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249ac17e CZ |
1 | /* |
2 | * arch/xtensa/lib/hal/memcopy.S -- Core HAL library functions | |
3 | * xthal_memcpy and xthal_bcopy | |
4 | * | |
5 | * This file is subject to the terms and conditions of the GNU General Public | |
6 | * License. See the file "COPYING" in the main directory of this archive | |
7 | * for more details. | |
8 | * | |
eae8a416 | 9 | * Copyright (C) 2002 - 2012 Tensilica Inc. |
249ac17e CZ |
10 | */ |
11 | ||
5cf97ebd | 12 | #include <linux/linkage.h> |
367b8112 | 13 | #include <variant/core.h> |
fbb871e2 | 14 | #include <asm/asmmacro.h> |
249ac17e | 15 | |
249ac17e CZ |
16 | /* |
17 | * void *memcpy(void *dst, const void *src, size_t len); | |
249ac17e CZ |
18 | * |
19 | * This function is intended to do the same thing as the standard | |
eae8a416 | 20 | * library function memcpy() for most cases. |
249ac17e CZ |
21 | * However, where the source and/or destination references |
22 | * an instruction RAM or ROM or a data RAM or ROM, that | |
23 | * source and/or destination will always be accessed with | |
24 | * 32-bit load and store instructions (as required for these | |
25 | * types of devices). | |
26 | * | |
27 | * !!!!!!! XTFIXME: | |
28 | * !!!!!!! Handling of IRAM/IROM has not yet | |
29 | * !!!!!!! been implemented. | |
30 | * | |
249ac17e CZ |
31 | * The (general case) algorithm is as follows: |
32 | * If destination is unaligned, align it by conditionally | |
33 | * copying 1 and 2 bytes. | |
34 | * If source is aligned, | |
35 | * do 16 bytes with a loop, and then finish up with | |
36 | * 8, 4, 2, and 1 byte copies conditional on the length; | |
37 | * else (if source is unaligned), | |
38 | * do the same, but use SRC to align the source data. | |
39 | * This code tries to use fall-through branches for the common | |
40 | * case of aligned source and destination and multiple | |
41 | * of 4 (or 8) length. | |
42 | * | |
43 | * Register use: | |
44 | * a0/ return address | |
45 | * a1/ stack pointer | |
46 | * a2/ return value | |
47 | * a3/ src | |
48 | * a4/ length | |
49 | * a5/ dst | |
50 | * a6/ tmp | |
51 | * a7/ tmp | |
52 | * a8/ tmp | |
53 | * a9/ tmp | |
54 | * a10/ tmp | |
55 | * a11/ tmp | |
56 | */ | |
57 | ||
58 | .text | |
249ac17e CZ |
59 | |
60 | /* | |
61 | * Byte by byte copy | |
62 | */ | |
63 | .align 4 | |
64 | .byte 0 # 1 mod 4 alignment for LOOPNEZ | |
65 | # (0 mod 4 alignment for LBEG) | |
66 | .Lbytecopy: | |
67 | #if XCHAL_HAVE_LOOPS | |
68 | loopnez a4, .Lbytecopydone | |
69 | #else /* !XCHAL_HAVE_LOOPS */ | |
70 | beqz a4, .Lbytecopydone | |
71 | add a7, a3, a4 # a7 = end address for source | |
72 | #endif /* !XCHAL_HAVE_LOOPS */ | |
73 | .Lnextbyte: | |
74 | l8ui a6, a3, 0 | |
75 | addi a3, a3, 1 | |
76 | s8i a6, a5, 0 | |
77 | addi a5, a5, 1 | |
78 | #if !XCHAL_HAVE_LOOPS | |
eae8a416 | 79 | bne a3, a7, .Lnextbyte # continue loop if $a3:src != $a7:src_end |
249ac17e CZ |
80 | #endif /* !XCHAL_HAVE_LOOPS */ |
81 | .Lbytecopydone: | |
