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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 | ||
367b8112 | 12 | #include <variant/core.h> |
249ac17e CZ |
13 | |
14 | .macro src_b r, w0, w1 | |
15 | #ifdef __XTENSA_EB__ | |
16 | src \r, \w0, \w1 | |
17 | #else | |
18 | src \r, \w1, \w0 | |
19 | #endif | |
20 | .endm | |
21 | ||
22 | .macro ssa8 r | |
23 | #ifdef __XTENSA_EB__ | |
24 | ssa8b \r | |
25 | #else | |
26 | ssa8l \r | |
27 | #endif | |
28 | .endm | |
29 | ||
249ac17e CZ |
30 | /* |
31 | * void *memcpy(void *dst, const void *src, size_t len); | |
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32 | * |
33 | * This function is intended to do the same thing as the standard | |
eae8a416 | 34 | * library function memcpy() for most cases. |
249ac17e CZ |
35 | * However, where the source and/or destination references |
36 | * an instruction RAM or ROM or a data RAM or ROM, that | |
37 | * source and/or destination will always be accessed with | |
38 | * 32-bit load and store instructions (as required for these | |
39 | * types of devices). | |
40 | * | |
41 | * !!!!!!! XTFIXME: | |
42 | * !!!!!!! Handling of IRAM/IROM has not yet | |
43 | * !!!!!!! been implemented. | |
44 | * | |
249ac17e CZ |
45 | * The (general case) algorithm is as follows: |
46 | * If destination is unaligned, align it by conditionally | |
47 | * copying 1 and 2 bytes. | |
48 | * If source is aligned, | |
49 | * do 16 bytes with a loop, and then finish up with | |
50 | * 8, 4, 2, and 1 byte copies conditional on the length; | |
51 | * else (if source is unaligned), | |
52 | * do the same, but use SRC to align the source data. | |
53 | * This code tries to use fall-through branches for the common | |
54 | * case of aligned source and destination and multiple | |
55 | * of 4 (or 8) length. | |
56 | * | |
57 | * Register use: | |
58 | * a0/ return address | |
59 | * a1/ stack pointer | |
60 | * a2/ return value | |
61 | * a3/ src | |
62 | * a4/ length | |
63 | * a5/ dst | |
64 | * a6/ tmp | |
65 | * a7/ tmp | |
66 | * a8/ tmp | |
67 | * a9/ tmp | |
68 | * a10/ tmp | |
69 | * a11/ tmp | |
70 | */ | |
71 | ||
72 | .text | |
249ac17e CZ |
73 | |
74 | /* | |
75 | * Byte by byte copy | |
76 | */ | |
77 | .align 4 | |
78 | .byte 0 # 1 mod 4 alignment for LOOPNEZ | |
79 | # (0 mod 4 alignment for LBEG) | |
80 | .Lbytecopy: | |
81 | #if XCHAL_HAVE_LOOPS | |
82 | loopnez a4, .Lbytecopydone | |
83 | #else /* !XCHAL_HAVE_LOOPS */ | |
84 | beqz a4, .Lbytecopydone | |
85 | add a7, a3, a4 # a7 = end address for source | |
86 | #endif /* !XCHAL_HAVE_LOOPS */ | |
87 | .Lnextbyte: | |
88 | l8ui a6, a3, 0 | |
89 | addi a3, a3, 1 | |
90 | s8i a6, a5, 0 | |
91 | addi a5, a5, 1 | |
92 | #if !XCHAL_HAVE_LOOPS | |
eae8a416 | 93 | bne a3, a7, .Lnextbyte # continue loop if $a3:src != $a7:src_end |
249ac17e CZ |
94 | #endif /* !XCHAL_HAVE_LOOPS */ |
95 | .Lbytecopydone: | |
96 | retw | |
97 | ||
98 | /* | |
99 | * Destination is unaligned | |
100 | */ | |
