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Added memset optimized with AVX512 for KNL hardware.

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It shows improvement up to 28% over AVX2 memset (performance results
attached at <https://sourceware.org/ml/libc-alpha/2015-12/msg00052.html>).

    * sysdeps/x86_64/multiarch/memset-avx512-no-vzeroupper.S: New file.
    * sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Added new file.
    * sysdeps/x86_64/multiarch/ifunc-impl-list.c: Added new tests.
    * sysdeps/x86_64/multiarch/memset.S: Added new IFUNC branch.
    * sysdeps/x86_64/multiarch/memset_chk.S: Likewise.
    * sysdeps/x86/cpu-features.h (bit_Prefer_No_VZEROUPPER,
    index_Prefer_No_VZEROUPPER): New.
    * sysdeps/x86/cpu-features.c (init_cpu_features): Set the
    Prefer_No_VZEROUPPER for Knights Landing.
This commit is contained in:
Andrew Senkevich
2015-12-19 02:47:28 +03:00
parent 794950ed1d
commit 83d776f979
8 changed files with 244 additions and 4 deletions
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2
sysdeps/x86/cpu-features.c
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@@ -80,6 +80,8 @@ init_cpu_features (struct cpu_features *cpu_features)
case 0x57:
/* Knights Landing. Enable Silvermont optimizations. */
cpu_features->feature[index_Prefer_No_VZEROUPPER]
|= bit_Prefer_No_VZEROUPPER;
case 0x37:
case 0x4a: