powerpc: Optimized strcpy for POWER9

This version uses VSX store vector with length instructions and is
significantly faster on small strings and relatively unaligned large
strings, compared to the POWER8 version. A few examples:

                                        __strcpy_power9  __strcpy_power8
Length   16, alignments in bytes  0/ 0: 2.52454          4.62695
Length  412, alignments in bytes  4/ 0: 11.6             22.9185

4 files changed, 38 insertions, 1 deletions

diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile
index ea936bf9ed..db11345053 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile
@@ -32,7 +32,7 @@ sysdep_routines += memcpy-power8-cached memcpy-power7 memcpy-a2 memcpy-power6 \
 		   strncase-power8
 
 ifneq (,$(filter %le,$(config-machine)))
-sysdep_routines += strcmp-power9 strncmp-power9
+sysdep_routines += strcmp-power9 strncmp-power9 strcpy-power9
 endif
 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 b9fef3f43c..ad11ede20e 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
@@ -85,6 +85,10 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 
   /* Support sysdeps/powerpc/powerpc64/multiarch/strcpy.c.  */
   IFUNC_IMPL (i, name, strcpy,
+#ifdef __LITTLE_ENDIAN__
+	      IFUNC_IMPL_ADD (array, i, strcpy, hwcap2 & PPC_FEATURE2_ARCH_3_00,
+			      __strcpy_power9)
+#endif
 	      IFUNC_IMPL_ADD (array, i, strcpy, hwcap2 & PPC_FEATURE2_ARCH_2_07,
 			      __strcpy_power8)
 	      IFUNC_IMPL_ADD (array, i, strcpy, hwcap & PPC_FEATURE_HAS_VSX,
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcpy-power9.S b/sysdeps/powerpc/powerpc64/multiarch/strcpy-power9.S
new file mode 100644
index 0000000000..d22aa0a8d6
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcpy-power9.S
@@ -0,0 +1,26 @@
+/* Optimized strcpy implementation for POWER9/PPC64.
+   Copyright (C) 2016-2020 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/>.  */
+
+#if defined __LITTLE_ENDIAN__ && IS_IN (libc)
+#define STRCPY __strcpy_power9
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/le/power9/strcpy.S>
+#endif
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcpy.c b/sysdeps/powerpc/powerpc64/multiarch/strcpy.c
index 66ea93b8f4..dcdee5181f 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/strcpy.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcpy.c
@@ -25,9 +25,16 @@
 extern __typeof (strcpy) __strcpy_ppc attribute_hidden;
 extern __typeof (strcpy) __strcpy_power7 attribute_hidden;
 extern __typeof (strcpy) __strcpy_power8 attribute_hidden;
+# ifdef __LITTLE_ENDIAN__
+extern __typeof (strcpy) __strcpy_power9 attribute_hidden;
+# endif
 #undef strcpy
 
 libc_ifunc_redirected (__redirect_strcpy, strcpy,
+# ifdef __LITTLE_ENDIAN__
+			(hwcap2 & PPC_FEATURE2_ARCH_3_00)
+			? __strcpy_power9 :
+# endif
 		       (hwcap2 & PPC_FEATURE2_ARCH_2_07)
 		       ? __strcpy_power8
 		       : (hwcap & PPC_FEATURE_HAS_VSX)