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-/* IBM POWER lshift
- *
- * Copyright (C) 1992, 1994, 1999 Free Software Foundation, Inc.
- *
- * This file is part of GnuPG.
- *
- * GnuPG is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * GnuPG 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
- */
-
-#include "sysdep.h"
-#include "asm-syntax.h"
-
-/*
-# INPUT PARAMETERS
-# res_ptr r3
-# s_ptr r4
-# size r5
-# cnt r6
- */
-
- .toc
- .extern mpihelp_lshift[DS]
- .extern .mpihelp_lshift
-.csect [PR]
- .align 2
- .globl mpihelp_lshift
- .globl .mpihelp_lshift
- .csect mpihelp_lshift[DS]
-mpihelp_lshift:
- .long .mpihelp_lshift, TOC[tc0], 0
- .csect [PR]
-.mpihelp_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
-