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author | Aurelien Jarno <aurelien@aurel32.net> | 2022-10-03 23:46:11 +0200 |
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committer | Aurelien Jarno <aurelien@aurel32.net> | 2022-10-03 23:46:11 +0200 |
commit | 10f79d3670b036925da63dc532b122d27ce65ff8 (patch) | |
tree | d75602ba126717f5ba747f1a6e9d4ed31338d891 /sysdeps/x86_64/memcmp-isa-default-impl.h | |
parent | b80f16adbd979831bf25ea491e1261e81885c2b6 (diff) | |
download | glibc-10f79d3670b036925da63dc532b122d27ce65ff8.tar.gz glibc-10f79d3670b036925da63dc532b122d27ce65ff8.tar.xz glibc-10f79d3670b036925da63dc532b122d27ce65ff8.zip |
x86-64: Require BMI2 for AVX2 str(n)casecmp implementations
The AVX2 str(n)casecmp 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>
Diffstat (limited to 'sysdeps/x86_64/memcmp-isa-default-impl.h')
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