dnl  X86 mpn_cnd_add_n, mpn_cnd_sub_n

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 P5				 ?

C P6 model 0-8,10-12		 ?

C P6 model 9   (Banias)		 ?

C P6 model 13  (Dothan)		 5.4

C P4 model 0-1 (Willamette)	 ?

C P4 model 2   (Northwood)	14.5

C P4 model 3-4 (Prescott)	21

C Intel atom			11

C AMD K6			 ?

C AMD K7			 3.4

C AMD K8			 ?

define(`rp',  `%edi')

define(`up',  `%esi')

define(`vp',  `%ebp')

define(`n',   `%ecx')

define(`cnd', `20(%esp)')

define(`cy',  `%edx')

ifdef(`OPERATION_cnd_add_n', `

	define(ADDSUB,	      add)

	define(ADCSBB,	      adc)

	define(func,	      mpn_cnd_add_n)')

ifdef(`OPERATION_cnd_sub_n', `

	define(ADDSUB,	      sub)

	define(ADCSBB,	      sbb)

	define(func,	      mpn_cnd_sub_n)')

MULFUNC_PROLOGUE(mpn_cnd_add_n mpn_cnd_sub_n)

ASM_START()

	TEXT

	ALIGN(16)

PROLOGUE(func)

	add	$-16, %esp

	mov	%ebp, (%esp)

	mov	%ebx, 4(%esp)

	mov	%esi, 8(%esp)

	mov	%edi, 12(%esp)

	C make cnd into a full mask

	mov	cnd, %eax

	neg	%eax

	sbb	%eax, %eax

	mov	%eax, cnd

	C load parameters into registers

	mov	24(%esp), rp

	mov	28(%esp), up

	mov	32(%esp), vp

	mov	36(%esp), n

	mov	(vp), %eax

	mov	(up), %ebx

	C put operand pointers just beyond their last limb

	lea	(vp,n,4), vp

	lea	(up,n,4), up

	lea	-4(rp,n,4), rp

	neg	n

	and	cnd, %eax

	ADDSUB	%eax, %ebx

	sbb	cy, cy

	inc	n

	je	L(end)

	ALIGN(16)

L(top):	mov	(vp,n,4), %eax

	and	cnd, %eax

	mov	%ebx, (rp,n,4)

	mov	(up,n,4), %ebx

	add	cy, cy

	ADCSBB	%eax, %ebx

	sbb	cy, cy

	inc	n

	jne	L(top)

L(end):	mov	%ebx, (rp)

	xor	%eax, %eax

	sub	cy, %eax

	mov	(%esp), %ebp

	mov	4(%esp), %ebx

	mov	8(%esp), %esi

	mov	12(%esp), %edi

	add	$16, %esp

	ret

EPILOGUE()

ASM_END()