[PATCH 10/27] S390: Optimize stpcpy and wcpcpy.

[Stefan Liebler <stli at linux dot vnet dot ibm dot com>]

This patch provides optimized versions of stpcpy and wcpcpy with the z13
vector instructions.

ChangeLog:

	* sysdeps/s390/multiarch/stpcpy-c.c: New File.
	* sysdeps/s390/multiarch/stpcpy-vx.S: Likewise.
	* sysdeps/s390/multiarch/stpcpy.c: Likewise.
	* sysdeps/s390/multiarch/wcpcpy-c.c: Likewise.
	* sysdeps/s390/multiarch/wcpcpy-vx.S: Likewise.
	* sysdeps/s390/multiarch/wcpcpy.c: Likewise.
	* sysdeps/s390/multiarch/Makefile (sysdep_routines): Add stpcpy and
	wcpcpy functions.
	* string/stpcpy.c: Use STPCPY if defined.
	* wcsmbs/wcpcpy.c: Use WCPCPY if defined.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Add ifunc test for stpcpy, wcpcpy.
	* string/test-stpcpy.c: Add wcpcpy support.
	* wcsmbs/test-wcpcpy.c: New File.
	* wcsmbs/Makefile (strop-tests): Add wcpcpy.
	* benchtests/bench-stpcpy.c: Add wcpcpy support.
	* benchtests/bench-wcpcpy.c: New File.
	* benchtests/Makefile (wcsmbs-bench): Add wcpcpy.
---
 benchtests/Makefile                      |   2 +-
 benchtests/bench-stpcpy.c                |  33 +++++++---
 benchtests/bench-wcpcpy.c                |  20 ++++++
 string/stpcpy.c                          |   6 ++
 string/test-stpcpy.c                     |  35 +++++++---
 sysdeps/s390/multiarch/Makefile          |   6 +-
 sysdeps/s390/multiarch/ifunc-impl-list.c |   3 +
 sysdeps/s390/multiarch/stpcpy-c.c        |  34 ++++++++++
 sysdeps/s390/multiarch/stpcpy-vx.S       | 100 ++++++++++++++++++++++++++++
 sysdeps/s390/multiarch/stpcpy.c          |  30 +++++++++
 sysdeps/s390/multiarch/wcpcpy-c.c        |  25 +++++++
 sysdeps/s390/multiarch/wcpcpy-vx.S       | 108 +++++++++++++++++++++++++++++++
 sysdeps/s390/multiarch/wcpcpy.c          |  28 ++++++++
 wcsmbs/Makefile                          |   3 +-
 wcsmbs/test-wcpcpy.c                     |  20 ++++++
 wcsmbs/wcpcpy.c                          |   6 +-
 16 files changed, 435 insertions(+), 24 deletions(-)
 create mode 100644 benchtests/bench-wcpcpy.c
 create mode 100644 sysdeps/s390/multiarch/stpcpy-c.c
 create mode 100644 sysdeps/s390/multiarch/stpcpy-vx.S
 create mode 100644 sysdeps/s390/multiarch/stpcpy.c
 create mode 100644 sysdeps/s390/multiarch/wcpcpy-c.c
 create mode 100644 sysdeps/s390/multiarch/wcpcpy-vx.S
 create mode 100644 sysdeps/s390/multiarch/wcpcpy.c
 create mode 100644 wcsmbs/test-wcpcpy.c

diff --git a/benchtests/Makefile b/benchtests/Makefile
index 28892c8..bf1f6dc 100644
--- a/benchtests/Makefile
+++ b/benchtests/Makefile
@@ -36,7 +36,7 @@ string-bench := bcopy bzero memccpy memchr memcmp memcpy memmem memmove \
 		strncasecmp strncat strncmp strncpy strnlen strpbrk strrchr \
 		strspn strstr strcpy_chk stpcpy_chk memrchr strsep strtok \
 		strcoll
-wcsmbs-bench := wcslen wcsnlen wcscpy
+wcsmbs-bench := wcslen wcsnlen wcscpy wcpcpy
 string-bench-all := $(string-bench) ${wcsmbs-bench}
 
 # We have to generate locales
diff --git a/benchtests/bench-stpcpy.c b/benchtests/bench-stpcpy.c
index 3d79432..843e6a9 100644
--- a/benchtests/bench-stpcpy.c
+++ b/benchtests/bench-stpcpy.c
@@ -18,19 +18,34 @@
 
