diff options
| author |   Damjan Marion <damarion@cisco.com> | 2021-10-27 17:31:46 +0200 |
|---|---|---|
| committer | Damjan Marion <damarion@cisco.com> | 2021-10-27 17:34:17 +0200 |
| commit | bd908d5ac9c3b8b54c5ddaf09cc356e5b4d0ee35 (patch) | |
| tree | afed0d32449df02bfeb1bd9ce9d085e3cf367cd6 | |
| parent | 2b9a4bf3b307870324715bab698204f286368cc0 (diff) | |
vppinfra: use bzhi in pow2_mask when available
Saves one clock....
Type: improvement
Change-Id: I43da40fb4887b77ac851f759c50a7ca2814f8f40
Signed-off-by: Damjan Marion <damarion@cisco.com>
| -rw-r--r-- | src/vppinfra/clib.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/vppinfra/clib.h b/src/vppinfra/clib.h index f0c3aca1e03..81b59e21a0b 100644 --- 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; } |