82 | retw | |
83 | ||
84 | /* | |
85 | * Destination is unaligned | |
86 | */ | |
87 | ||
88 | .align 4 | |
89 | .Ldst1mod2: # dst is only byte aligned | |
90 | _bltui a4, 7, .Lbytecopy # do short copies byte by byte | |
91 | ||
92 | # copy 1 byte | |
93 | l8ui a6, a3, 0 | |
94 | addi a3, a3, 1 | |
95 | addi a4, a4, -1 | |
96 | s8i a6, a5, 0 | |
97 | addi a5, a5, 1 | |
98 | _bbci.l a5, 1, .Ldstaligned # if dst is now aligned, then | |
99 | # return to main algorithm | |
100 | .Ldst2mod4: # dst 16-bit aligned | |
101 | # copy 2 bytes | |
102 | _bltui a4, 6, .Lbytecopy # do short copies byte by byte | |
103 | l8ui a6, a3, 0 | |
104 | l8ui a7, a3, 1 | |
105 | addi a3, a3, 2 | |
106 | addi a4, a4, -2 | |
107 | s8i a6, a5, 0 | |
108 | s8i a7, a5, 1 | |
109 | addi a5, a5, 2 | |
110 | j .Ldstaligned # dst is now aligned, return to main algorithm | |
111 | ||
c633544a MF |
112 | ENTRY(__memcpy) |
113 | WEAK(memcpy) | |
249ac17e CZ |
114 | |
115 | entry sp, 16 # minimal stack frame | |
116 | # a2/ dst, a3/ src, a4/ len | |
117 | mov a5, a2 # copy dst so that a2 is return value | |
118 | .Lcommon: | |
119 | _bbsi.l a2, 0, .Ldst1mod2 # if dst is 1 mod 2 | |
120 | _bbsi.l a2, 1, .Ldst2mod4 # if dst is 2 mod 4 | |
121 | .Ldstaligned: # return here from .Ldst?mod? once dst is aligned | |
122 | srli a7, a4, 4 # number of loop iterations with 16B | |
123 | # per iteration | |
124 | movi a8, 3 # if source is not aligned, | |
125 | _bany a3, a8, .Lsrcunaligned # then use shifting copy | |
126 | /* | |
127 | * Destination and source are word-aligned, use word copy. | |
128 | */ | |
129 | # copy 16 bytes per iteration for word-aligned dst and word-aligned src | |
130 | #if XCHAL_HAVE_LOOPS | |
131 | loopnez a7, .Loop1done | |
132 | #else /* !XCHAL_HAVE_LOOPS */ | |
133 | beqz a7, .Loop1done | |
134 | slli a8, a7, 4 | |
135 | add a8, a8, a3 # a8 = end of last 16B source chunk | |
136 | #endif /* !XCHAL_HAVE_LOOPS */ | |
137 | .Loop1: | |
138 | l32i a6, a3, 0 | |
139 | l32i a7, a3, 4 | |
140 | s32i a6, a5, 0 | |
141 | l32i a6, a3, 8 | |
142 | s32i a7, a5, 4 | |
143 | l32i a7, a3, 12 | |
144 | s32i a6, a5, 8 | |
145 | addi a3, a3, 16 | |
146 | s32i a7, a5, 12 | |
147 | addi a5, a5, 16 | |
148 | #if !XCHAL_HAVE_LOOPS | |
eae8a416 | 149 | bne a3, a8, .Loop1 # continue loop if a3:src != a8:src_end |
249ac17e CZ |
150 | #endif /* !XCHAL_HAVE_LOOPS */ |
151 | .Loop1done: | |
152 | bbci.l a4, 3, .L2 | |
153 | # copy 8 bytes | |
154 | l32i a6, a3, 0 | |
155 | l32i a7, a3, 4 | |
156 | addi a3, a3, 8 | |
157 | s32i a6, a5, 0 | |
158 | s32i a7, a5, 4 | |
159 | addi a5, a5, 8 | |
160 | .L2: | |
161 | bbsi.l a4, 2, .L3 | |
162 | bbsi.l a4, 1, .L4 | |
163 | bbsi.l a4, 0, .L5 | |
164 | retw | |
165 | .L3: | |
166 | # copy 4 bytes | |
167 | l32i a6, a3, 0 | |
168 | addi a3, a3, 4 | |
169 | s32i a6, a5, 0 | |
170 | addi a5, a5, 4 | |
171 | bbsi.l a4, 1, .L4 | |
172 | bbsi.l a4, 0, .L5 | |
173 | retw | |
174 | .L4: | |
175 | # copy 2 bytes | |
176 | l16ui a6, a3, 0 | |
177 | addi a3, a3, 2 | |
