104 строки
2.1 KiB
ArmAsm
104 строки
2.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* NH - ε-almost-universal hash function, ARM64 NEON accelerated version
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*
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* Copyright 2018 Google LLC
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*
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* Author: Eric Biggers <ebiggers@google.com>
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*/
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#include <linux/linkage.h>
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KEY .req x0
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MESSAGE .req x1
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MESSAGE_LEN .req x2
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HASH .req x3
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PASS0_SUMS .req v0
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PASS1_SUMS .req v1
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PASS2_SUMS .req v2
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PASS3_SUMS .req v3
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K0 .req v4
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K1 .req v5
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K2 .req v6
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K3 .req v7
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T0 .req v8
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T1 .req v9
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T2 .req v10
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T3 .req v11
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T4 .req v12
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T5 .req v13
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T6 .req v14
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T7 .req v15
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.macro _nh_stride k0, k1, k2, k3
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// Load next message stride
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ld1 {T3.16b}, [MESSAGE], #16
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// Load next key stride
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ld1 {\k3\().4s}, [KEY], #16
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// Add message words to key words
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add T0.4s, T3.4s, \k0\().4s
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add T1.4s, T3.4s, \k1\().4s
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add T2.4s, T3.4s, \k2\().4s
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add T3.4s, T3.4s, \k3\().4s
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// Multiply 32x32 => 64 and accumulate
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mov T4.d[0], T0.d[1]
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mov T5.d[0], T1.d[1]
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mov T6.d[0], T2.d[1]
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mov T7.d[0], T3.d[1]
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umlal PASS0_SUMS.2d, T0.2s, T4.2s
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umlal PASS1_SUMS.2d, T1.2s, T5.2s
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umlal PASS2_SUMS.2d, T2.2s, T6.2s
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umlal PASS3_SUMS.2d, T3.2s, T7.2s
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.endm
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/*
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* void nh_neon(const u32 *key, const u8 *message, size_t message_len,
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* u8 hash[NH_HASH_BYTES])
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*
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* It's guaranteed that message_len % 16 == 0.
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*/
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ENTRY(nh_neon)
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ld1 {K0.4s,K1.4s}, [KEY], #32
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movi PASS0_SUMS.2d, #0
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movi PASS1_SUMS.2d, #0
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ld1 {K2.4s}, [KEY], #16
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movi PASS2_SUMS.2d, #0
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movi PASS3_SUMS.2d, #0
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subs MESSAGE_LEN, MESSAGE_LEN, #64
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blt .Lloop4_done
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.Lloop4:
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_nh_stride K0, K1, K2, K3
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_nh_stride K1, K2, K3, K0
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_nh_stride K2, K3, K0, K1
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_nh_stride K3, K0, K1, K2
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subs MESSAGE_LEN, MESSAGE_LEN, #64
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bge .Lloop4
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.Lloop4_done:
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ands MESSAGE_LEN, MESSAGE_LEN, #63
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beq .Ldone
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_nh_stride K0, K1, K2, K3
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subs MESSAGE_LEN, MESSAGE_LEN, #16
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beq .Ldone
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_nh_stride K1, K2, K3, K0
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subs MESSAGE_LEN, MESSAGE_LEN, #16
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beq .Ldone
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_nh_stride K2, K3, K0, K1
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.Ldone:
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// Sum the accumulators for each pass, then store the sums to 'hash'
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addp T0.2d, PASS0_SUMS.2d, PASS1_SUMS.2d
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addp T1.2d, PASS2_SUMS.2d, PASS3_SUMS.2d
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st1 {T0.16b,T1.16b}, [HASH]
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ret
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ENDPROC(nh_neon)
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