Add optimized strncasecmp versions for x86-64.

14 files changed, 774 insertions, 286 deletions

diff --git a/ChangeLog b/ChangeLog
index 21f9ed7049..dd78abe472 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,22 @@
 2010-08-14  Ulrich Drepper  <drepper@redhat.com>
 
+	* sysdeps/x86_64/Makefile [subdir=string] (sysdep_routines): Add
+	strncase_l-nonascii.
+	* sysdeps/x86_64/multiarch/Makefile [subdir=string] (sysdep_routines):
+	Add strncase_l-ssse3.
+	* sysdeps/x86_64/multiarch/strcmp.S: Prepare for use as strncasecmp.
+	* sysdeps/x86_64/strcmp.S: Likewise.
+	* sysdeps/x86_64/multiarch/strncase_l-ssse3.S: New file.
+	* sysdeps/x86_64/multiarch/strncase_l.S: New file.
+	* sysdeps/x86_64/strncase.S: New file.
+	* sysdeps/x86_64/strncase_l-nonascii.c: New file.
+	* sysdeps/x86_64/strncase_l.S: New file.
+	* string/Makefile (strop-tests): Add strncasecmp.
+	* string/test-strncasecmp.c: New file.
+
+	* sysdeps/x86_64/strcasecmp_l-nonascii.c: Add prototype to avoid
+	warning.
+
 	* sysdeps/x86_64/strcmp.S: Move definition of NO_NOLOCALE_ALIAS to...
 	* sysdeps/x86_64/multiarch/strcasecmp_l-ssse3.S: ... here.
 
diff --git a/NEWS b/NEWS
index eba00f4e52..f3094d18aa 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,4 @@
-GNU C Library NEWS -- history of user-visible changes.  2010-8-12
+GNU C Library NEWS -- history of user-visible changes.  2010-8-14
 Copyright (C) 1992-2009, 2010 Free Software Foundation, Inc.
 See the end for copying conditions.
 
@@ -15,7 +15,8 @@ Version 2.13
 
 * POWER7 optimizations: memset, memcmp, strncmp
 
-* New optimized string functions for x86-64: strnlen, strcasecmp
+* New optimized string functions for x86-64: strnlen (SSE2),
+  strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
   Implemented by Ulrich Drepper.
 
