File 0015-S390-Optimize-stpncpy-and-wcpncpy.patch of Package glibc.i686

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File 0015-S390-Optimize-stpncpy-and-wcpncpy.patch of Package glibc.i686 (Revision 986e0707e7fe6170d2a129fd3494aaa1)

Currently displaying revision 986e0707e7fe6170d2a129fd3494aaa1 , Show latest

2015-08-26  Stefan Liebler  <stli@linux.vnet.ibm.com>

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

Index: glibc-2.22/benchtests/Makefile
===================================================================
--- glibc-2.22.orig/benchtests/Makefile
+++ glibc-2.22/benchtests/Makefile
@@ -36,7 +36,7 @@ string-bench := bcopy bzero memccpy memc
 		strncasecmp strncat strncmp strncpy strnlen strpbrk strrchr \
 		strspn strstr strcpy_chk stpcpy_chk memrchr strsep strtok \
 		strcoll
-wcsmbs-bench := wcslen wcsnlen wcscpy wcpcpy wcsncpy
+wcsmbs-bench := wcslen wcsnlen wcscpy wcpcpy wcsncpy wcpncpy
 string-bench-all := $(string-bench) ${wcsmbs-bench}
 
 # We have to generate locales
Index: glibc-2.22/benchtests/bench-stpncpy.c
===================================================================
--- glibc-2.22.orig/benchtests/bench-stpncpy.c
+++ glibc-2.22/benchtests/bench-stpncpy.c
@@ -18,18 +18,36 @@
 
 #define STRNCPY_RESULT(dst, len, n) ((dst) + ((len) > (n) ? (n) : (len)))
 #define TEST_MAIN
-#define TEST_NAME "stpncpy"
+#ifndef WIDE
+# define TEST_NAME "stpncpy"
+#else
+# define TEST_NAME "wcpncpy"
+#endif /* WIDE */
 #include "bench-string.h"
+#ifndef WIDE
+# define CHAR char
+# define SIMPLE_STPNCPY simple_stpncpy
+# define STUPID_STPNCPY stupid_stpncpy
+# define STPNCPY stpncpy
+# define STRNLEN strnlen
+#else
+# include <wchar.h>
+# define CHAR wchar_t
+# define SIMPLE_STPNCPY simple_wcpncpy
+# define STUPID_STPNCPY stupid_wcpncpy
+# define STPNCPY wcpncpy
+# define STRNLEN wcsnlen
+#endif /* WIDE */
+
+CHAR *SIMPLE_STPNCPY (CHAR *, const CHAR *, size_t);
+CHAR *STUPID_STPNCPY (CHAR *, const CHAR *, size_t);
+
+IMPL (STUPID_STPNCPY, 0)
+IMPL (SIMPLE_STPNCPY, 0)
+IMPL (STPNCPY, 1)
 
-char *simple_stpncpy (char *, const char *, size_t);
-char *stupid_stpncpy (char *, const char *, size_t);
-
-IMPL (stupid_stpncpy, 0)
-IMPL (simple_stpncpy, 0)
-IMPL (stpncpy, 1)
-
-char *
-simple_stpncpy (char *dst, const char *src, size_t n)
+CHAR *
+SIMPLE_STPNCPY (CHAR *dst, const CHAR *src, size_t n)
 {
   while (n--)
     if ((*dst++ = *src++) == '\0')
@@ -43,10 +61,10 @@ simple_stpncpy (char *dst, const char *s
   return dst;
 }
 
-char *
-stupid_stpncpy (char *dst, const char *src, size_t n)
+CHAR *
+STUPID_STPNCPY (CHAR *dst, const CHAR *src, size_t n)
 {
-  size_t nc = strnlen (src, n);
+  size_t nc = STRNLEN (src, n);
   size_t i;
 
   for (i = 0; i < nc; ++i)
@@ -56,4 +74,5 @@ stupid_stpncpy (char *dst, const char *s
   return dst + nc;
 }
 
