diff options
| 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/strcmp.c | |
| parent | 91264fe3577fe887b4860923fa6142b5274c8965 (diff) | |
| download | glibc-7ebba91361badf7531d4e75050627a88d424872f.tar.gz glibc-7ebba91361badf7531d4e75050627a88d424872f.tar.xz glibc-7ebba91361badf7531d4e75050627a88d424872f.zip | |
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/strcmp.c')
| -rw-r--r-- | sysdeps/x86_64/multiarch/strcmp.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/strcmp.c b/sysdeps/x86_64/multiarch/strcmp.c index 1df75690d0..62b7abeeee 100644 --- a/sysdeps/x86_64/multiarch/strcmp.c +++ b/sysdeps/x86_64/multiarch/strcmp.c @@ -30,6 +30,7 @@ extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden; extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned) attribute_hidden; extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden; extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden; +extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_rtm) attribute_hidden; extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden; static inline void * @@ -46,6 +47,9 @@ IFUNC_SELECTOR (void) && !CPU_FEATURES_ARCH_P (cpu_features, Prefer_AVX2_STRCMP)) return OPTIMIZE (evex); + if (CPU_FEATURE_USABLE_P (cpu_features, RTM)) + return OPTIMIZE (avx2_rtm); + if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER)) return OPTIMIZE (avx2); } |