S390: Optimize strnlen and wcsnlen.

This patch provides optimized versions of strnlen and wcsnlen with the z13
vector instructions.

ChangeLog:

	* sysdeps/s390/multiarch/strnlen-c.c: New File.
	* sysdeps/s390/multiarch/strnlen-vx.S: Likewise.
	* sysdeps/s390/multiarch/strnlen.c: Likewise.
	* sysdeps/s390/multiarch/wcsnlen-c.c: Likewise.
	* sysdeps/s390/multiarch/wcsnlen-vx.S: Likewise.
	* sysdeps/s390/multiarch/wcsnlen.c: Likewise.
	* sysdeps/s390/multiarch/Makefile (sysdep_routines): Add strnlen and
	wcsnlen functions.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Add ifunc test for strnlen, wcsnlen.
	* wcsmbs/wcsnlen.c: Use WCSNLEN if defined.
	* string/test-strnlen.c: Add wcsnlen support.
	* wcsmbs/test-wcsnlen.c: New File.
	* wcsmbs/Makefile (strop-tests): Add wcsnlen.
	* benchtests/bench-strnlen.c: Add wcsnlen support.
	* benchtests/bench-wcsnlen.c: New File.
	* benchtests/Makefile (wcsmbs-bench): Add wcsnlen.

8 files changed, 404 insertions, 2 deletions

diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
index 3a9809847c..3397f2403b 100644
--- a/sysdeps/s390/multiarch/Makefile
+++ b/sysdeps/s390/multiarch/Makefile
@@ -1,7 +1,9 @@
 ifeq ($(subdir),string)
-sysdep_routines += strlen strlen-vx strlen-c
+sysdep_routines += strlen strlen-vx strlen-c \
+		   strnlen strnlen-vx strnlen-c
 endif
 
 ifeq ($(subdir),wcsmbs)
-sysdep_routines += wcslen wcslen-vx wcslen-c
+sysdep_routines += wcslen wcslen-vx wcslen-c \
+		   wcsnlen wcsnlen-vx wcsnlen-c
 endif
diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
index e9639ef02f..bc17c59517 100644
--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
@@ -82,6 +82,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
   IFUNC_VX_IMPL (strlen);
   IFUNC_VX_IMPL (wcslen);
 
+  IFUNC_VX_IMPL (strnlen);
+  IFUNC_VX_IMPL (wcsnlen);
+
 #endif /* HAVE_S390_VX_ASM_SUPPORT */
 
