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; HP-PA 2.0 __gmpn_rshift --
; Copyright (C) 1997, 2000 Free Software Foundation, Inc.
; This file is part of the GNU MP Library.
; The GNU MP Library is free software; you can redistribute it and/or modify
; it under the terms of the GNU Lesser General Public License as published by
; the Free Software Foundation; either version 2.1 of the License, or (at your
; option) any later version.
; The GNU MP Library is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
; License for more details.
; You should have received a copy of the GNU Lesser General Public License
; along with the GNU MP Library; see the file COPYING.LIB. If not, write to
; the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
; MA 02111-1307, USA.
; INPUT PARAMETERS
; res_ptr gr26
; s1_ptr gr25
; size gr24
; cnt gr23
; This runs at 1.5 cycles/limb on PA8000.
.level 2.0n
.code
.export __gmpn_rshift,entry
__gmpn_rshift
.proc
.callinfo frame=0,args_saved
.entry
mtsar %r23
ldd 0(%r25),%r21
addib,= -1,%r24,L$end
shrpd %r21,%r0,%sar,%r29 ; compute carry out limb
depw,z %r24,31,3,%r28 ; r28 = (size & 7)
sub %r0,%r24,%r22
depw,z %r22,28,3,%r22 ; r22 = 8 * (-size & 7)
sub %r25,%r22,%r25 ; offset s1_ptr
blr %r28,%r0 ; branch into jump table
sub %r26,%r22,%r26 ; offset res_ptr
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$7
copy %r21,%r20
L$loop
L$0 ldd 8(%r25),%r20
shrpd %r20,%r21,%sar,%r21
std %r21,0(%r26)
L$7 ldd 16(%r25),%r21
shrpd %r21,%r20,%sar,%r20
std %r20,8(%r26)
L$6 ldd 24(%r25),%r20
shrpd %r20,%r21,%sar,%r21
std %r21,16(%r26)
L$5 ldd 32(%r25),%r21
shrpd %r21,%r20,%sar,%r20
std %r20,24(%r26)
L$4 ldd 40(%r25),%r20
shrpd %r20,%r21,%sar,%r21
std %r21,32(%r26)
L$3 ldd 48(%r25),%r21
shrpd %r21,%r20,%sar,%r20
std %r20,40(%r26)
L$2 ldd 56(%r25),%r20
shrpd %r20,%r21,%sar,%r21
std %r21,48(%r26)
L$1 ldd 64(%r25),%r21
ldo 64(%r25),%r25
shrpd %r21,%r20,%sar,%r20
std %r20,56(%r26)
addib,> -8,%r24,L$loop
ldo 64(%r26),%r26
L$end shrpd %r0,%r21,%sar,%r21
std %r21,0(%r26)
bve (%r2)
.exit
extrd,u %r29,31,32,%r28
.procend
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