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| Source at commit 1308 created 12 years 8 months ago. By meklort, Add a few placeholders for file io | |
|---|---|
| 1 | /*␊ |
| 2 | * memcpy.c␊ |
| 3 | */␊ |
| 4 | ␊ |
| 5 | #include <string.h>␊ |
| 6 | #include <stdint.h>␊ |
| 7 | ␊ |
| 8 | void *memcpy(void *dst, const void *src, size_t n)␊ |
| 9 | {␊ |
| 10 | ␉const char *p = src;␊ |
| 11 | ␉char *q = dst;␊ |
| 12 | #if defined(__i386__)␊ |
| 13 | ␉size_t nl = n >> 2;␊ |
| 14 | ␉asm volatile ("cld ; rep ; movsl ; movl %3,%0 ; rep ; movsb":"+c" (nl),␊ |
| 15 | ␉␉ "+S"(p), "+D"(q)␊ |
| 16 | ␉␉ :"r"(n & 3));␊ |
| 17 | #elif defined(__x86_64__)␊ |
| 18 | ␉size_t nq = n >> 3;␊ |
| 19 | ␉asm volatile ("cld ; rep ; movsq ; movl %3,%%ecx ; rep ; movsb":"+c"␊ |
| 20 | ␉␉ (nq), "+S"(p), "+D"(q)␊ |
| 21 | ␉␉ :"r"((uint32_t) (n & 7)));␊ |
| 22 | #else␊ |
| 23 | ␉while (n--) {␊ |
| 24 | ␉␉*q++ = *p++;␊ |
| 25 | ␉}␊ |
| 26 | #endif␊ |
| 27 | ␊ |
| 28 | ␉return dst;␊ |
| 29 | }␊ |
| 30 | |
