powerpc: Add optimized P8 strspn

This utilizes vectors and bitmasks.  For small needle, large
haystack, the performance improvement is upto 8x.  For short
strings (0-4B), the cost of computing the bitmask dominates,
and is a tad slower.

5 files changed, 110 insertions, 1 deletions

diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile
index 3b0e3a0117..7ed56bf292 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile
@@ -19,7 +19,8 @@ sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell \
 		   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
+		   strncpy-power8 strstr-power7 strstr-ppc64 \
+		   strspn-power8 strspn-ppc64
 
 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 11a8215ee4..3e1f099d71 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
@@ -322,6 +322,14 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, strcat, 1,
 			     __strcat_ppc))
 
+  /* Support sysdeps/powerpc/powerpc64/multiarch/strspn.c.  */
+  IFUNC_IMPL (i, name, strspn,
+             IFUNC_IMPL_ADD (array, i, strspn,
+                             hwcap2 & PPC_FEATURE2_ARCH_2_07,
+                             __strspn_power8)
+             IFUNC_IMPL_ADD (array, i, strspn, 1,
+                             __strspn_ppc))
+
   /* Support sysdeps/powerpc/powerpc64/multiarch/strstr.c.  */
   IFUNC_IMPL (i, name, strstr,
              IFUNC_IMPL_ADD (array, i, strstr,
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strspn-power8.S b/sysdeps/powerpc/powerpc64/multiarch/strspn-power8.S
new file mode 100644
index 0000000000..86a4e090d7
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strspn-power8.S
@@ -0,0 +1,40 @@
+/* Optimized strspn 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 EALIGN
+#define EALIGN(name, alignt, words)				\
+  .section ".text";						\
+  ENTRY_2(__strspn_power8)					\
+  .align ALIGNARG(alignt);					\
+  EALIGN_W_##words;						\
+  BODY_LABEL(__strspn_power8):					\
+  cfi_startproc;						\
+  LOCALENTRY(__strspn_power8)
+
+#undef END
+#define END(name)						\
+  cfi_endproc;							\
+  TRACEBACK(__strspn_power8)					\
+  END_2(__strspn_power8)
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/power8/strspn.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strspn-ppc64.c b/sysdeps/powerpc/powerpc64/multiarch/strspn-ppc64.c
new file mode 100644
index 0000000000..4c63665385
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strspn-ppc64.c
@@ -0,0 +1,25 @@
+/* Default strspn implementation for PowerPC64.
+   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/>.  */
+
+#define STRSPN __strspn_ppc
+#ifdef SHARED
+#undef libc_hidden_def
+#define libc_hidden_def(name)
+#endif
+
+#include <string/strspn.c>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strspn.c b/sysdeps/powerpc/powerpc64/multiarch/strspn.c
new file mode 100644
index 0000000000..0e653f3f6e
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strspn.c
@@ -0,0 +1,35 @@
+/* Multiple versions of strspn. PowerPC64 version.
+   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 <string.h>
+# include <shlib-compat.h>
+# include "init-arch.h"
+
+#undef strspn
+extern __typeof (strspn) __libc_strspn;
+
+extern __typeof (strspn) __strspn_ppc attribute_hidden;
+extern __typeof (strspn) __strspn_power8 attribute_hidden;
+
+libc_ifunc (__libc_strspn,
+	    (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+	    ? __strspn_power8
+	    : __strspn_ppc);
+
+weak_alias (__libc_strspn, strspn)
+libc_hidden_builtin_def (strspn)