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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);
```
163 lines
4.2 KiB
Diff
163 lines
4.2 KiB
Diff
- // MIR for `enum_different_variant` before GVN
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+ // MIR for `enum_different_variant` after GVN
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fn enum_different_variant(_1: &Enum1) -> Enum1 {
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debug v => _1;
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let mut _0: Enum1;
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let mut _2: isize;
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let _3: &AllCopy;
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let mut _8: i32;
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let mut _9: u64;
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let mut _10: [i8; 3];
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let mut _11: AllCopy;
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let _12: &AllCopy;
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let mut _17: i32;
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let mut _18: u64;
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let mut _19: [i8; 3];
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let mut _20: AllCopy;
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scope 1 {
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debug v => _3;
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let _4: i32;
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scope 2 {
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debug a => _4;
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let _5: u64;
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scope 3 {
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debug b => _5;
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let _6: [i8; 3];
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scope 4 {
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debug c => _6;
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let _7: AllCopy;
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scope 5 {
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debug all_copy => _7;
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}
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}
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}
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}
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}
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scope 6 {
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debug v => _12;
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let _13: i32;
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scope 7 {
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debug a => _13;
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let _14: u64;
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scope 8 {
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debug b => _14;
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let _15: [i8; 3];
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scope 9 {
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debug c => _15;
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let _16: AllCopy;
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scope 10 {
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debug all_copy => _16;
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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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_2 = discriminant((*_1));
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switchInt(move _2) -> [0: bb3, 1: bb2, otherwise: bb1];
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}
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bb1: {
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unreachable;
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}
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bb2: {
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StorageLive(_12);
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_12 = &(((*_1) as B).0: AllCopy);
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- StorageLive(_13);
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- _13 = copy ((*_12).0: i32);
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- StorageLive(_14);
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- _14 = copy ((*_12).1: u64);
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- StorageLive(_15);
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- _15 = copy ((*_12).2: [i8; 3]);
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- StorageLive(_16);
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+ nop;
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+ _13 = copy ((((*_1) as B).0: AllCopy).0: i32);
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+ nop;
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+ _14 = copy ((((*_1) as B).0: AllCopy).1: u64);
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+ nop;
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+ _15 = copy ((((*_1) as B).0: AllCopy).2: [i8; 3]);
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+ nop;
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StorageLive(_17);
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_17 = copy _13;
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StorageLive(_18);
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_18 = copy _14;
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StorageLive(_19);
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_19 = copy _15;
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- _16 = AllCopy { a: move _17, b: move _18, c: move _19 };
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+ _16 = copy (((*_1) as B).0: AllCopy);
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StorageDead(_19);
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StorageDead(_18);
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StorageDead(_17);
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StorageLive(_20);
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- _20 = move _16;
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- _0 = Enum1::A(move _20);
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+ _20 = copy _16;
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+ _0 = Enum1::A(copy _16);
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StorageDead(_20);
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- StorageDead(_16);
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- StorageDead(_15);
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- StorageDead(_14);
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- StorageDead(_13);
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+ nop;
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+ nop;
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+ nop;
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+ nop;
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StorageDead(_12);
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goto -> bb4;
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}
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bb3: {
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StorageLive(_3);
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_3 = &(((*_1) as A).0: AllCopy);
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- StorageLive(_4);
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- _4 = copy ((*_3).0: i32);
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- StorageLive(_5);
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- _5 = copy ((*_3).1: u64);
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- StorageLive(_6);
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- _6 = copy ((*_3).2: [i8; 3]);
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- StorageLive(_7);
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+ nop;
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+ _4 = copy ((((*_1) as A).0: AllCopy).0: i32);
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+ nop;
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+ _5 = copy ((((*_1) as A).0: AllCopy).1: u64);
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+ nop;
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+ _6 = copy ((((*_1) as A).0: AllCopy).2: [i8; 3]);
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+ nop;
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StorageLive(_8);
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_8 = copy _4;
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StorageLive(_9);
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_9 = copy _5;
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StorageLive(_10);
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_10 = copy _6;
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- _7 = AllCopy { a: move _8, b: move _9, c: move _10 };
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+ _7 = copy (((*_1) as A).0: AllCopy);
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StorageDead(_10);
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StorageDead(_9);
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StorageDead(_8);
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StorageLive(_11);
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- _11 = move _7;
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- _0 = Enum1::B(move _11);
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+ _11 = copy _7;
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+ _0 = Enum1::B(copy _7);
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StorageDead(_11);
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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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+ nop;
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+ nop;
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+ nop;
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+ nop;
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StorageDead(_3);
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goto -> bb4;
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}
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bb4: {
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return;
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}
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}
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