 Version 2.12
diff --git a/string/Makefile b/string/Makefile
index 4c160e9d2d..cc2da10a4e 100644
--- a/string/Makefile
+++ b/string/Makefile
@@ -49,7 +49,7 @@ o-objects.ob	:= memcpy.o memset.o memchr.o
 strop-tests	:= memchr memcmp memcpy memmove mempcpy memset memccpy	\
 		   stpcpy stpncpy strcat strchr strcmp strcpy strcspn	\
 		   strlen strncmp strncpy strpbrk strrchr strspn memmem	\
-		   strstr strcasestr strnlen strcasecmp
+		   strstr strcasestr strnlen strcasecmp strncasecmp
 tests		:= tester inl-tester noinl-tester testcopy test-ffs	\
 		   tst-strlen stratcliff tst-svc tst-inlcall		\
 		   bug-strncat1 bug-strspn1 bug-strpbrk1 tst-bswap	\
diff --git a/string/test-strncasecmp.c b/string/test-strncasecmp.c
new file mode 100644
index 0000000000..80e4d6315e
--- /dev/null
+++ b/string/test-strncasecmp.c
@@ -0,0 +1,318 @@
+/* Test and measure strncasecmp functions.
+   Copyright (C) 1999, 2002, 2003, 2005, 2010 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Written by Jakub Jelinek <jakub@redhat.com>, 1999.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <ctype.h>
+#define TEST_MAIN
+#include "test-string.h"
+
+typedef int (*proto_t) (const char *, const char *, size_t);
+static int simple_strncasecmp (const char *, const char *, size_t);
+static int stupid_strncasecmp (const char *, const char *, size_t);
+
+IMPL (stupid_strncasecmp, 0)
+IMPL (simple_strncasecmp, 0)
+IMPL (strncasecmp, 1)
+
+static int
+simple_strncasecmp (const char *s1, const char *s2, size_t n)
+{
+  int ret;
+
+  if (n == 0)
+    return 0;
+
+  while ((ret = ((unsigned char) tolower (*s1)
+		 - (unsigned char) tolower (*s2))) == 0
+	 && *s1++)
+    {
+      if (--n == 0)
+	return 0;
+      ++s2;
+    }
+  return ret;
+}
+
+static int
+stupid_strncasecmp (const char *s1, const char *s2, size_t max)
+{
+  size_t ns1 = strlen (s1) + 1;
+  size_t ns2 = strlen (s2) + 1;
+  size_t n = ns1 < ns2 ? ns1 : ns2;
+  if (n > max)
+    n = max;
+  int ret = 0;
+
+  while (n--)
+    {
+      if ((ret = ((unsigned char) tolower (*s1)
+		  - (unsigned char) tolower (*s2))) != 0)
+	break;
+      ++s1;
+      ++s2;
+    }
+  return ret;
+}
+
+static void
+do_one_test (impl_t *impl, const char *s1, const char *s2, size_t n,
+	     int exp_result)
+{
+  int result = CALL (impl, s1, s2, n);
+  if ((exp_result == 0 && result != 0)
+      || (exp_result < 0 && result >= 0)
+      || (exp_result > 0 && result <= 0))
+    {
+      error (0, 0, "Wrong result in function %s %d %d", impl->name,
+	     result, exp_result);
+      ret = 1;
+      return;
+    }
+
+  if (HP_TIMING_AVAIL)
+    {
+      hp_timing_t start __attribute ((unused));
+      hp_timing_t stop __attribute ((unused));
+      hp_timing_t best_time = ~ (hp_timing_t) 0;
+      size_t i;
+
+      for (i = 0; i < 32; ++i)
+	{
+	  HP_TIMING_NOW (start);
+	  CALL (impl, s1, s2, n);
+	  HP_TIMING_NOW (stop);
+	  HP_TIMING_BEST (best_time, start, stop);
+	}
+
+      printf ("\t%zd", (size_t) best_time);
+    }
+}
+
+static void
+do_test (size_t align1, size_t align2, size_t n, size_t len, int max_char,
+	 int exp_result)
+{
+  size_t i;
+  char *s1, *s2;
+
+  if (len == 0)
+    return;
+
+  align1 &= 7;
+  if (align1 + len + 1 >= page_size)
+    return;
+
+  align2 &= 7;
+  if (align2 + len + 1 >= page_size)
+    return;
+
+  s1 = (char *) (buf1 + align1);
+  s2 = (char *) (buf2 + align2);
+
+  for (i = 0; i < len; i++)
+    {
+      s1[i] = toupper (1 + 23 * i % max_char);
+      s2[i] = tolower (s1[i]);
+    }
+
+  s1[len] = s2[len] = 0;
+  s1[len + 1] = 23;
+  s2[len + 1] = 24 + exp_result;
+  if ((s2[len - 1] == 'z' && exp_result == -1)
+      || (s2[len - 1] == 'a' && exp_result == 1))
+    s1[len - 1] += exp_result;
+  else
+    s2[len - 1] -= exp_result;
+
+  if (HP_TIMING_AVAIL)
+    printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
+
+  FOR_EACH_IMPL (impl, 0)
+    do_one_test (impl, s1, s2, n, exp_result);
+
+  if (HP_TIMING_AVAIL)
+    putchar ('\n');
+}
+
+static void
+do_random_tests (void)
+{
+  size_t i, j, n, align1, align2, pos, len1, len2;
+  int result;
+  long r;
+  unsigned char *p1 = buf1 + page_size - 512;
+  unsigned char *p2 = buf2 + page_size - 512;
+
+  for (n = 0; n < ITERATIONS; n++)
+    {
+      align1 = random () & 31;
+      if (random () & 1)
+	align2 = random () & 31;
+      else
+	align2 = align1 + (random () & 24);
+      pos = random () & 511;
+      j = align1 > align2 ? align1 : align2;
+      if (pos + j >= 511)
+	pos = 510 - j - (random () & 7);
+      len1 = random () & 511;
+      if (pos >= len1 && (random () & 1))
+	len1 = pos + (random () & 7);
+      if (len1 + j >= 512)
+	len1 = 511 - j - (random () & 7);
+      if (pos >= len1)
+	len2 = len1;
+      else
+	len2 = len1 + (len1 != 511 - j ? random () % (511 - j - len1) : 0);
+      j = (pos > len2 ? pos : len2) + align1 + 64;
+      if (j > 512)
+	j = 512;
+      for (i = 0; i < j; ++i)
+	{
+	  p1[i] = tolower (random () & 255);
+	  if (i < len1 + align1 && !p1[i])
+	    {
+	      p1[i] = tolower (random () & 255);
+	      if (!p1[i])
+		p1[i] = tolower (1 + (random () & 127));
+	    }
+	}
+      for (i = 0; i < j; ++i)
+	{
+	  p2[i] = toupper (random () & 255);
+	  if (i < len2 + align2 && !p2[i])
+	    {
+	      p2[i] = toupper (random () & 255);
+	      if (!p2[i])
+		toupper (p2[i] = 1 + (random () & 127));
+	    }
+	}
+
+      result = 0;
+      memcpy (p2 + align2, p1 + align1, pos);
+      if (pos < len1)
+	{
+	  if (tolower (p2[align2 + pos]) == p1[align1 + pos])
+	    {
+	      p2[align2 + pos] = toupper (random () & 255);
+	      if (tolower (p2[align2 + pos]) == p1[align1 + pos])
+		p2[align2 + pos] = toupper (p1[align1 + pos]
+					    + 3 + (random () & 127));
+	    }
+
+	  if (p1[align1 + pos] < tolower (p2[align2 + pos]))
+	    result = -1;
+	  else
+	    result = 1;
+	}
+      p1[len1 + align1] = 0;
+      p2[len2 + align2] = 0;
+
+      FOR_EACH_IMPL (impl, 1)
+	{
+	  r = CALL (impl, (char *) (p1 + align1), (char *) (p2 + align2),
+		    pos + 1 + (random () & 255));
+	  /* Test whether on 64-bit architectures where ABI requires
+	     callee to promote has the promotion been done.  */
+	  asm ("" : "=g" (r) : "0" (r));
+	  if ((r == 0 && result)
+	      || (r < 0 && result >= 0)
+	      || (r > 0 && result <= 0))
+	    {
+	      error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd, %zd) %ld != %d, p1 %p p2 %p",
+		     n, impl->name, align1, align2, len1, len2, pos, r, result, p1, p2);
+	      ret = 1;
+	    }
+	}
+    }
+}
+
+int
+test_main (void)
+{
+  size_t i;
+
+  test_init ();
+
+  printf ("%23s", "");
+  FOR_EACH_IMPL (impl, 0)
+    printf ("\t%s", impl->name);
+  putchar ('\n');
+
+  for (i = 1; i < 16; ++i)
+    {
+      do_test (i, i, i - 1, i, 127, 0);
+
+      do_test (i, i, i, i, 127, 0);
+      do_test (i, i, i, i, 127, 1);
+      do_test (i, i, i, i, 127, -1);
+
+      do_test (i, i, i + 1, i, 127, 0);
+      do_test (i, i, i + 1, i, 127, 1);
+      do_test (i, i, i + 1, i, 127, -1);
+    }
+
+  for (i = 1; i < 10; ++i)
+    {
+      do_test (0, 0, (2 << i) - 1, 2 << i, 127, 0);
+      do_test (0, 0, 2 << i, 2 << i, 254, 0);
+      do_test (0, 0, (2 << i) + 1, 2 << i, 127, 0);
+
+      do_test (0, 0, (2 << i) + 1, 2 << i, 254, 0);
+
+      do_test (0, 0, 2 << i, 2 << i, 127, 1);
+      do_test (0, 0, (2 << i) + 10, 2 << i, 127, 1);
+
+      do_test (0, 0, 2 << i, 2 << i, 254, 1);
+      do_test (0, 0, (2 << i) + 10, 2 << i, 254, 1);
+
+      do_test (0, 0, 2 << i, 2 << i, 127, -1);
+      do_test (0, 0, (2 << i) + 10, 2 << i, 127, -1);
+
+      do_test (0, 0, 2 << i, 2 << i, 254, -1);
+      do_test (0, 0, (2 << i) + 10, 2 << i, 254, -1);
+    }
+
+  for (i = 1; i < 8; ++i)
+    {
+      do_test (i, 2 * i, (8 << i) - 1, 8 << i, 127, 0);
+      do_test (i, 2 * i, 8 << i, 8 << i, 127, 0);
+      do_test (i, 2 * i, (8 << i) + 100, 8 << i, 127, 0);
+
+      do_test (2 * i, i, (8 << i) - 1, 8 << i, 254, 0);
+      do_test (2 * i, i, 8 << i, 8 << i, 254, 0);
+      do_test (2 * i, i, (8 << i) + 100, 8 << i, 254, 0);
+
+      do_test (i, 2 * i, 8 << i, 8 << i, 127, 1);
+      do_test (i, 2 * i, (8 << i) + 100, 8 << i, 127, 1);
+
+      do_test (2 * i, i, 8 << i, 8 << i, 254, 1);
+      do_test (2 * i, i, (8 << i) + 100, 8 << i, 254, 1);
+
+      do_test (i, 2 * i, 8 << i, 8 << i, 127, -1);
+      do_test (i, 2 * i, (8 << i) + 100, 8 << i, 127, -1);
+
+      do_test (2 * i, i, 8 << i, 8 << i, 254, -1);
+      do_test (2 * i, i, (8 << i) + 100, 8 << i, 254, -1);
+    }
+
+  do_random_tests ();
+  return ret;
+}
+
+#include "../test-skeleton.c"
diff --git a/sysdeps/x86_64/Makefile b/sysdeps/x86_64/Makefile
index f7eeb155ed..b989f6a976 100644
--- a/sysdeps/x86_64/Makefile
+++ b/sysdeps/x86_64/Makefile
@@ -12,7 +12,7 @@ sysdep_routines += _mcount
 endif
 
 ifeq ($(subdir),string)
-sysdep_routines += cacheinfo strcasecmp_l-nonascii
+sysdep_routines += cacheinfo strcasecmp_l-nonascii strncase_l-nonascii
 gen-as-const-headers += locale-defines.sym
 endif
 
