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-rw-r--r--src/arch/x86/lib/memcpy.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/src/arch/x86/lib/memcpy.c b/src/arch/x86/lib/memcpy.c
index f8607cfc50..7f079ce9d6 100644
--- a/src/arch/x86/lib/memcpy.c
+++ b/src/arch/x86/lib/memcpy.c
@@ -5,11 +5,13 @@ void *memcpy(void *dest, const void *src, size_t n)
unsigned long d0, d1, d2;
asm volatile(
- "rep movsb"
- : "=S"(d0), "=D"(d1), "=c"(d2)
- : "0"(src), "1"(dest), "2"(n)
+ "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;
}