Faster strrchr.

5 files changed, 2 insertions, 899 deletions

diff --git a/sysdeps/x86_64/multiarch/Makefile b/sysdeps/x86_64/multiarch/Makefile
index 5ab950a53f..9fd0fd64c5 100644
--- a/sysdeps/x86_64/multiarch/Makefile
+++ b/sysdeps/x86_64/multiarch/Makefile
@@ -8,7 +8,7 @@ ifeq ($(subdir),string)
 
 sysdep_routines += strncat-c stpncpy-c strncpy-c strcmp-ssse3 \
 		   strcmp-sse2-unaligned strncmp-ssse3 \
-		   strend-sse4 memcmp-sse4 memcpy-ssse3 \
+		   memcmp-sse4 memcpy-ssse3 \
 		   memcpy-sse2-unaligned mempcpy-ssse3 \
 		   memmove-ssse3 memcpy-ssse3-back mempcpy-ssse3-back \
 		   memmove-ssse3-back strcasestr-nonascii strcasecmp_l-ssse3 \
@@ -17,7 +17,7 @@ sysdep_routines += strncat-c stpncpy-c strncpy-c strcmp-ssse3 \
 		   strcpy-sse2-unaligned strncpy-sse2-unaligned \
 		   stpcpy-sse2-unaligned stpncpy-sse2-unaligned \
 		   strcat-sse2-unaligned strncat-sse2-unaligned \
-		   strrchr-sse2-no-bsf strchr-sse2-no-bsf memcmp-ssse3
+		   strchr-sse2-no-bsf memcmp-ssse3
 ifeq (yes,$(config-cflags-sse4))
 sysdep_routines += strcspn-c strpbrk-c strspn-c strstr-c strcasestr-c varshift
 CFLAGS-varshift.c += -msse4
diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
index 1a65ac04ff..71beab82e4 100644
--- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
@@ -176,12 +176,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 			      __strpbrk_sse42)
 	      IFUNC_IMPL_ADD (array, i, strpbrk, 1, __strpbrk_sse2))
 
-  /* Support sysdeps/x86_64/multiarch/strrchr.S.  */
-  IFUNC_IMPL (i, name, strrchr,
-	      IFUNC_IMPL_ADD (array, i, strrchr, HAS_SSE4_2,
-			      __strrchr_sse42)
-	      IFUNC_IMPL_ADD (array, i, strrchr, 1, __strrchr_sse2_no_bsf)
-	      IFUNC_IMPL_ADD (array, i, strrchr, 1, __strrchr_sse2))
 
   /* Support sysdeps/x86_64/multiarch/strspn.S.  */
   IFUNC_IMPL (i, name, strspn,
diff --git a/sysdeps/x86_64/multiarch/strend-sse4.S b/sysdeps/x86_64/multiarch/strend-sse4.S
deleted file mode 100644
index c5a7ae28a6..0000000000
--- a/sysdeps/x86_64/multiarch/strend-sse4.S
+++ /dev/null
@@ -1,48 +0,0 @@
-/* Return the pointer to the end of string, using SSE4.2
-   Copyright (C) 2009-2013 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, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-#include "asm-syntax.h"
-
-	.section .text.sse4.2,"ax",@progbits
-ENTRY (__strend_sse4)
-	pxor	%xmm2, %xmm2
-	movq	%rdi, %rcx
-	andq	$~15, %rdi
-	movdqa	%xmm2, %xmm1
-	pcmpeqb	(%rdi), %xmm2
-	orl	$0xffffffff, %esi
-	subq	%rdi, %rcx
-	shll	%cl, %esi
-	pmovmskb %xmm2, %edx
-	andl	%esi, %edx
-	jnz	1f
-
-2:	pcmpistri $0x08, 16(%rdi), %xmm1
-	leaq	16(%rdi), %rdi
-	jnz	2b
-
-	leaq	(%rdi,%rcx), %rax
-	ret
-
-1:	bsfl	%edx, %eax
-	addq	%rdi, %rax
-	ret
-
-END (__strend_sse4)