diff --git a/sysdeps/x86_64/multiarch/Makefile b/sysdeps/x86_64/multiarch/Makefile
index 5113dc1ce2..b124524b2e 100644
--- a/sysdeps/x86_64/multiarch/Makefile
+++ b/sysdeps/x86_64/multiarch/Makefile
@@ -7,7 +7,8 @@ ifeq ($(subdir),string)
 sysdep_routines += stpncpy-c strncpy-c strcmp-ssse3 strncmp-ssse3 \
 		   strend-sse4 memcmp-sse4 memcpy-ssse3 mempcpy-ssse3 \
 		   memmove-ssse3 memcpy-ssse3-back mempcpy-ssse3-back \
-		   memmove-ssse3-back strcasestr-nonascii strcasecmp_l-ssse3
+		   memmove-ssse3-back strcasestr-nonascii strcasecmp_l-ssse3 \
+		   strncase_l-ssse3
 ifeq (yes,$(config-cflags-sse4))
 sysdep_routines += strcspn-c strpbrk-c strspn-c strstr-c strcasestr-c
 CFLAGS-strcspn-c.c += -msse4
diff --git a/sysdeps/x86_64/multiarch/strcmp.S b/sysdeps/x86_64/multiarch/strcmp.S
index 3726dbe4d0..764eb09320 100644
--- a/sysdeps/x86_64/multiarch/strcmp.S
+++ b/sysdeps/x86_64/multiarch/strcmp.S
@@ -46,6 +46,24 @@
 # define STRCMP_SSSE3	__strcasecmp_l_ssse3
 # define STRCMP_SSE2	__strcasecmp_l_sse2
 # define __GI_STRCMP	__GI___strcasecmp_l
+#elif defined USE_AS_STRNCASECMP_L
+# include "locale-defines.h"
+
+/* Since the counter, %r11, is unsigned, we branch to strcmp_exitz
+   if the new counter > the old one or is 0.  */
+# define UPDATE_STRNCMP_COUNTER				\
+	/* calculate left number to compare */		\
+	lea	-16(%rcx, %r11), %r9;			\
+	cmp	%r9, %r11;				\
+	jb	LABEL(strcmp_exitz_sse4_2);		\
+	test	%r9, %r9;				\
+	je	LABEL(strcmp_exitz_sse4_2);		\
+	mov	%r9, %r11
+
+# define STRCMP_SSE42	__strncasecmp_l_sse42
+# define STRCMP_SSSE3	__strncasecmp_l_ssse3
+# define STRCMP_SSE2	__strncasecmp_l_sse2
+# define __GI_STRCMP	__GI___strncasecmp_l
 #else
 # define UPDATE_STRNCMP_COUNTER
 # ifndef STRCMP
@@ -100,6 +118,24 @@ ENTRY(__strcasecmp)
 END(__strcasecmp)
 weak_alias (__strcasecmp, strcasecmp)
 # endif
+# ifdef USE_AS_STRNCASECMP_L
+ENTRY(__strncasecmp)
+	.type	__strncasecmp, @gnu_indirect_function
+	cmpl	$0, __cpu_features+KIND_OFFSET(%rip)
+	jne	1f
+	call	__init_cpu_features
+1:
+	leaq	__strncasecmp_sse42(%rip), %rax
+	testl	$bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip)
+	jnz	2f
+	leaq	__strncasecmp_ssse3(%rip), %rax
+	testl	$bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
+	jnz	2f
+	leaq	__strncasecmp_sse2(%rip), %rax
+2:	ret
+END(__strncasecmp)
+weak_alias (__strncasecmp, strncasecmp)
+# endif
 
 /* We use 0x1a:
 	_SIDD_SBYTE_OPS
@@ -131,15 +167,28 @@ weak_alias (__strcasecmp, strcasecmp)
 	.section .text.sse4.2,"ax",@progbits
 	.align	16
 	.type	STRCMP_SSE42, @function
-#ifdef USE_AS_STRCASECMP_L
-	/* 5-byte NOP.  */
-	.byte	0x0f,0x1f,0x44,0x00,0x00
+# ifdef USE_AS_STRCASECMP_L
 ENTRY (__strcasecmp_sse42)
 	movq	__libc_tsd_LOCALE@gottpoff(%rip),%rax
 	movq	%fs:(%rax),%rdx
+
+	// XXX 5 byte should be before the function
+	/* 5-byte NOP.  */
+	.byte	0x0f,0x1f,0x44,0x00,0x00
 END (__strcasecmp_sse42)
 	/* FALLTHROUGH to strcasecmp_l.  */
-#endif
+# endif
+# ifdef USE_AS_STRNCASECMP_L
+ENTRY (__strncasecmp_sse42)
+	movq	__libc_tsd_LOCALE@gottpoff(%rip),%rax
+	movq	%fs:(%rax),%r10
+
+	// XXX 5 byte should be before the function
+	/* 5-byte NOP.  */
+	.byte	0x0f,0x1f,0x44,0x00,0x00
+END (__strncasecmp_sse42)
+	/* FALLTHROUGH to strncasecmp_l.  */
+# endif
 
 STRCMP_SSE42:
 	cfi_startproc
@@ -148,31 +197,42 @@ STRCMP_SSE42:
 /*
  * This implementation uses SSE to compare up to 16 bytes at a time.
  */
-#ifdef USE_AS_STRCASECMP_L
+# ifdef USE_AS_STRCASECMP_L
 	/* We have to fall back on the C implementation for locales
 	   with encodings not matching ASCII for single bytes.  */
-# if LOCALE_T___LOCALES != 0 || LC_CTYPE != 0
+#  if LOCALE_T___LOCALES != 0 || LC_CTYPE != 0
 	movq	LOCALE_T___LOCALES+LC_CTYPE*8(%rdx), %rax
-# else
+#  else
 	movq	(%rdx), %rax
-# endif
+#  endif
 	testl	$0, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES(%rax)
 	jne	__strcasecmp_l_nonascii
-#endif
+# endif
+# ifdef USE_AS_STRNCASECMP_L
+	/* We have to fall back on the C implementation for locales
+	   with encodings not matching ASCII for single bytes.  */
+#  if LOCALE_T___LOCALES != 0 || LC_CTYPE != 0
+	movq	LOCALE_T___LOCALES+LC_CTYPE*8(%r10), %rax
+#  else
+	movq	(%r10), %rax
+#  endif
+	testl	$0, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES(%rax)
+	jne	__strncasecmp_l_nonascii
+# endif
 
