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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [include/] [asm-i386/] [string-486.h] - Blame information for rev 1765

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1 1633 jcastillo 
#ifndef _I386_STRING_I486_H_
2 
#define _I386_STRING_I486_H_
3 
 
4 
/*
5 
 * This string-include defines all string functions as inline
6 
 * functions. Use gcc. It also assumes ds=es=data space, this should be
7 
 * normal. Most of the string-functions are rather heavily hand-optimized,
8 
 * see especially strtok,strstr,str[c]spn. They should work, but are not
9 
 * very easy to understand. Everything is done entirely within the register
10 
 * set, making the functions fast and clean.
11 
 *
12 
 *              Copyright (C) 1991, 1992 Linus Torvalds
13 
 *              Revised and optimized for i486/pentium
14 
 *              1994/03/15 by Alberto Vignani/Davide Parodi @crf.it
15 
 *
16 
 *      Split into 2 CPU specific files by Alan Cox to keep #ifdef noise down.
17 
 */
18 
 
19 
#define __HAVE_ARCH_STRCPY
20 
extern inline char * strcpy(char * dest,const char *src)
21 
{
22 
register char *tmp= (char *)dest;
23 
register char dummy;
24 
__asm__ __volatile__(
25 
        "\n1:\t"
26 
        "movb (%0),%b2\n\t"
27 
        "incl %0\n\t"
28 
        "movb %b2,(%1)\n\t"
29 
        "incl %1\n\t"
30 
        "testb %b2,%b2\n\t"
31 
        "jne 1b"
32 
        :"=r" (src), "=r" (tmp), "=q" (dummy)
33 
        :"0" (src), "1" (tmp)
34 
        :"memory");
35 
return dest;
36 
}
37 
 
38 
#define __HAVE_ARCH_STRNCPY
39 
extern inline char * strncpy(char * dest,const char *src,size_t count)
40 
{
41 
register char *tmp= (char *)dest;
42 
register char dummy;
43 
if (count) {
44 
__asm__ __volatile__(
45 
        "\n1:\t"
46 
        "movb (%0),%b2\n\t"
47 
        "incl %0\n\t"
48 
        "movb %b2,(%1)\n\t"
49 
        "incl %1\n\t"
50 
        "decl %3\n\t"
51 
        "je 3f\n\t"
52 
        "testb %b2,%b2\n\t"
53 
        "jne 1b\n\t"
54 
        "2:\tmovb %b2,(%1)\n\t"
55 
        "incl %1\n\t"
56 
        "decl %3\n\t"
57 
        "jne 2b\n\t"
58 
        "3:"
59 
        :"=r" (src), "=r" (tmp), "=q" (dummy), "=r" (count)
60 
        :"0" (src), "1" (tmp), "3" (count)
61 
        :"memory");
62 
    } /* if (count) */
63 
return dest;
64 
}
65 
 
66 
#define __HAVE_ARCH_STRCAT
67 
extern inline char * strcat(char * dest,const char * src)
68 
{
69 
register char *tmp = (char *)(dest-1);
70 
register char dummy;
71 
__asm__ __volatile__(
72 
        "\n1:\tincl %1\n\t"
73 
        "cmpb $0,(%1)\n\t"
74 
        "jne 1b\n"
75 
        "2:\tmovb (%2),%b0\n\t"
76 
        "incl %2\n\t"
77 
        "movb %b0,(%1)\n\t"
78 
        "incl %1\n\t"
79 
        "testb %b0,%b0\n\t"
80 
        "jne 2b\n"
81 
        :"=q" (dummy), "=r" (tmp), "=r" (src)
82 
        :"1"  (tmp), "2"  (src)
83 
        :"memory");
84 
return dest;
85 
}
86 
 
