x86: string_32.h: workaround for broken gcc 4.0
gcc 4.0 fails to allocate %eax for the pattern operand in the rep
store instructions used by memset; force it to do so by declaring a
register variable.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/include/asm-x86/string_32.h b/include/asm-x86/string_32.h
index 8d0c593..193578c 100644
--- a/include/asm-x86/string_32.h
+++ b/include/asm-x86/string_32.h
@@ -267,11 +267,18 @@
asm volatile("rep ; stosl" \
x \
: "=&c" (d0), "=&D" (d1) \
- : "a" (pattern), "0" (count/4), "1" ((long)s) \
+ : "a" (eax), "0" (count/4), "1" ((long)s) \
: "memory")
{
int d0, d1;
+#if __GNUC__ == 4 && __GNUC_MINOR__ == 0
+ /* Workaround for broken gcc 4.0 */
+ register unsigned long eax asm("%eax") = pattern;
+#else
+ unsigned long eax = pattern;
+#endif
+
switch (count % 4) {
case 0:
COMMON("");