x86: Add evex optimized functions for the wchar_t strcpy family

Implemented:
    wcscat-evex  (+ 905 bytes)
    wcscpy-evex  (+ 674 bytes)
    wcpcpy-evex  (+ 709 bytes)
    wcsncpy-evex (+1358 bytes)
    wcpncpy-evex (+1467 bytes)
    wcsncat-evex (+1213 bytes)

Performance Changes:
    Times are from N = 10 runs of the benchmark suite and are reported
    as geometric mean of all ratios of New Implementation / Best Old
    Implementation. Best Old Implementation was determined with the
    highest ISA implementation.

    wcscat-evex     -> 0.991
    wcscpy-evex     -> 0.587
    wcpcpy-evex     -> 0.695
    wcsncpy-evex    -> 0.719
    wcpncpy-evex    -> 0.694
    wcsncat-evex    -> 0.979

Code Size Changes:
    This change  increase the size of libc.so by ~6.3kb bytes. For
    reference the patch optimizing the normal strcpy family functions
    decreases libc.so by ~5.7kb.

Full check passes on x86-64 and build succeeds for all ISA levels w/
and w/o multiarch.

33 files changed, 858 insertions, 7 deletions

diff --git a/sysdeps/x86_64/Makefile b/sysdeps/x86_64/Makefile
index 3627c56..688eb2d 100644
--- a/sysdeps/x86_64/Makefile
+++ b/sysdeps/x86_64/Makefile
@@ -188,8 +188,13 @@ endif
 ifeq ($(subdir),wcsmbs)
 
 sysdep_routines += \
+  wcpcpy-generic \
+  wcpncpy-generic \
+  wcscat-generic \
   wcscpy-generic \
+  wcsncat-generic \
   wcsncmp-generic \
+  wcsncpy-generic \
   wcsnlen-generic \
 # sysdep_routines
 
diff --git a/sysdeps/x86_64/multiarch/Makefile b/sysdeps/x86_64/multiarch/Makefile
index 066bfa4..d6e0194 100644
--- a/sysdeps/x86_64/multiarch/Makefile
+++ b/sysdeps/x86_64/multiarch/Makefile
@@ -131,6 +131,12 @@ endif
 
 ifeq ($(subdir),wcsmbs)
 sysdep_routines += \
+  wcpcpy-evex \
+  wcpcpy-generic \
+  wcpncpy-evex \
+  wcpncpy-generic \
+  wcscat-evex \
+  wcscat-generic \
   wcschr-avx2 \
   wcschr-avx2-rtm \
   wcschr-evex \
@@ -140,6 +146,8 @@ sysdep_routines += \
   wcscmp-avx2-rtm \
   wcscmp-evex \
   wcscmp-sse2 \
+  wcscpy-evex \
+  wcscpy-generic \
   wcscpy-ssse3 \
   wcslen-avx2 \
   wcslen-avx2-rtm \
@@ -147,9 +155,13 @@ sysdep_routines += \
   wcslen-evex512 \
   wcslen-sse2 \
   wcslen-sse4_1 \
+  wcsncat-evex \
+  wcsncat-generic \
   wcsncmp-avx2 \
   wcsncmp-avx2-rtm \
   wcsncmp-evex \
+  wcsncpy-evex \
+  wcsncpy-generic \
   wcsnlen-avx2 \
   wcsnlen-avx2-rtm \
   wcsnlen-evex \
@@ -163,8 +175,8 @@ sysdep_routines += \
   wmemchr-avx2 \
   wmemchr-avx2-rtm \
   wmemchr-evex \
-  wmemchr-evex512 \
   wmemchr-evex-rtm \
+  wmemchr-evex512 \
   wmemchr-sse2 \
   wmemcmp-avx2-movbe \
   wmemcmp-avx2-movbe-rtm \
diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
index 7cebee7..c908d6c 100644
--- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
@@ -901,16 +901,73 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 
   /* Support sysdeps/x86_64/multiarch/wcscpy.c.  */
   IFUNC_IMPL (i, name, wcscpy,
-	      /* ISA V4 wrapper for SSSE3 implementation because
-	         the SSSE3 implementation is also used at ISA
-	         level 3/4.  */
 	      X86_IFUNC_IMPL_ADD_V4 (array, i, wcscpy,
+				     (CPU_FEATURE_USABLE (AVX512VL)
+				      && CPU_FEATURE_USABLE (AVX512BW)
+				      && CPU_FEATURE_USABLE (BMI2)),
+				     __wcscpy_evex)
+	      X86_IFUNC_IMPL_ADD_V3 (array, i, wcscpy,
 				     CPU_FEATURE_USABLE (SSSE3),
 				     __wcscpy_ssse3)
 	      X86_IFUNC_IMPL_ADD_V1 (array, i, wcscpy,
 				     1,
 				     __wcscpy_generic))
 
