Add optimized str{,n}casecmp for AVX on x86-64

1 files changed, 1836 insertions, 0 deletions

diff --git a/sysdeps/x86_64/multiarch/strcmp-sse42.S b/sysdeps/x86_64/multiarch/strcmp-sse42.S
new file mode 100644
index 0000000000..c9e03b9ca0
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/strcmp-sse42.S
@@ -0,0 +1,1836 @@
+/* strcmp with SSE4.2
+   Copyright (C) 2009, 2010, 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.  */
+
+
+/* We use 0x1a:
+	_SIDD_SBYTE_OPS
+	| _SIDD_CMP_EQUAL_EACH
+	| _SIDD_NEGATIVE_POLARITY
+	| _SIDD_LEAST_SIGNIFICANT
+   on pcmpistri to find out if two 16byte data elements are the same
+   and the offset of the first different byte.  There are 4 cases:
+
+   1. Both 16byte data elements are valid and identical.
+   2. Both 16byte data elements have EOS and identical.
+   3. Both 16byte data elements are valid and they differ at offset X.
+   4. At least one 16byte data element has EOS at offset X.  Two 16byte
+      data elements must differ at or before offset X.
+
+   Here is the table of ECX, CFlag, ZFlag and SFlag for 4 cases:
+
+   case		ECX	CFlag	ZFlag	SFlag
+    1		16	  0	  0	  0
+    2		16	  0	  1	  1
+    3		 X	  1	  0	  0
+    4	       0 <= X	  1	 0/1	 0/1
+
+   We exit from the loop for cases 2, 3 and 4 with jbe which branches
+   when either CFlag or ZFlag is 1.  If CFlag == 0, we return 0 for
+   case 2.  */
+
+	/* Put all SSE 4.2 functions together.  */
+	.section .text.SECTION,"ax",@progbits
+	.align	16
+	.type	STRCMP_SSE42, @function
+#ifdef USE_AS_STRCASECMP_L
+ENTRY (GLABEL(__strcasecmp))
+	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 (GLABEL(__strcasecmp))
+	/* FALLTHROUGH to strcasecmp_l.  */
+#endif
+#ifdef USE_AS_STRNCASECMP_L
+ENTRY (GLABEL(__strncasecmp))
+	movq	__libc_tsd_LOCALE@gottpoff(%rip),%rax
+	movq	%fs:(%rax),%rcx
+
+	// XXX 5 byte should be before the function
+	/* 5-byte NOP.  */
+	.byte	0x0f,0x1f,0x44,0x00,0x00
+END (GLABEL(__strncasecmp))
+	/* FALLTHROUGH to strncasecmp_l.  */
+#endif
+
+STRCMP_SSE42:
+	cfi_startproc
+	CALL_MCOUNT
+
+/*
+ * This implementation uses SSE to compare up to 16 bytes at a time.
+ */
+#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
+	movq	LOCALE_T___LOCALES+LC_CTYPE*8(%rdx), %rax
+# else
+	movq	(%rdx), %rax
+# endif
+	testl	$0, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES(%rax)
+	jne	__strcasecmp_l_nonascii
+#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(%rcx), %rax
+# else
+	movq	(%rcx), %rax
+# endif
+	testl	$0, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES(%rax)
+	jne	__strncasecmp_l_nonascii
+#endif
+
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	test	%rdx, %rdx
+	je	LABEL(strcmp_exitz)
+	cmp	$1, %rdx
+	je	LABEL(Byte0)
+	mov	%rdx, %r11
+#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 */
+#if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
+	.section .rodata.cst16,"aM",@progbits,16
+	.align 16
+LABEL(belowupper):
+	.quad	0x4040404040404040
+	.quad	0x4040404040404040
+LABEL(topupper):
+# ifdef USE_AVX
+	.quad	0x5a5a5a5a5a5a5a5a
+	.quad	0x5a5a5a5a5a5a5a5a
+# else
+	.quad	0x5b5b5b5b5b5b5b5b
+	.quad	0x5b5b5b5b5b5b5b5b
+# endif
+LABEL(touppermask):
+	.quad	0x2020202020202020
+	.quad	0x2020202020202020
+	.previous
+	movdqa	LABEL(belowupper)(%rip), %xmm4
+# define UCLOW_reg %xmm4
+	movdqa	LABEL(topupper)(%rip), %xmm5
+# define UCHIGH_reg %xmm5
+	movdqa	LABEL(touppermask)(%rip), %xmm6
+# define LCQWORD_reg %xmm6
+#endif
+	cmp	$0x30, %ecx
+	ja	LABEL(crosscache)/* rsi: 16-byte load will cross cache line */
+	cmp	$0x30, %eax
+	ja	LABEL(crosscache)/* rdi: 16-byte load will cross cache line */
+	movdqu	(%rdi), %xmm1
+	movdqu	(%rsi), %xmm2
+#if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
+# ifdef USE_AVX
+#  define TOLOWER(reg1, reg2) \
+	vpcmpgtb UCLOW_reg, reg1, %xmm7;			\
+	vpcmpgtb UCHIGH_reg, reg1, %xmm8;			\
+	vpcmpgtb UCLOW_reg, reg2, %xmm9;			\
+	vpcmpgtb UCHIGH_reg, reg2, %xmm10;			\
+	vpandn	%xmm7, %xmm8, %xmm8;					\
+	vpandn	%xmm9, %xmm10, %xmm10;					\
+	vpand	LCQWORD_reg, %xmm8, %xmm8;				\
+	vpand	LCQWORD_reg, %xmm10, %xmm10;				\
+	vpor	reg1, %xmm8, reg1;					\
+	vpor	reg2, %xmm10, reg2
+# else
+#  define TOLOWER(reg1, reg2) \
+	movdqa	reg1, %xmm7;					\
+	movdqa	UCHIGH_reg, %xmm8;				\
+	movdqa	reg2, %xmm9;					\
+	movdqa	UCHIGH_reg, %xmm10;				\
+	pcmpgtb	UCLOW_reg, %xmm7;				\
+	pcmpgtb	reg1, %xmm8;					\
+	pcmpgtb	UCLOW_reg, %xmm9;				\
+	pcmpgtb	reg2, %xmm10;					\
+	pand	%xmm8, %xmm7;					\
+	pand	%xmm10, %xmm9;					\
+	pand	LCQWORD_reg, %xmm7;				\
+	pand	LCQWORD_reg, %xmm9;				\
+	por	%xmm7, reg1;					\
+	por	%xmm9, reg2
+# endif
+	TOLOWER (%xmm1, %xmm2)
+#else
+# define TOLOWER(reg1, reg2)
+#endif
+	pxor	%xmm0, %xmm0		/* clear %xmm0 for null char checks */
+	pcmpeqb	%xmm1, %xmm0		/* Any null chars? */
+	pcmpeqb	%xmm2, %xmm1		/* compare first 16 bytes for equality */
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	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 */
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)/* finish comparision */
+#endif
+	add	$16, %rsi		/* prepare to search next 16 bytes */
+	add	$16, %rdi		/* prepare to search next 16 bytes */
+
+	/*
+	 * Determine source and destination string offsets from 16-byte
+	 * alignment.  Use relative offset difference between the two to
+	 * determine which case below to use.
