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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 | /* SPDX-License-Identifier: GPL-2.0 */ /* * NH - ε-almost-universal hash function, x86_64 SSE2 accelerated * * Copyright 2018 Google LLC * * Author: Eric Biggers <ebiggers@google.com> */ #include <linux/linkage.h> #define PASS0_SUMS %xmm0 #define PASS1_SUMS %xmm1 #define PASS2_SUMS %xmm2 #define PASS3_SUMS %xmm3 #define K0 %xmm4 #define K1 %xmm5 #define K2 %xmm6 #define K3 %xmm7 #define T0 %xmm8 #define T1 %xmm9 #define T2 %xmm10 #define T3 %xmm11 #define T4 %xmm12 #define T5 %xmm13 #define T6 %xmm14 #define T7 %xmm15 #define KEY %rdi #define MESSAGE %rsi #define MESSAGE_LEN %rdx #define HASH %rcx .macro _nh_stride k0, k1, k2, k3, offset // Load next message stride movdqu \offset(MESSAGE), T1 // Load next key stride movdqu \offset(KEY), \k3 // Add message words to key words movdqa T1, T2 movdqa T1, T3 paddd T1, \k0 // reuse k0 to avoid a move paddd \k1, T1 paddd \k2, T2 paddd \k3, T3 // Multiply 32x32 => 64 and accumulate pshufd $0x10, \k0, T4 pshufd $0x32, \k0, \k0 pshufd $0x10, T1, T5 pshufd $0x32, T1, T1 pshufd $0x10, T2, T6 pshufd $0x32, T2, T2 pshufd $0x10, T3, T7 pshufd $0x32, T3, T3 pmuludq T4, \k0 pmuludq T5, T1 pmuludq T6, T2 pmuludq T7, T3 paddq \k0, PASS0_SUMS paddq T1, PASS1_SUMS paddq T2, PASS2_SUMS paddq T3, PASS3_SUMS .endm /* * void nh_sse2(const u32 *key, const u8 *message, size_t message_len, * u8 hash[NH_HASH_BYTES]) * * It's guaranteed that message_len % 16 == 0. */ SYM_FUNC_START(nh_sse2) movdqu 0x00(KEY), K0 movdqu 0x10(KEY), K1 movdqu 0x20(KEY), K2 add $0x30, KEY pxor PASS0_SUMS, PASS0_SUMS pxor PASS1_SUMS, PASS1_SUMS pxor PASS2_SUMS, PASS2_SUMS pxor PASS3_SUMS, PASS3_SUMS sub $0x40, MESSAGE_LEN jl .Lloop4_done .Lloop4: _nh_stride K0, K1, K2, K3, 0x00 _nh_stride K1, K2, K3, K0, 0x10 _nh_stride K2, K3, K0, K1, 0x20 _nh_stride K3, K0, K1, K2, 0x30 add $0x40, KEY add $0x40, MESSAGE sub $0x40, MESSAGE_LEN jge .Lloop4 .Lloop4_done: and $0x3f, MESSAGE_LEN jz .Ldone _nh_stride K0, K1, K2, K3, 0x00 sub $0x10, MESSAGE_LEN jz .Ldone _nh_stride K1, K2, K3, K0, 0x10 sub $0x10, MESSAGE_LEN jz .Ldone _nh_stride K2, K3, K0, K1, 0x20 .Ldone: // Sum the accumulators for each pass, then store the sums to 'hash' movdqa PASS0_SUMS, T0 movdqa PASS2_SUMS, T1 punpcklqdq PASS1_SUMS, T0 // => (PASS0_SUM_A PASS1_SUM_A) punpcklqdq PASS3_SUMS, T1 // => (PASS2_SUM_A PASS3_SUM_A) punpckhqdq PASS1_SUMS, PASS0_SUMS // => (PASS0_SUM_B PASS1_SUM_B) punpckhqdq PASS3_SUMS, PASS2_SUMS // => (PASS2_SUM_B PASS3_SUM_B) paddq PASS0_SUMS, T0 paddq PASS2_SUMS, T1 movdqu T0, 0x00(HASH) movdqu T1, 0x10(HASH) RET SYM_FUNC_END(nh_sse2) |