+  /* Support sysdeps/x86_64/multiarch/wcsncpy.c.  */
+  IFUNC_IMPL (i, name, wcsncpy,
+	      X86_IFUNC_IMPL_ADD_V4 (array, i, wcsncpy,
+				     (CPU_FEATURE_USABLE (AVX512VL)
+				      && CPU_FEATURE_USABLE (AVX512BW)
+				      && CPU_FEATURE_USABLE (BMI2)),
+				     __wcsncpy_evex)
+	      X86_IFUNC_IMPL_ADD_V3 (array, i, wcpncpy,
+				     1,
+				     __wcsncpy_generic))
+
+  /* Support sysdeps/x86_64/multiarch/wcpcpy.c.  */
+  IFUNC_IMPL (i, name, wcpcpy,
+	      X86_IFUNC_IMPL_ADD_V4 (array, i, wcpcpy,
+				     (CPU_FEATURE_USABLE (AVX512VL)
+				      && CPU_FEATURE_USABLE (AVX512BW)
+				      && CPU_FEATURE_USABLE (BMI2)),
+				     __wcpcpy_evex)
+	      X86_IFUNC_IMPL_ADD_V3 (array, i, wcpcpy,
+				     1,
+				     __wcpcpy_generic))
+
+  /* Support sysdeps/x86_64/multiarch/wcpncpy.c.  */
+  IFUNC_IMPL (i, name, wcpncpy,
+	      X86_IFUNC_IMPL_ADD_V4 (array, i, wcpncpy,
+				     (CPU_FEATURE_USABLE (AVX512VL)
+				      && CPU_FEATURE_USABLE (AVX512BW)
+				      && CPU_FEATURE_USABLE (BMI2)),
+				     __wcpncpy_evex)
+	      X86_IFUNC_IMPL_ADD_V3 (array, i, wcsncpy,
+				     1,
+				     __wcpncpy_generic))
+
+  /* Support sysdeps/x86_64/multiarch/wcscat.c.  */
+  IFUNC_IMPL (i, name, wcscat,
+	      X86_IFUNC_IMPL_ADD_V4 (array, i, wcscat,
+				     (CPU_FEATURE_USABLE (AVX512VL)
+				      && CPU_FEATURE_USABLE (AVX512BW)
+				      && CPU_FEATURE_USABLE (BMI2)),
+				     __wcscat_evex)
+	      X86_IFUNC_IMPL_ADD_V3 (array, i, wcscat,
+				     1,
+				     __wcscat_generic))
+
+  /* Support sysdeps/x86_64/multiarch/wcsncat.c.  */
+  IFUNC_IMPL (i, name, wcsncat,
+	      X86_IFUNC_IMPL_ADD_V4 (array, i, wcsncat,
+				     (CPU_FEATURE_USABLE (AVX512VL)
+				      && CPU_FEATURE_USABLE (AVX512BW)
+				      && CPU_FEATURE_USABLE (BMI2)),
+				     __wcsncat_evex)
+	      X86_IFUNC_IMPL_ADD_V3 (array, i, wcsncat,
+				     1,
+				     __wcsncat_generic))
+
   /* Support sysdeps/x86_64/multiarch/wcslen.c.  */
   IFUNC_IMPL (i, name, wcslen,
 	      X86_IFUNC_IMPL_ADD_V4 (array, i, wcslen,
diff --git a/sysdeps/x86_64/multiarch/ifunc-wcs.h b/sysdeps/x86_64/multiarch/ifunc-wcs.h
new file mode 100644
index 0000000..1d2a634
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/ifunc-wcs.h
@@ -0,0 +1,48 @@
+/* Common definition for ifunc selections optimized wide-character
+   string copy functions.
+
+   All versions must be listed in ifunc-impl-list.c.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <init-arch.h>
+
+#ifndef GENERIC
+# define GENERIC generic
+#endif
+
+extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden;
+
+extern __typeof (REDIRECT_NAME) OPTIMIZE (GENERIC) attribute_hidden;
+
+static inline void *
+IFUNC_SELECTOR (void)
+{
+  const struct cpu_features *cpu_features = __get_cpu_features ();
+
+  if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2)
+      && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2)
+      && X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
+				      AVX_Fast_Unaligned_Load, ))
+    {
