diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:18:58 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:18:58 +0000 |
commit | a4b7ed7a42c716ab9f05e351f003d589124fd55d (patch) | |
tree | b620cd3f223850b28716e474e80c58059dca5dd4 /tests/codegen/box-maybe-uninit.rs | |
parent | Adding upstream version 1.67.1+dfsg1. (diff) | |
download | rustc-a4b7ed7a42c716ab9f05e351f003d589124fd55d.tar.xz rustc-a4b7ed7a42c716ab9f05e351f003d589124fd55d.zip |
Adding upstream version 1.68.2+dfsg1.upstream/1.68.2+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/codegen/box-maybe-uninit.rs')
-rw-r--r-- | tests/codegen/box-maybe-uninit.rs | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/tests/codegen/box-maybe-uninit.rs b/tests/codegen/box-maybe-uninit.rs new file mode 100644 index 000000000..2f8896699 --- /dev/null +++ b/tests/codegen/box-maybe-uninit.rs @@ -0,0 +1,33 @@ +// compile-flags: -O +// min-llvm-version: 15.0 +#![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()) +} + +// https://github.com/rust-lang/rust/issues/58201 +#[no_mangle] +pub fn box_uninitialized2() -> Box<MaybeUninit<[usize; 1024 * 1024]>> { + // CHECK-LABEL: @box_uninitialized2 + // CHECK-NOT: store + // CHECK-NOT: alloca + // CHECK-NOT: memcpy + // CHECK-NOT: memset + Box::new(MaybeUninit::uninit()) +} + +// Hide the `allocalign` attribute in the declaration of __rust_alloc +// from the CHECK-NOT above, and also verify the attributes got set reasonably. +// CHECK: declare noalias noundef ptr @__rust_alloc(i{{[0-9]+}} noundef, i{{[0-9]+}} allocalign noundef) unnamed_addr [[RUST_ALLOC_ATTRS:#[0-9]+]] + +// CHECK-DAG: attributes [[RUST_ALLOC_ATTRS]] = { {{.*}} allockind("alloc,uninitialized,aligned") allocsize(0) uwtable "alloc-family"="__rust_alloc" {{.*}} } |