dnl  AMD64 mpn_mullo_basecase optimised for Intel Sandy bridge and Ivy bridge.

dnl  Contributed to the GNU project by Torbjörn Granlund.

dnl  Copyright 2008, 2009, 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	mul_2		addmul_2

C AMD K8,K9

C AMD K10

C AMD bull

C AMD pile

C AMD steam

C AMD bobcat

C AMD jaguar

C Intel P4

C Intel core

C Intel NHM

C Intel SBR	 2.5		 2.95

C Intel IBR	 2.3		 2.68

C Intel HWL	 2.0		 2.5

C Intel BWL

C Intel atom

C VIA nano

C The inner loops of this code are the result of running a code generation and

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

C TODO

C   * Implement proper cor2, replacing current cor0.

C   * Offset n by 2 in order to avoid the outer loop cmp.  (And sqr_basecase?)

C   * Micro-optimise.

C When playing with pointers, set this to $2 to fall back to conservative

C indexing in wind-down code.

define(`I',`$1')

define(`rp',       `%rdi')

define(`up',       `%rsi')

define(`vp_param', `%rdx')

define(`n',        `%rcx')

define(`vp',       `%r8')

define(`X0',       `%r14')

define(`X1',       `%r15')

define(`w0',       `%r10')

define(`w1',       `%r11')

define(`w2',       `%r12')

define(`w3',       `%r13')

define(`i',        `%rbp')

define(`v0',       `%r9')

define(`v1',       `%rbx')

C rax rbx rcx rdx rdi rsi rbp r8 r9 r10 r11 r12 r13 r14 r15

ABI_SUPPORT(DOS64)

ABI_SUPPORT(STD64)

ASM_START()

	TEXT

	ALIGN(32)

PROLOGUE(mpn_mullo_basecase)

	FUNC_ENTRY(4)

	mov	(up), %rax

	mov	vp_param, vp

	cmp	$4, n

	jb	L(small)

	mov	(vp_param), v0

	push	%rbx

	lea	(rp,n,8), rp		C point rp at R[un]

	push	%rbp

	lea	(up,n,8), up		C point up right after U's end

	push	%r12

	neg	n

	push	%r13

	mul	v0

	mov	8(vp), v1

	test	$1, R8(n)

	jnz	L(m2b1)

L(m2b0):lea	(n), i

	xor	w0, w0

	mov	%rax, w2

	mov	%rdx, w1

	jmp	L(m2l0)

L(m2b1):lea	1(n), i

	xor	w1, w1

	xor	w2, w2

	mov	%rax, w0

	mov	%rdx, w3

	jmp	L(m2l1)

	ALIGN(32)

L(m2tp):mul	v0

	add	%rax, w0

	mov	%rdx, w3

	adc	$0, w3

L(m2l1):mov	-8(up,i,8), %rax

	mul	v1

	add	w1, w0

	adc	$0, w3

	add	%rax, w2

	mov	w0, -8(rp,i,8)

	mov	%rdx, w0

	adc	$0, w0

	mov	(up,i,8), %rax

	mul	v0

	add	%rax, w2

	mov	%rdx, w1

	adc	$0, w1

	add	w3, w2

L(m2l0):mov	(up,i,8), %rax

	adc	$0, w1

	mul	v1

	mov	w2, (rp,i,8)

	add	%rax, w0

	mov	%rdx, w2		C FIXME: dead in last iteration

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

	adc	$0, w2			C FIXME: dead in last iteration

	add	$2, i

	jnc	L(m2tp)

L(m2ed):imul	v0, %rax

	add	w0, %rax

	add	w1, %rax

	mov	%rax, I(-8(rp),-8(rp,i,8))

	add	$2, n

	lea	16(vp), vp

	lea	-16(up), up

	cmp	$-2, n

	jge	L(cor1)

	push	%r14

	push	%r15

L(outer):

	mov	(vp), v0

	mov	8(vp), v1

	mov	(up,n,8), %rax

	mul	v0

	test	$1, R8(n)

	jnz	L(a1x1)

L(a1x0):mov	(rp,n,8), X1

	xor	w2, w2

	xor	w1, w1

	test	$2, R8(n)

	jnz	L(a110)

L(a100):lea	1(n), i

	jmp	L(lo0)

L(a110):lea	3(n), i

	mov	%rdx, w3

	add	%rax, X1

	mov	(up,n,8), %rax

	mov	8(rp,n,8), X0

	adc	$0, w3

	jmp	L(lo2)

L(a1x1):mov	(rp,n,8), X0

	xor	w0, w0

	mov	%rdx, w1

	test	$2, R8(n)

	jz	L(a111)

L(a101):lea	2(n), i

	add	%rax, X0

	adc	$0, w1

	mov	(up,n,8), %rax

	mul	v1

	mov	8(rp,n,8), X1

	jmp	L(lo1)

L(a111):lea	(n), i

	xor	w3, w3

	jmp	L(lo3)

	ALIGN(32)

L(top):

