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
|
/* Optimized memcpy implementation for PowerPC A2.
Copyright (C) 2010 Free Software Foundation, Inc.
Contributed by Michael Brutman <brutman@us.ibm.com>.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#include <bp-sym.h>
#include <bp-asm.h>
#define PREFETCH_AHEAD 4 /* no cache lines SRC prefetching ahead */
#define ZERO_AHEAD 2 /* no cache lines DST zeroing ahead */
.machine ppca2
EALIGN (BP_SYM (memcpy), 5, 0)
CALL_MCOUNT
dcbt 0,r4 /* Prefetch ONE SRC cacheline */
cmplwi cr1,r5,16 /* is size < 16 ? */
mr r6,r3 /* Copy dest reg to r6; */
blt+ cr1,L(shortcopy)
/* Big copy (16 bytes or more)
Figure out how far to the nearest quadword boundary, or if we are
on one already.
r3 - return value (always)
r4 - current source addr
r5 - copy length
r6 - current dest addr
*/
neg r8,r3 /* LS 4 bits = # bytes to 8-byte dest bdry */
clrlwi r8,r8,32-4 /* align to 16byte boundary */
sub r7,r4,r3 /* compute offset to src from dest */
cmplwi cr0,r8,0 /* Were we aligned on a 16 byte bdy? */
beq+ L(dst_aligned)
/* Destination is not aligned on quadword boundary. Get us to one.
r3 - return value (always)
r4 - current source addr
r5 - copy length
r6 - current dest addr
r7 - offset to src from dest
r8 - number of bytes to quadword boundary
*/
mtcrf 0x01,r8 /* put #bytes to boundary into cr7 */
subf r5,r8,r5 /* adjust remaining len */
bf cr7*4+3,1f
lbzx r0,r7,r6 /* copy 1 byte addr */
stb r0,0(r6)
addi r6,r6,1
1:
bf cr7*4+2,2f
lhzx r0,r7,r6 /* copy 2 byte addr */
sth r0,0(r6)
addi r6,r6,2
2:
bf cr7*4+1,4f
lwzx r0,r7,r6 /* copy 4 byte addr */
stw r0,0(r6)
addi r6,r6,4
4:
bf cr7*4+0,8f
lfdx r0,r7,r6 /* copy 8 byte addr */
stfd r0,0(r6)
addi r6,r6,8
8:
add r4,r7,r6 /* update src addr */
/* Dest is quadword aligned now.
Lots of decisions to make. If we are copying less than a cache
line we won't be here long. If we are not on a cache line
boundary we need to get there. And then we need to figure out
how many cache lines ahead to pre-touch.
r3 - return value (always)
r4 - current source addr
r5 - copy length
r6 - current dest addr
*/
.align 4
L(dst_aligned):
#ifdef SHARED
mflr r0
/* Establishes GOT addressability so we can load __cache_line_size
from static. This value was set from the aux vector during startup. */
bcl 20,31,1f
1:
mflr r9
addis r9,r9,__cache_line_size-1b@ha
lwz r9,__cache_line_size-1b@l(r9)
mtlr r0
#else
/* Load __cache_line_size from static. This value was set from the
aux vector during startup. */
lis r9,__cache_line_size@ha
lwz r9,__cache_line_size@l(r9)
#endif
cmplwi cr5, r9, 0
bne+ cr5,L(cachelineset)
li r9,64
L(cachelineset):
addi r10,r9,-1
cmpw cr5,r5,r10 /* Less than a cacheline to go? */
neg r7,r6 /* How far to next cacheline bdy? */
addi r6,r6,-8 /* prepare for stdu */
cmpwi cr0,r9,128
addi r4,r4,-8 /* prepare for ldu */
ble+ cr5,L(lessthancacheline)
beq- cr0,L(big_lines) /* 128 byte line code */
/* More than a cacheline left to go, and using 64 byte cachelines */
clrlwi r7,r7,32-6 /* How far to next cacheline bdy? */
cmplwi cr6,r7,0 /* Are we on a cacheline bdy already? */
/* Reduce total len by what it takes to get to the next cache line */
subf r5,r7,r5
srwi r7,r7,4 /* How many qws to get to the line bdy? */
/* How many full cache lines to copy after getting to a line bdy? */
srwi r10,r5,6
cmplwi r10,0 /* If no full cache lines to copy ... */
li r11,0 /* number cachelines to copy with prefetch */
beq L(nocacheprefetch)
/* We are here because we have at least one full cache line to copy,
and therefore some pre-touching to do. */
cmplwi r10,PREFETCH_AHEAD
li r12,64+8 /* prefetch distance */
ble L(lessthanmaxprefetch)
/* We can only do so much pre-fetching. R11 will have the count of
lines left to prefetch after the initial batch of prefetches
are executed. */
subi r11,r10,PREFETCH_AHEAD
li r10,PREFETCH_AHEAD
L(lessthanmaxprefetch):
mtctr r10
/* At this point r10/ctr hold the number of lines to prefetch in this
initial batch, and r11 holds any remainder. */
L(prefetchSRC):
dcbt r12,r4
addi r12,r12,64
bdnz L(prefetchSRC)
/* Prefetching is done, or was not needed.
