dnl  X86-64 mpn_redc_1 optimised for Intel Conroe and Wolfdale.

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 bull	 ?

C AMD pile	 ?

C AMD steam	 ?

C AMD bobcat	 ?

C AMD jaguar	 ?

C Intel P4	 ?

C Intel core	 4.5  (fluctuating)

C Intel NHM	 ?

C Intel SBR	 ?

C Intel IBR	 ?

C Intel HWL	 ?

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  * Micro-optimise, none performed thus far.

C  * Consider inlining mpn_add_n.

C  * Single basecases out before the pushes.

C  * Keep up[i] in registers for basecases (might require pushes).

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')   C rcx

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

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

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

define(`u0inv',       `%r8')    C stack

define(`i',           `%r14')

define(`j',           `%r15')

define(`mp',          `%r12')

define(`q0',          `%r13')

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

C  X  q0'  n   X  rp  up      u0i           mp   q0 i   j

ABI_SUPPORT(DOS64)

ABI_SUPPORT(STD64)

define(`ALIGNx', `ALIGN(16)')

ASM_START()

	TEXT

	ALIGN(32)

PROLOGUE(mpn_redc_1)

	FUNC_ENTRY(4)

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

	push	%rbx

	push	%rbp

	push	%r12

	push	%r13

	push	%r14

	push	%r15

	mov	(up), q0

	mov	n, j			C outer loop induction var

	lea	(mp_param,n,8), mp

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

	neg	n

	imul	u0inv, q0		C first iteration q0

	test	$1, R8(n)

	jz	L(b0)

L(b1):	cmp	$-1, R32(n)

	jz	L(n1)

	cmp	$-3, R32(n)

	jz	L(n3)

	push	rp

L(otp1):lea	3(n), i

	mov	(mp,n,8), %rax

	mul	q0

	lea	(%rax), %rbp

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

	lea	(%rdx), %r9

	mul	q0

	lea	(%rax), %r11

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

	mov	16(up,n,8), %r10

	lea	(%rdx), %rdi

	mul	q0

	add	%rbp, %r10

	lea	(%rax), %rbp

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

	adc	%r9, %r11

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

	lea	(%rdx), %r9

	adc	$0, %rdi

	mul	q0

	add	%r11, %rbx

	lea	(%rax), %r11

	mov	32(mp,n,8), %rax

	adc	%rdi, %rbp

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

	mov	32(up,n,8), %r10

	lea	(%rdx), %rdi

	adc	$0, %r9

	imul	u0inv, %rbx		C next q limb

	add	$2, i

	jns	L(ed1)

	ALIGNx

L(tp1):	mul	q0

	add	%rbp, %r10

	lea	(%rax), %rbp

	mov	(mp,i,8), %rax

	adc	%r9, %r11

	mov	%r10, -8(up,i,8)

	mov	(up,i,8), %r10

	lea	(%rdx), %r9

	adc	$0, %rdi

	mul	q0

	add	%r11, %r10

	lea	(%rax), %r11

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

	adc	%rdi, %rbp

	mov	%r10, (up,i,8)

	mov	8(up,i,8), %r10

	lea	(%rdx), %rdi

	adc	$0, %r9

	add	$2, i

	js	L(tp1)

L(ed1):	mul	q0

	add	%rbp, %r10

	adc	%r9, %r11

	mov	%r10, I(-8(up),-8(up,i,8))

	mov	I((up),(up,i,8)), %r10

	adc	$0, %rdi

	add	%r11, %r10

	adc	%rdi, %rax

	mov	%r10, I((up),(up,i,8))

	mov	I(8(up),8(up,i,8)), %r10

	adc	$0, %rdx

	add	%rax, %r10

	mov	%r10, I(8(up),8(up,i,8))

	adc	$0, %rdx

	mov	%rdx, 16(up,n,8)	C up[0]

	mov	%rbx, q0		C previously computed q limb -> q0

	lea	8(up), up		C up++

	dec	j

	jnz	L(otp1)

	jmp	L(cj)

L(b0):	cmp	$-2, R32(n)

	jz	L(n2)

	cmp	$-4, R32(n)

	jz	L(n4)

	push	rp

L(otp0):lea	4(n), i

	mov	(mp,n,8), %rax

	mul	q0

	lea	(%rax), %r11

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

	lea	(%rdx), %rdi

	mul	q0

	lea	(%rax), %rbp

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

	mov	16(up,n,8), %r10

	lea	(%rdx), %r9

	mul	q0

	add	%r11, %r10

	lea	(%rax), %r11

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

	adc	%rdi, %rbp

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

	lea	(%rdx), %rdi

	adc	$0, %r9

	mul	q0

	add	%rbp, %rbx

	lea	(%rax), %rbp

	mov	32(mp,n,8), %rax

	adc	%r9, %r11

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

	mov	32(up,n,8), %r10

	lea	(%rdx), %r9

	adc	$0, %rdi

	imul	u0inv, %rbx		C next q limb

	jmp	L(e0)

	ALIGNx

L(tp0):	mul	q0

	add	%rbp, %r10

	lea	(%rax), %rbp

	mov	(mp,i,8), %rax

	adc	%r9, %r11

	mov	%r10, -8(up,i,8)

	mov	(up,i,8), %r10

	lea	(%rdx), %r9

	adc	$0, %rdi

L(e0):	mul	q0

	add	%r11, %r10

	lea	(%rax), %r11

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

	adc	%rdi, %rbp

	mov	%r10, (up,i,8)

	mov	8(up,i,8), %r10

	lea	(%rdx), %rdi

	adc	$0, %r9

	add	$2, i

	js	L(tp0)

