dnl  AMD64 mpn_mullo_basecase optimised for Intel Haswell.

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	n/a		n/a

C AMD K10	n/a		n/a

C AMD bull	n/a		n/a

C AMD pile	n/a		n/a

C AMD steam	 ?		 ?

C AMD bobcat	n/a		n/a

C AMD jaguar	 ?		 ?

C Intel P4	n/a		n/a

C Intel core	n/a		n/a

C Intel NHM	n/a		n/a

C Intel SBR	n/a		n/a

C Intel IBR	n/a		n/a

C Intel HWL	 1.86		 2.15

C Intel BWL	 ?		 ?

C Intel atom	n/a		n/a

C VIA nano	n/a		n/a

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   * 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	vp_param, vp

	mov	(up), %rdx

	cmp	$4, n

	jb	L(small)

	push	%rbx

	push	%rbp

	push	%r12

	push	%r13

	mov	(vp), v0

	mov	8(vp), v1

	lea	2(n), i

	shr	$2, i

	neg	n

	add	$2, n

	push	up			C put entry `up' on stack

	test	$1, R8(n)

	jnz	L(m2x1)

L(m2x0):mulx(	v0, w0, w3)

	xor	R32(w2), R32(w2)

	test	$2, R8(n)

	jz	L(m2b2)

L(m2b0):lea	-8(rp), rp

	lea	-8(up), up

	jmp	L(m2e0)

L(m2b2):lea	-24(rp), rp

	lea	8(up), up

	jmp	L(m2e2)

L(m2x1):mulx(	v0, w2, w1)

	xor	R32(w0), R32(w0)

	test	$2, R8(n)

	jnz	L(m2b3)

L(m2b1):jmp	L(m2e1)

L(m2b3):lea	-16(rp), rp

	lea	-16(up), up

	jmp	L(m2e3)

	ALIGN(16)

L(m2tp):mulx(	v1, %rax, w0)

	add	%rax, w2

	mov	(up), %rdx

	mulx(	v0, %rax, w1)

	adc	$0, w0

	add	%rax, w2

	adc	$0, w1

	add	w3, w2

L(m2e1):mov	w2, (rp)

	adc	$0, w1

	mulx(	v1, %rax, w2)

	add	%rax, w0

	mov	8(up), %rdx

	adc	$0, w2

	mulx(	v0, %rax, w3)

	add	%rax, w0

	adc	$0, w3

	add	w1, w0

L(m2e0):mov	w0, 8(rp)

	adc	$0, w3

	mulx(	v1, %rax, w0)

	add	%rax, w2

	mov	16(up), %rdx

	mulx(	v0, %rax, w1)

	adc	$0, w0

	add	%rax, w2

	adc	$0, w1

	add	w3, w2

L(m2e3):mov	w2, 16(rp)

	adc	$0, w1

	mulx(	v1, %rax, w2)

	add	%rax, w0

	mov	24(up), %rdx

	adc	$0, w2

	mulx(	v0, %rax, w3)

	add	%rax, w0

	adc	$0, w3

	add	w1, w0

	lea	32(up), up

L(m2e2):mov	w0, 24(rp)

	adc	$0, w3

	dec	i

	lea	32(rp), rp

	jnz	L(m2tp)

L(m2ed):mulx(	v1, %rax, w0)

	add	%rax, w2

	mov	(up), %rdx

	mulx(	v0, %rax, w1)

	add	w2, %rax

	add	w3, %rax

	mov	%rax, (rp)

	mov	(%rsp), up		C restore `up' to beginning

	lea	16(vp), vp

	lea	8(rp,n,8), rp		C put back rp to old rp + 2

	add	$2, n

	jge	L(cor1)

	push	%r14

	push	%r15

L(outer):

	mov	(vp), v0

	mov	8(vp), v1

	lea	(n), i

	sar	$2, i

	mov	(up), %rdx

	test	$1, R8(n)

	jnz	L(bx1)

L(bx0):	mov	(rp), X1

	mov	8(rp), X0

	mulx(	v0, %rax, w3)

	add	%rax, X1

	adc	$0, w3

	mulx(	v1, %rax, w0)

	add	%rax, X0

	adc	$0, w0

	mov	8(up), %rdx

	mov	X1, (rp)

	mulx(	v0, %rax, w1)

	test	$2, R8(n)

	jz	L(b2)

L(b0):	lea	8(rp), rp

	lea	8(up), up

	jmp	L(lo0)

L(b2):	mov	16(rp), X1

	lea	24(rp), rp

	lea	24(up), up

	jmp	L(lo2)