101 | ||
102 | .align 4 | |
103 | .Ldst1mod2: # dst is only byte aligned | |
104 | _bltui a4, 7, .Lbytecopy # do short copies byte by byte | |
105 | ||
106 | # copy 1 byte | |
107 | l8ui a6, a3, 0 | |
108 | addi a3, a3, 1 | |
109 | addi a4, a4, -1 | |
110 | s8i a6, a5, 0 | |
111 | addi a5, a5, 1 | |
112 | _bbci.l a5, 1, .Ldstaligned # if dst is now aligned, then | |
113 | # return to main algorithm | |
114 | .Ldst2mod4: # dst 16-bit aligned | |
115 | # copy 2 bytes | |
116 | _bltui a4, 6, .Lbytecopy # do short copies byte by byte | |
117 | l8ui a6, a3, 0 | |
118 | l8ui a7, a3, 1 | |
119 | addi a3, a3, 2 | |
120 | addi a4, a4, -2 | |
121 | s8i a6, a5, 0 | |
122 | s8i a7, a5, 1 | |
123 | addi a5, a5, 2 | |
124 | j .Ldstaligned # dst is now aligned, return to main algorithm | |
125 | ||
126 | .align 4 | |
127 | .global memcpy | |
128 | .type memcpy,@function | |
129 | memcpy: | |
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130 | |
131 | entry sp, 16 # minimal stack frame | |
132 | # a2/ dst, a3/ src, a4/ len | |
133 | mov a5, a2 # copy dst so that a2 is return value | |
134 | .Lcommon: | |
135 | _bbsi.l a2, 0, .Ldst1mod2 # if dst is 1 mod 2 | |
136 | _bbsi.l a2, 1, .Ldst2mod4 # if dst is 2 mod 4 | |
137 | .Ldstaligned: # return here from .Ldst?mod? once dst is aligned | |
138 | srli a7, a4, 4 # number of loop iterations with 16B | |
139 | # per iteration | |
140 | movi a8, 3 # if source is not aligned, | |
141 | _bany a3, a8, .Lsrcunaligned # then use shifting copy | |
142 | /* | |
143 | * Destination and source are word-aligned, use word copy. | |
144 | */ | |
145 | # copy 16 bytes per iteration for word-aligned dst and word-aligned src | |
146 | #if XCHAL_HAVE_LOOPS | |
147 | loopnez a7, .Loop1done | |
148 | #else /* !XCHAL_HAVE_LOOPS */ | |
149 | beqz a7, .Loop1done | |
150 | slli a8, a7, 4 | |
151 | add a8, a8, a3 # a8 = end of last 16B source chunk | |
152 | #endif /* !XCHAL_HAVE_LOOPS */ | |
153 | .Loop1: | |
154 | l32i a6, a3, 0 | |
155 | l32i a7, a3, 4 | |
156 | s32i a6, a5, 0 | |
157 | l32i a6, a3, 8 | |
158 | s32i a7, a5, 4 | |
159 | l32i a7, a3, 12 | |
160 | s32i a6, a5, 8 | |
161 | addi a3, a3, 16 | |
162 | s32i a7, a5, 12 | |
163 | addi a5, a5, 16 | |
164 | #if !XCHAL_HAVE_LOOPS | |
eae8a416 | 165 | bne a3, a8, .Loop1 # continue loop if a3:src != a8:src_end |
249ac17e CZ |
166 | #endif /* !XCHAL_HAVE_LOOPS */ |
167 | .Loop1done: | |
168 | bbci.l a4, 3, .L2 | |
169 | # copy 8 bytes | |
170 | l32i a6, a3, 0 | |
171 | l32i a7, a3, 4 | |
172 | addi a3, a3, 8 | |
173 | s32i a6, a5, 0 | |
174 | s32i a7, a5, 4 | |
175 | addi a5, a5, 8 | |
176 | .L2: | |
177 | bbsi.l a4, 2, .L3 | |
178 | bbsi.l a4, 1, .L4 | |
179 | bbsi.l a4, 0, .L5 | |
180 | retw | |
181 | .L3: | |
182 | # copy 4 bytes | |
183 | l32i a6, a3, 0 | |
184 | addi a3, a3, 4 | |
185 | s32i a6, a5, 0 | |
186 | addi a5, a5, 4 | |
187 | bbsi.l a4, 1, .L4 | |
188 | bbsi.l a4, 0, .L5 | |
189 | retw | |
190 | .L4: | |
191 | # copy 2 bytes | |
