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| author | H.J. Lu <hjl.tools@gmail.com> | 2021-02-26 05:36:59 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2021-03-29 07:40:17 -0700 |
| commit | 1da50d4bda07f04135dca39f40e79fc9eabed1f8 (patch) | |
| tree | bf3a3ffac8850fffcb22dfb889374349f66136b1 /sysdeps/x86/include | |
| parent | 934d88d862627a0ded8955985b43f5f12aa38046 (diff) | |
| download | glibc-1da50d4bda07f04135dca39f40e79fc9eabed1f8.tar.gz glibc-1da50d4bda07f04135dca39f40e79fc9eabed1f8.tar.xz glibc-1da50d4bda07f04135dca39f40e79fc9eabed1f8.zip | |
x86: Set Prefer_No_VZEROUPPER and add Prefer_AVX2_STRCMP
1. Set Prefer_No_VZEROUPPER if RTM is usable to avoid RTM abort triggered by VZEROUPPER inside a transactionally executing RTM region. 2. 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. Add Prefer_AVX2_STRCMP to prefer AVX2 strcmp family functions.
Diffstat (limited to 'sysdeps/x86/include')
| -rw-r--r-- | sysdeps/x86/include/cpu-features-preferred_feature_index_1.def | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def b/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def index 06af1a8dd5..133aab19f1 100644 --- a/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def +++ b/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def @@ -32,3 +32,4 @@ BIT (Prefer_ERMS) BIT (Prefer_No_AVX512) BIT (MathVec_Prefer_No_AVX512) BIT (Prefer_FSRM) +BIT (Prefer_AVX2_STRCMP) |