L(ed0):	mul	q0

	add	%rbp, %r10

	adc	%r9, %r11

	mov	%r10, I(-8(up),-8(up,i,8))

	mov	I((up),(up,i,8)), %r10

	adc	$0, %rdi

	add	%r11, %r10

	adc	%rdi, %rax

	mov	%r10, I((up),(up,i,8))

	mov	I(8(up),8(up,i,8)), %r10

	adc	$0, %rdx

	add	%rax, %r10

	mov	%r10, I(8(up),8(up,i,8))

	adc	$0, %rdx

	mov	%rdx, 16(up,n,8)	C up[0]

	mov	%rbx, q0		C previously computed q limb -> q0

	lea	8(up), up		C up++

	dec	j

	jnz	L(otp0)

L(cj):	lea	16(up), up		C FIXME

	pop	rp

L(add_n):

IFSTD(`	lea	(up,n,8), up		C param 2: up

	lea	(up,n,8), %rdx		C param 3: up - n

	neg	R32(n)		')	C param 4: n

IFDOS(`	lea	(up,n,8), %rdx		C param 2: up

	lea	(%rdx,n,8), %r8		C param 3: up - n

	neg	R32(n)

	mov	n, %r9			C param 4: n

	mov	rp, %rcx	')	C param 1: rp

IFSTD(`	sub	$8, %rsp	')

IFDOS(`	sub	$40, %rsp	')

	ASSERT(nz, `test $15, %rsp')

	CALL(	mpn_add_n)

IFSTD(`	add	$8, %rsp	')

IFDOS(`	add	$40, %rsp	')

L(ret):	pop	%r15

	pop	%r14

	pop	%r13

	pop	%r12

	pop	%rbp

	pop	%rbx

	FUNC_EXIT()

	ret

L(n1):	mov	(mp_param), %rax

	mul	q0

	add	8(up), %rax

	adc	16(up), %rdx

	mov	%rdx, (rp)

	mov	$0, R32(%rax)

	adc	R32(%rax), R32(%rax)

	jmp	L(ret)

L(n2):	mov	(mp_param), %rax

	mov	(up), %rbp

	mul	q0

	add	%rax, %rbp

	mov	%rdx, %r9

	adc	$0, %r9

	mov	-8(mp), %rax

	mov	8(up), %r10

	mul	q0

	add	%rax, %r10

	mov	%rdx, %r11

	adc	$0, %r11

	add	%r9, %r10

	adc	$0, %r11

	mov	%r10, q0

	imul	u0inv, q0		C next q0

	mov	-16(mp), %rax

	mul	q0

	add	%rax, %r10

	mov	%rdx, %r9

	adc	$0, %r9

	mov	-8(mp), %rax

	mov	16(up), %r14

	mul	q0

	add	%rax, %r14

	adc	$0, %rdx

	add	%r9, %r14

	adc	$0, %rdx

	xor	R32(%rax), R32(%rax)

	add	%r11, %r14

	adc	24(up), %rdx

	mov	%r14, (rp)

	mov	%rdx, 8(rp)

	adc	R32(%rax), R32(%rax)

	jmp	L(ret)

	ALIGNx

L(n3):	mov	-24(mp), %rax

	mov	-8(up), %r10

	mul	q0

	add	%rax, %r10

	mov	-16(mp), %rax

	mov	%rdx, %r11

	adc	$0, %r11

	mov	(up), %rbp

	mul	q0

	add	%rax, %rbp

	mov	%rdx, %r9

	adc	$0, %r9

	mov	-8(mp), %rax

	add	%r11, %rbp

	mov	8(up), %r10

	adc	$0, %r9

	mul	q0

	mov	%rbp, q0

	imul	u0inv, q0		C next q0

	add	%rax, %r10

	mov	%rdx, %r11

	adc	$0, %r11

	mov	%rbp, (up)

	add	%r9, %r10

	adc	$0, %r11

	mov	%r10, 8(up)

	mov	%r11, -8(up)		C up[0]

	lea	8(up), up		C up++

	dec	j

	jnz	L(n3)

	mov	-32(up), %rdx

	mov	-24(up), %rbx

	xor	R32(%rax), R32(%rax)

	add	%rbp, %rdx

	adc	%r10, %rbx

	adc	8(up), %r11

	mov	%rdx, (rp)

	mov	%rbx, 8(rp)

	mov	%r11, 16(rp)

	adc	R32(%rax), R32(%rax)

	jmp	L(ret)

	ALIGNx

L(n4):	mov	-32(mp), %rax

	mul	q0

	lea	(%rax), %r11

	mov	-24(mp), %rax

	lea	(%rdx), %r14

	mul	q0

	lea	(%rax), %rbp

	mov	-16(mp), %rax

	mov	-16(up), %r10

	lea	(%rdx), %r9

	mul	q0

	add	%r11, %r10

	lea	(%rax), %r11

	mov	-8(mp), %rax

	adc	%r14, %rbp

	mov	-8(up), %rbx

	lea	(%rdx), %r14

	adc	$0, %r9

	mul	q0

	add	%rbp, %rbx

	adc	%r9, %r11

	mov	%rbx, -8(up)

	mov	(up), %r10

	adc	$0, %r14

	imul	u0inv, %rbx		C next q limb

	add	%r11, %r10

	adc	%r14, %rax

	mov	%r10, (up)

	mov	8(up), %r10

	adc	$0, %rdx

	add	%rax, %r10

	mov	%r10, 8(up)

	adc	$0, %rdx

	mov	%rdx, -16(up)		C up[0]

	mov	%rbx, q0		C previously computed q limb -> q0

	lea	8(up), up		C up++

	dec	j

	jnz	L(n4)

	lea	16(up), up

	jmp	L(add_n)

EPILOGUE()

ASM_END()

CF_PROT