Optimized memcmp and wmemcmp for x86-64 and x86-32

1 files changed, 1997 insertions, 0 deletions

diff --git a/sysdeps/x86_64/multiarch/memcmp-ssse3.S b/sysdeps/x86_64/multiarch/memcmp-ssse3.S
new file mode 100644
index 0000000000..b3a2ca1edd
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/memcmp-ssse3.S
@@ -0,0 +1,1997 @@
+/* memcmp with SSSE3, wmemcmp with SSSE3
+   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.  */
+
+#ifndef NOT_IN_libc
+
+# include <sysdep.h>
+
+# ifndef MEMCMP
+#  define MEMCMP	__memcmp_ssse3
+# endif
+
+# ifndef ALIGN
+#  define ALIGN(n)	.p2align n
+# endif
+
+/* Warning!
+           wmemcmp has to use SIGNED comparison for elements.
+           memcmp has to use UNSIGNED comparison for elemnts.
+*/
+
+	atom_text_section
+ENTRY (MEMCMP)
+# ifdef USE_AS_WMEMCMP
+	shl	$2, %rdx
+	test	%rdx, %rdx
+	jz	L(equal)
+# endif
+	mov	%rdx, %rcx
+	mov	%rdi, %rdx
+	cmp	$48, %rcx;
+	jae	L(48bytesormore)	/* LEN => 48  */
+
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+/* ECX >= 32.  */
+L(48bytesormore):
+	movdqu	(%rdi), %xmm3
+	movdqu	(%rsi), %xmm0
+	pcmpeqb	%xmm0, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	16(%rdi), %rdi
+	lea	16(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(less16bytes)
+	mov	%edi, %edx
+	and	$0xf, %edx
+	xor	%rdx, %rdi
+	sub	%rdx, %rsi
+	add	%rdx, %rcx
+	mov	%esi, %edx
+	and	$0xf, %edx
+	jz	L(shr_0)
+	xor	%rdx, %rsi
+
+# ifndef USE_AS_WMEMCMP
+	cmp	$8, %edx
+	jae	L(next_unaligned_table)
+	cmp	$0, %edx
+	je	L(shr_0)
+	cmp	$1, %edx
+	je	L(shr_1)
+	cmp	$2, %edx
+	je	L(shr_2)
+	cmp	$3, %edx
+	je	L(shr_3)
+	cmp	$4, %edx
+	je	L(shr_4)
+	cmp	$5, %edx
+	je	L(shr_5)
+	cmp	$6, %edx
+	je	L(shr_6)
+	jmp	L(shr_7)
+
+	ALIGN	(2)
+L(next_unaligned_table):
+	cmp	$8, %edx
+	je	L(shr_8)
+	cmp	$9, %edx
+	je	L(shr_9)
+	cmp	$10, %edx
+	je	L(shr_10)
+	cmp	$11, %edx
+	je	L(shr_11)
+	cmp	$12, %edx
+	je	L(shr_12)
+	cmp	$13, %edx
+	je	L(shr_13)
+	cmp	$14, %edx
+	je	L(shr_14)
+	jmp	L(shr_15)
+# else
+	cmp	$0, %edx
+	je	L(shr_0)
+	cmp	$4, %edx
+	je	L(shr_4)
+	cmp	$8, %edx
+	je	L(shr_8)
+	jmp	L(shr_12)
+# endif
+
+	ALIGN	(4)
+L(shr_0):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	jae	L(shr_0_gobble)
+	xor	%eax, %eax
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+	movdqa	16(%rsi), %xmm2
+	pcmpeqb	16(%rdi), %xmm2
+	pand	%xmm1, %xmm2
+	pmovmskb %xmm2, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_0_gobble):
+	movdqa	(%rsi), %xmm0
+	xor	%eax, %eax
+	pcmpeqb	(%rdi), %xmm0
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm2
+	pcmpeqb	16(%rdi), %xmm2
+L(shr_0_gobble_loop):
+	pand	%xmm0, %xmm2
+	sub	$32, %rcx
+	pmovmskb %xmm2, %edx
+	movdqa	%xmm0, %xmm1
+	movdqa	32(%rsi), %xmm0
+	movdqa	48(%rsi), %xmm2
+	sbb	$0xffff, %edx
+	pcmpeqb	32(%rdi), %xmm0
+	pcmpeqb	48(%rdi), %xmm2
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	jz	L(shr_0_gobble_loop)
+
+	pand	%xmm0, %xmm2
+	cmp	$0, %rcx
+	jge	L(next)
+	inc	%edx
+	add	$32, %rcx
+L(next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm2, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+# ifndef USE_AS_WMEMCMP
+
+	ALIGN	(4)
+L(shr_1):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	mov	%edx, %eax
+	jae	L(shr_1_gobble)
+
+	movdqa	16(%rsi), %xmm1
+	movdqa	%xmm1, %xmm2
+	palignr	$1, (%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$1, %xmm2, %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+	pand	%xmm1, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	$1, %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_1_gobble):
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm0
+	palignr	$1, (%rsi), %xmm0
+	pcmpeqb	(%rdi), %xmm0
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$1, 16(%rsi), %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+L(shr_1_gobble_loop):
+	pand	%xmm0, %xmm3
+	sub	$32, %rcx
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+
+	movdqa	64(%rsi), %xmm3
+	palignr	$1, 48(%rsi), %xmm3
+	sbb	$0xffff, %edx
+	movdqa	48(%rsi), %xmm0
+	palignr	$1, 32(%rsi), %xmm0
+	pcmpeqb	32(%rdi), %xmm0
+	lea	32(%rsi), %rsi
+	pcmpeqb	48(%rdi), %xmm3
+
+	lea	32(%rdi), %rdi
+	jz	L(shr_1_gobble_loop)