cr6 - are we on a cacheline boundary already?
r7 - number of quadwords to the next cacheline boundary
*/
L(nocacheprefetch):
mtctr r7
cmplwi cr1,r5,64 /* Less than a cache line to copy? */
/* How many bytes are left after we copy whatever full
cache lines we can get? */
clrlwi r5,r5,32-6
beq cr6,L(cachelinealigned)
/* Copy quadwords up to the next cacheline boundary */
L(aligntocacheline):
lfd fp9,0x08(r4)
lfdu fp10,0x10(r4)
stfd fp9,0x08(r6)
stfdu fp10,0x10(r6)
bdnz L(aligntocacheline)
.align 4
L(cachelinealigned): /* copy while cache lines */
blt- cr1,L(lessthancacheline) /* size <64 */
L(outerloop):
cmpwi r11,0
mtctr r11
beq- L(endloop)
li r11,64*ZERO_AHEAD +8 /* DCBZ dist */
.align 4
/* Copy whole cachelines, optimized by prefetching SRC cacheline */
L(loop): /* Copy aligned body */
dcbt r12,r4 /* PREFETCH SOURCE some cache lines ahead */
lfd fp9, 0x08(r4)
dcbz r11,r6
lfd fp10, 0x10(r4)
lfd fp11, 0x18(r4)
lfd fp12, 0x20(r4)
stfd fp9, 0x08(r6)
stfd fp10, 0x10(r6)
stfd fp11, 0x18(r6)
stfd fp12, 0x20(r6)
lfd fp9, 0x28(r4)
lfd fp10, 0x30(r4)
lfd fp11, 0x38(r4)
lfdu fp12, 0x40(r4)
stfd fp9, 0x28(r6)
stfd fp10, 0x30(r6)
stfd fp11, 0x38(r6)
stfdu fp12, 0x40(r6)
bdnz L(loop)
L(endloop):
cmpwi r10,0
beq- L(endloop2)
mtctr r10
L(loop2): /* Copy aligned body */
lfd fp9, 0x08(r4)
lfd fp10, 0x10(r4)
lfd fp11, 0x18(r4)
lfd fp12, 0x20(r4)
stfd fp9, 0x08(r6)
stfd fp10, 0x10(r6)
stfd fp11, 0x18(r6)
stfd fp12, 0x20(r6)
lfd fp9, 0x28(r4)
lfd fp10, 0x30(r4)
lfd fp11, 0x38(r4)
lfdu fp12, 0x40(r4)
stfd fp9, 0x28(r6)
stfd fp10, 0x30(r6)
stfd fp11, 0x38(r6)
stfdu fp12, 0x40(r6)
bdnz L(loop2)
L(endloop2):
.align 4
L(lessthancacheline): /* Was there less than cache to do ? */
cmplwi cr0,r5,16
srwi r7,r5,4 /* divide size by 16 */
blt- L(do_lt16)
mtctr r7
L(copy_remaining):
lfd fp9, 0x08(r4)
lfdu fp10, 0x10(r4)
stfd fp9, 0x08(r6)
stfdu fp10, 0x10(r6)
bdnz L(copy_remaining)
L(do_lt16): /* less than 16 ? */
cmplwi cr0,r5,0 /* copy remaining bytes (0-15) */
beqlr+ /* no rest to copy */
addi r4,r4,8
addi r6,r6,8
L(shortcopy): /* SIMPLE COPY to handle size =< 15 bytes */
mtcrf 0x01,r5
sub r7,r4,r6
bf- cr7*4+0,8f
lfdx fp9,r7,r6 /* copy 8 byte */
stfd fp9,0(r6)
addi r6,r6,8
8:
bf cr7*4+1,4f
lwzx r0,r7,r6 /* copy 4 byte */
stw r0,0(r6)
addi r6,r6,4
4:
bf cr7*4+2,2f
lhzx r0,r7,r6 /* copy 2 byte */
sth r0,0(r6)
addi r6,r6,2
2:
bf cr7*4+3,1f
lbzx r0,r7,r6 /* copy 1 byte */
stb r0,0(r6)
1:
blr
/* Similar to above, but for use with 128 byte lines. */
L(big_lines):
clrlwi r7,r7,32-7 /* How far to next cacheline bdy? */
cmplwi cr6,r7,0 /* Are we on a cacheline bdy already? */
/* Reduce total len by what it takes to get to the next cache line */
subf r5,r7,r5
srwi r7,r7,4 /* How many qw to get to the line bdy? */
/* How many full cache lines to copy after getting to a line bdy? */
srwi r10,r5,7
cmplwi r10,0 /* If no full cache lines to copy ... */
li r11,0 /* number cachelines to copy with prefetch */
beq L(nocacheprefetch_128)
/* We are here because we have at least one full cache line to copy,
and therefore some pre-touching to do. */
cmplwi r10,PREFETCH_AHEAD
li r12,128+8 /* prefetch distance */
ble L(lessthanmaxprefetch_128)
/* We can only do so much pre-fetching. R11 will have the count of
lines left to prefetch after the initial batch of prefetches
are executed. */
subi r11,r10,PREFETCH_AHEAD
li r10,PREFETCH_AHEAD
L(lessthanmaxprefetch_128):
mtctr r10
/* At this point r10/ctr hold the number of lines to prefetch in this
initial batch, and r11 holds any remainder. */
L(prefetchSRC_128):
dcbt r12,r4
addi r12,r12,128
bdnz L(prefetchSRC_128)
/* Prefetching is done, or was not needed.
