Add optimized x86-64 wcscmp

3 files changed, 940 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index cb3b046816..3d10ec2d42 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2011-08-29  Liubov Dmitrieva  <liubov.dmitrieva@gmail.com>
 
+	* sysdeps/x86_64/wcscmp.S: New file.
+
 	* sysdeps/i386/i686/multiarch/Makefile: (sysdep_routines): Add
 	wcscmp-c wcscmp-sse2
 	* sysdeps/i386/i686/multiarch/wcscmp-c.c: New file.
diff --git a/NEWS b/NEWS
index 43f979fccd..5e407f67de 100644
--- a/NEWS
+++ b/NEWS
@@ -25,7 +25,8 @@ Version 2.15
 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
   Contributed by HJ Lu.
 
-* Optimized strcat and strncat on x86-64 and optimized wcscmp on x86-32.
+* Optimized strcat and strncat on x86-64 and optimized wcscmp on x86-32 and
+  x86-64.
   Contributed by Liubov Dmitrieva.
 
 * New interfaces: scandirat, scandirat64
diff --git a/sysdeps/x86_64/wcscmp.S b/sysdeps/x86_64/wcscmp.S
new file mode 100644
index 0000000000..14dcab8c89
--- /dev/null
+++ b/sysdeps/x86_64/wcscmp.S
@@ -0,0 +1,936 @@
+/* Optimized wcscmp for x86-64 with SSE2.
+   Copyright (C) 2011 Free Software Foundation, Inc.
+   Contributed by Intel Corporation.
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sysdep.h>
+#include <init-arch.h>
+
+/* Define multiple versions only for the definition in libc and for
+   the DSO.  In static binaries we need wcscmp before the initialization
+   happened.  */
+
+	.text
+ENTRY (wcscmp)
+/*
+	* This implementation uses SSE to compare up to 16 bytes at a time.
+*/
+	mov	%esi, %eax
+	mov	%edi, %edx
+	pxor	%xmm0, %xmm0		/* clear %xmm0 for null char checks */
+	mov	%al, %ch
+	mov	%dl, %cl
+	and	$63, %eax		/* rsi alignment in cache line */
+	and	$63, %edx		/* rdi alignment in cache line */
+	and	$15, %cl
+	jz	L(continue_00)
+	cmp	$16, %edx
+	jb	L(continue_0)
+	cmp	$32, %edx
+	jb	L(continue_16)
+	cmp	$48, %edx
+	jb	L(continue_32)
+
+L(continue_48):
+	and	$15, %ch
+	jz	L(continue_48_00)
+	cmp	$16, %eax
+	jb	L(continue_0_48)
+	cmp	$32, %eax
+	jb	L(continue_16_48)
+	cmp	$48, %eax
+	jb	L(continue_32_48)
+
+	.p2align 4
+L(continue_48_48):
+	mov	(%rsi), %ecx
+	cmp	%ecx, (%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	4(%rsi), %ecx
+	cmp	%ecx, 4(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	8(%rsi), %ecx
+	cmp	%ecx, 8(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	12(%rsi), %ecx
+	cmp	%ecx, 12(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	movdqu	16(%rdi), %xmm1
+	movdqu	16(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_16)
+
+	movdqu	32(%rdi), %xmm1
+	movdqu	32(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_32)
+
+	movdqu	48(%rdi), %xmm1
+	movdqu	48(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_48)
+
+	add	$64, %rsi
+	add	$64, %rdi
+	jmp	L(continue_48_48)
+
+L(continue_0):
+	and	$15, %ch
+	jz	L(continue_0_00)
+	cmp	$16, %eax
+	jb	L(continue_0_0)
+	cmp	$32, %eax
+	jb	L(continue_0_16)
+	cmp	$48, %eax
+	jb	L(continue_0_32)
+
+	.p2align 4
+L(continue_0_48):
+	mov	(%rsi), %ecx
+	cmp	%ecx, (%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	4(%rsi), %ecx
+	cmp	%ecx, 4(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	8(%rsi), %ecx
+	cmp	%ecx, 8(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	12(%rsi), %ecx
+	cmp	%ecx, 12(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	movdqu	16(%rdi), %xmm1
+	movdqu	16(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_16)
+
+	movdqu	32(%rdi), %xmm1