+      if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
+	  && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
+	return OPTIMIZE (evex);
+    }
+
+  return OPTIMIZE (GENERIC);
+}
diff --git a/sysdeps/x86_64/multiarch/wcpcpy-evex.S b/sysdeps/x86_64/multiarch/wcpcpy-evex.S
new file mode 100644
index 0000000..ac6429c
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcpcpy-evex.S
@@ -0,0 +1,8 @@
+#ifndef WCPCPY
+# define WCPCPY	__wcpcpy_evex
+#endif
+
+#define USE_AS_STPCPY
+#define USE_AS_WCSCPY
+#define STRCPY	WCPCPY
+#include "strcpy-evex.S"
diff --git a/sysdeps/x86_64/multiarch/wcpcpy-generic.c b/sysdeps/x86_64/multiarch/wcpcpy-generic.c
new file mode 100644
index 0000000..6039196
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcpcpy-generic.c
@@ -0,0 +1,27 @@
+/* wcpcpy.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* We always need to build this implementation as strspn-sse4 needs to
+   be able to fallback to it.  */
+#include <isa-level.h>
+#if ISA_SHOULD_BUILD (3)
+
+# define WCPCPY __wcpcpy_generic
+# include <wcsmbs/wcpcpy.c>
+
+#endif
diff --git a/sysdeps/x86_64/multiarch/wcpcpy.c b/sysdeps/x86_64/multiarch/wcpcpy.c
new file mode 100644
index 0000000..8f96ddb
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcpcpy.c
@@ -0,0 +1,37 @@
+/* Multiple versions of wcpcpy.
+   All versions must be listed in ifunc-impl-list.c.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Define multiple versions only for the definition in libc.  */
+#if IS_IN (libc)
+# define __wcpcpy __redirect_wcpcpy
+# include <wchar.h>
+# undef __wcpcpy
+
+# define SYMBOL_NAME wcpcpy
+# include <init-arch.h>
+
+# include "ifunc-wcs.h"
+
+libc_ifunc_redirected (__redirect_wcpcpy, __wcpcpy, IFUNC_SELECTOR ());
+weak_alias (__wcpcpy, wcpcpy)
+# ifdef SHARED
+__hidden_ver1 (__wcpcpy, __GI___wcpcpy, __redirect_wcpcpy)
+  __attribute__((visibility ("hidden"))) __attribute_copy__ (wcpcpy);
+# endif
+#endif
diff --git a/sysdeps/x86_64/multiarch/wcpncpy-evex.S b/sysdeps/x86_64/multiarch/wcpncpy-evex.S
new file mode 100644
index 0000000..62ddb69
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcpncpy-evex.S
@@ -0,0 +1,8 @@
+#ifndef WCPNCPY
+# define WCPNCPY	__wcpncpy_evex
+#endif
+
+#define USE_AS_WCSCPY
+#define USE_AS_STPCPY
+#define STRNCPY	WCPNCPY
+#include "strncpy-evex.S"
diff --git a/sysdeps/x86_64/multiarch/wcpncpy-generic.c b/sysdeps/x86_64/multiarch/wcpncpy-generic.c
new file mode 100644
index 0000000..de8d343
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcpncpy-generic.c
@@ -0,0 +1,27 @@
+/* wcpncpy.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* We always need to build this implementation as strspn-sse4 needs to
+   be able to fallback to it.  */
+#include <isa-level.h>
+#if ISA_SHOULD_BUILD (3)
+
+# define WCPNCPY __wcpncpy_generic
+# include <wcsmbs/wcpncpy.c>
+
+#endif
diff --git a/sysdeps/x86_64/multiarch/wcpncpy.c b/sysdeps/x86_64/multiarch/wcpncpy.c
new file mode 100644
index 0000000..ed8f307
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcpncpy.c
