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mn10300: add cc clobbers to asm statements

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gcc 4.2.1 for MN10300 is more agressive than the older gcc in
reordering/moving other insns between an insn that sets flags and an insn
that uses those flags.  This leads to trouble with asm statements which
are missing an explicit "cc" clobber.  This patch adds the explicit "cc"
clobber to asm statements which do indeed clobber the condition flags.

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mark Salter
2010-01-08 14:43:16 -08:00
committed by Linus Torvalds
parent b0641e86fb
commit d6bb7a1ad3
10 changed files with 18 additions and 12 deletions
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4
arch/mn10300/include/asm/bitops.h
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@@ -165,7 +165,7 @@ static inline __attribute__((const))
unsigned long __ffs(unsigned long x)
{
int bit;
asm("bsch %2,%0" : "=r"(bit) : "0"(0), "r"(x & -x));
asm("bsch %2,%0" : "=r"(bit) : "0"(0), "r"(x & -x) : "cc");
return bit;
}
@@ -177,7 +177,7 @@ static inline __attribute__((const))
int __ilog2_u32(u32 n)
{
int bit;
asm("bsch %2,%0" : "=r"(bit) : "0"(0), "r"(n));
asm("bsch %2,%0" : "=r"(bit) : "0"(0), "r"(n) : "cc");
return bit;
}