   return i;
diff --git a/sysdeps/s390/multiarch/strnlen-c.c b/sysdeps/s390/multiarch/strnlen-c.c
new file mode 100644
index 0000000000..72e82aeec1
--- /dev/null
+++ b/sysdeps/s390/multiarch/strnlen-c.c
@@ -0,0 +1,30 @@
+/* Default strnlen implementation for S/390.
+   Copyright (C) 2015 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/>.  */
+
+#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
+# define STRNLEN  __strnlen_c
+# ifdef SHARED
+#  undef libc_hidden_def
+#  define libc_hidden_def(name)					\
+  __hidden_ver1 (__strnlen_c, __GI_strnlen, __strnlen_c);	\
+  strong_alias (__strnlen_c, __strnlen_c_1);			\
+  __hidden_ver1 (__strnlen_c_1, __GI___strnlen, __strnlen_c_1);
+# endif /* SHARED */
+
+# include <string/strnlen.c>
+#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
diff --git a/sysdeps/s390/multiarch/strnlen-vx.S b/sysdeps/s390/multiarch/strnlen-vx.S
new file mode 100644
index 0000000000..12c49debf1
--- /dev/null
+++ b/sysdeps/s390/multiarch/strnlen-vx.S
@@ -0,0 +1,134 @@
+/* Vector optimized 32/64 bit S/390 version of strnlen.
+   Copyright (C) 2015 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/>.  */
+
+#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
+
+# include "sysdep.h"
+# include "asm-syntax.h"
+
+	.text
+
+/* size_t strnlen (const char *s, size_t maxlen)
+   Returns the number of characters in s or at most maxlen.
+
+   Register usage:
+   -r1=tmp
+   -r2=address of string
+   -r3=maxlen (number of characters to be read)
+   -r4=tmp
+   -r5=current_len and return_value
+   -v16=part of s
+*/
+ENTRY(__strnlen_vx)
+	.machine "z13"
+	.machinemode "zarch_nohighgprs"
+
+# if !defined __s390x__
+	llgfr	%r3,%r3
+# endif /* !defined __s390x__ */
+
+	clgfi	%r3,0		/* if maxlen == 0, return 0.  */
+	locgre	%r2,%r3
+	ber	%r14
+
+	vlbb	%v16,0(%r2),6	/* Load s until next 4k-byte boundary.  */
+	lcbb	%r1,0(%r2),6	/* Get bytes to 4k-byte boundary or 16.  */
+	llgfr	%r1,%r1		/* Convert 32bit to 64bit.  */
+
+	vfenezb	%v16,%v16,%v16	/* Find element not equal with zero search.  */
+	clgr	%r1,%r3
+	locgrh	%r1,%r3		/* loaded_byte_count
+				   = min (loaded_byte_count, maxlen)  */
+
+	vlgvb	%r5,%v16,7	/* Load zero index or 16 if not found.  */
+	clr	%r5,%r1		/* If found zero within loaded bytes?  */
+	locgrl	%r2,%r5		/* Then copy return value.  */
+	blr	%r14		/* And return.  */
+
+	clgr	%r1,%r3		/* If loaded_byte_count == maxlen?  */
+	locgre	%r2,%r3		/* Then copy return value.  */
+	ber	%r14		/* And return.  */
+
+	/* Align s to 16 byte.  */
+	risbgn	%r4,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
+	lghi	%r5,16		/* current_len = 16.  */
+	slr	%r5,%r4		/* Compute bytes to 16bytes boundary.  */
+
+	lgr	%r1,%r5		/* If %r5 + 64 < maxlen? -> loop64.  */
+	aghi	%r1,64
+	clgrjl	%r1,%r3,.Lloop64
+
+	/* Find zero in max 64byte with aligned s.  */
+.Llt64:
+	vl	%v16,0(%r5,%r2) /* Load s.  */
+	vfenezbs %v16,%v16,%v16	/* Find element not equal with zero search.  */
+	je	.Lfound		/* Jump away if zero was found.  */
+	aghi	%r5,16
+	clgrjhe	%r5,%r3,.Lfound /* current_len >= maxlen -> end.  */
+	vl	%v16,0(%r5,%r2)
+	vfenezbs %v16,%v16,%v16
+	je	.Lfound
+	aghi	%r5,16
+	clgrjhe	%r5,%r3,.Lfound
+	vl	%v16,0(%r5,%r2)
+	vfenezbs %v16,%v16,%v16
+	je	.Lfound
+	aghi	%r5,16
+	clgrjhe	%r5,%r3,.Lfound
+	vl	%v16,0(%r5,%r2)
