gcc/gmp/mpn/x86_64/addaddmul_1msb0.asm

dnl  AMD64 mpn_addaddmul_1msb0, R = Au + Bv, u,v < 2^63.

dnl  Copyright 2008 Free Software Foundation, Inc.

dnl  This file is part of the GNU MP Library.

dnl  The GNU MP Library is free software; you can redistribute it and/or modify
dnl  it under the terms of the GNU Lesser General Public License as published
dnl  by the Free Software Foundation; either version 3 of the License, or (at
dnl  your option) any later version.

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 Lesser General Public
dnl  License for more details.

dnl  You should have received a copy of the GNU Lesser General Public License
dnl  along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.

include(`../config.m4')

C	     cycles/limb
C K8:		 2.167
C P4:		12.0
C P6-15:	 4.0

C TODO
C  * Perhaps handle various n mod 3 sizes better.  The code now is too large.

C INPUT PARAMETERS
define(`rp',	`%rdi')
define(`ap',	`%rsi')
define(`bp_param', `%rdx')
define(`n',	`%rcx')
define(`u0',	`%r8')
define(`v0',	`%r9')


define(`bp', `%rbp')

ASM_START()
	TEXT
	ALIGN(16)
PROLOGUE(mpn_addaddmul_1msb0)
	push	%r12
	push	%rbp

	lea	(ap,n,8), ap
	lea	(bp_param,n,8), bp
	lea	(rp,n,8), rp
	neg	n

	mov	(ap,n,8), %rax
	mul	%r8
	mov	%rax, %r12
	mov	(bp,n,8), %rax
	mov	%rdx, %r10
	add	$3, n
	jns	L(end)

	ALIGN(16)
L(top):	mul	%r9
	add	%rax, %r12
	mov	-16(ap,n,8), %rax
	adc	%rdx, %r10
	mov	%r12, -24(rp,n,8)
	mul	%r8
	add	%rax, %r10
	mov	-16(bp,n,8), %rax
	mov	$0, %r11d
	adc	%rdx, %r11
	mul	%r9
	add	%rax, %r10
	mov	-8(ap,n,8), %rax
	adc	%rdx, %r11
	mov	%r10, -16(rp,n,8)
	mul	%r8
	add	%rax, %r11
	mov	-8(bp,n,8), %rax
	mov	$0, %r12d
	adc	%rdx, %r12
	mul	%r9
	add	%rax, %r11
	adc	%rdx, %r12
	mov	(ap,n,8), %rax
	mul	%r8
	add	%rax, %r12
	mov	%r11, -8(rp,n,8)
	mov	(bp,n,8), %rax
	mov	$0, %r10d
	adc	%rdx, %r10
	add	$3, n
	js	L(top)

L(end):	cmp	$1, R32(n)
	ja	2f
	jz	1f

	mul	%r9
	add	%rax, %r12
	mov	-16(ap), %rax
	adc	%rdx, %r10
	mov	%r12, -24(rp)
	mul	%r8
	add	%rax, %r10
	mov	-16(bp), %rax
	mov	$0, %r11d
	adc	%rdx, %r11
	mul	%r9
	add	%rax, %r10
	mov	-8(ap), %rax
	adc	%rdx, %r11
	mov	%r10, -16(rp)
	mul	%r8
	add	%rax, %r11
	mov	-8(bp), %rax
	mov	$0, %r12d
	adc	%rdx, %r12
	mul	%r9
	add	%rax, %r11
	adc	%rdx, %r12
	mov	%r11, -8(rp)
	mov	%r12, %rax
	pop	%rbp
	pop	%r12
	ret

1:	mul	%r9
	add	%rax, %r12
	mov	-8(ap), %rax
	adc	%rdx, %r10
	mov	%r12, -16(rp)
	mul	%r8
	add	%rax, %r10
	mov	-8(bp), %rax
	mov	$0, %r11d
	adc	%rdx, %r11
	mul	%r9
	add	%rax, %r10
	adc	%rdx, %r11
	mov	%r10, -8(rp)
	mov	%r11, %rax
	pop	%rbp
	pop	%r12
	ret

2:	mul	%r9
	add	%rax, %r12
	mov	%r12, -8(rp)
	adc	%rdx, %r10
	mov	%r10, %rax
	pop	%rbp
	pop	%r12
	ret
EPILOGUE()