/* i80386 __mpn_sub_n -- Add two limb vectors of the same length > 0 and store

   sum in a third limb vector.

   Copyright (C) 1992-2018 Free Software Foundation, Inc.

   This file is part of the GNU MP Library.

   The GNU MP 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 MP 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 MP Library; see the file COPYING.LIB.  If not,

   see <http://www.gnu.org/licenses/>.  */

#include <sysdep.h>

#include "asm-syntax.h"

#define PARMS	4+8		/* space for 2 saved regs */

#define RES	PARMS

#define S1	RES+4

#define S2	S1+4

#define SIZE	S2+4

	.text

ENTRY (__mpn_sub_n)

	pushl %edi

	cfi_adjust_cfa_offset (4)

	pushl %esi

	cfi_adjust_cfa_offset (4)

	movl	RES(%esp),%edi

	cfi_rel_offset (edi, 4)

	movl	S1(%esp),%esi

	cfi_rel_offset (esi, 0)

	movl	S2(%esp),%edx

	movl	SIZE(%esp),%ecx

#if IBT_ENABLED

	pushl	%ebx

	cfi_adjust_cfa_offset (4)

	cfi_rel_offset (ebx, 0)

#endif

	movl	%ecx,%eax

	shrl	$3,%ecx			/* compute count for unrolled loop */

	negl	%eax

	andl	$7,%eax			/* get index where to start loop */

	jz	L(oop)			/* necessary special case for 0 */

	incl	%ecx			/* adjust loop count */

	shll	$2,%eax			/* adjustment for pointers... */

	subl	%eax,%edi		/* ... since they are offset ... */

	subl	%eax,%esi		/* ... by a constant when we ... */

	subl	%eax,%edx		/* ... enter the loop */

	shrl	$2,%eax			/* restore previous value */

#if defined __CET__ && (__CET__ & 1) != 0

	leal	-4(,%eax,4),%ebx	/* Count for 4-byte endbr32 */

#endif

#ifdef PIC

/* Calculate start address in loop for PIC.  Due to limitations in some

   assemblers, Loop-L0-3 cannot be put into the leal */

	call	L(0)

	cfi_adjust_cfa_offset (4)

L(0):	leal	(%eax,%eax,8),%eax

	addl	(%esp),%eax

	addl	$(L(oop)-L(0)-3),%eax

	addl	$4,%esp

	cfi_adjust_cfa_offset (-4)

#else

/* Calculate start address in loop for non-PIC.  */

 	leal	(L(oop) - 3)(%eax,%eax,8),%eax

#endif

#if defined __CET__ && (__CET__ & 1) != 0

	addl	%ebx,%eax		/* Adjust for endbr32 */

#endif

	jmp	*%eax			/* jump into loop */

	ALIGN (3)

L(oop):	movl	(%esi),%eax

	sbbl	(%edx),%eax

	movl	%eax,(%edi)

	_CET_ENDBR

	movl	4(%esi),%eax

	sbbl	4(%edx),%eax

	movl	%eax,4(%edi)

	_CET_ENDBR

	movl	8(%esi),%eax

	sbbl	8(%edx),%eax

	movl	%eax,8(%edi)

	_CET_ENDBR

	movl	12(%esi),%eax

	sbbl	12(%edx),%eax

	movl	%eax,12(%edi)

	_CET_ENDBR

	movl	16(%esi),%eax

	sbbl	16(%edx),%eax

	movl	%eax,16(%edi)

	_CET_ENDBR

	movl	20(%esi),%eax

	sbbl	20(%edx),%eax

	movl	%eax,20(%edi)

	_CET_ENDBR

	movl	24(%esi),%eax

	sbbl	24(%edx),%eax

	movl	%eax,24(%edi)

	_CET_ENDBR

	movl	28(%esi),%eax

	sbbl	28(%edx),%eax

	movl	%eax,28(%edi)

	leal	32(%edi),%edi

	leal	32(%esi),%esi

	leal	32(%edx),%edx

	decl	%ecx

	jnz	L(oop)

	sbbl	%eax,%eax

	negl	%eax

#if defined __CET__ && (__CET__ & 1) != 0

	popl	%ebx

	cfi_adjust_cfa_offset (-4)

	cfi_restore (ebx)

#endif

	popl %esi

	cfi_adjust_cfa_offset (-4)

	cfi_restore (esi)

	popl %edi

	cfi_adjust_cfa_offset (-4)

	cfi_restore (edi)

	ret

END (__mpn_sub_n)