dnl  ARM64 mpn_add_n and mpn_sub_n

dnl  Contributed to the GNU project by Torbjörn Granlund.

dnl  Copyright 2013 Free Software Foundation, Inc.

dnl  This file is part of the GNU MP Library.

dnl

dnl  The GNU MP Library is free software; you can redistribute it and/or modify

dnl  it under the terms of either:

dnl

dnl    * the GNU Lesser General Public License as published by the Free

dnl      Software Foundation; either version 3 of the License, or (at your

dnl      option) any later version.

dnl

dnl  or

dnl

dnl    * the GNU General Public License as published by the Free Software

dnl      Foundation; either version 2 of the License, or (at your option) any

dnl      later version.

dnl

dnl  or both in parallel, as here.

dnl

dnl  The GNU MP Library is distributed in the hope that it will be useful, but

dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

dnl  for more details.

dnl

dnl  You should have received copies of the GNU General Public License and the

dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,

dnl  see https://www.gnu.org/licenses/.

include(`../config.m4')

C	     cycles/limb

C Cortex-A53	 ?

C Cortex-A57	 ?

changecom(@&*$)

define(`rp', `x0')

define(`up', `x1')

define(`vp', `x2')

define(`n',  `x3')

ifdef(`OPERATION_add_n', `

  define(`ADDSUBC',	adcs)

  define(`CLRCY',	`cmn	xzr, xzr')

  define(`SETCY',	`cmp	$1, #1')

  define(`RETVAL',	`adc	x0, xzr, xzr')

  define(`func',	mpn_add_n)

  define(`func_nc',	mpn_add_nc)')

ifdef(`OPERATION_sub_n', `

  define(`ADDSUBC',	sbcs)

  define(`CLRCY',	`cmp	xzr, xzr')

  define(`SETCY',	`subs	$1, xzr, $1')

  define(`RETVAL',	`sbc	x0, xzr, xzr

			and	x0, x0, #1')

  define(`func',	mpn_sub_n)

  define(`func_nc',	mpn_sub_nc)')

MULFUNC_PROLOGUE(mpn_add_n mpn_add_nc mpn_sub_n mpn_sub_nc)

ASM_START()

PROLOGUE(func_nc)

	SETCY(	x4)

	b	L(ent)

EPILOGUE()

PROLOGUE(func)

	CLRCY

L(ent):	tbz	n, #0, L(b0)

	ldr	x4, [up],#8

	ldr	x6, [vp],#8

	sub	n, n, #1

	ADDSUBC	x8, x4, x6

	str	x8, [rp],#8

	cbz	n, L(rt)

L(b0):	ldp	x4, x5, [up],#16

	ldp	x6, x7, [vp],#16

	sub	n, n, #2

	ADDSUBC	x8, x4, x6

	ADDSUBC	x9, x5, x7

	cbz	n, L(end)

L(top):	ldp	x4, x5, [up],#16

	ldp	x6, x7, [vp],#16

	sub	n, n, #2

	stp	x8, x9, [rp],#16

	ADDSUBC	x8, x4, x6

	ADDSUBC	x9, x5, x7

	cbnz	n, L(top)

L(end):	stp	x8, x9, [rp]

L(rt):	RETVAL

	ret

EPILOGUE()