+	movdqu	32(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_32)
+
+	mov	48(%rsi), %ecx
+	cmp	%ecx, 48(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	52(%rsi), %ecx
+	cmp	%ecx, 52(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	56(%rsi), %ecx
+	cmp	%ecx, 56(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	60(%rsi), %ecx
+	cmp	%ecx, 60(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	add	$64, %rsi
+	add	$64, %rdi
+	jmp	L(continue_0_48)
+
+	.p2align 4
+L(continue_00):
+	and	$15, %ch
+	jz	L(continue_00_00)
+	cmp	$16, %eax
+	jb	L(continue_00_0)
+	cmp	$32, %eax
+	jb	L(continue_00_16)
+	cmp	$48, %eax
+	jb	L(continue_00_32)
+
+	.p2align 4
+L(continue_00_48):
+	pcmpeqd	(%rdi), %xmm0
+	mov	(%rdi), %eax
+	pmovmskb %xmm0, %ecx
+	test	%ecx, %ecx
+	jnz	L(less4_double_words1)
+
+	sub	(%rsi), %eax
+	jnz	L(return)
+
+	mov	4(%rdi), %eax
+	sub	4(%rsi), %eax
+	jnz	L(return)
+
+	mov	8(%rdi), %eax
+	sub	8(%rsi), %eax
+	jnz	L(return)
+
+	mov	12(%rdi), %eax
+	sub	12(%rsi), %eax
+	jnz	L(return)
+
+	movdqu	16(%rsi), %xmm2
+	pcmpeqd	%xmm2, %xmm0		/* Any null double_word? */
+	pcmpeqd	16(%rdi), %xmm2		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm2		/* packed sub of comparison results*/
+	pmovmskb %xmm2, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_16)
+
+	movdqu	32(%rsi), %xmm2
+	pcmpeqd	%xmm2, %xmm0		/* Any null double_word? */
+	pcmpeqd	32(%rdi), %xmm2		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm2		/* packed sub of comparison results*/
+	pmovmskb %xmm2, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_32)
+
+	movdqu	48(%rsi), %xmm2
+	pcmpeqd	%xmm2, %xmm0		/* Any null double_word? */
+	pcmpeqd	48(%rdi), %xmm2		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm2		/* packed sub of comparison results*/
+	pmovmskb %xmm2, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_48)
+
+	add	$64, %rsi
+	add	$64, %rdi
+	jmp	L(continue_00_48)
+
+	.p2align 4
+L(continue_32):
+	and	$15, %ch
+	jz	L(continue_32_00)
+	cmp	$16, %eax
+	jb	L(continue_0_32)
+	cmp	$32, %eax
+	jb	L(continue_16_32)
+	cmp	$48, %eax
+	jb	L(continue_32_32)
+
+	.p2align 4
+L(continue_32_48):
+	mov	(%rsi), %ecx
+	cmp	%ecx, (%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	4(%rsi), %ecx
+	cmp	%ecx, 4(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	8(%rsi), %ecx
+	cmp	%ecx, 8(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	12(%rsi), %ecx
+	cmp	%ecx, 12(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	16(%rsi), %ecx
+	cmp	%ecx, 16(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	20(%rsi), %ecx
+	cmp	%ecx, 20(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	24(%rsi), %ecx
+	cmp	%ecx, 24(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	28(%rsi), %ecx
+	cmp	%ecx, 28(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	movdqu	32(%rdi), %xmm1
+	movdqu	32(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_32)
+
+	movdqu	48(%rdi), %xmm1
+	movdqu	48(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_48)
+
+	add	$64, %rsi
+	add	$64, %rdi
+	jmp	L(continue_32_48)
+
+	.p2align 4
+L(continue_16):
+	and	$15, %ch
+	jz	L(continue_16_00)
+	cmp	$16, %eax
+	jb	L(continue_0_16)
+	cmp	$32, %eax
+	jb	L(continue_16_16)
+	cmp	$48, %eax
+	jb	L(continue_16_32)
+
+	.p2align 4
+L(continue_16_48):
+	mov	(%rsi), %ecx
+	cmp	%ecx, (%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	4(%rsi), %ecx
+	cmp	%ecx, 4(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	8(%rsi), %ecx
