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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/wcschr-sse2.S | |
| parent | dc485ceb2ac596d27294cc1942adf3181f15e8bf (diff) | |
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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/wcschr-sse2.S')
| -rw-r--r-- | sysdeps/x86_64/multiarch/wcschr-sse2.S | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/wcschr-sse2.S b/sysdeps/x86_64/multiarch/wcschr-sse2.S new file mode 100644 index 0000000000..9a1b45aaac --- /dev/null +++ b/sysdeps/x86_64/multiarch/wcschr-sse2.S @@ -0,0 +1,30 @@ +/* wcschr optimized with SSE2. + Copyright (C) 2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#if IS_IN (libc) +# define __wcschr __wcschr_sse2 + +# undef weak_alias +# define weak_alias(__wcschr, wcschr) +# undef libc_hidden_def +# define libc_hidden_def(__wcschr) +# undef libc_hidden_weak +# define libc_hidden_weak(wcschr) +#endif + +#include "../wcschr.S" |