Text file src/pkg/hash/crc32/crc32_arm64.s
1 // Copyright 2017 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 #include "textflag.h"
6
7 // castagnoliUpdate updates the non-inverted crc with the given data.
8
9 // func castagnoliUpdate(crc uint32, p []byte) uint32
10 TEXT ·castagnoliUpdate(SB),NOSPLIT,$0-36
11 MOVWU crc+0(FP), R9 // CRC value
12 MOVD p+8(FP), R13 // data pointer
13 MOVD p_len+16(FP), R11 // len(p)
14
15 CMP $8, R11
16 BLT less_than_8
17
18 update:
19 MOVD.P 8(R13), R10
20 CRC32CX R10, R9
21 SUB $8, R11
22
23 CMP $8, R11
24 BLT less_than_8
25
26 JMP update
27
28 less_than_8:
29 TBZ $2, R11, less_than_4
30
31 MOVWU.P 4(R13), R10
32 CRC32CW R10, R9
33
34 less_than_4:
35 TBZ $1, R11, less_than_2
36
37 MOVHU.P 2(R13), R10
38 CRC32CH R10, R9
39
40 less_than_2:
41 TBZ $0, R11, done
42
43 MOVBU (R13), R10
44 CRC32CB R10, R9
45
46 done:
47 MOVWU R9, ret+32(FP)
48 RET
49
50 // ieeeUpdate updates the non-inverted crc with the given data.
51
52 // func ieeeUpdate(crc uint32, p []byte) uint32
53 TEXT ·ieeeUpdate(SB),NOSPLIT,$0-36
54 MOVWU crc+0(FP), R9 // CRC value
55 MOVD p+8(FP), R13 // data pointer
56 MOVD p_len+16(FP), R11 // len(p)
57
58 CMP $8, R11
59 BLT less_than_8
60
61 update:
62 MOVD.P 8(R13), R10
63 CRC32X R10, R9
64 SUB $8, R11
65
66 CMP $8, R11
67 BLT less_than_8
68
69 JMP update
70
71 less_than_8:
72 TBZ $2, R11, less_than_4
73
74 MOVWU.P 4(R13), R10
75 CRC32W R10, R9
76
77 less_than_4:
78 TBZ $1, R11, less_than_2
79
80 MOVHU.P 2(R13), R10
81 CRC32H R10, R9
82
83 less_than_2:
84 TBZ $0, R11, done
85
86 MOVBU (R13), R10
87 CRC32B R10, R9
88
89 done:
90 MOVWU R9, ret+32(FP)
91 RET
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