+	pand	%xmm0, %xmm3
+
+	cmp	$0, %rcx
+	jge	L(shr_1_gobble_next)
+	inc	%edx
+	add	$32, %rcx
+L(shr_1_gobble_next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+
+	lea	1(%rsi), %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+
+	ALIGN	(4)
+L(shr_2):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	mov	%edx, %eax
+	jae	L(shr_2_gobble)
+
+	movdqa	16(%rsi), %xmm1
+	movdqa	%xmm1, %xmm2
+	palignr	$2, (%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$2, %xmm2, %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+	pand	%xmm1, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	$2, %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_2_gobble):
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm0
+	palignr	$2, (%rsi), %xmm0
+	pcmpeqb	(%rdi), %xmm0
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$2, 16(%rsi), %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+L(shr_2_gobble_loop):
+	pand	%xmm0, %xmm3
+	sub	$32, %rcx
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+
+	movdqa	64(%rsi), %xmm3
+	palignr	$2, 48(%rsi), %xmm3
+	sbb	$0xffff, %edx
+	movdqa	48(%rsi), %xmm0
+	palignr	$2, 32(%rsi), %xmm0
+	pcmpeqb	32(%rdi), %xmm0
+	lea	32(%rsi), %rsi
+	pcmpeqb	48(%rdi), %xmm3
+
+	lea	32(%rdi), %rdi
+	jz	L(shr_2_gobble_loop)
+	pand	%xmm0, %xmm3
+
+	cmp	$0, %rcx
+	jge	L(shr_2_gobble_next)
+	inc	%edx
+	add	$32, %rcx
+L(shr_2_gobble_next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+
+	lea	2(%rsi), %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_3):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	mov	%edx, %eax
+	jae	L(shr_3_gobble)
+
+	movdqa	16(%rsi), %xmm1
+	movdqa	%xmm1, %xmm2
+	palignr	$3, (%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$3, %xmm2, %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+	pand	%xmm1, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	$3, %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_3_gobble):
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm0
+	palignr	$3, (%rsi), %xmm0
+	pcmpeqb	(%rdi), %xmm0
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$3, 16(%rsi), %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+L(shr_3_gobble_loop):
+	pand	%xmm0, %xmm3
+	sub	$32, %rcx
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+
+	movdqa	64(%rsi), %xmm3
+	palignr	$3, 48(%rsi), %xmm3
+	sbb	$0xffff, %edx
+	movdqa	48(%rsi), %xmm0
+	palignr	$3, 32(%rsi), %xmm0
+	pcmpeqb	32(%rdi), %xmm0
+	lea	32(%rsi), %rsi
+	pcmpeqb	48(%rdi), %xmm3
+
+	lea	32(%rdi), %rdi
+	jz	L(shr_3_gobble_loop)
+	pand	%xmm0, %xmm3
+
+	cmp	$0, %rcx
+	jge	L(shr_3_gobble_next)
+	inc	%edx
+	add	$32, %rcx
+L(shr_3_gobble_next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+
+	lea	3(%rsi), %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+# endif
+
+	ALIGN	(4)
+L(shr_4):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	mov	%edx, %eax
+	jae	L(shr_4_gobble)
+
+	movdqa	16(%rsi), %xmm1
+	movdqa	%xmm1, %xmm2
+	palignr	$4, (%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$4, %xmm2, %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+	pand	%xmm1, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	$4, %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_4_gobble):
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm0
+	palignr	$4, (%rsi), %xmm0
+	pcmpeqb	(%rdi), %xmm0
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$4, 16(%rsi), %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+L(shr_4_gobble_loop):
+	pand	%xmm0, %xmm3
+	sub	$32, %rcx
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+
+	movdqa	64(%rsi), %xmm3
+	palignr	$4, 48(%rsi), %xmm3
+	sbb	$0xffff, %edx
+	movdqa	48(%rsi), %xmm0
+	palignr	$4, 32(%rsi), %xmm0
+	pcmpeqb	32(%rdi), %xmm0
+	lea	32(%rsi), %rsi
+	pcmpeqb	48(%rdi), %xmm3
+
+	lea	32(%rdi), %rdi
+	jz	L(shr_4_gobble_loop)
+	pand	%xmm0, %xmm3
+
+	cmp	$0, %rcx
+	jge	L(shr_4_gobble_next)
+	inc	%edx
+	add	$32, %rcx
+L(shr_4_gobble_next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+
+	lea	4(%rsi), %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+# ifndef USE_AS_WMEMCMP
+
+	ALIGN	(4)
+L(shr_5):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	mov	%edx, %eax
