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author | Vidya Ranganathan <vidya@linux.vnet.ibm.com> | 2014-03-10 12:20:36 -0400 |
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committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2014-03-11 08:54:33 -0500 |
commit | e65caf1f1df4ecc122da3d30689ee2e8e2bd354f (patch) | |
tree | 512c80cac0072cacd0fe600c85eb208016406138 /sysdeps/powerpc/powerpc64/multiarch/strspn.c | |
parent | ba9cc0714e58a9e8fa73cf6b0e205cbf1e6b71f2 (diff) | |
download | glibc-e65caf1f1df4ecc122da3d30689ee2e8e2bd354f.tar.gz glibc-e65caf1f1df4ecc122da3d30689ee2e8e2bd354f.tar.xz glibc-e65caf1f1df4ecc122da3d30689ee2e8e2bd354f.zip |
PowerPC: strspn optimization for PPC64/POWER7
The optimization is achieved by following techniques: > hashing of needle. > hashing avoids scanning of duplicate entries in needle across the string. > initializing the hash table with Vector instructions (VSX) by quadword access. > unrolling when scanning for character in string across hash table.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/multiarch/strspn.c')
-rw-r--r-- | sysdeps/powerpc/powerpc64/multiarch/strspn.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strspn.c b/sysdeps/powerpc/powerpc64/multiarch/strspn.c new file mode 100644 index 0000000000..44945f328e --- /dev/null +++ b/sysdeps/powerpc/powerpc64/multiarch/strspn.c @@ -0,0 +1,31 @@ +/* Multiple versions of strspn. PowerPC64 version. + Copyright (C) 2014 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 defined SHARED && !defined NOT_IN_libc +# include <string.h> +# include <shlib-compat.h> +# include "init-arch.h" + +extern __typeof (strspn) __strspn_ppc attribute_hidden; +extern __typeof (strspn) __strspn_power7 attribute_hidden; + +libc_ifunc (strspn, + (hwcap & PPC_FEATURE_HAS_VSX) + ? __strspn_power7 + : __strspn_ppc); +#endif |