192 | l16ui a6, a3, 0 | |
193 | addi a3, a3, 2 | |
194 | s16i a6, a5, 0 | |
195 | addi a5, a5, 2 | |
196 | bbsi.l a4, 0, .L5 | |
197 | retw | |
198 | .L5: | |
199 | # copy 1 byte | |
200 | l8ui a6, a3, 0 | |
201 | s8i a6, a5, 0 | |
202 | retw | |
203 | ||
204 | /* | |
205 | * Destination is aligned, Source is unaligned | |
206 | */ | |
207 | ||
208 | .align 4 | |
209 | .Lsrcunaligned: | |
210 | _beqz a4, .Ldone # avoid loading anything for zero-length copies | |
211 | # copy 16 bytes per iteration for word-aligned dst and unaligned src | |
212 | ssa8 a3 # set shift amount from byte offset | |
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213 | |
214 | /* set to 1 when running on ISS (simulator) with the | |
215 | lint or ferret client, or 0 to save a few cycles */ | |
216 | #define SIM_CHECKS_ALIGNMENT 1 | |
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217 | #if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT |
218 | and a11, a3, a8 # save unalignment offset for below | |
219 | sub a3, a3, a11 # align a3 | |
220 | #endif | |
221 | l32i a6, a3, 0 # load first word | |
222 | #if XCHAL_HAVE_LOOPS | |
223 | loopnez a7, .Loop2done | |
224 | #else /* !XCHAL_HAVE_LOOPS */ | |
225 | beqz a7, .Loop2done | |
226 | slli a10, a7, 4 | |
227 | add a10, a10, a3 # a10 = end of last 16B source chunk | |
228 | #endif /* !XCHAL_HAVE_LOOPS */ | |
229 | .Loop2: | |
230 | l32i a7, a3, 4 | |
231 | l32i a8, a3, 8 | |
232 | src_b a6, a6, a7 | |
233 | s32i a6, a5, 0 | |
234 | l32i a9, a3, 12 | |
235 | src_b a7, a7, a8 | |
236 | s32i a7, a5, 4 | |
237 | l32i a6, a3, 16 | |
238 | src_b a8, a8, a9 | |
239 | s32i a8, a5, 8 | |
240 | addi a3, a3, 16 | |
241 | src_b a9, a9, a6 | |
242 | s32i a9, a5, 12 | |
243 | addi a5, a5, 16 | |
244 | #if !XCHAL_HAVE_LOOPS | |
eae8a416 | 245 | bne a3, a10, .Loop2 # continue loop if a3:src != a10:src_end |
249ac17e CZ |
246 | #endif /* !XCHAL_HAVE_LOOPS */ |
247 | .Loop2done: | |
248 | bbci.l a4, 3, .L12 | |
249 | # copy 8 bytes | |
250 | l32i a7, a3, 4 | |
251 | l32i a8, a3, 8 | |
252 | src_b a6, a6, a7 | |
253 | s32i a6, a5, 0 | |
254 | addi a3, a3, 8 | |
255 | src_b a7, a7, a8 | |
256 | s32i a7, a5, 4 | |
257 | addi a5, a5, 8 | |
258 | mov a6, a8 | |
259 | .L12: | |
260 | bbci.l a4, 2, .L13 | |
261 | # copy 4 bytes | |
262 | l32i a7, a3, 4 | |
263 | addi a3, a3, 4 | |
264 | src_b a6, a6, a7 | |
265 | s32i a6, a5, 0 | |
266 | addi a5, a5, 4 | |
267 | mov a6, a7 | |
268 | .L13: | |
269 | #if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT | |
270 | add a3, a3, a11 # readjust a3 with correct misalignment | |
271 | #endif | |
272 | bbsi.l a4, 1, .L14 | |
273 | bbsi.l a4, 0, .L15 | |
274 | .Ldone: retw | |
275 | .L14: | |
276 | # copy 2 bytes | |
277 | l8ui a6, a3, 0 | |
278 | l8ui a7, a3, 1 | |
279 | addi a3, a3, 2 | |
280 | s8i a6, a5, 0 | |
281 | s8i a7, a5, 1 | |
282 | addi a5, a5, 2 | |
283 | bbsi.l a4, 0, .L15 | |
284 | retw | |
285 | .L15: | |
286 | # copy 1 byte | |
287 | l8ui a6, a3, 0 | |
