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C powerpc/ecc-curve448-modp.asm
ifelse(`
Copyright (C) 2021 Martin Schwenke & Amitay Isaacs, IBM Corporation
Based on x86_64/ecc-curve448-modp.asm
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
GNU Nettle is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see http://www.gnu.org/licenses/.
')
.file "ecc-curve448-modp.asm"
define(`SP', `r1')
define(`RP', `r4')
define(`XP', `r5')
define(`X0', `r3')
define(`X1', `r9')
define(`X2', `r10')
define(`X3', `r11')
define(`X4', `r12')
define(`X5', `r14')
define(`X6', `r15')
define(`X7', `r16')
define(`T0', `r6')
define(`T1', `r7')
define(`T2', `r8')
define(`TT', `r17')
define(`LO', `TT') C Overlap
C void ecc_curve448_modp (const struct ecc_modulo *p, mp_limb_t *rp, mp_limb_t *xp)
.text
define(`FUNC_ALIGN', `5')
PROLOGUE(_nettle_ecc_curve448_modp)
std r14, -32(SP)
std r15, -24(SP)
std r16, -16(SP)
std r17, -8(SP)
C First load the values to be shifted by 32.
ld T0, 88(XP) C use for X0, X1
ld T1, 96(XP) C use for X2
ld T2, 104(XP) C use for X3
ld X4, 56(XP)
ld X5, 64(XP)
ld X6, 72(XP)
ld X7, 80(XP)
C Multiply by 2^32
sldi X0, T0, 32
srdi LO, T0, 32
sldi X1, T1, 32
or X1, X1, LO
srdi LO, T1, 32
sldi X2, T2, 32
or X2, X2, LO
srdi LO, T2, 32
sldi X3, X4, 32
or X3, X3, LO
srdi LO, X4, 32
sldi X4, X5, 32
or X4, X4, LO
srdi LO, X5, 32
sldi X5, X6, 32
or X5, X5, LO
srdi LO, X6, 32
sldi X6, X7, 32
or X6, X6, LO
srdi X7, X7, 32
C Multiply by 2
addc T0, T0, T0
adde T1, T1, T1
adde T2, T2, T2
addze X7, X7
C Main additions
ld TT, 56(XP)
addc X0, TT, X0
ld TT, 64(XP)
adde X1, TT, X1
ld TT, 72(XP)
adde X2, TT, X2
ld TT, 80(XP)
adde X3, TT, X3
adde X4, T0, X4
adde X5, T1, X5
adde X6, T2, X6
addze X7, X7
ld T0, 0(XP)
addc X0, T0, X0
ld T1, 8(XP)
adde X1, T1, X1
ld T2, 16(XP)
adde X2, T2, X2
ld TT, 24(XP)
adde X3, TT, X3
ld T0, 32(XP)
adde X4, T0, X4
ld T1, 40(XP)
adde X5, T1, X5
ld T2, 48(XP)
adde X6, T2, X6
addze X7, X7
C X7 wraparound
sldi T0, X7, 32
srdi T1, X7, 32
li T2, 0
addc X0, X7, X0
addze X1, X1
addze X2, X2
adde X3, T0, X3
adde X4, T1, X4
addze X5, X5
addze X6, X6
addze T2, T2
C Final carry wraparound. Carry T2 > 0 only if
C X6 is zero, so carry is absorbed.
sldi T0, T2, 32
addc X0, T2, X0
addze X1, X1
addze X2, X2
adde X3, T0, X3
addze X4, X4
addze X5, X5
addze X6, X6
std X0, 0(RP)
std X1, 8(RP)
std X2, 16(RP)
std X3, 24(RP)
std X4, 32(RP)
std X5, 40(RP)
std X6, 48(RP)
ld r14, -32(SP)
ld r15, -24(SP)
ld r16, -16(SP)
ld r17, -8(SP)
blr
EPILOGUE(_nettle_ecc_curve448_modp)
|