diff --git a/sysdeps/x86_64/multiarch/strrchr-sse2-no-bsf.S b/sysdeps/x86_64/multiarch/strrchr-sse2-no-bsf.S
deleted file mode 100644
index fcef610dbc..0000000000
--- a/sysdeps/x86_64/multiarch/strrchr-sse2-no-bsf.S
+++ /dev/null
@@ -1,555 +0,0 @@
-/* strrchr with SSE2 without bsf and bsr
-   Copyright (C) 2011-2013 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, see
-   <http://www.gnu.org/licenses/>.  */
-
-#if defined SHARED && !defined NOT_IN_libc
-
-# include <sysdep.h>
-# include "asm-syntax.h"
-
-	atom_text_section
-ENTRY (__strrchr_sse2_no_bsf)
-
-	movd	%rsi, %xmm1
-	pxor	%xmm2, %xmm2
-	mov	%rdi, %rcx
-	punpcklbw %xmm1, %xmm1
-	punpcklbw %xmm1, %xmm1
-	/* ECX has OFFSET. */
-	and	$63, %rcx
-	cmp	$48, %rcx
-	pshufd	$0, %xmm1, %xmm1
-	ja	L(crosscache)
-
-/* unaligned string. */
-	movdqu	(%rdi), %xmm0
-	pcmpeqb	%xmm0, %xmm2
-	pcmpeqb	%xmm1, %xmm0
-	/* Find where NULL is.  */
-	pmovmskb %xmm2, %rcx
-	/* Check if there is a match.  */
-	pmovmskb %xmm0, %rax
-	add	$16, %rdi
-
-	test	%rax, %rax
-	jnz	L(unaligned_match1)
-
-	test	%rcx, %rcx
-	jnz	L(return_null)
-
-	and	$-16, %rdi
-	xor	%r8, %r8
-	jmp	L(loop)
-
-	.p2align 4
-L(unaligned_match1):
-	test	%rcx, %rcx
-	jnz	L(prolog_find_zero_1)
-
-	mov	%rax, %r8
-	mov	%rdi, %rsi
-	and	$-16, %rdi
-	jmp	L(loop)
-
-	.p2align 4
-L(crosscache):
-/* Hancle unaligned string.  */
-	and	$15, %rcx
-	and	$-16, %rdi
-	pxor	%xmm3, %xmm3
-	movdqa	(%rdi), %xmm0
-	pcmpeqb	%xmm0, %xmm3
-	pcmpeqb	%xmm1, %xmm0
-	/* Find where NULL is.  */
-	pmovmskb %xmm3, %rdx
-	/* Check if there is a match.  */
-	pmovmskb %xmm0, %rax
-	/* Remove the leading bytes.  */
-	shr	%cl, %rdx
-	shr	%cl, %rax
-	add	$16, %rdi
-
-	test	%rax, %rax
-	jnz	L(unaligned_match)
-
-	test	%rdx, %rdx
-	jnz	L(return_null)
-
-	xor	%r8, %r8
-	jmp	L(loop)
-
-	.p2align 4
-L(unaligned_match):
-	test	%rdx, %rdx
-	jnz	L(prolog_find_zero)
-
-	mov	%rax, %r8
-	lea	(%rdi, %rcx), %rsi
-
-/* Loop start on aligned string.  */
-	.p2align 4
-L(loop):
-	movdqa	(%rdi), %xmm0
-	pcmpeqb	%xmm0, %xmm2
-	add	$16, %rdi
-	pcmpeqb	%xmm1, %xmm0
-	pmovmskb %xmm2, %rcx
-	pmovmskb %xmm0, %rax
-	or	%rax, %rcx
-	jnz	L(matches)
-
-	movdqa	(%rdi), %xmm0
-	pcmpeqb	%xmm0, %xmm2
-	add	$16, %rdi
-	pcmpeqb	%xmm1, %xmm0
-	pmovmskb %xmm2, %rcx
-	pmovmskb %xmm0, %rax
-	or	%rax, %rcx
-	jnz	L(matches)
-
-	movdqa	(%rdi), %xmm0
-	pcmpeqb	%xmm0, %xmm2
-	add	$16, %rdi
-	pcmpeqb	%xmm1, %xmm0
-	pmovmskb %xmm2, %rcx
-	pmovmskb %xmm0, %rax
-	or	%rax, %rcx
-	jnz	L(matches)
-
-	movdqa	(%rdi), %xmm0
-	pcmpeqb	%xmm0, %xmm2
-	add	$16, %rdi
-	pcmpeqb	%xmm1, %xmm0
-	pmovmskb %xmm2, %rcx
-	pmovmskb %xmm0, %rax
-	or	%rax, %rcx
-	jz	L(loop)
-
-L(matches):
-	test	%rax, %rax
-	jnz	L(match)
-L(return_value):
-	test	%r8, %r8
-	jz	L(return_null)
-	mov	%r8, %rax
