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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)
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