dnl  AMD64 mpn_mul_1 optimised for Intel Atom.

dnl  Copyright 2003-2005, 2007, 2008, 2012, 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	best

C AMD K8,K9

C AMD K10

C AMD bd1

C AMD bd2

C AMD bobcat

C AMD jaguar

C Intel P4

C Intel PNR

C Intel NHM

C Intel SBR

C Intel IBR

C Intel HWL

C Intel BWL

C Intel atom	17.3		this

C VIA nano

C The loop of this code is the result of running a code generation and

C optimisation tool suite written by David Harvey and Torbjorn Granlund.

define(`rp',      `%rdi')   C rcx

define(`up',      `%rsi')   C rdx

define(`n_param', `%rdx')   C r8

define(`v0',      `%rcx')   C r9

define(`n',       `%r11')

ABI_SUPPORT(DOS64)

ABI_SUPPORT(STD64)

ASM_START()

	TEXT

	ALIGN(16)

PROLOGUE(mpn_mul_1)

	FUNC_ENTRY(4)

	xor	%r8, %r8

L(com):	mov	(up), %rax

	lea	-16(up,n_param,8), up

	lea	-8(rp,n_param,8), rp

	test	$1, R8(n_param)

	jnz	L(bx1)

L(bx0):	mov	%r8, %r9

	test	$2, R8(n_param)

	jnz	L(b10)

L(b00):	mov	$2, R32(n)

	sub	n_param, n

	jmp	L(lo0)

L(bx1):	test	$2, R8(n_param)

	jnz	L(b11)

L(b01):	mov	$3, R32(n)

	sub	n_param, n

	mul	v0

	cmp	$2, n

	jnz	L(lo1)

	jmp	L(cj1)

L(b11):	mov	$1, R32(n)

	sub	n_param, n

	jmp	L(lo3)

L(b10):	xor	R32(n), R32(n)

	sub	n_param, n

	jmp	L(lo2)

L(top):	mul	v0

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

L(lo1):	xor	%r9d, %r9d

	add	%rax, %r8

	mov	(up,n,8), %rax

	adc	%rdx, %r9

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

L(lo0):	xor	%r8d, %r8d

	mul	v0

	add	%rax, %r9

	mov	8(up,n,8), %rax

	adc	%rdx, %r8

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

L(lo3):	xor	%r9d, %r9d

	mul	v0

	add	%rax, %r8

	mov	16(up,n,8), %rax

	adc	%rdx, %r9

	mov	%r8, (rp,n,8)

L(lo2):	xor	%r8d, %r8d

	mul	v0

	add	%rax, %r9

	mov	24(up,n,8), %rax

	adc	%rdx, %r8

	add	$4, n

	js	L(top)

L(end):	mul	v0

	mov	%r9, -8(rp)

L(cj1):	add	%rax, %r8

	mov	$0, R32(%rax)

	adc	%rdx, %rax

	mov	%r8, (rp)

	FUNC_EXIT()

	ret

EPILOGUE()

PROLOGUE(mpn_mul_1c)

	FUNC_ENTRY(4)

IFDOS(`	mov	56(%rsp), %r8	')

	jmp	L(com)

EPILOGUE()

ASM_END()