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	test	%rdx, %rdx
 	je	LABEL(strcmp_exitz_sse4_2)
 	cmp	$1, %rdx
 	je	LABEL(Byte0_sse4_2)
 	mov	%rdx, %r11
-#endif
+# endif
 	mov	%esi, %ecx
 	mov	%edi, %eax
 /* Use 64bit AND here to avoid long NOP padding.  */
 	and	$0x3f, %rcx		/* rsi alignment in cache line */
 	and	$0x3f, %rax		/* rdi alignment in cache line */
-#ifdef USE_AS_STRCASECMP_L
+# if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
 	.section .rodata.cst16,"aM",@progbits,16
 	.align 16
 .Lbelowupper_sse4:
@@ -186,19 +246,19 @@ STRCMP_SSE42:
 	.quad	0x2020202020202020
 	.previous
 	movdqa	.Lbelowupper_sse4(%rip), %xmm4
-# define UCLOW_reg %xmm4
+#  define UCLOW_reg %xmm4
 	movdqa	.Ltopupper_sse4(%rip), %xmm5
-# define UCHIGH_reg %xmm5
+#  define UCHIGH_reg %xmm5
 	movdqa	.Ltouppermask_sse4(%rip), %xmm6
-# define LCQWORD_reg %xmm6
-#endif
+#  define LCQWORD_reg %xmm6
+# endif
 	cmp	$0x30, %ecx
 	ja	LABEL(crosscache_sse4_2)/* rsi: 16-byte load will cross cache line */
 	cmp	$0x30, %eax
 	ja	LABEL(crosscache_sse4_2)/* rdi: 16-byte load will cross cache line */
 	movdqu	(%rdi), %xmm1
 	movdqu	(%rsi), %xmm2
-# ifdef USE_AS_STRCASECMP_L
+# if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
 #  define TOLOWER(reg1, reg2) \
 	movdqa	reg1, %xmm7;					\
 	movdqa	UCHIGH_reg, %xmm8;				\
@@ -225,10 +285,10 @@ STRCMP_SSE42:
 	pmovmskb %xmm1, %edx
 	sub	$0xffff, %edx		/* if first 16 bytes are same, edx == 0xffff */
 	jnz	LABEL(less16bytes_sse4_2)/* If not, find different value or null char */
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)/* finish comparision */
-#endif
+# endif
 	add	$16, %rsi		/* prepare to search next 16 bytes */
 	add	$16, %rdi		/* prepare to search next 16 bytes */
 
@@ -270,13 +330,13 @@ LABEL(ashr_0_sse4_2):
 	movdqa	(%rsi), %xmm1
 	pxor	%xmm0, %xmm0			/* clear %xmm0 for null char check */
 	pcmpeqb	%xmm1, %xmm0			/* Any null chars? */
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpeqb	(%rdi), %xmm1			/* compare 16 bytes for equality */
-#else
+# else
 	movdqa	(%rdi), %xmm2
 	TOLOWER (%xmm1, %xmm2)
 	pcmpeqb	%xmm2, %xmm1			/* compare 16 bytes for equality */
-#endif
+# endif
 	psubb	%xmm0, %xmm1			/* packed sub of comparison results*/
 	pmovmskb %xmm1, %r9d
 	shr	%cl, %edx			/* adjust 0xffff for offset */
@@ -300,48 +360,48 @@ LABEL(ashr_0_sse4_2):
 	.p2align 4
 LABEL(ashr_0_use_sse4_2):
 	movdqa	(%rdi,%rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri      $0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	lea	16(%rdx), %rdx
 	jbe	LABEL(ashr_0_use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	movdqa	(%rdi,%rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri      $0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	lea	16(%rdx), %rdx
 	jbe	LABEL(ashr_0_use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	jmp	LABEL(ashr_0_use_sse4_2)
 
 
 	.p2align 4
 LABEL(ashr_0_use_sse4_2_exit):
 	jnc	LABEL(strcmp_exitz_sse4_2)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	%rcx, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	lea	-16(%rdx, %rcx), %rcx
 	movzbl	(%rdi, %rcx), %eax
 	movzbl	(%rsi, %rcx), %edx
-# ifdef USE_AS_STRCASECMP_L
+# if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
 	leaq	_nl_C_LC_CTYPE_tolower+128*4(%rip), %rcx
 	movl	(%rcx,%rax,4), %eax
 	movl	(%rcx,%rdx,4), %edx
@@ -394,18 +454,18 @@ LABEL(loop_ashr_1_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $1, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	add	$16, %rdx
 	add	$16, %r10
@@ -413,18 +473,18 @@ LABEL(loop_ashr_1_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $1, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	$16, %rdx
 	jmp	LABEL(loop_ashr_1_use_sse4_2)
 
@@ -434,10 +494,10 @@ LABEL(nibble_ashr_1_use_sse4_2):
 	movdqa	-16(%rdi, %rdx), %xmm0
 	psrldq	$1, %xmm0
 	pcmpistri      $0x3a,%xmm0, %xmm0
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	%r11, %rcx
 	jae	LABEL(nibble_ashr_use_sse4_2_exit)
-#endif
+# endif
 	cmp	$14, %ecx
 	ja	LABEL(loop_ashr_1_use_sse4_2)
 
@@ -486,18 +546,18 @@ LABEL(loop_ashr_2_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $2, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	add	$16, %rdx
 	add	$16, %r10
@@ -505,18 +565,18 @@ LABEL(loop_ashr_2_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $2, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	$16, %rdx
 	jmp	LABEL(loop_ashr_2_use_sse4_2)
 
@@ -526,10 +586,10 @@ LABEL(nibble_ashr_2_use_sse4_2):
 	movdqa	-16(%rdi, %rdx), %xmm0
 	psrldq	$2, %xmm0
 	pcmpistri      $0x3a,%xmm0, %xmm0
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	%r11, %rcx
 	jae	LABEL(nibble_ashr_use_sse4_2_exit)
-#endif
+# endif
 	cmp	$13, %ecx
 	ja	LABEL(loop_ashr_2_use_sse4_2)
 
@@ -578,18 +638,18 @@ LABEL(loop_ashr_3_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $3, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	add	$16, %rdx
 	add	$16, %r10
@@ -597,18 +657,18 @@ LABEL(loop_ashr_3_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $3, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	$16, %rdx
 	jmp	LABEL(loop_ashr_3_use_sse4_2)
 
@@ -618,10 +678,10 @@ LABEL(nibble_ashr_3_use_sse4_2):
 	movdqa	-16(%rdi, %rdx), %xmm0
 	psrldq	$3, %xmm0
 	pcmpistri      $0x3a,%xmm0, %xmm0
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	%r11, %rcx
 	jae	LABEL(nibble_ashr_use_sse4_2_exit)
-#endif
+# endif
 	cmp	$12, %ecx
 	ja	LABEL(loop_ashr_3_use_sse4_2)
 
@@ -671,18 +731,18 @@ LABEL(loop_ashr_4_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $4, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	add	$16, %rdx
 	add	$16, %r10
@@ -690,18 +750,18 @@ LABEL(loop_ashr_4_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $4, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	$16, %rdx
 	jmp	LABEL(loop_ashr_4_use_sse4_2)
 
@@ -711,10 +771,10 @@ LABEL(nibble_ashr_4_use_sse4_2):
 	movdqa	-16(%rdi, %rdx), %xmm0
 	psrldq	$4, %xmm0
 	pcmpistri      $0x3a,%xmm0, %xmm0
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	%r11, %rcx
 	jae	LABEL(nibble_ashr_use_sse4_2_exit)
-#endif
+# endif
 	cmp	$11, %ecx
 	ja	LABEL(loop_ashr_4_use_sse4_2)
 
@@ -764,18 +824,18 @@ LABEL(loop_ashr_5_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $5, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L || !defined USE_AS_STRNCASECMP_L
 	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	add	$16, %rdx
 	add	$16, %r10
@@ -784,18 +844,18 @@ LABEL(loop_ashr_5_use_sse4_2):
 	movdqa	(%rdi, %rdx), %xmm0
 
 	palignr $5, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	$16, %rdx
 	jmp	LABEL(loop_ashr_5_use_sse4_2)
 
