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
|
// Copyright 2022 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 "go_asm.h"
#include "textflag.h"
TEXT ·IndexByte(SB),NOSPLIT,$0-40
MOVV b_base+0(FP), R4
MOVV b_len+8(FP), R5
MOVBU c+24(FP), R6 // byte to find
MOVV R4, R7 // store base for later
ADDV R4, R5 // end
ADDV $-1, R4
PCALIGN $16
loop:
ADDV $1, R4
BEQ R4, R5, notfound
MOVBU (R4), R8
BNE R6, R8, loop
SUBV R7, R4 // remove base
MOVV R4, ret+32(FP)
RET
notfound:
MOVV $-1, R4
MOVV R4, ret+32(FP)
RET
TEXT ·IndexByteString(SB),NOSPLIT,$0-32
MOVV s_base+0(FP), R4
MOVV s_len+8(FP), R5
MOVBU c+16(FP), R6 // byte to find
MOVV R4, R7 // store base for later
ADDV R4, R5 // end
ADDV $-1, R4
PCALIGN $16
loop:
ADDV $1, R4
BEQ R4, R5, notfound
MOVBU (R4), R8
BNE R6, R8, loop
SUBV R7, R4 // remove base
MOVV R4, ret+24(FP)
RET
notfound:
MOVV $-1, R4
MOVV R4, ret+24(FP)
RET
|
