1// Copyright 2018 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 "go_asm.h"
6#include "textflag.h"
7
8TEXT ·IndexByte(SB), NOSPLIT, $0-40
9 I64Load b_base+0(FP)
10 I32WrapI64
11 I32Load8U c+24(FP)
12 I64Load b_len+8(FP)
13 I32WrapI64
14 Call memchr<>(SB)
15 I64ExtendI32U
16 Set R0
17
18 Get SP
19 I64Const $-1
20 Get R0
21 I64Load b_base+0(FP)
22 I64Sub
23 Get R0
24 I64Eqz $0
25 Select
26 I64Store ret+32(FP)
27
28 RET
29
30TEXT ·IndexByteString(SB), NOSPLIT, $0-32
31 Get SP
32 I64Load s_base+0(FP)
33 I32WrapI64
34 I32Load8U c+16(FP)
35 I64Load s_len+8(FP)
36 I32WrapI64
37 Call memchr<>(SB)
38 I64ExtendI32U
39 Set R0
40
41 I64Const $-1
42 Get R0
43 I64Load s_base+0(FP)
44 I64Sub
45 Get R0
46 I64Eqz $0
47 Select
48 I64Store ret+24(FP)
49
50 RET
51
52// initially compiled with emscripten and then modified over time.
53// params:
54// R0: s
55// R1: c
56// R2: len
57// ret: index
58TEXT memchr<>(SB), NOSPLIT, $0
59 Get R1
60 Set R4
61 Block
62 Block
63 Get R2
64 I32Const $0
65 I32Ne
66 Tee R3
67 Get R0
68 I32Const $3
69 I32And
70 I32Const $0
71 I32Ne
72 I32And
73 If
74 Loop
75 Get R0
76 I32Load8U $0
77 Get R1
78 I32Eq
79 BrIf $2
80 Get R2
81 I32Const $-1
82 I32Add
83 Tee R2
84 I32Const $0
85 I32Ne
86 Tee R3
87 Get R0
88 I32Const $1
89 I32Add
90 Tee R0
91 I32Const $3
92 I32And
93 I32Const $0
94 I32Ne
95 I32And
96 BrIf $0
97 End
98 End
99 Get R3
100 BrIf $0
101 I32Const $0
102 Set R1
103 Br $1
104 End
105 Get R0
106 I32Load8U $0
107 Get R4
108 Tee R3
109 I32Eq
110 If
111 Get R2
112 Set R1
113 Else
114 Get R4
115 I32Const $16843009
116 I32Mul
117 Set R4
118 Block
119 Block
120 Get R2
121 I32Const $3
122 I32GtU
123 If
124 Get R2
125 Set R1
126 Loop
127 Get R0
128 I32Load $0
129 Get R4
130 I32Xor
131 Tee R2
132 I32Const $-2139062144
133 I32And
134 I32Const $-2139062144
135 I32Xor
136 Get R2
137 I32Const $-16843009
138 I32Add
139 I32And
140 I32Eqz
141 If
142 Get R0
143 I32Const $4
144 I32Add
145 Set R0
146 Get R1
147 I32Const $-4
148 I32Add
149 Tee R1
150 I32Const $3
151 I32GtU
152 BrIf $1
153 Br $3
154 End
155 End
156 Else
157 Get R2
158 Set R1
159 Br $1
160 End
161 Br $1
162 End
163 Get R1
164 I32Eqz
165 If
166 I32Const $0
167 Set R1
168 Br $3
169 End
170 End
171 Loop
172 Get R0
173 I32Load8U $0
174 Get R3
175 I32Eq
176 BrIf $2
177 Get R0
178 I32Const $1
179 I32Add
180 Set R0
181 Get R1
182 I32Const $-1
183 I32Add
184 Tee R1
185 BrIf $0
186 I32Const $0
187 Set R1
188 End
189 End
190 End
191 Get R0
192 I32Const $0
193 Get R1
194 Select
195 Return
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