dnl  HP-PA 2.0 mpn_rshift -- Right shift.

dnl  Copyright 1997, 2000, 2002, 2003 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/.

dnl  This runs at 1.5 cycles/limb on PA8000 and 1.0 cycles/limb on PA8500.

include(`../config.m4')

dnl  INPUT PARAMETERS

define(`rp',`%r26')

define(`up',`%r25')

define(`n',`%r24')

define(`cnt',`%r23')

ifdef(`HAVE_ABI_2_0w',

`       .level  2.0w

',`     .level  2.0

')

PROLOGUE(mpn_rshift)

	mtsar		cnt

	ldd		0(up), %r21

	addib,=		-1, n, L(end)

	shrpd		%r21, %r0, %sar, %r29	C compute carry out limb

	depw,z		n, 31, 3, %r28		C r28 = (size & 7)

	sub		%r0, n, %r22

	depw,z		%r22, 28, 3, %r22	C r22 = 8 * (-size & 7)

	sub		up, %r22, up		C offset up

	blr		%r28, %r0		C branch into jump table

	sub		rp, %r22, rp		C offset rp

	b		L(0)

	nop

	b		L(1)

	copy		%r21, %r20

	b		L(2)

	nop

	b		L(3)

	copy		%r21, %r20

	b		L(4)

	nop

	b		L(5)

	copy		%r21, %r20

	b		L(6)

	nop

	b		L(7)

	copy		%r21, %r20

LDEF(loop)

LDEF(0)	ldd		8(up), %r20

	shrpd		%r20, %r21, %sar, %r21

	std		%r21, 0(rp)

LDEF(7)	ldd		16(up), %r21

	shrpd		%r21, %r20, %sar, %r20

	std		%r20, 8(rp)

LDEF(6)	ldd		24(up), %r20

	shrpd		%r20, %r21, %sar, %r21

	std		%r21, 16(rp)

LDEF(5)	ldd		32(up), %r21

	shrpd		%r21, %r20, %sar, %r20

	std		%r20, 24(rp)

LDEF(4)	ldd		40(up), %r20

	shrpd		%r20, %r21, %sar, %r21

	std		%r21, 32(rp)

LDEF(3)	ldd		48(up), %r21

	shrpd		%r21, %r20, %sar, %r20

	std		%r20, 40(rp)

LDEF(2)	ldd		56(up), %r20

	shrpd		%r20, %r21, %sar, %r21

	std		%r21, 48(rp)

LDEF(1)	ldd		64(up), %r21

	ldo		64(up), up

	shrpd		%r21, %r20, %sar, %r20

	std		%r20, 56(rp)

	addib,>		-8, n, L(loop)

	ldo		64(rp), rp

LDEF(end)

	shrpd		%r0, %r21, %sar, %r21

	std		%r21, 0(rp)

	bve		(%r2)

ifdef(`HAVE_ABI_2_0w',

`	copy		%r29,%r28

',`	extrd,u		%r29, 31, 32, %r28

')

EPILOGUE(mpn_rshift)