-	mov	%rsi, %rdi
-	jmp	L(match_exit)
-
-	.p2align 4
-L(match):
-	pmovmskb %xmm2, %rcx
-	test	%rcx, %rcx
-	jnz	L(find_zero)
-	mov	%rax, %r8
-	mov	%rdi, %rsi
-	jmp	L(loop)
-
-	.p2align 4
-L(find_zero):
-	test	%cl, %cl
-	jz	L(find_zero_high)
-	mov	%cl, %dl
-	and	$15, %dl
-	jz	L(find_zero_8)
-	test	$0x01, %cl
-	jnz	L(FindZeroExit1)
-	test	$0x02, %cl
-	jnz	L(FindZeroExit2)
-	test	$0x04, %cl
-	jnz	L(FindZeroExit3)
-	and	$1 << 4 - 1, %rax
-	jz	L(return_value)
-	jmp	L(match_exit)
-
-	.p2align 4
-L(find_zero_8):
-	test	$0x10, %cl
-	jnz	L(FindZeroExit5)
-	test	$0x20, %cl
-	jnz	L(FindZeroExit6)
-	test	$0x40, %cl
-	jnz	L(FindZeroExit7)
-	and	$1 << 8 - 1, %rax
-	jz	L(return_value)
-	jmp	L(match_exit)
-
-	.p2align 4
-L(find_zero_high):
-	mov	%ch, %dh
-	and	$15, %dh
-	jz	L(find_zero_high_8)
-	test	$0x01, %ch
-	jnz	L(FindZeroExit9)
-	test	$0x02, %ch
-	jnz	L(FindZeroExit10)
-	test	$0x04, %ch
-	jnz	L(FindZeroExit11)
-	and	$1 << 12 - 1, %rax
-	jz	L(return_value)
-	jmp	L(match_exit)
-
-	.p2align 4
-L(find_zero_high_8):
-	test	$0x10, %ch
-	jnz	L(FindZeroExit13)
-	test	$0x20, %ch
-	jnz	L(FindZeroExit14)
-	test	$0x40, %ch
-	jnz	L(FindZeroExit15)
-	and	$1 << 16 - 1, %rax
-	jz	L(return_value)
-	jmp	L(match_exit)
-
-	.p2align 4
-L(FindZeroExit1):
-	and	$1, %rax
-	jz	L(return_value)
-	jmp	L(match_exit)
-
-	.p2align 4
-L(FindZeroExit2):
-	and	$1 << 2 - 1, %rax
-	jz	L(return_value)
-	jmp	L(match_exit)
-
-	.p2align 4
-L(FindZeroExit3):
-	and	$1 << 3 - 1, %rax
-	jz	L(return_value)
-	jmp	L(match_exit)
-
-	.p2align 4
-L(FindZeroExit5):
-	and	$1 << 5 - 1, %rax
-	jz	L(return_value)
-	jmp	L(match_exit)
-
-	.p2align 4
-L(FindZeroExit6):
-	and	$1 << 6 - 1, %rax
-	jz	L(return_value)
-	jmp	L(match_exit)
-
-	.p2align 4
-L(FindZeroExit7):
-	and	$1 << 7 - 1, %rax
-	jz	L(return_value)
-	jmp	L(match_exit)
-
-	.p2align 4
-L(FindZeroExit9):
-	and	$1 << 9 - 1, %rax
-	jz	L(return_value)
-	jmp	L(match_exit)
-
-	.p2align 4
-L(FindZeroExit10):
-	and	$1 << 10 - 1, %rax
-	jz	L(return_value)
-	jmp	L(match_exit)
-
-	.p2align 4
-L(FindZeroExit11):
-	and	$1 << 11 - 1, %rax
-	jz	L(return_value)
-	jmp	L(match_exit)
-
-	.p2align 4
-L(FindZeroExit13):
-	and	$1 << 13 - 1, %rax
-	jz	L(return_value)
-	jmp	L(match_exit)
-
-	.p2align 4
-L(FindZeroExit14):
-	and	$1 << 14 - 1, %rax
-	jz	L(return_value)
-	jmp	L(match_exit)
-
-	.p2align 4
-L(FindZeroExit15):
-	and	$1 << 15 - 1, %rax
-	jz	L(return_value)
-
-	.p2align 4
-L(match_exit):
-	test	%ah, %ah
-	jnz	L(match_exit_high)
-	mov	%al, %dl
-	and	$15 << 4, %dl
-	jnz	L(match_exit_8)
-	test	$0x08, %al
-	jnz	L(Exit4)
-	test	$0x04, %al
-	jnz	L(Exit3)
-	test	$0x02, %al
-	jnz	L(Exit2)
-	lea	-16(%rdi), %rax
-	ret
-
-	.p2align 4
-L(match_exit_8):
-	test	$0x80, %al
-	jnz	L(Exit8)
-	test	$0x40, %al
-	jnz	L(Exit7)