+	jae	L(shr_5_gobble)
+
+	movdqa	16(%rsi), %xmm1
+	movdqa	%xmm1, %xmm2
+	palignr	$5, (%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$5, %xmm2, %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+	pand	%xmm1, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	$5, %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_5_gobble):
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm0
+	palignr	$5, (%rsi), %xmm0
+	pcmpeqb	(%rdi), %xmm0
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$5, 16(%rsi), %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+L(shr_5_gobble_loop):
+	pand	%xmm0, %xmm3
+	sub	$32, %rcx
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+
+	movdqa	64(%rsi), %xmm3
+	palignr	$5, 48(%rsi), %xmm3
+	sbb	$0xffff, %edx
+	movdqa	48(%rsi), %xmm0
+	palignr	$5, 32(%rsi), %xmm0
+	pcmpeqb	32(%rdi), %xmm0
+	lea	32(%rsi), %rsi
+	pcmpeqb	48(%rdi), %xmm3
+
+	lea	32(%rdi), %rdi
+	jz	L(shr_5_gobble_loop)
+	pand	%xmm0, %xmm3
+
+	cmp	$0, %rcx
+	jge	L(shr_5_gobble_next)
+	inc	%edx
+	add	$32, %rcx
+L(shr_5_gobble_next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+
+	lea	5(%rsi), %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_6):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	mov	%edx, %eax
+	jae	L(shr_6_gobble)
+
+	movdqa	16(%rsi), %xmm1
+	movdqa	%xmm1, %xmm2
+	palignr	$6, (%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$6, %xmm2, %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+	pand	%xmm1, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	$6, %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_6_gobble):
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm0
+	palignr	$6, (%rsi), %xmm0
+	pcmpeqb	(%rdi), %xmm0
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$6, 16(%rsi), %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+L(shr_6_gobble_loop):
+	pand	%xmm0, %xmm3
+	sub	$32, %rcx
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+
+	movdqa	64(%rsi), %xmm3
+	palignr	$6, 48(%rsi), %xmm3
+	sbb	$0xffff, %edx
+	movdqa	48(%rsi), %xmm0
+	palignr	$6, 32(%rsi), %xmm0
+	pcmpeqb	32(%rdi), %xmm0
+	lea	32(%rsi), %rsi
+	pcmpeqb	48(%rdi), %xmm3
+
+	lea	32(%rdi), %rdi
+	jz	L(shr_6_gobble_loop)
+	pand	%xmm0, %xmm3
+
+	cmp	$0, %rcx
+	jge	L(shr_6_gobble_next)
+	inc	%edx
+	add	$32, %rcx
+L(shr_6_gobble_next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+
+	lea	6(%rsi), %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_7):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	mov	%edx, %eax
+	jae	L(shr_7_gobble)
+
+	movdqa	16(%rsi), %xmm1
+	movdqa	%xmm1, %xmm2
+	palignr	$7, (%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$7, %xmm2, %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+	pand	%xmm1, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	$7, %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_7_gobble):
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm0
+	palignr	$7, (%rsi), %xmm0
+	pcmpeqb	(%rdi), %xmm0
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$7, 16(%rsi), %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+L(shr_7_gobble_loop):
+	pand	%xmm0, %xmm3
+	sub	$32, %rcx
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+
+	movdqa	64(%rsi), %xmm3
+	palignr	$7, 48(%rsi), %xmm3
+	sbb	$0xffff, %edx
+	movdqa	48(%rsi), %xmm0
+	palignr	$7, 32(%rsi), %xmm0
+	pcmpeqb	32(%rdi), %xmm0
+	lea	32(%rsi), %rsi
+	pcmpeqb	48(%rdi), %xmm3
+
+	lea	32(%rdi), %rdi
+	jz	L(shr_7_gobble_loop)
+	pand	%xmm0, %xmm3
+
+	cmp	$0, %rcx
+	jge	L(shr_7_gobble_next)
+	inc	%edx
+	add	$32, %rcx
+L(shr_7_gobble_next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+
+	lea	7(%rsi), %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+# endif
+
+	ALIGN	(4)
+L(shr_8):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	mov	%edx, %eax
+	jae	L(shr_8_gobble)
+
+	movdqa	16(%rsi), %xmm1
+	movdqa	%xmm1, %xmm2
+	palignr	$8, (%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$8, %xmm2, %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+	pand	%xmm1, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	$8, %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_8_gobble):
