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.
---
cpukit/score/include/rtems/score/prioritybitmapimpl.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/cpukit/score/include/rtems/score/prioritybitmapimpl.h
b/cpukit/score/include/rtems/score/prioritybitmapimpl.h
index 2041a20..0082720 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;
--
1.8.4.5
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