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ntt_kyber_123_4567.s
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///
/// Copyright (c) 2022 Arm Limited
/// Copyright (c) 2022 Hanno Becker
/// Copyright (c) 2023 Amin Abdulrahman, Matthias Kannwischer
/// SPDX-License-Identifier: MIT
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in all
/// copies or substantial portions of the Software.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
/// SOFTWARE.
///
// Commented out for simple standalone emulation not
// requiring correct constant data
//
// Should be commented when used.
//
// Needed to provide ASM_LOAD directive
// #include <hal_envh>
.macro mulmodq dst, src, const, idx0, idx1
sqrdmulh t2.8h, \src\().8h, \const\().h[\idx1]
mul \dst\().8h, \src\().8h, \const\().h[\idx0]
mls \dst\().8h, t2.8h, consts.h[0]
.endm
.macro mulmod dst, src, const, const_twisted
sqrdmulh t2.8h, \src\().8h, \const_twisted\().8h
mul \dst\().8h, \src\().8h, \const\().8h
mls \dst\().8h, t2.8h, consts.h[0]
.endm
.macro ct_butterfly a, b, root, idx0, idx1
mulmodq tmp, \b, \root, \idx0, \idx1
sub \b\().8h, \a\().8h, tmp.8h
add \a\().8h, \a\().8h, tmp.8h
.endm
.macro ct_butterfly_v a, b, root, root_twisted
mulmod tmp, \b, \root, \root_twisted
sub \b\().8h, \a\().8h, tmp.8h
add \a\().8h, \a\().8h, tmp.8h
.endm
.macro barrett_reduce a
sqdmulh t0.8h, \a\().8h, consts.h[1]
srshr t0.8h, t0.8h, #11
mls \a\().8h, t0.8h, consts.h[0]
.endm
.macro load_roots_123
ldr q_root0, [r_ptr0], #32
ldr q_root1, [r_ptr0, #-16]
.endm
.macro load_next_roots_45
ldr q_root0, [r_ptr0], #16
.endm
.macro load_next_roots_67
ldr q_root0, [r_ptr1], #(6*16)
ldr q_root0_tw, [r_ptr1, #(-6*16 + 1*16)]
ldr q_root1, [r_ptr1, #(-6*16 + 2*16)]
ldr q_root1_tw, [r_ptr1, #(-6*16 + 3*16)]
ldr q_root2, [r_ptr1, #(-6*16 + 4*16)]
ldr q_root2_tw, [r_ptr1, #(-6*16 + 5*16)]
.endm
.macro transpose4 data
trn1 t0.4s, \data\()0.4s, \data\()1.4s
trn2 t1.4s, \data\()0.4s, \data\()1.4s
trn1 t2.4s, \data\()2.4s, \data\()3.4s
trn2 t3.4s, \data\()2.4s, \data\()3.4s
trn2 \data\()2.2d, t0.2d, t2.2d
trn2 \data\()3.2d, t1.2d, t3.2d
trn1 \data\()0.2d, t0.2d, t2.2d
trn1 \data\()1.2d, t1.2d, t3.2d
.endm
.macro transpose_single data_out, data_in
trn1 \data_out\()0.4s, \data_in\()0.4s, \data_in\()1.4s
trn2 \data_out\()1.4s, \data_in\()0.4s, \data_in\()1.4s
trn1 \data_out\()2.4s, \data_in\()2.4s, \data_in\()3.4s
trn2 \data_out\()3.4s, \data_in\()2.4s, \data_in\()3.4s
.endm
.macro save_gprs
sub sp, sp, #(16*6)
stp x19, x20, [sp, #16*0]
stp x19, x20, [sp, #16*0]
stp x21, x22, [sp, #16*1]
stp x23, x24, [sp, #16*2]
stp x25, x26, [sp, #16*3]
stp x27, x28, [sp, #16*4]
str x29, [sp, #16*5]
.endm
.macro restore_gprs
ldp x19, x20, [sp, #16*0]
ldp x21, x22, [sp, #16*1]
ldp x23, x24, [sp, #16*2]
ldp x25, x26, [sp, #16*3]
ldp x27, x28, [sp, #16*4]
ldr x29, [sp, #16*5]
add sp, sp, #(16*6)
.endm
.macro save_vregs
sub sp, sp, #(16*4)
stp d8, d9, [sp, #16*0]
stp d10, d11, [sp, #16*1]
stp d12, d13, [sp, #16*2]
stp d14, d15, [sp, #16*3]
.endm
.macro restore_vregs
ldp d8, d9, [sp, #16*0]
ldp d10, d11, [sp, #16*1]
ldp d12, d13, [sp, #16*2]
ldp d14, d15, [sp, #16*3]
add sp, sp, #(16*4)
.endm
#define STACK_SIZE 16
#define STACK0 0
.macro restore a, loc
ldr \a, [sp, #\loc]
.endm
.macro save loc, a
str \a, [sp, #\loc]
.endm
.macro push_stack
save_gprs
save_vregs
sub sp, sp, #STACK_SIZE
.endm
.macro pop_stack
add sp, sp, #STACK_SIZE
restore_vregs
restore_gprs
.endm
.data
.p2align 4
roots:
// Commented out for simple standalone emulation not
// requiring correct constant data
//
// Should be commented when used.