+#undef CHAR
 #include "bench-strncpy.c"
Index: glibc-2.22/benchtests/bench-wcpncpy.c
===================================================================
--- /dev/null
+++ glibc-2.22/benchtests/bench-wcpncpy.c
@@ -0,0 +1,20 @@
+/* Measure wcpncpy functions.
+   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/>.  */
+
+#define WIDE 1
+#include "bench-stpncpy.c"
Index: glibc-2.22/string/test-stpncpy.c
===================================================================
--- glibc-2.22.orig/string/test-stpncpy.c
+++ glibc-2.22/string/test-stpncpy.c
@@ -19,18 +19,36 @@
 
 #define STRNCPY_RESULT(dst, len, n) ((dst) + ((len) > (n) ? (n) : (len)))
 #define TEST_MAIN
-#define TEST_NAME "stpncpy"
+#ifndef WIDE
+# define TEST_NAME "stpncpy"
+#else
+# define TEST_NAME "wcpncpy"
+#endif /* WIDE */
 #include "test-string.h"
+#ifndef WIDE
+# define CHAR char
+# define SIMPLE_STPNCPY simple_stpncpy
+# define STUPID_STPNCPY stupid_stpncpy
+# define STPNCPY stpncpy
+# define STRNLEN strnlen
+#else
+# include <wchar.h>
+# define CHAR wchar_t
+# define SIMPLE_STPNCPY simple_wcpncpy
+# define STUPID_STPNCPY stupid_wcpncpy
+# define STPNCPY wcpncpy
+# define STRNLEN wcsnlen
+#endif /* WIDE */
+
+CHAR *SIMPLE_STPNCPY (CHAR *, const CHAR *, size_t);
+CHAR *STUPID_STPNCPY (CHAR *, const CHAR *, size_t);
+
+IMPL (STUPID_STPNCPY, 0)
+IMPL (SIMPLE_STPNCPY, 0)
+IMPL (STPNCPY, 1)
 
-char *simple_stpncpy (char *, const char *, size_t);
-char *stupid_stpncpy (char *, const char *, size_t);
-
-IMPL (stupid_stpncpy, 0)
-IMPL (simple_stpncpy, 0)
-IMPL (stpncpy, 1)
-
-char *
-simple_stpncpy (char *dst, const char *src, size_t n)
+CHAR *
+SIMPLE_STPNCPY (CHAR *dst, const CHAR *src, size_t n)
 {
   while (n--)
     if ((*dst++ = *src++) == '\0')
@@ -44,10 +62,10 @@ simple_stpncpy (char *dst, const char *s
   return dst;
 }
 
-char *
-stupid_stpncpy (char *dst, const char *src, size_t n)
+CHAR *
+STUPID_STPNCPY (CHAR *dst, const CHAR *src, size_t n)
 {
-  size_t nc = strnlen (src, n);
+  size_t nc = STRNLEN (src, n);
   size_t i;
 
   for (i = 0; i < nc; ++i)
@@ -57,4 +75,5 @@ stupid_stpncpy (char *dst, const char *s
   return dst + nc;
 }
 
+#undef CHAR
 #include "test-strncpy.c"
Index: glibc-2.22/sysdeps/s390/multiarch/Makefile
===================================================================
--- glibc-2.22.orig/sysdeps/s390/multiarch/Makefile
+++ glibc-2.22/sysdeps/s390/multiarch/Makefile
@@ -3,7 +3,8 @@ sysdep_routines += strlen strlen-vx strl
 		   strnlen strnlen-vx strnlen-c \
 		   strcpy strcpy-vx \
 		   stpcpy stpcpy-vx stpcpy-c \
-		   strncpy strncpy-vx
+		   strncpy strncpy-vx \
+		   stpncpy stpncpy-vx stpncpy-c
 endif
 