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm0
+	palignr	$8, (%rsi), %xmm0
+	pcmpeqb	(%rdi), %xmm0
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$8, 16(%rsi), %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+L(shr_8_gobble_loop):
+	pand	%xmm0, %xmm3
+	sub	$32, %rcx
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+
+	movdqa	64(%rsi), %xmm3
+	palignr	$8, 48(%rsi), %xmm3
+	sbb	$0xffff, %edx
+	movdqa	48(%rsi), %xmm0
+	palignr	$8, 32(%rsi), %xmm0
+	pcmpeqb	32(%rdi), %xmm0
+	lea	32(%rsi), %rsi
+	pcmpeqb	48(%rdi), %xmm3
+
+	lea	32(%rdi), %rdi
+	jz	L(shr_8_gobble_loop)
+	pand	%xmm0, %xmm3
+
+	cmp	$0, %rcx
+	jge	L(shr_8_gobble_next)
+	inc	%edx
+	add	$32, %rcx
+L(shr_8_gobble_next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+
+	lea	8(%rsi), %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+# ifndef USE_AS_WMEMCMP
+
+	ALIGN	(4)
+L(shr_9):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	mov	%edx, %eax
+	jae	L(shr_9_gobble)
+
+	movdqa	16(%rsi), %xmm1
+	movdqa	%xmm1, %xmm2
+	palignr	$9, (%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$9, %xmm2, %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+	pand	%xmm1, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	$9, %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_9_gobble):
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm0
+	palignr	$9, (%rsi), %xmm0
+	pcmpeqb	(%rdi), %xmm0
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$9, 16(%rsi), %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+L(shr_9_gobble_loop):
+	pand	%xmm0, %xmm3
+	sub	$32, %rcx
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+
+	movdqa	64(%rsi), %xmm3
+	palignr	$9, 48(%rsi), %xmm3
+	sbb	$0xffff, %edx
+	movdqa	48(%rsi), %xmm0
+	palignr	$9, 32(%rsi), %xmm0
+	pcmpeqb	32(%rdi), %xmm0
+	lea	32(%rsi), %rsi
+	pcmpeqb	48(%rdi), %xmm3
+
+	lea	32(%rdi), %rdi
+	jz	L(shr_9_gobble_loop)
+	pand	%xmm0, %xmm3
+
+	cmp	$0, %rcx
+	jge	L(shr_9_gobble_next)
+	inc	%edx
+	add	$32, %rcx
+L(shr_9_gobble_next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+
+	lea	9(%rsi), %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_10):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	mov	%edx, %eax
+	jae	L(shr_10_gobble)
+
+	movdqa	16(%rsi), %xmm1
+	movdqa	%xmm1, %xmm2
+	palignr	$10, (%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$10, %xmm2, %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+	pand	%xmm1, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	$10, %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_10_gobble):
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm0
+	palignr	$10, (%rsi), %xmm0
+	pcmpeqb	(%rdi), %xmm0
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$10, 16(%rsi), %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+L(shr_10_gobble_loop):
+	pand	%xmm0, %xmm3
+	sub	$32, %rcx
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+
+	movdqa	64(%rsi), %xmm3
+	palignr	$10, 48(%rsi), %xmm3
+	sbb	$0xffff, %edx
+	movdqa	48(%rsi), %xmm0
+	palignr	$10, 32(%rsi), %xmm0
+	pcmpeqb	32(%rdi), %xmm0
+	lea	32(%rsi), %rsi
+	pcmpeqb	48(%rdi), %xmm3
+
+	lea	32(%rdi), %rdi
+	jz	L(shr_10_gobble_loop)
+	pand	%xmm0, %xmm3
+
+	cmp	$0, %rcx
+	jge	L(shr_10_gobble_next)
+	inc	%edx
+	add	$32, %rcx
+L(shr_10_gobble_next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+
+	lea	10(%rsi), %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_11):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	mov	%edx, %eax
+	jae	L(shr_11_gobble)
+
+	movdqa	16(%rsi), %xmm1
+	movdqa	%xmm1, %xmm2
+	palignr	$11, (%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$11, %xmm2, %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+	pand	%xmm1, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	$11, %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_11_gobble):
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm0
+	palignr	$11, (%rsi), %xmm0
+	pcmpeqb	(%rdi), %xmm0
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$11, 16(%rsi), %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+L(shr_11_gobble_loop):
+	pand	%xmm0, %xmm3
+	sub	$32, %rcx
