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