+	vfenezbs %v16,%v16,%v16
+	j	.Lfound
+
+.Lfound48:
+	aghi	%r5,16
+.Lfound32:
+	aghi	%r5,16
+.Lfound16:
+	aghi	%r5,16
+.Lfound:
+	vlgvb	%r4,%v16,7	/* Load byte index of zero or 16 if no zero.  */
+	algr	%r5,%r4
+
+	clgr	%r5,%r3
+	locgrh	%r5,%r3		/* Return min (current_len, maxlen).  */
+	lgr	%r2,%r5
+	br	%r14
+
+	/* Find zero in 16 byte aligned loop.  */
+.Lloop64:
+	vl	%v16,0(%r5,%r2) /* Load s.  */
+	vfenezbs %v16,%v16,%v16	/* Find element not equal with zero search.  */
+	je	.Lfound		/* Jump away if zero was found.  */
+	vl	%v16,16(%r5,%r2)
+	vfenezbs %v16,%v16,%v16
+	je	.Lfound16
+	vl	%v16,32(%r5,%r2)
+	vfenezbs %v16,%v16,%v16
+	je	.Lfound32
+	vl	%v16,48(%r5,%r2)
+	vfenezbs %v16,%v16,%v16
+	je	.Lfound48
+
+	aghi	%r5,64
+	lgr	%r1,%r5		/* If %r5 + 64 < maxlen? -> loop64.  */
+	aghi	%r1,64
+	clgrjl	%r1,%r3,.Lloop64
+
+	j	.Llt64
+END(__strnlen_vx)
+#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
diff --git a/sysdeps/s390/multiarch/strnlen.c b/sysdeps/s390/multiarch/strnlen.c
new file mode 100644
index 0000000000..51659dea7d
--- /dev/null
+++ b/sysdeps/s390/multiarch/strnlen.c
@@ -0,0 +1,29 @@
+/* Multiple versions of strnlen.
+   Copyright (C) 2015 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/>.  */
+
+#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
+# include <string.h>
+# include <ifunc-resolve.h>
+
+s390_vx_libc_ifunc (__strnlen)
+weak_alias (__strnlen, strnlen)
+libc_hidden_def (strnlen)
+
+#else
+# include <string/strnlen.c>
+#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
diff --git a/sysdeps/s390/multiarch/wcsnlen-c.c b/sysdeps/s390/multiarch/wcsnlen-c.c
new file mode 100644
index 0000000000..1ead4b1951
--- /dev/null
+++ b/sysdeps/s390/multiarch/wcsnlen-c.c
@@ -0,0 +1,25 @@
+/* Default wcsnlen implementation for S/390.
+   Copyright (C) 2015 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/>.  */
+
+#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
+# define WCSNLEN  __wcsnlen_c
+
+# include <wchar.h>
+extern __typeof (__wcsnlen) __wcsnlen_c;
+# include <wcsmbs/wcsnlen.c>
+#endif
diff --git a/sysdeps/s390/multiarch/wcsnlen-vx.S b/sysdeps/s390/multiarch/wcsnlen-vx.S
new file mode 100644
index 0000000000..7932e1bcaf
--- /dev/null
+++ b/sysdeps/s390/multiarch/wcsnlen-vx.S
@@ -0,0 +1,151 @@
+/* Vector optimized 32/64 bit S/390 version of wcsnlen.
+   Copyright (C) 2015 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/>.  */
+
+#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
+
+# include "sysdep.h"
+# include "asm-syntax.h"
+
+	.text
+
+/* size_t wcsnlen (const wchar_t *s, size_t maxlen)
+   Returns the number of characters in s or at most maxlen.
+
+   Register usage:
+   -r1=tmp
+   -r2=address of string
+   -r3=maxlen (number of characters to be read)
+   -r4=tmp
+   -r5=current_len and return_value
+   -v16=part of s
+*/
+ENTRY(__wcsnlen_vx)
+
+	.machine "z13"
+	.machinemode "zarch_nohighgprs"
+
+# if !defined __s390x__
+	llgfr	%r3,%r3
+# endif /* !defined __s390x__ */
+
+	clgfi	%r3,0		/* if maxlen == 0, return 0.  */
+	locgre	%r2,%r3
+	ber	%r14
+
+	vlbb	%v16,0(%r2),6	/* Load s until next 4k-byte boundary.  */
+	lcbb	%r1,0(%r2),6	/* Get bytes to 4k-byte boundary or 16.  */
+	llgfr	%r1,%r1		/* Convert 32bit to 64bit.  */
+
+	tmll	%r2,3		/* Test if s is 4-byte aligned?  */
