dnl  AMD64 mpn_mul_1 optimised for Intel Broadwell.

dnl  Copyright 2015 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	n/a

C AMD K10	n/a

C AMD bull	n/a

C AMD pile	n/a

C AMD steam	n/a

C AMD bobcat	n/a

C AMD jaguar	n/a

C Intel P4	n/a

C Intel core2	n/a

C Intel NHM	n/a

C Intel SBR	n/a

C Intel IBR	n/a

C Intel HWL	 1.68

C Intel BWL	 1.69

C Intel atom	n/a

C Intel SLM	n/a

C VIA nano	n/a

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  * Put an initial mulx before switching, targeting some free registers.

C  * Tune feed-in code.

C  * Trim nop execution after L(f2).

C  * Port to DOS64, not forgetting nop execution.

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

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

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

define(`v0_param',`%rcx')   C r9

define(`n',       `%rcx')

dnl ABI_SUPPORT(DOS64)

ABI_SUPPORT(STD64)

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

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

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

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

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

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

ASM_START()

	TEXT

	ALIGN(32)

PROLOGUE(mpn_mul_1)

	mov	v0_param, %r10

	mov	n_param, n

	mov	R32(n_param), R32(%r8)

	shr	$3, n

	and	$7, R32(%r8)		C clear OF, CF as side-effect

	mov	%r10, %rdx

	lea	L(tab)(%rip), %r10

ifdef(`PIC',

`	movslq	(%r10,%r8,4), %r8

	lea	(%r8, %r10), %r10

	jmp	*%r10

',`

	jmp	*(%r10,%r8,8)

')

	JUMPTABSECT

	ALIGN(8)

L(tab):	JMPENT(	L(f0), L(tab))

	JMPENT(	L(f1), L(tab))

	JMPENT(	L(f2), L(tab))

	JMPENT(	L(f3), L(tab))

	JMPENT(	L(f4), L(tab))

	JMPENT(	L(f5), L(tab))

	JMPENT(	L(f6), L(tab))

	JMPENT(	L(f7), L(tab))

	TEXT

L(f0):	CFPROT_ENDBR

	mulx(	(up), %r10, %r8)

	lea	56(up), up

	lea	-8(rp), rp

	jmp	L(b0)

L(f3):	CFPROT_ENDBR

	mulx(	(up), %r9, %rax)

	lea	16(up), up

	lea	16(rp), rp

	inc	n

	jmp	L(b3)

L(f4):	CFPROT_ENDBR

	mulx(	(up), %r10, %r8)

	lea	24(up), up

	lea	24(rp), rp

	inc	n

	jmp	L(b4)

L(f5):	CFPROT_ENDBR

	mulx(	(up), %r9, %rax)

	lea	32(up), up

	lea	32(rp), rp

	inc	n

	jmp	L(b5)

L(f6):	CFPROT_ENDBR

	mulx(	(up), %r10, %r8)

	lea	40(up), up

	lea	40(rp), rp

	inc	n

	jmp	L(b6)

L(f7):	CFPROT_ENDBR

	mulx(	(up), %r9, %rax)

	lea	48(up), up

	lea	48(rp), rp

	inc	n

	jmp	L(b7)

L(f1):	CFPROT_ENDBR

	mulx(	(up), %r9, %rax)

	test	n, n

	jnz	L(b1)

L(1):	mov	%r9, (rp)

	ret

L(f2):	CFPROT_ENDBR

	mulx(	(up), %r10, %r8)

	lea	8(up), up

	lea	8(rp), rp

	mulx(	(up), %r9, %rax)

	test	n, n

	jz	L(end)

	ALIGN(32)

L(top):	mov	%r10, -8(rp)

	adc	%r8, %r9

L(b1):	mulx(	8,(up), %r10, %r8)

	adc	%rax, %r10

	lea	64(up), up

	mov	%r9, (rp)

L(b0):	mov	%r10, 8(rp)

	mulx(	-48,(up), %r9, %rax)

	lea	64(rp), rp

	adc	%r8, %r9

L(b7):	mulx(	-40,(up), %r10, %r8)

	mov	%r9, -48(rp)

	adc	%rax, %r10

L(b6):	mov	%r10, -40(rp)

	mulx(	-32,(up), %r9, %rax)

	adc	%r8, %r9

L(b5):	mulx(	-24,(up), %r10, %r8)

	mov	%r9, -32(rp)

	adc	%rax, %r10

L(b4):	mulx(	-16,(up), %r9, %rax)

	mov	%r10, -24(rp)

	adc	%r8, %r9

L(b3):	mulx(	-8,(up), %r10, %r8)

	adc	%rax, %r10

	mov	%r9, -16(rp)

	dec	n

	mulx(	(up), %r9, %rax)

	jnz	L(top)

L(end):	mov	%r10, -8(rp)

	adc	%r8, %r9

	mov	%r9, (rp)

	adc	%rcx, %rax

	ret

EPILOGUE()

ASM_END()

CF_PROT