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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.c | |
| 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.c')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/multiarch/strstr.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strstr.c b/sysdeps/powerpc/powerpc64/multiarch/strstr.c new file mode 100644 index 0000000000..2be764660a --- /dev/null +++ b/sysdeps/powerpc/powerpc64/multiarch/strstr.c @@ -0,0 +1,34 @@ +/* Multiple versions of strstr. PowerPC64 version. + 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/>. */ + +/* Define multiple versions only for definition in libc. */ +#if IS_IN (libc) +# include <string.h> +# include <shlib-compat.h> +# include "init-arch.h" + +extern __typeof (strstr) __strstr_ppc attribute_hidden; +extern __typeof (strstr) __strstr_power7 attribute_hidden; + +/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle + ifunc symbol properly. */ +libc_ifunc (strstr, + (hwcap & PPC_FEATURE_HAS_VSX) + ? __strstr_power7 + : __strstr_ppc); +#endif |