+	 */
+	.p2align 4
+LABEL(crosscache):
+	and	$0xfffffffffffffff0, %rsi /* force %rsi is 16 byte aligned */
+	and	$0xfffffffffffffff0, %rdi /* force %rdi is 16 byte aligned */
+	mov	$0xffff, %edx		/* for equivalent offset */
+	xor	%r8d, %r8d
+	and	$0xf, %ecx		/* offset of rsi */
+	and	$0xf, %eax		/* offset of rdi */
+	cmp	%eax, %ecx
+	je	LABEL(ashr_0)		/* rsi and rdi relative offset same */
+	ja	LABEL(bigger)
+	mov	%edx, %r8d		/* r8d is offset flag for exit tail */
+	xchg	%ecx, %eax
+	xchg	%rsi, %rdi
+LABEL(bigger):
+	lea	15(%rax), %r9
+	sub	%rcx, %r9
+	lea	LABEL(unaligned_table)(%rip), %r10
+	movslq	(%r10, %r9,4), %r9
+	lea	(%r10, %r9), %r10
+	jmp	*%r10			/* jump to corresponding case */
+
+/*
+ * The following cases will be handled by ashr_0
+ *  rcx(offset of rsi)  rax(offset of rdi)  relative offset  corresponding case
+ *        n(0~15)            n(0~15)           15(15+ n-n)         ashr_0
+ */
+	.p2align 4
+LABEL(ashr_0):
+
+	movdqa	(%rsi), %xmm1
+	pxor	%xmm0, %xmm0		/* clear %xmm0 for null char check */
+	pcmpeqb	%xmm1, %xmm0		/* Any null chars? */
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpeqb	(%rdi), %xmm1		/* compare 16 bytes for equality */
+#else
+	movdqa	(%rdi), %xmm2
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm2, %xmm1		/* compare 16 bytes for equality */
+#endif
+	psubb	%xmm0, %xmm1		/* packed sub of comparison results*/
+	pmovmskb %xmm1, %r9d
+	shr	%cl, %edx		/* adjust 0xffff for offset */
+	shr	%cl, %r9d		/* adjust for 16-byte offset */
+	sub	%r9d, %edx
+	/*
+	 * edx must be the same with r9d if in left byte (16-rcx) is equal to
+	 * the start from (16-rax) and no null char was seen.
+	 */
+	jne	LABEL(less32bytes)	/* mismatch or null char */
+	UPDATE_STRNCMP_COUNTER
+	mov	$16, %rcx
+	mov	$16, %r9
+	pxor	%xmm0, %xmm0		/* clear xmm0, may have changed above */
+
+	/*
+	 * Now both strings are aligned at 16-byte boundary. Loop over strings
+	 * checking 32-bytes per iteration.
+	 */
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+	.p2align 4
+LABEL(ashr_0_use):
+	movdqa	(%rdi,%rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri      $0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	lea	16(%rdx), %rdx
+	jbe	LABEL(ashr_0_exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	movdqa	(%rdi,%rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri      $0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	lea	16(%rdx), %rdx
+	jbe	LABEL(ashr_0_exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	jmp	LABEL(ashr_0_use)
+
+
+	.p2align 4
+LABEL(ashr_0_exit_use):
+	jnc	LABEL(strcmp_exitz)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	%rcx, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	lea	-16(%rdx, %rcx), %rcx
+	movzbl	(%rdi, %rcx), %eax
+	movzbl	(%rsi, %rcx), %edx
+#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
+#endif
+	sub	%edx, %eax
+	ret
+
+
+
+/*
+ * The following cases will be handled by ashr_1
+ * rcx(offset of rsi)  rax(offset of rdi)   relative offset	corresponding case
+ *        n(15)            n -15            0(15 +(n-15) - n)         ashr_1
+ */
+	.p2align 4
+LABEL(ashr_1):
+	pxor	%xmm0, %xmm0
+	movdqa	(%rdi), %xmm2
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	%xmm1, %xmm0		/* Any null chars? */
+	pslldq	$15, %xmm2		/* shift first string to align with second */
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm1, %xmm2		/* compare 16 bytes for equality */
+	psubb	%xmm0, %xmm2		/* packed sub of comparison results*/
+	pmovmskb %xmm2, %r9d
+	shr	%cl, %edx		/* adjust 0xffff for offset */
+	shr	%cl, %r9d		/* adjust for 16-byte offset */
+	sub	%r9d, %edx
+	jnz	LABEL(less32bytes)	/* mismatch or null char seen */
+	movdqa	(%rdi), %xmm3
+	UPDATE_STRNCMP_COUNTER
+
+	pxor	%xmm0, %xmm0
+	mov	$16, %rcx		/* index for loads*/
+	mov	$1, %r9d		/* byte position left over from less32bytes case */
+	/*
+	 * Setup %r10 value allows us to detect crossing a page boundary.
+	 * When %r10 goes positive we have crossed a page boundary and
+	 * need to do a nibble.