178 | s16i a6, a5, 0 | |
179 | addi a5, a5, 2 | |
180 | bbsi.l a4, 0, .L5 | |
181 | retw | |
182 | .L5: | |
183 | # copy 1 byte | |
184 | l8ui a6, a3, 0 | |
185 | s8i a6, a5, 0 | |
186 | retw | |
187 | ||
188 | /* | |
189 | * Destination is aligned, Source is unaligned | |
190 | */ | |
191 | ||
192 | .align 4 | |
193 | .Lsrcunaligned: | |
194 | _beqz a4, .Ldone # avoid loading anything for zero-length copies | |
195 | # copy 16 bytes per iteration for word-aligned dst and unaligned src | |
fbb871e2 | 196 | __ssa8 a3 # set shift amount from byte offset |
c4c4594b CZ |
197 | |
198 | /* set to 1 when running on ISS (simulator) with the | |
199 | lint or ferret client, or 0 to save a few cycles */ | |
200 | #define SIM_CHECKS_ALIGNMENT 1 | |
249ac17e CZ |
201 | #if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT |
202 | and a11, a3, a8 # save unalignment offset for below | |
203 | sub a3, a3, a11 # align a3 | |
204 | #endif | |
205 | l32i a6, a3, 0 # load first word | |
206 | #if XCHAL_HAVE_LOOPS | |
207 | loopnez a7, .Loop2done | |
208 | #else /* !XCHAL_HAVE_LOOPS */ | |
209 | beqz a7, .Loop2done | |
210 | slli a10, a7, 4 | |
211 | add a10, a10, a3 # a10 = end of last 16B source chunk | |
212 | #endif /* !XCHAL_HAVE_LOOPS */ | |
213 | .Loop2: | |
214 | l32i a7, a3, 4 | |
215 | l32i a8, a3, 8 | |
fbb871e2 | 216 | __src_b a6, a6, a7 |
249ac17e CZ |
217 | s32i a6, a5, 0 |
218 | l32i a9, a3, 12 | |
fbb871e2 | 219 | __src_b a7, a7, a8 |
249ac17e CZ |
220 | s32i a7, a5, 4 |
221 | l32i a6, a3, 16 | |
fbb871e2 | 222 | __src_b a8, a8, a9 |
249ac17e CZ |
223 | s32i a8, a5, 8 |
224 | addi a3, a3, 16 | |
fbb871e2 | 225 | __src_b a9, a9, a6 |
249ac17e CZ |
226 | s32i a9, a5, 12 |
227 | addi a5, a5, 16 | |
228 | #if !XCHAL_HAVE_LOOPS | |
eae8a416 | 229 | bne a3, a10, .Loop2 # continue loop if a3:src != a10:src_end |
249ac17e CZ |
230 | #endif /* !XCHAL_HAVE_LOOPS */ |
231 | .Loop2done: | |
232 | bbci.l a4, 3, .L12 | |
233 | # copy 8 bytes | |
234 | l32i a7, a3, 4 | |
235 | l32i a8, a3, 8 | |
fbb871e2 | 236 | __src_b a6, a6, a7 |
249ac17e CZ |
237 | s32i a6, a5, 0 |
238 | addi a3, a3, 8 | |
fbb871e2 | 239 | __src_b a7, a7, a8 |
249ac17e CZ |
240 | s32i a7, a5, 4 |
241 | addi a5, a5, 8 | |
242 | mov a6, a8 | |
243 | .L12: | |
244 | bbci.l a4, 2, .L13 | |
245 | # copy 4 bytes | |
246 | l32i a7, a3, 4 | |
247 | addi a3, a3, 4 | |
fbb871e2 | 248 | __src_b a6, a6, a7 |
249ac17e CZ |
249 | s32i a6, a5, 0 |
250 | addi a5, a5, 4 | |
251 | mov a6, a7 | |
252 | .L13: | |
253 | #if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT | |
254 | add a3, a3, a11 # readjust a3 with correct misalignment | |
255 | #endif | |
256 | bbsi.l a4, 1, .L14 | |
257 | bbsi.l a4, 0, .L15 | |
258 | .Ldone: retw | |
259 | .L14: | |
260 | # copy 2 bytes | |
261 | l8ui a6, a3, 0 | |
262 | l8ui a7, a3, 1 | |
263 | addi a3, a3, 2 | |
264 | s8i a6, a5, 0 | |
265 | s8i a7, a5, 1 | |
266 | addi a5, a5, 2 | |
267 | bbsi.l a4, 0, .L15 | |
268 | retw | |
269 | .L15: | |
270 | # copy 1 byte | |
