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Commit 1a20d3ec authored by H. Peter Anvin's avatar H. Peter Anvin
Browse files

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: default avatarH. Peter Anvin <hpa@zytor.com>
parent 4b6011bc

include/asm-x86/string_32.h

+8 −1
Original line number Diff line number Diff line
@@ -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("");