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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2016-06-08 08:52:38 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2016-06-08 15:48:03 +0200 |
| commit | 80bbb4eda36cf00e13fa49a206b88e80cf2acdc7 (patch) | |
| tree | a753f790c2142802b9959e3b808e3ffd838ceee8 | |
| parent | score: Inline _Bitfield_Find_first_bit() (diff) | |
| download | rtems-80bbb4eda36cf00e13fa49a206b88e80cf2acdc7.tar.bz2 | |
score: Use builtin for _Bitfield_Find_first_bit()
In case the CPU architecture provides no specialized
_CPU_Bitfield_Find_first_bit() macro, then use the __builtin_clz()
builtin in case __GNUC__ is defined.
| -rw-r--r-- | cpukit/score/include/rtems/score/prioritybitmapimpl.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/cpukit/score/include/rtems/score/prioritybitmapimpl.h b/cpukit/score/include/rtems/score/prioritybitmapimpl.h index 2041a2072d..0082720392 100644 --- a/cpukit/score/include/rtems/score/prioritybitmapimpl.h +++ b/cpukit/score/include/rtems/score/prioritybitmapimpl.h @@ -60,6 +60,8 @@ RTEMS_INLINE_ROUTINE unsigned int _Bitfield_Find_first_bit( #if ( CPU_USE_GENERIC_BITFIELD_CODE == FALSE ) _CPU_Bitfield_Find_first_bit( value, bit_number ); +#elif defined(__GNUC__) + bit_number = __builtin_clz( value ) - __SIZEOF_INT__ * __CHAR_BIT__ + 16; #else if ( value < 0x100 ) { bit_number = _Bitfield_Leading_zeros[ value ] + 8; |