Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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]+.*}})