From a4b7ed7a42c716ab9f05e351f003d589124fd55d Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:18:58 +0200 Subject: Adding upstream version 1.68.2+dfsg1. Signed-off-by: Daniel Baumann --- tests/codegen/box-maybe-uninit.rs | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 tests/codegen/box-maybe-uninit.rs (limited to 'tests/codegen/box-maybe-uninit.rs') 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> { + // 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> { + // 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" {{.*}} } -- cgit v1.2.3