mpir/mpn/ia64/rshift.asm

dnl  IA-64 mpn_lshift/mpn_rshift.

dnl  Copyright 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation,
dnl  Inc.

dnl  This file is part of the GNU MP Library.

dnl  The GNU MP Library is free software; you can redistribute it and/or modify
dnl  it under the terms of the GNU Lesser General Public License as published
dnl  by the Free Software Foundation; either version 3 of the License, or (at
dnl  your option) any later version.

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 Lesser General Public
dnl  License for more details.

dnl  You should have received a copy of the GNU Lesser General Public License
dnl  along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.

include(`../config.m4')

C           cycles/limb
C Itanium:      2.0
C Itanium 2:    1.0

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 TODO
C  * Optimize function entry and feed-in code.

C INPUT PARAMETERS
define(`rp',`r32')
define(`up',`r33')
define(`n',`r34')
define(`cnt',`r35')

define(`tnc',`r9')

define(`OPERATION_rshift',1)

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')
')

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
	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
  (p14)	br.cond.dptk	.grt4

	FSH		r24 = r10, cnt
	BSH		r25 = r19, tnc
	;;
	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:	FSH		r24 = r10, cnt
	BSH		r25 = r19, tnc
	;;
	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
	br.cloop.dpnt	.grt5
	;;

	FSH		r24 = r18, cnt
	BSH		r25 = r19, tnc
	;;
	or		r15 = r23, r22
	FSH		r26 = r19, cnt
	BSH		r27 = r16, tnc
	;;
	FSH		r20 = r16, cnt
	BSH		r21 = r17, tnc
	br		.Lr5

.grt5:	FSH		r24 = r18, cnt
	BSH		r25 = r19, tnc
	;;
	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
	;;
	ld8		r17 = [up], UPD
	br.cloop.dpnt	.grt6
	;;

	or		r14 = r21, r20
	FSH		r24 = r18, cnt
	BSH		r25 = r19, tnc
	;;
	FSH		r26 = r19, cnt
	BSH		r27 = r16, tnc
	br		.Lr6

.grt6:	or		r14 = r21, r20
	FSH		r24 = r18, cnt
	BSH		r25 = r19, tnc
	;;
	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:	or		r15 = r27, r26
	FSH		r24 = r18, cnt
	BSH		r25 = r19, tnc
	st8		[rp] = r14, UPD
	;;
.Lr7:	or		r14 = r21, r20
	FSH		r26 = r19, cnt
	BSH		r27 = r16, tnc
	st8		[rp] = r15, UPD
	;;
.Lr6:	or		r15 = r23, r22
	FSH		r20 = r16, cnt
	BSH		r21 = r17, tnc
	st8		[rp] = r14, UPD
	;;
.Lr5:	st8		[rp] = r15, UPD
	or		r14 = r25, r24
	FSH		r22 = r17, cnt
	;;
.Lr4:	or		r15 = r27, r26
	st8		[rp] = r14, UPD
	;;
.Lr3:	or		r14 = r21, r20
	st8		[rp] = r15, UPD
	;;
.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()