@@ -0,0 +1,37 @@
+/* Multiple versions of wcpncpy.
+   All versions must be listed in ifunc-impl-list.c.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Define multiple versions only for the definition in libc.  */
+#if IS_IN (libc)
+# define __wcpncpy __redirect_wcpncpy
+# include <wchar.h>
+# undef __wcpncpy
+
+# define SYMBOL_NAME wcpncpy
+# include <init-arch.h>
+
+# include "ifunc-wcs.h"
+
+libc_ifunc_redirected (__redirect_wcpncpy, __wcpncpy, IFUNC_SELECTOR ());
+weak_alias (__wcpncpy, wcpncpy)
+# ifdef SHARED
+__hidden_ver1 (__wcpncpy, __GI___wcpncpy, __redirect_wcpncpy)
+  __attribute__((visibility ("hidden"))) __attribute_copy__ (wcpncpy);
+# endif
+#endif
diff --git a/sysdeps/x86_64/multiarch/wcscat-evex.S b/sysdeps/x86_64/multiarch/wcscat-evex.S
new file mode 100644
index 0000000..1d017e4
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcscat-evex.S
@@ -0,0 +1,9 @@
+#ifndef WCSCAT
+# define WCSCAT	__wcscat_evex
+#endif
+
+#define USE_AS_WCSCPY
+#define USE_AS_STRCAT
+
+#define STRCPY	WCSCAT
+#include "strcpy-evex.S"
diff --git a/sysdeps/x86_64/multiarch/wcscat-generic.c b/sysdeps/x86_64/multiarch/wcscat-generic.c
new file mode 100644
index 0000000..d86b4d5
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcscat-generic.c
@@ -0,0 +1,27 @@
+/* wcscat.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* We always need to build this implementation as strspn-sse4 needs to
+   be able to fallback to it.  */
+#include <isa-level.h>
+#if ISA_SHOULD_BUILD (3)
+
+# define WCSCAT __wcscat_generic
+# include <wcsmbs/wcscat.c>
+
+#endif
diff --git a/sysdeps/x86_64/multiarch/wcscat.c b/sysdeps/x86_64/multiarch/wcscat.c
new file mode 100644
index 0000000..3277c44
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcscat.c
@@ -0,0 +1,37 @@
+/* Multiple versions of wcscat.
+   All versions must be listed in ifunc-impl-list.c.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Define multiple versions only for the definition in libc.  */
+#if IS_IN (libc)
+# define __wcscat __redirect_wcscat
+# include <wchar.h>
+# undef __wcscat
+
+# define SYMBOL_NAME wcscat
+# include <init-arch.h>
+
+# include "ifunc-wcs.h"
+
+libc_ifunc_redirected (__redirect_wcscat, __wcscat, IFUNC_SELECTOR ());
+weak_alias (__wcscat, wcscat)
+# ifdef SHARED
+__hidden_ver1 (__wcscat, __GI___wcscat, __redirect_wcscat)
+  __attribute__((visibility ("hidden"))) __attribute_copy__ (wcscat);
+# endif
+#endif
diff --git a/sysdeps/x86_64/multiarch/wcscpy-evex.S b/sysdeps/x86_64/multiarch/wcscpy-evex.S
new file mode 100644
index 0000000..1069a8e
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcscpy-evex.S
@@ -0,0 +1,7 @@
+#ifndef WCSCPY
+# define WCSCPY	__wcscpy_evex
+#endif
+
+#define USE_AS_WCSCPY
+#define STRCPY	WCSCPY
+#include "strcpy-evex.S"
diff --git a/sysdeps/x86_64/multiarch/wcscpy-generic.c b/sysdeps/x86_64/multiarch/wcscpy-generic.c
index 93d314a..4a1fffa 100644
--- a/sysdeps/x86_64/multiarch/wcscpy-generic.c
+++ b/sysdeps/x86_64/multiarch/wcscpy-generic.c
@@ -18,8 +18,7 @@
 
