dnl  AMD64 mpn_add_err2_n, mpn_sub_err2_n

dnl  Contributed by David Harvey.

dnl  Copyright 2011 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 AMD K8,K9	 4.5

C AMD K10	 ?

C Intel P4	 ?

C Intel core2	 6.9

C Intel corei	 ?

C Intel atom	 ?

C VIA nano	 ?

C INPUT PARAMETERS

define(`rp',	`%rdi')

define(`up',	`%rsi')

define(`vp',	`%rdx')

define(`ep',	`%rcx')

define(`yp1',	`%r8')

define(`yp2',   `%r9')

define(`n_param',     `8(%rsp)')

define(`cy_param',    `16(%rsp)')

define(`cy1',   `%r14')

define(`cy2',   `%rax')

define(`n',     `%r10')

define(`w',     `%rbx')

define(`e1l',	`%rbp')

define(`e1h',	`%r11')

define(`e2l',	`%r12')

define(`e2h',	`%r13')

ifdef(`OPERATION_add_err2_n', `

	define(ADCSBB,	      adc)

	define(func,	      mpn_add_err2_n)')

ifdef(`OPERATION_sub_err2_n', `

	define(ADCSBB,	      sbb)

	define(func,	      mpn_sub_err2_n)')

MULFUNC_PROLOGUE(mpn_add_err2_n mpn_sub_err2_n)

ASM_START()

	TEXT

	ALIGN(16)

PROLOGUE(func)

	mov	cy_param, cy2

	mov	n_param, n

	push	%rbx

	push	%rbp

	push	%r12

	push	%r13

	push	%r14

	xor	R32(e1l), R32(e1l)

	xor	R32(e1h), R32(e1h)

	xor	R32(e2l), R32(e2l)

	xor	R32(e2h), R32(e2h)

	sub	yp1, yp2

	lea	(rp,n,8), rp

	lea	(up,n,8), up

	lea	(vp,n,8), vp

	test	$1, n

	jnz	L(odd)

	lea	-8(yp1,n,8), yp1

	neg	n

	jmp	L(top)

	ALIGN(16)

L(odd):

	lea	-16(yp1,n,8), yp1

	neg	n

	shr	$1, cy2

	mov	(up,n,8), w

	ADCSBB	(vp,n,8), w

	cmovc	8(yp1), e1l

	cmovc	8(yp1,yp2), e2l

	mov	w, (rp,n,8)

	sbb	cy2, cy2

	inc	n

	jz	L(end)

	ALIGN(16)

L(top):

	mov	(up,n,8), w

	shr	$1, cy2		C restore carry

	ADCSBB	(vp,n,8), w

	mov	w, (rp,n,8)

	sbb	cy1, cy1	C generate mask, preserve CF

	mov	8(up,n,8), w

	ADCSBB	8(vp,n,8), w

	mov	w, 8(rp,n,8)

	sbb	cy2, cy2	C generate mask, preserve CF

	mov	(yp1), w	C (e1h:e1l) += cy1 * yp1 limb

	and	cy1, w

	add	w, e1l

	adc	$0, e1h

	and	(yp1,yp2), cy1	C (e2h:e2l) += cy1 * yp2 limb

	add	cy1, e2l

	adc	$0, e2h

	mov	-8(yp1), w	C (e1h:e1l) += cy2 * next yp1 limb

	and	cy2, w

	add	w, e1l

	adc	$0, e1h

	mov	-8(yp1,yp2), w	C (e2h:e2l) += cy2 * next yp2 limb

	and	cy2, w

	add	w, e2l

	adc	$0, e2h

	add	$2, n

	lea	-16(yp1), yp1

	jnz	L(top)

L(end):

	mov	e1l, (ep)

	mov	e1h, 8(ep)

	mov	e2l, 16(ep)

	mov	e2h, 24(ep)

	and	$1, %eax	C return carry

	pop	%r14

	pop	%r13

	pop	%r12

	pop	%rbp

	pop	%rbx

	ret

EPILOGUE()

CF_PROT