powerpc64: strchr/strchrnul optimization for power8

The P7 code is used for <=32B strings and for > 32B vectorized loops are used.
This shows as an average 25% improvement depending on the position of search
character.  The performance is same for shorter strings.
Tested on ppc64 and ppc64le.

6 files changed, 92 insertions, 2 deletions

diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile
index 2997b9d6fb..f5889a322b 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile
@@ -10,8 +10,8 @@ sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell \
 		   strncase-power7 strncase_l-power7 \
 		   strncmp-power9 strncmp-power8 strncmp-power7 \
 		   strncmp-power4 strncmp-ppc64 \
-		   strchr-power7 strchr-ppc64 \
-		   strchrnul-power7 strchrnul-ppc64 \
+		   strchr-power8 strchr-power7 strchr-ppc64 \
+		   strchrnul-power8 strchrnul-power7 strchrnul-ppc64 \
 		   strcpy-power8 strcpy-power7 strcpy-ppc64 stpcpy-power8 \
 		   stpcpy-power7 stpcpy-ppc64 \
 		   strrchr-power7 strrchr-ppc64 strncat-power7 strncat-ppc64 \
diff --git a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
index 2d085a206b..703a49b421 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
@@ -124,6 +124,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
   /* Support sysdeps/powerpc/powerpc64/multiarch/strchr.c.  */
   IFUNC_IMPL (i, name, strchr,
 	      IFUNC_IMPL_ADD (array, i, strchr,
+			      hwcap2 & PPC_FEATURE2_ARCH_2_07,
+			      __strchr_power8)
+	      IFUNC_IMPL_ADD (array, i, strchr,
 			      hwcap & PPC_FEATURE_HAS_VSX,
 			      __strchr_power7)
 	      IFUNC_IMPL_ADD (array, i, strchr, 1,
@@ -132,6 +135,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
   /* Support sysdeps/powerpc/powerpc64/multiarch/strchrnul.c.  */
   IFUNC_IMPL (i, name, strchrnul,
 	      IFUNC_IMPL_ADD (array, i, strchrnul,
+			      hwcap2 & PPC_FEATURE2_ARCH_2_07,
+			      __strchrnul_power8)
+	      IFUNC_IMPL_ADD (array, i, strchrnul,
 			      hwcap & PPC_FEATURE_HAS_VSX,
 			      __strchrnul_power7)
 	      IFUNC_IMPL_ADD (array, i, strchrnul, 1,
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strchr-power8.S b/sysdeps/powerpc/powerpc64/multiarch/strchr-power8.S
new file mode 100644
index 0000000000..dd0b7f5b28
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strchr-power8.S
@@ -0,0 +1,39 @@
+/* Optimized strchr implementation for POWER8.
+   Copyright (C) 2016 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>
+
+#undef ENTRY
+#define ENTRY(name)						\
+  .section ".text";						\
+  ENTRY_2(__strchr_power8)					\
+  .align ALIGNARG(2);						\
+  BODY_LABEL(__strchr_power8):					\
+  cfi_startproc;						\
+  LOCALENTRY(__strchr_power8)
+
+#undef END
+#define END(name)						\
+  cfi_endproc;							\
+  TRACEBACK(__strchr_power8)					\
+  END_2(__strchr_power8)
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/power8/strchr.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strchr.c b/sysdeps/powerpc/powerpc64/multiarch/strchr.c
index e24d6b319e..2ffb1f6c5d 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/strchr.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/strchr.c
@@ -27,11 +27,14 @@
 
 extern __typeof (strchr) __strchr_ppc attribute_hidden;
 extern __typeof (strchr) __strchr_power7 attribute_hidden;
+extern __typeof (strchr) __strchr_power8 attribute_hidden;
 # undef strchr
 
 /* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
    ifunc symbol properly.  */
 libc_ifunc_redirected (__redirect_strchr, strchr,
+		       (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+		       ? __strchr_power8 :
 		       (hwcap & PPC_FEATURE_HAS_VSX)
 		       ? __strchr_power7
 		       : __strchr_ppc);
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strchrnul-power8.S b/sysdeps/powerpc/powerpc64/multiarch/strchrnul-power8.S
new file mode 100644
index 0000000000..d0bfedac22
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strchrnul-power8.S
@@ -0,0 +1,39 @@
+/* Optimized strchrnul implementation for POWER8.
+   Copyright (C) 2016 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>
+
+#undef ENTRY
+#define ENTRY(name)						\
+  .section ".text";						\
+  ENTRY_2(__strchrnul_power8)					\
+  .align ALIGNARG(2);						\
+  BODY_LABEL(__strchrnul_power8):				\
+  cfi_startproc;						\
+  LOCALENTRY(__strchrnul_power8)
+
+#undef END
+#define END(name)						\
+  cfi_endproc;							\
+  TRACEBACK(__strchrnul_power8)					\
+  END_2(__strchrnul_power8)
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/power8/strchrnul.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strchrnul.c b/sysdeps/powerpc/powerpc64/multiarch/strchrnul.c
index 682aa0fef7..63df401d51 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/strchrnul.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/strchrnul.c
@@ -23,10 +23,13 @@
 
 extern __typeof (__strchrnul) __strchrnul_ppc attribute_hidden;
 extern __typeof (__strchrnul) __strchrnul_power7 attribute_hidden;
+extern __typeof (__strchrnul) __strchrnul_power8 attribute_hidden;
 
 /* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
    ifunc symbol properly.  */
 libc_ifunc (__strchrnul,
+	    (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+	    ? __strchrnul_power8 :
 	    (hwcap & PPC_FEATURE_HAS_VSX)
             ? __strchrnul_power7
             : __strchrnul_ppc);