 
 #include <isa-level.h>
-
-#if ISA_SHOULD_BUILD (1)
+#if ISA_SHOULD_BUILD (3)
 
 # define WCSCPY  __wcscpy_generic
 # include <wcsmbs/wcscpy.c>
diff --git a/sysdeps/x86_64/multiarch/wcscpy.c b/sysdeps/x86_64/multiarch/wcscpy.c
index 92c917b..9ad77da 100644
--- a/sysdeps/x86_64/multiarch/wcscpy.c
+++ b/sysdeps/x86_64/multiarch/wcscpy.c
@@ -26,6 +26,8 @@
 # define SYMBOL_NAME wcscpy
 # include <init-arch.h>
 
+extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden;
+
 extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden;
 
 extern __typeof (REDIRECT_NAME) OPTIMIZE (generic) attribute_hidden;
@@ -35,6 +37,15 @@ IFUNC_SELECTOR (void)
 {
   const struct cpu_features* cpu_features = __get_cpu_features ();
 
+  if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2)
+      && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2)
+      && X86_ISA_CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load, ))
+    {
+      if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
+	  && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
+	return OPTIMIZE (evex);
+    }
+
   if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, SSSE3))
     return OPTIMIZE (ssse3);
 
diff --git a/sysdeps/x86_64/multiarch/wcsncat-evex.S b/sysdeps/x86_64/multiarch/wcsncat-evex.S
new file mode 100644
index 0000000..3922159
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcsncat-evex.S
@@ -0,0 +1,9 @@
+#ifndef WCSCAT
+# define WCSCAT	__wcsncat_evex
+#endif
+
+#define USE_AS_WCSCPY
+#define USE_AS_STRCAT
+
+#define STRNCAT	WCSCAT
+#include "strncat-evex.S"
diff --git a/sysdeps/x86_64/multiarch/wcsncat-generic.c b/sysdeps/x86_64/multiarch/wcsncat-generic.c
new file mode 100644
index 0000000..4b55cb4
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcsncat-generic.c
@@ -0,0 +1,27 @@
+/* wcsncat.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* We always need to build this implementation as strspn-sse4 needs to
+   be able to fallback to it.  */
+#include <isa-level.h>
+#if ISA_SHOULD_BUILD (3)
+
+# define WCSNCAT __wcsncat_generic
+# include <wcsmbs/wcsncat.c>
+
+#endif
diff --git a/sysdeps/x86_64/multiarch/wcsncat.c b/sysdeps/x86_64/multiarch/wcsncat.c
new file mode 100644
index 0000000..49c46ae
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcsncat.c
@@ -0,0 +1,34 @@
+/* Multiple versions of wcsncat.
+   All versions must be listed in ifunc-impl-list.c.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Define multiple versions only for the definition in libc.  */
+#if IS_IN (libc)
+# define wcsncat __redirect_wcsncat
+# include <wchar.h>
+# undef wcsncat
+
+# define SYMBOL_NAME wcsncat
+# include "ifunc-wcs.h"
+
+libc_ifunc_redirected (__redirect_wcsncat, wcsncat, IFUNC_SELECTOR ());
+# ifdef SHARED
+__hidden_ver1 (wcsncat, __GI_wcsncat, __redirect_wcsncat)
+  __attribute__((visibility ("hidden"))) __attribute_copy__ (wcsncat);
+# endif
+#endif
diff --git a/sysdeps/x86_64/multiarch/wcsncpy-evex.S b/sysdeps/x86_64/multiarch/wcsncpy-evex.S
new file mode 100644
index 0000000..2debb8f
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcsncpy-evex.S
@@ -0,0 +1,7 @@
+#ifndef WCSNCPY
+# define WCSNCPY	__wcsncpy_evex
+#endif
+
+#define USE_AS_WCSCPY
+#define STRNCPY	WCSNCPY
+#include "strncpy-evex.S"
diff --git a/sysdeps/x86_64/multiarch/wcsncpy-generic.c b/sysdeps/x86_64/multiarch/wcsncpy-generic.c