 #define STRCPY_RESULT(dst, len) ((dst) + (len))
 #define TEST_MAIN
-#define TEST_NAME "stpcpy"
+#ifndef WIDE
+# define TEST_NAME "stpcpy"
+#else
+# define TEST_NAME "wcpcpy"
+#endif /* WIDE */
 #include "bench-string.h"
-
-char *simple_stpcpy (char *, const char *);
-
-IMPL (simple_stpcpy, 0)
-IMPL (stpcpy, 1)
-
-char *
-simple_stpcpy (char *dst, const char *src)
+#ifndef WIDE
+# define CHAR char
+# define SIMPLE_STPCPY simple_stpcpy
+# define STPCPY stpcpy
+#else
+# include <wchar.h>
+# define CHAR wchar_t
+# define SIMPLE_STPCPY simple_wcpcpy
+# define STPCPY wcpcpy
+#endif /* WIDE */
+
+CHAR *SIMPLE_STPCPY (CHAR *, const CHAR *);
+
+IMPL (SIMPLE_STPCPY, 0)
+IMPL (STPCPY, 1)
+
+CHAR *
+SIMPLE_STPCPY (CHAR *dst, const CHAR *src)
 {
   while ((*dst++ = *src++) != '\0');
   return dst - 1;
 }
 
+#undef CHAR
 #include "bench-strcpy.c"
diff --git a/benchtests/bench-wcpcpy.c b/benchtests/bench-wcpcpy.c
new file mode 100644
index 0000000..cfbfccf
--- /dev/null
+++ b/benchtests/bench-wcpcpy.c
@@ -0,0 +1,20 @@
+/* Measure wcpcpy 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-stpcpy.c"
diff --git a/string/stpcpy.c b/string/stpcpy.c
index ecfb8d9..8d7b3fe 100644
--- a/string/stpcpy.c
+++ b/string/stpcpy.c
@@ -29,6 +29,12 @@
 # define __stpcpy stpcpy
 #endif
 
+#ifdef STPCPY
+extern __typeof (__stpcpy) STPCPY;
+# undef __stpcpy
+# define __stpcpy STPCPY
+#endif
+
 /* Copy SRC to DEST, returning the address of the terminating '\0' in DEST.  */
 char *
 __stpcpy (dest, src)
diff --git a/string/test-stpcpy.c b/string/test-stpcpy.c
index 3d138d9..7336834 100644
--- a/string/test-stpcpy.c
+++ b/string/test-stpcpy.c
@@ -1,4 +1,4 @@
-/* Test and measure stpcpy functions.
+/* Test stpcpy functions.
    Copyright (C) 1999-2015 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Written by Jakub Jelinek <jakub@redhat.com>, 1999.
@@ -19,19 +19,34 @@
 
 #define STRCPY_RESULT(dst, len) ((dst) + (len))
 #define TEST_MAIN
-#define TEST_NAME "stpcpy"
+#ifndef WIDE
+# define TEST_NAME "stpcpy"
+#else
+# define TEST_NAME "wcpcpy"
+#endif /* !WIDE */
 #include "test-string.h"
-
-char *simple_stpcpy (char *, const char *);
-
-IMPL (simple_stpcpy, 0)
-IMPL (stpcpy, 1)
-
-char *
-simple_stpcpy (char *dst, const char *src)
+#ifndef WIDE
+# define CHAR char
+# define SIMPLE_STPCPY simple_stpcpy
+# define STPCPY stpcpy
+#else
+# include <wchar.h>
+# define CHAR wchar_t
+# define SIMPLE_STPCPY simple_wcpcpy
+# define STPCPY wcpcpy
+#endif /* !WIDE */
+
+CHAR *SIMPLE_STPCPY (CHAR *, const CHAR *);
+
+IMPL (SIMPLE_STPCPY, 0)
+IMPL (STPCPY, 1)
+
+CHAR *
+SIMPLE_STPCPY (CHAR *dst, const CHAR *src)
 {
   while ((*dst++ = *src++) != '\0');
   return dst - 1;
 }
 
