158 lines
3.7 KiB
ArmAsm
158 lines
3.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* NH - ε-almost-universal hash function, x86_64 AVX2 accelerated
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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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#define PASS0_SUMS %ymm0
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#define PASS1_SUMS %ymm1
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#define PASS2_SUMS %ymm2
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#define PASS3_SUMS %ymm3
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#define K0 %ymm4
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#define K0_XMM %xmm4
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#define K1 %ymm5
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#define K1_XMM %xmm5
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#define K2 %ymm6
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#define K2_XMM %xmm6
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#define K3 %ymm7
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#define K3_XMM %xmm7
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#define T0 %ymm8
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#define T1 %ymm9
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#define T2 %ymm10
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#define T2_XMM %xmm10
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#define T3 %ymm11
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#define T3_XMM %xmm11
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#define T4 %ymm12
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#define T5 %ymm13
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#define T6 %ymm14
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#define T7 %ymm15
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#define KEY %rdi
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#define MESSAGE %rsi
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#define MESSAGE_LEN %rdx
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#define HASH %rcx
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.macro _nh_2xstride k0, k1, k2, k3
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// Add message words to key words
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vpaddd \k0, T3, T0
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vpaddd \k1, T3, T1
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vpaddd \k2, T3, T2
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vpaddd \k3, T3, T3
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// Multiply 32x32 => 64 and accumulate
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vpshufd $0x10, T0, T4
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vpshufd $0x32, T0, T0
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vpshufd $0x10, T1, T5
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vpshufd $0x32, T1, T1
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vpshufd $0x10, T2, T6
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vpshufd $0x32, T2, T2
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vpshufd $0x10, T3, T7
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vpshufd $0x32, T3, T3
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vpmuludq T4, T0, T0
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vpmuludq T5, T1, T1
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vpmuludq T6, T2, T2
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vpmuludq T7, T3, T3
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vpaddq T0, PASS0_SUMS, PASS0_SUMS
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vpaddq T1, PASS1_SUMS, PASS1_SUMS
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vpaddq T2, PASS2_SUMS, PASS2_SUMS
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vpaddq T3, PASS3_SUMS, PASS3_SUMS
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.endm
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/*
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* void nh_avx2(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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SYM_FUNC_START(nh_avx2)
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vmovdqu 0x00(KEY), K0
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vmovdqu 0x10(KEY), K1
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add $0x20, KEY
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vpxor PASS0_SUMS, PASS0_SUMS, PASS0_SUMS
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vpxor PASS1_SUMS, PASS1_SUMS, PASS1_SUMS
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vpxor PASS2_SUMS, PASS2_SUMS, PASS2_SUMS
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vpxor PASS3_SUMS, PASS3_SUMS, PASS3_SUMS
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sub $0x40, MESSAGE_LEN
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jl .Lloop4_done
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.Lloop4:
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vmovdqu (MESSAGE), T3
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vmovdqu 0x00(KEY), K2
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vmovdqu 0x10(KEY), K3
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_nh_2xstride K0, K1, K2, K3
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vmovdqu 0x20(MESSAGE), T3
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vmovdqu 0x20(KEY), K0
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vmovdqu 0x30(KEY), K1
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_nh_2xstride K2, K3, K0, K1
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add $0x40, MESSAGE
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add $0x40, KEY
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sub $0x40, MESSAGE_LEN
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jge .Lloop4
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.Lloop4_done:
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and $0x3f, MESSAGE_LEN
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jz .Ldone
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cmp $0x20, MESSAGE_LEN
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jl .Llast
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// 2 or 3 strides remain; do 2 more.
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vmovdqu (MESSAGE), T3
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vmovdqu 0x00(KEY), K2
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vmovdqu 0x10(KEY), K3
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_nh_2xstride K0, K1, K2, K3
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add $0x20, MESSAGE
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add $0x20, KEY
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sub $0x20, MESSAGE_LEN
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jz .Ldone
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vmovdqa K2, K0
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vmovdqa K3, K1
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.Llast:
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// Last stride. Zero the high 128 bits of the message and keys so they
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// don't affect the result when processing them like 2 strides.
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vmovdqu (MESSAGE), T3_XMM
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vmovdqa K0_XMM, K0_XMM
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vmovdqa K1_XMM, K1_XMM
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vmovdqu 0x00(KEY), K2_XMM
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vmovdqu 0x10(KEY), K3_XMM
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_nh_2xstride K0, K1, K2, K3
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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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// PASS0_SUMS is (0A 0B 0C 0D)
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// PASS1_SUMS is (1A 1B 1C 1D)
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// PASS2_SUMS is (2A 2B 2C 2D)
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// PASS3_SUMS is (3A 3B 3C 3D)
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// We need the horizontal sums:
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// (0A + 0B + 0C + 0D,
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// 1A + 1B + 1C + 1D,
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// 2A + 2B + 2C + 2D,
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// 3A + 3B + 3C + 3D)
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//
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vpunpcklqdq PASS1_SUMS, PASS0_SUMS, T0 // T0 = (0A 1A 0C 1C)
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vpunpckhqdq PASS1_SUMS, PASS0_SUMS, T1 // T1 = (0B 1B 0D 1D)
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vpunpcklqdq PASS3_SUMS, PASS2_SUMS, T2 // T2 = (2A 3A 2C 3C)
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vpunpckhqdq PASS3_SUMS, PASS2_SUMS, T3 // T3 = (2B 3B 2D 3D)
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vinserti128 $0x1, T2_XMM, T0, T4 // T4 = (0A 1A 2A 3A)
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vinserti128 $0x1, T3_XMM, T1, T5 // T5 = (0B 1B 2B 3B)
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vperm2i128 $0x31, T2, T0, T0 // T0 = (0C 1C 2C 3C)
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vperm2i128 $0x31, T3, T1, T1 // T1 = (0D 1D 2D 3D)
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vpaddq T5, T4, T4
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vpaddq T1, T0, T0
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vpaddq T4, T0, T0
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vmovdqu T0, (HASH)
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RET
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SYM_FUNC_END(nh_avx2)
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