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