+#undef CHAR
 #include "test-strcpy.c"
diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
index e2202b7..5b57342 100644
--- a/sysdeps/s390/multiarch/Makefile
+++ b/sysdeps/s390/multiarch/Makefile
@@ -1,11 +1,13 @@
 ifeq ($(subdir),string)
 sysdep_routines += strlen strlen-vx strlen-c \
 		   strnlen strnlen-vx strnlen-c \
-		   strcpy strcpy-vx
+		   strcpy strcpy-vx \
+		   stpcpy stpcpy-vx stpcpy-c
 endif
 
 ifeq ($(subdir),wcsmbs)
 sysdep_routines += wcslen wcslen-vx wcslen-c \
 		   wcsnlen wcsnlen-vx wcsnlen-c \
-		   wcscpy wcscpy-vx wcscpy-c
+		   wcscpy wcscpy-vx wcscpy-c \
+		   wcpcpy wcpcpy-vx wcpcpy-c
 endif
diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
index c9228d6..a402301 100644
--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
@@ -88,6 +88,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
   IFUNC_VX_IMPL (strcpy);
   IFUNC_VX_IMPL (wcscpy);
 
+  IFUNC_VX_IMPL (stpcpy);
+  IFUNC_VX_IMPL (wcpcpy);
+
 #endif /* HAVE_S390_VX_ASM_SUPPORT */
 