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+
+	movdqa	64(%rsi), %xmm3
+	palignr	$11, 48(%rsi), %xmm3
+	sbb	$0xffff, %edx
+	movdqa	48(%rsi), %xmm0
+	palignr	$11, 32(%rsi), %xmm0
+	pcmpeqb	32(%rdi), %xmm0
+	lea	32(%rsi), %rsi
+	pcmpeqb	48(%rdi), %xmm3
+
+	lea	32(%rdi), %rdi
+	jz	L(shr_11_gobble_loop)
+	pand	%xmm0, %xmm3
+
+	cmp	$0, %rcx
+	jge	L(shr_11_gobble_next)
+	inc	%edx
+	add	$32, %rcx
+L(shr_11_gobble_next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+
+	lea	11(%rsi), %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+# endif
+
+	ALIGN	(4)
+L(shr_12):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	mov	%edx, %eax
+	jae	L(shr_12_gobble)
+
+	movdqa	16(%rsi), %xmm1
+	movdqa	%xmm1, %xmm2
+	palignr	$12, (%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$12, %xmm2, %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+	pand	%xmm1, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	$12, %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_12_gobble):
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm0
+	palignr	$12, (%rsi), %xmm0
+	pcmpeqb	(%rdi), %xmm0
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$12, 16(%rsi), %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+L(shr_12_gobble_loop):
+	pand	%xmm0, %xmm3
+	sub	$32, %rcx
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+
+	movdqa	64(%rsi), %xmm3
+	palignr	$12, 48(%rsi), %xmm3
+	sbb	$0xffff, %edx
+	movdqa	48(%rsi), %xmm0
+	palignr	$12, 32(%rsi), %xmm0
+	pcmpeqb	32(%rdi), %xmm0
+	lea	32(%rsi), %rsi
+	pcmpeqb	48(%rdi), %xmm3
+
+	lea	32(%rdi), %rdi
+	jz	L(shr_12_gobble_loop)
+	pand	%xmm0, %xmm3
+
+	cmp	$0, %rcx
+	jge	L(shr_12_gobble_next)
+	inc	%edx
+	add	$32, %rcx
+L(shr_12_gobble_next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+
+	lea	12(%rsi), %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+# ifndef USE_AS_WMEMCMP
+
+	ALIGN	(4)
+L(shr_13):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	mov	%edx, %eax
+	jae	L(shr_13_gobble)
+
+	movdqa	16(%rsi), %xmm1
+	movdqa	%xmm1, %xmm2
+	palignr	$13, (%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$13, %xmm2, %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+	pand	%xmm1, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	$13, %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_13_gobble):
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm0
+	palignr	$13, (%rsi), %xmm0
+	pcmpeqb	(%rdi), %xmm0
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$13, 16(%rsi), %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+L(shr_13_gobble_loop):
+	pand	%xmm0, %xmm3
+	sub	$32, %rcx
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+
+	movdqa	64(%rsi), %xmm3
+	palignr	$13, 48(%rsi), %xmm3
+	sbb	$0xffff, %edx
+	movdqa	48(%rsi), %xmm0
+	palignr	$13, 32(%rsi), %xmm0
+	pcmpeqb	32(%rdi), %xmm0
+	lea	32(%rsi), %rsi
+	pcmpeqb	48(%rdi), %xmm3
+
+	lea	32(%rdi), %rdi
+	jz	L(shr_13_gobble_loop)
+	pand	%xmm0, %xmm3
+
+	cmp	$0, %rcx
+	jge	L(shr_13_gobble_next)
+	inc	%edx
+	add	$32, %rcx
+L(shr_13_gobble_next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+
+	lea	13(%rsi), %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_14):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	mov	%edx, %eax
+	jae	L(shr_14_gobble)
+
+	movdqa	16(%rsi), %xmm1
+	movdqa	%xmm1, %xmm2
+	palignr	$14, (%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$14, %xmm2, %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+	pand	%xmm1, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	$14, %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_14_gobble):
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm0
+	palignr	$14, (%rsi), %xmm0
+	pcmpeqb	(%rdi), %xmm0
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$14, 16(%rsi), %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+L(shr_14_gobble_loop):
+	pand	%xmm0, %xmm3
+	sub	$32, %rcx
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+
+	movdqa	64(%rsi), %xmm3
+	palignr	$14, 48(%rsi), %xmm3
+	sbb	$0xffff, %edx
+	movdqa	48(%rsi), %xmm0
+	palignr	$14, 32(%rsi), %xmm0
+	pcmpeqb	32(%rdi), %xmm0
+	lea	32(%rsi), %rsi
+	pcmpeqb	48(%rdi), %xmm3
+
+	lea	32(%rdi), %rdi
