1 /*
2 * M7memcpy: Optimized SPARC M7 memcpy
3 *
4 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
5 */
6
7 .file "M7memcpy.S"
8
9 /*
10 * memcpy(s1, s2, len)
11 *
12 * Copy s2 to s1, always copy n bytes.
13 * Note: this C code does not work for overlapped copies.
14 *
15 * Fast assembler language version of the following C-program for memcpy
16 * which represents the `standard' for the C-library.
17 *
18 * void *
19 * memcpy(void *s, const void *s0, size_t n)
20 * {
21 * if (n != 0) {
22 * char *s1 = s;
23 * const char *s2 = s0;
24 * do {
25 * *s1++ = *s2++;
26 * } while (--n != 0);
27 * }
28 * return (s);
29 * }
30 *
31 *
32 * SPARC T7/M7 Flow :
33 *
34 * if (count < SMALL_MAX) {
35 * if count < SHORTCOPY (SHORTCOPY=3)
36 * copy bytes; exit with dst addr
37 * if src & dst aligned on word boundary but not long word boundary,
38 * copy with ldw/stw; branch to finish_up
39 * if src & dst aligned on long word boundary
40 * copy with ldx/stx; branch to finish_up
41 * if src & dst not aligned and length <= SHORTCHECK (SHORTCHECK=14)
42 * copy bytes; exit with dst addr
43 * move enough bytes to get src to word boundary
44 * if dst now on word boundary
45 * move_words:
46 * copy words; branch to finish_up
47 * if dst now on half word boundary
48 * load words, shift half words, store words; branch to finish_up
49 * if dst on byte 1
50 * load words, shift 3 bytes, store words; branch to finish_up
51 * if dst on byte 3
52 * load words, shift 1 byte, store words; branch to finish_up
53 * finish_up:
54 * copy bytes; exit with dst addr
55 * } else { More than SMALL_MAX bytes
56 * move bytes until dst is on long word boundary
57 * if( src is on long word boundary ) {
58 * if (count < MED_MAX) {
59 * finish_long: src/dst aligned on 8 bytes
60 * copy with ldx/stx in 8-way unrolled loop;
61 * copy final 0-63 bytes; exit with dst addr
62 * } else { src/dst aligned; count > MED_MAX
63 * align dst on 64 byte boundary; for main data movement:
64 * prefetch src data to L2 cache; let HW prefetch move data to L1 cache
65 * Use BIS (block initializing store) to avoid copying store cache
66 * lines from memory. But pre-store first element of each cache line
67 * ST_CHUNK lines in advance of the rest of that cache line. That
68 * gives time for replacement cache lines to be written back without
69 * excess STQ and Miss Buffer filling. Repeat until near the end,
70 * then finish up storing before going to finish_long.
71 * }
72 * } else { src/dst not aligned on 8 bytes
73 * if src is word aligned and count < MED_WMAX
74 * move words in 8-way unrolled loop
75 * move final 0-31 bytes; exit with dst addr
76 * if count < MED_UMAX
77 * use alignaddr/faligndata combined with ldd/std in 8-way
78 * unrolled loop to move data.
79 * go to unalign_done
80 * else
81 * setup alignaddr for faligndata instructions
82 * align dst on 64 byte boundary; prefetch src data to L1 cache
83 * loadx8, falign, block-store, prefetch loop
84 * (only use block-init-store when src/dst on 8 byte boundaries.)
85 * unalign_done:
86 * move remaining bytes for unaligned cases. exit with dst addr.
87 * }
88 *
89 */
90
91 #include <asm/visasm.h>
92 #include <asm/asi.h>
93
94 #if !defined(EX_LD) && !defined(EX_ST)
95 #define NON_USER_COPY
96 #endif
97
98 #ifndef EX_LD
99 #define EX_LD(x,y) x
100 #endif
101 #ifndef EX_LD_FP
102 #define EX_LD_FP(x,y) x
103 #endif
104
105 #ifndef EX_ST
106 #define EX_ST(x,y) x
107 #endif
108 #ifndef EX_ST_FP
109 #define EX_ST_FP(x,y) x
110 #endif
111
112 #ifndef EX_RETVAL
113 #define EX_RETVAL(x) x
114 #endif
115
116 #ifndef LOAD
117 #define LOAD(type,addr,dest) type [addr], dest
118 #endif
119
120 #ifndef STORE
121 #define STORE(type,src,addr) type src, [addr]
122 #endif
123
124 /*
125 * ASI_BLK_INIT_QUAD_LDD_P/ASI_BLK_INIT_QUAD_LDD_S marks the cache
126 * line as "least recently used" which means if many threads are
127 * active, it has a high probability of being pushed out of the cache
128 * between the first initializing store and the final stores.
129 * Thus, we use ASI_ST_BLKINIT_MRU_P/ASI_ST_BLKINIT_MRU_S which
130 * marks the cache line as "most recently used" for all
131 * but the last cache line
132 */
133 #ifndef STORE_ASI
134 #ifndef SIMULATE_NIAGARA_ON_NON_NIAGARA
135 #define STORE_ASI ASI_BLK_INIT_QUAD_LDD_P
136 #else
137 #define STORE_ASI 0x80 /* ASI_P */
138 #endif
139 #endif
140
141 #ifndef STORE_MRU_ASI
142 #ifndef SIMULATE_NIAGARA_ON_NON_NIAGARA
143 #define STORE_MRU_ASI ASI_ST_BLKINIT_MRU_P
144 #else
145 #define STORE_MRU_ASI 0x80 /* ASI_P */
146 #endif
147 #endif
148
149 #ifndef STORE_INIT
150 #define STORE_INIT(src,addr) stxa src, [addr] STORE_ASI
151 #endif
152
153 #ifndef STORE_INIT_MRU
154 #define STORE_INIT_MRU(src,addr) stxa src, [addr] STORE_MRU_ASI
155 #endif
156
157 #ifndef FUNC_NAME
158 #define FUNC_NAME M7memcpy
159 #endif
160
161 #ifndef PREAMBLE
162 #define PREAMBLE
163 #endif
164
165 #define BLOCK_SIZE 64
166 #define SHORTCOPY 3
167 #define SHORTCHECK 14
168 #define SHORT_LONG 64 /* max copy for short longword-aligned case */
169 /* must be at least 64 */
170 #define SMALL_MAX 128
171 #define MED_UMAX 1024 /* max copy for medium un-aligned case */
172 #define MED_WMAX 1024 /* max copy for medium word-aligned case */
173 #define MED_MAX 1024 /* max copy for medium longword-aligned case */
174 #define ST_CHUNK 24 /* ST_CHUNK - block of values for BIS Store */
175 #define ALIGN_PRE 24 /* distance for aligned prefetch loop */
176
177 .register %g2,#scratch
178
179 .section ".text"
180 .global FUNC_NAME
181 .type FUNC_NAME, #function
182 .align 16
183 FUNC_NAME:
184 srlx %o2, 31, %g2
185 cmp %g2, 0
186 tne %xcc, 5
187 PREAMBLE
188 mov %o0, %g1 ! save %o0
189 brz,pn %o2, .Lsmallx
190 cmp %o2, 3
191 ble,pn %icc, .Ltiny_cp
192 cmp %o2, 19
193 ble,pn %icc, .Lsmall_cp
194 or %o0, %o1, %g2
195 cmp %o2, SMALL_MAX
196 bl,pn %icc, .Lmedium_cp
197 nop
198
199 .Lmedium:
200 neg %o0, %o5
201 andcc %o5, 7, %o5 ! bytes till DST 8 byte aligned
202 brz,pt %o5, .Ldst_aligned_on_8
203
204 ! %o5 has the bytes to be written in partial store.
