powerpc64le: Optimized strcat for POWER10

This patch adds an optimized strcat which makes use of the default
strcat function which calls the Power10 strcpy and strlen routines.

sysdeps/powerpc/powerpc64/multiarch/Makefile

@@ -34,8 +34,9 @@ ifneq (,$(filter %le,$(config-machine)))
 sysdep_routines += memchr-power10 memcmp-power10 memcpy-power10 \
 		   memmove-power10 memset-power10 rawmemchr-power9 \
 		   rawmemchr-power10 strcmp-power9 strcmp-power10 \
-		   strncmp-power9 strncmp-power10 strcpy-power9 stpcpy-power9 \
+		   strncmp-power9 strncmp-power10 strcpy-power9 strcat-power10 \
-		   strlen-power9 strncpy-power9 stpncpy-power9 strlen-power10
+		   stpcpy-power9 strlen-power9 strncpy-power9 stpncpy-power9 \
+		   strlen-power10
 endif
 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

@@ -406,6 +406,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 
   /* Support sysdeps/powerpc/powerpc64/multiarch/strcat.c.  */
   IFUNC_IMPL (i, name, strcat,
+#ifdef __LITTLE_ENDIAN__
+	      IFUNC_IMPL_ADD (array, i, strcat, hwcap2 & PPC_FEATURE2_ARCH_3_1
+			      && hwcap & PPC_FEATURE_HAS_VSX,
+			      __strcat_power10)
+#endif
 	      IFUNC_IMPL_ADD (array, i, strcat,
 			      hwcap2 & PPC_FEATURE2_ARCH_2_07
 			      && hwcap & PPC_FEATURE_HAS_VSX,

sysdeps/powerpc/powerpc64/multiarch/strcat-power10.c

@@ -0,0 +1,33 @@
+/* Copyright (C) 2024 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
+   <https://www.gnu.org/licenses/ >.  */
+
+#ifdef __LITTLE_ENDIAN__
+#include <string.h>
+
+#define STRCAT __strcat_power10
+
+#undef libc_hidden_def
+#define libc_hidden_def(name)
+
+extern typeof (strcpy) __strcpy_power9;
+extern typeof (strlen) __strlen_power10;
+
+#define strcpy __strcpy_power9
+#define strlen __strlen_power10
+
+#include <string/strcat.c>
+#endif

sysdeps/powerpc/powerpc64/multiarch/strcat.c

@@ -25,14 +25,22 @@
 extern __typeof (strcat) __strcat_ppc attribute_hidden;
 extern __typeof (strcat) __strcat_power7 attribute_hidden;
 extern __typeof (strcat) __strcat_power8 attribute_hidden;
+#ifdef __LITTLE_ENDIAN__
+extern __typeof (strcat) __strcat_power10 attribute_hidden;
+#endif
 # undef strcat
 
 libc_ifunc_redirected (__redirect_strcat, strcat,
-		       (hwcap2 & PPC_FEATURE2_ARCH_2_07
+#ifdef __LITTLE_ENDIAN__
-			&& hwcap & PPC_FEATURE_HAS_VSX)
+			(hwcap2 & PPC_FEATURE2_ARCH_3_1
-		       ? __strcat_power8
+			 && hwcap & PPC_FEATURE_HAS_VSX)
-		       : (hwcap & PPC_FEATURE_ARCH_2_06
+			? __strcat_power10 :
-			  && hwcap & PPC_FEATURE_HAS_VSX)
+#endif
-			 ? __strcat_power7
+			  (hwcap2 & PPC_FEATURE2_ARCH_2_07
-			 : __strcat_ppc);
+			   && hwcap & PPC_FEATURE_HAS_VSX)
+			  ? __strcat_power8
+			   : (hwcap & PPC_FEATURE_ARCH_2_06
+			      && hwcap & PPC_FEATURE_HAS_VSX)
+			     ? __strcat_power7
+			     : __strcat_ppc);
 #endif