96 lines
2 KiB
ArmAsm
96 lines
2 KiB
ArmAsm
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/* mips3 rshift
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*
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* Copyright (C) 1995, 1998, 2000
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* 2001, 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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/*******************
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* mpi_limb_t
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* _gcry_mpih_rshift( mpi_ptr_t wp, ($4)
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* mpi_ptr_t up, ($5)
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* mpi_size_t usize, ($6)
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* unsigned cnt) ($7)
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*/
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.text
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.align 2
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.globl _gcry_mpih_rshift
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.ent _gcry_mpih_rshift
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_gcry_mpih_rshift:
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.set noreorder
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.set nomacro
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ld $10,0($5) # load first limb
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dsubu $13,$0,$7
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daddiu $6,$6,-1
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and $9,$6,4-1 # number of limbs in first loop
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beq $9,$0,.L0 # if multiple of 4 limbs, skip first loop
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dsll $2,$10,$13 # compute function result
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dsubu $6,$6,$9
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.Loop0: ld $3,8($5)
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daddiu $4,$4,8
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daddiu $5,$5,8
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daddiu $9,$9,-1
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dsrl $11,$10,$7
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dsll $12,$3,$13
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move $10,$3
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or $8,$11,$12
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bne $9,$0,.Loop0
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sd $8,-8($4)
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.L0: beq $6,$0,.Lend
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nop
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.Loop: ld $3,8($5)
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daddiu $4,$4,32
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daddiu $6,$6,-4
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dsrl $11,$10,$7
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dsll $12,$3,$13
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ld $10,16($5)
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dsrl $14,$3,$7
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or $8,$11,$12
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sd $8,-32($4)
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dsll $9,$10,$13
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ld $3,24($5)
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dsrl $11,$10,$7
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or $8,$14,$9
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sd $8,-24($4)
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dsll $12,$3,$13
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ld $10,32($5)
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dsrl $14,$3,$7
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or $8,$11,$12
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sd $8,-16($4)
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dsll $9,$10,$13
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daddiu $5,$5,32
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or $8,$14,$9
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bgtz $6,.Loop
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sd $8,-8($4)
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.Lend: dsrl $8,$10,$7
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j $31
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sd $8,0($4)
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.end _gcry_mpih_rshift
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