205 sub %o2, %o5, %o2
206 sub %o1, %o0, %o1 ! %o1 gets the difference
207 7: ! dst aligning loop
208 add %o1, %o0, %o4
209 EX_LD(LOAD(ldub, %o4, %o4), memcpy_retl_o2_plus_o5) ! load one byte
210 subcc %o5, 1, %o5
211 EX_ST(STORE(stb, %o4, %o0), memcpy_retl_o2_plus_o5_plus_1)
212 bgu,pt %xcc, 7b
213 add %o0, 1, %o0 ! advance dst
214 add %o1, %o0, %o1 ! restore %o1
215 .Ldst_aligned_on_8:
216 andcc %o1, 7, %o5
217 brnz,pt %o5, .Lsrc_dst_unaligned_on_8
218 nop
219
220 .Lsrc_dst_aligned_on_8:
221 ! check if we are copying MED_MAX or more bytes
222 set MED_MAX, %o3
223 cmp %o2, %o3 ! limit to store buffer size
224 bgu,pn %xcc, .Llarge_align8_copy
225 nop
226
227 /*
228 * Special case for handling when src and dest are both long word aligned
229 * and total data to move is less than MED_MAX bytes
230 */
231 .Lmedlong:
232 subcc %o2, 63, %o2 ! adjust length to allow cc test
233 ble,pn %xcc, .Lmedl63 ! skip big loop if less than 64 bytes
234 nop
235 .Lmedl64:
236 EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2_plus_63) ! load
237 subcc %o2, 64, %o2 ! decrement length count
238 EX_ST(STORE(stx, %o4, %o0), memcpy_retl_o2_plus_63_64) ! and store
239 EX_LD(LOAD(ldx, %o1+8, %o3), memcpy_retl_o2_plus_63_56) ! a block of 64
240 EX_ST(STORE(stx, %o3, %o0+8), memcpy_retl_o2_plus_63_56)
241 EX_LD(LOAD(ldx, %o1+16, %o4), memcpy_retl_o2_plus_63_48)
242 EX_ST(STORE(stx, %o4, %o0+16), memcpy_retl_o2_plus_63_48)
243 EX_LD(LOAD(ldx, %o1+24, %o3), memcpy_retl_o2_plus_63_40)
244 EX_ST(STORE(stx, %o3, %o0+24), memcpy_retl_o2_plus_63_40)
245 EX_LD(LOAD(ldx, %o1+32, %o4), memcpy_retl_o2_plus_63_32)! load and store
246 EX_ST(STORE(stx, %o4, %o0+32), memcpy_retl_o2_plus_63_32)
247 EX_LD(LOAD(ldx, %o1+40, %o3), memcpy_retl_o2_plus_63_24)! a block of 64
248 add %o1, 64, %o1 ! increase src ptr by 64
249 EX_ST(STORE(stx, %o3, %o0+40), memcpy_retl_o2_plus_63_24)
250 EX_LD(LOAD(ldx, %o1-16, %o4), memcpy_retl_o2_plus_63_16)
251 add %o0, 64, %o0 ! increase dst ptr by 64
252 EX_ST(STORE(stx, %o4, %o0-16), memcpy_retl_o2_plus_63_16)
253 EX_LD(LOAD(ldx, %o1-8, %o3), memcpy_retl_o2_plus_63_8)
254 bgu,pt %xcc, .Lmedl64 ! repeat if at least 64 bytes left
255 EX_ST(STORE(stx, %o3, %o0-8), memcpy_retl_o2_plus_63_8)
256 .Lmedl63:
257 addcc %o2, 32, %o2 ! adjust remaining count
258 ble,pt %xcc, .Lmedl31 ! to skip if 31 or fewer bytes left
259 nop
260 EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2_plus_31) ! load
261 sub %o2, 32, %o2 ! decrement length count
262 EX_ST(STORE(stx, %o4, %o0), memcpy_retl_o2_plus_31_32) ! and store
263 EX_LD(LOAD(ldx, %o1+8, %o3), memcpy_retl_o2_plus_31_24) ! a block of 32
264 add %o1, 32, %o1 ! increase src ptr by 32
265 EX_ST(STORE(stx, %o3, %o0+8), memcpy_retl_o2_plus_31_24)
266 EX_LD(LOAD(ldx, %o1-16, %o4), memcpy_retl_o2_plus_31_16)
267 add %o0, 32, %o0 ! increase dst ptr by 32
268 EX_ST(STORE(stx, %o4, %o0-16), memcpy_retl_o2_plus_31_16)
269 EX_LD(LOAD(ldx, %o1-8, %o3), memcpy_retl_o2_plus_31_8)
270 EX_ST(STORE(stx, %o3, %o0-8), memcpy_retl_o2_plus_31_8)
271 .Lmedl31:
272 addcc %o2, 16, %o2 ! adjust remaining count
273 ble,pt %xcc, .Lmedl15 ! skip if 15 or fewer bytes left
274 nop !
