dnl  IA-64 mpn_lshift/mpn_rshift.

dnl  Contributed to the GNU project by Torbjorn Granlund.

dnl  Copyright 2000-2005 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 Itanium:      2

C Itanium 2:    1

C This code is scheduled deeply since the plain shift instructions shr and shl

C have a latency of 4 (on Itanium) or 3 (on Itanium 2).  Poor scheduling of

C these instructions cause a 10 cycle replay trap on Itanium.

C The ld8 scheduling should probably be decreased to make the function smaller.

C Good lfetch  will make sure we never stall anyway.

C We should actually issue the first ld8 at cycle 0, and the first BSH/FSH pair

C at cycle 2.  Judicious use of predicates could allow us to issue more ld8's

C in the prologue.

C INPUT PARAMETERS

define(`rp', `r32')

define(`up', `r33')

define(`n',  `r34')

define(`cnt',`r35')

define(`tnc',`r9')

ifdef(`OPERATION_lshift',`

	define(`FSH',`shl')

	define(`BSH',`shr.u')

	define(`UPD',`-8')

	define(`POFF',`-512')

	define(`PUPD',`-32')

	define(`func',`mpn_lshift')

')

ifdef(`OPERATION_rshift',`

	define(`FSH',`shr.u')

	define(`BSH',`shl')

	define(`UPD',`8')

	define(`POFF',`512')

	define(`PUPD',`32')

	define(`func',`mpn_rshift')

')

MULFUNC_PROLOGUE(mpn_lshift mpn_rshift)

ASM_START()

PROLOGUE(func)

	.prologue

	.save	ar.lc, r2

	.body

ifdef(`HAVE_ABI_32',

`	addp4	rp = 0, rp		C			M I

	addp4	up = 0, up		C		M I

	sxt4	n = n			C		M I

	nop.m		0

	nop.m		0

	zxt4	cnt = cnt		C		I

	;;

')

 {.mmi;	cmp.lt	p14, p15 = 4, n		C		M I

	and	r14 = 3, n		C		M I

	mov.i	r2 = ar.lc		C		I0

}{.mmi;	add	r15 = -1, n		C		M I

	sub	tnc = 64, cnt		C		M I

	add	r16 = -5, n

	;;

}{.mmi;	cmp.eq	p6, p0 = 1, r14		C		M I

	cmp.eq	p7, p0 = 2, r14		C		M I

	shr.u	n = r16, 2		C		I0

}{.mmi;	cmp.eq	p8, p0 = 3, r14		C		M I

ifdef(`OPERATION_lshift',

`	shladd	up = r15, 3, up		C		M I

	shladd	rp = r15, 3, rp')	C		M I

	;;

}{.mmi;	add	r11 = POFF, up		C		M I

	ld8	r10 = [up], UPD		C		M01

	mov.i	ar.lc = n		C		I0

}{.bbb;

   (p6)	br.dptk	.Lb01

   (p7)	br.dptk	.Lb10

   (p8)	br.dptk	.Lb11

	;; }

.Lb00:	ld8	r19 = [up], UPD

	;;

	ld8	r16 = [up], UPD

	;;

	ld8	r17 = [up], UPD

	BSH	r8 = r10, tnc		C function return value

	;;

	FSH	r24 = r10, cnt

	BSH	r25 = r19, tnc

  (p14)	br.cond.dptk	.grt4

	;;

	FSH	r26 = r19, cnt

	BSH	r27 = r16, tnc

	;;

	FSH	r20 = r16, cnt

	BSH	r21 = r17, tnc

	;;

	or	r14 = r25, r24

	FSH	r22 = r17, cnt

	BSH	r23 = r10, tnc

	br	.Lr4

.grt4:	ld8	r18 = [up], UPD

	FSH	r26 = r19, cnt

	BSH	r27 = r16, tnc

	;;

	ld8	r19 = [up], UPD

	FSH	r20 = r16, cnt

	BSH	r21 = r17, tnc

	;;

	ld8	r16 = [up], UPD

	FSH	r22 = r17, cnt

	BSH	r23 = r18, tnc

	;;

	or	r14 = r25, r24

	ld8	r17 = [up], UPD

	br.cloop.dpnt	.Ltop

	br	.Lbot

.Lb01:

  (p15)	BSH	r8 = r10, tnc		C function return value	I

  (p15)	FSH	r22 = r10, cnt		C		I

  (p15)	br.cond.dptk	.Lr1		C return	B

.grt1:	ld8	r18 = [up], UPD

	;;

	ld8	r19 = [up], UPD

	BSH	r8 = r10, tnc		C function return value

	;;

	ld8	r16 = [up], UPD

	FSH	r22 = r10, cnt

	BSH	r23 = r18, tnc

	;;

	ld8	r17 = [up], UPD

	FSH	r24 = r18, cnt

	BSH	r25 = r19, tnc

	br.cloop.dpnt	.grt5

	;;

	or	r15 = r23, r22

	FSH	r26 = r19, cnt

	BSH	r27 = r16, tnc

	;;

	FSH	r20 = r16, cnt

	BSH	r21 = r17, tnc

	br	.Lr5

.grt5:	ld8	r18 = [up], UPD

	FSH	r26 = r19, cnt

	BSH	r27 = r16, tnc

	;;

	ld8	r19 = [up], UPD

	FSH	r20 = r16, cnt

	BSH	r21 = r17, tnc

	;;

	or	r15 = r23, r22

	ld8	r16 = [up], UPD

	br	.LL01

.Lb10:	ld8	r17 = [up], UPD

  (p14)	br.cond.dptk	.grt2

	BSH	r8 = r10, tnc		C function return value

	;;