new file mode 100644
index 0000000..d0e8a86
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcsncpy-generic.c
@@ -0,0 +1,27 @@
+/* wcsncpy.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* We always need to build this implementation as strspn-sse4 needs to
+   be able to fallback to it.  */
+#include <isa-level.h>
+#if ISA_SHOULD_BUILD (3)
+
+# define WCSNCPY __wcsncpy_generic
+# include <wcsmbs/wcsncpy.c>
+
+#endif
diff --git a/sysdeps/x86_64/multiarch/wcsncpy.c b/sysdeps/x86_64/multiarch/wcsncpy.c
new file mode 100644
index 0000000..5b89dd4
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcsncpy.c
@@ -0,0 +1,37 @@
+/* Multiple versions of wcsncpy.
+   All versions must be listed in ifunc-impl-list.c.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Define multiple versions only for the definition in libc.  */
+#if IS_IN (libc)
+# define __wcsncpy __redirect_wcsncpy
+# include <wchar.h>
+# undef __wcsncpy
+
+# define SYMBOL_NAME wcsncpy
+# include <init-arch.h>
+
+# include "ifunc-wcs.h"
+
+libc_ifunc_redirected (__redirect_wcsncpy, __wcsncpy, IFUNC_SELECTOR ());
+weak_alias (__wcsncpy, wcsncpy)
+# ifdef SHARED
+__hidden_ver1 (__wcsncpy, __GI___wcsncpy, __redirect_wcsncpy)
+  __attribute__((visibility ("hidden"))) __attribute_copy__ (wcsncpy);
+# endif
+#endif
diff --git a/sysdeps/x86_64/wcpcpy-generic.c b/sysdeps/x86_64/wcpcpy-generic.c
new file mode 100644
index 0000000..3ddc988
--- /dev/null
+++ b/sysdeps/x86_64/wcpcpy-generic.c
@@ -0,0 +1,31 @@
+/* ISA level static dispatch for wcpcpy .c files.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* wcpcpy non-multiarch build is split into two files,
+   wcpcpy-generic.c and wcpcpy.S. The wcpcpy-generic.c build is
+   for ISA level <= 1 and just uses multiarch/wcpcpy-generic.c.
+   This must be split into two files because we cannot include C
+   code from assembly or vice versa.  */
+
+#include <isa-level.h>
+
+#if MINIMUM_X86_ISA_LEVEL <= 3
+
+# include <wcsmbs/wcpcpy.c>
+
+#endif
diff --git a/sysdeps/x86_64/wcpcpy.S b/sysdeps/x86_64/wcpcpy.S
new file mode 100644
index 0000000..4e4fca7
--- /dev/null
+++ b/sysdeps/x86_64/wcpcpy.S
@@ -0,0 +1,40 @@
+/* ISA level static dispatch for wcpcpy .S files.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* wcpcpy non-multiarch build is split into two files,
+   wcpcpy-generic.c and wcpcpy.S. The wcpcpy-generic.c build is
+   for ISA level <= 1 and just uses multiarch/wcpcpy-generic.c.
+   This must be split into two files because we cannot include C
+   code from assembly or vice versa.  */
+
+#include <isa-level.h>
+
+#if MINIMUM_X86_ISA_LEVEL >= 4
+
+# define WCPCPY	__wcpcpy
+
+# define DEFAULT_IMPL_V4	"multiarch/wcpcpy-evex.S"
+/* isa-default-impl.h expects DEFAULT_IMPL_V1 to be defined but it
+   should never be used from here.  */
+# define DEFAULT_IMPL_V1	"ERROR -- Invalid ISA IMPL"
+
+# include "isa-default-impl.h"
+
+weak_alias (__wcpcpy, wcpcpy)
+libc_hidden_def (__wcpcpy)
+#endif
diff --git a/sysdeps/x86_64/wcpncpy-generic.c b/sysdeps/x86_64/wcpncpy-generic.c
new file mode 100644
index 0000000..0c76e56
--- /dev/null
+++ b/sysdeps/x86_64/wcpncpy-generic.c
@@ -0,0 +1,31 @@
+/* ISA level static dispatch for wcpncpy .c files.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* wcpncpy non-multiarch build is split into two files,
