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(parent: d9196d4) | patch
x86-64: Require BMI2 and LZCNT for AVX2 memrchr implementation
authorAurelien Jarno <aurelien@aurel32.net>
Mon, 3 Oct 2022 21:46:11 +0000 (23:46 +0200)
committerAurelien Jarno <aurelien@aurel32.net>
Mon, 3 Oct 2022 21:47:50 +0000 (23:47 +0200)
commit923c3f3c373f499e62160e00831dda576443317b
tree34d55a604ebf0743a8811849d53ffac738265d34tree
parentd9196d4f3fa9997388655813ddd236426a16dd92commit | diff
x86-64: Require BMI2 and LZCNT for AVX2 memrchr implementation

The AVX2 memrchr implementation uses the 'shlxl' instruction, which
belongs to the BMI2 CPU feature and uses the 'lzcnt' instruction, which
belongs to the LZCNT CPU feature.

Fixes: af5306a735eb ("x86: Optimize memrchr-avx2.S")
Partially resolves: BZ #29611

Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit 3c0c78afabfed4b6fc161c159e628fbf14ff370b)
sysdeps/x86/isa-level.h diff | blob | blame | history
sysdeps/x86_64/multiarch/ifunc-avx2.h diff | blob | blame | history
sysdeps/x86_64/multiarch/ifunc-impl-list.c diff | blob | blame | history
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