275 EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2_plus_15)
276 add %o1, 16, %o1 ! increase src ptr by 16
277 EX_ST(STORE(stx, %o4, %o0), memcpy_retl_o2_plus_15)
278 sub %o2, 16, %o2 ! decrease count by 16
279 EX_LD(LOAD(ldx, %o1-8, %o3), memcpy_retl_o2_plus_15_8)
280 add %o0, 16, %o0 ! increase dst ptr by 16
281 EX_ST(STORE(stx, %o3, %o0-8), memcpy_retl_o2_plus_15_8)
282 .Lmedl15:
283 addcc %o2, 15, %o2 ! restore count
284 bz,pt %xcc, .Lsmallx ! exit if finished
285 cmp %o2, 8
286 blt,pt %xcc, .Lmedw7 ! skip if 7 or fewer bytes left
287 tst %o2
288 EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2) ! load 8 bytes
289 add %o1, 8, %o1 ! increase src ptr by 8
290 add %o0, 8, %o0 ! increase dst ptr by 8
291 subcc %o2, 8, %o2 ! decrease count by 8
292 bnz,pn %xcc, .Lmedw7
293 EX_ST(STORE(stx, %o4, %o0-8), memcpy_retl_o2_plus_8) ! and store 8
294 retl
295 mov EX_RETVAL(%g1), %o0 ! restore %o0
296
297 .align 16
298 .Lsrc_dst_unaligned_on_8:
299 ! DST is 8-byte aligned, src is not
300 2:
301 andcc %o1, 0x3, %o5 ! test word alignment
302 bnz,pt %xcc, .Lunalignsetup ! branch to skip if not word aligned
303 nop
304
305 /*
306 * Handle all cases where src and dest are aligned on word
307 * boundaries. Use unrolled loops for better performance.
308 * This option wins over standard large data move when
309 * source and destination is in cache for.Lmedium
310 * to short data moves.
311 */
312 set MED_WMAX, %o3
313 cmp %o2, %o3 ! limit to store buffer size
314 bge,pt %xcc, .Lunalignrejoin ! otherwise rejoin main loop
315 nop
316
317 subcc %o2, 31, %o2 ! adjust length to allow cc test
318 ! for end of loop
319 ble,pt %xcc, .Lmedw31 ! skip big loop if less than 16
320 .Lmedw32:
321 EX_LD(LOAD(ld, %o1, %o4), memcpy_retl_o2_plus_31)! move a block of 32
322 sllx %o4, 32, %o5
323 EX_LD(LOAD(ld, %o1+4, %o4), memcpy_retl_o2_plus_31)
324 or %o4, %o5, %o5
325 EX_ST(STORE(stx, %o5, %o0), memcpy_retl_o2_plus_31)
326 subcc %o2, 32, %o2 ! decrement length count
327 EX_LD(LOAD(ld, %o1+8, %o4), memcpy_retl_o2_plus_31_24)
328 sllx %o4, 32, %o5
329 EX_LD(LOAD(ld, %o1+12, %o4), memcpy_retl_o2_plus_31_24)
330 or %o4, %o5, %o5
331 EX_ST(STORE(stx, %o5, %o0+8), memcpy_retl_o2_plus_31_24)
332 add %o1, 32, %o1 ! increase src ptr by 32
333 EX_LD(LOAD(ld, %o1-16, %o4), memcpy_retl_o2_plus_31_16)
334 sllx %o4, 32, %o5
335 EX_LD(LOAD(ld, %o1-12, %o4), memcpy_retl_o2_plus_31_16)
336 or %o4, %o5, %o5
337 EX_ST(STORE(stx, %o5, %o0+16), memcpy_retl_o2_plus_31_16)
338 add %o0, 32, %o0 ! increase dst ptr by 32
339 EX_LD(LOAD(ld, %o1-8, %o4), memcpy_retl_o2_plus_31_8)
340 sllx %o4, 32, %o5
341 EX_LD(LOAD(ld, %o1-4, %o4), memcpy_retl_o2_plus_31_8)
342 or %o4, %o5, %o5
343 bgu,pt %xcc, .Lmedw32 ! repeat if at least 32 bytes left
344 EX_ST(STORE(stx, %o5, %o0-8), memcpy_retl_o2_plus_31_8)
345 .Lmedw31:
346 addcc %o2, 31, %o2 ! restore count
347
348 bz,pt %xcc, .Lsmallx ! exit if finished
349 nop
350 cmp %o2, 16
351 blt,pt %xcc, .Lmedw15
352 nop
353 EX_LD(LOAD(ld, %o1, %o4), memcpy_retl_o2)! move a block of 16 bytes
354 sllx %o4, 32, %o5
355 subcc %o2, 16, %o2 ! decrement length count
356 EX_LD(LOAD(ld, %o1+4, %o4), memcpy_retl_o2_plus_16)
357 or %o4, %o5, %o5
358 EX_ST(STORE(stx, %o5, %o0), memcpy_retl_o2_plus_16)
359 add %o1, 16, %o1 ! increase src ptr by 16
360 EX_LD(LOAD(ld, %o1-8, %o4), memcpy_retl_o2_plus_8)
361 add %o0, 16, %o0 ! increase dst ptr by 16
362 sllx %o4, 32, %o5
363 EX_LD(LOAD(ld, %o1-4, %o4), memcpy_retl_o2_plus_8)
364 or %o4, %o5, %o5
365 EX_ST(STORE(stx, %o5, %o0-8), memcpy_retl_o2_plus_8)
366 .Lmedw15:
367 bz,pt %xcc, .Lsmallx ! exit if finished
368 cmp %o2, 8
369 blt,pn %xcc, .Lmedw7 ! skip if 7 or fewer bytes left
370 tst %o2
371 EX_LD(LOAD(ld, %o1, %o4), memcpy_retl_o2) ! load 4 bytes
372 subcc %o2, 8, %o2 ! decrease count by 8
373 EX_ST(STORE(stw, %o4, %o0), memcpy_retl_o2_plus_8)! and store 4 bytes
374 add %o1, 8, %o1 ! increase src ptr by 8
375 EX_LD(LOAD(ld, %o1-4, %o3), memcpy_retl_o2_plus_4) ! load 4 bytes
376 add %o0, 8, %o0 ! increase dst ptr by 8
377 EX_ST(STORE(stw, %o3, %o0-4), memcpy_retl_o2_plus_4)! and store 4 bytes
378 bz,pt %xcc, .Lsmallx ! exit if finished
379 .Lmedw7: ! count is ge 1, less than 8
380 cmp %o2, 4 ! check for 4 bytes left
381 blt,pn %xcc, .Lsmallleft3 ! skip if 3 or fewer bytes left
382 nop !