271 | l8ui a6, a3, 0 | |
272 | s8i a6, a5, 0 | |
273 | retw | |
eae8a416 | 274 | |
c633544a | 275 | ENDPROC(__memcpy) |
eae8a416 CZ |
276 | |
277 | /* | |
278 | * void bcopy(const void *src, void *dest, size_t n); | |
279 | */ | |
5cf97ebd MF |
280 | |
281 | ENTRY(bcopy) | |
282 | ||
eae8a416 CZ |
283 | entry sp, 16 # minimal stack frame |
284 | # a2=src, a3=dst, a4=len | |
285 | mov a5, a3 | |
286 | mov a3, a2 | |
287 | mov a2, a5 | |
288 | j .Lmovecommon # go to common code for memmove+bcopy | |
289 | ||
5cf97ebd MF |
290 | ENDPROC(bcopy) |
291 | ||
eae8a416 CZ |
292 | /* |
293 | * void *memmove(void *dst, const void *src, size_t len); | |
294 | * | |
295 | * This function is intended to do the same thing as the standard | |
296 | * library function memmove() for most cases. | |
297 | * However, where the source and/or destination references | |
298 | * an instruction RAM or ROM or a data RAM or ROM, that | |
299 | * source and/or destination will always be accessed with | |
300 | * 32-bit load and store instructions (as required for these | |
301 | * types of devices). | |
302 | * | |
303 | * !!!!!!! XTFIXME: | |
304 | * !!!!!!! Handling of IRAM/IROM has not yet | |
305 | * !!!!!!! been implemented. | |
306 | * | |
307 | * The (general case) algorithm is as follows: | |
308 | * If end of source doesn't overlap destination then use memcpy. | |
309 | * Otherwise do memcpy backwards. | |
310 | * | |
311 | * Register use: | |
312 | * a0/ return address | |
313 | * a1/ stack pointer | |
314 | * a2/ return value | |
315 | * a3/ src | |
316 | * a4/ length | |
317 | * a5/ dst | |
318 | * a6/ tmp | |
319 | * a7/ tmp | |
320 | * a8/ tmp | |
321 | * a9/ tmp | |
322 | * a10/ tmp | |
323 | * a11/ tmp | |
324 | */ | |
325 | ||
326 | /* | |
327 | * Byte by byte copy | |
328 | */ | |
329 | .align 4 | |
330 | .byte 0 # 1 mod 4 alignment for LOOPNEZ | |
331 | # (0 mod 4 alignment for LBEG) | |
332 | .Lbackbytecopy: | |
333 | #if XCHAL_HAVE_LOOPS | |
334 | loopnez a4, .Lbackbytecopydone | |
335 | #else /* !XCHAL_HAVE_LOOPS */ | |
336 | beqz a4, .Lbackbytecopydone | |
337 | sub a7, a3, a4 # a7 = start address for source | |
338 | #endif /* !XCHAL_HAVE_LOOPS */ | |
339 | .Lbacknextbyte: | |
340 | addi a3, a3, -1 | |
341 | l8ui a6, a3, 0 | |
342 | addi a5, a5, -1 | |
343 | s8i a6, a5, 0 | |
344 | #if !XCHAL_HAVE_LOOPS | |
345 | bne a3, a7, .Lbacknextbyte # continue loop if | |
346 | # $a3:src != $a7:src_start | |
347 | #endif /* !XCHAL_HAVE_LOOPS */ | |
348 | .Lbackbytecopydone: | |
349 | retw | |
350 | ||
351 | /* | |
352 | * Destination is unaligned | |
353 | */ | |
354 | ||
355 | .align 4 | |
356 | .Lbackdst1mod2: # dst is only byte aligned | |
357 | _bltui a4, 7, .Lbackbytecopy # do short copies byte by byte | |
358 | ||
359 | # copy 1 byte | |
360 | addi a3, a3, -1 | |
361 | l8ui a6, a3, 0 | |
362 | addi a5, a5, -1 | |
363 | s8i a6, a5, 0 | |
364 | addi a4, a4, -1 | |
365 | _bbci.l a5, 1, .Lbackdstaligned # if dst is now aligned, then | |
366 | # return to main algorithm | |
