mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
116 lines
2.3 KiB
116 lines
2.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
/* |
|
* NH - ε-almost-universal hash function, NEON accelerated version |
|
* |
|
* Copyright 2018 Google LLC |
|
* |
|
* Author: Eric Biggers <ebiggers@google.com> |
|
*/ |
|
|
|
#include <linux/linkage.h> |
|
|
|
.text |
|
.fpu neon |
|
|
|
KEY .req r0 |
|
MESSAGE .req r1 |
|
MESSAGE_LEN .req r2 |
|
HASH .req r3 |
|
|
|
PASS0_SUMS .req q0 |
|
PASS0_SUM_A .req d0 |
|
PASS0_SUM_B .req d1 |
|
PASS1_SUMS .req q1 |
|
PASS1_SUM_A .req d2 |
|
PASS1_SUM_B .req d3 |
|
PASS2_SUMS .req q2 |
|
PASS2_SUM_A .req d4 |
|
PASS2_SUM_B .req d5 |
|
PASS3_SUMS .req q3 |
|
PASS3_SUM_A .req d6 |
|
PASS3_SUM_B .req d7 |
|
K0 .req q4 |
|
K1 .req q5 |
|
K2 .req q6 |
|
K3 .req q7 |
|
T0 .req q8 |
|
T0_L .req d16 |
|
T0_H .req d17 |
|
T1 .req q9 |
|
T1_L .req d18 |
|
T1_H .req d19 |
|
T2 .req q10 |
|
T2_L .req d20 |
|
T2_H .req d21 |
|
T3 .req q11 |
|
T3_L .req d22 |
|
T3_H .req d23 |
|
|
|
.macro _nh_stride k0, k1, k2, k3 |
|
|
|
// Load next message stride |
|
vld1.8 {T3}, [MESSAGE]! |
|
|
|
// Load next key stride |
|
vld1.32 {\k3}, [KEY]! |
|
|
|
// Add message words to key words |
|
vadd.u32 T0, T3, \k0 |
|
vadd.u32 T1, T3, \k1 |
|
vadd.u32 T2, T3, \k2 |
|
vadd.u32 T3, T3, \k3 |
|
|
|
// Multiply 32x32 => 64 and accumulate |
|
vmlal.u32 PASS0_SUMS, T0_L, T0_H |
|
vmlal.u32 PASS1_SUMS, T1_L, T1_H |
|
vmlal.u32 PASS2_SUMS, T2_L, T2_H |
|
vmlal.u32 PASS3_SUMS, T3_L, T3_H |
|
.endm |
|
|
|
/* |
|
* void nh_neon(const u32 *key, const u8 *message, size_t message_len, |
|
* u8 hash[NH_HASH_BYTES]) |
|
* |
|
* It's guaranteed that message_len % 16 == 0. |
|
*/ |
|
ENTRY(nh_neon) |
|
|
|
vld1.32 {K0,K1}, [KEY]! |
|
vmov.u64 PASS0_SUMS, #0 |
|
vmov.u64 PASS1_SUMS, #0 |
|
vld1.32 {K2}, [KEY]! |
|
vmov.u64 PASS2_SUMS, #0 |
|
vmov.u64 PASS3_SUMS, #0 |
|
|
|
subs MESSAGE_LEN, MESSAGE_LEN, #64 |
|
blt .Lloop4_done |
|
.Lloop4: |
|
_nh_stride K0, K1, K2, K3 |
|
_nh_stride K1, K2, K3, K0 |
|
_nh_stride K2, K3, K0, K1 |
|
_nh_stride K3, K0, K1, K2 |
|
subs MESSAGE_LEN, MESSAGE_LEN, #64 |
|
bge .Lloop4 |
|
|
|
.Lloop4_done: |
|
ands MESSAGE_LEN, MESSAGE_LEN, #63 |
|
beq .Ldone |
|
_nh_stride K0, K1, K2, K3 |
|
|
|
subs MESSAGE_LEN, MESSAGE_LEN, #16 |
|
beq .Ldone |
|
_nh_stride K1, K2, K3, K0 |
|
|
|
subs MESSAGE_LEN, MESSAGE_LEN, #16 |
|
beq .Ldone |
|
_nh_stride K2, K3, K0, K1 |
|
|
|
.Ldone: |
|
// Sum the accumulators for each pass, then store the sums to 'hash' |
|
vadd.u64 T0_L, PASS0_SUM_A, PASS0_SUM_B |
|
vadd.u64 T0_H, PASS1_SUM_A, PASS1_SUM_B |
|
vadd.u64 T1_L, PASS2_SUM_A, PASS2_SUM_B |
|
vadd.u64 T1_H, PASS3_SUM_A, PASS3_SUM_B |
|
vst1.8 {T0-T1}, [HASH] |
|
bx lr |
|
ENDPROC(nh_neon)
|
|
|