383 EX_LD(LOAD(ld, %o1, %o4), memcpy_retl_o2) ! load 4 bytes
384 add %o1, 4, %o1 ! increase src ptr by 4
385 add %o0, 4, %o0 ! increase dst ptr by 4
386 subcc %o2, 4, %o2 ! decrease count by 4
387 bnz .Lsmallleft3
388 EX_ST(STORE(stw, %o4, %o0-4), memcpy_retl_o2_plus_4)! and store 4 bytes
389 retl
390 mov EX_RETVAL(%g1), %o0
391
392 .align 16
393 .Llarge_align8_copy: ! Src and dst share 8 byte alignment
394 ! align dst to 64 byte boundary
395 andcc %o0, 0x3f, %o3 ! %o3 == 0 means dst is 64 byte aligned
396 brz,pn %o3, .Laligned_to_64
397 andcc %o0, 8, %o3 ! odd long words to move?
398 brz,pt %o3, .Laligned_to_16
399 nop
400 EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2)
401 sub %o2, 8, %o2
402 add %o1, 8, %o1 ! increment src ptr
403 add %o0, 8, %o0 ! increment dst ptr
404 EX_ST(STORE(stx, %o4, %o0-8), memcpy_retl_o2_plus_8)
405 .Laligned_to_16:
406 andcc %o0, 16, %o3 ! pair of long words to move?
407 brz,pt %o3, .Laligned_to_32
408 nop
409 EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2)
410 sub %o2, 16, %o2
411 EX_ST(STORE(stx, %o4, %o0), memcpy_retl_o2_plus_16)
412 add %o1, 16, %o1 ! increment src ptr
413 EX_LD(LOAD(ldx, %o1-8, %o4), memcpy_retl_o2_plus_8)
414 add %o0, 16, %o0 ! increment dst ptr
415 EX_ST(STORE(stx, %o4, %o0-8), memcpy_retl_o2_plus_8)
416 .Laligned_to_32:
417 andcc %o0, 32, %o3 ! four long words to move?
418 brz,pt %o3, .Laligned_to_64
419 nop
420 EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2)
421 sub %o2, 32, %o2
422 EX_ST(STORE(stx, %o4, %o0), memcpy_retl_o2_plus_32)
423 EX_LD(LOAD(ldx, %o1+8, %o4), memcpy_retl_o2_plus_24)
424 EX_ST(STORE(stx, %o4, %o0+8), memcpy_retl_o2_plus_24)
425 EX_LD(LOAD(ldx, %o1+16, %o4), memcpy_retl_o2_plus_16)
426 EX_ST(STORE(stx, %o4, %o0+16), memcpy_retl_o2_plus_16)
427 add %o1, 32, %o1 ! increment src ptr
428 EX_LD(LOAD(ldx, %o1-8, %o4), memcpy_retl_o2_plus_8)
429 add %o0, 32, %o0 ! increment dst ptr
430 EX_ST(STORE(stx, %o4, %o0-8), memcpy_retl_o2_plus_8)
431 .Laligned_to_64:
432 !
433 ! Using block init store (BIS) instructions to avoid fetching cache
434 ! lines from memory. Use ST_CHUNK stores to first element of each cache
435 ! line (similar to prefetching) to avoid overfilling STQ or miss buffers.
436 ! Gives existing cache lines time to be moved out of L1/L2/L3 cache.
437 ! Initial stores using MRU version of BIS to keep cache line in
438 ! cache until we are ready to store final element of cache line.
439 ! Then store last element using the LRU version of BIS.
440 !
441 andn %o2, 0x3f, %o5 ! %o5 is multiple of block size
442 and %o2, 0x3f, %o2 ! residue bytes in %o2
443 !
444 ! We use STORE_MRU_ASI for the first seven stores to each cache line
445 ! followed by STORE_ASI (mark as LRU) for the last store. That
446 ! mixed approach reduces the probability that the cache line is removed
447 ! before we finish setting it, while minimizing the effects on
448 ! other cached values during a large memcpy
449 !
450 ! ST_CHUNK batches up initial BIS operations for several cache lines
451 ! to allow multiple requests to not be blocked by overflowing the
452 ! the store miss buffer. Then the matching stores for all those
453 ! BIS operations are executed.
454 !
455
456 sub %o0, 8, %o0 ! adjust %o0 for ASI alignment
457 .Lalign_loop:
458 cmp %o5, ST_CHUNK*64
459 blu,pt %xcc, .Lalign_loop_fin
460 mov ST_CHUNK,%o3
461 .Lalign_loop_start:
462 prefetch [%o1 + (ALIGN_PRE * BLOCK_SIZE)], 21
463 subcc %o3, 1, %o3
464 EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2_plus_o5)
465 add %o1, 64, %o1
466 add %o0, 8, %o0
467 EX_ST(STORE_INIT_MRU(%o4, %o0), memcpy_retl_o2_plus_o5)
468 bgu %xcc,.Lalign_loop_start
469 add %o0, 56, %o0
470
471 mov ST_CHUNK,%o3
472 sllx %o3, 6, %o4 ! ST_CHUNK*64
473 sub %o1, %o4, %o1 ! reset %o1
474 sub %o0, %o4, %o0 ! reset %o0
475
476 .Lalign_loop_rest:
477 EX_LD(LOAD(ldx, %o1+8, %o4), memcpy_retl_o2_plus_o5)
478 add %o0, 16, %o0
479 EX_ST(STORE_INIT_MRU(%o4, %o0), memcpy_retl_o2_plus_o5)
480 EX_LD(LOAD(ldx, %o1+16, %o4), memcpy_retl_o2_plus_o5)
481 add %o0, 8, %o0
482 EX_ST(STORE_INIT_MRU(%o4, %o0), memcpy_retl_o2_plus_o5)
483 subcc %o3, 1, %o3
484 EX_LD(LOAD(ldx, %o1+24, %o4), memcpy_retl_o2_plus_o5)
485 add %o0, 8, %o0
486 EX_ST(STORE_INIT_MRU(%o4, %o0), memcpy_retl_o2_plus_o5)
487 EX_LD(LOAD(ldx, %o1+32, %o4), memcpy_retl_o2_plus_o5)
488 add %o0, 8, %o0
489 EX_ST(STORE_INIT_MRU(%o4, %o0), memcpy_retl_o2_plus_o5)
490 EX_LD(LOAD(ldx, %o1+40, %o4), memcpy_retl_o2_plus_o5)
491 add %o0, 8, %o0