+	 */
+	lea	1(%rdi), %r10
+	and	$0xfff, %r10		/* offset into 4K page */
+	sub	$0x1000, %r10		/* subtract 4K pagesize */
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+
+	.p2align 4
+LABEL(loop_ashr_1_use):
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_1_use)
+
+LABEL(nibble_ashr_1_restart_use):
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $1, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	add	$16, %rdx
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_1_use)
+
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $1, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	$16, %rdx
+	jmp	LABEL(loop_ashr_1_use)
+
+	.p2align 4
+LABEL(nibble_ashr_1_use):
+	sub	$0x1000, %r10
+	movdqa	-16(%rdi, %rdx), %xmm0
+	psrldq	$1, %xmm0
+	pcmpistri      $0x3a,%xmm0, %xmm0
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	cmp	%r11, %rcx
+	jae	LABEL(nibble_ashr_exit_use)
+#endif
+	cmp	$14, %ecx
+	ja	LABEL(nibble_ashr_1_restart_use)
+
+	jmp	LABEL(nibble_ashr_exit_use)
+
+/*
+ * The following cases will be handled by ashr_2
+ * rcx(offset of rsi)  rax(offset of rdi)   relative offset	corresponding case
+ *        n(14~15)            n -14         1(15 +(n-14) - n)         ashr_2
+ */
+	.p2align 4
+LABEL(ashr_2):
+	pxor	%xmm0, %xmm0
+	movdqa	(%rdi), %xmm2
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	%xmm1, %xmm0
+	pslldq	$14, %xmm2
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm1, %xmm2
+	psubb	%xmm0, %xmm2
+	pmovmskb %xmm2, %r9d
+	shr	%cl, %edx
+	shr	%cl, %r9d
+	sub	%r9d, %edx
+	jnz	LABEL(less32bytes)
+	movdqa	(%rdi), %xmm3
+	UPDATE_STRNCMP_COUNTER
+
+	pxor	%xmm0, %xmm0
+	mov	$16, %rcx	/* index for loads */
+	mov	$2, %r9d	/* byte position left over from less32bytes case */
+	/*
+	 * Setup %r10 value allows us to detect crossing a page boundary.
+	 * When %r10 goes positive we have crossed a page boundary and
+	 * need to do a nibble.
+	 */
+	lea	2(%rdi), %r10
+	and	$0xfff, %r10	/* offset into 4K page */
+	sub	$0x1000, %r10	/* subtract 4K pagesize */
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+
+	.p2align 4
+LABEL(loop_ashr_2_use):
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_2_use)
+
+LABEL(nibble_ashr_2_restart_use):
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $2, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	add	$16, %rdx
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_2_use)
+
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $2, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	$16, %rdx
+	jmp	LABEL(loop_ashr_2_use)
+
+	.p2align 4
+LABEL(nibble_ashr_2_use):
+	sub	$0x1000, %r10
+	movdqa	-16(%rdi, %rdx), %xmm0
+	psrldq	$2, %xmm0
+	pcmpistri      $0x3a,%xmm0, %xmm0
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	cmp	%r11, %rcx
+	jae	LABEL(nibble_ashr_exit_use)
+#endif
+	cmp	$13, %ecx
+	ja	LABEL(nibble_ashr_2_restart_use)
+
+	jmp	LABEL(nibble_ashr_exit_use)
+
+/*
+ * The following cases will be handled by ashr_3
+ *  rcx(offset of rsi)  rax(offset of rdi)  relative offset	 corresponding case
+ *        n(13~15)            n -13         2(15 +(n-13) - n)         ashr_3
+ */
+	.p2align 4
+LABEL(ashr_3):
+	pxor	%xmm0, %xmm0
+	movdqa	(%rdi), %xmm2
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	%xmm1, %xmm0
+	pslldq	$13, %xmm2
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm1, %xmm2
+	psubb	%xmm0, %xmm2
+	pmovmskb %xmm2, %r9d
+	shr	%cl, %edx
+	shr	%cl, %r9d
+	sub	%r9d, %edx
+	jnz	LABEL(less32bytes)
+	movdqa	(%rdi), %xmm3
+
+	UPDATE_STRNCMP_COUNTER
+
+	pxor	%xmm0, %xmm0
+	mov	$16, %rcx	/* index for loads */
+	mov	$3, %r9d	/* byte position left over from less32bytes case */
+	/*
+	 * Setup %r10 value allows us to detect crossing a page boundary.
+	 * When %r10 goes positive we have crossed a page boundary and
+	 * need to do a nibble.
+	 */
+	lea	3(%rdi), %r10
+	and	$0xfff, %r10	/* offset into 4K page */
+	sub	$0x1000, %r10	/* subtract 4K pagesize */
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+
+LABEL(loop_ashr_3_use):
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_3_use)
+
+LABEL(nibble_ashr_3_restart_use):
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $3, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	add	$16, %rdx
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_3_use)
+
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $3, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	$16, %rdx
+	jmp	LABEL(loop_ashr_3_use)
+
+	.p2align 4
+LABEL(nibble_ashr_3_use):
+	sub	$0x1000, %r10
+	movdqa	-16(%rdi, %rdx), %xmm0
+	psrldq	$3, %xmm0
+	pcmpistri      $0x3a,%xmm0, %xmm0
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	cmp	%r11, %rcx
+	jae	LABEL(nibble_ashr_exit_use)
+#endif
+	cmp	$12, %ecx
+	ja	LABEL(nibble_ashr_3_restart_use)
+
+	jmp	LABEL(nibble_ashr_exit_use)
+
+/*
+ * The following cases will be handled by ashr_4
+ *  rcx(offset of rsi)  rax(offset of rdi)  relative offset	 corresponding case
+ *        n(12~15)            n -12         3(15 +(n-12) - n)         ashr_4
+ */
+	.p2align 4
+LABEL(ashr_4):
+	pxor	%xmm0, %xmm0
+	movdqa	(%rdi), %xmm2
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	%xmm1, %xmm0
+	pslldq	$12, %xmm2
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm1, %xmm2
+	psubb	%xmm0, %xmm2
+	pmovmskb %xmm2, %r9d
+	shr	%cl, %edx
+	shr	%cl, %r9d
+	sub	%r9d, %edx
+	jnz	LABEL(less32bytes)
+	movdqa	(%rdi), %xmm3
+
+	UPDATE_STRNCMP_COUNTER
+
+	pxor	%xmm0, %xmm0
+	mov	$16, %rcx	/* index for loads */
+	mov	$4, %r9d	/* byte position left over from less32bytes case */
+	/*
+	 * Setup %r10 value allows us to detect crossing a page boundary.