87 
#define __HAVE_ARCH_STRNCAT
88 
extern inline char * strncat(char * dest,const char * src,size_t count)
89 
{
90 
register char *tmp = (char *)(dest-1);
91 
register char dummy;
92 
__asm__ __volatile__(
93 
        "\n1:\tincl %1\n\t"
94 
        "cmpb $0,(%1)\n\t"
95 
        "jne 1b\n"
96 
        "2:\tdecl %3\n\t"
97 
        "js 3f\n\t"
98 
        "movb (%2),%b0\n\t"
99 
        "incl %2\n\t"
100 
        "movb %b0,(%1)\n\t"
101 
        "incl %1\n\t"
102 
        "testb %b0,%b0\n\t"
103 
        "jne 2b\n"
104 
        "3:\txorb %b0,%b0\n\t"
105 
        "movb %b0,(%1)\n\t"
106 
        :"=q" (dummy), "=r" (tmp), "=r" (src), "=r" (count)
107 
        :"1"  (tmp), "2"  (src), "3"  (count)
108 
        :"memory");
109 
return dest;
110 
}
111 
 
112 
#define __HAVE_ARCH_STRCMP
113 
extern inline int strcmp(const char * cs,const char * ct)
114 
{
115 
register int __res;
116 
__asm__ __volatile__(
117 
        "\n1:\tmovb (%1),%b0\n\t"
118 
        "incl %1\n\t"
119 
        "cmpb %b0,(%2)\n\t"
120 
        "jne 2f\n\t"
121 
        "incl %2\n\t"
122 
        "testb %b0,%b0\n\t"
123 
        "jne 1b\n\t"
124 
        "xorl %k0,%k0\n\t"
125 
        "jmp 3f\n"
126 
        "2:\tmovl $1,%k0\n\t"
127 
        "jb 3f\n\t"
128 
        "negl %k0\n"
129 
        "3:"
130 
        :"=q" (__res), "=r" (cs), "=r" (ct)
131 
        :"1" (cs), "2" (ct)
132 
        : "memory" );
133 
return __res;
134 
}
135 
 
136 
#define __HAVE_ARCH_STRNCMP
137 
extern inline int strncmp(const char * cs,const char * ct,size_t count)
138 
{
139 
register int __res;
140 
__asm__ __volatile__(
141 
        "\n1:\tdecl %3\n\t"
142 
        "js 2f\n\t"
143 
        "movb (%1),%b0\n\t"
144 
        "incl %1\n\t"
145 
        "cmpb %b0,(%2)\n\t"
146 
        "jne 3f\n\t"
147 
        "incl %2\n\t"
148 
        "testb %b0,%b0\n\t"
149 
        "jne 1b\n"
150 
        "2:\txorl %k0,%k0\n\t"
151 
        "jmp 4f\n"
152 
        "3:\tmovl $1,%k0\n\t"
153 
        "jb 4f\n\t"
154 
        "negl %k0\n"
155 
        "4:"
156 
        :"=q" (__res), "=r" (cs), "=r" (ct), "=r" (count)
157 
        :"1"  (cs), "2"  (ct),  "3" (count));
158 
return __res;
159 
}
160 
 
161 
#define __HAVE_ARCH_STRCHR
162 
extern inline char * strchr(const char * s, int c)
163 
{
164 
register char * __res;
165 
__asm__ __volatile__(
166 
        "movb %%al,%%ah\n"
167 
        "1:\tmovb (%1),%%al\n\t"
168 
        "cmpb %%ah,%%al\n\t"
169 
        "je 2f\n\t"
170 
        "incl %1\n\t"
171 
        "testb %%al,%%al\n\t"
172 
        "jne 1b\n\t"
173 
        "xorl %1,%1\n"
174 
        "2:\tmovl %1,%0\n\t"
175 
        :"=a" (__res), "=r" (s)
176 
        :"0" (c),      "1"  (s));
177 
return __res;
178 
}
179 
 
180 
#define __HAVE_ARCH_STRRCHR
181 
extern inline char * strrchr(const char * s, int c)
182 
{
183 
register char * __res;
184 
__asm__ __volatile__(
185 
        "cld\n\t"
186 
        "movb %%al,%%ah\n"
187 
        "1:\tlodsb\n\t"
188 
        "cmpb %%ah,%%al\n\t"
189 
        "jne 2f\n\t"
190 
        "leal -1(%%esi),%0\n"
191 
        "2:\ttestb %%al,%%al\n\t"
192 
        "jne 1b"
193 
        :"=d" (__res):"0" (0),"S" (s),"a" (c):"ax","si");
194 
return __res;
195 
}
196 
 