L(bx1):	mov	(rp), X0

	mov	8(rp), X1

	mulx(	v0, %rax, w1)

	add	%rax, X0

	mulx(	v1, %rax, w2)

	adc	$0, w1

	mov	X0, (rp)

	add	%rax, X1

	adc	$0, w2

	mov	8(up), %rdx

	test	$2, R8(n)

	jnz	L(b3)

L(b1):	lea	16(up), up

	lea	16(rp), rp

	jmp	L(lo1)

L(b3):	mov	16(rp), X0

	lea	32(up), up

	mulx(	v0, %rax, w3)

	inc	i

	jz	L(cj3)

	jmp	L(lo3)

	ALIGN(16)

L(top):	mulx(	v0, %rax, w3)

	add	w0, X1

	adc	$0, w2

L(lo3):	add	%rax, X1

	adc	$0, w3

	mulx(	v1, %rax, w0)

	add	%rax, X0

	adc	$0, w0

	lea	32(rp), rp

	add	w1, X1

	mov	-16(up), %rdx

	mov	X1, -24(rp)

	adc	$0, w3

	add	w2, X0

	mov	-8(rp), X1

	mulx(	v0, %rax, w1)

	adc	$0, w0

L(lo2):	add	%rax, X0

	mulx(	v1, %rax, w2)

	adc	$0, w1

	add	w3, X0

	mov	X0, -16(rp)

	adc	$0, w1

	add	%rax, X1

	adc	$0, w2

	add	w0, X1

	mov	-8(up), %rdx

	adc	$0, w2

L(lo1):	mulx(	v0, %rax, w3)

	add	%rax, X1

	adc	$0, w3

	mov	(rp), X0

	mulx(	v1, %rax, w0)

	add	%rax, X0

	adc	$0, w0

	add	w1, X1

	mov	X1, -8(rp)

	adc	$0, w3

	mov	(up), %rdx

	add	w2, X0

	mulx(	v0, %rax, w1)

	adc	$0, w0

L(lo0):	add	%rax, X0

	adc	$0, w1

	mulx(	v1, %rax, w2)

	add	w3, X0

	mov	8(rp), X1

	mov	X0, (rp)

	mov	16(rp), X0

	adc	$0, w1

	add	%rax, X1

	adc	$0, w2

	mov	8(up), %rdx

	lea	32(up), up

	inc	i

	jnz	L(top)

L(end):	mulx(	v0, %rax, w3)

	add	w0, X1

	adc	$0, w2

L(cj3):	add	%rax, X1

	adc	$0, w3

	mulx(	v1, %rax, w0)

	add	%rax, X0

	add	w1, X1

	mov	-16(up), %rdx

	mov	X1, 8(rp)

	adc	$0, w3

	add	w2, X0

	mulx(	v0, %rax, w1)

	add	X0, %rax

	add	w3, %rax

	mov	%rax, 16(rp)

	mov	16(%rsp), up		C restore `up' to beginning

	lea	16(vp), vp

	lea	24(rp,n,8), rp		C put back rp to old rp + 2

	add	$2, n

	jl	L(outer)

	pop	%r15

	pop	%r14

	jnz	L(cor0)

L(cor1):mov	(vp), v0

	mov	8(vp), v1

	mov	(up), %rdx

	mulx(	v0, %r12, %rbp)		C u0 x v2

	add	(rp), %r12		C FIXME: rp[0] still available in reg?

	adc	%rax, %rbp

	mov	8(up), %r10

	imul	v0, %r10

	imul	v1, %rdx

	mov	%r12, (rp)

	add	%r10, %rdx

	add	%rbp, %rdx

	mov	%rdx, 8(rp)

	pop	%rax			C deallocate `up' copy

	pop	%r13

	pop	%r12

	pop	%rbp

	pop	%rbx

	FUNC_EXIT()

	ret

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

	imul	(up), %r11

	add	%rax, %r11

	mov	%r11, (rp)

	pop	%rax			C deallocate `up' copy

	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), %rdx

	mov	%rdx, (rp)

	FUNC_EXIT()

	ret

L(gt1):	ja	L(gt2)

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

	mulx(	%r9, %rax, %rdx)

	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), %r9

	mulx(	%r9, %rax, %r10)	C u0 x v0

	mov	%rax, (rp)

	mov	8(up), %rdx

	mulx(	%r9, %rax, %rdx)	C u1 x v0

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

	add	%rax, %r10

	adc	%rdx, %r9

	mov	8(vp), %r11

	mov	(up), %rdx

	mulx(	%r11, %rax, %rdx)	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