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);
```
44 lines
966 B
Rust
44 lines
966 B
Rust
//@ compile-flags: -Cdebuginfo=full
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// Check if we have transformed the nested clone to the copy in the complete pipeline.
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#[derive(Clone)]
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struct AllCopy {
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a: i32,
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b: u64,
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c: [i8; 3],
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}
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#[derive(Clone)]
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struct NestCopy {
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a: i32,
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b: AllCopy,
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c: [i8; 3],
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}
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#[derive(Clone)]
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enum Enum1 {
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A(AllCopy),
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B(NestCopy),
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}
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// EMIT_MIR clone_as_copy.clone_as_copy.PreCodegen.after.mir
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fn clone_as_copy(v: &NestCopy) -> NestCopy {
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// CHECK-LABEL: fn clone_as_copy(
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// CHECK-NOT: = AllCopy { {{.*}} };
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// CHECK-NOT: = NestCopy { {{.*}} };
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// CHECK: _0 = copy (*_1);
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// CHECK: return;
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v.clone()
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}
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// FIXME: We can merge into exactly one assignment statement.
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// EMIT_MIR clone_as_copy.enum_clone_as_copy.PreCodegen.after.mir
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fn enum_clone_as_copy(v: &Enum1) -> Enum1 {
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// CHECK-LABEL: fn enum_clone_as_copy(
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// CHECK-NOT: = Enum1::
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// CHECK: _0 = copy (*_1);
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// CHECK: _0 = copy (*_1);
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v.clone()
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}
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