2002-06-29 14:15:02 +00:00
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/* PowerPC-32 rshift
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*
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* Copyright (C) 1995, 1998 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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#ifndef USE_PPC_PATCHES
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/*******************
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* mpi_limb_t
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* mpihelp_rshift( mpi_ptr_t wp, (r3)
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* mpi_ptr_t up, (r4)
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* mpi_size_t usize, (r5)
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* unsigned cnt) (r6)
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*/
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.toc
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.csect .text[PR]
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.align 2
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.globl mpihelp_rshift
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.globl .mpihelp_rshift
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.csect mpihelp_rshift[DS]
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mpihelp_rshift:
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.long .mpihelp_rshift, TOC[tc0], 0
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.csect .text[PR]
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.mpihelp_rshift:
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mtctr 5 # copy size into CTR
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addi 7,3,-4 # move adjusted res_ptr to free return reg
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subfic 8,6,32
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lwz 11,0(4) # load first s1 limb
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slw 3,11,8 # compute function return value
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bdz Lend1
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Loop: lwzu 10,4(4)
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srw 9,11,6
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slw 12,10,8
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or 9,9,12
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stwu 9,4(7)
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bdz Lend2
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lwzu 11,4(4)
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srw 9,10,6
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slw 12,11,8
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or 9,9,12
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stwu 9,4(7)
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bdnz Loop
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Lend1: srw 0,11,6
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stw 0,4(7)
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blr
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Lend2: srw 0,10,6
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stw 0,4(7)
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blr
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#else
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/* Shift a limb right, low level routine.
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Copyright (C) 1995, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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2005-05-31 08:39:18 +00:00
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write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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2002-06-29 14:15:02 +00:00
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/* INPUT PARAMETERS
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res_ptr r3
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s1_ptr r4
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size r5
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cnt r6 */
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ENTRY(mpihelp_rshift)
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mtctr 5 # copy size into CTR
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addi 7,3,-4 # move adjusted res_ptr to free return reg
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subfic 8,6,32
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lwz 11,0(4) # load first s1 limb
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slw 3,11,8 # compute function return value
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bdz 1f
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0: lwzu 10,4(4)
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srw 9,11,6
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slw 12,10,8
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or 9,9,12
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stwu 9,4(7)
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bdz 2f
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lwzu 11,4(4)
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srw 9,10,6
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slw 12,11,8
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or 9,9,12
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stwu 9,4(7)
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bdnz 0b
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1: srw 0,11,6
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stw 0,4(7)
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blr
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2: srw 0,10,6
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stw 0,4(7)
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blr
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END(mpihelp_rshift)
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#endif
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