197 
#define __HAVE_ARCH_STRSPN
198 
extern inline size_t strspn(const char * cs, const char * ct)
199 
{
200 
register char * __res;
201 
__asm__ __volatile__(
202 
        "cld\n\t"
203 
        "movl %4,%%edi\n\t"
204 
        "repne\n\t"
205 
        "scasb\n\t"
206 
        "notl %%ecx\n\t"
207 
        "decl %%ecx\n\t"
208 
        "movl %%ecx,%%edx\n"
209 
        "1:\tlodsb\n\t"
210 
        "testb %%al,%%al\n\t"
211 
        "je 2f\n\t"
212 
        "movl %4,%%edi\n\t"
213 
        "movl %%edx,%%ecx\n\t"
214 
        "repne\n\t"
215 
        "scasb\n\t"
216 
        "je 1b\n"
217 
        "2:\tdecl %0"
218 
        :"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
219 
        :"ax","cx","dx","di");
220 
return __res-cs;
221 
}
222 
 
223 
#define __HAVE_ARCH_STRCSPN
224 
extern inline size_t strcspn(const char * cs, const char * ct)
225 
{
226 
register char * __res;
227 
__asm__ __volatile__(
228 
        "cld\n\t"
229 
        "movl %4,%%edi\n\t"
230 
        "repne\n\t"
231 
        "scasb\n\t"
232 
        "notl %%ecx\n\t"
233 
        "decl %%ecx\n\t"
234 
        "movl %%ecx,%%edx\n"
235 
        "1:\tlodsb\n\t"
236 
        "testb %%al,%%al\n\t"
237 
        "je 2f\n\t"
238 
        "movl %4,%%edi\n\t"
239 
        "movl %%edx,%%ecx\n\t"
240 
        "repne\n\t"
241 
        "scasb\n\t"
242 
        "jne 1b\n"
243 
        "2:\tdecl %0"
244 
        :"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
245 
        :"ax","cx","dx","di");
246 
return __res-cs;
247 
}
248 
 
249 
#define __HAVE_ARCH_STRPBRK
250 
extern inline char * strpbrk(const char * cs,const char * ct)
251 
{
252 
register char * __res;
253 
__asm__ __volatile__(
254 
        "cld\n\t"
255 
        "movl %4,%%edi\n\t"
256 
        "repne\n\t"
257 
        "scasb\n\t"
258 
        "notl %%ecx\n\t"
259 
        "decl %%ecx\n\t"
260 
        "movl %%ecx,%%edx\n"
261 
        "1:\tlodsb\n\t"
262 
        "testb %%al,%%al\n\t"
263 
        "je 2f\n\t"
264 
        "movl %4,%%edi\n\t"
265 
        "movl %%edx,%%ecx\n\t"
266 
        "repne\n\t"
267 
        "scasb\n\t"
268 
        "jne 1b\n\t"
269 
        "decl %0\n\t"
270 
        "jmp 3f\n"
271 
        "2:\txorl %0,%0\n"
272 
        "3:"
273 
        :"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
274 
        :"ax","cx","dx","di");
275 
return __res;
276 
}
277 
 
278 
#define __HAVE_ARCH_STRSTR
279 
extern inline char * strstr(const char * cs,const char * ct)
280 
{
281 
register char * __res;
282 
__asm__ __volatile__(
283 
        "cld\n\t" \
284 
        "movl %4,%%edi\n\t"
285 
        "repne\n\t"
286 
        "scasb\n\t"
287 
        "notl %%ecx\n\t"
288 
        "decl %%ecx\n\t"        /* NOTE! This also sets Z if searchstring='' */
289 
        "movl %%ecx,%%edx\n"
290 
        "1:\tmovl %4,%%edi\n\t"
291 
        "movl %%esi,%%eax\n\t"
292 
        "movl %%edx,%%ecx\n\t"
293 
        "repe\n\t"
294 
        "cmpsb\n\t"
295 
        "je 2f\n\t"             /* also works for empty string, see above */
296 
        "xchgl %%eax,%%esi\n\t"
297 
        "incl %%esi\n\t"
298 
        "cmpb $0,-1(%%eax)\n\t"
299 
        "jne 1b\n\t"
300 
        "xorl %%eax,%%eax\n\t"
301 
        "2:"
302 
        :"=a" (__res):"0" (0),"c" (0xffffffff),"S" (cs),"g" (ct)
303 
        :"cx","dx","di","si");
304 
return __res;
305 
}
306 
 
