aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/go/_std_1.21/src/hash/crc32/crc32_arm64.s
blob: 85a113f9de7114522a56bf37c29a6316f5a030a0 (plain) (blame)
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
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

#include "textflag.h"

// castagnoliUpdate updates the non-inverted crc with the given data.

// func castagnoliUpdate(crc uint32, p []byte) uint32
TEXT ·castagnoliUpdate(SB),NOSPLIT,$0-36
	MOVWU	crc+0(FP), R9  // CRC value
	MOVD	p+8(FP), R13  // data pointer
	MOVD	p_len+16(FP), R11  // len(p)

update:
	CMP	$16, R11
	BLT	less_than_16
	LDP.P	16(R13), (R8, R10)
	CRC32CX	R8, R9
	CRC32CX	R10, R9
	SUB	$16, R11

	JMP	update

less_than_16:
	TBZ	$3, R11, less_than_8

	MOVD.P	8(R13), R10
	CRC32CX	R10, R9

less_than_8:
	TBZ	$2, R11, less_than_4

	MOVWU.P	4(R13), R10
	CRC32CW	R10, R9

less_than_4:
	TBZ	$1, R11, less_than_2

	MOVHU.P	2(R13), R10
	CRC32CH	R10, R9

less_than_2:
	TBZ	$0, R11, done

	MOVBU	(R13), R10
	CRC32CB	R10, R9

done:
	MOVWU	R9, ret+32(FP)
	RET

// ieeeUpdate updates the non-inverted crc with the given data.

// func ieeeUpdate(crc uint32, p []byte) uint32
TEXT ·ieeeUpdate(SB),NOSPLIT,$0-36
	MOVWU	crc+0(FP), R9  // CRC value
	MOVD	p+8(FP), R13  // data pointer
	MOVD	p_len+16(FP), R11  // len(p)

update:
	CMP	$16, R11
	BLT	less_than_16
	LDP.P	16(R13), (R8, R10)
	CRC32X	R8, R9
	CRC32X	R10, R9
	SUB	$16, R11

	JMP	update

less_than_16:
	TBZ $3, R11, less_than_8

	MOVD.P	8(R13), R10
	CRC32X	R10, R9

less_than_8:
	TBZ	$2, R11, less_than_4

	MOVWU.P	4(R13), R10
	CRC32W	R10, R9

less_than_4:
	TBZ	$1, R11, less_than_2

	MOVHU.P	2(R13), R10
	CRC32H	R10, R9

less_than_2:
	TBZ	$0, R11, done

	MOVBU	(R13), R10
	CRC32B	R10, R9

done:
	MOVWU	R9, ret+32(FP)
	RET