288 | s8i a6, a5, 0 | |
289 | retw | |
eae8a416 CZ |
290 | |
291 | ||
292 | /* | |
293 | * void bcopy(const void *src, void *dest, size_t n); | |
294 | */ | |
295 | .align 4 | |
296 | .global bcopy | |
297 | .type bcopy,@function | |
298 | bcopy: | |
299 | entry sp, 16 # minimal stack frame | |
300 | # a2=src, a3=dst, a4=len | |
301 | mov a5, a3 | |
302 | mov a3, a2 | |
303 | mov a2, a5 | |
304 | j .Lmovecommon # go to common code for memmove+bcopy | |
305 | ||
306 | /* | |
307 | * void *memmove(void *dst, const void *src, size_t len); | |
308 | * | |
309 | * This function is intended to do the same thing as the standard | |
310 | * library function memmove() for most cases. | |
311 | * However, where the source and/or destination references | |
312 | * an instruction RAM or ROM or a data RAM or ROM, that | |
313 | * source and/or destination will always be accessed with | |
314 | * 32-bit load and store instructions (as required for these | |
315 | * types of devices). | |
316 | * | |
317 | * !!!!!!! XTFIXME: | |
318 | * !!!!!!! Handling of IRAM/IROM has not yet | |
319 | * !!!!!!! been implemented. | |
320 | * | |
321 | * The (general case) algorithm is as follows: | |
322 | * If end of source doesn't overlap destination then use memcpy. | |
323 | * Otherwise do memcpy backwards. | |
324 | * | |
325 | * Register use: | |
326 | * a0/ return address | |
327 | * a1/ stack pointer | |
328 | * a2/ return value | |
329 | * a3/ src | |
330 | * a4/ length | |
331 | * a5/ dst | |
332 | * a6/ tmp | |
333 | * a7/ tmp | |
334 | * a8/ tmp | |
335 | * a9/ tmp | |
336 | * a10/ tmp | |
337 | * a11/ tmp | |
338 | */ | |
339 | ||
340 | /* | |
341 | * Byte by byte copy | |
342 | */ | |
343 | .align 4 | |
344 | .byte 0 # 1 mod 4 alignment for LOOPNEZ | |
345 | # (0 mod 4 alignment for LBEG) | |
346 | .Lbackbytecopy: | |
347 | #if XCHAL_HAVE_LOOPS | |
348 | loopnez a4, .Lbackbytecopydone | |
349 | #else /* !XCHAL_HAVE_LOOPS */ | |
350 | beqz a4, .Lbackbytecopydone | |
351 | sub a7, a3, a4 # a7 = start address for source | |
352 | #endif /* !XCHAL_HAVE_LOOPS */ | |
353 | .Lbacknextbyte: | |
354 | addi a3, a3, -1 | |
355 | l8ui a6, a3, 0 | |
356 | addi a5, a5, -1 | |
357 | s8i a6, a5, 0 | |
358 | #if !XCHAL_HAVE_LOOPS | |
359 | bne a3, a7, .Lbacknextbyte # continue loop if | |
360 | # $a3:src != $a7:src_start | |
361 | #endif /* !XCHAL_HAVE_LOOPS */ | |
362 | .Lbackbytecopydone: | |
363 | retw | |
364 | ||
365 | /* | |
366 | * Destination is unaligned | |
367 | */ | |
368 | ||
369 | .align 4 | |
370 | .Lbackdst1mod2: # dst is only byte aligned | |
371 | _bltui a4, 7, .Lbackbytecopy # do short copies byte by byte | |
372 | ||
373 | # copy 1 byte | |
374 | addi a3, a3, -1 | |
375 | l8ui a6, a3, 0 | |
376 | addi a5, a5, -1 | |
377 | s8i a6, a5, 0 | |
378 | addi a4, a4, -1 | |
379 | _bbci.l a5, 1, .Lbackdstaligned # if dst is now aligned, then | |
380 | # return to main algorithm | |
381 | .Lbackdst2mod4: # dst 16-bit aligned | |
382 | # copy 2 bytes | |
