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| author | Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> | 2015-06-24 02:08:21 -0400 |
|---|---|---|
| committer | Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com> | 2015-07-16 13:43:51 -0300 |
| commit | b42f8cad52ebfbfd43ebf6e42e606b489ffbd466 (patch) | |
| tree | ec8f4655557211a79429140e55b12d100a2745d7 /sysdeps/powerpc/powerpc64/multiarch/strstr-power7.S | |
| parent | 6b96d6de8ccd1c04f172a43d3785960e0a76be3f (diff) | |
| download | glibc-b42f8cad52ebfbfd43ebf6e42e606b489ffbd466.tar.gz glibc-b42f8cad52ebfbfd43ebf6e42e606b489ffbd466.tar.xz glibc-b42f8cad52ebfbfd43ebf6e42e606b489ffbd466.zip | |
powerpc: strstr optimization
This patch optimizes strstr function for power >= 7 systems. Performance gain is obtained using aligned memory access and usage of cmpb instruction for quicker comparison. The average improvement of this optimization is ~40%. Tested on ppc64 and ppc64le. 2015-07-16 Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> * sysdeps/powerpc/powerpc64/multiarch/Makefile: Add strstr(). * sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c: Likewise. * sysdeps/powerpc/powerpc64/power7/strstr.S: New File. * sysdeps/powerpc/powerpc64/multiarch/strstr-power7.S: New File. * sysdeps/powerpc/powerpc64/multiarch/strstr-ppc64.c: New File. * sysdeps/powerpc/powerpc64/multiarch/strstr.c: New File.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/multiarch/strstr-power7.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/multiarch/strstr-power7.S | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strstr-power7.S b/sysdeps/powerpc/powerpc64/multiarch/strstr-power7.S new file mode 100644 index 0000000000..94ce95b821 --- /dev/null +++ b/sysdeps/powerpc/powerpc64/multiarch/strstr-power7.S @@ -0,0 +1,44 @@ +/* Optimized strstr implementation for POWER7. + Copyright (C) 2015 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(__strstr_power7) \ + .align ALIGNARG(alignt); \ + EALIGN_W_##words; \ + BODY_LABEL(__strstr_power7): \ + cfi_startproc; \ + LOCALENTRY(__strstr_power7) + +#undef END +#define END(name) \ + cfi_endproc; \ + TRACEBACK(__strstr_power7) \ + END_2(__strstr_power7) + +#undef libc_hidden_builtin_def +#define libc_hidden_builtin_def(name) + +#define STRLEN __strlen_power7 +#define STRNLEN __strnlen_power7 +#define STRCHR __strchr_power7 + +#include <sysdeps/powerpc/powerpc64/power7/strstr.S> |