From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Wed, 3 Jun 2015 07:28:05 +0000 (+0200)
Subject: x86/memcpy: reduce code size
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~3149
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=5e4a6f5473f86423f35425ee0e063398422f7af2;p=xen.git

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 <andrew.cooper3@citrix.com>
---

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)