+	 * When %r10 goes positive we have crossed a page boundary and
+	 * need to do a nibble.
+	 */
+	lea	4(%rdi), %r10
+	and	$0xfff, %r10	/* offset into 4K page */
+	sub	$0x1000, %r10	/* subtract 4K pagesize */
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+
+	.p2align 4
+LABEL(loop_ashr_4_use):
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_4_use)
+
+LABEL(nibble_ashr_4_restart_use):
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $4, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	add	$16, %rdx
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_4_use)
+
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $4, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	$16, %rdx
+	jmp	LABEL(loop_ashr_4_use)
+
+	.p2align 4
+LABEL(nibble_ashr_4_use):
+	sub	$0x1000, %r10
+	movdqa	-16(%rdi, %rdx), %xmm0
+	psrldq	$4, %xmm0
+	pcmpistri      $0x3a,%xmm0, %xmm0
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	cmp	%r11, %rcx
+	jae	LABEL(nibble_ashr_exit_use)
+#endif
+	cmp	$11, %ecx
+	ja	LABEL(nibble_ashr_4_restart_use)
+
+	jmp	LABEL(nibble_ashr_exit_use)
+
+/*
+ * The following cases will be handled by ashr_5
+ *  rcx(offset of rsi)  rax(offset of rdi)        relative offset      corresponding case
+ *        n(11~15)          n - 11		  4(15 +(n-11) - n)         ashr_5
+ */
+	.p2align 4
+LABEL(ashr_5):
+	pxor	%xmm0, %xmm0
+	movdqa	(%rdi), %xmm2
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	%xmm1, %xmm0
+	pslldq	$11, %xmm2
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm1, %xmm2
+	psubb	%xmm0, %xmm2
+	pmovmskb %xmm2, %r9d
+	shr	%cl, %edx
+	shr	%cl, %r9d
+	sub	%r9d, %edx
+	jnz	LABEL(less32bytes)
+	movdqa	(%rdi), %xmm3
+
+	UPDATE_STRNCMP_COUNTER
+
+	pxor	%xmm0, %xmm0
+	mov	$16, %rcx	/* index for loads */
+	mov	$5, %r9d	/* byte position left over from less32bytes case */
+	/*
+	 * Setup %r10 value allows us to detect crossing a page boundary.
+	 * When %r10 goes positive we have crossed a page boundary and
+	 * need to do a nibble.
+	 */
+	lea	5(%rdi), %r10
+	and	$0xfff, %r10	/* offset into 4K page */
+	sub	$0x1000, %r10	/* subtract 4K pagesize */
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+
+	.p2align 4
+LABEL(loop_ashr_5_use):
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_5_use)
+
+LABEL(nibble_ashr_5_restart_use):
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $5, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	add	$16, %rdx
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_5_use)
+
+	movdqa	(%rdi, %rdx), %xmm0
+
+	palignr $5, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	$16, %rdx
+	jmp	LABEL(loop_ashr_5_use)
+
+	.p2align 4
+LABEL(nibble_ashr_5_use):
+	sub	$0x1000, %r10
+	movdqa	-16(%rdi, %rdx), %xmm0
+	psrldq	$5, %xmm0
+	pcmpistri      $0x3a,%xmm0, %xmm0
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	cmp	%r11, %rcx
+	jae	LABEL(nibble_ashr_exit_use)
+#endif
+	cmp	$10, %ecx
+	ja	LABEL(nibble_ashr_5_restart_use)
+
+	jmp	LABEL(nibble_ashr_exit_use)
+
+/*
+ * The following cases will be handled by ashr_6
+ *  rcx(offset of rsi)  rax(offset of rdi)        relative offset      corresponding case
+ *        n(10~15)          n - 10		  5(15 +(n-10) - n)         ashr_6
+ */
+	.p2align 4
+LABEL(ashr_6):
+	pxor	%xmm0, %xmm0
+	movdqa	(%rdi), %xmm2
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	%xmm1, %xmm0
+	pslldq	$10, %xmm2
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm1, %xmm2
+	psubb	%xmm0, %xmm2
+	pmovmskb %xmm2, %r9d
+	shr	%cl, %edx
+	shr	%cl, %r9d
+	sub	%r9d, %edx
+	jnz	LABEL(less32bytes)
+	movdqa	(%rdi), %xmm3
+
+	UPDATE_STRNCMP_COUNTER
+
+	pxor	%xmm0, %xmm0
+	mov	$16, %rcx	/* index for loads */
+	mov	$6, %r9d	/* byte position left over from less32bytes case */
+	/*
+	 * Setup %r10 value allows us to detect crossing a page boundary.
+	 * When %r10 goes positive we have crossed a page boundary and
+	 * need to do a nibble.