//
// #include "ntt_kyber_123_45_67_twiddles.s"
in .req x0
inp .req x1
count .req x2
r_ptr0 .req x3
r_ptr1 .req x4
xtmp .req x5
data0 .req v8
data1 .req v9
data2 .req v10
data3 .req v11
data4 .req v12
data5 .req v13
data6 .req v14
data7 .req v15
q_data0 .req q8
q_data1 .req q9
q_data2 .req q10
q_data3 .req q11
q_data4 .req q12
q_data5 .req q13
q_data6 .req q14
q_data7 .req q15
root0 .req v0
root1 .req v1
root2 .req v2
root0_tw .req v4
root1_tw .req v5
root2_tw .req v6
q_root0 .req q0
q_root1 .req q1
q_root2 .req q2
q_root0_tw .req q4
q_root1_tw .req q5
q_root2_tw .req q6
consts .req v7
q_consts .req q7
tmp .req v24
t0 .req v25
t1 .req v26
t2 .req v27
t3 .req v28
.text
.global ntt_kyber_123_4567
.global _ntt_kyber_123_4567
.p2align 4
const_addr:
.short 3329
.short 20159
.short 0
.short 0
.short 0
.short 0
.short 0
.short 0
ntt_kyber_123_4567:
_ntt_kyber_123_4567:
push_stack
// Commented out for simple standalone emulation not
// requiring correct constant data.
//
// Should be commented when used.
//
// ASM_LOAD(r_ptr0, roots)
// ASM_LOAD(r_ptr1, roots_l56)
// ASM_LOAD(xtmp, const_addr)
ld1 {consts.8h}, [xtmp]
str in, [sp, #STACK0] // @slothy:writes=STACK0
mov count, #4
load_roots_123
.p2align 2
layer123_start:
ldr q_data0, [in, #0]
ldr q_data1, [in, #(1*(512/8))]
ldr q_data2, [in, #(2*(512/8))]
ldr q_data3, [in, #(3*(512/8))]
ldr q_data4, [in, #(4*(512/8))]
ldr q_data5, [in, #(5*(512/8))]
ldr q_data6, [in, #(6*(512/8))]
ldr q_data7, [in, #(7*(512/8))]
ct_butterfly data0, data4, root0, 0, 1
ct_butterfly data1, data5, root0, 0, 1
ct_butterfly data2, data6, root0, 0, 1
ct_butterfly data3, data7, root0, 0, 1
ct_butterfly data0, data2, root0, 2, 3
ct_butterfly data1, data3, root0, 2, 3
ct_butterfly data4, data6, root0, 4, 5
ct_butterfly data5, data7, root0, 4, 5
ct_butterfly data0, data1, root0, 6, 7
ct_butterfly data2, data3, root1, 0, 1
ct_butterfly data4, data5, root1, 2, 3
ct_butterfly data6, data7, root1, 4, 5
str q_data0, [in], #(16)
str q_data1, [in, #(-16 + 1*(512/8))]
str q_data2, [in, #(-16 + 2*(512/8))]
str q_data3, [in, #(-16 + 3*(512/8))]
str q_data4, [in, #(-16 + 4*(512/8))]
str q_data5, [in, #(-16 + 5*(512/8))]
str q_data6, [in, #(-16 + 6*(512/8))]
str q_data7, [in, #(-16 + 7*(512/8))]
subs count, count, #1
cbnz count, layer123_start
ldr inp, [sp, #STACK0] // @slothy:reads=STACK0
mov count, #8
.p2align 2
layer4567_start:
ldr q_data0, [inp, #(16*0)]
ldr q_data1, [inp, #(16*1)]
ldr q_data2, [inp, #(16*2)]
ldr q_data3, [inp, #(16*3)]
load_next_roots_45
ct_butterfly data0, data2, root0, 0, 1
ct_butterfly data1, data3, root0, 0, 1
ct_butterfly data0, data1, root0, 2, 3
ct_butterfly data2, data3, root0, 4, 5
transpose4 data
load_next_roots_67
ct_butterfly_v data0, data2, root0, root0_tw
ct_butterfly_v data1, data3, root0, root0_tw
ct_butterfly_v data0, data1, root1, root1_tw
ct_butterfly_v data2, data3, root2, root2_tw
barrett_reduce data0
barrett_reduce data1
barrett_reduce data2
barrett_reduce data3
st4 {data0.4S, data1.4S, data2.4S, data3.4S}, [inp], #64
subs count, count, #1
cbnz count, layer4567_start
pop_stack
ret