383 | _bltui a4, 6, .Lbackbytecopy # do short copies byte by byte | |
384 | addi a3, a3, -2 | |
385 | l8ui a6, a3, 0 | |
386 | l8ui a7, a3, 1 | |
387 | addi a5, a5, -2 | |
388 | s8i a6, a5, 0 | |
389 | s8i a7, a5, 1 | |
390 | addi a4, a4, -2 | |
391 | j .Lbackdstaligned # dst is now aligned, | |
392 | # return to main algorithm | |
393 | ||
394 | .align 4 | |
395 | .global memmove | |
396 | .type memmove,@function | |
397 | memmove: | |
398 | ||
399 | entry sp, 16 # minimal stack frame | |
400 | # a2/ dst, a3/ src, a4/ len | |
401 | mov a5, a2 # copy dst so that a2 is return value | |
402 | .Lmovecommon: | |
403 | sub a6, a5, a3 | |
404 | bgeu a6, a4, .Lcommon | |
405 | ||
406 | add a5, a5, a4 | |
407 | add a3, a3, a4 | |
408 | ||
409 | _bbsi.l a5, 0, .Lbackdst1mod2 # if dst is 1 mod 2 | |
410 | _bbsi.l a5, 1, .Lbackdst2mod4 # if dst is 2 mod 4 | |
411 | .Lbackdstaligned: # return here from .Lbackdst?mod? once dst is aligned | |
412 | srli a7, a4, 4 # number of loop iterations with 16B | |
413 | # per iteration | |
414 | movi a8, 3 # if source is not aligned, | |
415 | _bany a3, a8, .Lbacksrcunaligned # then use shifting copy | |
416 | /* | |
417 | * Destination and source are word-aligned, use word copy. | |
418 | */ | |
419 | # copy 16 bytes per iteration for word-aligned dst and word-aligned src | |
420 | #if XCHAL_HAVE_LOOPS | |
421 | loopnez a7, .backLoop1done | |
422 | #else /* !XCHAL_HAVE_LOOPS */ | |
423 | beqz a7, .backLoop1done | |
424 | slli a8, a7, 4 | |
425 | sub a8, a3, a8 # a8 = start of first 16B source chunk | |
426 | #endif /* !XCHAL_HAVE_LOOPS */ | |
427 | .backLoop1: | |
428 | addi a3, a3, -16 | |
429 | l32i a7, a3, 12 | |
430 | l32i a6, a3, 8 | |
431 | addi a5, a5, -16 | |
432 | s32i a7, a5, 12 | |
433 | l32i a7, a3, 4 | |
434 | s32i a6, a5, 8 | |
435 | l32i a6, a3, 0 | |
436 | s32i a7, a5, 4 | |
437 | s32i a6, a5, 0 | |
438 | #if !XCHAL_HAVE_LOOPS | |
439 | bne a3, a8, .backLoop1 # continue loop if a3:src != a8:src_start | |
440 | #endif /* !XCHAL_HAVE_LOOPS */ | |
441 | .backLoop1done: | |
442 | bbci.l a4, 3, .Lback2 | |
443 | # copy 8 bytes | |
444 | addi a3, a3, -8 | |
445 | l32i a6, a3, 0 | |
446 | l32i a7, a3, 4 | |
447 | addi a5, a5, -8 | |
448 | s32i a6, a5, 0 | |
449 | s32i a7, a5, 4 | |
450 | .Lback2: | |
451 | bbsi.l a4, 2, .Lback3 | |
452 | bbsi.l a4, 1, .Lback4 | |
453 | bbsi.l a4, 0, .Lback5 | |
454 | retw | |
455 | .Lback3: | |
456 | # copy 4 bytes | |
457 | addi a3, a3, -4 | |
458 | l32i a6, a3, 0 | |
459 | addi a5, a5, -4 | |
460 | s32i a6, a5, 0 | |
461 | bbsi.l a4, 1, .Lback4 | |
462 | bbsi.l a4, 0, .Lback5 | |
463 | retw | |
464 | .Lback4: | |
465 | # copy 2 bytes | |
466 | addi a3, a3, -2 | |
467 | l16ui a6, a3, 0 | |
468 | addi a5, a5, -2 | |
469 | s16i a6, a5, 0 | |
470 | bbsi.l a4, 0, .Lback5 | |
471 | retw | |
472 | .Lback5: | |
473 | # copy 1 byte | |
474 | addi a3, a3, -1 | |
475 | l8ui a6, a3, 0 | |
476 | addi a5, a5, -1 | |
477 | s8i a6, a5, 0 | |
478 | retw | |
