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| author | H.J. Lu <hjl.tools@gmail.com> | 2021-03-05 07:26:42 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2021-03-29 07:40:17 -0700 |
| commit | 7ebba91361badf7531d4e75050627a88d424872f (patch) | |
| tree | d99781a37b47b95441ad358d119ec3741960d405 /sysdeps/x86_64/multiarch/ifunc-wmemset.h | |
| parent | 91264fe3577fe887b4860923fa6142b5274c8965 (diff) | |
| download | glibc-7ebba91361badf7531d4e75050627a88d424872f.zip glibc-7ebba91361badf7531d4e75050627a88d424872f.tar.gz glibc-7ebba91361badf7531d4e75050627a88d424872f.tar.bz2 | |
x86-64: Add AVX optimized string/memory functions for RTM
Since VZEROUPPER triggers RTM abort while VZEROALL won't, select AVX
optimized string/memory functions with
xtest
jz 1f
vzeroall
ret
1:
vzeroupper
ret
at function exit on processors with usable RTM, but without 256-bit EVEX
instructions to avoid VZEROUPPER inside a transactionally executing RTM
region.
Diffstat (limited to 'sysdeps/x86_64/multiarch/ifunc-wmemset.h')
| -rw-r--r-- | sysdeps/x86_64/multiarch/ifunc-wmemset.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/ifunc-wmemset.h b/sysdeps/x86_64/multiarch/ifunc-wmemset.h index 7e947c5..8d952ef 100644 --- a/sysdeps/x86_64/multiarch/ifunc-wmemset.h +++ b/sysdeps/x86_64/multiarch/ifunc-wmemset.h @@ -20,6 +20,8 @@ extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned) attribute_hidden; extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned) attribute_hidden; +extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned_rtm) + attribute_hidden; extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_unaligned) attribute_hidden; extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned) attribute_hidden; @@ -39,6 +41,9 @@ IFUNC_SELECTOR (void) if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)) return OPTIMIZE (evex_unaligned); + if (CPU_FEATURE_USABLE_P (cpu_features, RTM)) + return OPTIMIZE (avx2_unaligned_rtm); + if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER)) return OPTIMIZE (avx2_unaligned); } |