132 lines
3.4 KiB
ArmAsm
132 lines
3.4 KiB
ArmAsm
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/* PowerPC-32 rshift
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*
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* Copyright (C) 1995, 1998, 2002 Free Software Foundation, Inc.
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*
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* This file is part of Libgcrypt.
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*
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* Libgcrypt is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* Libgcrypt 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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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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* _gcry_mpih_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 _gcry_mpih_rshift
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.globl ._gcry_mpih_rshift
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.csect _gcry_mpih_rshift[DS]
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_gcry_mpih_rshift:
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.long ._gcry_mpih_rshift, TOC[tc0], 0
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.csect .text[PR]
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._gcry_mpih_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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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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(_gcry_mpih_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(_gcry_mpih_rshift)
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#endif
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