 ifeq ($(subdir),wcsmbs)
@@ -11,5 +12,6 @@ sysdep_routines += wcslen wcslen-vx wcsl
 		   wcsnlen wcsnlen-vx wcsnlen-c \
 		   wcscpy wcscpy-vx wcscpy-c \
 		   wcpcpy wcpcpy-vx wcpcpy-c \
-		   wcsncpy wcsncpy-vx wcsncpy-c
+		   wcsncpy wcsncpy-vx wcsncpy-c \
+		   wcpncpy wcpncpy-vx wcpncpy-c
 endif
Index: glibc-2.22/sysdeps/s390/multiarch/ifunc-impl-list.c
===================================================================
--- glibc-2.22.orig/sysdeps/s390/multiarch/ifunc-impl-list.c
+++ glibc-2.22/sysdeps/s390/multiarch/ifunc-impl-list.c
@@ -94,6 +94,9 @@ __libc_ifunc_impl_list (const char *name
   IFUNC_VX_IMPL (strncpy);
   IFUNC_VX_IMPL (wcsncpy);
 
+  IFUNC_VX_IMPL (stpncpy);
+  IFUNC_VX_IMPL (wcpncpy);
+
 #endif /* HAVE_S390_VX_ASM_SUPPORT */
 
   return i;
Index: glibc-2.22/sysdeps/s390/multiarch/stpncpy-c.c
===================================================================
--- /dev/null
+++ glibc-2.22/sysdeps/s390/multiarch/stpncpy-c.c
@@ -0,0 +1,28 @@
+/* Default stpncpy 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 STPNCPY  __stpncpy_c
+# ifdef SHARED
+#  undef libc_hidden_def
+#  define libc_hidden_def(name)  \
+     __hidden_ver1 (__stpncpy_c, __GI___stpncpy, __stpncpy_c);
+# endif /* SHARED */
+
+# include <string/stpncpy.c>
+#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
Index: glibc-2.22/sysdeps/s390/multiarch/stpncpy-vx.S
===================================================================
--- /dev/null
+++ glibc-2.22/sysdeps/s390/multiarch/stpncpy-vx.S
@@ -0,0 +1,200 @@
+/* Vector optimized 32/64 bit S/390 version of stpncpy.
+   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
+
+/* char * stpncpy (char *dest, const char *src, size_t n)
+   Copies at most n characters of string src to dest
+   returning a pointer to its end or dest+n
+   if src is smaller than n.
+
+   Register usage:
+   -%r0 = return value
+   -%r1 = zero byte index
+   -%r2 = curr dst pointer
+   -%r3 = curr src pointer
+   -%r4 = n
+   -%r5 = current_len
+   -%r6 = loaded bytes
+   -%r7 = border, tmp
+*/
+ENTRY(__stpncpy_vx)
+	.machine "z13"
+	.machinemode "zarch_nohighgprs"
+
+# if !defined __s390x__
+	llgfr	%r4,%r4
+# endif /* !defined __s390x__ */
+
+	clgfi	%r4,0
+	ber	%r14		/* Nothing to do, if n == 0.  */
+
+	la	%r0,0(%r4,%r2)	/* Save destination pointer + n for return.  */
+	vlvgp	%v31,%r6,%r7	/* Save registers.  */
+
+	vlbb	%v16,0(%r3),6	/* Load s until next 4k-byte boundary.  */
+	lcbb	%r6,0(%r3),6	/* Get bytes to 4k-byte boundary or 16.  */
+	llgfr	%r6,%r6		/* Convert 32bit to 64bit.  */
+
+	lghi	%r5,0		/* current_len = 0.  */
+
+	clgrjle	%r4,%r6,.Lremaining_v16 /* If n <= loaded-bytes
+					   -> process remaining.  */
+
+	/* n > loaded-byte-count */
+	vfenezb	%v17,%v16,%v16	/* Find element not equal with zero search.  */
+	vlgvb	%r1,%v17,7	/* Load zero index or 16 if not found.  */
+	clrjl	%r1,%r6,.Lfound_v16_store /* Found zero within loaded bytes,
+					     copy and return.  */
+
+	/* Align s to 16 byte.  */
+	risbgn	%r7,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
+	lghi	%r5,15		/* current_len = 15.  */