cr6 - are we on a cacheline boundary already?
r7 - number of quadwords to the next cacheline boundary
*/
L(nocacheprefetch_128):
mtctr r7
cmplwi cr1,r5,128 /* Less than a cache line to copy? */
/* How many bytes are left after we copy whatever full
cache lines we can get? */
clrlwi r5,r5,32-7
beq cr6,L(cachelinealigned_128)
/* Copy quadwords up to the next cacheline boundary */
L(aligntocacheline_128):
lfd fp9,0x08(r4)
lfdu fp10,0x10(r4)
stfd fp9,0x08(r6)
stfdu fp10,0x10(r6)
bdnz L(aligntocacheline_128)
L(cachelinealigned_128): /* copy while cache lines */
blt- cr1,L(lessthancacheline) /* size <128 */
L(outerloop_128):
cmpwi r11,0
mtctr r11
beq- L(endloop_128)
li r11,128*ZERO_AHEAD +8 /* DCBZ dist */
.align 4
/* Copy whole cachelines, optimized by prefetching SRC cacheline */
L(loop_128): /* Copy aligned body */
dcbt r12,r4 /* PREFETCH SOURCE some cache lines ahead */
lfd fp9, 0x08(r4)
dcbz r11,r6
lfd fp10, 0x10(r4)
lfd fp11, 0x18(r4)
lfd fp12, 0x20(r4)
stfd fp9, 0x08(r6)
stfd fp10, 0x10(r6)
stfd fp11, 0x18(r6)
stfd fp12, 0x20(r6)
lfd fp9, 0x28(r4)
lfd fp10, 0x30(r4)
lfd fp11, 0x38(r4)
lfd fp12, 0x40(r4)
stfd fp9, 0x28(r6)
stfd fp10, 0x30(r6)
stfd fp11, 0x38(r6)
stfd fp12, 0x40(r6)
lfd fp9, 0x48(r4)
lfd fp10, 0x50(r4)
lfd fp11, 0x58(r4)
lfd fp12, 0x60(r4)
stfd fp9, 0x48(r6)
stfd fp10, 0x50(r6)
stfd fp11, 0x58(r6)
stfd fp12, 0x60(r6)
lfd fp9, 0x68(r4)
lfd fp10, 0x70(r4)
lfd fp11, 0x78(r4)
lfdu fp12, 0x80(r4)
stfd fp9, 0x68(r6)
stfd fp10, 0x70(r6)
stfd fp11, 0x78(r6)
stfdu fp12, 0x80(r6)
bdnz L(loop_128)
L(endloop_128):
cmpwi r10,0
beq- L(endloop2_128)
mtctr r10
L(loop2_128): /* Copy aligned body */
lfd fp9, 0x08(r4)
lfd fp10, 0x10(r4)
lfd fp11, 0x18(r4)
lfd fp12, 0x20(r4)
stfd fp9, 0x08(r6)
stfd fp10, 0x10(r6)
stfd fp11, 0x18(r6)
stfd fp12, 0x20(r6)
lfd fp9, 0x28(r4)
lfd fp10, 0x30(r4)
lfd fp11, 0x38(r4)
lfd fp12, 0x40(r4)
stfd fp9, 0x28(r6)
stfd fp10, 0x30(r6)
stfd fp11, 0x38(r6)
stfd fp12, 0x40(r6)
lfd fp9, 0x48(r4)
lfd fp10, 0x50(r4)
lfd fp11, 0x58(r4)
lfd fp12, 0x60(r4)
stfd fp9, 0x48(r6)
stfd fp10, 0x50(r6)
stfd fp11, 0x58(r6)
stfd fp12, 0x60(r6)
lfd fp9, 0x68(r4)
lfd fp10, 0x70(r4)
lfd fp11, 0x78(r4)
lfdu fp12, 0x80(r4)
stfd fp9, 0x68(r6)
stfd fp10, 0x70(r6)
stfd fp11, 0x78(r6)
stfdu fp12, 0x80(r6)
bdnz L(loop2_128)
L(endloop2_128):
b L(lessthancacheline)
END (BP_SYM (memcpy))
libc_hidden_builtin_def (memcpy)
|
