diff options
Diffstat (limited to 'src/test/codegen/box-maybe-uninit-llvm14.rs')
| -rw-r--r-- | src/test/codegen/box-maybe-uninit-llvm14.rs | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/test/codegen/box-maybe-uninit-llvm14.rs b/src/test/codegen/box-maybe-uninit-llvm14.rs new file mode 100644 index 000000000..bd1a6599c --- /dev/null +++ b/src/test/codegen/box-maybe-uninit-llvm14.rs @@ -0,0 +1,26 @@ +// compile-flags: -O + +// Once we're done with llvm 14 and earlier, this test can be deleted. + +#![crate_type="lib"] + +use std::mem::MaybeUninit; + +// Boxing a `MaybeUninit` value should not copy junk from the stack +#[no_mangle] +pub fn box_uninitialized() -> Box<MaybeUninit<usize>> { + // CHECK-LABEL: @box_uninitialized + // CHECK-NOT: store + // CHECK-NOT: alloca + // CHECK-NOT: memcpy + // CHECK-NOT: memset + Box::new(MaybeUninit::uninit()) +} + +// FIXME: add a test for a bigger box. Currently broken, see +// https://github.com/rust-lang/rust/issues/58201. + +// Hide the LLVM 15+ `allocalign` attribute in the declaration of __rust_alloc +// from the CHECK-NOT above. We don't check the attributes here because we can't rely +// on all of them being set until LLVM 15. +// CHECK: declare noalias{{.*}} @__rust_alloc(i{{[0-9]+}}, i{{[0-9]+.*}}) |