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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 | d8bf4388df679fa5a3ae7889a649e573e3124530 (patch) | |
| tree | 7b01570762e0eb49acf862483736b26a2d6a9c14 /malloc/alloc_buffer_alloc_array.c | |
| parent | 29c577e0f54fe6e70ceacb3659179781c5569903 (diff) | |
| download | glibc-d8bf4388df679fa5a3ae7889a649e573e3124530.tar.xz glibc-d8bf4388df679fa5a3ae7889a649e573e3124530.zip | |
x86-64: Require BMI2 for AVX2 wcs(n)cmp implementations
The AVX2 wcs(n)cmp implementations use 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 f31a5a884ed84bd37032729d4d1eb9d06c9f3c29)
Diffstat (limited to 'malloc/alloc_buffer_alloc_array.c')
0 files changed, 0 insertions, 0 deletions