2002-06-29 14:15:02 +00:00
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/* IBM POWER lshift
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*
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* Copyright (C) 1992, 1994, 1999 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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2005-05-31 08:39:18 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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2002-06-29 14:15:02 +00:00
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*/
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#include "sysdep.h"
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#include "asm-syntax.h"
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/*
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# INPUT PARAMETERS
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# res_ptr r3
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# s_ptr r4
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# size r5
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# cnt r6
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*/
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.toc
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.extern mpihelp_lshift[DS]
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.extern .mpihelp_lshift
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.csect [PR]
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.align 2
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.globl mpihelp_lshift
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.globl .mpihelp_lshift
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.csect mpihelp_lshift[DS]
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mpihelp_lshift:
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.long .mpihelp_lshift, TOC[tc0], 0
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.csect [PR]
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.mpihelp_lshift:
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sli 0,5,2
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cax 9,3,0
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cax 4,4,0
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sfi 8,6,32
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mtctr 5 # put limb count in CTR loop register
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lu 0,-4(4) # read most significant limb
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sre 3,0,8 # compute carry out limb, and init MQ register
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bdz Lend2 # if just one limb, skip loop
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lu 0,-4(4) # read 2:nd most significant limb
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sreq 7,0,8 # compute most significant limb of result
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bdz Lend # if just two limb, skip loop
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Loop: lu 0,-4(4) # load next lower limb
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stu 7,-4(9) # store previous result during read latency
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sreq 7,0,8 # compute result limb
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bdn Loop # loop back until CTR is zero
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Lend: stu 7,-4(9) # store 2:nd least significant limb
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Lend2: sle 7,0,6 # compute least significant limb
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st 7,-4(9) # store it
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br
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