125 lines
2.7 KiB
ArmAsm
125 lines
2.7 KiB
ArmAsm
/* 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>
|
|
#include <linux/cfi_types.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,
|
|
* __le64 hash[NH_NUM_PASSES])
|
|
*
|
|
* It's guaranteed that message_len % 16 == 0.
|
|
*/
|
|
SYM_TYPED_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)
|