   return i;
diff --git a/sysdeps/s390/multiarch/stpcpy-c.c b/sysdeps/s390/multiarch/stpcpy-c.c
new file mode 100644
index 0000000..7d40751
--- /dev/null
+++ b/sysdeps/s390/multiarch/stpcpy-c.c
@@ -0,0 +1,34 @@
+/* Default stpcpy 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 STPCPY  __stpcpy_c
+# undef libc_hidden_def
+# undef weak_alias
+# undef libc_hidden_builtin_def
+# ifdef SHARED
+#  define libc_hidden_def(name)					\
+  __hidden_ver1 (__stpcpy_c, __GI___stpcpy, __stpcpy_c);
+#  define libc_hidden_builtin_def(name)				\
+  strong_alias (__stpcpy_c, __stpcpy_c_1);			\
+  __hidden_ver1 (__stpcpy_c_1, __GI_stpcpy, __stpcpy_c_1);
+# endif /* SHARED */
+
+
+# include <string/stpcpy.c>
+#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
diff --git a/sysdeps/s390/multiarch/stpcpy-vx.S b/sysdeps/s390/multiarch/stpcpy-vx.S
new file mode 100644
index 0000000..44799c4
--- /dev/null
+++ b/sysdeps/s390/multiarch/stpcpy-vx.S
@@ -0,0 +1,100 @@
+/* Vector optimized 32/64 bit S/390 version of stpcpy.
+   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 * stpcpy (const char *dest, const char *src)
+   Copy string src to dest returning a pointer to its end.
+
+   Register usage:
+   -r1=tmp
+   -r2=dest and return value
+   -r3=src
+   -r4=tmp
+   -r5=current_len
+   -v16=part of src
+   -v17=index of zero
+   -v18=part of src
+*/
+ENTRY(__stpcpy_vx)
+	.machine "z13"
+	.machinemode "zarch_nohighgprs"
+
+	vlbb	%v16,0(%r3),6	/* Load s until next 4k-byte boundary.  */
+	lcbb	%r1,0(%r3),6	/* Get bytes to 4k-byte boundary or 16.  */
+
+	vfenezb	%v17,%v16,%v16	/* Find element not equal with zero search.  */
+	vlgvb	%r5,%v17,7	/* Load zero index or 16 if not found.  */
+	clrjl	%r5,%r1,.Lfound_align /* If found zero within loaded bytes,
+					 copy bytes before and return.  */
+
+	/* Align s to 16 byte.  */
+	risbgn	%r4,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
+	lghi	%r5,15		/* current_len = 15.  */
+	slr	%r5,%r4		/* Compute highest index to 16byte boundary.  */
+
+	vstl	%v16,%r5,0(%r2)	/* Copy loaded characters - no zero.  */
+	ahi	%r5,1		/* Start loop at next character.  */
+
+	j	.Lloop1
+
+.Lfound_align:
+	vstl	%v16,%r5,0(%r2)	/* Copy characters including zero.  */
+	la	%r2,0(%r5,%r2)	/* Return pointer to zero.  */
+	br	%r14
+
+	/* Find zero in 16byte aligned loop.  */
+.Lloop2:
+	vst	%v18,0(%r5,%r2)	/* Store previous part without zero to dst.  */
+	aghi	%r5,16
+.Lloop1:
+	vl	%v16,0(%r5,%r3)	/* Load s.  */
+	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)	/* Store previous part without zero to dst.  */
+	aghi	%r5,16
+	vfenezbs %v17,%v18,%v18
+	je	.Lfound_v18
+	vl	%v16,16(%r5,%r3)
+	vst	%v18,0(%r5,%r2)
+	aghi	%r5,16
+	vfenezbs %v17,%v16,%v16
+	je	.Lfound_v16
+	vl	%v18,16(%r5,%r3)
+	vst	%v16,0(%r5,%r2)
+	aghi	%r5,16
+	vfenezbs %v17,%v18,%v18
+	jo	.Lloop2		/* No zero found -> loop.  */
+
+.Lfound_v18:
+	vlr	%v16,%v18
+.Lfound_v16:
+	la	%r3,0(%r5,%r2)
+	vlgvb	%r1,%v17,7	/* Load byte index of zero.  */
+	vstl	%v16,%r1,0(%r3)	/* Copy characters including zero.  */
+	algr	%r5,%r1
+	la	%r2,0(%r5,%r2)	/* Return pointer to zero.  */
+	br	%r14
+END(__stpcpy_vx)
+#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
diff --git a/sysdeps/s390/multiarch/stpcpy.c b/sysdeps/s390/multiarch/stpcpy.c
new file mode 100644
index 0000000..7c65c02
--- /dev/null
+++ b/sysdeps/s390/multiarch/stpcpy.c
@@ -0,0 +1,30 @@
+/* Multiple versions of stpcpy.
+   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 NO_MEMPCPY_STPCPY_REDIRECT
+# include <string.h>
+# include <ifunc-resolve.h>
+
+s390_vx_libc_ifunc (__stpcpy)
+weak_alias (__stpcpy, stpcpy)
+libc_hidden_builtin_def (stpcpy)
+
+#else
+# include <string/stpcpy.c>
+#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
diff --git a/sysdeps/s390/multiarch/wcpcpy-c.c b/sysdeps/s390/multiarch/wcpcpy-c.c
new file mode 100644
index 0000000..e5a58e4
--- /dev/null
+++ b/sysdeps/s390/multiarch/wcpcpy-c.c
@@ -0,0 +1,25 @@
+/* Default wcslen 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 WCPCPY  __wcpcpy_c
+
+# include <wchar.h>
+extern __typeof (__wcpcpy) __wcpcpy_c;
+# include <wcsmbs/wcpcpy.c>
+#endif
diff --git a/sysdeps/s390/multiarch/wcpcpy-vx.S b/sysdeps/s390/multiarch/wcpcpy-vx.S
new file mode 100644
index 0000000..d56034d
--- /dev/null
+++ b/sysdeps/s390/multiarch/wcpcpy-vx.S
@@ -0,0 +1,108 @@
+/* Vector optimized 32/64 bit S/390 version of wcpcpy.
+   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 * wcpcpy (const wchar_t *dest, const wchar_t *src)
+   Copy string src to dest returning a pointer to its end.
+
+   Register usage:
+   -r0=border-len for switching to vector-instructions
+   -r1=tmp
+   -r2=dest and return value
+   -r3=src
+   -r4=tmp
+   -r5=current_len
+   -v16=part of src
+   -v17=index of zero
+   -v18=part of src
+*/
+ENTRY(__wcpcpy_vx)
+	.machine "z13"
+	.machinemode "zarch_nohighgprs"
+
+	vlbb	%v16,0(%r3),6	/* Load s until next 4k-byte boundary.  */
+	lcbb	%r1,0(%r3),6	/* Get bytes to 4k-byte boundary or 16.  */
+
+	tmll	%r3,3		/* Test if s is 4-byte aligned?  */
+	jne	.Lfallback	/* And use common-code variant if not.  */
+
+	vfenezf	%v17,%v16,%v16	/* Find element not equal with zero search.  */
+	vlgvb	%r5,%v17,7	/* Load zero index or 16 if not found.  */
+	clrjl	%r5,%r1,.Lfound_align /* If found zero within loaded bytes,
+					 copy bytes before and return.  */
+
+	/* Align s to 16 byte.  */
+	risbgn	%r4,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
+	lghi	%r5,15		/* current_len = 15.  */
+	slr	%r5,%r4		/* Compute highest index to 16byte boundary.  */
+
+	vstl	%v16,%r5,0(%r2)	/* Copy loaded characters - no zero.  */
+	ahi	%r5,1		/* Start loop at next character.  */
+
+	j	.Lloop1
+
+	.Lfound_align:
+	aghi	%r5,3		/* Also copy remaining bytes of zero.  */
+	vstl	%v16,%r5,0(%r2)	/* Copy characters including zero.  */
+	lay	%r2,-3(%r5,%r2)	/* Return pointer to zero.  */
+	br	%r14
+
+	/* Find zero in 16byte aligned loop.  */
+.Lloop2:
+	vst	%v18,0(%r5,%r2)	/* Store previous part without zero to dst.  */
+	aghi	%r5,16
+.Lloop1:
+	vl	%v16,0(%r5,%r3)	/* Load s.  */
+	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
+	vfenezfs %v17,%v18,%v18
+	je	.Lfound_v18
+	vl	%v16,16(%r5,%r3)
+	vst	%v18,0(%r5,%r2)
+	aghi	%r5,16
+	vfenezfs %v17,%v16,%v16
+	je	.Lfound_v16
+	vl	%v18,16(%r5,%r3)
+	vst	%v16,0(%r5,%r2)
+	aghi	%r5,16
+	vfenezfs %v17,%v18,%v18
+	jo	.Lloop2		/* No zero found -> loop.  */
+
+.Lfound_v18:
+	vlr	%v16,%v18
+.Lfound_v16:
+	la	%r3,0(%r5,%r2)
+	vlgvb	%r1,%v17,7	/* Load byte index of zero.  */
+	aghi	%r1,3		/* Also copy remaining bytes of zero.  */
+	vstl	%v16,%r1,0(%r3)	/* Copy characters including zero.  */
+	algr	%r5,%r1
+	lay	%r2,-3(%r5,%r2)	/* Return pointer to zero.  */
+	br	%r14
+.Lfallback:
+	jg	__wcpcpy_c
+END(__wcpcpy_vx)
+#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
diff --git a/sysdeps/s390/multiarch/wcpcpy.c b/sysdeps/s390/multiarch/wcpcpy.c
new file mode 100644
index 0000000..53c4444
--- /dev/null
+++ b/sysdeps/s390/multiarch/wcpcpy.c
@@ -0,0 +1,28 @@
+/* Multiple versions of wcpcpy.
+   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 (__wcpcpy)
+weak_alias (__wcpcpy, wcpcpy)
+
+#else
+# include <wcsmbs/wcpcpy.c>
+#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
diff --git a/wcsmbs/Makefile b/wcsmbs/Makefile
index 3858d74..1112e05 100644
--- a/wcsmbs/Makefile
+++ b/wcsmbs/Makefile
@@ -42,7 +42,8 @@ routines := wcscat wcschr wcscmp wcscpy wcscspn wcsdup wcslen wcsncat \
 	    isoc99_swscanf isoc99_vswscanf \
 	    mbrtoc16 c16rtomb
 
