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| author | Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> | 2016-04-20 23:10:42 +0530 |
|---|---|---|
| committer | Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> | 2016-04-22 19:23:13 +0530 |
| commit | e413b14e18ac635b5683ab7bbb1c901f79d1b06b (patch) | |
| tree | 8d6b9284ad6bbf500a9bedbd04d972cd8358ffdd /sysdeps/powerpc/powerpc64/multiarch/strcasestr-power8.S | |
| parent | 146ffc146fe3bf97cd3bc1a649f1ffa8acfa4a0d (diff) | |
| download | glibc-e413b14e18ac635b5683ab7bbb1c901f79d1b06b.tar glibc-e413b14e18ac635b5683ab7bbb1c901f79d1b06b.tar.gz glibc-e413b14e18ac635b5683ab7bbb1c901f79d1b06b.tar.bz2 glibc-e413b14e18ac635b5683ab7bbb1c901f79d1b06b.zip | |
powerpc: strcasestr optmization for power8
This patch optimizes strcasestr function for power >= 8 systems. The average
improvement of this optimization is ~40% and compares 16 bytes at a time
using vector instructions. This patch is tested on powerpc64 and powerpc64le.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/multiarch/strcasestr-power8.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/multiarch/strcasestr-power8.S | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcasestr-power8.S b/sysdeps/powerpc/powerpc64/multiarch/strcasestr-power8.S new file mode 100644 index 0000000000..c77ff9f9ee --- /dev/null +++ b/sysdeps/powerpc/powerpc64/multiarch/strcasestr-power8.S @@ -0,0 +1,49 @@ +/* Optimized strcasestr implementation for POWER8. + Copyright (C) 2016 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/>. */ + +#include <sysdep.h> + +#undef EALIGN +#define EALIGN(name, alignt, words) \ + .section ".text"; \ + ENTRY_2(__strcasestr_power8) \ + .align ALIGNARG(alignt); \ + EALIGN_W_##words; \ + BODY_LABEL(__strcasestr_power8): \ + cfi_startproc; \ + LOCALENTRY(__strcasestr_power8) + +#undef END +#define END(name) \ + cfi_endproc; \ + TRACEBACK(__strcasestr_power8) \ + END_2(__strcasestr_power8) + +#undef libc_hidden_builtin_def +#define libc_hidden_builtin_def(name) + +/* The following definitions are used in strcasestr optimization. */ + +/* strlen is used to calculate len of r4. */ +#define STRLEN __strlen_power8 +/* strnlen is used to check if len of r3 is more than r4. */ +#define STRNLEN __strnlen_power7 +/* strchr is used to check if first char of r4 is present in r3. */ +#define STRCHR __strchr_power7 + +#include <sysdeps/powerpc/powerpc64/power8/strcasestr.S> |