|
Last change
on this file since dd1be7c was
e16e8f2,
checked in by Edwin Eefting <edwin@datux.nl>, 3 years ago
|
|
bootstuff
|
-
Property mode set to
100644
|
|
File size:
602 bytes
|
| Rev | Line | |
|---|
| [e16e8f2] | 1 | /* |
|---|
| 2 | * memset.c |
|---|
| 3 | */ |
|---|
| 4 | |
|---|
| 5 | #include <string.h> |
|---|
| 6 | #include <stdint.h> |
|---|
| 7 | |
|---|
| 8 | void *memset(void *dst, int c, size_t n) |
|---|
| 9 | { |
|---|
| 10 | char *q = dst; |
|---|
| 11 | |
|---|
| 12 | #if defined(__i386__) |
|---|
| 13 | size_t nl = n >> 2; |
|---|
| 14 | asm volatile ("cld ; rep ; stosl ; movl %3,%0 ; rep ; stosb" |
|---|
| 15 | : "+c" (nl), "+D" (q) |
|---|
| 16 | : "a" ((unsigned char)c * 0x01010101U), "r" (n & 3)); |
|---|
| 17 | #elif defined(__x86_64__) |
|---|
| 18 | size_t nq = n >> 3; |
|---|
| 19 | asm volatile ("cld ; rep ; stosq ; movl %3,%%ecx ; rep ; stosb" |
|---|
| 20 | :"+c" (nq), "+D" (q) |
|---|
| 21 | : "a" ((unsigned char)c * 0x0101010101010101U), |
|---|
| 22 | "r" ((uint32_t) n & 7)); |
|---|
| 23 | #else |
|---|
| 24 | while (n--) { |
|---|
| 25 | *q++ = c; |
|---|
| 26 | } |
|---|
| 27 | #endif |
|---|
| 28 | |
|---|
| 29 | return dst; |
|---|
| 30 | } |
|---|
Note: See
TracBrowser
for help on using the repository browser.