+	jne	.Lfallback	/* And use common-code variant if not.  */
+
+	/* Check range of maxlen and convert to byte-count.  */
+# ifdef __s390x__
+	tmhh	%r3,49152	/* Test bit 0 or 1 of maxlen.  */
+	lghi	%r4,-4		/* Max byte-count is 18446744073709551612.  */
+# else
+	tmlh	%r3,49152	/* Test bit 0 or 1 of maxlen.  */
+	llilf	%r4,4294967292	/* Max byte-count is 4294967292.  */
+# endif /* !__s390x__ */
+	sllg	%r3,%r3,2	/* Convert character-count to byte-count.  */
+	locgrne	%r3,%r4		/* Use max byte-count, if bit 0/1 was one.  */
+
+	vfenezf	%v16,%v16,%v16	/* Find element not equal with zero search.  */
+	clgr	%r1,%r3
+	locgrh	%r1,%r3		/* loaded_byte_count
+				   = min (loaded_byte_count, maxlen)  */
+
+	vlgvb	%r5,%v16,7	/* Load zero index or 16 if not found.  */
+	clrjl	%r5,%r1,.Lend	/* Found zero within loaded bytes -> return.  */
+
+	clgr	%r1,%r3		/* If loaded_byte_count == maxlen -> end.  */
+	locgre	%r5,%r3
+	je	.Lend
+
+	/* Align s to 16 byte.  */
+	risbgn	%r4,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
+	lghi	%r5,16		/* current_len = 16.  */
+	slr	%r5,%r4		/* Compute bytes to 16bytes boundary.  */
+
+	lgr	%r1,%r5		/* If %r5 + 64 < maxlen? -> loop64.  */
+	aghi	%r1,64
+	clgrjl	%r1,%r3,.Lloop64
+
+	/* Find zero in max 64byte with aligned s.  */
+.Llt64:
+	vl	%v16,0(%r5,%r2)	/* Load s.  */
+	vfenezfs %v16,%v16,%v16	/* Find element not equal with zero search.  */
+	je	.Lfound		/* Jump away if zero was found.  */
+	aghi	%r5,16
+	clgrjhe	%r5,%r3,.Lfound /* If current_len >= maxlen -> end.  */
+	vl	%v16,0(%r5,%r2)
+	vfenezfs %v16,%v16,%v16
+	je	.Lfound
+	aghi	%r5,16
+	clgrjhe	%r5,%r3,.Lfound
+	vl	%v16,0(%r5,%r2)
+	vfenezfs %v16,%v16,%v16
+	je	.Lfound
+	aghi	%r5,16
+	clgrjhe	%r5,%r3,.Lfound
+	vl	%v16,0(%r5,%r2)
+	vfenezfs %v16,%v16,%v16
+	j	.Lfound
+
+.Lfound48:
+	aghi	%r5,16
+.Lfound32:
+	aghi	%r5,16
+.Lfound16:
+	aghi	%r5,16
+.Lfound:
+	vlgvb	%r4,%v16,7	/* Load byte index of zero or 16 if no zero.  */
+	algr	%r5,%r4
+
+	clgr	%r5,%r3
+	locgrh	%r5,%r3		/* Return min (current_len, maxlen).  */
+.Lend:
+	srlg	%r2,%r5,2	/* Convert byte-count to character-count.  */
+	br	%r14
+
+	/* Find zero in 16byte aligned loop.  */
+.Lloop64:
+	vl	%v16,0(%r5,%r2)	/* Load s.  */
+	vfenezfs %v16,%v16,%v16	/* Find element not equal with zero search.  */
+	je	.Lfound		/* Jump away if zero was found.  */
+	vl	%v16,16(%r5,%r2)
+	vfenezfs %v16,%v16,%v16
+	je	.Lfound16
+	vl	%v16,32(%r5,%r2)
+	vfenezfs %v16,%v16,%v16
+	je	.Lfound32
+	vl	%v16,48(%r5,%r2)
+	vfenezfs %v16,%v16,%v16
+	je	.Lfound48
+
+	aghi	%r5,64
+	lgr	%r1,%r5		/* If %r5 + 64 < maxlen? -> loop64.  */
+	aghi	%r1,64
+	clgrjl	%r1,%r3,.Lloop64
+
+	j	.Llt64
+
+.Lfallback:
+	jg	__wcsnlen_c
+END(__wcsnlen_vx)
+#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
diff --git a/sysdeps/s390/multiarch/wcsnlen.c b/sysdeps/s390/multiarch/wcsnlen.c
new file mode 100644
index 0000000000..bf2fd6364a
--- /dev/null
+++ b/sysdeps/s390/multiarch/wcsnlen.c
@@ -0,0 +1,28 @@
+/* Multiple versions of wcsnlen.
+   Copyright (C) 2015 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/>.  */
+
+#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
+# include <wchar.h>
+# include <ifunc-resolve.h>
+
+s390_vx_libc_ifunc (__wcsnlen)
+weak_alias (__wcsnlen, wcsnlen)
+
+#else
+# include <wcsmbs/wcsnlen.c>
+#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */