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Add a test

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This commit is contained in:
Michael Goulet 2025-03-02 18:52:33 +00:00
parent a59a8f9e75
commit 5f575bc4bc
1 changed files with 14 additions and 0 deletions
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14
tests/codegen/slice-init.rs
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@ -89,6 +89,20 @@ pub fn option_none_init() -> [Option<u8>; N] {
[None; N]
}
use std::mem::MaybeUninit;
// FIXME: This could be optimized into a memset.
// Regression test for <https://github.com/rust-lang/rust/issues/137892>.
#[no_mangle]
pub fn half_uninit() -> [(u128, MaybeUninit<u128>); N] {
// CHECK-NOT: select
// CHECK: br label %repeat_loop_header{{.*}}
// CHECK-NOT: switch
// CHECK: icmp
// CHECK-NOT: call void @llvm.memset.p0
[const { (0, MaybeUninit::uninit()) }; N]
}
// Use an opaque function to prevent rustc from removing useless drops.
#[inline(never)]
pub fn opaque(_: impl Sized) {}