2002-06-29 16:15:02 +02:00
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/* mips3 lshift
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*
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* Copyright (C) 1995, 1998, 2000,
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* 2001 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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2007-10-23 12:48:09 +02:00
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* the Free Software Foundation; either version 3 of the License, or
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2002-06-29 16:15:02 +02:00
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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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2007-10-23 12:48:09 +02:00
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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2002-06-29 16:15:02 +02:00
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*/
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/*******************
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* mpi_limb_t
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* mpihelp_lshift( 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 mpihelp_lshift
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.ent mpihelp_lshift
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mpihelp_lshift:
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.set noreorder
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.set nomacro
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dsll $2,$6,3
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daddu $5,$5,$2 # make r5 point at end of src
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ld $10,-8($5) # load first limb
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dsubu $13,$0,$7
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daddu $4,$4,$2 # make r4 point at end of res
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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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dsrl $2,$10,$13 # compute function result
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dsubu $6,$6,$9
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.Loop0: ld $3,-16($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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dsll $11,$10,$7
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dsrl $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 $8,0($4)
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.L0: beq $6,$0,.Lend
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nop
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.Loop: ld $3,-16($5)
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daddiu $4,$4,-32
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daddiu $6,$6,-4
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dsll $11,$10,$7
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dsrl $12,$3,$13
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ld $10,-24($5)
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dsll $14,$3,$7
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or $8,$11,$12
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sd $8,24($4)
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dsrl $9,$10,$13
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ld $3,-32($5)
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dsll $11,$10,$7
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or $8,$14,$9
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sd $8,16($4)
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dsrl $12,$3,$13
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ld $10,-40($5)
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dsll $14,$3,$7
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or $8,$11,$12
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sd $8,8($4)
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dsrl $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 $8,0($4)
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.Lend: dsll $8,$10,$7
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j $31
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sd $8,-8($4)
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.end mpihelp_lshift
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