-	test	$0x20, %al
-	jnz	L(Exit6)
-	lea	-12(%rdi), %rax
-	ret
-
-	.p2align 4
-L(match_exit_high):
-	mov	%ah, %dh
-	and	$15 << 4, %dh
-	jnz	L(match_exit_high_8)
-	test	$0x08, %ah
-	jnz	L(Exit12)
-	test	$0x04, %ah
-	jnz	L(Exit11)
-	test	$0x02, %ah
-	jnz	L(Exit10)
-	lea	-8(%rdi), %rax
-	ret
-
-	.p2align 4
-L(match_exit_high_8):
-	test	$0x80, %ah
-	jnz	L(Exit16)
-	test	$0x40, %ah
-	jnz	L(Exit15)
-	test	$0x20, %ah
-	jnz	L(Exit14)
-	lea	-4(%rdi), %rax
-	ret
-
-	.p2align 4
-L(Exit2):
-	lea	-15(%rdi), %rax
-	ret
-
-	.p2align 4
-L(Exit3):
-	lea	-14(%rdi), %rax
-	ret
-
-	.p2align 4
-L(Exit4):
-	lea	-13(%rdi), %rax
-	ret
-
-	.p2align 4
-L(Exit6):
-	lea	-11(%rdi), %rax
-	ret
-
-	.p2align 4
-L(Exit7):
-	lea	-10(%rdi), %rax
-	ret
-
-	.p2align 4
-L(Exit8):
-	lea	-9(%rdi), %rax
-	ret
-
-	.p2align 4
-L(Exit10):
-	lea	-7(%rdi), %rax
-	ret
-
-	.p2align 4
-L(Exit11):
-	lea	-6(%rdi), %rax
-	ret
-
-	.p2align 4
-L(Exit12):
-	lea	-5(%rdi), %rax
-	ret
-
-	.p2align 4
-L(Exit14):
-	lea	-3(%rdi), %rax
-	ret
-
-	.p2align 4
-L(Exit15):
-	lea	-2(%rdi), %rax
-	ret
-
-	.p2align 4
-L(Exit16):
-	lea	-1(%rdi), %rax
-	ret
-
-/* Return NULL.  */
-	.p2align 4
-L(return_null):
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(prolog_find_zero):
-	add	%rcx, %rdi
-	mov     %rdx, %rcx
-L(prolog_find_zero_1):
-	test	%cl, %cl
-	jz	L(prolog_find_zero_high)
-	mov	%cl, %dl
-	and	$15, %dl
-	jz	L(prolog_find_zero_8)
-	test	$0x01, %cl
-	jnz	L(PrologFindZeroExit1)
-	test	$0x02, %cl
-	jnz	L(PrologFindZeroExit2)
-	test	$0x04, %cl
-	jnz	L(PrologFindZeroExit3)
-	and	$1 << 4 - 1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(prolog_find_zero_8):
-	test	$0x10, %cl
-	jnz	L(PrologFindZeroExit5)
-	test	$0x20, %cl
-	jnz	L(PrologFindZeroExit6)
-	test	$0x40, %cl
-	jnz	L(PrologFindZeroExit7)
-	and	$1 << 8 - 1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(prolog_find_zero_high):
-	mov	%ch, %dh
-	and	$15, %dh
-	jz	L(prolog_find_zero_high_8)
-	test	$0x01, %ch
-	jnz	L(PrologFindZeroExit9)
-	test	$0x02, %ch
-	jnz	L(PrologFindZeroExit10)
-	test	$0x04, %ch
-	jnz	L(PrologFindZeroExit11)
-	and	$1 << 12 - 1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(prolog_find_zero_high_8):
-	test	$0x10, %ch
-	jnz	L(PrologFindZeroExit13)
-	test	$0x20, %ch
-	jnz	L(PrologFindZeroExit14)
-	test	$0x40, %ch
-	jnz	L(PrologFindZeroExit15)
-	and	$1 << 16 - 1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(PrologFindZeroExit1):
-	and	$1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(PrologFindZeroExit2):
-	and	$1 << 2 - 1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(PrologFindZeroExit3):
-	and	$1 << 3 - 1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(PrologFindZeroExit5):
-	and	$1 << 5 - 1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(PrologFindZeroExit6):