L(lo2):	mul	v1

	mov	%rdx, w0

	add	%rax, X0

	adc	$0, w0

	add	w1, X1

	adc	$0, w3

	add	w2, X0

	adc	$0, w0

	mov	-16(up,i,8), %rax

	mul	v0

	add	%rax, X0

	mov	%rdx, w1

	adc	$0, w1

	mov	-16(up,i,8), %rax

	mul	v1

	mov	X1, -24(rp,i,8)

	mov	-8(rp,i,8), X1

	add	w3, X0

	adc	$0, w1

L(lo1):	mov	%rdx, w2

	mov	X0, -16(rp,i,8)

	add	%rax, X1

	adc	$0, w2

	mov	-8(up,i,8), %rax

	add	w0, X1

	adc	$0, w2

	mul	v0

L(lo0):	add	%rax, X1

	mov	%rdx, w3

	adc	$0, w3

	mov	-8(up,i,8), %rax

	mul	v1

	add	w1, X1

	mov	(rp,i,8), X0

	adc	$0, w3

	mov	%rdx, w0

	add	%rax, X0

	adc	$0, w0

	mov	(up,i,8), %rax

	mul	v0

	add	w2, X0

	mov	X1, -8(rp,i,8)

	mov	%rdx, w1

	adc	$0, w0

L(lo3):	add	%rax, X0

	adc	$0, w1

	mov	(up,i,8), %rax

	add	w3, X0

	adc	$0, w1

	mul	v1

	mov	8(rp,i,8), X1

	add	%rax, X1

	mov	%rdx, w2

	adc	$0, w2

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

	mov	X0, (rp,i,8)

	mul	v0

	add	w0, X1

	mov	%rdx, w3

	adc	$0, w2

	add	%rax, X1

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

	mov	16(rp,i,8), X0

	adc	$0, w3

	add	$4, i

	jnc	L(top)

L(end):	imul	v1, %rax

	add	%rax, X0

	add	w1, X1

	adc	$0, w3

	add	w2, X0

	mov	I(-8(up),-16(up,i,8)), %rax

	imul	v0, %rax

	add	X0, %rax

	mov	X1, I(-16(rp),-24(rp,i,8))

	add	w3, %rax

	mov	%rax, I(-8(rp),-16(rp,i,8))

	add	$2, n

	lea	16(vp), vp

	lea	-16(up), up

	cmp	$-2, n

	jl	L(outer)

	pop	%r15

	pop	%r14

	jnz	L(cor0)

L(cor1):mov	(vp), v0

	mov	8(vp), v1

	mov	-16(up), %rax

	mul	v0			C u0 x v2

	add	-16(rp), %rax		C FIXME: rp[0] still available in reg?

	adc	-8(rp), %rdx		C FIXME: rp[1] still available in reg?

	mov	-8(up), %r10

	imul	v0, %r10

	mov	-16(up), %r11

	imul	v1, %r11

	mov	%rax, -16(rp)

	add	%r10, %r11

	add	%rdx, %r11

	mov	%r11, -8(rp)

	pop	%r13

	pop	%r12

	pop	%rbp

	pop	%rbx

	FUNC_EXIT()

	ret

L(cor0):mov	(vp), %r11

	imul	-8(up), %r11

	add	%rax, %r11

	mov	%r11, -8(rp)

	pop	%r13

	pop	%r12

	pop	%rbp

	pop	%rbx

	FUNC_EXIT()

	ret

	ALIGN(16)

L(small):

	cmp	$2, n

	jae	L(gt1)

L(n1):	imul	(vp_param), %rax

	mov	%rax, (rp)

	FUNC_EXIT()

	ret

L(gt1):	ja	L(gt2)

L(n2):	mov	(vp_param), %r9

	mul	%r9

	mov	%rax, (rp)

	mov	8(up), %rax

	imul	%r9, %rax

	add	%rax, %rdx

	mov	8(vp), %r9

	mov	(up), %rcx

	imul	%r9, %rcx

	add	%rcx, %rdx

	mov	%rdx, 8(rp)

	FUNC_EXIT()

	ret

L(gt2):

L(n3):	mov	(vp_param), %r9

	mul	%r9		C u0 x v0

	mov	%rax, (rp)

	mov	%rdx, %r10

	mov	8(up), %rax

	mul	%r9		C u1 x v0

	imul	16(up), %r9	C u2 x v0

	add	%rax, %r10

	adc	%rdx, %r9

	mov	8(vp), %r11

	mov	(up), %rax

	mul	%r11		C u0 x v1

	add	%rax, %r10

	adc	%rdx, %r9

	imul	8(up), %r11	C u1 x v1

	add	%r11, %r9

	mov	%r10, 8(rp)

	mov	16(vp), %r10

	mov	(up), %rax

	imul	%rax, %r10	C u0 x v2

	add	%r10, %r9

	mov	%r9, 16(rp)

	FUNC_EXIT()

	ret

EPILOGUE()

CF_PROT