+	cmp	%ecx, 8(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	12(%rsi), %ecx
+	cmp	%ecx, 12(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	movdqu	16(%rdi), %xmm1
+	movdqu	16(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_16)
+
+	mov	32(%rsi), %ecx
+	cmp	%ecx, 32(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	36(%rsi), %ecx
+	cmp	%ecx, 36(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	40(%rsi), %ecx
+	cmp	%ecx, 40(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	44(%rsi), %ecx
+	cmp	%ecx, 44(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	movdqu	48(%rdi), %xmm1
+	movdqu	48(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_48)
+
+	add	$64, %rsi
+	add	$64, %rdi
+	jmp	L(continue_16_48)
+
+	.p2align 4
+L(continue_00_00):
+	movdqa	(%rdi), %xmm1
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	(%rsi), %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words)
+
+	movdqa	16(%rdi), %xmm3
+	pcmpeqd	%xmm3, %xmm0		/* Any null double_word? */
+	pcmpeqd	16(%rsi), %xmm3		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm3		/* packed sub of comparison results*/
+	pmovmskb %xmm3, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_16)
+
+	movdqa	32(%rdi), %xmm5
+	pcmpeqd	%xmm5, %xmm0		/* Any null double_word? */
+	pcmpeqd	32(%rsi), %xmm5		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm5		/* packed sub of comparison results*/
+	pmovmskb %xmm5, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_32)
+
+	movdqa	48(%rdi), %xmm1
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	48(%rsi), %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_48)
+
+	add	$64, %rsi
+	add	$64, %rdi
+	jmp	L(continue_00_00)
+
+	.p2align 4
+L(continue_00_32):
+	movdqu	(%rsi), %xmm2
+	pcmpeqd	%xmm2, %xmm0		/* Any null double_word? */
+	pcmpeqd	(%rdi), %xmm2		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm2		/* packed sub of comparison results*/
+	pmovmskb %xmm2, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words)
+
+	add	$16, %rsi
+	add	$16, %rdi
+	jmp	L(continue_00_48)
+
+	.p2align 4
+L(continue_00_16):
+	movdqu	(%rsi), %xmm2
+	pcmpeqd	%xmm2, %xmm0		/* Any null double_word? */
+	pcmpeqd	(%rdi), %xmm2		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm2		/* packed sub of comparison results*/
+	pmovmskb %xmm2, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words)
+
+	movdqu	16(%rsi), %xmm2
+	pcmpeqd	%xmm2, %xmm0		/* Any null double_word? */
+	pcmpeqd	16(%rdi), %xmm2		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm2		/* packed sub of comparison results*/
+	pmovmskb %xmm2, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_16)
+
+	add	$32, %rsi
+	add	$32, %rdi
+	jmp	L(continue_00_48)
+
+	.p2align 4
+L(continue_00_0):
+	movdqu	(%rsi), %xmm2
+	pcmpeqd	%xmm2, %xmm0		/* Any null double_word? */
+	pcmpeqd	(%rdi), %xmm2		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm2		/* packed sub of comparison results*/
+	pmovmskb %xmm2, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words)
+
+	movdqu	16(%rsi), %xmm2
+	pcmpeqd	%xmm2, %xmm0		/* Any null double_word? */
+	pcmpeqd	16(%rdi), %xmm2		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm2		/* packed sub of comparison results*/
+	pmovmskb %xmm2, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_16)
+
+	movdqu	32(%rsi), %xmm2
+	pcmpeqd	%xmm2, %xmm0		/* Any null double_word? */
+	pcmpeqd	32(%rdi), %xmm2		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm2		/* packed sub of comparison results*/