-	and	$1 << 6 - 1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(PrologFindZeroExit7):
-	and	$1 << 7 - 1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(PrologFindZeroExit9):
-	and	$1 << 9 - 1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(PrologFindZeroExit10):
-	and	$1 << 10 - 1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(PrologFindZeroExit11):
-	and	$1 << 11 - 1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(PrologFindZeroExit13):
-	and	$1 << 13 - 1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(PrologFindZeroExit14):
-	and	$1 << 14 - 1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-	.p2align 4
-L(PrologFindZeroExit15):
-	and	$1 << 15 - 1, %rax
-	jnz	L(match_exit)
-	xor	%rax, %rax
-	ret
-
-END (__strrchr_sse2_no_bsf)
-#endif
diff --git a/sysdeps/x86_64/multiarch/strrchr.S b/sysdeps/x86_64/multiarch/strrchr.S
deleted file mode 100644
index 3f92a41ef9..0000000000
--- a/sysdeps/x86_64/multiarch/strrchr.S
+++ /dev/null
@@ -1,288 +0,0 @@
-/* Multiple versions of strrchr
-   All versions must be listed in ifunc-impl-list.c.
-   Copyright (C) 2009-2013 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
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-#include <init-arch.h>
-
-
-/* Define multiple versions only for the definition in libc and for
-   the DSO.  In static binaries we need strrchr before the initialization
-   happened.  */
-#if defined SHARED && !defined NOT_IN_libc
-	.text
-ENTRY(strrchr)
-	.type	strrchr, @gnu_indirect_function
-	cmpl	$0, __cpu_features+KIND_OFFSET(%rip)
-	jne	1f
-	call	__init_cpu_features
-1:	leaq	__strrchr_sse2(%rip), %rax
-	testl	$bit_Slow_SSE4_2, __cpu_features+CPUID_OFFSET+index_Slow_SSE4_2(%rip)
-	jnz	2f
-	testl	$bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip)
-	jz	2f
-	leaq	__strrchr_sse42(%rip), %rax
-	ret
-2:	testl	$bit_Slow_BSF, __cpu_features+FEATURE_OFFSET+index_Slow_BSF(%rip)
-	jz	3f
-	leaq    __strrchr_sse2_no_bsf(%rip), %rax
-3:	ret
-END(strrchr)
-
-/*
-   This implementation uses SSE4 instructions to compare up to 16 bytes
-   at a time looking for the last occurrence of the character c in the
-   string s:
-
-   char *strrchr (const char *s, int c);
-
-   We use 0x4a:
-	_SIDD_SBYTE_OPS
-	| _SIDD_CMP_EQUAL_EACH
-	| _SIDD_MOST_SIGNIFICANT
-   on pcmpistri to compare xmm/mem128
-
-   0 1 2 3 4 5 6 7 8 9 A B C D E F
-   X X X X X X X X X X X X X X X X
-
-   against xmm
-
-   0 1 2 3 4 5 6 7 8 9 A B C D E F
-   C C C C C C C C C C C C C C C C
-
-   to find out if the first 16byte data element has a byte C and the
-   last offset.  There are 4 cases:
-
-   1. The first 16byte data element has EOS and has the byte C at the
-      last offset X.
