From c23a457e72abe608715ac76f076f47dc42af07a5 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 30 May 2024 20:31:44 +0200
Subject: Merging upstream version 1.74.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 tests/codegen/box-uninit-bytes.rs | 46 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 tests/codegen/box-uninit-bytes.rs

(limited to 'tests/codegen/box-uninit-bytes.rs')

diff --git a/tests/codegen/box-uninit-bytes.rs b/tests/codegen/box-uninit-bytes.rs
new file mode 100644
index 000000000..732da0a17
--- /dev/null
+++ b/tests/codegen/box-uninit-bytes.rs
@@ -0,0 +1,46 @@
+// compile-flags: -O
+#![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())
+}
+
+#[repr(align(1024))]
+pub struct LotsaPadding(usize);
+
+// Boxing a value with padding should not copy junk from the stack
+#[no_mangle]
+pub fn box_lotsa_padding() -> Box<LotsaPadding> {
+    // CHECK-LABEL: @box_lotsa_padding
+    // CHECK-NOT: alloca
+    // CHECK-NOT: getelementptr
+    // CHECK-NOT: memcpy
+    // CHECK-NOT: memset
+    Box::new(LotsaPadding(42))
+}
+
+// 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 {{(dso_local )?}}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