[PATCH] powerpc: Add optimized strcspn for P8

["Paul E. Murphy" <murphyp at linux dot vnet dot ibm dot com>]

A few minor adjustments to the P8 strspn gives us
an almost equally optimized P8 strcspn.

2016-04-13  Paul E. Murphy  <murphyp@linux.vnet.ibm.com>

	* sysdeps/powerpc/powerpc64/multiarch/Makefile:
	(sysdep_routines): Add P8 and PPC64 strcspn targets.
	* sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c:
	(__libc_ifunc_impl_list): Add entries for P8 and PPC64
	ifunc'ed strcspn.
	* sysdeps/powerpc/powerpc64/multiarch/strcspn-power8.S:
	New file.
	* sysdeps/powerpc/powerpc64/multiarch/strcspn-ppc64.c:
	Likewise.
	* sysdeps/powerpc/powerpc64/multiarch/strcspn.c:
	Likewise.
	* sysdeps/powerpc/powerpc64/power8/strcspn.S:
	Likewise.
	* sysdeps/powerpc/powerpc64/power8/strspn.S:
	[INITIAL_MASK]: New macro.
	[STRCSPN]: Likewise.
	[UPDATE_MASK]: Likewise.
	[USE_AS_STRCSPN]: Lisewise.
---
 sysdeps/powerpc/powerpc64/multiarch/Makefile       |  2 +-
 .../powerpc/powerpc64/multiarch/ifunc-impl-list.c  |  8 +++++
 .../powerpc/powerpc64/multiarch/strcspn-power8.S   | 40 +++++++++++++++++++++
 .../powerpc/powerpc64/multiarch/strcspn-ppc64.c    | 26 ++++++++++++++
 sysdeps/powerpc/powerpc64/multiarch/strcspn.c      | 35 ++++++++++++++++++
 sysdeps/powerpc/powerpc64/power8/strcspn.S         | 20 +++++++++++
 sysdeps/powerpc/powerpc64/power8/strspn.S          | 41 ++++++++++++++++------
 7 files changed, 160 insertions(+), 12 deletions(-)
 create mode 100644 sysdeps/powerpc/powerpc64/multiarch/strcspn-power8.S
 create mode 100644 sysdeps/powerpc/powerpc64/multiarch/strcspn-ppc64.c
 create mode 100644 sysdeps/powerpc/powerpc64/multiarch/strcspn.c
 create mode 100644 sysdeps/powerpc/powerpc64/power8/strcspn.S

diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile
index 7ed56bf..1d742bd 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile
@@ -20,7 +20,7 @@ sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell \
 		   strcat-power8 strcat-power7 strcat-ppc64 \
 		   memmove-power7 memmove-ppc64 wordcopy-ppc64 bcopy-ppc64 \
 		   strncpy-power8 strstr-power7 strstr-ppc64 \
-		   strspn-power8 strspn-ppc64
+		   strspn-power8 strspn-ppc64 strcspn-power8 strcspn-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 3e1f099..71a5f0b 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
@@ -330,6 +330,14 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
              IFUNC_IMPL_ADD (array, i, strspn, 1,
                              __strspn_ppc))
 
