From: H. Peter Anvin <hpa@zytor.com>
Date: Mon, 25 Feb 2008 23:25:29 +0000 (-0800)
Subject: gptmbr: use xchgw %ax,... instead of movw %ax,... when %ax is dead
X-Git-Tag: syslinux-3.64-pre1~1^2~5
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=45ba7656f6bf6b46ed9e82fd257340b023f6d457;p=profile%2Fivi%2Fsyslinux.git

gptmbr: use xchgw %ax,... instead of movw %ax,... when %ax is dead

xhcgw with %ax and a register is one byte shorter than movw with %ax
if %ax is then dead.
---

diff --git a/mbr/gptmbr.S b/mbr/gptmbr.S
index 20a46a2..8bc5e41 100644
--- a/mbr/gptmbr.S
+++ b/mbr/gptmbr.S
@@ -161,7 +161,7 @@ find_part:
 	.ascii	"Boot partition not found\r\n"
 
 found_part:
-	movw	%ax,%cx		/* Set up %cx for rep movsb further down */
+	xchgw	%ax,%cx		/* Set up %cx for rep movsb further down */
 	
 	movw	$dssi_out,%di
 	pushw	%di