+	 */
+	lea	6(%rdi), %r10
+	and	$0xfff, %r10	/* offset into 4K page */
+	sub	$0x1000, %r10	/* subtract 4K pagesize */
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+
+	.p2align 4
+LABEL(loop_ashr_6_use):
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_6_use)
+
+LABEL(nibble_ashr_6_restart_use):
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $6, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	add	$16, %rdx
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_6_use)
+
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $6, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	$16, %rdx
+	jmp	LABEL(loop_ashr_6_use)
+
+	.p2align 4
+LABEL(nibble_ashr_6_use):
+	sub	$0x1000, %r10
+	movdqa	-16(%rdi, %rdx), %xmm0
+	psrldq	$6, %xmm0
+	pcmpistri      $0x3a,%xmm0, %xmm0
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	cmp	%r11, %rcx
+	jae	LABEL(nibble_ashr_exit_use)
+#endif
+	cmp	$9, %ecx
+	ja	LABEL(nibble_ashr_6_restart_use)
+
+	jmp	LABEL(nibble_ashr_exit_use)
+
+/*
+ * The following cases will be handled by ashr_7
+ *  rcx(offset of rsi)  rax(offset of rdi)        relative offset      corresponding case
+ *        n(9~15)          n - 9		  6(15 +(n - 9) - n)         ashr_7
+ */
+	.p2align 4
+LABEL(ashr_7):
+	pxor	%xmm0, %xmm0
+	movdqa	(%rdi), %xmm2
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	%xmm1, %xmm0
+	pslldq	$9, %xmm2
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm1, %xmm2
+	psubb	%xmm0, %xmm2
+	pmovmskb %xmm2, %r9d
+	shr	%cl, %edx
+	shr	%cl, %r9d
+	sub	%r9d, %edx
+	jnz	LABEL(less32bytes)
+	movdqa	(%rdi), %xmm3
+
+	UPDATE_STRNCMP_COUNTER
+
+	pxor	%xmm0, %xmm0
+	mov	$16, %rcx	/* index for loads */
+	mov	$7, %r9d	/* byte position left over from less32bytes case */
+	/*
+	 * Setup %r10 value allows us to detect crossing a page boundary.
+	 * When %r10 goes positive we have crossed a page boundary and
+	 * need to do a nibble.
+	 */
+	lea	7(%rdi), %r10
+	and	$0xfff, %r10	/* offset into 4K page */
+	sub	$0x1000, %r10	/* subtract 4K pagesize */
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+
+	.p2align 4
+LABEL(loop_ashr_7_use):
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_7_use)
+
+LABEL(nibble_ashr_7_restart_use):
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $7, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	add	$16, %rdx
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_7_use)
+
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $7, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri	$0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	$16, %rdx
+	jmp	LABEL(loop_ashr_7_use)
+
+	.p2align 4
+LABEL(nibble_ashr_7_use):
+	sub	$0x1000, %r10
+	movdqa	-16(%rdi, %rdx), %xmm0
+	psrldq	$7, %xmm0
+	pcmpistri      $0x3a,%xmm0, %xmm0
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	cmp	%r11, %rcx
+	jae	LABEL(nibble_ashr_exit_use)
+#endif
+	cmp	$8, %ecx
+	ja	LABEL(nibble_ashr_7_restart_use)
+
+	jmp	LABEL(nibble_ashr_exit_use)
+
+/*
+ *  The following cases will be handled by ashr_8
+ *  rcx(offset of rsi)  rax(offset of rdi)        relative offset	 corresponding case
+ *        n(8~15)          n - 8		  7(15 +(n - 8) - n)         ashr_8
+ */
+	.p2align 4
+LABEL(ashr_8):
+	pxor	%xmm0, %xmm0
+	movdqa	(%rdi), %xmm2
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	%xmm1, %xmm0
+	pslldq	$8, %xmm2
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm1, %xmm2
+	psubb	%xmm0, %xmm2
+	pmovmskb %xmm2, %r9d
+	shr	%cl, %edx
+	shr	%cl, %r9d
+	sub	%r9d, %edx
+	jnz	LABEL(less32bytes)
+	movdqa	(%rdi), %xmm3
+
+	UPDATE_STRNCMP_COUNTER
+
+	pxor	%xmm0, %xmm0
+	mov	$16, %rcx	/* index for loads */
+	mov	$8, %r9d	/* byte position left over from less32bytes case */
+	/*
+	 * Setup %r10 value allows us to detect crossing a page boundary.
+	 * When %r10 goes positive we have crossed a page boundary and
+	 * need to do a nibble.
+	 */
+	lea	8(%rdi), %r10
+	and	$0xfff, %r10	/* offset into 4K page */
+	sub	$0x1000, %r10	/* subtract 4K pagesize */
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+
+	.p2align 4
+LABEL(loop_ashr_8_use):
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_8_use)
+
+LABEL(nibble_ashr_8_restart_use):
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $8, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	add	$16, %rdx
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_8_use)
+
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $8, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	$16, %rdx
+	jmp	LABEL(loop_ashr_8_use)
+
+	.p2align 4
+LABEL(nibble_ashr_8_use):
+	sub	$0x1000, %r10
+	movdqa	-16(%rdi, %rdx), %xmm0
+	psrldq	$8, %xmm0
+	pcmpistri      $0x3a,%xmm0, %xmm0
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	cmp	%r11, %rcx
+	jae	LABEL(nibble_ashr_exit_use)
+#endif
+	cmp	$7, %ecx
+	ja	LABEL(nibble_ashr_8_restart_use)
+
+	jmp	LABEL(nibble_ashr_exit_use)
+
+/*
+ *  The following cases will be handled by ashr_9
+ *  rcx(offset of rsi)  rax(offset of rdi)        relative offset	 corresponding case
+ *        n(7~15)          n - 7		  8(15 +(n - 7) - n)         ashr_9
+ */
+	.p2align 4
+LABEL(ashr_9):
+	pxor	%xmm0, %xmm0
+	movdqa	(%rdi), %xmm2
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	%xmm1, %xmm0
+	pslldq	$7, %xmm2
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm1, %xmm2
+	psubb	%xmm0, %xmm2
+	pmovmskb %xmm2, %r9d
+	shr	%cl, %edx
+	shr	%cl, %r9d
+	sub	%r9d, %edx
+	jnz	LABEL(less32bytes)
+	movdqa	(%rdi), %xmm3
+
+	UPDATE_STRNCMP_COUNTER
+
+	pxor	%xmm0, %xmm0
+	mov	$16, %rcx	/* index for loads */
+	mov	$9, %r9d	/* byte position left over from less32bytes case */
+	/*
+	 * Setup %r10 value allows us to detect crossing a page boundary.
+	 * When %r10 goes positive we have crossed a page boundary and
+	 * need to do a nibble.
