dnl  X86-64 mpn_mul_1 optimised for Intel Sandy Bridge.

dnl  Contributed to the GNU project by Torbjörn Granlund.

dnl  Copyright 2003-2005, 2007, 2008, 2011-2013 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 AMD K8,K9

C AMD K10

C AMD bd1

C AMD bobcat

C Intel P4

C Intel core2

C Intel NHM

C Intel SBR	 2.5

C Intel IBR	 2.4

C Intel atom

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.

C TODO

C  * The loop is great, but the prologue code was quickly written.  Tune it!

C  * Add mul_1c entry point.

C  * We could preserve one less register under DOS64 calling conventions, using

C    r10 instead of rsi.

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)

IFDOS(`	define(`up',     ``%rsi'')') dnl

IFDOS(`	define(`rp',     ``%rcx'')') dnl

IFDOS(`	define(`v0',     ``%r9'')') dnl

IFDOS(`	define(`r9',     ``rdi'')') dnl

IFDOS(`	define(`n_param',``%r8'')') dnl

IFDOS(`	define(`n',      ``%r8'')') dnl

IFDOS(`	define(`r8',     ``r11'')') dnl

ASM_START()

	TEXT

	ALIGN(16)

PROLOGUE(mpn_mul_1)

IFDOS(``push	%rsi		'')

IFDOS(``push	%rdi		'')

IFDOS(``mov	%rdx, %rsi	'')

	mov	(up), %rax

	mov	R32(`n_param'), R32(%r10)

IFSTD(`	mov	n_param, n		')

	lea	(up,n_param,8), up

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

	neg	n

	mul	v0

	and	$3, R32(%r10)

	jz	L(b0)

	cmp	$2, R32(%r10)

	jb	L(b1)

	jz	L(b2)

L(b3):	add	$-1, n

	mov	%rax, %r9

	mov	%rdx, %r8

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

	jmp	L(L3)

L(b1):	mov	%rax, %r9

	mov	%rdx, %r8

	add	$1, n

	jnc	L(L1)

	mov	%rax, (rp)

	mov	%rdx, %rax

IFDOS(``pop	%rdi		'')

IFDOS(``pop	%rsi		'')

	ret

L(b2):	add	$-2, n

	mov	%rax, %r8

	mov	%rdx, %r9

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

	jmp	L(L2)

L(b0):	mov	%rax, %r8

	mov	%rdx, %r9

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

	jmp	L(L0)

	ALIGN(8)

L(top):	mov	%rdx, %r8

	add	%rax, %r9

L(L1):	mov	0(up,n,8), %rax

	adc	$0, %r8

	mul	v0

	add	%rax, %r8

	mov	%r9, 0(rp,n,8)

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

	mov	%rdx, %r9

	adc	$0, %r9

L(L0):	mul	v0

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

	add	%rax, %r9

	mov	%rdx, %r8

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

	adc	$0, %r8

L(L3):	mul	v0

	mov	%r9, 16(rp,n,8)

	mov	%rdx, %r9

	add	%rax, %r8

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

	adc	$0, %r9

L(L2):	mul	v0

	mov	%r8, 24(rp,n,8)

	add	$4, n

	jnc	L(top)

L(end):	add	%rax, %r9

	mov	%rdx, %rax

	adc	$0, %rax

	mov	%r9, (rp)

IFDOS(``pop	%rdi		'')

IFDOS(``pop	%rsi		'')

	ret

EPILOGUE()