| /* |
| * memset.c |
| */ |
| |
| #include <string.h> |
| |
| void *memset(void *dst, int c, size_t n) |
| { |
| char *q = dst; |
| |
| #if defined(__i386__) |
| size_t nl = n >> 2; |
| asm volatile("cld ; rep ; stosl ; movl %3,%0 ; rep ; stosb" |
| : "+c" (nl), "+D" (q) |
| : "a" ((unsigned char)c * 0x01010101U), "r" (n & 3)); |
| #elif defined(__x86_64__) |
| size_t nq = n >> 3; |
| asm volatile("cld ; rep ; stosq ; movl %3,%%ecx ; rep ; stosb" |
| : "+c" (nq), "+D" (q) |
| : "a" ((unsigned char)c * 0x0101010101010101U, |
| "r" ((uint32_t)n & 7)); |
| #else |
| while ( n-- ) { |
| *q++ = c; |
| } |
| #endif |
| |
| return dst; |
| } |