From c5852d4e301b4517c9cb1d4718eb9041b8b6c97b Mon Sep 17 00:00:00 2001
From: Xianyi Zhang <xianyi@iscas.ac.cn>
Date: Wed, 16 Feb 2011 23:39:43 +0800
Subject: [PATCH] fixed #4 csrot returned the wrong result when incx==incy==0.

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

diff --git a/kernel/x86_64/zrot_sse.S b/kernel/x86_64/zrot_sse.S
index 4aa0e7211..da79b4abe 100644
--- a/kernel/x86_64/zrot_sse.S
+++ b/kernel/x86_64/zrot_sse.S
@@ -1523,6 +1523,10 @@
 
 .L50:
 	movq	N,  %rax
+	cmpq	$0, INCX
+	je  .L56
+	cmpq	$0, INCY
+	je  .L56
 	sarq	$2, %rax
 	jle	.L55
 	ALIGN_3