dnl  PowerPC-64 mpn_lshiftc -- rp[] = ~up[] << cnt

dnl  Copyright 2003, 2005, 2010, 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 POWER3/PPC630		 ?

C POWER4/PPC970		 ?

C POWER5		 2.25

C POWER6		 4

C TODO

C  * Micro-optimise header code

C  * Perhaps do 4-way unrolling, for 2.5 c/l on POWER6.  The code is 4236

C    bytes, 4-way code would become about 50% larger.

C INPUT PARAMETERS

define(`rp_param',  `r3')

define(`up',  `r4')

define(`n',   `r5')

define(`cnt', `r6')

define(`tnc',`r0')

define(`retval',`r3')

define(`rp',  `r7')

ASM_START()

PROLOGUE(mpn_lshiftc,toc)

ifdef(`HAVE_ABI_mode32',`

	rldicl	n, n, 0,32		C FIXME: avoid this zero extend

')

	mflr	r12

	sldi	r8, n, 3

	sldi	r10, cnt, 6		C multiply cnt by size of a SHIFT block

	LEAL(	r11, L(e1))		C address of L(e1) label in SHIFT(1)

	add	up, up, r8		C make up point at end of up[]

	add	r11, r11, r10		C address of L(oN) for N = cnt

	srdi	r10, n, 1

	add	rp, rp_param, r8	C make rp point at end of rp[]

	subfic	tnc, cnt, 64

	rlwinm.	r8, n, 0,31,31		C extract bit 0

	mtctr	r10

	beq	L(evn)

L(odd):	ld	r9, -8(up)

	cmpdi	cr0, n, 1		C n = 1?

	beq	L(1)

	ld	r8, -16(up)

	addi	r11, r11, -88		C L(o1) - L(e1) - 64

	mtlr	r11

	srd	r3, r9, tnc		C retval

	addi	up, up, 8

	addi	rp, rp, -8

	blr				C branch to L(oN)

L(evn):	ld	r8, -8(up)

	ld	r9, -16(up)

	addi	r11, r11, -64

	mtlr	r11

	srd	r3, r8, tnc		C retval

	blr				C branch to L(eN)

L(1):	srd	r3, r9, tnc		C retval

	sld	r8, r9, cnt

	nor	r8, r8, r8

	std	r8, -8(rp)

	mtlr	r12

ifdef(`HAVE_ABI_mode32',

`	mr	r4, r3

	srdi	r3, r3, 32

')

	blr

define(SHIFT,`

L(lo$1):ld	r8, -24(up)

	nor	r11, r11, r11

	std	r11, -8(rp)

	addi	rp, rp, -16

L(o$1):	srdi	r10, r8, eval(64-$1)

	rldimi	r10, r9, $1, 0

	ld	r9, -32(up)

	addi	up, up, -16

	nor	r10, r10, r10

	std	r10, 0(rp)

L(e$1):	srdi	r11, r9, eval(64-$1)

	rldimi	r11, r8, $1, 0

	bdnz	L(lo$1)

	sldi	r10, r9, $1

	b	L(com)

	nop

')

	ALIGN(64)

forloop(`i',1,63,`SHIFT(i)')

L(com):	nor	r11, r11, r11

	nor	r10, r10, r10

	std	r11, -8(rp)

	std	r10, -16(rp)

	mtlr	r12

ifdef(`HAVE_ABI_mode32',

`	mr	r4, r3

	srdi	r3, r3, 32

')

	blr

EPILOGUE()

ASM_END()