+	 */
+	lea	9(%rdi), %r10
+	and	$0xfff, %r10	/* offset into 4K page */
+	sub	$0x1000, %r10	/* subtract 4K pagesize */
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+
+	.p2align 4
+LABEL(loop_ashr_9_use):
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_9_use)
+
+LABEL(nibble_ashr_9_restart_use):
+	movdqa	(%rdi, %rdx), %xmm0
+
+	palignr $9, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	add	$16, %rdx
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_9_use)
+
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $9, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	$16, %rdx
+	jmp	LABEL(loop_ashr_9_use)
+
+	.p2align 4
+LABEL(nibble_ashr_9_use):
+	sub	$0x1000, %r10
+	movdqa	-16(%rdi, %rdx), %xmm0
+	psrldq	$9, %xmm0
+	pcmpistri      $0x3a,%xmm0, %xmm0
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	cmp	%r11, %rcx
+	jae	LABEL(nibble_ashr_exit_use)
+#endif
+	cmp	$6, %ecx
+	ja	LABEL(nibble_ashr_9_restart_use)
+
+	jmp	LABEL(nibble_ashr_exit_use)
+
+/*
+ *  The following cases will be handled by ashr_10
+ *  rcx(offset of rsi)  rax(offset of rdi)        relative offset	 corresponding case
+ *        n(6~15)          n - 6		  9(15 +(n - 6) - n)         ashr_10
+ */
+	.p2align 4
+LABEL(ashr_10):
+	pxor	%xmm0, %xmm0
+	movdqa	(%rdi), %xmm2
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	%xmm1, %xmm0
+	pslldq	$6, %xmm2
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm1, %xmm2
+	psubb	%xmm0, %xmm2
+	pmovmskb %xmm2, %r9d
+	shr	%cl, %edx
+	shr	%cl, %r9d
+	sub	%r9d, %edx
+	jnz	LABEL(less32bytes)
+	movdqa	(%rdi), %xmm3
+
+	UPDATE_STRNCMP_COUNTER
+
+	pxor	%xmm0, %xmm0
+	mov	$16, %rcx	/* index for loads */
+	mov	$10, %r9d	/* byte position left over from less32bytes case */
+	/*
+	 * Setup %r10 value allows us to detect crossing a page boundary.
+	 * When %r10 goes positive we have crossed a page boundary and
+	 * need to do a nibble.
+	 */
+	lea	10(%rdi), %r10
+	and	$0xfff, %r10	/* offset into 4K page */
+	sub	$0x1000, %r10	/* subtract 4K pagesize */
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+
+	.p2align 4
+LABEL(loop_ashr_10_use):
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_10_use)
+
+LABEL(nibble_ashr_10_restart_use):
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $10, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	add	$16, %rdx
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_10_use)
+
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $10, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	$16, %rdx
+	jmp	LABEL(loop_ashr_10_use)
+
+	.p2align 4
+LABEL(nibble_ashr_10_use):
+	sub	$0x1000, %r10
+	movdqa	-16(%rdi, %rdx), %xmm0
+	psrldq	$10, %xmm0
+	pcmpistri      $0x3a,%xmm0, %xmm0
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	cmp	%r11, %rcx
+	jae	LABEL(nibble_ashr_exit_use)
+#endif
+	cmp	$5, %ecx
+	ja	LABEL(nibble_ashr_10_restart_use)
+
+	jmp	LABEL(nibble_ashr_exit_use)
+
+/*
+ *  The following cases will be handled by ashr_11
+ *  rcx(offset of rsi)  rax(offset of rdi)        relative offset	 corresponding case
+ *        n(5~15)          n - 5		  10(15 +(n - 5) - n)         ashr_11
+ */
+	.p2align 4
+LABEL(ashr_11):
+	pxor	%xmm0, %xmm0
+	movdqa	(%rdi), %xmm2
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	%xmm1, %xmm0
+	pslldq	$5, %xmm2
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm1, %xmm2
+	psubb	%xmm0, %xmm2
+	pmovmskb %xmm2, %r9d
+	shr	%cl, %edx
+	shr	%cl, %r9d
+	sub	%r9d, %edx
+	jnz	LABEL(less32bytes)
+	movdqa	(%rdi), %xmm3
+
+	UPDATE_STRNCMP_COUNTER
+
+	pxor	%xmm0, %xmm0
+	mov	$16, %rcx	/* index for loads */
+	mov	$11, %r9d	/* byte position left over from less32bytes case */
+	/*
+	 * Setup %r10 value allows us to detect crossing a page boundary.
+	 * When %r10 goes positive we have crossed a page boundary and
+	 * need to do a nibble.
+	 */
+	lea	11(%rdi), %r10
+	and	$0xfff, %r10	/* offset into 4K page */
+	sub	$0x1000, %r10	/* subtract 4K pagesize */
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+
+	.p2align 4
+LABEL(loop_ashr_11_use):
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_11_use)
+
+LABEL(nibble_ashr_11_restart_use):
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $11, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	add	$16, %rdx
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_11_use)
+
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $11, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	$16, %rdx
+	jmp	LABEL(loop_ashr_11_use)
+
+	.p2align 4
+LABEL(nibble_ashr_11_use):
+	sub	$0x1000, %r10
+	movdqa	-16(%rdi, %rdx), %xmm0
+	psrldq	$11, %xmm0
+	pcmpistri      $0x3a,%xmm0, %xmm0
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	cmp	%r11, %rcx
+	jae	LABEL(nibble_ashr_exit_use)
+#endif
+	cmp	$4, %ecx
+	ja	LABEL(nibble_ashr_11_restart_use)
+
+	jmp	LABEL(nibble_ashr_exit_use)
+
+/*
+ *  The following cases will be handled by ashr_12
+ *  rcx(offset of rsi)  rax(offset of rdi)        relative offset	 corresponding case
+ *        n(4~15)          n - 4		  11(15 +(n - 4) - n)         ashr_12
+ */
+	.p2align 4
+LABEL(ashr_12):
+	pxor	%xmm0, %xmm0
+	movdqa	(%rdi), %xmm2
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	%xmm1, %xmm0
+	pslldq	$4, %xmm2
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm1, %xmm2
+	psubb	%xmm0, %xmm2
+	pmovmskb %xmm2, %r9d
+	shr	%cl, %edx
+	shr	%cl, %r9d
+	sub	%r9d, %edx
+	jnz	LABEL(less32bytes)
+	movdqa	(%rdi), %xmm3
+
+	UPDATE_STRNCMP_COUNTER
+
+	pxor	%xmm0, %xmm0
+	mov	$16, %rcx	/* index for loads */
+	mov	$12, %r9d	/* byte position left over from less32bytes case */
+	/*
+	 * Setup %r10 value allows us to detect crossing a page boundary.