-   2. The first 16byte data element is valid and has the byte C at the
-      last offset X.
-   3. The first 16byte data element has EOS and doesn't have the byte C.
-   4. The first 16byte data element is valid and doesn't have the byte C.
-
-   Here is the table of ECX, CFlag, ZFlag and SFlag for 3 cases:
-
-   case		ECX	CFlag	ZFlag	SFlag
-    1		 X	  1	  1	  0
-    2		 X	  1	  0	  0
-    3		16	  0	  1	  0
-    4		16	  0	  0	  0
-
-   We exit from the loop for cases 1 and 3 with jz which branches
-   when ZFlag is 1.  If CFlag == 1, ECX has the offset X for case 1.  */
-
-
-	.section .text.sse4.2,"ax",@progbits
-	.align	16
-	.type	__strrchr_sse42, @function
-	.globl	__strrchr_sse42
-	.hidden	__strrchr_sse42
-__strrchr_sse42:
-	cfi_startproc
-	CALL_MCOUNT
-	testb	%sil, %sil
-	je	__strend_sse4
-	xor	%eax,%eax	/* RAX has the last occurrence of s.  */
-	movd	%esi, %xmm1
-	punpcklbw	%xmm1, %xmm1
-	movl	%edi, %esi
-	punpcklbw	%xmm1, %xmm1
-	andl	$15, %esi
-	pshufd	$0, %xmm1, %xmm1
-	movq	%rdi, %r8
-	je	L(loop)
-
-/* Handle unaligned string using psrldq.  */
-	leaq	L(psrldq_table)(%rip), %rdx
-	andq	$-16, %r8
-	movslq	(%rdx,%rsi,4),%r9
-	movdqa	(%r8), %xmm0
-	addq	%rdx, %r9
-	jmp	*%r9
-
-/* Handle unaligned string with offset 1 using psrldq.  */
-	.p2align 4
-L(psrldq_1):
-	psrldq	$1, %xmm0
-
-	.p2align 4
-L(unaligned_pcmpistri):
-	pcmpistri	$0x4a, %xmm1, %xmm0
-	jnc	L(unaligned_no_byte)
-	leaq	(%rdi,%rcx), %rax
-L(unaligned_no_byte):
-	/* Find the length of the unaligned string.  */
-	pcmpistri	$0x3a, %xmm0, %xmm0
-	movl	$16, %edx
-	subl	%esi, %edx
-	cmpl	%ecx, %edx
-	/* Return RAX if the unaligned fragment to next 16B already
-	   contain the NULL terminator.  */
-	jg	L(exit)
-	addq	$16, %r8
-
-/* Loop start on aligned string.  */
-	.p2align 4
-L(loop):
-	pcmpistri	$0x4a, (%r8), %xmm1
-	jbe	L(match_or_eos)
-	addq	$16, %r8
-	jmp	L(loop)
-	.p2align 4
-L(match_or_eos):
-	je	L(had_eos)
-L(match_no_eos):
-	leaq	(%r8,%rcx), %rax
-	addq	$16, %r8
-	jmp     L(loop)
-	.p2align 4
-L(had_eos):
-	jnc     L(exit)
-	leaq	(%r8,%rcx), %rax
-	.p2align 4
-L(exit):
-	ret
-
-/* Handle unaligned string with offset 15 using psrldq.  */
-	.p2align 4
-L(psrldq_15):
-	psrldq	$15, %xmm0
-	jmp	L(unaligned_pcmpistri)
-
-/* Handle unaligned string with offset 14 using psrldq.  */
-	.p2align 4
-L(psrldq_14):
-	psrldq	$14, %xmm0
-	jmp	L(unaligned_pcmpistri)
-
-/* Handle unaligned string with offset 13 using psrldq.  */
-	.p2align 4
-L(psrldq_13):
-	psrldq	$13, %xmm0
-	jmp	L(unaligned_pcmpistri)
-
-/* Handle unaligned string with offset 12 using psrldq.  */
-	.p2align 4
-L(psrldq_12):
-	psrldq	$12, %xmm0
-	jmp	L(unaligned_pcmpistri)
-
-/* Handle unaligned string with offset 11 using psrldq.  */
