bjoernager/rust
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Simplify the canonical clone method to copy

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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);
```
This commit is contained in:
DianQK 2024-08-21 21:45:47 +08:00
parent 23b04c0513
commit c16c22cc9c
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27 changed files with 1642 additions and 52 deletions
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6
tests/codegen/enum/unreachable_enum_default_branch.rs
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@ -28,11 +28,13 @@ pub fn implicit_match(x: Int) -> bool {
// The code is from https://github.com/rust-lang/rust/issues/110097.
// We expect it to generate the same optimized code as a full match.
// CHECK-LABEL: @if_let(
// CHECK-NEXT: start:
// CHECK: start:
// CHECK-NOT: zext
// CHECK: select
// CHECK-NEXT: insertvalue
// CHECK-NEXT: insertvalue
// CHECK-NEXT: ret
#[no_mangle]
pub fn if_let(val: Result<i32, ()>) -> Result<i32, ()> {
if let Ok(x) = val { Ok(x) } else { Err(()) }
if let Ok(x) = val { Ok(x * 2) } else { Err(()) }
}