@@ -805,10 +865,10 @@ LABEL(nibble_ashr_5_use_sse4_2):
 	movdqa	-16(%rdi, %rdx), %xmm0
 	psrldq	$5, %xmm0
 	pcmpistri      $0x3a,%xmm0, %xmm0
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	%r11, %rcx
 	jae	LABEL(nibble_ashr_use_sse4_2_exit)
-#endif
+# endif
 	cmp	$10, %ecx
 	ja	LABEL(loop_ashr_5_use_sse4_2)
 
@@ -858,18 +918,18 @@ LABEL(loop_ashr_6_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $6, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	add	$16, %rdx
 	add	$16, %r10
@@ -877,18 +937,18 @@ LABEL(loop_ashr_6_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $6, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	$16, %rdx
 	jmp	LABEL(loop_ashr_6_use_sse4_2)
 
@@ -898,10 +958,10 @@ LABEL(nibble_ashr_6_use_sse4_2):
 	movdqa	-16(%rdi, %rdx), %xmm0
 	psrldq	$6, %xmm0
 	pcmpistri      $0x3a,%xmm0, %xmm0
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	%r11, %rcx
 	jae	LABEL(nibble_ashr_use_sse4_2_exit)
-#endif
+# endif
 	cmp	$9, %ecx
 	ja	LABEL(loop_ashr_6_use_sse4_2)
 
@@ -951,18 +1011,18 @@ LABEL(loop_ashr_7_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $7, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	add	$16, %rdx
 	add	$16, %r10
@@ -970,18 +1030,18 @@ LABEL(loop_ashr_7_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $7, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	$16, %rdx
 	jmp	LABEL(loop_ashr_7_use_sse4_2)
 
@@ -991,10 +1051,10 @@ LABEL(nibble_ashr_7_use_sse4_2):
 	movdqa	-16(%rdi, %rdx), %xmm0
 	psrldq	$7, %xmm0
 	pcmpistri      $0x3a,%xmm0, %xmm0
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	%r11, %rcx
 	jae	LABEL(nibble_ashr_use_sse4_2_exit)
-#endif
+# endif
 	cmp	$8, %ecx
 	ja	LABEL(loop_ashr_7_use_sse4_2)
 
@@ -1044,18 +1104,18 @@ LABEL(loop_ashr_8_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $8, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	add	$16, %rdx
 	add	$16, %r10
@@ -1063,18 +1123,18 @@ LABEL(loop_ashr_8_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $8, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	$16, %rdx
 	jmp	LABEL(loop_ashr_8_use_sse4_2)
 
@@ -1084,10 +1144,10 @@ LABEL(nibble_ashr_8_use_sse4_2):
 	movdqa	-16(%rdi, %rdx), %xmm0
 	psrldq	$8, %xmm0
 	pcmpistri      $0x3a,%xmm0, %xmm0
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	%r11, %rcx
 	jae	LABEL(nibble_ashr_use_sse4_2_exit)
-#endif
+# endif
 	cmp	$7, %ecx
 	ja	LABEL(loop_ashr_8_use_sse4_2)
 
@@ -1138,18 +1198,18 @@ LABEL(loop_ashr_9_use_sse4_2):
 	movdqa	(%rdi, %rdx), %xmm0
 
 	palignr $9, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	add	$16, %rdx
 	add	$16, %r10
@@ -1157,18 +1217,18 @@ LABEL(loop_ashr_9_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $9, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	$16, %rdx
 	jmp	LABEL(loop_ashr_9_use_sse4_2)
 
@@ -1178,10 +1238,10 @@ LABEL(nibble_ashr_9_use_sse4_2):
 	movdqa	-16(%rdi, %rdx), %xmm0
 	psrldq	$9, %xmm0
 	pcmpistri      $0x3a,%xmm0, %xmm0
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	%r11, %rcx
 	jae	LABEL(nibble_ashr_use_sse4_2_exit)
-#endif
+# endif
 	cmp	$6, %ecx
 	ja	LABEL(loop_ashr_9_use_sse4_2)
 
@@ -1231,18 +1291,18 @@ LABEL(loop_ashr_10_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $10, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	add	$16, %rdx
 	add	$16, %r10
@@ -1250,18 +1310,18 @@ LABEL(loop_ashr_10_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $10, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	$16, %rdx
 	jmp	LABEL(loop_ashr_10_use_sse4_2)
 
@@ -1271,10 +1331,10 @@ LABEL(nibble_ashr_10_use_sse4_2):
 	movdqa	-16(%rdi, %rdx), %xmm0
 	psrldq	$10, %xmm0
 	pcmpistri      $0x3a,%xmm0, %xmm0
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	%r11, %rcx
 	jae	LABEL(nibble_ashr_use_sse4_2_exit)
-#endif
+# endif
 	cmp	$5, %ecx
 	ja	LABEL(loop_ashr_10_use_sse4_2)
 
@@ -1324,18 +1384,18 @@ LABEL(loop_ashr_11_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $11, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	add	$16, %rdx
 	add	$16, %r10
@@ -1343,18 +1403,18 @@ LABEL(loop_ashr_11_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $11, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	$16, %rdx
 	jmp	LABEL(loop_ashr_11_use_sse4_2)
 
@@ -1364,10 +1424,10 @@ LABEL(nibble_ashr_11_use_sse4_2):
 	movdqa	-16(%rdi, %rdx), %xmm0
 	psrldq	$11, %xmm0
 	pcmpistri      $0x3a,%xmm0, %xmm0
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	%r11, %rcx
 	jae	LABEL(nibble_ashr_use_sse4_2_exit)
-#endif
+# endif
 	cmp	$4, %ecx
 	ja	LABEL(loop_ashr_11_use_sse4_2)
 
@@ -1417,18 +1477,18 @@ LABEL(loop_ashr_12_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $12, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	add	$16, %rdx
 	add	$16, %r10
@@ -1436,18 +1496,18 @@ LABEL(loop_ashr_12_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $12, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	$16, %rdx
 	jmp	LABEL(loop_ashr_12_use_sse4_2)
 
@@ -1457,10 +1517,10 @@ LABEL(nibble_ashr_12_use_sse4_2):
 	movdqa	-16(%rdi, %rdx), %xmm0
 	psrldq	$12, %xmm0
 	pcmpistri      $0x3a,%xmm0, %xmm0
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	%r11, %rcx
 	jae	LABEL(nibble_ashr_use_sse4_2_exit)
-#endif
+# endif
 	cmp	$3, %ecx
 	ja	LABEL(loop_ashr_12_use_sse4_2)
 
@@ -1511,18 +1571,18 @@ LABEL(loop_ashr_13_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $13, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	add	$16, %rdx
 	add	$16, %r10
@@ -1530,18 +1590,18 @@ LABEL(loop_ashr_13_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $13, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	$16, %rdx
 	jmp	LABEL(loop_ashr_13_use_sse4_2)
 
@@ -1551,10 +1611,10 @@ LABEL(nibble_ashr_13_use_sse4_2):
 	movdqa	-16(%rdi, %rdx), %xmm0
 	psrldq	$13, %xmm0
 	pcmpistri      $0x3a,%xmm0, %xmm0
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	%r11, %rcx
 	jae	LABEL(nibble_ashr_use_sse4_2_exit)
-#endif
+# endif
 	cmp	$2, %ecx
 	ja	LABEL(loop_ashr_13_use_sse4_2)
 
