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vppinfra: add clear_lowest_set_bit() function, use BMI2 if available
[vpp.git]
/
src
/
vppinfra
/
clib.h
diff --git
a/src/vppinfra/clib.h
b/src/vppinfra/clib.h
index
22377c6
..
05af8fe
100644
(file)
--- a/
src/vppinfra/clib.h
+++ b/
src/vppinfra/clib.h
@@
-158,6
+158,16
@@
#endif
#if defined (count_leading_zeros)
+always_inline uword
+clear_lowest_set_bit (uword x)
+{
+#ifdef __BMI2__
+ return _blsr_u64 (x);
+#else
+ return x ^ (1ULL << count_trailing_zeros (x));
+#endif
+}
+
always_inline uword
min_log2 (uword x)
{