Add regression test for LLVM 17-rc3 miscompile

See rust-lang#115385 for more details.

Author: djkoloski

tests/codegen/issues/issue-115385.rs

@@ -0,0 +1,50 @@
+// compile-flags: -O -Ccodegen-units=1
+// only-x86_64-unknown-linux-gnu
+
+#![crate_type = "lib"]
+
+#[repr(i64)]
+pub enum Boolean {
+ False = 0,
+ True = 1,
+}
+
+impl Clone for Boolean {
+ fn clone(&self) -> Self {
+ *self
+ }
+}
+
+impl Copy for Boolean {}
+
+extern "C" {
+ fn set_value(foo: *mut i64);
+}
+
+pub fn foo(x: bool) {
+ let mut foo = core::mem::MaybeUninit::<i64>::uninit();
+ unsafe {
+ set_value(foo.as_mut_ptr());
+ }
+
+ if x {
+ let l1 = unsafe { *foo.as_mut_ptr().cast::<Boolean>() };
+ if matches!(l1, Boolean::False) {
+ unsafe {
+ *foo.as_mut_ptr() = 0;
+ }
+ }
+ }
+
+ let l2 = unsafe { *foo.as_mut_ptr() };
+ if l2 == 2 {
+ // CHECK: call void @bar
+ bar();
+ }
+}
+
+#[no_mangle]
+#[inline(never)]
+pub fn bar() {
+ println!("Working correctly!");
+}