/* wcsrchr with SSSE3

   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 (wcsrchr)

	movd	%rsi, %xmm1

	mov	%rdi, %rcx

	punpckldq %xmm1, %xmm1

	pxor	%xmm2, %xmm2

	punpckldq %xmm1, %xmm1

	and	$63, %rcx

	cmp	$48, %rcx

	ja	L(crosscache)

	movdqu	(%rdi), %xmm0

	pcmpeqd	%xmm0, %xmm2

	pcmpeqd	%xmm1, %xmm0

	pmovmskb %xmm2, %rcx

	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):

	and	$15, %rcx

	and	$-16, %rdi

	pxor	%xmm3, %xmm3

	movdqa	(%rdi), %xmm0

	pcmpeqd	%xmm0, %xmm3

	pcmpeqd	%xmm1, %xmm0

	pmovmskb %xmm3, %rdx

	pmovmskb %xmm0, %rax

	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

	pcmpeqd	%xmm0, %xmm2

	add	$16, %rdi

	pcmpeqd	%xmm1, %xmm0

	pmovmskb %xmm2, %rcx

	pmovmskb %xmm0, %rax

	or	%rax, %rcx

	jnz	L(matches)

	movdqa	(%rdi), %xmm3

	pcmpeqd	%xmm3, %xmm2

	add	$16, %rdi

	pcmpeqd	%xmm1, %xmm3

	pmovmskb %xmm2, %rcx

	pmovmskb %xmm3, %rax

	or	%rax, %rcx

	jnz	L(matches)

	movdqa	(%rdi), %xmm4

	pcmpeqd	%xmm4, %xmm2

	add	$16, %rdi

	pcmpeqd	%xmm1, %xmm4

	pmovmskb %xmm2, %rcx

	pmovmskb %xmm4, %rax

	or	%rax, %rcx

	jnz	L(matches)

	movdqa	(%rdi), %xmm5

	pcmpeqd	%xmm5, %xmm2

	add	$16, %rdi

	pcmpeqd	%xmm1, %xmm5

	pmovmskb %xmm2, %rcx

	pmovmskb %xmm5, %rax

	or	%rax, %rcx

	jz	L(loop)

	.p2align 4

L(matches):

	test	%rax, %rax

	jnz	L(match)

L(return_value):

	test	%r8, %r8

	jz	L(return_null)

	mov	%r8, %rax

	mov	%rsi, %rdi

	test	$15 << 4, %ah

	jnz	L(match_fourth_wchar)

	test	%ah, %ah

	jnz	L(match_third_wchar)

	test	$15 << 4, %al

	jnz	L(match_second_wchar)

	lea	-16(%rdi), %rax

	ret

	.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	$15, %cl

	jnz	L(find_zero_in_first_wchar)

	test	%cl, %cl

	jnz	L(find_zero_in_second_wchar)

	test	$15, %ch

	jnz	L(find_zero_in_third_wchar)

	and	$1 << 13 - 1, %rax

	jz	L(return_value)

	test	$15 << 4, %ah

	jnz	L(match_fourth_wchar)

	test	%ah, %ah

	jnz	L(match_third_wchar)

	test	$15 << 4, %al

	jnz	L(match_second_wchar)

	lea	-16(%rdi), %rax

	ret

	.p2align 4

L(find_zero_in_first_wchar):

	test	$1, %rax

	jz	L(return_value)

	lea	-16(%rdi), %rax

	ret

	.p2align 4

L(find_zero_in_second_wchar):

	and	$1 << 5 - 1, %rax

	jz	L(return_value)

	test	$15 << 4, %al

	jnz	L(match_second_wchar)

	lea	-16(%rdi), %rax

	ret

	.p2align 4

L(find_zero_in_third_wchar):

	and	$1 << 9 - 1, %rax

	jz	L(return_value)

	test	%ah, %ah

	jnz	L(match_third_wchar)

	test	$15 << 4, %al

	jnz	L(match_second_wchar)

	lea	-16(%rdi), %rax

	ret

	.p2align 4

L(prolog_find_zero):

	add	%rcx, %rdi

	mov     %rdx, %rcx

L(prolog_find_zero_1):

	test	$15, %cl

	jnz	L(prolog_find_zero_in_first_wchar)

	test	%cl, %cl

	jnz	L(prolog_find_zero_in_second_wchar)

	test	$15, %ch

	jnz	L(prolog_find_zero_in_third_wchar)

	and	$1 << 13 - 1, %rax

	jz	L(return_null)

	test	$15 << 4, %ah

	jnz	L(match_fourth_wchar)

	test	%ah, %ah

	jnz	L(match_third_wchar)

	test	$15 << 4, %al

	jnz	L(match_second_wchar)

	lea	-16(%rdi), %rax

	ret

	.p2align 4

L(prolog_find_zero_in_first_wchar):

	test	$1, %rax

	jz	L(return_null)

	lea	-16(%rdi), %rax

	ret

	.p2align 4

L(prolog_find_zero_in_second_wchar):

	and	$1 << 5 - 1, %rax

	jz	L(return_null)

	test	$15 << 4, %al

	jnz	L(match_second_wchar)

	lea	-16(%rdi), %rax

	ret

	.p2align 4

L(prolog_find_zero_in_third_wchar):

	and	$1 << 9 - 1, %rax

	jz	L(return_null)

	test	%ah, %ah

	jnz	L(match_third_wchar)

	test	$15 << 4, %al

	jnz	L(match_second_wchar)

	lea	-16(%rdi), %rax

	ret

	.p2align 4

L(match_second_wchar):

	lea	-12(%rdi), %rax

	ret

	.p2align 4

L(match_third_wchar):

	lea	-8(%rdi), %rax

	ret

	.p2align 4

L(match_fourth_wchar):

	lea	-4(%rdi), %rax

	ret

	.p2align 4

L(return_null):

	xor	%rax, %rax

	ret

END (wcsrchr)