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authorRajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com>2014-03-03 08:06:41 -0600
committerAdhemerval Zanella <azanella@linux.vnet.ibm.com>2014-03-03 08:06:41 -0600
commitc7debbdfacbef150aaf9113eb05ccaf2b9e7af6c (patch)
treebaf78c9b58faa86b3996ae3745cb81fd50e2fb58 /sysdeps/powerpc/powerpc64/multiarch/strrchr-ppc64.c
parent235eed8644eb2deebf839b13b418dbd47bb14c5a (diff)
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PowerPC: strrchr optimization for POWER7/PPC64
This patch optimizes strrchr() for ppc64. It uses aligned memory
access along with cmpb instruction and CPU prefetch to avoid
cache misses for speed improvement.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/multiarch/strrchr-ppc64.c')
-rw-r--r--sysdeps/powerpc/powerpc64/multiarch/strrchr-ppc64.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strrchr-ppc64.c b/sysdeps/powerpc/powerpc64/multiarch/strrchr-ppc64.c
new file mode 100644
index 0000000000..5633a9f003
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strrchr-ppc64.c
@@ -0,0 +1,33 @@
+/* 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/>.  */
+
+#include <string.h>
+
+#define STRRCHR __strrchr_ppc
+#undef weak_alias
+#define weak_alias(name, aliasname) \
+  extern __typeof (__strrchr_ppc) aliasname \
+    __attribute__ ((weak, alias ("__strrchr_ppc")));
+#if !defined(NOT_IN_libc) && defined(SHARED)
+# undef libc_hidden_builtin_def
+# define libc_hidden_builtin_def(name) \
+  __hidden_ver1(__strrchr_ppc, __GI_strrchr, __strrchr_ppc);
+#endif
+
+extern __typeof (strrchr) __strrchr_ppc attribute_hidden;
+
+#include <string/strrchr.c>