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vppinfra: add clear_lowest_set_bit() function, use BMI2 if available
14/32114/1
author
Damjan Marion
<damarion@cisco.com>
Sun, 25 Apr 2021 08:58:07 +0000
(10:58 +0200)
committer
Damjan Marion
<damarion@cisco.com>
Sun, 25 Apr 2021 08:59:42 +0000
(10:59 +0200)
Type: improvement
Change-Id: I973cacd0cade0ca98e6261c1fb026a5eb38b44d3
Signed-off-by: Damjan Marion <damarion@cisco.com>
src/vppinfra/clib.h
patch
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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)
{