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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
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+ // MIR for `nest_copy` after GVN
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fn nest_copy(_1: &NestCopy) -> NestCopy {
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debug v => _1;
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let mut _0: NestCopy;
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let _2: i32;
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let mut _6: i32;
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let mut _7: u64;
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let mut _8: [i8; 3];
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let mut _10: i32;
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let mut _11: AllCopy;
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scope 1 {
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debug a => _2;
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let _3: u64;
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scope 2 {
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debug b => _3;
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let _4: [i8; 3];
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scope 3 {
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debug c => _4;
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let _5: AllCopy;
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scope 4 {
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debug all_copy => _5;
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let _9: i32;
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scope 5 {
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debug d => _9;
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}
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}
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}
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}
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}
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bb0: {
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- StorageLive(_2);
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+ nop;
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_2 = copy (((*_1).1: AllCopy).0: i32);
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- StorageLive(_3);
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+ nop;
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_3 = copy (((*_1).1: AllCopy).1: u64);
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- StorageLive(_4);
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+ nop;
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_4 = copy (((*_1).1: AllCopy).2: [i8; 3]);
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- StorageLive(_5);
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+ nop;
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StorageLive(_6);
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_6 = copy _2;
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StorageLive(_7);
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_7 = copy _3;
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StorageLive(_8);
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_8 = copy _4;
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- _5 = AllCopy { a: move _6, b: move _7, c: move _8 };
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+ _5 = copy ((*_1).1: AllCopy);
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StorageDead(_8);
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StorageDead(_7);
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StorageDead(_6);
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- StorageLive(_9);
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+ nop;
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_9 = copy ((*_1).0: i32);
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StorageLive(_10);
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_10 = copy _9;
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StorageLive(_11);
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- _11 = move _5;
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- _0 = NestCopy { d: move _10, all_copy: move _11 };
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+ _11 = copy _5;
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+ _0 = copy (*_1);
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StorageDead(_11);
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StorageDead(_10);
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- StorageDead(_9);
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- StorageDead(_5);
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- StorageDead(_4);
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- StorageDead(_3);
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- StorageDead(_2);
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+ nop;
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+ nop;
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+ nop;
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+ nop;
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+ nop;
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return;
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}
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}
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