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123 lines
2.7 KiB
123 lines
2.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* NH - ε-almost-universal hash function, x86_64 SSE2 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 %xmm0 |
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#define PASS1_SUMS %xmm1 |
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#define PASS2_SUMS %xmm2 |
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#define PASS3_SUMS %xmm3 |
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#define K0 %xmm4 |
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#define K1 %xmm5 |
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#define K2 %xmm6 |
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#define K3 %xmm7 |
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#define T0 %xmm8 |
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#define T1 %xmm9 |
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#define T2 %xmm10 |
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#define T3 %xmm11 |
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#define T4 %xmm12 |
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#define T5 %xmm13 |
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#define T6 %xmm14 |
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#define T7 %xmm15 |
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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_stride k0, k1, k2, k3, offset |
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// Load next message stride |
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movdqu \offset(MESSAGE), T1 |
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// Load next key stride |
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movdqu \offset(KEY), \k3 |
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// Add message words to key words |
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movdqa T1, T2 |
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movdqa T1, T3 |
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paddd T1, \k0 // reuse k0 to avoid a move |
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paddd \k1, T1 |
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paddd \k2, T2 |
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paddd \k3, T3 |
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// Multiply 32x32 => 64 and accumulate |
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pshufd $0x10, \k0, T4 |
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pshufd $0x32, \k0, \k0 |
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pshufd $0x10, T1, T5 |
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pshufd $0x32, T1, T1 |
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pshufd $0x10, T2, T6 |
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pshufd $0x32, T2, T2 |
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pshufd $0x10, T3, T7 |
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pshufd $0x32, T3, T3 |
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pmuludq T4, \k0 |
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pmuludq T5, T1 |
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pmuludq T6, T2 |
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pmuludq T7, T3 |
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paddq \k0, PASS0_SUMS |
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paddq T1, PASS1_SUMS |
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paddq T2, PASS2_SUMS |
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paddq T3, PASS3_SUMS |
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.endm |
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/* |
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* void nh_sse2(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_sse2) |
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movdqu 0x00(KEY), K0 |
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movdqu 0x10(KEY), K1 |
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movdqu 0x20(KEY), K2 |
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add $0x30, KEY |
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pxor PASS0_SUMS, PASS0_SUMS |
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pxor PASS1_SUMS, PASS1_SUMS |
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pxor PASS2_SUMS, PASS2_SUMS |
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pxor 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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_nh_stride K0, K1, K2, K3, 0x00 |
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_nh_stride K1, K2, K3, K0, 0x10 |
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_nh_stride K2, K3, K0, K1, 0x20 |
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_nh_stride K3, K0, K1, K2, 0x30 |
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add $0x40, KEY |
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add $0x40, MESSAGE |
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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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_nh_stride K0, K1, K2, K3, 0x00 |
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sub $0x10, MESSAGE_LEN |
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jz .Ldone |
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_nh_stride K1, K2, K3, K0, 0x10 |
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sub $0x10, MESSAGE_LEN |
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jz .Ldone |
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_nh_stride K2, K3, K0, K1, 0x20 |
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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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movdqa PASS0_SUMS, T0 |
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movdqa PASS2_SUMS, T1 |
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punpcklqdq PASS1_SUMS, T0 // => (PASS0_SUM_A PASS1_SUM_A) |
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punpcklqdq PASS3_SUMS, T1 // => (PASS2_SUM_A PASS3_SUM_A) |
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punpckhqdq PASS1_SUMS, PASS0_SUMS // => (PASS0_SUM_B PASS1_SUM_B) |
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punpckhqdq PASS3_SUMS, PASS2_SUMS // => (PASS2_SUM_B PASS3_SUM_B) |
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paddq PASS0_SUMS, T0 |
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paddq PASS2_SUMS, T1 |
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movdqu T0, 0x00(HASH) |
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movdqu T1, 0x10(HASH) |
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ret |
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SYM_FUNC_END(nh_sse2)
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