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| author | Sunil K Pandey <skpgkp2@gmail.com> | 2022-08-09 07:57:29 -0700 |
|---|---|---|
| committer | Sunil K Pandey <skpgkp2@gmail.com> | 2022-11-03 15:51:52 -0700 |
| commit | faaf733f49211439475e50f06716b303ee2644bf (patch) | |
| tree | 3dd19a3b1d40d31f72cb063a05ad86dc273555d8 /sysdeps/x86_64/multiarch/ifunc-impl-list.c | |
| parent | 1f34a2328890aa192141f96449d25b77f666bf47 (diff) | |
| download | glibc-faaf733f49211439475e50f06716b303ee2644bf.tar.gz glibc-faaf733f49211439475e50f06716b303ee2644bf.tar.xz glibc-faaf733f49211439475e50f06716b303ee2644bf.zip | |
x86_64: Implement evex512 version of strrchr and wcsrchr
Changes from v1: Use vec api for register. Replace VPCMP with VPCMPEQ Restructure and remove 1 unconditional jump. Change page cross logic to use sall. This patch implements following evex512 version of string functions. evex512 version takes up to 30% less cycle as compared to evex, depending on length and alignment. - strrchr function using 512 bit vectors. - wcsrchr function using 512 bit vectors. Code size data: strrchr-evex.o 879 byte strrchr-evex512.o 601 byte (-32%) wcsrchr-evex.o 882 byte wcsrchr-evex512.o 572 byte (-35%) Placeholder function, not used by any processor at the moment. Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
Diffstat (limited to 'sysdeps/x86_64/multiarch/ifunc-impl-list.c')
| -rw-r--r-- | sysdeps/x86_64/multiarch/ifunc-impl-list.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c index c3d75a09f4..7cebee7ec7 100644 --- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c +++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c @@ -600,6 +600,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, && CPU_FEATURE_USABLE (BMI1) && CPU_FEATURE_USABLE (BMI2)), __strrchr_evex) + X86_IFUNC_IMPL_ADD_V4 (array, i, strrchr, + (CPU_FEATURE_USABLE (AVX512VL) + && CPU_FEATURE_USABLE (AVX512BW) + && CPU_FEATURE_USABLE (BMI2)), + __strrchr_evex512) X86_IFUNC_IMPL_ADD_V3 (array, i, strrchr, (CPU_FEATURE_USABLE (AVX2) && CPU_FEATURE_USABLE (BMI1) @@ -828,6 +833,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, && CPU_FEATURE_USABLE (BMI1) && CPU_FEATURE_USABLE (BMI2)), __wcsrchr_evex) + X86_IFUNC_IMPL_ADD_V4 (array, i, wcsrchr, + (CPU_FEATURE_USABLE (AVX512VL) + && CPU_FEATURE_USABLE (AVX512BW) + && CPU_FEATURE_USABLE (BMI2)), + __wcsrchr_evex512) X86_IFUNC_IMPL_ADD_V3 (array, i, wcsrchr, (CPU_FEATURE_USABLE (AVX2) && CPU_FEATURE_USABLE (BMI1) |