367 | .Lbackdst2mod4: # dst 16-bit aligned | |
368 | # copy 2 bytes | |
369 | _bltui a4, 6, .Lbackbytecopy # do short copies byte by byte | |
370 | addi a3, a3, -2 | |
371 | l8ui a6, a3, 0 | |
372 | l8ui a7, a3, 1 | |
373 | addi a5, a5, -2 | |
374 | s8i a6, a5, 0 | |
375 | s8i a7, a5, 1 | |
376 | addi a4, a4, -2 | |
377 | j .Lbackdstaligned # dst is now aligned, | |
378 | # return to main algorithm | |
379 | ||
c633544a MF |
380 | ENTRY(__memmove) |
381 | WEAK(memmove) | |
eae8a416 CZ |
382 | |
383 | entry sp, 16 # minimal stack frame | |
384 | # a2/ dst, a3/ src, a4/ len | |
385 | mov a5, a2 # copy dst so that a2 is return value | |
386 | .Lmovecommon: | |
387 | sub a6, a5, a3 | |
388 | bgeu a6, a4, .Lcommon | |
389 | ||
390 | add a5, a5, a4 | |
391 | add a3, a3, a4 | |
392 | ||
393 | _bbsi.l a5, 0, .Lbackdst1mod2 # if dst is 1 mod 2 | |
394 | _bbsi.l a5, 1, .Lbackdst2mod4 # if dst is 2 mod 4 | |
395 | .Lbackdstaligned: # return here from .Lbackdst?mod? once dst is aligned | |
396 | srli a7, a4, 4 # number of loop iterations with 16B | |
397 | # per iteration | |
398 | movi a8, 3 # if source is not aligned, | |
399 | _bany a3, a8, .Lbacksrcunaligned # then use shifting copy | |
400 | /* | |
401 | * Destination and source are word-aligned, use word copy. | |
402 | */ | |
403 | # copy 16 bytes per iteration for word-aligned dst and word-aligned src | |
404 | #if XCHAL_HAVE_LOOPS | |
405 | loopnez a7, .backLoop1done | |
406 | #else /* !XCHAL_HAVE_LOOPS */ | |
407 | beqz a7, .backLoop1done | |
408 | slli a8, a7, 4 | |
409 | sub a8, a3, a8 # a8 = start of first 16B source chunk | |
410 | #endif /* !XCHAL_HAVE_LOOPS */ | |
411 | .backLoop1: | |
412 | addi a3, a3, -16 | |
413 | l32i a7, a3, 12 | |
414 | l32i a6, a3, 8 | |
415 | addi a5, a5, -16 | |
416 | s32i a7, a5, 12 | |
417 | l32i a7, a3, 4 | |
418 | s32i a6, a5, 8 | |
419 | l32i a6, a3, 0 | |
420 | s32i a7, a5, 4 | |
421 | s32i a6, a5, 0 | |
422 | #if !XCHAL_HAVE_LOOPS | |
423 | bne a3, a8, .backLoop1 # continue loop if a3:src != a8:src_start | |
424 | #endif /* !XCHAL_HAVE_LOOPS */ | |
425 | .backLoop1done: | |
426 | bbci.l a4, 3, .Lback2 | |
427 | # copy 8 bytes | |
428 | addi a3, a3, -8 | |
429 | l32i a6, a3, 0 | |
430 | l32i a7, a3, 4 | |
431 | addi a5, a5, -8 | |
432 | s32i a6, a5, 0 | |
433 | s32i a7, a5, 4 | |
434 | .Lback2: | |
435 | bbsi.l a4, 2, .Lback3 | |
436 | bbsi.l a4, 1, .Lback4 | |
437 | bbsi.l a4, 0, .Lback5 | |
438 | retw | |
439 | .Lback3: | |
440 | # copy 4 bytes | |
441 | addi a3, a3, -4 | |
442 | l32i a6, a3, 0 | |
443 | addi a5, a5, -4 | |
444 | s32i a6, a5, 0 | |
445 | bbsi.l a4, 1, .Lback4 | |
446 | bbsi.l a4, 0, .Lback5 | |
447 | retw | |
448 | .Lback4: | |
449 | # copy 2 bytes | |
450 | addi a3, a3, -2 | |
451 | l16ui a6, a3, 0 | |
452 | addi a5, a5, -2 | |
453 | s16i a6, a5, 0 | |
454 | bbsi.l a4, 0, .Lback5 | |
455 | retw | |
456 | .Lback5: | |
457 | # copy 1 byte | |
458 | addi a3, a3, -1 | |
459 | l8ui a6, a3, 0 | |
460 | addi a5, a5, -1 | |
461 | s8i a6, a5, 0 | |
