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gallium/util: Use HAVE___BUILTIN_FFS* macros.

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Make use of the builtin ffs macros and split out ffsll
to a seperate block.  Needed for at least OpenBSD which
does not have ffsll in libc.

Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
This commit is contained in:
Jonathan Gray 2015-03-17 12:49:39 +11:00 • committed by Emil Velikov
parent 8cce7b05f1
commit 726d99b197
1 changed files with 16 additions and 2 deletions
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18
src/gallium/auxiliary/util/u_math.h
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@ -383,13 +383,27 @@ unsigned ffs( unsigned u )
return i;
}
#elif defined(__MINGW32__) || defined(PIPE_OS_ANDROID)
#elif defined(__MINGW32__) || defined(PIPE_OS_ANDROID) || \
defined(HAVE___BUILTIN_FFS)
#define ffs __builtin_ffs
#define ffsll __builtin_ffsll
#endif
#endif /* FFS_DEFINED */
/**
* Find first bit set in long long. Least significant bit is 1.
* Return 0 if no bits set.
*/
#ifndef FFSLL_DEFINED
#define FFSLL_DEFINED 1
#if defined(__MINGW32__) || defined(PIPE_OS_ANDROID) || \
defined(HAVE___BUILTIN_FFSLL)
#define ffsll __builtin_ffsll
#endif
#endif /* FFSLL_DEFINED */
/**
* Find last bit set in a word. The least significant bit is 1.
* Return 0 if no bits are set.