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| author | H.J. Lu <hjl.tools@gmail.com> | 2021-10-29 12:56:53 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2021-11-01 07:53:04 -0700 |
| commit | 14dbbf46a007ae5df36646b51ad0c9e5f5259f30 (patch) | |
| tree | 7e0470499bd6cea64b76b1f0392bf23aeea2a19e /sysdeps/x86/cpu-features.c | |
| parent | c46e9afb2df5fc9e39ff4d13777e4b4c26e04e55 (diff) | |
| download | glibc-14dbbf46a007ae5df36646b51ad0c9e5f5259f30.tar.gz glibc-14dbbf46a007ae5df36646b51ad0c9e5f5259f30.tar.xz glibc-14dbbf46a007ae5df36646b51ad0c9e5f5259f30.zip | |
x86-64: Remove Prefer_AVX2_STRCMP
Remove Prefer_AVX2_STRCMP to enable EVEX strcmp. When comparing 2 32-byte strings, EVEX strcmp has been improved to require 1 load, 1 VPTESTM, 1 VPCMP, 1 KMOVD and 1 INCL instead of 2 loads, 3 VPCMPs, 2 KORDs, 1 KMOVD and 1 TESTL while AVX2 strcmp requires 1 load, 2 VPCMPEQs, 1 VPMINU, 1 VPMOVMSKB and 1 TESTL. EVEX strcmp is now faster than AVX2 strcmp by up to 40% on Tiger Lake and Ice Lake.
Diffstat (limited to 'sysdeps/x86/cpu-features.c')
| -rw-r--r-- | sysdeps/x86/cpu-features.c | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c index 645bba6314..be2498b2e7 100644 --- a/sysdeps/x86/cpu-features.c +++ b/sysdeps/x86/cpu-features.c @@ -546,14 +546,6 @@ init_cpu_features (struct cpu_features *cpu_features) if (CPU_FEATURE_USABLE_P (cpu_features, RTM)) cpu_features->preferred[index_arch_Prefer_No_VZEROUPPER] |= bit_arch_Prefer_No_VZEROUPPER; - - /* Since to compare 2 32-byte strings, 256-bit EVEX strcmp - requires 2 loads, 3 VPCMPs and 2 KORDs while AVX2 strcmp - requires 1 load, 2 VPCMPEQs, 1 VPMINU and 1 VPMOVMSKB, - AVX2 strcmp is faster than EVEX strcmp. */ - if (CPU_FEATURE_USABLE_P (cpu_features, AVX2)) - cpu_features->preferred[index_arch_Prefer_AVX2_STRCMP] - |= bit_arch_Prefer_AVX2_STRCMP; } /* Avoid avoid short distance REP MOVSB on processor with FSRM. */ |