+	pmovmskb %xmm2, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_32)
+
+	add	$48, %rsi
+	add	$48, %rdi
+	jmp	L(continue_00_48)
+
+	.p2align 4
+L(continue_48_00):
+	pcmpeqd	(%rsi), %xmm0
+	mov	(%rdi), %eax
+	pmovmskb %xmm0, %ecx
+	test	%ecx, %ecx
+	jnz	L(less4_double_words1)
+
+	sub	(%rsi), %eax
+	jnz	L(return)
+
+	mov	4(%rdi), %eax
+	sub	4(%rsi), %eax
+	jnz	L(return)
+
+	mov	8(%rdi), %eax
+	sub	8(%rsi), %eax
+	jnz	L(return)
+
+	mov	12(%rdi), %eax
+	sub	12(%rsi), %eax
+	jnz	L(return)
+
+	movdqu	16(%rdi), %xmm1
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	16(%rsi), %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_16)
+
+	movdqu	32(%rdi), %xmm1
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	32(%rsi), %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_32)
+
+	movdqu	48(%rdi), %xmm1
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	48(%rsi), %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_48)
+
+	add	$64, %rsi
+	add	$64, %rdi
+	jmp	L(continue_48_00)
+
+	.p2align 4
+L(continue_32_00):
+	movdqu	(%rdi), %xmm1
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	(%rsi), %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words)
+
+	add	$16, %rsi
+	add	$16, %rdi
+	jmp	L(continue_48_00)
+
+	.p2align 4
+L(continue_16_00):
+	movdqu	(%rdi), %xmm1
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	(%rsi), %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words)
+
+	movdqu	16(%rdi), %xmm1
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	16(%rsi), %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_16)
+
+	add	$32, %rsi
+	add	$32, %rdi
+	jmp	L(continue_48_00)
+
+	.p2align 4
+L(continue_0_00):
+	movdqu	(%rdi), %xmm1
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	(%rsi), %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words)
+
+	movdqu	16(%rdi), %xmm1
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	16(%rsi), %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_16)
+
+	movdqu	32(%rdi), %xmm1
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	32(%rsi), %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_32)
+
+	add	$48, %rsi
+	add	$48, %rdi
+	jmp	L(continue_48_00)
+
+	.p2align 4
+L(continue_32_32):
+	movdqu	(%rdi), %xmm1
+	movdqu	(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words)
+
+	add	$16, %rsi
+	add	$16, %rdi
+	jmp	L(continue_48_48)
+
+	.p2align 4
+L(continue_16_16):
+	movdqu	(%rdi), %xmm1
+	movdqu	(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words)
+
+	movdqu	16(%rdi), %xmm3
+	movdqu	16(%rsi), %xmm4
+	pcmpeqd	%xmm3, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm4, %xmm3		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm3		/* packed sub of comparison results*/
+	pmovmskb %xmm3, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_16)
+
+	add	$32, %rsi
+	add	$32, %rdi
+	jmp	L(continue_48_48)
+
+	.p2align 4
+L(continue_0_0):
+	movdqu	(%rdi), %xmm1
+	movdqu	(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words)
+
+	movdqu	16(%rdi), %xmm3
+	movdqu	16(%rsi), %xmm4
+	pcmpeqd	%xmm3, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm4, %xmm3		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm3		/* packed sub of comparison results*/
+	pmovmskb %xmm3, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_16)
+
+	movdqu	32(%rdi), %xmm1
+	movdqu	32(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_32)
+
+	add	$48, %rsi
+	add	$48, %rdi
+	jmp	L(continue_48_48)
