From e65caf1f1df4ecc122da3d30689ee2e8e2bd354f Mon Sep 17 00:00:00 2001 From: Vidya Ranganathan Date: Mon, 10 Mar 2014 12:20:36 -0400 Subject: 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. --- sysdeps/powerpc/powerpc64/multiarch/strspn.c | 31 ++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 sysdeps/powerpc/powerpc64/multiarch/strspn.c (limited to 'sysdeps/powerpc/powerpc64/multiarch/strspn.c') 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 + . */ + +#if defined SHARED && !defined NOT_IN_libc +# include +# include +# 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 -- cgit 1.4.1