-strop-tests :=  wcscmp wcsncmp wmemcmp wcslen wcschr wcsrchr wcscpy wcsnlen
+strop-tests :=  wcscmp wcsncmp wmemcmp wcslen wcschr wcsrchr wcscpy wcsnlen \
+		wcpcpy
 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))
diff --git a/wcsmbs/test-wcpcpy.c b/wcsmbs/test-wcpcpy.c
new file mode 100644
index 0000000..2cf91a1
--- /dev/null
+++ b/wcsmbs/test-wcpcpy.c
@@ -0,0 +1,20 @@
+/* Test wcspcpy 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-stpcpy.c"
diff --git a/wcsmbs/wcpcpy.c b/wcsmbs/wcpcpy.c
index 1c05bca..0c8ded3 100644
--- a/wcsmbs/wcpcpy.c
+++ b/wcsmbs/wcpcpy.c
@@ -21,7 +21,9 @@
 #define __need_ptrdiff_t
 #include <stddef.h>
 
-
+#ifdef WCPCPY
+# define __wcpcpy WCPCPY
+#endif
 /* Copy SRC to DEST, returning the address of the terminating L'\0' in
    DEST.  */
 wchar_t *
@@ -43,4 +45,6 @@ __wcpcpy (dest, src)
   return wcp;
 }
 
+#ifndef WCPCPY
 weak_alias (__wcpcpy, wcpcpy)
+#endif
-- 
1.8.4.2