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gallium/util: Don't use __builtin_clrsb in util_last_bit(). 

Unclear circumstances lead to undefined symbols on x86.

Bugzilla: https://bugs.gentoo.org/show_bug.cgi?id=536916
Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
This commit is contained in:
Matt Turner 2015-02-02 17:26:49 -08:00
parent d8be1b9aba
commit 32e98e8ef0
1 changed files with 0 additions and 4 deletions
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4
src/gallium/auxiliary/util/u_math.h
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@ -561,14 +561,10 @@ util_last_bit(unsigned u)
static INLINE unsigned
util_last_bit_signed(int i)
{
#if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 407) && !defined(__INTEL_COMPILER)
return 31 - __builtin_clrsb(i);
#else
if (i >= 0)
return util_last_bit(i);
else
return util_last_bit(~(unsigned)i);
#endif
}
/* Destructively loop over all of the bits in a mask as in: