1995-10-16 09:18:40 +08:00
|
|
|
# IBM POWER __mpn_lshift --
|
|
|
|
|
|
|
|
|
|
# Copyright (C) 1992, 1994 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 Library General Public License as published by
|
|
|
|
|
# the Free Software Foundation; either version 2 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 Library General Public
|
|
|
|
|
# License for more details.
|
|
|
|
|
|
|
|
|
|
# You should have received a copy of the GNU Library General Public License
|
|
|
|
|
# along with the GNU MP Library; see the file COPYING.LIB. If not, write to
|
1996-05-08 05:04:45 +08:00
|
|
|
# the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
|
|
|
|
|
# MA 02111-1307, USA.
|
1995-10-16 09:18:40 +08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
# INPUT PARAMETERS
|
|
|
|
|
# res_ptr r3
|
|
|
|
|
# s_ptr r4
|
|
|
|
|
# size r5
|
|
|
|
|
# cnt r6
|
|
|
|
|
|
|
|
|
|
.toc
|
|
|
|
|
.extern __mpn_lshift[DS]
|
|
|
|
|
.extern .__mpn_lshift
|
|
|
|
|
.csect [PR]
|
|
|
|
|
.align 2
|
|
|
|
|
.globl __mpn_lshift
|
|
|
|
|
.globl .__mpn_lshift
|
|
|
|
|
.csect __mpn_lshift[DS]
|
|
|
|
|
__mpn_lshift:
|
|
|
|
|
.long .__mpn_lshift, TOC[tc0], 0
|
|
|
|
|
.csect [PR]
|
|
|
|
|
.__mpn_lshift:
|
|
|
|
|
sli 0,5,2
|
|
|
|
|
cax 9,3,0
|
|
|
|
|
cax 4,4,0
|
|
|
|
|
sfi 8,6,32
|
|
|
|
|
mtctr 5 # put limb count in CTR loop register
|
|
|
|
|
lu 0,-4(4) # read most significant limb
|
|
|
|
|
sre 3,0,8 # compute carry out limb, and init MQ register
|
|
|
|
|
bdz Lend2 # if just one limb, skip loop
|
|
|
|
|
lu 0,-4(4) # read 2:nd most significant limb
|
|
|
|
|
sreq 7,0,8 # compute most significant limb of result
|
|
|
|
|
bdz Lend # if just two limb, skip loop
|
|
|
|
|
Loop: lu 0,-4(4) # load next lower limb
|
|
|
|
|
stu 7,-4(9) # store previous result during read latency
|
|
|
|
|
sreq 7,0,8 # compute result limb
|
|
|
|
|
bdn Loop # loop back until CTR is zero
|
|
|
|
|
Lend: stu 7,-4(9) # store 2:nd least significant limb
|
|
|
|
|
Lend2: sle 7,0,6 # compute least significant limb
|
|
|
|
|
st 7,-4(9) # store it" \
|
|
|
|
|
br
|
