powerpc: strcmp optimization for power9

Vectorized loops are used for strings > 32B when compared
to power8 optimization.

Tested on power9 ppc64le simulator.

4 files changed, 48 insertions, 1 deletions

diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile
index e3ac285..2c83c22 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile
@@ -16,7 +16,7 @@ sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell \
 		   strrchr-power7 strrchr-ppc64 strncat-power7 strncat-ppc64 \
 		   strncpy-power7 strncpy-ppc64 \
 		   stpncpy-power8 stpncpy-power7 stpncpy-ppc64 \
-		   strcmp-power8 strcmp-power7 strcmp-ppc64 \
+		   strcmp-power9 strcmp-power8 strcmp-power7 strcmp-ppc64 \
 		   strcat-power8 strcat-power7 strcat-ppc64 \
 		   memmove-power7 memmove-ppc64 wordcopy-ppc64 bcopy-ppc64 \
 		   strncpy-power8 strstr-power7 strstr-ppc64 \
diff --git a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
index 9f6bd7c..4427941 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
@@ -311,6 +311,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
   /* Support sysdeps/powerpc/powerpc64/multiarch/strcmp.c.  */
   IFUNC_IMPL (i, name, strcmp,
 	      IFUNC_IMPL_ADD (array, i, strcmp,
+			      hwcap2 & PPC_FEATURE2_ARCH_3_00,
+			      __strcmp_power9)
+	      IFUNC_IMPL_ADD (array, i, strcmp,
 			      hwcap2 & PPC_FEATURE2_ARCH_2_07,
 			      __strcmp_power8)
 	      IFUNC_IMPL_ADD (array, i, strcmp,
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcmp-power9.S b/sysdeps/powerpc/powerpc64/multiarch/strcmp-power9.S
new file mode 100644
index 0000000..0a09e5b
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcmp-power9.S
@@ -0,0 +1,40 @@
+/* Optimized strcmp implementation for POWER9/PPC64.
+   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 EALIGN
+#define EALIGN(name, alignt, words)				\
+  .section ".text";						\
+  ENTRY_2(__strcmp_power9)					\
+  .align ALIGNARG(alignt);					\
+  EALIGN_W_##words;						\
+  BODY_LABEL(__strcmp_power9):					\
+  cfi_startproc;						\
+  LOCALENTRY(__strcmp_power9)
+
+#undef END
+#define END(name)						\
+  cfi_endproc;							\
+  TRACEBACK(__strcmp_power9)					\
+  END_2(__strcmp_power9)
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/power9/strcmp.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcmp.c b/sysdeps/powerpc/powerpc64/multiarch/strcmp.c
index 06f89cb..6e8d699 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/strcmp.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcmp.c
@@ -27,9 +27,13 @@
 extern __typeof (strcmp) __strcmp_ppc attribute_hidden;
 extern __typeof (strcmp) __strcmp_power7 attribute_hidden;
 extern __typeof (strcmp) __strcmp_power8 attribute_hidden;
+extern __typeof (strcmp) __strcmp_power9 attribute_hidden;
+
 # undef strcmp
 
 libc_ifunc_redirected (__redirect_strcmp, strcmp,
+			(hwcap2 & PPC_FEATURE2_ARCH_3_00)
+			? __strcmp_power9 :
 		       (hwcap2 & PPC_FEATURE2_ARCH_2_07)
 		       ? __strcmp_power8
 		       : (hwcap & PPC_FEATURE_HAS_VSX)