307 
#define __HAVE_ARCH_STRLEN
308 
extern inline size_t strlen(const char * s)
309 
{
310 
/*
311 
 * slightly slower on a 486, but with better chances of
312 
 * register allocation
313 
 */
314 
register char dummy, *tmp= (char *)s;
315 
__asm__ __volatile__(
316 
        "\n1:\t"
317 
        "movb\t(%0),%1\n\t"
318 
        "incl\t%0\n\t"
319 
        "testb\t%1,%1\n\t"
320 
        "jne\t1b"
321 
        :"=r" (tmp),"=q" (dummy)
322 
        :"0" (s)
323 
        : "memory" );
324 
return (tmp-s-1);
325 
}
326 
 
327 
/* Added by Gertjan van Wingerde to make minix and sysv module work */
328 
#define __HAVE_ARCH_STRNLEN
329 
extern inline size_t strnlen(const char * s, size_t count)
330 
{
331 
register int __res;
332 
__asm__ __volatile__(
333 
        "movl %1,%0\n\t"
334 
        "jmp 2f\n"
335 
        "1:\tcmpb $0,(%0)\n\t"
336 
        "je 3f\n\t"
337 
        "incl %0\n"
338 
        "2:\tdecl %2\n\t"
339 
        "cmpl $-1,%2\n\t"
340 
        "jne 1b\n"
341 
        "3:\tsubl %1,%0"
342 
        :"=a" (__res)
343 
        :"c" (s),"d" (count)
344 
        :"dx");
345 
return __res;
346 
}
347 
/* end of additional stuff */
348 
 
349 
#define __HAVE_ARCH_STRTOK
350 
extern inline char * strtok(char * s,const char * ct)
351 
{
352 
register char * __res;
353 
__asm__ __volatile__(
354 
        "testl %1,%1\n\t"
355 
        "jne 1f\n\t"
356 
        "testl %0,%0\n\t"
357 
        "je 8f\n\t"
358 
        "movl %0,%1\n"
359 
        "1:\txorl %0,%0\n\t"
360 
        "movl $-1,%%ecx\n\t"
361 
        "xorl %%eax,%%eax\n\t"
362 
        "cld\n\t"
363 
        "movl %4,%%edi\n\t"
364 
        "repne\n\t"
365 
        "scasb\n\t"
366 
        "notl %%ecx\n\t"
367 
        "decl %%ecx\n\t"
368 
        "je 7f\n\t"                     /* empty delimiter-string */
369 
        "movl %%ecx,%%edx\n"
370 
        "2:\tlodsb\n\t"
371 
        "testb %%al,%%al\n\t"
372 
        "je 7f\n\t"
373 
        "movl %4,%%edi\n\t"
374 
        "movl %%edx,%%ecx\n\t"
375 
        "repne\n\t"
376 
        "scasb\n\t"
377 
        "je 2b\n\t"
378 
        "decl %1\n\t"
379 
        "cmpb $0,(%1)\n\t"
380 
        "je 7f\n\t"
381 
        "movl %1,%0\n"
382 
        "3:\tlodsb\n\t"
383 
        "testb %%al,%%al\n\t"
384 
        "je 5f\n\t"
385 
        "movl %4,%%edi\n\t"
386 
        "movl %%edx,%%ecx\n\t"
387 
        "repne\n\t"
388 
        "scasb\n\t"
389 
        "jne 3b\n\t"
390 
        "decl %1\n\t"
391 
        "cmpb $0,(%1)\n\t"
392 
        "je 5f\n\t"
393 
        "movb $0,(%1)\n\t"
394 
        "incl %1\n\t"
395 
        "jmp 6f\n"
396 
        "5:\txorl %1,%1\n"
397 
        "6:\tcmpb $0,(%0)\n\t"
398 
        "jne 7f\n\t"
399 
        "xorl %0,%0\n"
400 
        "7:\ttestl %0,%0\n\t"
401 
        "jne 8f\n\t"
402 
        "movl %0,%1\n"
403 
        "8:"
404 
        :"=b" (__res),"=S" (___strtok)
405 
        :"0" (___strtok),"1" (s),"g" (ct)
406 
        :"ax","cx","dx","di","memory");
407 
return __res;
408 
}
409 
 
