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| author | Aurelien Jarno <aurelien@aurel32.net> | 2022-10-03 23:46:11 +0200 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2022-10-03 23:47:49 +0200 |
| commit | 29c577e0f54fe6e70ceacb3659179781c5569903 (patch) | |
| tree | f3af2d0debf6f5d50fe1374f9a6c9d6f45c6d5cf /malloc/alloc_buffer_alloc_array.c | |
| parent | 7afbd1e56acb721031bffd876f275dcb1af7e530 (diff) | |
| download | glibc-29c577e0f54fe6e70ceacb3659179781c5569903.tar.xz glibc-29c577e0f54fe6e70ceacb3659179781c5569903.zip | |
x86-64: Require BMI2 for AVX2 strncmp implementation
The AVX2 strncmp implementations uses the 'bzhi' instruction, which
belongs to the BMI2 CPU feature.
NB: It also uses the 'tzcnt' BMI1 instruction, but it is executed as BSF
as BSF if the CPU doesn't support TZCNT, and produces the same result
for non-zero input.
Partially fixes: b77b06e0e296 ("x86: Optimize strcmp-avx2.S")
Partially resolves: BZ #29611
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit fc7de1d9b99ae1676bc626ddca422d7abee0eb48)
Diffstat (limited to 'malloc/alloc_buffer_alloc_array.c')
0 files changed, 0 insertions, 0 deletions