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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
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
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 General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://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)
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