/* fast SSE2 memrchr with 64 byte loop and pmaxub instruction using

   Copyright (C) 2011-2018 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>

	.text

ENTRY (__memrchr)

	movd	%esi, %xmm1

	sub	$16, %rdx

	jbe	L(length_less16)

	punpcklbw	%xmm1, %xmm1

	punpcklbw	%xmm1, %xmm1

	add	%rdx, %rdi

	pshufd	$0, %xmm1, %xmm1

	movdqu	(%rdi), %xmm0

	pcmpeqb	%xmm1, %xmm0

/* Check if there is a match.  */

	pmovmskb	%xmm0, %eax

	test	%eax, %eax

	jnz	L(matches0)

	sub	$64, %rdi

	mov	%edi, %ecx

	and	$15, %ecx

	jz	L(loop_prolog)

	add	$16, %rdi

	add	$16, %rdx

	and	$-16, %rdi

	sub	%rcx, %rdx

	.p2align 4

L(loop_prolog):

	sub	$64, %rdx

	jbe	L(exit_loop)

	movdqa	48(%rdi), %xmm0

	pcmpeqb	%xmm1, %xmm0

	pmovmskb	%xmm0, %eax

	test	%eax, %eax

	jnz	L(matches48)

	movdqa	32(%rdi), %xmm2

	pcmpeqb	%xmm1, %xmm2

	pmovmskb	%xmm2, %eax

	test	%eax, %eax

	jnz	L(matches32)

	movdqa	16(%rdi), %xmm3

	pcmpeqb	%xmm1, %xmm3

	pmovmskb	%xmm3, %eax

	test	%eax, %eax

	jnz	L(matches16)

	movdqa	(%rdi), %xmm4

	pcmpeqb	%xmm1, %xmm4

	pmovmskb	%xmm4, %eax

	test	%eax, %eax

	jnz	L(matches0)

	sub	$64, %rdi

	sub	$64, %rdx

	jbe	L(exit_loop)

	movdqa	48(%rdi), %xmm0

	pcmpeqb	%xmm1, %xmm0

	pmovmskb	%xmm0, %eax

	test	%eax, %eax

	jnz	L(matches48)

	movdqa	32(%rdi), %xmm2

	pcmpeqb	%xmm1, %xmm2

	pmovmskb	%xmm2, %eax

	test	%eax, %eax

	jnz	L(matches32)

	movdqa	16(%rdi), %xmm3

	pcmpeqb	%xmm1, %xmm3

	pmovmskb	%xmm3, %eax

	test	%eax, %eax

	jnz	L(matches16)

	movdqa	(%rdi), %xmm3

	pcmpeqb	%xmm1, %xmm3

	pmovmskb	%xmm3, %eax

	test	%eax, %eax

	jnz	L(matches0)

	mov	%edi, %ecx

	and	$63, %ecx

	jz	L(align64_loop)

	add	$64, %rdi

	add	$64, %rdx

	and	$-64, %rdi

	sub	%rcx, %rdx

	.p2align 4

L(align64_loop):

	sub	$64, %rdi

	sub	$64, %rdx

	jbe	L(exit_loop)

	movdqa	(%rdi), %xmm0

	movdqa	16(%rdi), %xmm2

	movdqa	32(%rdi), %xmm3

	movdqa	48(%rdi), %xmm4

	pcmpeqb	%xmm1, %xmm0

	pcmpeqb	%xmm1, %xmm2

	pcmpeqb	%xmm1, %xmm3

	pcmpeqb	%xmm1, %xmm4

	pmaxub	%xmm3, %xmm0

	pmaxub	%xmm4, %xmm2

	pmaxub	%xmm0, %xmm2

	pmovmskb	%xmm2, %eax

	test	%eax, %eax

	jz	L(align64_loop)

	pmovmskb	%xmm4, %eax

	test	%eax, %eax

	jnz	L(matches48)

	pmovmskb	%xmm3, %eax

	test	%eax, %eax

	jnz	L(matches32)

	movdqa	16(%rdi), %xmm2

	pcmpeqb	%xmm1, %xmm2

	pcmpeqb	(%rdi), %xmm1

	pmovmskb	%xmm2, %eax

	test	%eax, %eax

	jnz	L(matches16)

	pmovmskb	%xmm1, %eax

	bsr	%eax, %eax

	add	%rdi, %rax

	ret

	.p2align 4

L(exit_loop):

	add	$64, %edx

	cmp	$32, %edx

	jbe	L(exit_loop_32)

	movdqa	48(%rdi), %xmm0

	pcmpeqb	%xmm1, %xmm0

	pmovmskb	%xmm0, %eax

	test	%eax, %eax

	jnz	L(matches48)

	movdqa	32(%rdi), %xmm2

	pcmpeqb	%xmm1, %xmm2

	pmovmskb	%xmm2, %eax

	test	%eax, %eax

	jnz	L(matches32)

