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https://github.com/fail0verflow/switch-coreboot.git
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7c35af2bc3
This does not optimize memcpy for 64bit, it merely makes it compile. Change-Id: I69ad6bd0c3d5f617d9222643abf7a2ba7c2a0359 Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org> Signed-off-by: Scott Duplichan <scott@notabs.org> Reviewed-on: http://review.coreboot.org/10575 Tested-by: build bot (Jenkins) Reviewed-by: Marc Jones <marc.jones@se-eng.com>
22 lines
378 B
C
22 lines
378 B
C
#include <string.h>
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void *memcpy(void *dest, const void *src, size_t n)
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{
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unsigned long d0, d1, d2;
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asm volatile(
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#ifdef __x86_64__
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"rep ; movsd\n\t"
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"mov %4,%%rcx\n\t"
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#else
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"rep ; movsl\n\t"
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"movl %4,%%ecx\n\t"
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#endif
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"rep ; movsb\n\t"
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: "=&c" (d0), "=&D" (d1), "=&S" (d2)
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: "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src)
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: "memory"
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);
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return dest;
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}
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