410 
#define __memcpy_c(d,s,count) \
411 
((count%4==0) ? \
412 
 __memcpy_by4((d),(s),(count)) : \
413 
 ((count%2==0) ? \
414 
  __memcpy_by2((d),(s),(count)) : \
415 
  __memcpy_g((d),(s),(count))))
416 
 
417 
#define __HAVE_ARCH_MEMCPY
418 
#define memcpy(d,s,count) \
419 
(count == 0 \
420 
 ? d \
421 
 : __builtin_constant_p(count) \
422 
   ? __memcpy_c((d),(s),(count)) \
423 
   : __memcpy_g((d),(s),(count)))
424 
 
425 
/*
426 
 *      These ought to get tweaked to do some cache priming.
427 
 */
428 
 
429 
extern inline void * __memcpy_by4(void * to, const void * from, size_t n)
430 
{
431 
register void *tmp = (void *)to;
432 
register int dummy1,dummy2;
433 
__asm__ __volatile__ (
434 
        "\n1:\tmovl (%2),%0\n\t"
435 
        "addl $4,%2\n\t"
436 
        "movl %0,(%1)\n\t"
437 
        "addl $4,%1\n\t"
438 
        "decl %3\n\t"
439 
        "jnz 1b"
440 
        :"=r" (dummy1), "=r" (tmp), "=r" (from), "=r" (dummy2)
441 
        :"1" (tmp), "2" (from), "3" (n/4)
442 
        :"memory");
443 
return to;
444 
}
445 
 
446 
extern inline void * __memcpy_by2(void * to, const void * from, size_t n)
447 
{
448 
register void *tmp = (void *)to;
449 
register int dummy1,dummy2;
450 
__asm__ __volatile__ (
451 
        "shrl $1,%3\n\t"
452 
        "jz 2f\n"                 /* only a word */
453 
        "1:\tmovl (%2),%0\n\t"
454 
        "addl $4,%2\n\t"
455 
        "movl %0,(%1)\n\t"
456 
        "addl $4,%1\n\t"
457 
        "decl %3\n\t"
458 
        "jnz 1b\n"
459 
        "2:\tmovw (%2),%w0\n\t"
460 
        "movw %w0,(%1)"
461 
        :"=r" (dummy1), "=r" (tmp), "=r" (from), "=r" (dummy2)
462 
        :"1" (tmp), "2" (from), "3" (n/2)
463 
        :"memory");
464 
return to;
465 
}
466 
 
467 
extern inline void * __memcpy_g(void * to, const void * from, size_t n)
468 
{
469 
register void *tmp = (void *)to;
470 
__asm__ __volatile__ (
471 
        "cld\n\t"
472 
        "shrl $1,%%ecx\n\t"
473 
        "jnc 1f\n\t"
474 
        "movsb\n"
475 
        "1:\tshrl $1,%%ecx\n\t"
476 
        "jnc 2f\n\t"
477 
        "movsw\n"
478 
        "2:\trep\n\t"
479 
        "movsl"
480 
        : /* no output */
481 
        :"c" (n),"D" ((long) tmp),"S" ((long) from)
482 
        :"cx","di","si","memory");
483 
return to;
484 
}
485 
 
