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| author | Noah Goldstein <goldstein.w.n@gmail.com> | 2024-07-15 16:19:17 +0800 |
|---|---|---|
| committer | Noah Goldstein <goldstein.w.n@gmail.com> | 2024-07-16 17:20:18 +0800 |
| commit | 5bcf6265f215326d14dfacdce8532792c2c7f8f8 (patch) | |
| tree | 00b669b545dc16a3c6ed55148ef39830f0f55f65 /sysdeps/x86/include | |
| parent | 2dcc908538054377d19571d77a026b9f26d3fd0f (diff) | |
| download | glibc-5bcf6265f215326d14dfacdce8532792c2c7f8f8.tar.xz glibc-5bcf6265f215326d14dfacdce8532792c2c7f8f8.zip | |
x86: Disable non-temporal memset on Skylake Server
The original commit enabling non-temporal memset on Skylake Server had
erroneous benchmarks (actually done on ICX).
Further benchmarks indicate non-temporal stores may in fact by a
regression on Skylake Server.
This commit may be over-cautious in some cases, but should avoid any
regressions for 2.40.
Tested using qemu on all x86_64 cpu arch supported by both qemu +
GLIBC.
Reviewed-by: DJ Delorie <dj@redhat.com>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
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 85e7f54ec8..61bbbc2e89 100644 --- a/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def +++ b/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def @@ -33,3 +33,4 @@ BIT (Prefer_No_AVX512) BIT (MathVec_Prefer_No_AVX512) BIT (Prefer_FSRM) BIT (Avoid_Short_Distance_REP_MOVSB) +BIT (Avoid_Non_Temporal_Memset) |