+	jz	L(shr_14_gobble_loop)
+	pand	%xmm0, %xmm3
+
+	cmp	$0, %rcx
+	jge	L(shr_14_gobble_next)
+	inc	%edx
+	add	$32, %rcx
+L(shr_14_gobble_next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+
+	lea	14(%rsi), %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_15):
+	cmp	$80, %rcx
+	lea	-48(%rcx), %rcx
+	mov	%edx, %eax
+	jae	L(shr_15_gobble)
+
+	movdqa	16(%rsi), %xmm1
+	movdqa	%xmm1, %xmm2
+	palignr	$15, (%rsi), %xmm1
+	pcmpeqb	(%rdi), %xmm1
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$15, %xmm2, %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+	pand	%xmm1, %xmm3
+	pmovmskb %xmm3, %edx
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+	add	$15, %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+
+	ALIGN	(4)
+L(shr_15_gobble):
+	sub	$32, %rcx
+	movdqa	16(%rsi), %xmm0
+	palignr	$15, (%rsi), %xmm0
+	pcmpeqb	(%rdi), %xmm0
+
+	movdqa	32(%rsi), %xmm3
+	palignr	$15, 16(%rsi), %xmm3
+	pcmpeqb	16(%rdi), %xmm3
+
+L(shr_15_gobble_loop):
+	pand	%xmm0, %xmm3
+	sub	$32, %rcx
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+
+	movdqa	64(%rsi), %xmm3
+	palignr	$15, 48(%rsi), %xmm3
+	sbb	$0xffff, %edx
+	movdqa	48(%rsi), %xmm0
+	palignr	$15, 32(%rsi), %xmm0
+	pcmpeqb	32(%rdi), %xmm0
+	lea	32(%rsi), %rsi
+	pcmpeqb	48(%rdi), %xmm3
+
+	lea	32(%rdi), %rdi
+	jz	L(shr_15_gobble_loop)
+	pand	%xmm0, %xmm3
+
+	cmp	$0, %rcx
+	jge	L(shr_15_gobble_next)
+	inc	%edx
+	add	$32, %rcx
+L(shr_15_gobble_next):
+	test	%edx, %edx
+	jnz	L(exit)
+
+	pmovmskb %xmm3, %edx
+	movdqa	%xmm0, %xmm1
+	lea	32(%rdi), %rdi
+	lea	32(%rsi), %rsi
+	sub	$0xffff, %edx
+	jnz	L(exit)
+
+	lea	15(%rsi), %rsi
+	add	%rcx, %rsi
+	add	%rcx, %rdi
+	jmp	L(less48bytes)
+# endif
+	ALIGN	(4)
+L(exit):
+	pmovmskb %xmm1, %r8d
+	sub	$0xffff, %r8d
+	jz	L(first16bytes)
+	lea	-16(%rsi), %rsi
+	lea	-16(%rdi), %rdi
+	mov	%r8d, %edx
+L(first16bytes):
+	add	%rax, %rsi
+L(less16bytes):
+# ifndef USE_AS_WMEMCMP
+	test	%dl, %dl
+	jz	L(next_24_bytes)
+
+	test	$0x01, %dl
+	jnz	L(Byte16)
+
+	test	$0x02, %dl
+	jnz	L(Byte17)
+
+	test	$0x04, %dl
+	jnz	L(Byte18)
+
+	test	$0x08, %dl
+	jnz	L(Byte19)
+
+	test	$0x10, %dl
+	jnz	L(Byte20)
+
+	test	$0x20, %dl
+	jnz	L(Byte21)
+
+	test	$0x40, %dl
+	jnz	L(Byte22)
+
+	movzbl	-9(%rdi), %eax
+	movzbl	-9(%rsi), %edx
+	sub	%edx, %eax
+	ret
+
+	ALIGN	(4)
+L(Byte16):
+	movzbl	-16(%rdi), %eax
+	movzbl	-16(%rsi), %edx
+	sub	%edx, %eax
+	ret
+
+	ALIGN	(4)
+L(Byte17):
+	movzbl	-15(%rdi), %eax
+	movzbl	-15(%rsi), %edx
+	sub	%edx, %eax
+	ret
+
+	ALIGN	(4)
+L(Byte18):
+	movzbl	-14(%rdi), %eax
+	movzbl	-14(%rsi), %edx
+	sub	%edx, %eax
+	ret
+
+	ALIGN	(4)
+L(Byte19):
+	movzbl	-13(%rdi), %eax
+	movzbl	-13(%rsi), %edx
+	sub	%edx, %eax
+	ret
+
+	ALIGN	(4)
+L(Byte20):
+	movzbl	-12(%rdi), %eax
+	movzbl	-12(%rsi), %edx
+	sub	%edx, %eax
+	ret
+
+	ALIGN	(4)
+L(Byte21):
+	movzbl	-11(%rdi), %eax
+	movzbl	-11(%rsi), %edx
+	sub	%edx, %eax
+	ret
+
+	ALIGN	(4)
+L(Byte22):
+	movzbl	-10(%rdi), %eax
+	movzbl	-10(%rsi), %edx
+	sub	%edx, %eax
+	ret
+
+	ALIGN	(4)
+L(next_24_bytes):
+	lea	8(%rdi), %rdi
+	lea	8(%rsi), %rsi
+	test	$0x01, %dh
+	jnz	L(Byte16)
+
+	test	$0x02, %dh
+	jnz	L(Byte17)
+
+	test	$0x04, %dh
+	jnz	L(Byte18)
+
+	test	$0x08, %dh
+	jnz	L(Byte19)
+
+	test	$0x10, %dh
+	jnz	L(Byte20)
+
+	test	$0x20, %dh
+	jnz	L(Byte21)
+
+	test	$0x40, %dh
+	jnz	L(Byte22)
+
+	mov	-9(%rdi), %eax
+	and	$0xff, %eax
+	mov	-9(%rsi), %edx
+	and	$0xff, %edx
+	sub	%edx, %eax
+	ret
+# else
+/* special for wmemcmp */
+	xor	%eax, %eax
+	test	%dl, %dl
+	jz	L(next_two_double_words)
+	and	$15, %dl
+	jz	L(second_double_word)
+	mov	-16(%rdi), %eax
+	cmp	-16(%rsi), %eax
+	jne	L(find_diff)
+	ret
+
+	ALIGN	(4)
+L(second_double_word):
+	mov	-12(%rdi), %eax
+	cmp	-12(%rsi), %eax
+	jne	L(find_diff)
+	ret
+
+	ALIGN	(4)
+L(next_two_double_words):
+	and	$15, %dh
+	jz	L(fourth_double_word)
+	mov	-8(%rdi), %eax
+	cmp	-8(%rsi), %eax
+	jne	L(find_diff)
+	ret
+
+	ALIGN	(4)
+L(fourth_double_word):
+	mov	-4(%rdi), %eax
+	cmp	-4(%rsi), %eax
+	jne	L(find_diff)
+	ret
+# endif
+
+	ALIGN	(4)
+L(less48bytes):
+	cmp	$8, %ecx
+	jae	L(more8bytes)
+	cmp	$0, %ecx
+	je	L(0bytes)
+# ifndef USE_AS_WMEMCMP
+	cmp	$1, %ecx
+	je	L(1bytes)
