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https://github.com/torvalds/linux
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Tip revision: fad01e866afdbe01a1f3ec06a39c3a8b9e197014 authored by Linus Torvalds on 02 June 2014, 02:12:24 UTC
Linux 3.15-rc8
Tip revision: fad01e8
string.c
#include "misc.h"
#include "../string.c"

/* misc.h might pull in string_32.h which has a macro for memcpy. undef that */
#undef memcpy

#ifdef CONFIG_X86_32
void *memcpy(void *dest, const void *src, size_t n)
{
	int d0, d1, d2;
	asm volatile(
		"rep ; movsl\n\t"
		"movl %4,%%ecx\n\t"
		"rep ; movsb\n\t"
		: "=&c" (d0), "=&D" (d1), "=&S" (d2)
		: "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src)
		: "memory");

	return dest;
}
#else
void *memcpy(void *dest, const void *src, size_t n)
{
	long d0, d1, d2;
	asm volatile(
		"rep ; movsq\n\t"
		"movq %4,%%rcx\n\t"
		"rep ; movsb\n\t"
		: "=&c" (d0), "=&D" (d1), "=&S" (d2)
		: "0" (n >> 3), "g" (n & 7), "1" (dest), "2" (src)
		: "memory");

	return dest;
}
#endif

void *memset(void *s, int c, size_t n)
{
	int i;
	char *ss = s;

	for (i = 0; i < n; i++)
		ss[i] = c;
	return s;
}
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