479 | ||
480 | /* | |
481 | * Destination is aligned, Source is unaligned | |
482 | */ | |
483 | ||
484 | .align 4 | |
485 | .Lbacksrcunaligned: | |
486 | _beqz a4, .Lbackdone # avoid loading anything for zero-length copies | |
487 | # copy 16 bytes per iteration for word-aligned dst and unaligned src | |
488 | ssa8 a3 # set shift amount from byte offset | |
489 | #define SIM_CHECKS_ALIGNMENT 1 /* set to 1 when running on ISS with | |
490 | * the lint or ferret client, or 0 | |
491 | * to save a few cycles */ | |
492 | #if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT | |
493 | and a11, a3, a8 # save unalignment offset for below | |
494 | sub a3, a3, a11 # align a3 | |
495 | #endif | |
496 | l32i a6, a3, 0 # load first word | |
497 | #if XCHAL_HAVE_LOOPS | |
498 | loopnez a7, .backLoop2done | |
499 | #else /* !XCHAL_HAVE_LOOPS */ | |
500 | beqz a7, .backLoop2done | |
501 | slli a10, a7, 4 | |
502 | sub a10, a3, a10 # a10 = start of first 16B source chunk | |
503 | #endif /* !XCHAL_HAVE_LOOPS */ | |
504 | .backLoop2: | |
505 | addi a3, a3, -16 | |
506 | l32i a7, a3, 12 | |
507 | l32i a8, a3, 8 | |
508 | addi a5, a5, -16 | |
509 | src_b a6, a7, a6 | |
510 | s32i a6, a5, 12 | |
511 | l32i a9, a3, 4 | |
512 | src_b a7, a8, a7 | |
513 | s32i a7, a5, 8 | |
514 | l32i a6, a3, 0 | |
515 | src_b a8, a9, a8 | |
516 | s32i a8, a5, 4 | |
517 | src_b a9, a6, a9 | |
518 | s32i a9, a5, 0 | |
519 | #if !XCHAL_HAVE_LOOPS | |
520 | bne a3, a10, .backLoop2 # continue loop if a3:src != a10:src_start | |
521 | #endif /* !XCHAL_HAVE_LOOPS */ | |
522 | .backLoop2done: | |
523 | bbci.l a4, 3, .Lback12 | |
524 | # copy 8 bytes | |
525 | addi a3, a3, -8 | |
526 | l32i a7, a3, 4 | |
527 | l32i a8, a3, 0 | |
528 | addi a5, a5, -8 | |
529 | src_b a6, a7, a6 | |
530 | s32i a6, a5, 4 | |
531 | src_b a7, a8, a7 | |
532 | s32i a7, a5, 0 | |
533 | mov a6, a8 | |
534 | .Lback12: | |
535 | bbci.l a4, 2, .Lback13 | |
536 | # copy 4 bytes | |
537 | addi a3, a3, -4 | |
538 | l32i a7, a3, 0 | |
539 | addi a5, a5, -4 | |
540 | src_b a6, a7, a6 | |
541 | s32i a6, a5, 0 | |
542 | mov a6, a7 | |
543 | .Lback13: | |
544 | #if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT | |
545 | add a3, a3, a11 # readjust a3 with correct misalignment | |
546 | #endif | |
547 | bbsi.l a4, 1, .Lback14 | |
548 | bbsi.l a4, 0, .Lback15 | |
549 | .Lbackdone: | |
550 | retw | |
551 | .Lback14: | |
552 | # copy 2 bytes | |
553 | addi a3, a3, -2 | |
554 | l8ui a6, a3, 0 | |
555 | l8ui a7, a3, 1 | |
556 | addi a5, a5, -2 | |
557 | s8i a6, a5, 0 | |
558 | s8i a7, a5, 1 | |
559 | bbsi.l a4, 0, .Lback15 | |
560 | retw | |
561 | .Lback15: | |
562 | # copy 1 byte | |
563 | addi a3, a3, -1 | |
564 | addi a5, a5, -1 | |
565 | l8ui a6, a3, 0 | |
566 | s8i a6, a5, 0 | |
567 | retw | |
568 | ||
249ac17e CZ |
569 | \f |
570 | /* | |
571 | * Local Variables: | |
572 | * mode:fundamental | |
573 | * comment-start: "# " | |
574 | * comment-start-skip: "# *" | |
575 | * End: | |
576 | */ |