	movdqa	16(%rdi), %xmm3

	pcmpeqb	%xmm1, %xmm3

	pmovmskb	%xmm3, %eax

	test	%eax, %eax

	jnz	L(matches16_1)

	cmp	$48, %edx

	jbe	L(return_null)

	pcmpeqb	(%rdi), %xmm1

	pmovmskb	%xmm1, %eax

	test	%eax, %eax

	jnz	L(matches0_1)

	xor	%eax, %eax

	ret

	.p2align 4

L(exit_loop_32):

	movdqa	48(%rdi), %xmm0

	pcmpeqb	%xmm1, %xmm0

	pmovmskb	%xmm0, %eax

	test	%eax, %eax

	jnz	L(matches48_1)

	cmp	$16, %edx

	jbe	L(return_null)

	pcmpeqb	32(%rdi), %xmm1

	pmovmskb	%xmm1, %eax

	test	%eax, %eax

	jnz	L(matches32_1)

	xor	%eax, %eax

	ret

	.p2align 4

L(matches0):

	bsr	%eax, %eax

	add	%rdi, %rax

	ret

	.p2align 4

L(matches16):

	bsr	%eax, %eax

	lea	16(%rax, %rdi), %rax

	ret

	.p2align 4

L(matches32):

	bsr	%eax, %eax

	lea	32(%rax, %rdi), %rax

	ret

	.p2align 4

L(matches48):

	bsr	%eax, %eax

	lea	48(%rax, %rdi), %rax

	ret

	.p2align 4

L(matches0_1):

	bsr	%eax, %eax

	sub	$64, %rdx

	add	%rax, %rdx

	jl	L(return_null)

	add	%rdi, %rax

	ret

	.p2align 4

L(matches16_1):

	bsr	%eax, %eax

	sub	$48, %rdx

	add	%rax, %rdx

	jl	L(return_null)

	lea	16(%rdi, %rax), %rax

	ret

	.p2align 4

L(matches32_1):

	bsr	%eax, %eax

	sub	$32, %rdx

	add	%rax, %rdx

	jl	L(return_null)

	lea	32(%rdi, %rax), %rax

	ret

	.p2align 4

L(matches48_1):

	bsr	%eax, %eax

	sub	$16, %rdx

	add	%rax, %rdx

	jl	L(return_null)

	lea	48(%rdi, %rax), %rax

	ret

	.p2align 4

L(return_null):

	xor	%eax, %eax

	ret

	.p2align 4

L(length_less16_offset0):

	test	%edx, %edx

	jz	L(return_null)

	mov	%dl, %cl

	pcmpeqb	(%rdi), %xmm1

	mov	$1, %edx

	sal	%cl, %edx

	sub	$1, %edx

	pmovmskb	%xmm1, %eax

	and	%edx, %eax

	test	%eax, %eax

	jz	L(return_null)

	bsr	%eax, %eax

	add	%rdi, %rax

	ret

	.p2align 4

L(length_less16):

	punpcklbw	%xmm1, %xmm1

	punpcklbw	%xmm1, %xmm1

	add	$16, %edx

	pshufd	$0, %xmm1, %xmm1

	mov	%edi, %ecx

	and	$15, %ecx

	jz	L(length_less16_offset0)

	mov	%cl, %dh

	mov	%ecx, %esi

	add	%dl, %dh

	and	$-16, %rdi

	sub	$16, %dh

	ja	L(length_less16_part2)

	pcmpeqb	(%rdi), %xmm1

	pmovmskb	%xmm1, %eax

	sar	%cl, %eax

	mov	%dl, %cl

	mov	$1, %edx

	sal	%cl, %edx

	sub	$1, %edx

	and	%edx, %eax

	test	%eax, %eax

	jz	L(return_null)

	bsr	%eax, %eax

	add	%rdi, %rax

	add	%rsi, %rax

	ret

	.p2align 4

L(length_less16_part2):

	movdqa	16(%rdi), %xmm2

	pcmpeqb	%xmm1, %xmm2

	pmovmskb	%xmm2, %eax

	mov	%dh, %cl

	mov	$1, %edx

	sal	%cl, %edx

	sub	$1, %edx

	and	%edx, %eax

	test	%eax, %eax

	jnz	L(length_less16_part2_return)

	pcmpeqb	(%rdi), %xmm1

	pmovmskb	%xmm1, %eax

	mov	%esi, %ecx

	sar	%cl, %eax

	test	%eax, %eax

	jz	L(return_null)

	bsr	%eax, %eax

	add	%rdi, %rax

	add	%rsi, %rax

	ret

	.p2align 4

L(length_less16_part2_return):

	bsr	%eax, %eax

	lea	16(%rax, %rdi), %rax

	ret

END (__memrchr)

weak_alias (__memrchr, memrchr)