powerpc: Optimize memchr for power8

Vectorized loops are used for sizes greater than 32B to improve
performance over power7 optimiztion.

4 files changed, 36 insertions, 1 deletions

diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile
index 5da9052993..f6491a2dc6 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile
@@ -4,7 +4,8 @@ sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell \
 		   memcmp-power8 memcmp-power7 memcmp-power4 memcmp-ppc64 \
 		   memset-power7 memset-power6 memset-power4 \
 		   memset-ppc64 memset-power8 \
-		   mempcpy-power7 mempcpy-ppc64 memchr-power7 memchr-ppc64 \
+		   mempcpy-power7 mempcpy-ppc64 \
+		   memchr-power8 memchr-power7 memchr-ppc64 \
 		   memrchr-power7 memrchr-ppc64 rawmemchr-power7 \
 		   rawmemchr-ppc64 strlen-power7 strlen-ppc64 \
 		   strnlen-power8 strnlen-power7 strnlen-ppc64 \
diff --git a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
index eb173f8b05..a1d3ca0088 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
@@ -183,6 +183,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
   /* Support sysdeps/powerpc/powerpc64/multiarch/memchr.c.  */
   IFUNC_IMPL (i, name, memchr,
 	      IFUNC_IMPL_ADD (array, i, memchr,
+			      hwcap2 & PPC_FEATURE2_ARCH_2_07,
+			      __memchr_power8)
+	      IFUNC_IMPL_ADD (array, i, memchr,
 			      hwcap & PPC_FEATURE_HAS_VSX,
 			      __memchr_power7)
 	      IFUNC_IMPL_ADD (array, i, memchr, 1,
diff --git a/sysdeps/powerpc/powerpc64/multiarch/memchr-power8.S b/sysdeps/powerpc/powerpc64/multiarch/memchr-power8.S
new file mode 100644
index 0000000000..30f8fe7b68
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/memchr-power8.S
@@ -0,0 +1,28 @@
+/* Optimized memchr implementation for PowerPC64/POWER8.
+   Copyright (C) 2017 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 <sysdep.h>
+
+#define MEMCHR __memchr_power8
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+#undef weak_alias
+#define weak_alias(name,alias)
+
+#include <sysdeps/powerpc/powerpc64/power8/memchr.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/memchr.c b/sysdeps/powerpc/powerpc64/multiarch/memchr.c
index f6f4babc09..fa2cfd5ea6 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/memchr.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/memchr.c
@@ -23,10 +23,13 @@
 
 extern __typeof (__memchr) __memchr_ppc attribute_hidden;
 extern __typeof (__memchr) __memchr_power7 attribute_hidden;
+extern __typeof (__memchr) __memchr_power8 attribute_hidden;
 
 /* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
    ifunc symbol properly.  */
 libc_ifunc (__memchr,
+	    (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+	    ? __memchr_power8 :
 	    (hwcap & PPC_FEATURE_HAS_VSX)
             ? __memchr_power7
             : __memchr_ppc);