+  /* Support sysdeps/powerpc/powerpc64/multiarch/strcspn.c.  */
+  IFUNC_IMPL (i, name, strcspn,
+             IFUNC_IMPL_ADD (array, i, strcspn,
+                             hwcap2 & PPC_FEATURE2_ARCH_2_07,
+                             __strcspn_power8)
+             IFUNC_IMPL_ADD (array, i, strcspn, 1,
+                             __strcspn_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/strcspn-power8.S b/sysdeps/powerpc/powerpc64/multiarch/strcspn-power8.S
new file mode 100644
index 0000000..5da5a77
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcspn-power8.S
@@ -0,0 +1,40 @@
+/* Optimized strcspn 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(__strcspn_power8)					\
+  .align ALIGNARG(alignt);					\
+  EALIGN_W_##words;						\
+  BODY_LABEL(__strcspn_power8):					\
+  cfi_startproc;						\
+  LOCALENTRY(__strcspn_power8)
+
+#undef END
+#define END(name)						\
+  cfi_endproc;							\
+  TRACEBACK(__strcspn_power8)					\
+  END_2(__strcspn_power8)
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/power8/strcspn.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcspn-ppc64.c b/sysdeps/powerpc/powerpc64/multiarch/strcspn-ppc64.c
new file mode 100644
index 0000000..4c16386
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcspn-ppc64.c
@@ -0,0 +1,26 @@
+/* Default strcspn 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 STRCSPN __strcspn_ppc
+
+#ifdef SHARED
+#  undef libc_hidden_def
+#  define libc_hidden_def(name)
+#endif
+
+#include <string/strcspn.c>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcspn.c b/sysdeps/powerpc/powerpc64/multiarch/strcspn.c
new file mode 100644
index 0000000..e7343ee
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcspn.c
@@ -0,0 +1,35 @@
+/* Multiple versions of strcspn. 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 strcspn
+extern __typeof (strcspn) __libc_strcspn;
+
+extern __typeof (strcspn) __strcspn_ppc attribute_hidden;
+extern __typeof (strcspn) __strcspn_power8 attribute_hidden;
+
+libc_ifunc (__libc_strcspn,
+	    (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+	    ? __strcspn_power8
+	    : __strcspn_ppc);
+
+weak_alias (__libc_strcspn, strcspn)
+libc_hidden_builtin_def (strcspn)
diff --git a/sysdeps/powerpc/powerpc64/power8/strcspn.S b/sysdeps/powerpc/powerpc64/power8/strcspn.S
new file mode 100644
index 0000000..bfc58a8
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/power8/strcspn.S
@@ -0,0 +1,20 @@
+/* Optimized strcspn implementation for PowerPC64/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/>.  */
+
+#define USE_AS_STRCSPN 1
+#include <sysdeps/powerpc/powerpc64/power8/strspn.S>
diff --git a/sysdeps/powerpc/powerpc64/power8/strspn.S b/sysdeps/powerpc/powerpc64/power8/strspn.S
index 0dda437..6e5d639 100644
--- a/sysdeps/powerpc/powerpc64/power8/strspn.S
+++ b/sysdeps/powerpc/powerpc64/power8/strspn.S
@@ -33,6 +33,17 @@
 
 #include "sysdep.h"
 
+#ifndef USE_AS_STRCSPN
+#  define USE_AS_STRCSPN 0
+#  define STRSPN strspn
+#  define INITIAL_MASK 0
+#  define UPDATE_MASK(RA, RS, RB) or	RA, RS, RB
+#else
+#  define STRSPN strcspn
+#  define INITIAL_MASK -1
+#  define UPDATE_MASK(RA, RS, RB) andc	RA, RS, RB
+#endif
+
 /* Simple macro to use VSX instructions in overlapping VR's.  */
 #define XXVR(insn, vrt, vra, vrb) \
 	insn 32+vrt, 32+vra, 32+vrb
@@ -53,7 +64,7 @@
 	/* This can be updated to power8 once the minimum version of
 	   binutils supports power8 and the above instructions.  */
 	.machine power7
-EALIGN(strspn, 4, 0)
+EALIGN(STRSPN, 4, 0)
 	CALL_MCOUNT 2
 
 	/* Generate useful constants for later on.  */
@@ -66,10 +77,18 @@ EALIGN(strspn, 4, 0)
 
 	/* Prepare to compute 256b mask.  */
 	addi	r4, r4, -1
-	li	r5, 0
-	li	r6, 0
-	li	r7, 0
-	li	r8, 0
+	li	r5, INITIAL_MASK
+	li	r6, INITIAL_MASK
+	li	r7, INITIAL_MASK
+	li	r8, INITIAL_MASK
+
+#if USE_AS_STRCSPN
+	/* Ensure the null character never matches by clearing ISA bit 0 in
+	   in r5 which is the bit which will check for it in the later usage
+	   of vbpermq.  */
+	srdi	r5, r5, 1
+#endif
+
 	li	r11, 1
 	sldi	r11, r11, 63
 
@@ -97,14 +116,14 @@ L(next_needle):
 
 	/* Now, or the value into the correct GPR.  */
 	bge cr1,L(needle_gt128)
-	or	r5, r5, r10	/* 0 - 63.  */
-	or	r6, r6, r12	/* 64 - 127.  */
+	UPDATE_MASK (r5, r5, r10)	/* 0 - 63.  */
+	UPDATE_MASK (r6, r6, r12)	/* 64 - 127.  */
 	b L(next_needle)
 
 	.align 4
 L(needle_gt128):
-	or	r7, r7, r10	/* 128 - 191.  */
-	or	r8, r8, r12	/* 192 - 255.  */
+	UPDATE_MASK (r7, r7, r10)	/* 128 - 191.  */
+	UPDATE_MASK (r8, r8, r12)	/* 192 - 255.  */
 	b L(next_needle)
 
 
@@ -175,5 +194,5 @@ L(done):
 	add	r3, r3, r10
 	blr
 
-END(strspn)
-libc_hidden_builtin_def (strspn)
+END(STRSPN)
+libc_hidden_builtin_def (STRSPN)
-- 
2.4.11