From 84ba64e65b53ad871b0cedbe5e1feeec4eebfdcc Mon Sep 17 00:00:00 2001
From: Xianyi Zhang <xianyi@iscas.ac.cn>
Date: Wed, 16 Feb 2011 00:18:45 +0800
Subject: [PATCH] fixed a bug in drot whe incx or incy equals to zero.

---
 kernel/x86_64/rot_sse2.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/x86_64/rot_sse2.S b/kernel/x86_64/rot_sse2.S
index 505554707..502940324 100644
--- a/kernel/x86_64/rot_sse2.S
+++ b/kernel/x86_64/rot_sse2.S
@@ -887,6 +887,10 @@
 
 .L50:
 	movq	N,  %rax
+	cmpq	$0, INCX
+	je  .L56
+	cmpq	$0, INCY
+	je  .L56
 	sarq	$2, %rax
 	jle	.L55
 	ALIGN_3