@@ -1605,18 +1665,18 @@ LABEL(loop_ashr_14_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $14, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	add	$16, %rdx
 	add	$16, %r10
@@ -1624,18 +1684,18 @@ LABEL(loop_ashr_14_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $14, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	$16, %rdx
 	jmp	LABEL(loop_ashr_14_use_sse4_2)
 
@@ -1645,10 +1705,10 @@ LABEL(nibble_ashr_14_use_sse4_2):
 	movdqa	-16(%rdi, %rdx), %xmm0
 	psrldq	$14, %xmm0
 	pcmpistri      $0x3a,%xmm0, %xmm0
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	%r11, %rcx
 	jae	LABEL(nibble_ashr_use_sse4_2_exit)
-#endif
+# endif
 	cmp	$1, %ecx
 	ja	LABEL(loop_ashr_14_use_sse4_2)
 
@@ -1701,18 +1761,18 @@ LABEL(loop_ashr_15_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $15, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 
 	add	$16, %rdx
 	add	$16, %r10
@@ -1720,18 +1780,18 @@ LABEL(loop_ashr_15_use_sse4_2):
 
 	movdqa	(%rdi, %rdx), %xmm0
 	palignr $15, -16(%rdi, %rdx), %xmm0
-#ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
-#else
+# else
 	movdqa	(%rsi,%rdx), %xmm1
 	TOLOWER (%xmm0, %xmm1)
 	pcmpistri $0x1a, %xmm1, %xmm0
-#endif
+# endif
 	jbe	LABEL(use_sse4_2_exit)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	$16, %rdx
 	jmp	LABEL(loop_ashr_15_use_sse4_2)
 
@@ -1741,10 +1801,10 @@ LABEL(nibble_ashr_15_use_sse4_2):
 	movdqa	-16(%rdi, %rdx), %xmm0
 	psrldq	$15, %xmm0
 	pcmpistri      $0x3a,%xmm0, %xmm0
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	%r11, %rcx
 	jae	LABEL(nibble_ashr_use_sse4_2_exit)
-#endif
+# endif
 	cmp	$0, %ecx
 	ja	LABEL(loop_ashr_15_use_sse4_2)
 
@@ -1753,10 +1813,10 @@ LABEL(nibble_ashr_use_sse4_2_exit):
 	.p2align 4
 LABEL(use_sse4_2_exit):
 	jnc	LABEL(strcmp_exitz_sse4_2)
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	%rcx, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	add	%rcx, %rdx
 	lea	-16(%rdi, %r9), %rdi
 	movzbl	(%rdi, %rdx), %eax
@@ -1765,7 +1825,7 @@ LABEL(use_sse4_2_exit):
 	jz	LABEL(use_sse4_2_ret_sse4_2)
 	xchg	%eax, %edx
 LABEL(use_sse4_2_ret_sse4_2):
-# ifdef USE_AS_STRCASECMP_L
+# if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
 	leaq	_nl_C_LC_CTYPE_tolower+128*4(%rip), %rcx
 	movl	(%rcx,%rdx,4), %edx
 	movl	(%rcx,%rax,4), %eax
@@ -1786,14 +1846,14 @@ LABEL(ret_sse4_2):
 LABEL(less16bytes_sse4_2):
 	bsf	%rdx, %rdx		/* find and store bit index in %rdx */
 
-#ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	%rdx, %r11
 	jbe	LABEL(strcmp_exitz_sse4_2)
-#endif
+# endif
 	movzbl	(%rsi, %rdx), %ecx
 	movzbl	(%rdi, %rdx), %eax
 
-# ifdef USE_AS_STRCASECMP_L
+# if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
 	leaq	_nl_C_LC_CTYPE_tolower+128*4(%rip), %rdx
 	movl	(%rdx,%rcx,4), %ecx
 	movl	(%rdx,%rax,4), %eax
@@ -1812,7 +1872,7 @@ LABEL(Byte0_sse4_2):
 	movzx	(%rsi), %ecx
 	movzx	(%rdi), %eax
 
-# ifdef USE_AS_STRCASECMP_L
+# if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
 	leaq	_nl_C_LC_CTYPE_tolower+128*4(%rip), %rdx
 	movl	(%rdx,%rcx,4), %ecx
 	movl	(%rdx,%rax,4), %eax
@@ -1870,6 +1930,16 @@ LABEL(unaligned_table_sse4_2):
 	cfi_endproc; .size __strcasecmp_sse2, .-__strcasecmp_sse2
 # endif
 
+# ifdef USE_AS_STRNCASECMP_L
+#  define ENTRY2(name) \
+	.type __strncasecmp_sse2, @function; \
+	.align 16; \
+	__strncasecmp_sse2: cfi_startproc; \
+	CALL_MCOUNT
+#  define END2(name) \
+	cfi_endproc; .size __strncasecmp_sse2, .-__strncasecmp_sse2
+# endif
+
 # undef libc_hidden_builtin_def
 /* It doesn't make sense to send libc-internal strcmp calls through a PLT.
    The speedup we get from using SSE4.2 instruction is likely eaten away
diff --git a/sysdeps/x86_64/multiarch/strncase_l-ssse3.S b/sysdeps/x86_64/multiarch/strncase_l-ssse3.S
new file mode 100644
index 0000000000..6728678688
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/strncase_l-ssse3.S
@@ -0,0 +1,6 @@
+#define USE_SSSE3 1
+#define USE_AS_STRNCASECMP_L
+#define NO_NOLOCALE_ALIAS
+#define STRCMP __strncasecmp_l_ssse3
+#define __strncasecmp __strncasecmp_ssse3
+#include "../strcmp.S"
diff --git a/sysdeps/x86_64/multiarch/strncase_l.S b/sysdeps/x86_64/multiarch/strncase_l.S
new file mode 100644
index 0000000000..c725cd85b3
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/strncase_l.S
@@ -0,0 +1,6 @@
+#define STRCMP __strncasecmp_l
+#define USE_AS_STRNCASECMP_L
+#include "strcmp.S"
+
+weak_alias (__strncasecmp_l, strncasecmp_l)
+libc_hidden_def (strncasecmp_l)
diff --git a/sysdeps/x86_64/strcasecmp_l-nonascii.c b/sysdeps/x86_64/strcasecmp_l-nonascii.c
index 7a0a04f345..13b35de82d 100644
--- a/sysdeps/x86_64/strcasecmp_l-nonascii.c
+++ b/sysdeps/x86_64/strcasecmp_l-nonascii.c
@@ -1,5 +1,8 @@
 #include <string.h>
 
+extern int __strcasecmp_l_nonascii (__const char *__s1, __const char *__s2,
+				    __locale_t __loc);
+
 #define __strcasecmp_l __strcasecmp_l_nonascii
 #define USE_IN_EXTENDED_LOCALE_MODEL    1
 #include <string/strcasecmp.c>
diff --git a/sysdeps/x86_64/strcmp.S b/sysdeps/x86_64/strcmp.S
index 1b48f04172..5a4346be05 100644
--- a/sysdeps/x86_64/strcmp.S
+++ b/sysdeps/x86_64/strcmp.S
@@ -60,10 +60,26 @@
 # endif
 