	FSH	r20 = r10, cnt

	BSH	r21 = r17, tnc

	;;

	or	r14 = r21, r20

	FSH	r22 = r17, cnt

	br	.Lr2			C return

.grt2:	ld8	r18 = [up], UPD

	BSH	r8 = r10, tnc		C function return value

	;;

	ld8	r19 = [up], UPD

	FSH	r20 = r10, cnt

	BSH	r21 = r17, tnc

	;;

	ld8	r16 = [up], UPD

	FSH	r22 = r17, cnt

	BSH	r23 = r18, tnc

	;;

 {.mmi;	ld8	r17 = [up], UPD

	or	r14 = r21, r20

	FSH	r24 = r18, cnt

}{.mib;	nop	0

	BSH	r25 = r19, tnc

	br.cloop.dpnt	.grt6

	;; }

	FSH	r26 = r19, cnt

	BSH	r27 = r16, tnc

	br	.Lr6

.grt6:	ld8	r18 = [up], UPD

	FSH	r26 = r19, cnt

	BSH	r27 = r16, tnc

	;;

	ld8	r19 = [up], UPD

	br	.LL10

.Lb11:	ld8	r16 = [up], UPD

	;;

	ld8	r17 = [up], UPD

	BSH	r8 = r10, tnc		C function return value

  (p14)	br.cond.dptk	.grt3

	;;

	FSH	r26 = r10, cnt

	BSH	r27 = r16, tnc

	;;

	FSH	r20 = r16, cnt

	BSH	r21 = r17, tnc

	;;

	or	r15 = r27, r26

	FSH	r22 = r17, cnt

	br	.Lr3			C return

.grt3:	ld8	r18 = [up], UPD

	FSH	r26 = r10, cnt

	BSH	r27 = r16, tnc

	;;

	ld8	r19 = [up], UPD

	FSH	r20 = r16, cnt

	BSH	r21 = r17, tnc

	;;

	ld8	r16 = [up], UPD

	FSH	r22 = r17, cnt

	BSH	r23 = r18, tnc

	;;

	ld8	r17 = [up], UPD

	br.cloop.dpnt	.grt7

	or	r15 = r27, r26

	FSH	r24 = r18, cnt

	BSH	r25 = r19, tnc

	br	.Lr7

.grt7:	or	r15 = r27, r26

	FSH	r24 = r18, cnt

	BSH	r25 = r19, tnc

	ld8	r18 = [up], UPD

	br	.LL11

C *** MAIN LOOP START ***

	ALIGN(32)

.Ltop:

 {.mmi;	st8	[rp] = r14, UPD		C M2

	or	r15 = r27, r26		C M3

	FSH	r24 = r18, cnt		C I0

}{.mmi;	ld8	r18 = [up], UPD		C M1

	lfetch	[r11], PUPD

	BSH	r25 = r19, tnc		C I1

	;; }

.LL11:

 {.mmi;	st8	[rp] = r15, UPD

	or	r14 = r21, r20

	FSH	r26 = r19, cnt

}{.mmi;	ld8	r19 = [up], UPD

	nop.m	0

	BSH	r27 = r16, tnc

	;; }

.LL10:

 {.mmi;	st8	[rp] = r14, UPD

	or	r15 = r23, r22

	FSH	r20 = r16, cnt

}{.mmi;	ld8	r16 = [up], UPD

	nop.m	0

	BSH	r21 = r17, tnc

	;; }

.LL01:

 {.mmi;	st8	[rp] = r15, UPD

	or	r14 = r25, r24

	FSH	r22 = r17, cnt

}{.mib;	ld8	r17 = [up], UPD

	BSH	r23 = r18, tnc

	br.cloop.dptk	.Ltop

	;; }

C *** MAIN LOOP END ***

.Lbot:

 {.mmi;	st8	[rp] = r14, UPD

	or	r15 = r27, r26

	FSH	r24 = r18, cnt

}{.mib;	nop	0

	BSH	r25 = r19, tnc

	nop	0

	;; }

.Lr7:

 {.mmi;	st8	[rp] = r15, UPD

	or	r14 = r21, r20

	FSH	r26 = r19, cnt

}{.mib;	nop	0

	BSH	r27 = r16, tnc

	nop	0

	;; }

.Lr6:

 {.mmi;	st8	[rp] = r14, UPD

	or	r15 = r23, r22

	FSH	r20 = r16, cnt

}{.mib;	nop	0

	BSH	r21 = r17, tnc

	nop	0

	;; }

.Lr5:	st8	[rp] = r15, UPD

	or	r14 = r25, r24

	FSH	r22 = r17, cnt

	;;

.Lr4:	st8	[rp] = r14, UPD

	or	r15 = r27, r26

	;;

.Lr3:	st8	[rp] = r15, UPD

	or	r14 = r21, r20

	;;

.Lr2:	st8	[rp] = r14, UPD

	;;

.Lr1:	st8	[rp] = r22, UPD		C		M23

	mov	ar.lc = r2		C		I0

	br.ret.sptk.many b0		C		B

EPILOGUE(func)

ASM_END()