+	cmp	$2, %ecx
+	je	L(2bytes)
+	cmp	$3, %ecx
+	je	L(3bytes)
+	cmp	$4, %ecx
+	je	L(4bytes)
+	cmp	$5, %ecx
+	je	L(5bytes)
+	cmp	$6, %ecx
+	je	L(6bytes)
+	jmp	L(7bytes)
+# else
+	jmp	L(4bytes)
+# endif
+
+	ALIGN	(4)
+L(more8bytes):
+	cmp	$16, %ecx
+	jae	L(more16bytes)
+	cmp	$8, %ecx
+	je	L(8bytes)
+# ifndef USE_AS_WMEMCMP
+	cmp	$9, %ecx
+	je	L(9bytes)
+	cmp	$10, %ecx
+	je	L(10bytes)
+	cmp	$11, %ecx
+	je	L(11bytes)
+	cmp	$12, %ecx
+	je	L(12bytes)
+	cmp	$13, %ecx
+	je	L(13bytes)
+	cmp	$14, %ecx
+	je	L(14bytes)
+	jmp	L(15bytes)
+# else
+	jmp	L(12bytes)
+# endif
+
+	ALIGN	(4)
+L(more16bytes):
+	cmp	$24, %ecx
+	jae	L(more24bytes)
+	cmp	$16, %ecx
+	je	L(16bytes)
+# ifndef USE_AS_WMEMCMP
+	cmp	$17, %ecx
+	je	L(17bytes)
+	cmp	$18, %ecx
+	je	L(18bytes)
+	cmp	$19, %ecx
+	je	L(19bytes)
+	cmp	$20, %ecx
+	je	L(20bytes)
+	cmp	$21, %ecx
+	je	L(21bytes)
+	cmp	$22, %ecx
+	je	L(22bytes)
+	jmp	L(23bytes)
+# else
+	jmp	L(20bytes)
+# endif
+
+	ALIGN	(4)
+L(more24bytes):
+	cmp	$32, %ecx
+	jae	L(more32bytes)
+	cmp	$24, %ecx
+	je	L(24bytes)
+# ifndef USE_AS_WMEMCMP
+	cmp	$25, %ecx
+	je	L(25bytes)
+	cmp	$26, %ecx
+	je	L(26bytes)
+	cmp	$27, %ecx
+	je	L(27bytes)
+	cmp	$28, %ecx
+	je	L(28bytes)
+	cmp	$29, %ecx
+	je	L(29bytes)
+	cmp	$30, %ecx
+	je	L(30bytes)
+	jmp	L(31bytes)
+# else
+	jmp	L(28bytes)
+# endif
+
+	ALIGN	(4)
+L(more32bytes):
+	cmp	$40, %ecx
+	jae	L(more40bytes)
+	cmp	$32, %ecx
+	je	L(32bytes)
+# ifndef USE_AS_WMEMCMP
+	cmp	$33, %ecx
+	je	L(33bytes)
+	cmp	$34, %ecx
+	je	L(34bytes)
+	cmp	$35, %ecx
+	je	L(35bytes)
+	cmp	$36, %ecx
+	je	L(36bytes)
+	cmp	$37, %ecx
+	je	L(37bytes)
+	cmp	$38, %ecx
+	je	L(38bytes)
+	jmp	L(39bytes)
+# else
+	jmp	L(36bytes)
+# endif
+ 
+	ALIGN	(4)
+L(more40bytes):
+	cmp	$40, %ecx
+	je	L(40bytes)
+# ifndef USE_AS_WMEMCMP
+	cmp	$41, %ecx
+	je	L(41bytes)
+	cmp	$42, %ecx
+	je	L(42bytes)
+	cmp	$43, %ecx
+	je	L(43bytes)
+	cmp	$44, %ecx
+	je	L(44bytes)
+	cmp	$45, %ecx
+	je	L(45bytes)
+	cmp	$46, %ecx
+	je	L(46bytes)
+	jmp	L(47bytes)
+
+	ALIGN	(4)
+L(44bytes):
+	movl	-44(%rdi), %eax
+	movl	-44(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(40bytes):
+	movl	-40(%rdi), %eax
+	movl	-40(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(36bytes):
+	movl	-36(%rdi), %eax
+	movl	-36(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(32bytes):
+	movl	-32(%rdi), %eax
+	movl	-32(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(28bytes):
+	movl	-28(%rdi), %eax
+	movl	-28(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(24bytes):
+	movl	-24(%rdi), %eax
+	movl	-24(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(20bytes):
+	movl	-20(%rdi), %eax
+	movl	-20(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(16bytes):
+	movl	-16(%rdi), %eax
+	movl	-16(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(12bytes):
+	movl	-12(%rdi), %eax
+	movl	-12(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(8bytes):
+	movl	-8(%rdi), %eax
+	movl	-8(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(4bytes):
+	movl	-4(%rdi), %eax
+	movl	-4(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(0bytes):
+	xor	%eax, %eax
+	ret
+# else
+	ALIGN	(4)
+L(44bytes):
+	movl	-44(%rdi), %eax
+	cmp	-44(%rsi), %eax
+	jne	L(find_diff)
+L(40bytes):
+	movl	-40(%rdi), %eax
+	cmp	-40(%rsi), %eax
+	jne	L(find_diff)
+L(36bytes):
+	movl	-36(%rdi), %eax
+	cmp	-36(%rsi), %eax
+	jne	L(find_diff)
+L(32bytes):
+	movl	-32(%rdi), %eax
+	cmp	-32(%rsi), %eax
+	jne	L(find_diff)
+L(28bytes):
+	movl	-28(%rdi), %eax
+	cmp	-28(%rsi), %eax
+	jne	L(find_diff)
+L(24bytes):
+	movl	-24(%rdi), %eax
+	cmp	-24(%rsi), %eax
+	jne	L(find_diff)
+L(20bytes):
+	movl	-20(%rdi), %eax
+	cmp	-20(%rsi), %eax
+	jne	L(find_diff)
+L(16bytes):
+	movl	-16(%rdi), %eax
+	cmp	-16(%rsi), %eax
+	jne	L(find_diff)
+L(12bytes):
+	movl	-12(%rdi), %eax
+	cmp	-12(%rsi), %eax
+	jne	L(find_diff)
+L(8bytes):
+	movl	-8(%rdi), %eax
+	cmp	-8(%rsi), %eax
+	jne	L(find_diff)
+L(4bytes):
+	movl	-4(%rdi), %eax
+	cmp	-4(%rsi), %eax
+	jne	L(find_diff)
+L(0bytes):
+	xor	%eax, %eax
+	ret
+# endif
+
+# ifndef USE_AS_WMEMCMP
+	ALIGN	(4)
+L(45bytes):
+	movl	-45(%rdi), %eax
+	movl	-45(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(41bytes):