 # define UPDATE_STRNCMP_COUNTER
+#elif defined USE_AS_STRNCASECMP_L
+# include "locale-defines.h"
+
+/* No support for strncasecmp outside libc so far since it is not needed.  */
+# ifdef NOT_IN_lib
+#  error "strncasecmp_l not implemented so far"
+# endif
+
+# define UPDATE_STRNCMP_COUNTER				\
+	/* calculate left number to compare */		\
+	lea	-16(%rcx, %r11), %r9;			\
+	cmp	%r9, %r11;				\
+	jb	LABEL(strcmp_exitz);			\
+	test	%r9, %r9;				\
+	je	LABEL(strcmp_exitz);			\
+	mov	%r9, %r11
 #else
 # define UPDATE_STRNCMP_COUNTER
 # ifndef STRCMP
-#  define STRCMP strcmp
+#  define STRCMP strncasecmp
 # endif
 #endif
 
@@ -79,7 +95,7 @@
 #  define END2(name) END (name)
 # endif
 
-	ENTRY2 (__strcasecmp)
+ENTRY2 (__strcasecmp)
 	movq	__libc_tsd_LOCALE@gottpoff(%rip),%rax
 	movq	%fs:(%rax),%rdx
 
@@ -92,6 +108,25 @@ weak_alias (__strcasecmp, strcasecmp)
 libc_hidden_def (__strcasecmp)
 # endif
 	/* FALLTHROUGH to strcasecmp_l.  */
+#elif defined USE_AS_STRNCASECMP_L
+# ifndef ENTRY2
+#  define ENTRY2(name) ENTRY (name)
+#  define END2(name) END (name)
+# endif
+
+ENTRY2 (__strncasecmp)
+	movq	__libc_tsd_LOCALE@gottpoff(%rip),%rax
+	movq	%fs:(%rax),%r10
+
+	// XXX 5 byte should be before the function
+	/* 5-byte NOP.  */
+	.byte	0x0f,0x1f,0x44,0x00,0x00
+END2 (__strncasecmp)
+# ifndef NO_NOLOCALE_ALIAS
+weak_alias (__strncasecmp, strncasecmp)
+libc_hidden_def (__strncasecmp)
+# endif
+	/* FALLTHROUGH to strncasecmp_l.  */
 #endif
 
 ENTRY (BP_SYM (STRCMP))
@@ -124,12 +159,22 @@ END (BP_SYM (STRCMP))
 #  endif
 	testl	$0, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES(%rax)
 	jne	__strcasecmp_l_nonascii
+# elif defined USE_AS_STRNCASECMP_L
+	/* We have to fall back on the C implementation for locales
+	   with encodings not matching ASCII for single bytes.  */
+#  if LOCALE_T___LOCALES != 0 || LC_CTYPE != 0
+	movq	LOCALE_T___LOCALES+LC_CTYPE*8(%r10), %rax
+#  else
+	movq	(%r10), %rax
+#  endif
+	testl	$0, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES(%rax)
+	jne	__strncasecmp_l_nonascii
 # endif
 
