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C x86_64/ecc-521-modp.asm
ifelse(<
Copyright (C) 2013 Niels Möller
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-521-modp.asm"
GMP_NUMB_BITS(64)
define(<RP>, <%rsi>)
define(<U0>, <%rax>)
define(<U1>, <%rbx>)
define(<U2>, <%rcx>)
define(<U3>, <%rdx>)
define(<U4>, <%rbp>)
define(<U5>, <%rdi>)
define(<U6>, <%r8>)
define(<U7>, <%r9>)
define(<U8>, <%r10>)
define(<U9>, <%r11>)
define(<T0>, <%r12>)
define(<T1>, <%r13>)
PROLOGUE(nettle_ecc_521_modp)
W64_ENTRY(2, 0)
push %rbx
push %rbp
push %r12
push %r13
C Read top 17 limbs, shift left 55 bits
mov 72(RP), U1
mov U1, U0
shl $55, U0
shr $9, U1
mov 80(RP), U2
mov U2, T0
shr $9, U2
shl $55, T0
or T0, U1
mov 88(RP), U3
mov U3, T0
shr $9, U3
shl $55, T0
or T0, U2
mov 96(RP), U4
mov U4, T0
shr $9, U4
shl $55, T0
or T0, U3
mov 104(RP), U5
mov U5, T0
shr $9, U5
shl $55, T0
or T0, U4
mov 112(RP), U6
mov U6, T0
shr $9, U6
shl $55, T0
or T0, U5
mov 120(RP), U7
mov U7, T0
shr $9, U7
shl $55, T0
or T0, U6
mov 128(RP), U8
mov U8, T0
shr $9, U8
shl $55, T0
or T0, U7
mov 136(RP), U9
mov U9, T0
shr $9, U9
shl $55, T0
or T0, U8
add (RP), U0
adc 8(RP), U1
adc 16(RP), U2
adc 24(RP), U3
adc 32(RP), U4
adc 40(RP), U5
adc 48(RP), U6
adc 56(RP), U7
adc 64(RP), U8
adc $0, U9
C Top limbs are <U9, U8>. Keep low 9 bits of 8, and fold the
C top bits (at most 65 bits).
mov U8, T0
shr $9, T0
and $0x1ff, U8
mov U9, T1
shl $55, U9
shr $9, T1
or U9, T0
add T0, U0
mov U0, (RP)
adc T1, U1
mov U1, 8(RP)
adc $0, U2
mov U2, 16(RP)
adc $0, U3
mov U3, 24(RP)
adc $0, U4
mov U4, 32(RP)
adc $0, U5
mov U5, 40(RP)
adc $0, U6
mov U6, 48(RP)
adc $0, U7
mov U7, 56(RP)
adc $0, U8
mov U8, 64(RP)
pop %r13
pop %r12
pop %rbp
pop %rbx
W64_EXIT(2, 0)
ret
EPILOGUE(nettle_ecc_521_modp)
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