98 lines
1.9 KiB
ArmAsm
98 lines
1.9 KiB
ArmAsm
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/* MIPS3 __mpn_rshift --
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*
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* Copyright (C) 1995-2022 Free Software Foundation, Inc.
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*
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* This file is part of the GNU MP Library.
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*
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* The GNU MP Library 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 published by
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* the Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version.
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*
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* The GNU MP Library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with the GNU MP Library. If not, see
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* <https://www.gnu.org/licenses/>.
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*/
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#include <sysdep.h>
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#include <sys/asm.h>
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/* INPUT PARAMETERS
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* res_ptr $4
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* src_ptr $5
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* size $6
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* cnt $7
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*/
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#ifdef __PIC__
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.option pic2
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#endif
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ENTRY (__mpn_rshift)
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#ifdef __PIC__
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SETUP_GP /* ??? unused */
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#endif
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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,L(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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L(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,L(Loop0)
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sd $8,-8($4)
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L(L0): beq $6,$0,L(Lend)
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nop
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L(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,L(Loop)
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sd $8,-8($4)
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L(Lend): dsrl $8,$10,$7
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j $31
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sd $8,0($4)
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END (__mpn_rshift)
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