492 EX_ST(STORE_INIT_MRU(%o4, %o0), memcpy_retl_o2_plus_o5)
493 EX_LD(LOAD(ldx, %o1+48, %o4), memcpy_retl_o2_plus_o5)
494 add %o1, 64, %o1
495 add %o0, 8, %o0
496 EX_ST(STORE_INIT_MRU(%o4, %o0), memcpy_retl_o2_plus_o5)
497 add %o0, 8, %o0
498 EX_LD(LOAD(ldx, %o1-8, %o4), memcpy_retl_o2_plus_o5)
499 sub %o5, 64, %o5
500 bgu %xcc,.Lalign_loop_rest
501 ! mark cache line as LRU
502 EX_ST(STORE_INIT(%o4, %o0), memcpy_retl_o2_plus_o5_plus_64)
503
504 cmp %o5, ST_CHUNK*64
505 bgu,pt %xcc, .Lalign_loop_start
506 mov ST_CHUNK,%o3
507
508 cmp %o5, 0
509 beq .Lalign_done
510 nop
511 .Lalign_loop_fin:
512 EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2_plus_o5)
513 EX_ST(STORE(stx, %o4, %o0+8), memcpy_retl_o2_plus_o5)
514 EX_LD(LOAD(ldx, %o1+8, %o4), memcpy_retl_o2_plus_o5)
515 EX_ST(STORE(stx, %o4, %o0+8+8), memcpy_retl_o2_plus_o5)
516 EX_LD(LOAD(ldx, %o1+16, %o4), memcpy_retl_o2_plus_o5)
517 EX_ST(STORE(stx, %o4, %o0+8+16), memcpy_retl_o2_plus_o5)
518 subcc %o5, 64, %o5
519 EX_LD(LOAD(ldx, %o1+24, %o4), memcpy_retl_o2_plus_o5_64)
520 EX_ST(STORE(stx, %o4, %o0+8+24), memcpy_retl_o2_plus_o5_64)
521 EX_LD(LOAD(ldx, %o1+32, %o4), memcpy_retl_o2_plus_o5_64)
522 EX_ST(STORE(stx, %o4, %o0+8+32), memcpy_retl_o2_plus_o5_64)
523 EX_LD(LOAD(ldx, %o1+40, %o4), memcpy_retl_o2_plus_o5_64)
524 EX_ST(STORE(stx, %o4, %o0+8+40), memcpy_retl_o2_plus_o5_64)
525 EX_LD(LOAD(ldx, %o1+48, %o4), memcpy_retl_o2_plus_o5_64)
526 add %o1, 64, %o1
527 EX_ST(STORE(stx, %o4, %o0+8+48), memcpy_retl_o2_plus_o5_64)
528 add %o0, 64, %o0
529 EX_LD(LOAD(ldx, %o1-8, %o4), memcpy_retl_o2_plus_o5_64)
530 bgu %xcc,.Lalign_loop_fin
531 EX_ST(STORE(stx, %o4, %o0), memcpy_retl_o2_plus_o5_64)
532
533 .Lalign_done:
534 add %o0, 8, %o0 ! restore %o0 from ASI alignment
535 membar #StoreStore
536 sub %o2, 63, %o2 ! adjust length to allow cc test
537 ba .Lmedl63 ! in .Lmedl63
538 nop
539
540 .align 16
541 ! Dst is on 8 byte boundary; src is not; remaining count > SMALL_MAX
542 .Lunalignsetup:
543 .Lunalignrejoin:
544 mov %g1, %o3 ! save %g1 as VISEntryHalf clobbers it
545 #ifdef NON_USER_COPY
546 VISEntryHalfFast(.Lmedium_vis_entry_fail_cp)
547 #else
548 VISEntryHalf
549 #endif
550 mov %o3, %g1 ! restore %g1
551
552 set MED_UMAX, %o3
553 cmp %o2, %o3 ! check for.Lmedium unaligned limit
554 bge,pt %xcc,.Lunalign_large
555 prefetch [%o1 + (4 * BLOCK_SIZE)], 20
556 andn %o2, 0x3f, %o5 ! %o5 is multiple of block size
557 and %o2, 0x3f, %o2 ! residue bytes in %o2
558 cmp %o2, 8 ! Insure we do not load beyond
559 bgt .Lunalign_adjust ! end of source buffer
560 andn %o1, 0x7, %o4 ! %o4 has long word aligned src address
561 add %o2, 64, %o2 ! adjust to leave loop
562 sub %o5, 64, %o5 ! early if necessary
563 .Lunalign_adjust:
564 alignaddr %o1, %g0, %g0 ! generate %gsr
565 add %o1, %o5, %o1 ! advance %o1 to after blocks
566 EX_LD_FP(LOAD(ldd, %o4, %f0), memcpy_retl_o2_plus_o5)
567 .Lunalign_loop:
568 EX_LD_FP(LOAD(ldd, %o4+8, %f2), memcpy_retl_o2_plus_o5)
569 faligndata %f0, %f2, %f16
570 EX_LD_FP(LOAD(ldd, %o4+16, %f4), memcpy_retl_o2_plus_o5)
571 subcc %o5, BLOCK_SIZE, %o5
572 EX_ST_FP(STORE(std, %f16, %o0), memcpy_retl_o2_plus_o5_plus_64)
573 faligndata %f2, %f4, %f18
574 EX_LD_FP(LOAD(ldd, %o4+24, %f6), memcpy_retl_o2_plus_o5_plus_56)
575 EX_ST_FP(STORE(std, %f18, %o0+8), memcpy_retl_o2_plus_o5_plus_56)
576 faligndata %f4, %f6, %f20
577 EX_LD_FP(LOAD(ldd, %o4+32, %f8), memcpy_retl_o2_plus_o5_plus_48)
578 EX_ST_FP(STORE(std, %f20, %o0+16), memcpy_retl_o2_plus_o5_plus_48)
579 faligndata %f6, %f8, %f22
580 EX_LD_FP(LOAD(ldd, %o4+40, %f10), memcpy_retl_o2_plus_o5_plus_40)
581 EX_ST_FP(STORE(std, %f22, %o0+24), memcpy_retl_o2_plus_o5_plus_40)
582 faligndata %f8, %f10, %f24
583 EX_LD_FP(LOAD(ldd, %o4+48, %f12), memcpy_retl_o2_plus_o5_plus_32)
584 EX_ST_FP(STORE(std, %f24, %o0+32), memcpy_retl_o2_plus_o5_plus_32)
585 faligndata %f10, %f12, %f26
586 EX_LD_FP(LOAD(ldd, %o4+56, %f14), memcpy_retl_o2_plus_o5_plus_24)
587 add %o4, BLOCK_SIZE, %o4
588 EX_ST_FP(STORE(std, %f26, %o0+40), memcpy_retl_o2_plus_o5_plus_24)
589 faligndata %f12, %f14, %f28
590 EX_LD_FP(LOAD(ldd, %o4, %f0), memcpy_retl_o2_plus_o5_plus_16)
591 EX_ST_FP(STORE(std, %f28, %o0+48), memcpy_retl_o2_plus_o5_plus_16)
592 faligndata %f14, %f0, %f30
593 EX_ST_FP(STORE(std, %f30, %o0+56), memcpy_retl_o2_plus_o5_plus_8)
594 add %o0, BLOCK_SIZE, %o0
595 bgu,pt %xcc, .Lunalign_loop
596 prefetch [%o4 + (5 * BLOCK_SIZE)], 20
597 ba .Lunalign_done
598 nop
599
600 .Lunalign_large:
601 andcc %o0, 0x3f, %o3 ! is dst 64-byte block aligned?
