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Rollup merge of #119555 - Kobzol:maybeuninit-rvo-codegen-test, r=nikic

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Add codegen test for RVO on MaybeUninit

Codegen test for https://github.com/rust-lang/rust/issues/90595. Currently, this only works with `-Cpanic=abort`, but hopefully in the [future](https://www.npopov.com/2024/01/01/This-year-in-LLVM-2023.html#writable-and-dead_on_unwind) it should also work in the presence of panics.

r? ``@nikic``
This commit is contained in:
Matthias Krüger 2024-01-04 08:33:26 +01:00 committed by GitHub
commit c505d760a6
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33
tests/codegen/maybeuninit-rvo.rs Normal file
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// compile-flags: -O
#![feature(c_unwind)]
#![crate_type = "lib"]
pub struct Foo([u8; 1000]);
extern "C" {
fn init(p: *mut Foo);
}
pub fn new_from_uninit() -> Foo {
// CHECK-LABEL: new_from_uninit
// CHECK-NOT: call void @llvm.memcpy.
let mut x = std::mem::MaybeUninit::uninit();
unsafe {
init(x.as_mut_ptr());
x.assume_init()
}
}
extern "C-unwind" {
fn init_unwind(p: *mut Foo);
}
pub fn new_from_uninit_unwind() -> Foo {
// CHECK-LABEL: new_from_uninit
// CHECK: call void @llvm.memcpy.
let mut x = std::mem::MaybeUninit::uninit();
unsafe {
init_unwind(x.as_mut_ptr());
x.assume_init()
}
}