submul_1.asm
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上传日期:2022-08-06
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- dnl MIPS32 mpn_submul_1 -- Multiply a limb vector with a single limb and
- dnl subtract the product from a second limb vector.
- dnl Copyright 1992, 1994, 1996, 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 s1_ptr $5
- C size $6
- C s2_limb $7
- ASM_START()
- PROLOGUE(mpn_submul_1)
- C feed-in phase 0
- lw $8,0($5)
- C feed-in phase 1
- addiu $5,$5,4
- multu $8,$7
- addiu $6,$6,-1
- beq $6,$0,$LC0
- move $2,$0 C zero cy2
- addiu $6,$6,-1
- beq $6,$0,$LC1
- lw $8,0($5) C load new s1 limb as early as possible
- Loop: lw $10,0($4)
- mflo $3
- mfhi $9
- addiu $5,$5,4
- addu $3,$3,$2 C add old carry limb to low product limb
- multu $8,$7
- lw $8,0($5) C load new s1 limb as early as possible
- addiu $6,$6,-1 C decrement loop counter
- sltu $2,$3,$2 C carry from previous addition -> $2
- subu $3,$10,$3
- sgtu $10,$3,$10
- addu $2,$2,$10
- sw $3,0($4)
- addiu $4,$4,4
- bne $6,$0,Loop
- addu $2,$9,$2 C add high product limb and carry from addition
- C wind-down phase 1
- $LC1: lw $10,0($4)
- mflo $3
- mfhi $9
- addu $3,$3,$2
- sltu $2,$3,$2
- multu $8,$7
- subu $3,$10,$3
- sgtu $10,$3,$10
- addu $2,$2,$10
- sw $3,0($4)
- addiu $4,$4,4
- addu $2,$9,$2 C add high product limb and carry from addition
- C wind-down phase 0
- $LC0: lw $10,0($4)
- mflo $3
- mfhi $9
- addu $3,$3,$2
- sltu $2,$3,$2
- subu $3,$10,$3
- sgtu $10,$3,$10
- addu $2,$2,$10
- sw $3,0($4)
- j $31
- addu $2,$9,$2 C add high product limb and carry from addition
- EPILOGUE(mpn_submul_1)