+	slr	%r5,%r7		/* Compute highest index to 16byte boundary.  */
+
+	/* Zero not found and n > loaded-byte-count.  */
+	vstl	%v16,%r5,0(%r2)	/* Copy loaded characters - no zero.  */
+	ahi	%r5,1		/* Start loop at next character.  */
+
+	/* Now we are 16byte aligned, so we can load a full vreg
+	   without page fault.  */
+	lgr	%r1,%r5		/* If %r5 + 64 < maxlen? -> loop64.  */
+	aghi	%r1,64
+	clgrjl	%r1,%r4,.Lloop64
+
+	vl	%v16,0(%r5,%r3)	/* Load s.  */
+	clgijl	%r4,17,.Lremaining_v16	/* If n <= 16, process remaining
+					   bytes.  */
+.Llt64:
+	lgr	%r7,%r4
+	slgfi	%r7,16		/* border_len = n - 16.  */
+
+	clgrjhe	%r5,%r7,.Lremaining_v16 /* If current_len >= border
+					   then process remaining bytes.  */
+	vfenezbs %v17,%v16,%v16	/* Find element not equal with zero search.  */
+	je	.Lfound_v16	/* Jump away if zero was found.  */
+	vl	%v18,16(%r5,%r3) /* Load next part of s.  */
+	vst	%v16,0(%r5,%r2)	/* Save previous part without zero to dst.  */
+	aghi	%r5,16
+
+	clgrjhe	%r5,%r7,.Lremaining_v18
+	vfenezbs %v17,%v18,%v18
+	je	.Lfound_v18
+	vl	%v16,16(%r5,%r3)
+	vst	%v18,0(%r5,%r2)
+	aghi	%r5,16
+
+	clgrjhe	%r5,%r7,.Lremaining_v16
+	vfenezbs %v17,%v16,%v16
+	je	.Lfound_v16
+	vl	%v18,16(%r5,%r3)
+	vst	%v16,0(%r5,%r2)
+	aghi	%r5,16
+
+.Lremaining_v18:
+	vlr	%v16,%v18
+.Lremaining_v16:
+	/* v16 contains the remaining bytes [1...16].
+	   Store remaining bytes and append string-termination.  */
+	vfenezb	%v17,%v16,%v16	/* Find element not equal with zero search.  */
+	slgrk	%r7,%r4,%r5	/* Remaining bytes = maxlen - current_len  */
+	aghi	%r7,-1		/* vstl needs highest index.  */
+	la	%r2,0(%r5,%r2)	/* vstl has no index register.  */
+	vlgvb	%r1,%v17,7	/* Load zero index or 16 if not found.  */
+	/* Zero in remaining bytes? -> jump away (zero-index <= max-index).  */
+	clrjle	%r1,%r7,.Lfound_v16_store
+	vstl	%v16,%r7,0(%r2)	/* Store remaining bytes without null
+				   termination!  */
+.Lend:
+	/* Restore saved registers.  */
+	vlgvg	%r6,%v31,0
+	vlgvg	%r7,%v31,1
+	lgr	%r2,%r0		/* Load saved dest-ptr.  */
+	br	%r14
+
+.Lfound_v16_32:
+	aghi	%r5,32
+	j	.Lfound_v16
+.Lfound_v18_48:
+	aghi	%r5,32
+.Lfound_v18_16:
+	aghi	%r5,16
+.Lfound_v18:
+	vlr	%v16,%v18
+.Lfound_v16:
+	/* v16 contains a zero. Store remaining bytes to zero. current_len
+	   has not reached border, thus checking for n is not needed!  */
+	vlgvb	%r1,%v17,7	/* Load byte index of zero.  */
+	la	%r2,0(%r5,%r2)	/* vstl has no support for index-register.  */
+.Lfound_v16_store:
+	vstl	%v16,%r1,0(%r2)	/* Copy characters including zero.  */
+	/* Fill remaining bytes with zero - remaining count always > 0.  */
+	algr	%r5,%r1		/* Remaining bytes (=%r4) = ...  */
+	slgr	%r4,%r5		/* = maxlen - (currlen + zero_index + 1) */
+	la	%r2,0(%r1,%r2)	/* Pointer to zero. start filling beyond.  */
+	lgr	%r0,%r2		/* Save return-pointer to found zero.  */
+	clgije	%r4,1,.Lend	/* Skip zero-filling, if found zero is last
+				   possible character.
+				   (1 is substracted from r4 below!).  */
+	aghi	%r4,-2		/* mvc with exrl needs count - 1.
+				   (additional -1, see remaining bytes above) */
+	srlg	%r6,%r4,8	/* Split into 256 byte blocks.  */
