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
|
<!---======================= begin_copyright_notice ============================
Copyright (C) 2020-2022 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ==========================-->
## Opcode
LIFETIME = 0x7b
## Format
| | | |
| --- | --- | --- |
| 0x7b(LIFETIME) | properties | variable |
## Semantics
```
Marks the start/end of a variable's lifetime.
```
## Description
Specifies either the start or the end of a variable's lifetime.
- **properties(ub):**
- Bit[0]: indicates whether this is the start or the end
- 0b0: start
- 0b1: end
- Bit[5..4]: specifies the variable class
- 0b00: general variable
- 0b01: address variable
- 0b10: predicate variable
- **variable(ud):**
#### Properties
## Text
```
LIFETIME.start <variable>
LIFETIME.end <variable>
```
## Notes
The behavior is undefined if the variable or one of its aliases is
referenced directly or indirectly outside the lifetime markers.
|