+	movl	-41(%rdi), %eax
+	movl	-41(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(37bytes):
+	movl	-37(%rdi), %eax
+	movl	-37(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(33bytes):
+	movl	-33(%rdi), %eax
+	movl	-33(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(29bytes):
+	movl	-29(%rdi), %eax
+	movl	-29(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(25bytes):
+	movl	-25(%rdi), %eax
+	movl	-25(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(21bytes):
+	movl	-21(%rdi), %eax
+	movl	-21(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(17bytes):
+	movl	-17(%rdi), %eax
+	movl	-17(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(13bytes):
+	movl	-13(%rdi), %eax
+	movl	-13(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(9bytes):
+	movl	-9(%rdi), %eax
+	movl	-9(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(5bytes):
+	movl	-5(%rdi), %eax
+	movl	-5(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(1bytes):
+	movzbl	-1(%rdi), %eax
+	cmpb	-1(%rsi), %al
+	jne	L(set)
+	xor	%eax, %eax
+	ret
+
+	ALIGN	(4)
+L(46bytes):
+	movl	-46(%rdi), %eax
+	movl	-46(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(42bytes):
+	movl	-42(%rdi), %eax
+	movl	-42(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(38bytes):
+	movl	-38(%rdi), %eax
+	movl	-38(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(34bytes):
+	movl	-34(%rdi), %eax
+	movl	-34(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(30bytes):
+	movl	-30(%rdi), %eax
+	movl	-30(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(26bytes):
+	movl	-26(%rdi), %eax
+	movl	-26(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(22bytes):
+	movl	-22(%rdi), %eax
+	movl	-22(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(18bytes):
+	movl	-18(%rdi), %eax
+	movl	-18(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(14bytes):
+	movl	-14(%rdi), %eax
+	movl	-14(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(10bytes):
+	movl	-10(%rdi), %eax
+	movl	-10(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(6bytes):
+	movl	-6(%rdi), %eax
+	movl	-6(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(2bytes):
+	movzwl	-2(%rdi), %eax
+	movzwl	-2(%rsi), %ecx
+	cmpb	%cl, %al
+	jne	L(set)
+	cmp	%ecx, %eax
+	jne	L(set)
+	xor	%eax, %eax
+	ret
+
+	ALIGN	(4)
+L(47bytes):
+	movl	-47(%rdi), %eax
+	movl	-47(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(43bytes):
+	movl	-43(%rdi), %eax
+	movl	-43(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(39bytes):
+	movl	-39(%rdi), %eax
+	movl	-39(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(35bytes):
+	movl	-35(%rdi), %eax
+	movl	-35(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(31bytes):
+	movl	-31(%rdi), %eax
+	movl	-31(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(27bytes):
+	movl	-27(%rdi), %eax
+	movl	-27(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(23bytes):
+	movl	-23(%rdi), %eax
+	movl	-23(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(19bytes):
+	movl	-19(%rdi), %eax
+	movl	-19(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(15bytes):
+	movl	-15(%rdi), %eax
+	movl	-15(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(11bytes):
+	movl	-11(%rdi), %eax
+	movl	-11(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(7bytes):
+	movl	-7(%rdi), %eax
+	movl	-7(%rsi), %ecx
+	cmp	%ecx, %eax
+	jne	L(find_diff)
+L(3bytes):
+	movzwl	-3(%rdi), %eax
+	movzwl	-3(%rsi), %ecx
+	cmpb	%cl, %al
+	jne	L(set)
+	cmp	%ecx, %eax
+	jne	L(set)
+	movzbl	-1(%rdi), %eax
+	cmpb	-1(%rsi), %al
+	jne	L(set)
+	xor	%eax, %eax
+	ret
+
+	ALIGN	(4)
+L(find_diff):
+	cmpb	%cl, %al
+	jne	L(set)
+	cmpw	%cx, %ax
+	jne	L(set)
+	shr	$16, %eax
+	shr	$16, %ecx
+	cmpb	%cl, %al
+	jne	L(set)
+
+/* We get there only if we already know there is a
+difference.  */
+
+	cmp	%ecx, %eax
+L(set):
+	sbb	%eax, %eax
+	sbb	$-1, %eax
+	ret
+# else
+
+/* for wmemcmp */
+	ALIGN	(4)
+L(find_diff):
+	mov	$1, %eax
+	jg	L(find_diff_bigger)
+	neg	%eax
+	ret
+
+	ALIGN	(4)
+L(find_diff_bigger):
+	ret
+# endif
+
+	ALIGN	(4)
+L(equal):
+	xor	%eax, %eax
+	ret
+
+END (MEMCMP)
+#endif