486 
 
487 
#define __HAVE_ARCH_MEMMOVE
488 
extern inline void * memmove(void * dest,const void * src, size_t n)
489 
{
490 
register void *tmp = (void *)dest;
491 
if (dest<src)
492 
__asm__ __volatile__ (
493 
        "cld\n\t"
494 
        "rep\n\t"
495 
        "movsb"
496 
        : /* no output */
497 
        :"c" (n),"S" (src),"D" (tmp)
498 
        :"cx","si","di");
499 
else
500 
__asm__ __volatile__ (
501 
        "std\n\t"
502 
        "rep\n\t"
503 
        "movsb\n\t"
504 
        "cld\n\t"
505 
        : /* no output */
506 
        :"c" (n), "S" (n-1+(const char *)src), "D" (n-1+(char *)tmp)
507 
        :"cx","si","di","memory");
508 
return dest;
509 
}
510 
 
511 
extern inline int memcmp(const void * cs,const void * ct,size_t count)
512 
{
513 
register int __res;
514 
__asm__ __volatile__(
515 
        "cld\n\t"
516 
        "repe\n\t"
517 
        "cmpsb\n\t"
518 
        "je 1f\n\t"
519 
        "sbbl %0,%0\n\t"
520 
        "orb $1,%b0\n"
521 
        "1:"
522 
        :"=abd" (__res):"0" (0),"S" (cs),"D" (ct),"c" (count)
523 
        :"si","di","cx");
524 
return __res;
525 
}
526 
 
527 
#define __HAVE_ARCH_MEMCHR
528 
extern inline void * memchr(const void * cs,int c,size_t count)
529 
{
530 
register void * __res;
531 
if (!count)
532 
        return NULL;
533 
__asm__ __volatile__(
534 
        "cld\n\t"
535 
        "repne\n\t"
536 
        "scasb\n\t"
537 
        "je 1f\n\t"
538 
        "movl $1,%0\n"
539 
        "1:\tdecl %0"
540 
        :"=D" (__res):"a" (c),"D" (cs),"c" (count)
541 
        :"cx");
542 
return __res;
543 
}
544 
 
545 
#define __memset_cc(s,c,count) \
546 
((count%4==0) ? \
547 
 __memset_cc_by4((s),(c),(count)) : \
548 
 ((count%2==0) ? \
549 
  __memset_cc_by2((s),(c),(count)) : \
550 
  __memset_cg((s),(c),(count))))
551 
 
552 
#define __memset_gc(s,c,count) \
553 
((count%4==0) ? \
554 
 __memset_gc_by4((s),(c),(count)) : \
555 
 ((count%2==0) ? \
556 
  __memset_gc_by2((s),(c),(count)) : \
557 
  __memset_gg((s),(c),(count))))
558 
 
559 
#define __HAVE_ARCH_MEMSET
560 
#define memset(s,c,count) \
561 
(count == 0 \
562 
 ? s \
563 
 : __builtin_constant_p(c) \
564 
   ? __builtin_constant_p(count) \
565 
     ? __memset_cc((s),(c),(count)) \
566 
     : __memset_cg((s),(c),(count)) \
567 
   : __builtin_constant_p(count) \
568 
     ? __memset_gc((s),(c),(count)) \
569 
     : __memset_gg((s),(c),(count)))
570 
 
571 
extern inline void * __memset_cc_by4(void * s, char c, size_t count)
572 
{
573 
/*
574 
 * register char *tmp = s;
575 
 */
576 
register char *tmp = (char *)s;
577 
register int  dummy;
578 
__asm__ __volatile__ (
579 
        "\n1:\tmovl %2,(%0)\n\t"
580 
        "addl $4,%0\n\t"
581 
        "decl %1\n\t"
582 
        "jnz 1b"
583 
        :"=r" (tmp), "=r" (dummy)
584 
        :"r" (0x01010101UL * (unsigned char) c), "0" (tmp), "1" (count/4)
585 
        :"memory");
586 
return s;
587 
}
588 
 
589 
extern inline void * __memset_cc_by2(void * s, char c, size_t count)
590 
{
591 
register void *tmp = (void *)s;
592 
register int  dummy;
593 
__asm__ __volatile__ (
594 
        "shrl $1,%1\n\t"          /* may be divisible also by 4 */
595 
        "jz 2f\n"
596 
        "\n1:\tmovl %2,(%0)\n\t"
597 
        "addl $4,%0\n\t"
598 
        "decl %1\n\t"
599 
        "jnz 1b\n"
600 
        "2:\tmovw %w2,(%0)"
601 
        :"=r" (tmp), "=r" (dummy)
602 
        :"r" (0x01010101UL * (unsigned char) c), "0" (tmp), "1" (count/2)
603 
        :"memory");
604 
return s;
605 
}
606 
 
