/* x86-64 __mpn_add_n -- Add two limb vectors of the same length > 0 and store

   sum in a third limb vector.

   Copyright (C) 2006-2018 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 rp	%rdi

#define up	%rsi

#define vp	%rdx

#define n	%rcx

#define cy	%r8

#ifndef func

# define func __mpn_add_n

# define ADCSBB adc

#endif

	.text

ENTRY (func)

	xor	%r8, %r8

	mov	(up), %r10

	mov	(vp), %r11

	lea	-8(up,n,8), up

	lea	-8(vp,n,8), vp

	lea	-16(rp,n,8), rp

	mov	%ecx, %eax

	neg	n

	and	$3, %eax

	je	L(b00)

	add	%rax, n		/* clear low rcx bits for jrcxz */

	cmp	$2, %eax

	jl	L(b01)

	je	L(b10)

L(b11):	shr	%r8		/* set cy */

	jmp	L(e11)

L(b00):	shr	%r8		/* set cy */

	mov	%r10, %r8

	mov	%r11, %r9

	lea	4(n), n

	jmp	L(e00)

L(b01):	shr	%r8		/* set cy */

	jmp	L(e01)

L(b10):	shr	%r8		/* set cy */

	mov	%r10, %r8

	mov	%r11, %r9

	jmp	L(e10)

L(end):	ADCSBB	%r11, %r10

	mov	%r10, 8(rp)

	mov	%ecx, %eax	/* clear eax, ecx contains 0 */

	adc	%eax, %eax

	ret

	.p2align 4

L(top):

	mov	-24(up,n,8), %r8

	mov	-24(vp,n,8), %r9

	ADCSBB	%r11, %r10

	mov	%r10, -24(rp,n,8)

L(e00):

	mov	-16(up,n,8), %r10

	mov	-16(vp,n,8), %r11

	ADCSBB	%r9, %r8

	mov	%r8, -16(rp,n,8)

L(e11):

	mov	-8(up,n,8), %r8

	mov	-8(vp,n,8), %r9

	ADCSBB	%r11, %r10

	mov	%r10, -8(rp,n,8)

L(e10):

	mov	(up,n,8), %r10

	mov	(vp,n,8), %r11

	ADCSBB	%r9, %r8

	mov	%r8, (rp,n,8)

L(e01):

	jrcxz	L(end)

	lea	4(n), n

	jmp	L(top)

END (func)