+
+	.p2align 4
+L(continue_0_16):
+	movdqu	(%rdi), %xmm1
+	movdqu	(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words)
+
+	movdqu	16(%rdi), %xmm1
+	movdqu	16(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words_16)
+
+	add	$32, %rsi
+	add	$32, %rdi
+	jmp	L(continue_32_48)
+
+	.p2align 4
+L(continue_0_32):
+	movdqu	(%rdi), %xmm1
+	movdqu	(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words)
+
+	add	$16, %rsi
+	add	$16, %rdi
+	jmp	L(continue_16_48)
+
+	.p2align 4
+L(continue_16_32):
+	movdqu	(%rdi), %xmm1
+	movdqu	(%rsi), %xmm2
+	pcmpeqd	%xmm1, %xmm0		/* Any null double_word? */
+	pcmpeqd	%xmm2, %xmm1		/* compare first 4 double_words for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %edx
+	sub	$0xffff, %edx		/* if first 4 double_words are same, edx == 0xffff */
+	jnz	L(less4_double_words)
+
+	add	$16, %rsi
+	add	$16, %rdi
+	jmp	L(continue_32_48)
+
+	.p2align 4
+L(less4_double_words1):
+	cmp	(%rsi), %eax
+	jne	L(nequal)
+	test	%eax, %eax
+	jz	L(equal)
+
+	mov	4(%rsi), %ecx
+	cmp	%ecx, 4(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	8(%rsi), %ecx
+	cmp	%ecx, 8(%rdi)
+	jne	L(nequal)
+	test	%ecx, %ecx
+	jz	L(equal)
+
+	mov	12(%rsi), %edx
+	mov	12(%rdi), %eax
+	sub	%edx, %eax
+	ret
+
+	.p2align 4
+L(less4_double_words):
+	test	%dl, %dl
+	jz	L(next_two_double_words)
+	and	$15, %dl
+	jz	L(second_double_word)
+	mov	(%rdi), %eax
+	sub	(%rsi), %eax
+	ret
+
+	.p2align 4
+L(second_double_word):
+	mov	4(%rdi), %eax
+	sub	4(%rsi), %eax
+	ret
+
+	.p2align 4
+L(next_two_double_words):
+	and	$15, %dh
+	jz	L(fourth_double_word)
+	mov	8(%rdi), %eax
+	sub	8(%rsi), %eax
+	ret
+
+	.p2align 4
+L(fourth_double_word):
+	mov	12(%rdi), %eax
+	sub	12(%rsi), %eax
+	ret
+
+	.p2align 4
+L(less4_double_words_16):
+	test	%dl, %dl
+	jz	L(next_two_double_words_16)
+	and	$15, %dl
+	jz	L(second_double_word_16)
+	mov	16(%rdi), %eax
+	sub	16(%rsi), %eax
+	ret
+
+	.p2align 4
+L(second_double_word_16):
+	mov	20(%rdi), %eax
+	sub	20(%rsi), %eax
+	ret
+
+	.p2align 4
+L(next_two_double_words_16):
+	and	$15, %dh
+	jz	L(fourth_double_word_16)
+	mov	24(%rdi), %eax
+	sub	24(%rsi), %eax
+	ret
+
+	.p2align 4
+L(fourth_double_word_16):
+	mov	28(%rdi), %eax
+	sub	28(%rsi), %eax
+	ret
+
+	.p2align 4
+L(less4_double_words_32):
+	test	%dl, %dl
+	jz	L(next_two_double_words_32)
+	and	$15, %dl
+	jz	L(second_double_word_32)
+	mov	32(%rdi), %eax
+	sub	32(%rsi), %eax
+	ret
+
+	.p2align 4
+L(second_double_word_32):
+	mov	36(%rdi), %eax
+	sub	36(%rsi), %eax
+	ret
+
+	.p2align 4
+L(next_two_double_words_32):
+	and	$15, %dh
+	jz	L(fourth_double_word_32)
+	mov	40(%rdi), %eax
+	sub	40(%rsi), %eax
+	ret
+
+	.p2align 4
+L(fourth_double_word_32):
+	mov	44(%rdi), %eax
+	sub	44(%rsi), %eax
+	ret
+
+	.p2align 4
+L(less4_double_words_48):
+	test	%dl, %dl
+	jz	L(next_two_double_words_48)
+	and	$15, %dl
+	jz	L(second_double_word_48)
+	mov	48(%rdi), %eax
+	sub	48(%rsi), %eax
+	ret
+
+	.p2align 4
+L(second_double_word_48):
+	mov	52(%rdi), %eax
+	sub	52(%rsi), %eax
+	ret
+
+	.p2align 4
+L(next_two_double_words_48):
+	and	$15, %dh
+	jz	L(fourth_double_word_48)
+	mov	56(%rdi), %eax
+	sub	56(%rsi), %eax
+	ret
+
+	.p2align 4
+L(fourth_double_word_48):
+	mov	60(%rdi), %eax
+	sub	60(%rsi), %eax
+	ret
+
+	.p2align 4
+L(return):
+	ret
+
+	.p2align 4
+L(nequal):
+	mov	$1, %eax
+	ja	L(nequal_bigger)
+	neg	%eax
+
+L(nequal_bigger):
+	ret
+
+	.p2align 4
+L(equal):
+	xor	%rax, %rax
+	ret
+
+END (wcscmp)
+libc_hidden_def (wcscmp)