607 
extern inline void * __memset_gc_by4(void * s, char c, size_t count)
608 
{
609 
register void *tmp = (void *)s;
610 
register int dummy;
611 
__asm__ __volatile__ (
612 
        "movb %b0,%h0\n"
613 
        "pushw %w0\n\t"
614 
        "shll $16,%k0\n\t"
615 
        "popw %w0\n"
616 
        "1:\tmovl %k0,(%1)\n\t"
617 
        "addl $4,%1\n\t"
618 
        "decl %2\n\t"
619 
        "jnz 1b\n"
620 
        :"=q" (c), "=r" (tmp), "=r" (dummy)
621 
        :"0" ((unsigned) c),  "1"  (tmp), "2" (count/4)
622 
        :"memory");
623 
return s;
624 
}
625 
 
626 
extern inline void * __memset_gc_by2(void * s, char c, size_t count)
627 
{
628 
register void *tmp = (void *)s;
629 
register int dummy1,dummy2;
630 
__asm__ __volatile__ (
631 
        "movb %b0,%h0\n\t"
632 
        "shrl $1,%2\n\t"          /* may be divisible also by 4 */
633 
        "jz 2f\n\t"
634 
        "pushw %w0\n\t"
635 
        "shll $16,%k0\n\t"
636 
        "popw %w0\n"
637 
        "1:\tmovl %k0,(%1)\n\t"
638 
        "addl $4,%1\n\t"
639 
        "decl %2\n\t"
640 
        "jnz 1b\n"
641 
        "2:\tmovw %w0,(%1)"
642 
        :"=q" (dummy1), "=r" (tmp), "=r" (dummy2)
643 
        :"0" ((unsigned) c),  "1"  (tmp), "2" (count/2)
644 
        :"memory");
645 
return s;
646 
}
647 
 
648 
extern inline void * __memset_cg(void * s, char c, size_t count)
649 
{
650 
register void *tmp = (void *)s;
651 
__asm__ __volatile__ (
652 
        "shrl $1,%%ecx\n\t"
653 
        "cld\n\t"
654 
        "rep\n\t"
655 
        "stosw\n\t"
656 
        "jnc 1f\n\t"
657 
        "movb %%al,(%%edi)\n"
658 
        "1:"
659 
        : /* no output */
660 
        :"c" (count),"D" (tmp), "a" (0x0101U * (unsigned char) c)
661 
        :"cx","di","memory");
662 
return s;
663 
}
664 
 
665 
extern inline void * __memset_gg(void * s,char c,size_t count)
666 
{
667 
register void *tmp = (void *)s;
668 
__asm__ __volatile__ (
669 
        "movb %%al,%%ah\n\t"
670 
        "shrl $1,%%ecx\n\t"
671 
        "cld\n\t"
672 
        "rep\n\t"
673 
        "stosw\n\t"
674 
        "jnc 1f\n\t"
675 
        "movb %%al,(%%edi)\n"
676 
        "1:"
677 
        : /* no output */
678 
        :"c" (count),"D" (tmp), "a" (c)
679 
        :"cx","di","memory");
680 
return s;
681 
}
682 
 
683 
 
684 
/*
685 
 * find the first occurrence of byte 'c', or 1 past the area if none
686 
 */
687 
#define __HAVE_ARCH_MEMSCAN
688 
extern inline void * memscan(void * addr, int c, size_t size)
689 
{
690 
        if (!size)
691 
                return addr;
692 
        __asm__("cld
693 
                repnz; scasb
694 
                jnz 1f
695 
                dec %%edi
696 
1:              "
697 
                : "=D" (addr), "=c" (size)
698 
                : "0" (addr), "1" (size), "a" (c));
699 
        return addr;
700 
}
701 
 
702 
#endif

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