mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-30 02:33:55 +00:00
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);
```
58 lines
1.4 KiB
Diff
58 lines
1.4 KiB
Diff
- // MIR for `all_copy_use_changed` before GVN
|
|
+ // MIR for `all_copy_use_changed` after GVN
|
|
|
|
fn all_copy_use_changed(_1: &mut AllCopy) -> AllCopy {
|
|
debug v => _1;
|
|
let mut _0: AllCopy;
|
|
let mut _2: i32;
|
|
let mut _3: i32;
|
|
let mut _6: i32;
|
|
let mut _7: u64;
|
|
let mut _8: [i8; 3];
|
|
scope 1 {
|
|
debug a => _2;
|
|
let _4: u64;
|
|
scope 2 {
|
|
debug b => _4;
|
|
let _5: [i8; 3];
|
|
scope 3 {
|
|
debug c => _5;
|
|
}
|
|
}
|
|
}
|
|
|
|
bb0: {
|
|
StorageLive(_2);
|
|
_2 = copy ((*_1).0: i32);
|
|
((*_1).0: i32) = const 1_i32;
|
|
StorageLive(_3);
|
|
_3 = copy ((*_1).0: i32);
|
|
_2 = move _3;
|
|
StorageDead(_3);
|
|
- StorageLive(_4);
|
|
+ nop;
|
|
_4 = copy ((*_1).1: u64);
|
|
- StorageLive(_5);
|
|
+ nop;
|
|
_5 = copy ((*_1).2: [i8; 3]);
|
|
StorageLive(_6);
|
|
_6 = copy _2;
|
|
StorageLive(_7);
|
|
_7 = copy _4;
|
|
StorageLive(_8);
|
|
_8 = copy _5;
|
|
- _0 = AllCopy { a: move _6, b: move _7, c: move _8 };
|
|
+ _0 = AllCopy { a: move _6, b: copy _4, c: copy _5 };
|
|
StorageDead(_8);
|
|
StorageDead(_7);
|
|
StorageDead(_6);
|
|
- StorageDead(_5);
|
|
- StorageDead(_4);
|
|
+ nop;
|
|
+ nop;
|
|
StorageDead(_2);
|
|
return;
|
|
}
|
|
}
|
|
|