+	ltgr	%r6,%r6
+	je	.Lzero_lt256
+.Lzero_loop256:
+	mvc	1(256,%r2),0(%r2) /* Fill 256 zeros at once.  */
+	la	%r2,256(%r2)
+	brctg	%r6,.Lzero_loop256 /* Loop until all blocks are processed.  */
+.Lzero_lt256:
+	exrl	%r4,.Lmvc_lt256
+	j	.Lend
+.Lmvc_lt256:
+	mvc	1(1,%r2),0(%r2)
+
+.Lloop64:
+	vl	%v16,0(%r5,%r3)
+	vfenezbs %v17,%v16,%v16	/* Find element not equal with zero search.  */
+	je	.Lfound_v16	/* Jump away if zero was found.  */
+	vl	%v18,16(%r5,%r3) /* Load next part of s.  */
+	vst	%v16,0(%r5,%r2)	/* Save previous part without zero to dst.  */
+	vfenezbs %v17,%v18,%v18
+	je	.Lfound_v18_16
+	vl	%v16,32(%r5,%r3)
+	vst	%v18,16(%r5,%r2)
+	vfenezbs %v17,%v16,%v16
+	je	.Lfound_v16_32
+	vl	%v18,48(%r5,%r3)
+	vst	%v16,32(%r5,%r2)
+	vfenezbs %v17,%v18,%v18
+	je	.Lfound_v18_48
+	vst	%v18,48(%r5,%r2)
+
+	aghi	%r5,64
+	lgr	%r1,%r5		/* If %r5 + 64 < maxlen? -> loop64.  */
+	aghi	%r1,64
+	clgrjl	%r1,%r4,.Lloop64
+
+	vl	%v16,0(%r5,%r3)	/* Load s.  */
+	j	.Llt64
+END(__stpncpy_vx)
+#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
Index: glibc-2.22/sysdeps/s390/multiarch/stpncpy.c
===================================================================
--- /dev/null
+++ glibc-2.22/sysdeps/s390/multiarch/stpncpy.c
@@ -0,0 +1,28 @@
+/* Multiple versions of stpncpy.
+   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 (__stpncpy)
+weak_alias (__stpncpy, stpncpy)
+
+#else
+# include <string/stpncpy.c>
+#endif  /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
Index: glibc-2.22/sysdeps/s390/multiarch/wcpncpy-c.c
===================================================================
--- /dev/null
+++ glibc-2.22/sysdeps/s390/multiarch/wcpncpy-c.c
@@ -0,0 +1,25 @@
+/* Default wcsncpy 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 WCPNCPY  __wcpncpy_c
+
+# include <wchar.h>
+extern __typeof (__wcpncpy) __wcpncpy_c;
+# include <wcsmbs/wcpncpy.c>
+#endif
Index: glibc-2.22/sysdeps/s390/multiarch/wcpncpy-vx.S
===================================================================
--- /dev/null
+++ glibc-2.22/sysdeps/s390/multiarch/wcpncpy-vx.S
@@ -0,0 +1,222 @@
+/* Vector optimized 32/64 bit S/390 version of wcpncpy.
+   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
+
+/* wchar_t * wcpncpy (wchar_t *dest, const wchar_t *src, size_t n)
+   Copies at most n characters of string src to dest
+   returning a pointer to its end or dest+n
+   if src is smaller than n.
+
+   Register usage:
+   -%r0 = return value
+   -%r1 = zero byte index
+   -%r2 = curr dst pointer
+   -%r3 = curr src pointer
+   -%r4 = n
+   -%r5 = current_len
+   -%r6 = loaded bytes
+   -%r7 = border, tmp
+*/
+ENTRY(__wcpncpy_vx)
+	.machine "z13"
+	.machinemode "zarch_nohighgprs"
+
+# if !defined __s390x__
+	llgfr	%r4,%r4
+# endif /* !defined __s390x__ */
+
+	clgfi	%r4,0
+	ber	%r14		/* Nothing to do, if n == 0.  */
+
+	vlbb	%v16,0(%r3),6	/* Load s until next 4k-byte boundary.  */
+
+	tmll	%r3,3		/* Test if s is 4-byte aligned?  */
+	jne	.Lfallback	/* And use common-code variant if not.  */
+
+	vlvgp	%v31,%r6,%r7	/* Save registers.  */
+	lghi	%r5,0		/* current_len = 0.  */
+
