From c18da3ccd4cca6295bba599324962a469aae9aa9 Mon Sep 17 00:00:00 2001
From: David Koloski <dkoloski@google.com>
Date: Wed, 6 Sep 2023 02:21:56 +0000
Subject: [PATCH 1/2] Add regression test for LLVM 17-rc3 miscompile

See #115385 for more details.
---
 tests/codegen/issues/issue-115385.rs | 50 ++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 tests/codegen/issues/issue-115385.rs

diff --git a/tests/codegen/issues/issue-115385.rs b/tests/codegen/issues/issue-115385.rs
new file mode 100644
index 00000000000..773b3507f23
--- /dev/null
+++ b/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!");
+}

From ddd8878d697ac0006b25000137d457093917ae12 Mon Sep 17 00:00:00 2001
From: David Koloski <dkoloski@google.com>
Date: Wed, 6 Sep 2023 22:13:56 +0000
Subject: [PATCH 2/2] Address feedback

---
 ...115385.rs => issue-115385-llvm-jump-threading.rs} | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)
 rename tests/codegen/issues/{issue-115385.rs => issue-115385-llvm-jump-threading.rs} (84%)

diff --git a/tests/codegen/issues/issue-115385.rs b/tests/codegen/issues/issue-115385-llvm-jump-threading.rs
similarity index 84%
rename from tests/codegen/issues/issue-115385.rs
rename to tests/codegen/issues/issue-115385-llvm-jump-threading.rs
index 773b3507f23..142e3596d96 100644
--- a/tests/codegen/issues/issue-115385.rs
+++ b/tests/codegen/issues/issue-115385-llvm-jump-threading.rs
@@ -1,5 +1,4 @@
 // compile-flags: -O -Ccodegen-units=1
-// only-x86_64-unknown-linux-gnu
 
 #![crate_type = "lib"]
 
@@ -19,6 +18,7 @@ impl Copy for Boolean {}
 
 extern "C" {
     fn set_value(foo: *mut i64);
+    fn bar();
 }
 
 pub fn foo(x: bool) {
@@ -39,12 +39,8 @@ pub fn foo(x: bool) {
     let l2 = unsafe { *foo.as_mut_ptr() };
     if l2 == 2 {
         // CHECK: call void @bar
-        bar();
+        unsafe {
+            bar();
+        }
     }
 }
-
-#[no_mangle]
-#[inline(never)]
-pub fn bar() {
-    println!("Working correctly!");
-}