+	 * When %r10 goes positive we have crossed a page boundary and
+	 * need to do a nibble.
+	 */
+	lea	12(%rdi), %r10
+	and	$0xfff, %r10	/* offset into 4K page */
+	sub	$0x1000, %r10	/* subtract 4K pagesize */
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+
+	.p2align 4
+LABEL(loop_ashr_12_use):
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_12_use)
+
+LABEL(nibble_ashr_12_restart_use):
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $12, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	add	$16, %rdx
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_12_use)
+
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $12, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	$16, %rdx
+	jmp	LABEL(loop_ashr_12_use)
+
+	.p2align 4
+LABEL(nibble_ashr_12_use):
+	sub	$0x1000, %r10
+	movdqa	-16(%rdi, %rdx), %xmm0
+	psrldq	$12, %xmm0
+	pcmpistri      $0x3a,%xmm0, %xmm0
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	cmp	%r11, %rcx
+	jae	LABEL(nibble_ashr_exit_use)
+#endif
+	cmp	$3, %ecx
+	ja	LABEL(nibble_ashr_12_restart_use)
+
+	jmp	LABEL(nibble_ashr_exit_use)
+
+/*
+ *  The following cases will be handled by ashr_13
+ *  rcx(offset of rsi)  rax(offset of rdi)        relative offset	 corresponding case
+ *        n(3~15)          n - 3		  12(15 +(n - 3) - n)         ashr_13
+ */
+	.p2align 4
+LABEL(ashr_13):
+	pxor	%xmm0, %xmm0
+	movdqa	(%rdi), %xmm2
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	%xmm1, %xmm0
+	pslldq	$3, %xmm2
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm1, %xmm2
+	psubb	%xmm0, %xmm2
+	pmovmskb %xmm2, %r9d
+	shr	%cl, %edx
+	shr	%cl, %r9d
+	sub	%r9d, %edx
+	jnz	LABEL(less32bytes)
+	movdqa	(%rdi), %xmm3
+
+	UPDATE_STRNCMP_COUNTER
+
+	pxor	%xmm0, %xmm0
+	mov	$16, %rcx	/* index for loads */
+	mov	$13, %r9d	/* byte position left over from less32bytes case */
+	/*
+	 * Setup %r10 value allows us to detect crossing a page boundary.
+	 * When %r10 goes positive we have crossed a page boundary and
+	 * need to do a nibble.
+	 */
+	lea	13(%rdi), %r10
+	and	$0xfff, %r10	/* offset into 4K page */
+	sub	$0x1000, %r10	/* subtract 4K pagesize */
+
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+
+	.p2align 4
+LABEL(loop_ashr_13_use):
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_13_use)
+
+LABEL(nibble_ashr_13_restart_use):
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $13, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	add	$16, %rdx
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_13_use)
+
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $13, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	$16, %rdx
+	jmp	LABEL(loop_ashr_13_use)
+
+	.p2align 4
+LABEL(nibble_ashr_13_use):
+	sub	$0x1000, %r10
+	movdqa	-16(%rdi, %rdx), %xmm0
+	psrldq	$13, %xmm0
+	pcmpistri      $0x3a,%xmm0, %xmm0
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	cmp	%r11, %rcx
+	jae	LABEL(nibble_ashr_exit_use)
+#endif
+	cmp	$2, %ecx
+	ja	LABEL(nibble_ashr_13_restart_use)
+
+	jmp	LABEL(nibble_ashr_exit_use)
+
+/*
+ *  The following cases will be handled by ashr_14
+ *  rcx(offset of rsi)  rax(offset of rdi)        relative offset	 corresponding case
+ *        n(2~15)          n - 2		  13(15 +(n - 2) - n)         ashr_14
+ */
+	.p2align 4
+LABEL(ashr_14):
+	pxor	%xmm0, %xmm0
+	movdqa	(%rdi), %xmm2
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	%xmm1, %xmm0
+	pslldq  $2, %xmm2
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm1, %xmm2
+	psubb	%xmm0, %xmm2
+	pmovmskb %xmm2, %r9d
+	shr	%cl, %edx
+	shr	%cl, %r9d
+	sub	%r9d, %edx
+	jnz	LABEL(less32bytes)
+	movdqa	(%rdi), %xmm3
+
+	UPDATE_STRNCMP_COUNTER
+
+	pxor	%xmm0, %xmm0
+	mov	$16, %rcx	/* index for loads */
+	mov	$14, %r9d	/* byte position left over from less32bytes case */
+	/*
+	 * Setup %r10 value allows us to detect crossing a page boundary.
+	 * When %r10 goes positive we have crossed a page boundary and
+	 * need to do a nibble.
