powerpc: Optimized strcat for POWER8/PPC64

With new optimized strcpy for POWER8, this patch adds an optimized
strcat which uses it along with default implementation at strings/.

ChangeLog

@@ -1,5 +1,14 @@
 2015-01-13  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
 
+	* sysdeps/powerpc/powerpc64/multiarch/Makefile [sysdep_routines]: Add
+	strncat-power8 object.
+	* sysdeps/powerpc/powerpc64/multiarch/strcat.c (strcat): Add
+	__strcat_power8 implementation.
+	* sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
+	(__libc_ifunc_impl_list): Add __strcat_power8 implementation.
+	* sysdeps/powerpc/powerpc64/multiarch/strcat-power8.c: New file:
+	optimized strcat for power8.
+
 	* sysdeps/powerpc/powerpc64/multiarch/Makefile [sysdep_routines]: Add
 	strcpy-power8 and stpcpy-power8 objects.
 	* sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c

sysdeps/powerpc/powerpc64/multiarch/Makefile

@@ -18,8 +18,8 @@ sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell \
 		   strrchr-power7 strrchr-ppc64 strncat-power7 strncat-ppc64 \
 		   strncpy-power7 strncpy-ppc64 \
 		   stpncpy-power7 stpncpy-ppc64 strcmp-power7 strcmp-ppc64 \
-		   strcat-power7 strcat-ppc64 memmove-power7 memmove-ppc64 \
-		   bcopy-ppc64
+		   strcat-power8 strcat-power7 strcat-ppc64 memmove-power7 \
+		   memmove-ppc64 bcopy-ppc64
 
 CFLAGS-strncase-power7.c += -mcpu=power7 -funroll-loops
 CFLAGS-strncase_l-power7.c += -mcpu=power7 -funroll-loops

sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c

@@ -302,6 +302,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 
   /* Support sysdeps/powerpc/powerpc64/multiarch/strcat.c.  */
   IFUNC_IMPL (i, name, strcat,
+	      IFUNC_IMPL_ADD (array, i, strcat,
+			      hwcap2 & PPC_FEATURE2_ARCH_2_07,
+			      __strcat_power8)
 	      IFUNC_IMPL_ADD (array, i, strcat,
 			      hwcap & PPC_FEATURE_HAS_VSX,
 			      __strcat_power7)

sysdeps/powerpc/powerpc64/multiarch/strcat-power8.c

@@ -0,0 +1,30 @@
+/* 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/ >.  */
+
+#include <string.h>
+
+#define STRCAT __strcat_power8
+
+#undef libc_hidden_def
+#define libc_hidden_def(name)
+
+extern typeof (strcpy) __strcpy_power8;
+extern typeof (strlen) __strlen_power7;
+
+#define strcpy __strcpy_power8
+#define strlen __strlen_power7
+#include <sysdeps/powerpc/strcat.c>

sysdeps/powerpc/powerpc64/multiarch/strcat.c

@@ -23,9 +23,12 @@
 
 extern __typeof (strcat) __strcat_ppc attribute_hidden;
 extern __typeof (strcat) __strcat_power7 attribute_hidden;
+extern __typeof (strcat) __strcat_power8 attribute_hidden;
 
 libc_ifunc (strcat,
-            (hwcap & PPC_FEATURE_HAS_VSX)
-            ? __strcat_power7
+            (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+            ? __strcat_power8 :
+              (hwcap & PPC_FEATURE_HAS_VSX)
+              ? __strcat_power7
             : __strcat_ppc);
 #endif