602 bz %xcc, .Lunalignsrc
603 sub %o3, 64, %o3 ! %o3 will be multiple of 8
604 neg %o3 ! bytes until dest is 64 byte aligned
605 sub %o2, %o3, %o2 ! update cnt with bytes to be moved
606 ! Move bytes according to source alignment
607 andcc %o1, 0x1, %o5
608 bnz %xcc, .Lunalignbyte ! check for byte alignment
609 nop
610 andcc %o1, 2, %o5 ! check for half word alignment
611 bnz %xcc, .Lunalignhalf
612 nop
613 ! Src is word aligned
614 .Lunalignword:
615 EX_LD_FP(LOAD(ld, %o1, %o4), memcpy_retl_o2_plus_o3) ! load 4 bytes
616 add %o1, 8, %o1 ! increase src ptr by 8
617 EX_ST_FP(STORE(stw, %o4, %o0), memcpy_retl_o2_plus_o3) ! and store 4
618 subcc %o3, 8, %o3 ! decrease count by 8
619 EX_LD_FP(LOAD(ld, %o1-4, %o4), memcpy_retl_o2_plus_o3_plus_4)! load 4
620 add %o0, 8, %o0 ! increase dst ptr by 8
621 bnz %xcc, .Lunalignword
622 EX_ST_FP(STORE(stw, %o4, %o0-4), memcpy_retl_o2_plus_o3_plus_4)
623 ba .Lunalignsrc
624 nop
625
626 ! Src is half-word aligned
627 .Lunalignhalf:
628 EX_LD_FP(LOAD(lduh, %o1, %o4), memcpy_retl_o2_plus_o3) ! load 2 bytes
629 sllx %o4, 32, %o5 ! shift left
630 EX_LD_FP(LOAD(lduw, %o1+2, %o4), memcpy_retl_o2_plus_o3)
631 or %o4, %o5, %o5
632 sllx %o5, 16, %o5
633 EX_LD_FP(LOAD(lduh, %o1+6, %o4), memcpy_retl_o2_plus_o3)
634 or %o4, %o5, %o5
635 EX_ST_FP(STORE(stx, %o5, %o0), memcpy_retl_o2_plus_o3)
636 add %o1, 8, %o1
637 subcc %o3, 8, %o3
638 bnz %xcc, .Lunalignhalf
639 add %o0, 8, %o0
640 ba .Lunalignsrc
641 nop
642
643 ! Src is Byte aligned
644 .Lunalignbyte:
645 sub %o0, %o1, %o0 ! share pointer advance
646 .Lunalignbyte_loop:
647 EX_LD_FP(LOAD(ldub, %o1, %o4), memcpy_retl_o2_plus_o3)
648 sllx %o4, 56, %o5
649 EX_LD_FP(LOAD(lduh, %o1+1, %o4), memcpy_retl_o2_plus_o3)
650 sllx %o4, 40, %o4
651 or %o4, %o5, %o5
652 EX_LD_FP(LOAD(lduh, %o1+3, %o4), memcpy_retl_o2_plus_o3)
653 sllx %o4, 24, %o4
654 or %o4, %o5, %o5
655 EX_LD_FP(LOAD(lduh, %o1+5, %o4), memcpy_retl_o2_plus_o3)
656 sllx %o4, 8, %o4
657 or %o4, %o5, %o5
658 EX_LD_FP(LOAD(ldub, %o1+7, %o4), memcpy_retl_o2_plus_o3)
659 or %o4, %o5, %o5
660 add %o0, %o1, %o0
661 EX_ST_FP(STORE(stx, %o5, %o0), memcpy_retl_o2_plus_o3)
662 sub %o0, %o1, %o0
663 subcc %o3, 8, %o3
664 bnz %xcc, .Lunalignbyte_loop
665 add %o1, 8, %o1
666 add %o0,%o1, %o0 ! restore pointer
667
668 ! Destination is now block (64 byte aligned)
669 .Lunalignsrc:
670 andn %o2, 0x3f, %o5 ! %o5 is multiple of block size
671 and %o2, 0x3f, %o2 ! residue bytes in %o2
672 add %o2, 64, %o2 ! Insure we do not load beyond
673 sub %o5, 64, %o5 ! end of source buffer
674
675 andn %o1, 0x7, %o4 ! %o4 has long word aligned src address
676 alignaddr %o1, %g0, %g0 ! generate %gsr
677 add %o1, %o5, %o1 ! advance %o1 to after blocks
678
679 EX_LD_FP(LOAD(ldd, %o4, %f14), memcpy_retl_o2_plus_o5)
680 add %o4, 8, %o4
681 .Lunalign_sloop:
682 EX_LD_FP(LOAD(ldd, %o4, %f16), memcpy_retl_o2_plus_o5)
683 faligndata %f14, %f16, %f0
684 EX_LD_FP(LOAD(ldd, %o4+8, %f18), memcpy_retl_o2_plus_o5)
685 faligndata %f16, %f18, %f2
686 EX_LD_FP(LOAD(ldd, %o4+16, %f20), memcpy_retl_o2_plus_o5)
687 faligndata %f18, %f20, %f4
688 EX_ST_FP(STORE(std, %f0, %o0), memcpy_retl_o2_plus_o5)
689 subcc %o5, 64, %o5
690 EX_LD_FP(LOAD(ldd, %o4+24, %f22), memcpy_retl_o2_plus_o5_plus_56)
691 faligndata %f20, %f22, %f6
692 EX_ST_FP(STORE(std, %f2, %o0+8), memcpy_retl_o2_plus_o5_plus_56)
693 EX_LD_FP(LOAD(ldd, %o4+32, %f24), memcpy_retl_o2_plus_o5_plus_48)
694 faligndata %f22, %f24, %f8
695 EX_ST_FP(STORE(std, %f4, %o0+16), memcpy_retl_o2_plus_o5_plus_48)
696 EX_LD_FP(LOAD(ldd, %o4+40, %f26), memcpy_retl_o2_plus_o5_plus_40)
697 faligndata %f24, %f26, %f10
698 EX_ST_FP(STORE(std, %f6, %o0+24), memcpy_retl_o2_plus_o5_plus_40)
699 EX_LD_FP(LOAD(ldd, %o4+48, %f28), memcpy_retl_o2_plus_o5_plus_40)