462 | retw | |
463 | ||
464 | /* | |
465 | * Destination is aligned, Source is unaligned | |
466 | */ | |
467 | ||
468 | .align 4 | |
469 | .Lbacksrcunaligned: | |
470 | _beqz a4, .Lbackdone # avoid loading anything for zero-length copies | |
471 | # copy 16 bytes per iteration for word-aligned dst and unaligned src | |
fbb871e2 | 472 | __ssa8 a3 # set shift amount from byte offset |
eae8a416 CZ |
473 | #define SIM_CHECKS_ALIGNMENT 1 /* set to 1 when running on ISS with |
474 | * the lint or ferret client, or 0 | |
475 | * to save a few cycles */ | |
476 | #if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT | |
477 | and a11, a3, a8 # save unalignment offset for below | |
478 | sub a3, a3, a11 # align a3 | |
479 | #endif | |
480 | l32i a6, a3, 0 # load first word | |
481 | #if XCHAL_HAVE_LOOPS | |
482 | loopnez a7, .backLoop2done | |
483 | #else /* !XCHAL_HAVE_LOOPS */ | |
484 | beqz a7, .backLoop2done | |
485 | slli a10, a7, 4 | |
486 | sub a10, a3, a10 # a10 = start of first 16B source chunk | |
487 | #endif /* !XCHAL_HAVE_LOOPS */ | |
488 | .backLoop2: | |
489 | addi a3, a3, -16 | |
490 | l32i a7, a3, 12 | |
491 | l32i a8, a3, 8 | |
492 | addi a5, a5, -16 | |
fbb871e2 | 493 | __src_b a6, a7, a6 |
eae8a416 CZ |
494 | s32i a6, a5, 12 |
495 | l32i a9, a3, 4 | |
fbb871e2 | 496 | __src_b a7, a8, a7 |
eae8a416 CZ |
497 | s32i a7, a5, 8 |
498 | l32i a6, a3, 0 | |
fbb871e2 | 499 | __src_b a8, a9, a8 |
eae8a416 | 500 | s32i a8, a5, 4 |
fbb871e2 | 501 | __src_b a9, a6, a9 |
eae8a416 CZ |
502 | s32i a9, a5, 0 |
503 | #if !XCHAL_HAVE_LOOPS | |
504 | bne a3, a10, .backLoop2 # continue loop if a3:src != a10:src_start | |
505 | #endif /* !XCHAL_HAVE_LOOPS */ | |
506 | .backLoop2done: | |
507 | bbci.l a4, 3, .Lback12 | |
508 | # copy 8 bytes | |
509 | addi a3, a3, -8 | |
510 | l32i a7, a3, 4 | |
511 | l32i a8, a3, 0 | |
512 | addi a5, a5, -8 | |
fbb871e2 | 513 | __src_b a6, a7, a6 |
eae8a416 | 514 | s32i a6, a5, 4 |
fbb871e2 | 515 | __src_b a7, a8, a7 |
eae8a416 CZ |
516 | s32i a7, a5, 0 |
517 | mov a6, a8 | |
518 | .Lback12: | |
519 | bbci.l a4, 2, .Lback13 | |
520 | # copy 4 bytes | |
521 | addi a3, a3, -4 | |
522 | l32i a7, a3, 0 | |
523 | addi a5, a5, -4 | |
fbb871e2 | 524 | __src_b a6, a7, a6 |
eae8a416 CZ |
525 | s32i a6, a5, 0 |
526 | mov a6, a7 | |
527 | .Lback13: | |
528 | #if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT | |
529 | add a3, a3, a11 # readjust a3 with correct misalignment | |
530 | #endif | |
531 | bbsi.l a4, 1, .Lback14 | |
532 | bbsi.l a4, 0, .Lback15 | |
533 | .Lbackdone: | |
534 | retw | |
535 | .Lback14: | |
536 | # copy 2 bytes | |
537 | addi a3, a3, -2 | |
538 | l8ui a6, a3, 0 | |
539 | l8ui a7, a3, 1 | |
540 | addi a5, a5, -2 | |
541 | s8i a6, a5, 0 | |
542 | s8i a7, a5, 1 | |
543 | bbsi.l a4, 0, .Lback15 | |
544 | retw | |
545 | .Lback15: | |
546 | # copy 1 byte | |
547 | addi a3, a3, -1 | |
548 | addi a5, a5, -1 | |
549 | l8ui a6, a3, 0 | |
550 | s8i a6, a5, 0 | |
551 | retw | |
552 | ||
c633544a | 553 | ENDPROC(__memmove) |