-	.p2align 4
-L(psrldq_11):
-	psrldq	$11, %xmm0
-	jmp	L(unaligned_pcmpistri)
-
-/* Handle unaligned string with offset 10 using psrldq.  */
-	.p2align 4
-L(psrldq_10):
-	psrldq	$10, %xmm0
-	jmp	L(unaligned_pcmpistri)
-
-/* Handle unaligned string with offset 9 using psrldq.  */
-	.p2align 4
-L(psrldq_9):
-	psrldq	$9, %xmm0
-	jmp	L(unaligned_pcmpistri)
-
-/* Handle unaligned string with offset 8 using psrldq.  */
-	.p2align 4
-L(psrldq_8):
-	psrldq	$8, %xmm0
-	jmp	L(unaligned_pcmpistri)
-
-/* Handle unaligned string with offset 7 using psrldq.  */
-	.p2align 4
-L(psrldq_7):
-	psrldq	$7, %xmm0
-	jmp	L(unaligned_pcmpistri)
-
-/* Handle unaligned string with offset 6 using psrldq.  */
-	.p2align 4
-L(psrldq_6):
-	psrldq	$6, %xmm0
-	jmp	L(unaligned_pcmpistri)
-
-/* Handle unaligned string with offset 5 using psrldq.  */
-	.p2align 4
-L(psrldq_5):
-	psrldq	$5, %xmm0
-	jmp	L(unaligned_pcmpistri)
-
-/* Handle unaligned string with offset 4 using psrldq.  */
-	.p2align 4
-L(psrldq_4):
-	psrldq	$4, %xmm0
-	jmp	L(unaligned_pcmpistri)
-
-/* Handle unaligned string with offset 3 using psrldq.  */
-	.p2align 4
-L(psrldq_3):
-	psrldq	$3, %xmm0
-	jmp	L(unaligned_pcmpistri)
-
-/* Handle unaligned string with offset 2 using psrldq.  */
-	.p2align 4
-L(psrldq_2):
-	psrldq	$2, %xmm0
-	jmp	L(unaligned_pcmpistri)
-
-	cfi_endproc
-	.size	__strrchr_sse42, .-__strrchr_sse42
-
-	.section .rodata.sse4.2,"a",@progbits
-	.p2align 4
-L(psrldq_table):
-	.int	L(loop) - L(psrldq_table)
-	.int	L(psrldq_1) - L(psrldq_table)
-	.int	L(psrldq_2) - L(psrldq_table)
-	.int	L(psrldq_3) - L(psrldq_table)
-	.int	L(psrldq_4) - L(psrldq_table)
-	.int	L(psrldq_5) - L(psrldq_table)
-	.int	L(psrldq_6) - L(psrldq_table)
-	.int	L(psrldq_7) - L(psrldq_table)
-	.int	L(psrldq_8) - L(psrldq_table)
-	.int	L(psrldq_9) - L(psrldq_table)
-	.int	L(psrldq_10) - L(psrldq_table)
-	.int	L(psrldq_11) - L(psrldq_table)
-	.int	L(psrldq_12) - L(psrldq_table)
-	.int	L(psrldq_13) - L(psrldq_table)
-	.int	L(psrldq_14) - L(psrldq_table)
-	.int	L(psrldq_15) - L(psrldq_table)
-
-
-# undef ENTRY
-# define ENTRY(name) \
-	.type __strrchr_sse2, @function; \
-	.align 16; \
-	.globl __strrchr_sse2; \
-	.hidden __strrchr_sse2; \
-	__strrchr_sse2: cfi_startproc; \
-	CALL_MCOUNT
-# undef END
-# define END(name) \
-	cfi_endproc; .size __strrchr_sse2, .-__strrchr_sse2
-# undef libc_hidden_builtin_def
-/* It doesn't make sense to send libc-internal strrchr calls through a PLT.
-   The speedup we get from using SSE4.2 instruction is likely eaten away
-   by the indirect call in the PLT.  */
-# define libc_hidden_builtin_def(name) \
-	.globl __GI_strrchr; __GI_strrchr = __strrchr_sse2
-#endif
-
-#include "../strrchr.S"