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[PATCH] Fast catenation for Power7.

From: vidya at linux dot vnet dot ibm dot com
To: libc-alpha at sourceware dot org
Cc: Vidya Ranganathan <vidya at linux dot vnet dot ibm dot com>
Date: Fri, 6 Jun 2014 10:55:31 -0400
Subject: [PATCH] Fast catenation for Power7.
Authentication-results: sourceware.org; auth=none
From: Vidya Ranganathan <vidya@linux.vnet.ibm.com>

An IFUNC version for POWER7 to call __strlen_power7/__strcpy_power7 following
logic at glibc-git/sysdeps/powerpc/strcat.c has been created. __strlen_power7
and __strcpy_power7 performs aligned memory access and improves performance
significantly.

Change log:
        * string/strcat.c: Using macro to redefine symbol name.
        * sysdeps/powerpc/strcat.c: Using macro to redefine symbol name.
        * sysdeps/powerpc/powerpc64/multiarch/Makefile: Add strcat multiarch
	optimizations.
        * sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c:
        (__libc_ifunc_impl_list): Likewise.
        * sysdeps/powerpc/powerpc64/multiarch/strcat.c: New file:
        multiarch strcat for PPC64.
        * sysdeps/powerpc/powerpc64/multiarch/strcat-ppc64.c: New file
        * sysdeps/powerpc/powerpc64/multiarch/strcat-power7.c: New file

Signed-off-by: Vidya Ranganathan <vidya@linux.vnet.ibm.com>
---
 string/strcat.c                                    |  7 +++--
 sysdeps/powerpc/powerpc64/multiarch/Makefile       |  2 +-
 .../powerpc/powerpc64/multiarch/ifunc-impl-list.c  |  8 ++++++
 .../powerpc/powerpc64/multiarch/strcat-power7.c    | 28 +++++++++++++++++++
 sysdeps/powerpc/powerpc64/multiarch/strcat-ppc64.c | 29 ++++++++++++++++++++
 sysdeps/powerpc/powerpc64/multiarch/strcat.c       | 31 ++++++++++++++++++++++
 sysdeps/powerpc/strcat.c                           |  9 ++++---
 7 files changed, 108 insertions(+), 6 deletions(-)
 create mode 100644 sysdeps/powerpc/powerpc64/multiarch/strcat-power7.c
 create mode 100644 sysdeps/powerpc/powerpc64/multiarch/strcat-ppc64.c
 create mode 100644 sysdeps/powerpc/powerpc64/multiarch/strcat.c

diff --git a/string/strcat.c b/string/strcat.c
index 2cbe8b3..14d311c 100644
--- a/string/strcat.c
+++ b/string/strcat.c
@@ -17,11 +17,14 @@
 
 #include <string.h>
 
-#undef strcat
+#ifndef STRCAT
+# undef strcat
+# define STRCAT  strcat
+#endif
 
 /* Append SRC on the end of DEST.  */
 char *
-strcat (char *dest, const char *src)
+STRCAT (char *dest, const char *src)
 {
   char *s1 = dest;
   const char *s2 = src;
diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile
index 35020a7..e5670b1 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile
@@ -17,7 +17,7 @@ sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell \
 		   strrchr-power7 strrchr-ppc64 strncat-power7 strncat-ppc64 \
 		   strspn-power7 strspn-ppc64 strcspn-power7 strcspn-ppc64 \
 		   strpbrk-power7 strpbrk-ppc64 strncpy-power7 strncpy-ppc64 \
-		   stpncpy-power7 stpncpy-ppc64
+		   stpncpy-power7 stpncpy-ppc64 strcat-power7 strcat-ppc64
 
 CFLAGS-strncase-power7.c += -mcpu=power7 -funroll-loops
 CFLAGS-strncase_l-power7.c += -mcpu=power7 -funroll-loops
diff --git a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
index d8578fb..747180a 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
@@ -294,5 +294,13 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, stpncpy, 1,
 			     __stpncpy_ppc))
 
+  /* Support sysdeps/powerpc/powerpc64/multiarch/strcat.c.  */
+  IFUNC_IMPL (i, name, strcat,
+	      IFUNC_IMPL_ADD (array, i, strcat,
+			      hwcap & PPC_FEATURE_HAS_VSX,
+			      __strcat_power7)
+	      IFUNC_IMPL_ADD (array, i, strcat, 1,
+			     __strcat_ppc))
+
   return i;
 }
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcat-power7.c b/sysdeps/powerpc/powerpc64/multiarch/strcat-power7.c
new file mode 100644
index 0000000..ba9a460
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcat-power7.c
@@ -0,0 +1,28 @@
+/* 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 STRCAT __strcat_power7
+
+#undef libc_hidden_def
+#define libc_hidden_def(name)
+
+#define strcpy __strcpy_power7
+#define strlen __strlen_power7
+
+#include <sysdeps/powerpc/strcat.c>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcat-ppc64.c b/sysdeps/powerpc/powerpc64/multiarch/strcat-ppc64.c
new file mode 100644
index 0000000..1245764
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcat-ppc64.c
@@ -0,0 +1,29 @@
+/* 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 STRCAT __strcat_ppc
+#ifdef SHARED
+# undef libc_hidden_builtin_def
+# define libc_hidden_builtin_def(name) \
+  __hidden_ver1 (__strcat_ppc, __GI_strcat, __strcat_ppc);
+#endif
+
+extern __typeof (strcat) __strcat_ppc attribute_hidden;
+
+#include <sysdeps/powerpc/strcat.c>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcat.c b/sysdeps/powerpc/powerpc64/multiarch/strcat.c
new file mode 100644
index 0000000..847a62d
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcat.c
@@ -0,0 +1,31 @@
+/* Multiple versions of strcat. 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/>.  */
+
+#ifndef NOT_IN_libc
+# include <string.h>
+# include <shlib-compat.h>
+# include "init-arch.h"
+
+extern __typeof (strcat) __strcat_ppc attribute_hidden;
+extern __typeof (strcat) __strcat_power7 attribute_hidden;
+
+libc_ifunc (strcat,
+            (hwcap & PPC_FEATURE_HAS_VSX)
+            ? __strcat_power7
+            : __strcat_ppc);
+#endif
diff --git a/sysdeps/powerpc/strcat.c b/sysdeps/powerpc/strcat.c
index 06ceca7..4ff37ea 100644
--- a/sysdeps/powerpc/strcat.c
+++ b/sysdeps/powerpc/strcat.c
@@ -18,13 +18,16 @@
 
 #include <string.h>
 
-#undef strcat
+#ifndef STRCAT
+# undef strcat
+# define STRCAT  strcat
+#endif
 
 /* Append SRC on the end of DEST.  */
 char *
-strcat (char *dest, const char *src)
+STRCAT(char *dest, const char *src)
 {
   strcpy (dest + strlen (dest), src);
   return dest;
 }
-libc_hidden_builtin_def (strcat)
+libc_hidden_builtin_def (STRCAT)
-- 
1.8.3.1
Follow-Ups:
- Re: [PATCH] Fast catenation for Power7.
  - From: Adhemerval Zanella
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