/* i80386 __mpn_rshift --

   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+12		/* space for 3 saved regs */

#define RES	PARMS

#define S	RES+4

#define SIZE	S+4

#define CNT	SIZE+4

	.text

ENTRY (__mpn_rshift)

	pushl	%edi

	cfi_adjust_cfa_offset (4)

	pushl	%esi

	cfi_adjust_cfa_offset (4)

	pushl	%ebx

	cfi_adjust_cfa_offset (4)

	movl	RES(%esp),%edi

	cfi_rel_offset (edi, 8)

	movl	S(%esp),%esi

	cfi_rel_offset (esi, 4)

	movl	SIZE(%esp),%edx

	movl	CNT(%esp),%ecx

	leal	-4(%edi,%edx,4),%edi

	leal	(%esi,%edx,4),%esi

	negl	%edx

	movl	(%esi,%edx,4),%ebx	/* read least significant limb */

	cfi_rel_offset (ebx, 0)

	cfi_remember_state

	xorl	%eax,%eax

	shrdl	%cl,%ebx,%eax		/* compute carry limb */

	incl	%edx

	jz	L(end)

	pushl	%eax			/* push carry limb onto stack */

	cfi_adjust_cfa_offset (4)

	testb	$1,%dl

	jnz	L(1)			/* enter loop in the middle */

	movl	%ebx,%eax

	ALIGN (3)

L(oop):	movl	(%esi,%edx,4),%ebx	/* load next higher limb */

	shrdl	%cl,%ebx,%eax		/* compute result limb */

	movl	%eax,(%edi,%edx,4)	/* store it */

	incl	%edx

L(1):	movl	(%esi,%edx,4),%eax

	shrdl	%cl,%eax,%ebx

	movl	%ebx,(%edi,%edx,4)

	incl	%edx

	jnz	L(oop)

	shrl	%cl,%eax		/* compute most significant limb */

	movl	%eax,(%edi)		/* store it */

	popl	%eax			/* pop carry limb */

	cfi_adjust_cfa_offset (-4)

	popl	%ebx

	cfi_adjust_cfa_offset (-4)

	cfi_restore (ebx)

	popl	%esi

	cfi_adjust_cfa_offset (-4)

	cfi_restore (esi)

	popl	%edi

	cfi_adjust_cfa_offset (-4)

	cfi_restore (edi)

	ret

	cfi_restore_state

L(end):	shrl	%cl,%ebx		/* compute most significant limb */

	movl	%ebx,(%edi)		/* store it */

	popl	%ebx

	cfi_adjust_cfa_offset (-4)

	cfi_restore (ebx)

	popl	%esi

	cfi_adjust_cfa_offset (-4)

	cfi_restore (esi)

	popl	%edi

	cfi_adjust_cfa_offset (-4)

	cfi_restore (edi)

	ret

END (__mpn_rshift)