+	lcbb	%r6,0(%r3),6	/* Get bytes to 4k-byte boundary or 16.  */
+	llgfr	%r6,%r6		/* Convert 32bit to 64bit.  */
+
+	/* Check range of maxlen and convert to byte-count.  */
+# ifdef __s390x__
+	tmhh	%r4,49152	/* Test bit 0 or 1 of maxlen.  */
+	lghi	%r1,-4		/* Max byte-count is 18446744073709551612.  */
+# else
+	tmlh	%r4,49152	/* Test bit 0 or 1 of maxlen.  */
+	llilf	%r1,4294967292	/* Max byte-count is 4294967292.  */
+# endif /* !__s390x__ */
+	sllg	%r4,%r4,2	/* Convert character-count to byte-count.  */
+	locgrne	%r4,%r1		/* Use max byte-count, if bit 0/1 was one.  */
+
+	la	%r0,0(%r4,%r2)	/* Save destination pointer + n for return.  */
+
+	clgrjle	%r4,%r6,.Lremaining_v16 /* If n <= loaded-bytes
+					   -> process remaining.  */
+
+	/* n > loaded-byte-count */
+	vfenezf	%v17,%v16,%v16	/* Find element not equal with zero search.  */
+	vlgvb	%r1,%v17,7	/* Load zero index or 16 if not found.  */
+	aghi	%r1,3		/* Also copy remaining bytes of zero.  */
+	clrjl	%r1,%r6,.Lfound_v16_store /* Found zero within loaded bytes,
+					     copy and return.  */
+
+	/* Align s to 16 byte.  */
+	risbgn	%r7,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
+	lghi	%r5,15		/* current_len = 15.  */
+	slr	%r5,%r7		/* Compute highest index to 16byte boundary.  */
+
+	/* Zero not found and n > loaded-byte-count.  */
+	vstl	%v16,%r5,0(%r2)	/* Copy loaded characters - no zero.  */
+	ahi	%r5,1		/* Start loop at next character.  */
+
+	/* Now we are 16byte aligned, so we can load a full vreg
+	   without page fault.  */
+	lgr	%r1,%r5		/* If %r5 + 64 < maxlen? -> loop64.  */
+	aghi	%r1,64
+	clgrjl	%r1,%r4,.Lloop64
+
+	vl	%v16,0(%r5,%r3)	/* Load s.  */
+	clgijl	%r4,17,.Lremaining_v16	/* If n <=16,
+					   process remaining bytes.  */
+.Llt64:
+	lgr	%r7,%r4
+	slgfi	%r7,16		/* border_len = n - 16.  */
+
+	clgrjhe	%r5,%r7,.Lremaining_v16 /* If current_len >= border
+					   then process remaining bytes.  */
+	vfenezfs %v17,%v16,%v16	/* Find element not equal with zero search.  */
+	je	.Lfound_v16	/* Jump away if zero was found.  */
+	vl	%v18,16(%r5,%r3) /* Load next part of s.  */
+	vst	%v16,0(%r5,%r2)	/* Store previous part without zero to dst.  */
+	aghi	%r5,16
+
+	clgrjhe	%r5,%r7,.Lremaining_v18
+	vfenezfs %v17,%v18,%v18
+	je	.Lfound_v18
+	vl	%v16,16(%r5,%r3)
+	vst	%v18,0(%r5,%r2)
+	aghi	%r5,16
+
+	clgrjhe	%r5,%r7,.Lremaining_v16
+	vfenezfs %v17,%v16,%v16
+	je	.Lfound_v16
+	vl	%v18,16(%r5,%r3)
+	vst	%v16,0(%r5,%r2)
+	aghi	%r5,16
+
+.Lremaining_v18:
+	vlr	%v16,%v18
+.Lremaining_v16:
+	/* v16 contains the remaining bytes [1...16].
+	   Store remaining bytes and append string-termination.  */
+	vfenezf	%v17,%v16,%v16	/* Find element not equal with zero search.  */
+	slgrk	%r7,%r4,%r5	/* Remaining bytes = maxlen - current_len  */
+	aghi	%r7,-1		/* vstl needs highest index.  */
+	la	%r2,0(%r5,%r2)	/* vstl has no index register.  */
+	vlgvb	%r1,%v17,7	/* Load zero index or 16 if not found.  */
+	aghi	%r1,3		/* Also copy remaining bytes of zero.  */
+	/* Zero in remaining bytes? -> jump away (zero-index <= max-index).  */
+	clrjle	%r1,%r7,.Lfound_v16_store
+	vstl	%v16,%r7,0(%r2)	/* Store remaining bytes without null