+	 */
+	lea	14(%rdi), %r10
+	and	$0xfff, %r10	/* offset into 4K page */
+	sub	$0x1000, %r10	/* subtract 4K pagesize */
+
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+
+	.p2align 4
+LABEL(loop_ashr_14_use):
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_14_use)
+
+LABEL(nibble_ashr_14_restart_use):
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $14, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	add	$16, %rdx
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_14_use)
+
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $14, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	$16, %rdx
+	jmp	LABEL(loop_ashr_14_use)
+
+	.p2align 4
+LABEL(nibble_ashr_14_use):
+	sub	$0x1000, %r10
+	movdqa	-16(%rdi, %rdx), %xmm0
+	psrldq	$14, %xmm0
+	pcmpistri      $0x3a,%xmm0, %xmm0
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	cmp	%r11, %rcx
+	jae	LABEL(nibble_ashr_exit_use)
+#endif
+	cmp	$1, %ecx
+	ja	LABEL(nibble_ashr_14_restart_use)
+
+	jmp	LABEL(nibble_ashr_exit_use)
+
+/*
+ *  The following cases will be handled by ashr_15
+ *  rcx(offset of rsi)  rax(offset of rdi)        relative offset	 corresponding case
+ *        n(1~15)          n - 1		  14(15 +(n - 1) - n)         ashr_15
+ */
+	.p2align 4
+LABEL(ashr_15):
+	pxor	%xmm0, %xmm0
+	movdqa	(%rdi), %xmm2
+	movdqa	(%rsi), %xmm1
+	pcmpeqb	%xmm1, %xmm0
+	pslldq	$1, %xmm2
+	TOLOWER (%xmm1, %xmm2)
+	pcmpeqb	%xmm1, %xmm2
+	psubb	%xmm0, %xmm2
+	pmovmskb %xmm2, %r9d
+	shr	%cl, %edx
+	shr	%cl, %r9d
+	sub	%r9d, %edx
+	jnz	LABEL(less32bytes)
+
+	movdqa	(%rdi), %xmm3
+
+	UPDATE_STRNCMP_COUNTER
+
+	pxor	%xmm0, %xmm0
+	mov	$16, %rcx	/* index for loads */
+	mov	$15, %r9d	/* byte position left over from less32bytes case */
+	/*
+	 * Setup %r10 value allows us to detect crossing a page boundary.
+	 * When %r10 goes positive we have crossed a page boundary and
+	 * need to do a nibble.
+	 */
+	lea	15(%rdi), %r10
+	and	$0xfff, %r10	/* offset into 4K page */
+
+	sub	$0x1000, %r10	/* subtract 4K pagesize */
+
+	mov	%rcx, %rdx	/* only for offset of sse4 instruction loop*/
+
+	.p2align 4
+LABEL(loop_ashr_15_use):
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_15_use)
+
+LABEL(nibble_ashr_15_restart_use):
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $15, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+
+	add	$16, %rdx
+	add	$16, %r10
+	jg	LABEL(nibble_ashr_15_use)
+
+	movdqa	(%rdi, %rdx), %xmm0
+	palignr $15, -16(%rdi, %rdx), %xmm0
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri $0x1a, (%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	jbe	LABEL(exit_use)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	$16, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	$16, %rdx
+	jmp	LABEL(loop_ashr_15_use)
+
+	.p2align 4
+LABEL(nibble_ashr_15_use):
+	sub	$0x1000, %r10
+	movdqa	-16(%rdi, %rdx), %xmm0
+	psrldq	$15, %xmm0
+	pcmpistri      $0x3a,%xmm0, %xmm0
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	cmp	%r11, %rcx
+	jae	LABEL(nibble_ashr_exit_use)
+#endif
+	cmp	$0, %ecx
+	ja	LABEL(nibble_ashr_15_restart_use)
+
+LABEL(nibble_ashr_exit_use):
+#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
+	pcmpistri      $0x1a,(%rsi,%rdx), %xmm0
+#else
+	movdqa	(%rsi,%rdx), %xmm1
+	TOLOWER (%xmm0, %xmm1)
+	pcmpistri $0x1a, %xmm1, %xmm0
+#endif
+	.p2align 4
+LABEL(exit_use):
+	jnc	LABEL(strcmp_exitz)
+#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
+	sub	%rcx, %r11
+	jbe	LABEL(strcmp_exitz)
+#endif
+	add	%rcx, %rdx
+	lea	-16(%rdi, %r9), %rdi
+	movzbl	(%rdi, %rdx), %eax
+	movzbl	(%rsi, %rdx), %edx
+	test	%r8d, %r8d
+	jz	LABEL(ret_use)
+	xchg	%eax, %edx
+LABEL(ret_use):
+#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
+#endif
+
+	sub	%edx, %eax
+	ret
+
+LABEL(less32bytes):
+	lea	(%rdi, %rax), %rdi	/* locate the exact address for first operand(rdi) */
+	lea	(%rsi, %rcx), %rsi	/* locate the exact address for second operand(rsi) */
+	test	%r8d, %r8d
+	jz	LABEL(ret)
+	xchg	%rsi, %rdi		/* recover original order according to flag(%r8d) */
+
+	.p2align 4
+LABEL(ret):
+LABEL(less16bytes):
+	bsf	%rdx, %rdx		/* find and store bit index in %rdx */
+
+#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
+
+#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
+
+LABEL(strcmp_exitz):
+	xor	%eax, %eax
+	ret
+
+	.p2align 4
+	// XXX Same as code above
+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
+	cfi_endproc
+	.size	STRCMP_SSE42, .-STRCMP_SSE42
+
+#undef UCLOW_reg
+#undef UCHIGH_reg
+#undef LCQWORD_reg
+#undef TOLOWER
+
+	/* Put all SSE 4.2 functions together.  */
+	.section .rodata.SECTION,"a",@progbits
+	.p2align 3
+LABEL(unaligned_table):
+	.int	LABEL(ashr_1) - LABEL(unaligned_table)
+	.int	LABEL(ashr_2) - LABEL(unaligned_table)
+	.int	LABEL(ashr_3) - LABEL(unaligned_table)
+	.int	LABEL(ashr_4) - LABEL(unaligned_table)
+	.int	LABEL(ashr_5) - LABEL(unaligned_table)
+	.int	LABEL(ashr_6) - LABEL(unaligned_table)
+	.int	LABEL(ashr_7) - LABEL(unaligned_table)
+	.int	LABEL(ashr_8) - LABEL(unaligned_table)
+	.int	LABEL(ashr_9) - LABEL(unaligned_table)
+	.int	LABEL(ashr_10) - LABEL(unaligned_table)
+	.int	LABEL(ashr_11) - LABEL(unaligned_table)
+	.int	LABEL(ashr_12) - LABEL(unaligned_table)
+	.int	LABEL(ashr_13) - LABEL(unaligned_table)
+	.int	LABEL(ashr_14) - LABEL(unaligned_table)
+	.int	LABEL(ashr_15) - LABEL(unaligned_table)
+	.int	LABEL(ashr_0) - LABEL(unaligned_table)
+
+#undef LABEL
+#undef GLABEL
+#undef SECTION