lshift.asm
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上传日期:2022-08-06
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- dnl MIPS32 mpn_lshift -- Left shift.
- dnl Copyright 1995, 2000, 2002 Free Software Foundation, Inc.
- dnl This file is part of the GNU MP Library.
- dnl The GNU MP Library is free software; you can redistribute it and/or modify
- dnl it under the terms of the GNU Lesser General Public License as published
- dnl by the Free Software Foundation; either version 3 of the License, or (at
- dnl your option) any later version.
- dnl The GNU MP Library is distributed in the hope that it will be useful, but
- dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- dnl License for more details.
- dnl You should have received a copy of the GNU Lesser General Public License
- dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
- include(`../config.m4')
- C INPUT PARAMETERS
- C res_ptr $4
- C src_ptr $5
- C size $6
- C cnt $7
- ASM_START()
- PROLOGUE(mpn_lshift)
- sll $2,$6,2
- addu $5,$5,$2 C make r5 point at end of src
- lw $10,-4($5) C load first limb
- subu $13,$0,$7
- addu $4,$4,$2 C make r4 point at end of res
- addiu $6,$6,-1
- and $9,$6,4-1 C number of limbs in first loop
- beq $9,$0,.L0 C if multiple of 4 limbs, skip first loop
- srl $2,$10,$13 C compute function result
- subu $6,$6,$9
- .Loop0: lw $3,-8($5)
- addiu $4,$4,-4
- addiu $5,$5,-4
- addiu $9,$9,-1
- sll $11,$10,$7
- srl $12,$3,$13
- move $10,$3
- or $8,$11,$12
- bne $9,$0,.Loop0
- sw $8,0($4)
- .L0: beq $6,$0,.Lend
- nop
- .Loop: lw $3,-8($5)
- addiu $4,$4,-16
- addiu $6,$6,-4
- sll $11,$10,$7
- srl $12,$3,$13
- lw $10,-12($5)
- sll $14,$3,$7
- or $8,$11,$12
- sw $8,12($4)
- srl $9,$10,$13
- lw $3,-16($5)
- sll $11,$10,$7
- or $8,$14,$9
- sw $8,8($4)
- srl $12,$3,$13
- lw $10,-20($5)
- sll $14,$3,$7
- or $8,$11,$12
- sw $8,4($4)
- srl $9,$10,$13
- addiu $5,$5,-16
- or $8,$14,$9
- bgtz $6,.Loop
- sw $8,0($4)
- .Lend: sll $8,$10,$7
- j $31
- sw $8,-4($4)
- EPILOGUE(mpn_lshift)