88 lines
1.9 KiB
NASM
88 lines
1.9 KiB
NASM
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dnl MIPS32 mpn_rshift -- Right shift.
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dnl Copyright 1995, 2000, 2002 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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dnl The GNU MP Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write
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dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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dnl Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C INPUT PARAMETERS
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C res_ptr $4
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C src_ptr $5
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C size $6
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C cnt $7
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ASM_START()
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PROLOGUE(mpn_rshift)
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lw $10,0($5) C load first limb
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subu $13,$0,$7
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addiu $6,$6,-1
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and $9,$6,4-1 C number of limbs in first loop
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beq $9,$0,.L0 C if multiple of 4 limbs, skip first loop
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sll $2,$10,$13 C compute function result
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subu $6,$6,$9
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.Loop0: lw $3,4($5)
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addiu $4,$4,4
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addiu $5,$5,4
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addiu $9,$9,-1
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srl $11,$10,$7
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sll $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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sw $8,-4($4)
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.L0: beq $6,$0,.Lend
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nop
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.Loop: lw $3,4($5)
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addiu $4,$4,16
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addiu $6,$6,-4
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srl $11,$10,$7
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sll $12,$3,$13
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lw $10,8($5)
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srl $14,$3,$7
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or $8,$11,$12
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sw $8,-16($4)
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sll $9,$10,$13
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lw $3,12($5)
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srl $11,$10,$7
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or $8,$14,$9
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sw $8,-12($4)
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sll $12,$3,$13
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lw $10,16($5)
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srl $14,$3,$7
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or $8,$11,$12
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sw $8,-8($4)
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sll $9,$10,$13
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addiu $5,$5,16
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or $8,$14,$9
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bgtz $6,.Loop
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sw $8,-4($4)
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.Lend: srl $8,$10,$7
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j $31
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sw $8,0($4)
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EPILOGUE(mpn_rshift)
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