125 lines
2.7 KiB
ArmAsm
125 lines
2.7 KiB
ArmAsm
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/* 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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#include <linux/cfi_types.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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* __le64 hash[NH_NUM_PASSES])
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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_TYPED_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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