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);
```
65 lines
1.5 KiB
Diff
65 lines
1.5 KiB
Diff
- // MIR for `all_copy_2` before GVN
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+ // MIR for `all_copy_2` after GVN
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fn all_copy_2(_1: &&AllCopy) -> AllCopy {
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debug v => _1;
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let mut _0: AllCopy;
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let _2: i32;
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let mut _5: i32;
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let mut _6: u64;
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let mut _7: [i8; 3];
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let mut _8: &AllCopy;
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let mut _9: &AllCopy;
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let mut _10: &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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}
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}
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}
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bb0: {
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- StorageLive(_2);
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- _8 = deref_copy (*_1);
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+ nop;
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+ _8 = copy (*_1);
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_2 = copy ((*_8).0: i32);
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- StorageLive(_3);
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- _9 = deref_copy (*_1);
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- _3 = copy ((*_9).1: u64);
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- StorageLive(_4);
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- _10 = deref_copy (*_1);
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- _4 = copy ((*_10).2: [i8; 3]);
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+ nop;
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+ _9 = copy _8;
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+ _3 = copy ((*_8).1: u64);
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+ nop;
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+ _10 = copy _8;
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+ _4 = copy ((*_8).2: [i8; 3]);
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StorageLive(_5);
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_5 = copy _2;
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StorageLive(_6);
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_6 = copy _3;
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StorageLive(_7);
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_7 = copy _4;
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- _0 = AllCopy { a: move _5, b: move _6, c: move _7 };
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+ _0 = copy (*_8);
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StorageDead(_7);
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StorageDead(_6);
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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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return;
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}
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}
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