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| Source at commit 1247 created 12 years 8 months ago. By meklort, Update makefiles... initial work for fat modules | |
|---|---|
| 1 | /*␊ |
| 2 | * memmove.c␊ |
| 3 | */␊ |
| 4 | #include <sys/types.h>␊ |
| 5 | ␊ |
| 6 | void *memmove(void *dst, const void *src, size_t n)␊ |
| 7 | {␊ |
| 8 | ␉const char *p = src;␊ |
| 9 | ␉char *q = dst;␊ |
| 10 | #if defined(__i386__) || defined(__x86_64__)␊ |
| 11 | ␉if (q < p) {␊ |
| 12 | ␉␉asm volatile("cld; rep; movsb"␊ |
| 13 | ␉␉␉ : "+c" (n), "+S"(p), "+D"(q));␊ |
| 14 | ␉} else {␊ |
| 15 | ␉␉p += (n - 1);␊ |
| 16 | ␉␉q += (n - 1);␊ |
| 17 | ␉␉asm volatile("std; rep; movsb; cld"␊ |
| 18 | ␉␉␉ : "+c" (n), "+S"(p), "+D"(q));␊ |
| 19 | ␉}␊ |
| 20 | #else␊ |
| 21 | ␉if (q < p) {␊ |
| 22 | ␉␉while (n--) {␊ |
| 23 | ␉␉␉*q++ = *p++;␊ |
| 24 | ␉␉}␊ |
| 25 | ␉} else {␊ |
| 26 | ␉␉p += n;␊ |
| 27 | ␉␉q += n;␊ |
| 28 | ␉␉while (n--) {␊ |
| 29 | ␉␉␉*--q = *--p;␊ |
| 30 | ␉␉}␊ |
| 31 | ␉}␊ |
| 32 | #endif␊ |
| 33 | ␊ |
| 34 | ␉return dst;␊ |
| 35 | }␊ |
| 36 | |