700 faligndata %f26, %f28, %f12
701 EX_ST_FP(STORE(std, %f8, %o0+32), memcpy_retl_o2_plus_o5_plus_40)
702 add %o4, 64, %o4
703 EX_LD_FP(LOAD(ldd, %o4-8, %f30), memcpy_retl_o2_plus_o5_plus_40)
704 faligndata %f28, %f30, %f14
705 EX_ST_FP(STORE(std, %f10, %o0+40), memcpy_retl_o2_plus_o5_plus_40)
706 EX_ST_FP(STORE(std, %f12, %o0+48), memcpy_retl_o2_plus_o5_plus_40)
707 add %o0, 64, %o0
708 EX_ST_FP(STORE(std, %f14, %o0-8), memcpy_retl_o2_plus_o5_plus_40)
709 fsrc2 %f30, %f14
710 bgu,pt %xcc, .Lunalign_sloop
711 prefetch [%o4 + (8 * BLOCK_SIZE)], 20
712
713 .Lunalign_done:
714 ! Handle trailing bytes, 64 to 127
715 ! Dest long word aligned, Src not long word aligned
716 cmp %o2, 15
717 bleu %xcc, .Lunalign_short
718
719 andn %o2, 0x7, %o5 ! %o5 is multiple of 8
720 and %o2, 0x7, %o2 ! residue bytes in %o2
721 add %o2, 8, %o2
722 sub %o5, 8, %o5 ! insure we do not load past end of src
723 andn %o1, 0x7, %o4 ! %o4 has long word aligned src address
724 add %o1, %o5, %o1 ! advance %o1 to after multiple of 8
725 EX_LD_FP(LOAD(ldd, %o4, %f0), memcpy_retl_o2_plus_o5)! fetch partialword
726 .Lunalign_by8:
727 EX_LD_FP(LOAD(ldd, %o4+8, %f2), memcpy_retl_o2_plus_o5)
728 add %o4, 8, %o4
729 faligndata %f0, %f2, %f16
730 subcc %o5, 8, %o5
731 EX_ST_FP(STORE(std, %f16, %o0), memcpy_retl_o2_plus_o5)
732 fsrc2 %f2, %f0
733 bgu,pt %xcc, .Lunalign_by8
734 add %o0, 8, %o0
735
736 .Lunalign_short:
737 #ifdef NON_USER_COPY
738 VISExitHalfFast
739 #else
740 VISExitHalf
741 #endif
742 ba .Lsmallrest
743 nop
744
745 /*
746 * This is a special case of nested memcpy. This can happen when kernel
747 * calls unaligned memcpy back to back without saving FP registers. We need
748 * traps(context switch) to save/restore FP registers. If the kernel calls
749 * memcpy without this trap sequence we will hit FP corruption. Let's use
750 * the normal integer load/store method in this case.
751 */
752
753 #ifdef NON_USER_COPY
754 .Lmedium_vis_entry_fail_cp:
755 or %o0, %o1, %g2
756 #endif
757 .Lmedium_cp:
758 LOAD(prefetch, %o1 + 0x40, #n_reads_strong)
759 andcc %g2, 0x7, %g0
760 bne,pn %xcc, .Lmedium_unaligned_cp
761 nop
762
763 .Lmedium_noprefetch_cp:
764 andncc %o2, 0x20 - 1, %o5
765 be,pn %xcc, 2f
766 sub %o2, %o5, %o2
767 1: EX_LD(LOAD(ldx, %o1 + 0x00, %o3), memcpy_retl_o2_plus_o5)
768 EX_LD(LOAD(ldx, %o1 + 0x08, %g2), memcpy_retl_o2_plus_o5)
769 EX_LD(LOAD(ldx, %o1 + 0x10, %g7), memcpy_retl_o2_plus_o5)
770 EX_LD(LOAD(ldx, %o1 + 0x18, %o4), memcpy_retl_o2_plus_o5)
771 add %o1, 0x20, %o1
772 subcc %o5, 0x20, %o5
773 EX_ST(STORE(stx, %o3, %o0 + 0x00), memcpy_retl_o2_plus_o5_plus_32)
774 EX_ST(STORE(stx, %g2, %o0 + 0x08), memcpy_retl_o2_plus_o5_plus_24)
775 EX_ST(STORE(stx, %g7, %o0 + 0x10), memcpy_retl_o2_plus_o5_plus_24)
776 EX_ST(STORE(stx, %o4, %o0 + 0x18), memcpy_retl_o2_plus_o5_plus_8)
777 bne,pt %xcc, 1b
778 add %o0, 0x20, %o0
779 2: andcc %o2, 0x18, %o5
780 be,pt %xcc, 3f
781 sub %o2, %o5, %o2
782 1: EX_LD(LOAD(ldx, %o1 + 0x00, %o3), memcpy_retl_o2_plus_o5)
783 add %o1, 0x08, %o1
784 add %o0, 0x08, %o0
785 subcc %o5, 0x08, %o5
786 bne,pt %xcc, 1b
787 EX_ST(STORE(stx, %o3, %o0 - 0x08), memcpy_retl_o2_plus_o5_plus_8)
788 3: brz,pt %o2, .Lexit_cp
789 cmp %o2, 0x04
790 bl,pn %xcc, .Ltiny_cp
791 nop
792 EX_LD(LOAD(lduw, %o1 + 0x00, %o3), memcpy_retl_o2)
793 add %o1, 0x04, %o1
794 add %o0, 0x04, %o0
795 subcc %o2, 0x04, %o2
796 bne,pn %xcc, .Ltiny_cp
797 EX_ST(STORE(stw, %o3, %o0 - 0x04), memcpy_retl_o2_plus_4)
798 ba,a,pt %xcc, .Lexit_cp
799
800 .Lmedium_unaligned_cp:
801 /* First get dest 8 byte aligned. */
802 sub %g0, %o0, %o3
803 and %o3, 0x7, %o3
804 brz,pt %o3, 2f
805 sub %o2, %o3, %o2
806
807 1: EX_LD(LOAD(ldub, %o1 + 0x00, %g2), memcpy_retl_o2_plus_g1)
808 add %o1, 1, %o1
809 subcc %o3, 1, %o3
