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vppinfra: use bzhi in pow2_mask when available
[vpp.git]
/
src
/
vppinfra
/
clib.h
diff --git
a/src/vppinfra/clib.h
b/src/vppinfra/clib.h
index
f0c3aca
..
81b59e2
100644
(file)
--- a/
src/vppinfra/clib.h
+++ b/
src/vppinfra/clib.h
@@
-251,6
+251,9
@@
min_log2_u64 (u64 x)
always_inline uword
pow2_mask (uword x)
{
+#ifdef __BMI2__
+ return _bzhi_u64 (-1ULL, x);
+#endif
return ((uword) 1 << x) - (uword) 1;
}