x86: Move strcmp SSE42 implementation to multiarch/strcmp-sse4_2.S

This commit doesn't affect libc.so.6, its just housekeeping to prepare
for adding explicit ISA level support.

Tested build on x86_64 and x86_32 with/without multiarch.

5 files changed, 1766 insertions, 1792 deletions

diff --git a/sysdeps/x86_64/multiarch/strcasecmp_l-sse4_2.S b/sysdeps/x86_64/multiarch/strcasecmp_l-sse4_2.S
index 411ab7d283..ac03b95756 100644
--- a/sysdeps/x86_64/multiarch/strcasecmp_l-sse4_2.S
+++ b/sysdeps/x86_64/multiarch/strcasecmp_l-sse4_2.S
@@ -16,6 +16,5 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
-#define STRCMP_SSE42 __strcasecmp_l_sse42
 #define USE_AS_STRCASECMP_L
-#include "strcmp-sse42.S"
+#include "strcmp-sse4_2.S"
diff --git a/sysdeps/x86_64/multiarch/strcmp-sse42.S b/sysdeps/x86_64/multiarch/strcmp-sse42.S
deleted file mode 100644
index 60313c647a..0000000000
--- a/sysdeps/x86_64/multiarch/strcmp-sse42.S
+++ /dev/null
@@ -1,1782 +0,0 @@
-/* strcmp with SSE4.2
-   Copyright (C) 2009-2022 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-
-#ifndef STRCMP_SSE42
-# define STRCMP_SSE42	__strcmp_sse42
-#endif
-
-#if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
-# include "locale-defines.h"
-#endif
-
-#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
-/* Since the counter, %r11, is unsigned, we branch to strcmp_exitz
-   if the new counter > the old one or is 0.  */
-# define UPDATE_STRNCMP_COUNTER				\
-	/* calculate left number to compare */		\
-	lea	-16(%rcx, %r11), %r9;			\
-	cmp	%r9, %r11;				\
-	jb	LABEL(strcmp_exitz);			\
-	test	%r9, %r9;				\
-	je	LABEL(strcmp_exitz);			\
-	mov	%r9, %r11
-#else
-# define UPDATE_STRNCMP_COUNTER
-#endif
-
-#define SECTION	sse4.2
-#define GLABEL(l)	l##_sse42
-
-#define LABEL(l)	.L##l
-
-/* 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
-	.globl	STRCMP_SSE42
-#ifdef USE_AS_STRCASECMP_L
-ENTRY (GLABEL(__strcasecmp))
-	movq	__libc_tsd_LOCALE@gottpoff(%rip),%rax
-	mov	%fs:(%rax),%RDX_LP
-
-	/* Either 1 or 5 bytes (dependeing if CET is enabled).  */
-	.p2align 4
-END (GLABEL(__strcasecmp))
-	/* FALLTHROUGH to strcasecmp_l.  */
-#endif
-#ifdef USE_AS_STRNCASECMP_L
-ENTRY (GLABEL(__strncasecmp))
-	movq	__libc_tsd_LOCALE@gottpoff(%rip),%rax
-	mov	%fs:(%rax),%RCX_LP
-
-	/* Either 1 or 5 bytes (dependeing if CET is enabled).  */
-	.p2align 4
-END (GLABEL(__strncasecmp))
-	/* FALLTHROUGH to strncasecmp_l.  */
-#endif
-
-
-#define arg arg
-
-STRCMP_SSE42:
-	cfi_startproc
-	_CET_ENDBR
-	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
-	mov	LOCALE_T___LOCALES+LC_CTYPE*LP_SIZE(%rdx), %RAX_LP
-# else
-	mov	(%rdx), %RAX_LP
-# endif
-	testl	$1, 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
-	mov	LOCALE_T___LOCALES+LC_CTYPE*LP_SIZE(%rcx), %RAX_LP
-# else
-	mov	(%rcx), %RAX_LP
-# endif
-	testl	$1, 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_LP, %RDX_LP
-	je	LABEL(strcmp_exitz)
-	cmp	$1, %RDX_LP
-	je	LABEL(Byte0)
-	mov	%RDX_LP, %R11_LP
-#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(lcase_min):
-	.quad	0x3f3f3f3f3f3f3f3f
-	.quad	0x3f3f3f3f3f3f3f3f
-LABEL(lcase_max):
-	.quad	0x9999999999999999
-	.quad	0x9999999999999999
-LABEL(case_add):
-	.quad	0x2020202020202020
-	.quad	0x2020202020202020
-	.previous
-	movdqa	LABEL(lcase_min)(%rip), %xmm4
-# define LCASE_MIN_reg %xmm4
-	movdqa	LABEL(lcase_max)(%rip), %xmm5
-# define LCASE_MAX_reg %xmm5
-	movdqa	LABEL(case_add)(%rip), %xmm6
-# define CASE_ADD_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
-# define TOLOWER(reg1, reg2) \
-	movdqa	LCASE_MIN_reg, %xmm7;					\
-	movdqa	LCASE_MIN_reg, %xmm8;					\
-	paddb	reg1, %xmm7;					\
-	paddb	reg2, %xmm8;					\
-	pcmpgtb	LCASE_MAX_reg, %xmm7;				\
-	pcmpgtb	LCASE_MAX_reg, %xmm8;				\
-	pandn	CASE_ADD_reg, %xmm7;					\
-	pandn	CASE_ADD_reg, %xmm8;					\
-	paddb	%xmm7, reg1;					\
-	paddb	%xmm8, reg2
-
-	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 comparison */
-#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 */
-	pxor	%xmm0, %xmm0		/* clear %xmm0 for null char check */
-	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):
-	movdqa	(%rdi), %xmm2
-	movdqa	(%rsi), %xmm1
-	lea	15(%rax), %r9
-	sub	%rcx, %r9
-	lea	LABEL(unaligned_table)(%rip), %r10
-	movslq	(%r10, %r9,4), %r9
-	pcmpeqb	%xmm1, %xmm0		/* Any null chars? */
-	lea	(%r10, %r9), %r10
-	_CET_NOTRACK 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
-	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
-
-	/*
-	 * 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):
-	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
-
-	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):
-	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
-
-	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):
-	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
-
-	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):
-	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
-
-	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):
-	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
-
-	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*/