/* strrchr with SSE2 with bsf and bsr

   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

	.text

ENTRY (__strrchr_sse2_bsf)

	mov	STR1(%esp), %ecx

	movd	STR2(%esp), %xmm1

	PUSH	(%edi)

	pxor	%xmm2, %xmm2

	mov	%ecx, %edi

	punpcklbw %xmm1, %xmm1

	punpcklbw %xmm1, %xmm1

	/* ECX has OFFSET. */

	and	$63, %ecx

	cmp	$48, %ecx

	pshufd	$0, %xmm1, %xmm1

	ja	L(crosscashe)

/* unaligned string. */

	movdqu	(%edi), %xmm0

	pcmpeqb	%xmm0, %xmm2

	pcmpeqb	%xmm1, %xmm0

	/* Find where NULL is.  */

	pmovmskb %xmm2, %edx

	/* Check if there is a match.  */

	pmovmskb %xmm0, %eax

	test	%eax, %eax

	jnz	L(unaligned_match1)

	test	%edx, %edx

	jnz	L(return_null)

	and	$-16, %edi

	add	$16, %edi

	PUSH	(%esi)

	PUSH	(%ebx)

	xor	%ebx, %ebx

	jmp	L(loop)

	CFI_POP	(%esi)

	CFI_POP	(%ebx)

	.p2align 4

L(unaligned_return_value1):

	bsf	%edx, %ecx

	mov	$2, %edx

	shl	%cl, %edx

	sub	$1, %edx

	and	%edx, %eax

	jz	L(return_null)

	bsr	%eax, %eax

	add	%edi, %eax

	POP	(%edi)

	ret

	CFI_PUSH	(%edi)

	.p2align 4

L(unaligned_match1):

	test	%edx, %edx

	jnz	L(unaligned_return_value1)

	PUSH	(%esi)

	PUSH	(%ebx)

	mov	%eax, %ebx

	lea	16(%edi), %esi

	and	$-16, %edi

	add	$16, %edi

	jmp	L(loop)

	CFI_POP	(%esi)

	CFI_POP	(%ebx)

	.p2align 4

	L(crosscashe):

/* Hancle unaligned string.  */

	and	$15, %ecx

	and	$-16, %edi

	pxor	%xmm3, %xmm3

	movdqa	(%edi), %xmm0

	pcmpeqb	%xmm0, %xmm3

	pcmpeqb	%xmm1, %xmm0

	/* Find where NULL is.  */

	pmovmskb %xmm3, %edx

	/* Check if there is a match.  */

	pmovmskb %xmm0, %eax

	/* Remove the leading bytes.  */

	shr	%cl, %edx

	shr	%cl, %eax

	test	%eax, %eax

	jnz	L(unaligned_match)

	test	%edx, %edx

	jnz	L(return_null)

	add	$16, %edi

	PUSH	(%esi)

	PUSH	(%ebx)

	xor	%ebx, %ebx

	jmp	L(loop)

	CFI_POP	(%esi)

	CFI_POP	(%ebx)

	.p2align 4

L(unaligned_return_value):

	add	%ecx, %edi

	bsf	%edx, %ecx

	mov	$2, %edx

	shl	%cl, %edx

	sub	$1, %edx

	and	%edx, %eax

	jz	L(return_null)

	bsr	%eax, %eax

	add	%edi, %eax

	POP	(%edi)

	ret

	CFI_PUSH	(%edi)

	.p2align 4

L(unaligned_match):

	test	%edx, %edx

	jnz	L(unaligned_return_value)

	PUSH	(%esi)

	PUSH	(%ebx)

	mov	%eax, %ebx

	add	$16, %edi

	lea	(%edi, %ecx), %esi

/* Loop start on aligned string.  */

	.p2align 4

L(loop):

	movdqa	(%edi), %xmm0

	pcmpeqb	%xmm0, %xmm2

	add	$16, %edi

	pcmpeqb	%xmm1, %xmm0

	pmovmskb %xmm2, %ecx

	pmovmskb %xmm0, %eax

	or	%eax, %ecx

	jnz	L(matches)

	movdqa	(%edi), %xmm0

	pcmpeqb	%xmm0, %xmm2

	add	$16, %edi

	pcmpeqb	%xmm1, %xmm0

	pmovmskb %xmm2, %ecx

	pmovmskb %xmm0, %eax

	or	%eax, %ecx

	jnz	L(matches)

	movdqa	(%edi), %xmm0

	pcmpeqb	%xmm0, %xmm2

	add	$16, %edi

	pcmpeqb	%xmm1, %xmm0

	pmovmskb %xmm2, %ecx

	pmovmskb %xmm0, %eax

	or	%eax, %ecx

	jnz	L(matches)

	movdqa	(%edi), %xmm0

	pcmpeqb	%xmm0, %xmm2

	add	$16, %edi

	pcmpeqb	%xmm1, %xmm0

	pmovmskb %xmm2, %ecx

	pmovmskb %xmm0, %eax

	or	%eax, %ecx

	jz	L(loop)

L(matches):

	test	%eax, %eax

	jnz	L(match)

L(return_value):

	test	%ebx, %ebx

	jz	L(return_null_1)

	bsr	%ebx, %eax

	add	%esi, %eax

	POP	(%ebx)

	POP	(%esi)

	sub	$16, %eax

	POP	(%edi)

	ret

	CFI_PUSH	(%edi)

	CFI_PUSH	(%ebx)

	CFI_PUSH	(%esi)

	.p2align 4

L(match):

	pmovmskb %xmm2, %ecx

	test	%ecx, %ecx

	jnz	L(return_value_1)

	mov	%eax, %ebx

	mov	%edi, %esi

	jmp	L(loop)

	.p2align 4

L(return_value_1):

	bsf	%ecx, %ecx

	mov	$2, %edx

	shl	%cl, %edx

	sub	$1, %edx

	and	%edx, %eax

	jz	L(return_value)

	POP	(%ebx)

	POP	(%esi)

	bsr	%eax, %eax

	add	%edi, %eax

	sub	$16, %eax

	POP	(%edi)

	ret

	CFI_PUSH	(%edi)

/* Return NULL.  */

	.p2align 4

L(return_null):

	xor	%eax, %eax

	POP	(%edi)

	ret

	CFI_PUSH	(%edi)

	CFI_PUSH	(%ebx)

	CFI_PUSH	(%esi)

/* Return NULL.  */

	.p2align 4

L(return_null_1):

	POP	(%ebx)

	POP	(%esi)

	POP	(%edi)

	xor	%eax, %eax

	ret

END (__strrchr_sse2_bsf)

#endif