dnl  AMD64 mpn_copyi optimised for CPUs with fast SSE.

dnl  Copyright 2003, 2005, 2007, 2011, 2012, 2015 Free Software Foundation,

dnl  Inc.

dnl  Contributed to the GNU project by Torbjörn Granlund.

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     cycles/limb     cycles/limb      good

C              aligned	      unaligned	      best seen	     for cpu?

C AMD K8,K9

C AMD K10	 0.85		 1.64				Y/N

C AMD bull	 1.4		 1.4				N

C AMD pile	 0.77		 0.93				N

C AMD steam	 ?		 ?

C AMD excavator	 ?		 ?

C AMD bobcat

C AMD jaguar	 0.65		 1.02		opt/0.93	Y/N

C Intel P4	 2.3		 2.3				Y

C Intel core	 1.0		 1.0		0.52/0.64	N

C Intel NHM	 0.5		 0.67				Y

C Intel SBR	 0.51		 0.75		opt/0.54	Y/N

C Intel IBR	 0.50		 0.57		opt/0.54	Y

C Intel HWL	 0.50		 0.57		opt/0.51	Y

C Intel BWL	 0.55		 0.62		opt/0.55	Y

C Intel atom

C Intel SLM	 1.02		 1.27		opt/1.07	Y/N

C VIA nano	 1.16		 5.16				Y/N

C We try to do as many 16-byte operations as possible.  The top-most and

C bottom-most writes might need 8-byte operations.  We can always write using

C aligned 16-byte operations, we read with both aligned and unaligned 16-byte

C operations.

C Instead of having separate loops for reading aligned and unaligned, we read

C using MOVDQU.  This seems to work great except for core2; there performance

C doubles when reading using MOVDQA (for aligned source).  It is unclear how to

C best handle the unaligned case there.

C INPUT PARAMETERS

define(`rp', `%rdi')

define(`up', `%rsi')

define(`n',  `%rdx')

ABI_SUPPORT(DOS64)

ABI_SUPPORT(STD64)

dnl define(`movdqu', lddqu)

ASM_START()

	TEXT

	ALIGN(64)

PROLOGUE(mpn_copyi)

	FUNC_ENTRY(3)

	cmp	$3, n			C NB: bc code below assumes this limit

	jc	L(bc)

	test	$8, R8(rp)		C is rp 16-byte aligned?

	jz	L(ali)			C jump if rp aligned

	movsq				C copy single limb

	dec	n

	sub	$16, n

	jc	L(sma)

	ALIGN(16)

L(top):	movdqu	(up), %xmm0

	movdqu	16(up), %xmm1

	movdqu	32(up), %xmm2

	movdqu	48(up), %xmm3

	movdqu	64(up), %xmm4

	movdqu	80(up), %xmm5

	movdqu	96(up), %xmm6

	movdqu	112(up), %xmm7

	lea	128(up), up

	movdqa	%xmm0, (rp)

	movdqa	%xmm1, 16(rp)

	movdqa	%xmm2, 32(rp)

	movdqa	%xmm3, 48(rp)

	movdqa	%xmm4, 64(rp)

	movdqa	%xmm5, 80(rp)

	movdqa	%xmm6, 96(rp)

	movdqa	%xmm7, 112(rp)

	lea	128(rp), rp

L(ali):	sub	$16, n

	jnc	L(top)

L(sma):	test	$8, R8(n)

	jz	1f

	movdqu	(up), %xmm0

	movdqu	16(up), %xmm1

	movdqu	32(up), %xmm2

	movdqu	48(up), %xmm3

	lea	64(up), up

	movdqa	%xmm0, (rp)

	movdqa	%xmm1, 16(rp)

	movdqa	%xmm2, 32(rp)

	movdqa	%xmm3, 48(rp)

	lea	64(rp), rp

1:

	test	$4, R8(n)

	jz	1f

	movdqu	(up), %xmm0

	movdqu	16(up), %xmm1

	lea	32(up), up

	movdqa	%xmm0, (rp)

	movdqa	%xmm1, 16(rp)

	lea	32(rp), rp

1:

	test	$2, R8(n)

	jz	1f

	movdqu	(up), %xmm0

	lea	16(up), up

	movdqa	%xmm0, (rp)

	lea	16(rp), rp

	ALIGN(16)

1:

L(end):	test	$1, R8(n)

	jz	1f

	mov	(up), %r8

	mov	%r8, (rp)

1:

	FUNC_EXIT()

	ret

C Basecase code.  Needed for good small operands speed, not for correctness as

C the above code is currently written.  The commented-out lines need to be

C reinstated if this code is to be used for n > 3, and then the post loop

C offsets need fixing.

L(bc):	sub	$2, n

	jc	L(end)

	ALIGN(16)

1:	mov	(up), %rax

	mov	8(up), %rcx

dnl	lea	16(up), up

	mov	%rax, (rp)

	mov	%rcx, 8(rp)

dnl	lea	16(rp), rp

dnl	sub	$2, n

dnl	jnc	1b

	test	$1, R8(n)

	jz	L(ret)

	mov	16(up), %rax

	mov	%rax, 16(rp)

L(ret):	FUNC_EXIT()

	ret

EPILOGUE()