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x86: string_32.h: workaround for broken gcc 4.0

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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>
This commit is contained in:
H. Peter Anvin 2008-05-26 13:36:53 -07:00
parent 4b6011bc6e
commit 1a20d3ecf5
1 changed files with 8 additions and 1 deletions
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9
include/asm-x86/string_32.h
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@ -267,11 +267,18 @@ void *__constant_c_and_count_memset(void *s, unsigned long pattern,
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("");