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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-06-09 05:42:16 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-06-09 05:42:29 -0700 |
| commit | 8fe57365bfb5a417d911ab715a5671b3b1d7b155 (patch) | |
| tree | 9b6a729305aaa4f9b30e8a016469fbbd5a7bc664 /sysdeps/x86_64/multiarch/ifunc-impl-list.c | |
| parent | dc485ceb2ac596d27294cc1942adf3181f15e8bf (diff) | |
| download | glibc-8fe57365bfb5a417d911ab715a5671b3b1d7b155.tar.gz glibc-8fe57365bfb5a417d911ab715a5671b3b1d7b155.tar.xz glibc-8fe57365bfb5a417d911ab715a5671b3b1d7b155.zip | |
x86-64: Optimize strchr/strchrnul/wcschr with AVX2
Optimize strchr/strchrnul/wcschr with AVX2 to search 32 bytes with vector instructions. It is as fast as SSE2 versions for size <= 16 bytes and up to 1X faster for or size > 16 bytes on Haswell. Select AVX2 version on AVX2 machines where vzeroupper is preferred and AVX unaligned load is fast. NB: It uses TZCNT instead of BSF since TZCNT produces the same result as BSF for non-zero input. TZCNT is faster than BSF and is executed as BSF if machine doesn't support TZCNT. * sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add strchr-sse2, strchrnul-sse2, strchr-avx2, strchrnul-avx2, wcschr-sse2 and wcschr-avx2. * sysdeps/x86_64/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Add tests for __strchr_avx2, __strchrnul_avx2, __strchrnul_sse2, __wcschr_avx2 and __wcschr_sse2. * sysdeps/x86_64/multiarch/strchr-avx2.S: New file. * sysdeps/x86_64/multiarch/strchr-sse2.S: Likewise. * sysdeps/x86_64/multiarch/strchr.c: Likewise. * sysdeps/x86_64/multiarch/strchrnul-avx2.S: Likewise. * sysdeps/x86_64/multiarch/strchrnul-sse2.S: Likewise. * sysdeps/x86_64/multiarch/strchrnul.c: Likewise. * sysdeps/x86_64/multiarch/wcschr-avx2.S: Likewise. * sysdeps/x86_64/multiarch/wcschr-sse2.S: Likewise. * sysdeps/x86_64/multiarch/wcschr.c: Likewise. * sysdeps/x86_64/multiarch/strchr.S: Removed.
Diffstat (limited to 'sysdeps/x86_64/multiarch/ifunc-impl-list.c')
| -rw-r--r-- | sysdeps/x86_64/multiarch/ifunc-impl-list.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c index 9d499ffe0b..8dda1b040a 100644 --- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c +++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c @@ -229,11 +229,21 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, IFUNC_IMPL_ADD (array, i, strcat, 1, __strcat_sse2_unaligned) IFUNC_IMPL_ADD (array, i, strcat, 1, __strcat_sse2)) - /* Support sysdeps/x86_64/multiarch/strchr.S. */ + /* Support sysdeps/x86_64/multiarch/strchr.c. */ IFUNC_IMPL (i, name, strchr, + IFUNC_IMPL_ADD (array, i, strchr, + HAS_ARCH_FEATURE (AVX2_Usable), + __strchr_avx2) IFUNC_IMPL_ADD (array, i, strchr, 1, __strchr_sse2_no_bsf) IFUNC_IMPL_ADD (array, i, strchr, 1, __strchr_sse2)) + /* Support sysdeps/x86_64/multiarch/strchrnul.c. */ + IFUNC_IMPL (i, name, strchrnul, + IFUNC_IMPL_ADD (array, i, strchrnul, + HAS_ARCH_FEATURE (AVX2_Usable), + __strchrnul_avx2) + IFUNC_IMPL_ADD (array, i, strchrnul, 1, __strchrnul_sse2)) + /* Support sysdeps/x86_64/multiarch/strcmp.S. */ IFUNC_IMPL (i, name, strcmp, IFUNC_IMPL_ADD (array, i, strcmp, HAS_CPU_FEATURE (SSE4_2), @@ -318,6 +328,13 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, IFUNC_IMPL_ADD (array, i, strstr, 1, __strstr_sse2_unaligned) IFUNC_IMPL_ADD (array, i, strstr, 1, __strstr_sse2)) + /* Support sysdeps/x86_64/multiarch/wcschr.c. */ + IFUNC_IMPL (i, name, wcschr, + IFUNC_IMPL_ADD (array, i, wcschr, + HAS_ARCH_FEATURE (AVX2_Usable), + __wcschr_avx2) + IFUNC_IMPL_ADD (array, i, wcschr, 1, __wcschr_sse2)) + /* Support sysdeps/x86_64/multiarch/wcscpy.S. */ IFUNC_IMPL (i, name, wcscpy, IFUNC_IMPL_ADD (array, i, wcscpy, HAS_CPU_FEATURE (SSSE3), |