 /*
  * This implementation uses SSE to compare up to 16 bytes at a time.
  */
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	test	%rdx, %rdx
 	je	LABEL(strcmp_exitz)
 	cmp	$1, %rdx
@@ -141,7 +186,7 @@ END (BP_SYM (STRCMP))
 /* Use 64bit AND here to avoid long NOP padding.  */
 	and	$0x3f, %rcx		/* rsi alignment in cache line */
 	and	$0x3f, %rax		/* rdi alignment in cache line */
-# ifdef USE_AS_STRCASECMP_L
+# if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
 	.section .rodata.cst16,"aM",@progbits,16
 	.align 16
 .Lbelowupper:
@@ -155,11 +200,11 @@ END (BP_SYM (STRCMP))
 	.quad	0x2020202020202020
 	.previous
 	movdqa	.Lbelowupper(%rip), %xmm5
-# define UCLOW_reg %xmm5
+#  define UCLOW_reg %xmm5
 	movdqa	.Ltopupper(%rip), %xmm6
-# define UCHIGH_reg %xmm6
+#  define UCHIGH_reg %xmm6
 	movdqa	.Ltouppermask(%rip), %xmm7
-# define LCQWORD_reg %xmm7
+#  define LCQWORD_reg %xmm7
 # endif
 	cmp	$0x30, %ecx
 	ja	LABEL(crosscache)	/* rsi: 16-byte load will cross cache line */
@@ -169,7 +214,7 @@ END (BP_SYM (STRCMP))
 	movlpd	(%rsi), %xmm2
 	movhpd	8(%rdi), %xmm1
 	movhpd	8(%rsi), %xmm2
-# ifdef USE_AS_STRCASECMP_L
+# if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
 #  define TOLOWER(reg1, reg2) \
 	movdqa	reg1, %xmm8;					\
 	movdqa	UCHIGH_reg, %xmm9;				\
@@ -196,7 +241,7 @@ END (BP_SYM (STRCMP))
 	pmovmskb %xmm1, %edx
 	sub	$0xffff, %edx		/* if first 16 bytes are same, edx == 0xffff */
 	jnz	LABEL(less16bytes)	/* If not, find different value or null char */
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)	/* finish comparision */
 # endif
@@ -241,7 +286,7 @@ LABEL(ashr_0):
 	movdqa	(%rsi), %xmm1
 	pxor	%xmm0, %xmm0			/* clear %xmm0 for null char check */
 	pcmpeqb	%xmm1, %xmm0			/* Any null chars? */
-# ifndef USE_AS_STRCASECMP_L
+# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
 	pcmpeqb	(%rdi), %xmm1			/* compare 16 bytes for equality */
 # else
 	movdqa	(%rdi), %xmm2
@@ -280,7 +325,7 @@ LABEL(loop_ashr_0):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)		/* mismatch or null char seen */
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -295,7 +340,7 @@ LABEL(loop_ashr_0):
 	pmovmskb %xmm1, %edx
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -363,7 +408,7 @@ LABEL(gobble_ashr_1):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -393,7 +438,7 @@ LABEL(gobble_ashr_1):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -412,7 +457,7 @@ LABEL(nibble_ashr_1):
 	test	$0xfffe, %edx
 	jnz	LABEL(ashr_1_exittail)	/* find null char*/
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	$14, %r11
 	jbe	LABEL(ashr_1_exittail)
 # endif
@@ -493,7 +538,7 @@ LABEL(gobble_ashr_2):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -524,7 +569,7 @@ LABEL(gobble_ashr_2):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -540,7 +585,7 @@ LABEL(nibble_ashr_2):
 	test	$0xfffc, %edx
 	jnz	LABEL(ashr_2_exittail)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	$13, %r11
 	jbe	LABEL(ashr_2_exittail)
 # endif
@@ -618,7 +663,7 @@ LABEL(gobble_ashr_3):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -649,7 +694,7 @@ LABEL(gobble_ashr_3):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -665,7 +710,7 @@ LABEL(nibble_ashr_3):
 	test	$0xfff8, %edx
 	jnz	LABEL(ashr_3_exittail)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	$12, %r11
 	jbe	LABEL(ashr_3_exittail)
 # endif
@@ -743,7 +788,7 @@ LABEL(gobble_ashr_4):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -774,7 +819,7 @@ LABEL(gobble_ashr_4):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -790,7 +835,7 @@ LABEL(nibble_ashr_4):
 	test	$0xfff0, %edx
 	jnz	LABEL(ashr_4_exittail)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	$11, %r11
 	jbe	LABEL(ashr_4_exittail)
 # endif
@@ -868,7 +913,7 @@ LABEL(gobble_ashr_5):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -899,7 +944,7 @@ LABEL(gobble_ashr_5):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -915,7 +960,7 @@ LABEL(nibble_ashr_5):
 	test	$0xffe0, %edx
 	jnz	LABEL(ashr_5_exittail)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	$10, %r11
 	jbe	LABEL(ashr_5_exittail)
 # endif
@@ -993,7 +1038,7 @@ LABEL(gobble_ashr_6):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1024,7 +1069,7 @@ LABEL(gobble_ashr_6):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1040,7 +1085,7 @@ LABEL(nibble_ashr_6):
 	test	$0xffc0, %edx
 	jnz	LABEL(ashr_6_exittail)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	$9, %r11
 	jbe	LABEL(ashr_6_exittail)
 # endif
@@ -1118,7 +1163,7 @@ LABEL(gobble_ashr_7):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1149,7 +1194,7 @@ LABEL(gobble_ashr_7):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1165,7 +1210,7 @@ LABEL(nibble_ashr_7):
 	test	$0xff80, %edx
 	jnz	LABEL(ashr_7_exittail)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	$8, %r11
 	jbe	LABEL(ashr_7_exittail)
 # endif
@@ -1243,7 +1288,7 @@ LABEL(gobble_ashr_8):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1274,7 +1319,7 @@ LABEL(gobble_ashr_8):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1290,7 +1335,7 @@ LABEL(nibble_ashr_8):
 	test	$0xff00, %edx
 	jnz	LABEL(ashr_8_exittail)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	$7, %r11
 	jbe	LABEL(ashr_8_exittail)
 # endif
@@ -1368,7 +1413,7 @@ LABEL(gobble_ashr_9):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1399,7 +1444,7 @@ LABEL(gobble_ashr_9):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1415,7 +1460,7 @@ LABEL(nibble_ashr_9):
 	test	$0xfe00, %edx
 	jnz	LABEL(ashr_9_exittail)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	$6, %r11
 	jbe	LABEL(ashr_9_exittail)
 # endif
@@ -1493,7 +1538,7 @@ LABEL(gobble_ashr_10):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1524,7 +1569,7 @@ LABEL(gobble_ashr_10):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1540,7 +1585,7 @@ LABEL(nibble_ashr_10):
 	test	$0xfc00, %edx
 	jnz	LABEL(ashr_10_exittail)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	$5, %r11
 	jbe	LABEL(ashr_10_exittail)
 # endif
@@ -1618,7 +1663,7 @@ LABEL(gobble_ashr_11):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1649,7 +1694,7 @@ LABEL(gobble_ashr_11):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1665,7 +1710,7 @@ LABEL(nibble_ashr_11):
 	test	$0xf800, %edx
 	jnz	LABEL(ashr_11_exittail)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	$4, %r11
 	jbe	LABEL(ashr_11_exittail)
 # endif
@@ -1743,7 +1788,7 @@ LABEL(gobble_ashr_12):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1774,7 +1819,7 @@ LABEL(gobble_ashr_12):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1790,7 +1835,7 @@ LABEL(nibble_ashr_12):
 	test	$0xf000, %edx
 	jnz	LABEL(ashr_12_exittail)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	$3, %r11
 	jbe	LABEL(ashr_12_exittail)
 # endif
@@ -1868,7 +1913,7 @@ LABEL(gobble_ashr_13):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1899,7 +1944,7 @@ LABEL(gobble_ashr_13):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -1915,7 +1960,7 @@ LABEL(nibble_ashr_13):
 	test	$0xe000, %edx
 	jnz	LABEL(ashr_13_exittail)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	$2, %r11
 	jbe	LABEL(ashr_13_exittail)
 # endif
@@ -1993,7 +2038,7 @@ LABEL(gobble_ashr_14):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -2024,7 +2069,7 @@ LABEL(gobble_ashr_14):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP | defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -2040,7 +2085,7 @@ LABEL(nibble_ashr_14):
 	test	$0xc000, %edx
 	jnz	LABEL(ashr_14_exittail)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	cmp	$1, %r11
 	jbe	LABEL(ashr_14_exittail)
 # endif
@@ -2120,7 +2165,7 @@ LABEL(gobble_ashr_15):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -2151,7 +2196,7 @@ LABEL(gobble_ashr_15):
 	sub	$0xffff, %edx
 	jnz	LABEL(exit)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	$16, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
@@ -2167,7 +2212,7 @@ LABEL(nibble_ashr_15):
 	test	$0x8000, %edx
 	jnz	LABEL(ashr_15_exittail)
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	test	%r11, %r11
 	je	LABEL(ashr_15_exittail)
 # endif
@@ -2205,14 +2250,14 @@ LABEL(ret):
 LABEL(less16bytes):
 	bsf	%rdx, %rdx		/* find and store bit index in %rdx */
 
-# ifdef USE_AS_STRNCMP
+# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
 	sub	%rdx, %r11
 	jbe	LABEL(strcmp_exitz)
 # endif
 	movzbl	(%rsi, %rdx), %ecx
 	movzbl	(%rdi, %rdx), %eax
 
-# ifdef USE_AS_STRCASECMP_L
+# if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
 	leaq	_nl_C_LC_CTYPE_tolower+128*4(%rip), %rdx
 	movl	(%rdx,%rcx,4), %ecx
 	movl	(%rdx,%rax,4), %eax
@@ -2230,6 +2275,12 @@ LABEL(Byte0):
 	movzx	(%rsi), %ecx
 	movzx	(%rdi), %eax
 
+# if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
+	leaq	_nl_C_LC_CTYPE_tolower+128*4(%rip), %rdx
+	movl	(%rdx,%rcx,4), %ecx
+	movl	(%rdx,%rax,4), %eax
+# endif
+
 	sub	%ecx, %eax
 	ret
 END (BP_SYM (STRCMP))
diff --git a/sysdeps/x86_64/strncase.S b/sysdeps/x86_64/strncase.S
new file mode 100644
index 0000000000..2de2ce4b96
--- /dev/null
+++ b/sysdeps/x86_64/strncase.S
@@ -0,0 +1 @@
+/* In strncase_l.S.  */
diff --git a/sysdeps/x86_64/strncase_l-nonascii.c b/sysdeps/x86_64/strncase_l-nonascii.c
new file mode 100644
index 0000000000..baabd318bf
--- /dev/null
+++ b/sysdeps/x86_64/strncase_l-nonascii.c
@@ -0,0 +1,8 @@
+#include <string.h>
+
+extern int __strncasecmp_l_nonascii (__const char *__s1, __const char *__s2,
+				     size_t __n, __locale_t __loc);
+
+#define __strncasecmp_l __strncasecmp_l_nonascii
+#define USE_IN_EXTENDED_LOCALE_MODEL    1
+#include <string/strncase.c>
diff --git a/sysdeps/x86_64/strncase_l.S b/sysdeps/x86_64/strncase_l.S
new file mode 100644
index 0000000000..c725cd85b3
--- /dev/null
+++ b/sysdeps/x86_64/strncase_l.S
@@ -0,0 +1,6 @@
+#define STRCMP __strncasecmp_l
+#define USE_AS_STRNCASECMP_L
+#include "strcmp.S"
+
+weak_alias (__strncasecmp_l, strncasecmp_l)
+libc_hidden_def (strncasecmp_l)