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