/* wcschr with SSE2, without using bsf instructions

   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/>.  */

#if IS_IN (libc)

# include <sysdep.h>

# define CFI_PUSH(REG)	\

	cfi_adjust_cfa_offset (4);	\

	cfi_rel_offset (REG, 0)

# define CFI_POP(REG)	\

	cfi_adjust_cfa_offset (-4);	\

	cfi_restore (REG)

# define PUSH(REG)	pushl REG; CFI_PUSH (REG)

# define POP(REG)	popl REG; CFI_POP (REG)

# define PARMS	4

# define STR1	PARMS

# define STR2	STR1+4

	atom_text_section

ENTRY (__wcschr_sse2)

	mov	STR1(%esp), %ecx

	movd	STR2(%esp), %xmm1

	mov	%ecx, %eax

	punpckldq %xmm1, %xmm1

	pxor	%xmm2, %xmm2

	punpckldq %xmm1, %xmm1

	and	$63, %eax

	cmp	$48, %eax

	ja	L(cross_cache)

	movdqu	(%ecx), %xmm0

	pcmpeqd	%xmm0, %xmm2

	pcmpeqd	%xmm1, %xmm0

	pmovmskb %xmm2, %edx

	pmovmskb %xmm0, %eax

	or	%eax, %edx

	jnz	L(matches)

	and	$-16, %ecx

	jmp	L(loop)

	.p2align 4

L(cross_cache):

	PUSH	(%edi)

	mov	%ecx, %edi

	mov	%eax, %ecx

	and	$-16, %edi

	and	$15, %ecx

	movdqa	(%edi), %xmm0

	pcmpeqd	%xmm0, %xmm2

	pcmpeqd	%xmm1, %xmm0

	pmovmskb %xmm2, %edx

	pmovmskb %xmm0, %eax

	sarl	%cl, %edx

	sarl	%cl, %eax

	test	%eax, %eax

	jz	L(unaligned_no_match)

	add	%edi, %ecx

	POP	(%edi)

	test	%edx, %edx

	jz	L(match_case1)

	test	%al, %al

	jz	L(match_higth_case2)

	test	$15, %al

	jnz	L(match_case2_4)

	test	$15, %dl

	jnz	L(return_null)

	lea	4(%ecx), %eax

	ret

	CFI_PUSH (%edi)

	.p2align 4

L(unaligned_no_match):

	mov	%edi, %ecx

	POP	(%edi)

	test	%edx, %edx

	jnz	L(return_null)

	pxor	%xmm2, %xmm2

/* Loop start on aligned string.  */

	.p2align 4

L(loop):

	add	$16, %ecx

	movdqa	(%ecx), %xmm0

	pcmpeqd	%xmm0, %xmm2

	pcmpeqd	%xmm1, %xmm0

	pmovmskb %xmm2, %edx

	pmovmskb %xmm0, %eax

	or	%eax, %edx

	jnz	L(matches)

	add	$16, %ecx

	movdqa	(%ecx), %xmm0

	pcmpeqd	%xmm0, %xmm2

	pcmpeqd	%xmm1, %xmm0

	pmovmskb %xmm2, %edx

	pmovmskb %xmm0, %eax

	or	%eax, %edx

	jnz	L(matches)

	add	$16, %ecx

	movdqa	(%ecx), %xmm0

	pcmpeqd	%xmm0, %xmm2

	pcmpeqd	%xmm1, %xmm0

	pmovmskb %xmm2, %edx

	pmovmskb %xmm0, %eax

	or	%eax, %edx

	jnz	L(matches)

	add	$16, %ecx

	movdqa	(%ecx), %xmm0

	pcmpeqd	%xmm0, %xmm2

	pcmpeqd	%xmm1, %xmm0

	pmovmskb %xmm2, %edx

	pmovmskb %xmm0, %eax

	or	%eax, %edx

	jz	L(loop)

	.p2align 4

L(matches):

	pmovmskb %xmm2, %edx

	test	%eax, %eax

	jz	L(return_null)

	test	%edx, %edx

	jz	L(match_case1)

	.p2align 4

L(match_case2):

	test	%al, %al

	jz	L(match_higth_case2)

	test	$15, %al

	jnz	L(match_case2_4)

	test	$15, %dl

	jnz	L(return_null)

	lea	4(%ecx), %eax

	ret

	.p2align 4

L(match_case2_4):

	mov	%ecx, %eax

	ret

	.p2align 4

L(match_higth_case2):

	test	%dl, %dl

	jnz	L(return_null)

	test	$15, %ah

	jnz	L(match_case2_12)

	test	$15, %dh

	jnz	L(return_null)

	lea	12(%ecx), %eax

	ret

	.p2align 4

L(match_case2_12):

	lea	8(%ecx), %eax

	ret

	.p2align 4

L(match_case1):

	test	%al, %al

	jz	L(match_higth_case1)

	test	$0x01, %al

	jnz	L(exit0)

	lea	4(%ecx), %eax

	ret

	.p2align 4

L(match_higth_case1):

	test	$0x01, %ah

	jnz	L(exit3)

	lea	12(%ecx), %eax

	ret

	.p2align 4

L(exit0):

	mov	%ecx, %eax

	ret

	.p2align 4

L(exit3):

	lea	8(%ecx), %eax

	ret

	.p2align 4

L(return_null):

	xor	%eax, %eax

	ret

END (__wcschr_sse2)

#endif