+   wcpncpy-generic.c and wcpncpy.S. The wcpncpy-generic.c build is
+   for ISA level <= 1 and just uses multiarch/wcpncpy-generic.c.
+   This must be split into two files because we cannot include C
+   code from assembly or vice versa.  */
+
+#include <isa-level.h>
+
+#if MINIMUM_X86_ISA_LEVEL <= 3
+
+# include <wcsmbs/wcpncpy.c>
+
+#endif
diff --git a/sysdeps/x86_64/wcpncpy.S b/sysdeps/x86_64/wcpncpy.S
new file mode 100644
index 0000000..b4e5314
--- /dev/null
+++ b/sysdeps/x86_64/wcpncpy.S
@@ -0,0 +1,40 @@
+/* ISA level static dispatch for wcpcpy .S files.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* wcpncpy non-multiarch build is split into two files,
+   wcpncpy-generic.c and wcpncpy.S. The wcpncpy-generic.c build is
+   for ISA level <= 1 and just uses multiarch/wcpncpy-generic.c.
+   This must be split into two files because we cannot include C
+   code from assembly or vice versa.  */
+
+#include <isa-level.h>
+
+#if MINIMUM_X86_ISA_LEVEL >= 4
+
+# define WCPNCPY	__wcpncpy
+
+# define DEFAULT_IMPL_V4	"multiarch/wcpncpy-evex.S"
+/* isa-default-impl.h expects DEFAULT_IMPL_V1 to be defined but it
+   should never be used from here.  */
+# define DEFAULT_IMPL_V1	"ERROR -- Invalid ISA IMPL"
+
+# include "isa-default-impl.h"
+
+weak_alias (__wcpncpy, wcpncpy)
+libc_hidden_def (__wcpncpy)
+#endif
diff --git a/sysdeps/x86_64/wcscat-generic.c b/sysdeps/x86_64/wcscat-generic.c
new file mode 100644
index 0000000..512d0e4
--- /dev/null
+++ b/sysdeps/x86_64/wcscat-generic.c
@@ -0,0 +1,31 @@
+/* ISA level static dispatch for wcscat .c files.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* wcscat non-multiarch build is split into two files,
+   wcscat-generic.c and wcscat.S. The wcscat-generic.c build is
+   for ISA level <= 1 and just uses multiarch/wcscat-generic.c.
+   This must be split into two files because we cannot include C
+   code from assembly or vice versa.  */
+
+#include <isa-level.h>
+
+#if MINIMUM_X86_ISA_LEVEL <= 3
+
+# include <wcsmbs/wcscat.c>
+
+#endif
diff --git a/sysdeps/x86_64/wcscat.S b/sysdeps/x86_64/wcscat.S
new file mode 100644
index 0000000..ee8360b
--- /dev/null
+++ b/sysdeps/x86_64/wcscat.S
@@ -0,0 +1,40 @@
+/* ISA level static dispatch for wcscat .S files.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* wcscat non-multiarch build is split into two files,
+   wcscat-generic.c and wcscat.S. The wcscat-generic.c build is
+   for ISA level <= 1 and just uses multiarch/wcscat-generic.c.
+   This must be split into two files because we cannot include C
+   code from assembly or vice versa.  */
+
+#include <isa-level.h>
+
+#if MINIMUM_X86_ISA_LEVEL >= 4
+
+# define WCSCAT	__wcscat
+
+# define DEFAULT_IMPL_V4	"multiarch/wcscat-evex.S"
+/* isa-default-impl.h expects DEFAULT_IMPL_V1 to be defined but it
+   should never be used from here.  */
+# define DEFAULT_IMPL_V1	"ERROR -- Invalid ISA IMPL"
+
+# include "isa-default-impl.h"
+
+weak_alias (__wcscat, wcscat)
+libc_hidden_def (__wcscat)
+#endif
diff --git a/sysdeps/x86_64/wcscpy.S b/sysdeps/x86_64/wcscpy.S
index 11d0bb4..e403579 100644
--- a/sysdeps/x86_64/wcscpy.S
+++ b/sysdeps/x86_64/wcscpy.S
@@ -1,4 +1,4 @@
-/* wcscpy dispatch for RTLD and non-multiarch .c files
+/* ISA level static dispatch for wcscpy .S files.
    Copyright (C) 2022 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -28,6 +28,7 @@
 
