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(parent: e3e7fab) | 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 21:46:11 +0000 (23:46 +0200)
commit3c0c78afabfed4b6fc161c159e628fbf14ff370b
treec8dafc90670cbdc7cf4061477cee1671f31f6476tree | snapshot
parente3e7fab7fe5186d18ca2046d99ba321c27db30adcommit | 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>
sysdeps/x86/isa-level.h diff | blob | history
sysdeps/x86_64/multiarch/ifunc-avx2.h diff | blob | history
sysdeps/x86_64/multiarch/ifunc-impl-list.c diff | blob | history
Domain: System / Toolchain;