fixed a bug in drot whe incx or incy equals to zero.

diff --git a/kernel/x86_64/rot_sse2.S b/kernel/x86_64/rot_sse2.S
index 5055547..5029403 100644 (file)
--- 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