From 5e4a6f5473f86423f35425ee0e063398422f7af2 Mon Sep 17 00:00:00 2001 From: Andrew Cooper Date: Wed, 3 Jun 2015 09:28:05 +0200 Subject: [PATCH] x86/memcpy: reduce code size 'n % BYTES_PER_LONG' is at most 7, and doesn't need a 64bit register mov. Signed-off-by: Andrew Cooper --- xen/arch/x86/string.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/arch/x86/string.c b/xen/arch/x86/string.c index 3af0ea8bec..043ae6615d 100644 --- a/xen/arch/x86/string.c +++ b/xen/arch/x86/string.c @@ -15,7 +15,7 @@ void *memcpy(void *dest, const void *src, size_t n) asm volatile ( " rep ; movs"__OS" ; " - " mov %4,%3 ; " + " mov %k4,%k3 ; " " rep ; movsb " : "=&c" (d0), "=&D" (d1), "=&S" (d2) : "0" (n/BYTES_PER_LONG), "r" (n%BYTES_PER_LONG), "1" (dest), "2" (src) -- 2.30.2