mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-28 09:36:05 +01:00
c16c22cc9c
The optimized clone method ends up as the following MIR:
```
_2 = copy ((*_1).0: i32);
_3 = copy ((*_1).1: u64);
_4 = copy ((*_1).2: [i8; 3]);
_0 = Foo { a: move _2, b: move _3, c: move _4 };
```
We can transform this to:
```
_0 = copy (*_1);
```
82 lines
2.0 KiB
Diff
82 lines
2.0 KiB
Diff
- // MIR for `nest_copy` before GVN
|
|
+ // MIR for `nest_copy` after GVN
|
|
|
|
fn nest_copy(_1: &NestCopy) -> NestCopy {
|
|
debug v => _1;
|
|
let mut _0: NestCopy;
|
|
let _2: i32;
|
|
let mut _6: i32;
|
|
let mut _7: u64;
|
|
let mut _8: [i8; 3];
|
|
let mut _10: i32;
|
|
let mut _11: AllCopy;
|
|
scope 1 {
|
|
debug a => _2;
|
|
let _3: u64;
|
|
scope 2 {
|
|
debug b => _3;
|
|
let _4: [i8; 3];
|
|
scope 3 {
|
|
debug c => _4;
|
|
let _5: AllCopy;
|
|
scope 4 {
|
|
debug all_copy => _5;
|
|
let _9: i32;
|
|
scope 5 {
|
|
debug d => _9;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
bb0: {
|
|
- StorageLive(_2);
|
|
+ nop;
|
|
_2 = copy (((*_1).1: AllCopy).0: i32);
|
|
- StorageLive(_3);
|
|
+ nop;
|
|
_3 = copy (((*_1).1: AllCopy).1: u64);
|
|
- StorageLive(_4);
|
|
+ nop;
|
|
_4 = copy (((*_1).1: AllCopy).2: [i8; 3]);
|
|
- StorageLive(_5);
|
|
+ nop;
|
|
StorageLive(_6);
|
|
_6 = copy _2;
|
|
StorageLive(_7);
|
|
_7 = copy _3;
|
|
StorageLive(_8);
|
|
_8 = copy _4;
|
|
- _5 = AllCopy { a: move _6, b: move _7, c: move _8 };
|
|
+ _5 = copy ((*_1).1: AllCopy);
|
|
StorageDead(_8);
|
|
StorageDead(_7);
|
|
StorageDead(_6);
|
|
- StorageLive(_9);
|
|
+ nop;
|
|
_9 = copy ((*_1).0: i32);
|
|
StorageLive(_10);
|
|
_10 = copy _9;
|
|
StorageLive(_11);
|
|
- _11 = move _5;
|
|
- _0 = NestCopy { d: move _10, all_copy: move _11 };
|
|
+ _11 = copy _5;
|
|
+ _0 = copy (*_1);
|
|
StorageDead(_11);
|
|
StorageDead(_10);
|
|
- StorageDead(_9);
|
|
- StorageDead(_5);
|
|
- StorageDead(_4);
|
|
- StorageDead(_3);
|
|
- StorageDead(_2);
|
|
+ nop;
|
|
+ nop;
|
|
+ nop;
|
|
+ nop;
|
|
+ nop;
|
|
return;
|
|
}
|
|
}
|
|
|