810 add %o0, 1, %o0
811 bne,pt %xcc, 1b
812 EX_ST(STORE(stb, %g2, %o0 - 0x01), memcpy_retl_o2_plus_g1_plus_1)
813 2:
814 and %o1, 0x7, %o3
815 brz,pn %o3, .Lmedium_noprefetch_cp
816 sll %o3, 3, %o3
817 mov 64, %g2
818 sub %g2, %o3, %g2
819 andn %o1, 0x7, %o1
820 EX_LD(LOAD(ldx, %o1 + 0x00, %o4), memcpy_retl_o2)
821 sllx %o4, %o3, %o4
822 andn %o2, 0x08 - 1, %o5
823 sub %o2, %o5, %o2
824
825 1: EX_LD(LOAD(ldx, %o1 + 0x08, %g3), memcpy_retl_o2_plus_o5)
826 add %o1, 0x08, %o1
827 subcc %o5, 0x08, %o5
828 srlx %g3, %g2, %g7
829 or %g7, %o4, %g7
830 EX_ST(STORE(stx, %g7, %o0 + 0x00), memcpy_retl_o2_plus_o5_plus_8)
831 add %o0, 0x08, %o0
832 bne,pt %xcc, 1b
833 sllx %g3, %o3, %o4
834 srl %o3, 3, %o3
835 add %o1, %o3, %o1
836 brz,pn %o2, .Lexit_cp
837 nop
838 ba,pt %xcc, .Lsmall_unaligned_cp
839
840 .Ltiny_cp:
841 EX_LD(LOAD(ldub, %o1 + 0x00, %o3), memcpy_retl_o2)
842 subcc %o2, 1, %o2
843 be,pn %xcc, .Lexit_cp
844 EX_ST(STORE(stb, %o3, %o0 + 0x00), memcpy_retl_o2_plus_1)
845 EX_LD(LOAD(ldub, %o1 + 0x01, %o3), memcpy_retl_o2)
846 subcc %o2, 1, %o2
847 be,pn %xcc, .Lexit_cp
848 EX_ST(STORE(stb, %o3, %o0 + 0x01), memcpy_retl_o2_plus_1)
849 EX_LD(LOAD(ldub, %o1 + 0x02, %o3), memcpy_retl_o2)
850 ba,pt %xcc, .Lexit_cp
851 EX_ST(STORE(stb, %o3, %o0 + 0x02), memcpy_retl_o2)
852
853 .Lsmall_cp:
854 andcc %g2, 0x3, %g0
855 bne,pn %xcc, .Lsmall_unaligned_cp
856 andn %o2, 0x4 - 1, %o5
857 sub %o2, %o5, %o2
858 1:
859 EX_LD(LOAD(lduw, %o1 + 0x00, %o3), memcpy_retl_o2_plus_o5)
860 add %o1, 0x04, %o1
861 subcc %o5, 0x04, %o5
862 add %o0, 0x04, %o0
863 bne,pt %xcc, 1b
864 EX_ST(STORE(stw, %o3, %o0 - 0x04), memcpy_retl_o2_plus_o5_plus_4)
865 brz,pt %o2, .Lexit_cp
866 nop
867 ba,a,pt %xcc, .Ltiny_cp
868
869 .Lsmall_unaligned_cp:
870 1: EX_LD(LOAD(ldub, %o1 + 0x00, %o3), memcpy_retl_o2)
871 add %o1, 1, %o1
872 add %o0, 1, %o0
873 subcc %o2, 1, %o2
874 bne,pt %xcc, 1b
875 EX_ST(STORE(stb, %o3, %o0 - 0x01), memcpy_retl_o2_plus_1)
876 ba,a,pt %xcc, .Lexit_cp
877
878 .Lsmallrest:
879 tst %o2
880 bz,pt %xcc, .Lsmallx
881 cmp %o2, 4
882 blt,pn %xcc, .Lsmallleft3
883 nop
884 sub %o2, 3, %o2
885 .Lsmallnotalign4:
886 EX_LD(LOAD(ldub, %o1, %o3), memcpy_retl_o2_plus_3)! read byte
887 subcc %o2, 4, %o2 ! reduce count by 4
888 EX_ST(STORE(stb, %o3, %o0), memcpy_retl_o2_plus_7)! write byte & repeat
889 EX_LD(LOAD(ldub, %o1+1, %o3), memcpy_retl_o2_plus_6)! for total of 4
890 add %o1, 4, %o1 ! advance SRC by 4
891 EX_ST(STORE(stb, %o3, %o0+1), memcpy_retl_o2_plus_6)
892 EX_LD(LOAD(ldub, %o1-2, %o3), memcpy_retl_o2_plus_5)
893 add %o0, 4, %o0 ! advance DST by 4
894 EX_ST(STORE(stb, %o3, %o0-2), memcpy_retl_o2_plus_5)
895 EX_LD(LOAD(ldub, %o1-1, %o3), memcpy_retl_o2_plus_4)
896 bgu,pt %xcc, .Lsmallnotalign4 ! loop til 3 or fewer bytes remain
897 EX_ST(STORE(stb, %o3, %o0-1), memcpy_retl_o2_plus_4)
898 addcc %o2, 3, %o2 ! restore count
899 bz,pt %xcc, .Lsmallx
900 .Lsmallleft3: ! 1, 2, or 3 bytes remain
901 subcc %o2, 1, %o2
902 EX_LD(LOAD(ldub, %o1, %o3), memcpy_retl_o2_plus_1) ! load one byte
903 bz,pt %xcc, .Lsmallx
904 EX_ST(STORE(stb, %o3, %o0), memcpy_retl_o2_plus_1) ! store one byte
905 EX_LD(LOAD(ldub, %o1+1, %o3), memcpy_retl_o2) ! load second byte
906 subcc %o2, 1, %o2
907 bz,pt %xcc, .Lsmallx
908 EX_ST(STORE(stb, %o3, %o0+1), memcpy_retl_o2_plus_1)! store second byte
909 EX_LD(LOAD(ldub, %o1+2, %o3), memcpy_retl_o2) ! load third byte
910 EX_ST(STORE(stb, %o3, %o0+2), memcpy_retl_o2) ! store third byte
911 .Lsmallx:
912 retl
913 mov EX_RETVAL(%g1), %o0
914 .Lsmallfin:
915 tst %o2
916 bnz,pn %xcc, .Lsmallleft3
917 nop
918 retl
919 mov EX_RETVAL(%g1), %o0 ! restore %o0
920 .Lexit_cp:
921 retl
922 mov EX_RETVAL(%g1), %o0
923 .size FUNC_NAME, .-FUNC_NAME
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