+				   termination!  */
+.Lend:
+	/* Restore saved registers.  */
+	vlgvg	%r6,%v31,0
+	vlgvg	%r7,%v31,1
+	lgr	%r2,%r0		/* Load saved dest-ptr.  */
+	br	%r14
+
+.Lfound_v16_32:
+	aghi	%r5,32
+	j	.Lfound_v16
+.Lfound_v18_48:
+	aghi	%r5,32
+.Lfound_v18_16:
+	aghi	%r5,16
+.Lfound_v18:
+	vlr	%v16,%v18
+.Lfound_v16:
+	/* v16 contains a zero. Store remaining bytes to zero. current_len
+	   has not reached border, thus checking for n is not needed!  */
+	vlgvb	%r1,%v17,7	/* Load byte index of zero.  */
+	la	%r2,0(%r5,%r2)	/* vstl has no support for index-register.  */
+	aghi	%r1,3		/* Also copy remaining bytes of zero.  */
+.Lfound_v16_store:
+	vstl	%v16,%r1,0(%r2)	/* Copy characters including zero.  */
+	/* Fill remaining bytes with zero - remaining byte count always > 0.  */
+	algr	%r5,%r1		/* Remaining bytes (=%r4) = ...  */
+	slgr	%r4,%r5		/* = n - (currlen + zero_index + 1) */
+	la	%r2,0(%r1,%r2)	/* Pointer to zero. start filling beyond.  */
+	lay	%r0,-3(%r2)	/* Save return-pointer to found zero.  */
+	clgije	%r4,1,.Lend	/* Skip zero-filling, if found-zero is last
+				   possible character.
+				   (1 is substracted from r4 below!).  */
+	aghi	%r4,-2		/* mvc with exrl needs count - 1.
+				   (additional -1, see remaining bytes above) */
+	srlg	%r6,%r4,8	/* Split into 256 byte blocks.  */
+	ltgr	%r6,%r6
+	je	.Lzero_lt256
+.Lzero_loop256:
+	mvc	1(256,%r2),0(%r2) /* Fill 256 zeros at once.  */
+	la	%r2,256(%r2)
+	brctg	%r6,.Lzero_loop256 /* Loop until all blocks are processed.  */
+.Lzero_lt256:
+	exrl	%r4,.Lmvc_lt256
+	j	.Lend
+.Lmvc_lt256:
+	mvc	1(1,%r2),0(%r2)
+
+	/* Find zero in 16byte aligned loop.  */
+.Lloop64:
+	vl	%v16,0(%r5,%r3)
+	vfenezfs %v17,%v16,%v16	/* Find element not equal with zero search.  */
+	je	.Lfound_v16	/* Jump away if zero was found.  */
+	vl	%v18,16(%r5,%r3) /* Load next part of s.  */
+	vst	%v16,0(%r5,%r2)	/* Store previous part without zero to dst.  */
+	vfenezfs %v17,%v18,%v18
+	je	.Lfound_v18_16
+	vl	%v16,32(%r5,%r3)
+	vst	%v18,16(%r5,%r2)
+	vfenezfs %v17,%v16,%v16
+	je	.Lfound_v16_32
+	vl	%v18,48(%r5,%r3)
+	vst	%v16,32(%r5,%r2)
+	vfenezfs %v17,%v18,%v18
+	je	.Lfound_v18_48
+	vst	%v18,48(%r5,%r2)
+
+	aghi	%r5,64
+	lgr	%r1,%r5		/* If %r5 + 64 < maxlen? -> loop64.  */
+	aghi	%r1,64
+	clgrjl	%r1,%r4,.Lloop64
+
+	vl	%v16,0(%r5,%r3)	/* Load s.  */
+	j	.Llt64
+
+.Lfallback:
+	jg	__wcpncpy_c
+END(__wcpncpy_vx)
+#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
Index: glibc-2.22/sysdeps/s390/multiarch/wcpncpy.c
===================================================================
--- /dev/null
+++ glibc-2.22/sysdeps/s390/multiarch/wcpncpy.c
@@ -0,0 +1,28 @@
+/* Multiple versions of wcpncpy.
+   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 (__wcpncpy)
+weak_alias (__wcpncpy, wcpncpy)
+
+#else
+# include <wcsmbs/wcpncpy.c>
+#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
Index: glibc-2.22/wcsmbs/Makefile
===================================================================
--- glibc-2.22.orig/wcsmbs/Makefile
+++ glibc-2.22/wcsmbs/Makefile
@@ -44,7 +44,7 @@ routines := wcscat wcschr wcscmp wcscpy
 	    mbrtoc16 c16rtomb
 
