Handle INCX=0,INCY=0 case

Fixes #1575 (sswap/dswap failing the swap utest on x86) as suggested by atsampson.

diff --git a/kernel/x86/swap.S b/kernel/x86/swap.S
index 54b00b3..d3cf049 100644 (file)
--- a/kernel/x86/swap.S
+++ b/kernel/x86/swap.S
@@ -138,6 +138,14 @@
 /* INCX != 1 or INCY != 1 */
 
 .L14:
+       cmpl    $0, %ebx
+       jne     .L141
+       cmpl    $0, %ecx
+       jne     .L141
+/* INCX == 0 and INCY == 0 */  
+       jmp     .L27
+
+.L141  
        movl    %edx, %eax
        sarl    $2,   %eax
        jle     .L28