 # define WCSCPY	__wcscpy
 
+# define DEFAULT_IMPL_V4	"multiarch/wcscpy-evex.S"
 # define DEFAULT_IMPL_V2	"multiarch/wcscpy-ssse3.S"
 /* isa-default-impl.h expects DEFAULT_IMPL_V1 to be defined but it
    should never be used from here.  */
diff --git a/sysdeps/x86_64/wcsncat-generic.c b/sysdeps/x86_64/wcsncat-generic.c
new file mode 100644
index 0000000..86e20d9
--- /dev/null
+++ b/sysdeps/x86_64/wcsncat-generic.c
@@ -0,0 +1,31 @@
+/* ISA level static dispatch for wcsncat .c files.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* wcsncat non-multiarch build is split into two files,
+   wcsncat-generic.c and wcsncat.S. The wcsncat-generic.c build is
+   for ISA level <= 1 and just uses multiarch/wcsncat-generic.c.
+   This must be split into two files because we cannot include C
+   code from assembly or vice versa.  */
+
+#include <isa-level.h>
+
+#if MINIMUM_X86_ISA_LEVEL <= 3
+
+# include <wcsmbs/wcsncat.c>
+
+#endif
diff --git a/sysdeps/x86_64/wcsncat.S b/sysdeps/x86_64/wcsncat.S
new file mode 100644
index 0000000..090055a
--- /dev/null
+++ b/sysdeps/x86_64/wcsncat.S
@@ -0,0 +1,38 @@
+/* ISA level static dispatch for wcsncat .S files.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* wcsncat non-multiarch build is split into two files,
+   wcsncat-generic.c and wcsncat.S. The wcsncat-generic.c build is
+   for ISA level <= 1 and just uses multiarch/wcsncat-generic.c.
+   This must be split into two files because we cannot include C
+   code from assembly or vice versa.  */
+
+#include <isa-level.h>
+
+#if MINIMUM_X86_ISA_LEVEL >= 4
+
+# define WCSNCAT	wcsncat
+
+# define DEFAULT_IMPL_V4	"multiarch/wcsncat-evex.S"
+/* isa-default-impl.h expects DEFAULT_IMPL_V1 to be defined but it
+   should never be used from here.  */
+# define DEFAULT_IMPL_V1	"ERROR -- Invalid ISA IMPL"
+
+# include "isa-default-impl.h"
+
+#endif
diff --git a/sysdeps/x86_64/wcsncpy-generic.c b/sysdeps/x86_64/wcsncpy-generic.c
new file mode 100644
index 0000000..0f0ee65
--- /dev/null
+++ b/sysdeps/x86_64/wcsncpy-generic.c
@@ -0,0 +1,31 @@
+/* ISA level static dispatch for wcsncpy .c files.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* wcsncpy non-multiarch build is split into two files,
+   wcsncpy-generic.c and wcsncpy.S. The wcsncpy-generic.c build is
+   for ISA level <= 1 and just uses multiarch/wcsncpy-generic.c.
+   This must be split into two files because we cannot include C
+   code from assembly or vice versa.  */
+
+#include <isa-level.h>
+
+#if MINIMUM_X86_ISA_LEVEL <= 3
+
+# include <wcsmbs/wcsncpy.c>
+
+#endif
diff --git a/sysdeps/x86_64/wcsncpy.S b/sysdeps/x86_64/wcsncpy.S
new file mode 100644
index 0000000..32eaf11
--- /dev/null
+++ b/sysdeps/x86_64/wcsncpy.S
@@ -0,0 +1,40 @@
+/* ISA level static dispatch for wcsncpy .S files.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* wcsncpy non-multiarch build is split into two files,
+   wcsncpy-generic.c and wcsncpy.S. The wcsncpy-generic.c build is
+   for ISA level <= 1 and just uses multiarch/wcsncpy-generic.c.
+   This must be split into two files because we cannot include C
+   code from assembly or vice versa.  */
+
+#include <isa-level.h>
+
+#if MINIMUM_X86_ISA_LEVEL >= 4
+
+# define WCSNCPY	__wcsncpy
+
+# define DEFAULT_IMPL_V4	"multiarch/wcsncpy-evex.S"
+/* isa-default-impl.h expects DEFAULT_IMPL_V1 to be defined but it
+   should never be used from here.  */
+# define DEFAULT_IMPL_V1	"ERROR -- Invalid ISA IMPL"
+
+# include "isa-default-impl.h"
+
+weak_alias (__wcsncpy, wcsncpy)
+libc_hidden_def (__wcsncpy)
+#endif