endif