 strop-tests :=  wcscmp wcsncmp wmemcmp wcslen wcschr wcsrchr wcscpy wcsnlen \
-		wcpcpy wcsncpy
+		wcpcpy wcsncpy wcpncpy
 tests := tst-wcstof wcsmbs-tst1 tst-wcsnlen tst-btowc tst-mbrtowc \
 	 tst-wcrtomb tst-wcpncpy tst-mbsrtowcs tst-wchar-h tst-mbrtowc2 \
 	 tst-c16c32-1 wcsatcliff $(addprefix test-,$(strop-tests))
Index: glibc-2.22/wcsmbs/test-wcpncpy.c
===================================================================
--- /dev/null
+++ glibc-2.22/wcsmbs/test-wcpncpy.c
@@ -0,0 +1,20 @@
+/* Test wcpncpy functions.
+   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/>.  */
+
+#define WIDE 1
+#include "../string/test-stpncpy.c"
Index: glibc-2.22/wcsmbs/wcpncpy.c
===================================================================
--- glibc-2.22.orig/wcsmbs/wcpncpy.c
+++ glibc-2.22/wcsmbs/wcpncpy.c
@@ -18,6 +18,9 @@
 
 #include <wchar.h>
 
+#ifdef WCPNCPY
+# define __wcpncpy WCPNCPY
+#endif
 
 /* Copy no more than N wide-characters of SRC to DEST, returning the
    address of the last character written into DEST.  */
@@ -82,4 +85,6 @@ __wcpncpy (dest, src, n)
   return dest - 1;
 }
 
+#ifndef WCPNCPY
 weak_alias (__wcpncpy, wcpncpy)
+#endif

Places

File 0015-S390-Optimize-stpncpy-and-wcpncpy.patch of Package glibc.i686 (Revision 986e0707e7fe6170d2a129fd3494aaa1)

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