From 8497800abde9214041e11f35efdbfa437f761001 Mon Sep 17 00:00:00 2001
From: clubby789 <jamie@hill-daniel.co.uk>
Date: Thu, 1 Aug 2024 15:41:17 +0000
Subject: [PATCH] Add test for updating enum discriminant through pointer

---
 .../issue-122600-ptr-discriminant-update.rs   | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 tests/codegen/issues/issue-122600-ptr-discriminant-update.rs

diff --git a/tests/codegen/issues/issue-122600-ptr-discriminant-update.rs b/tests/codegen/issues/issue-122600-ptr-discriminant-update.rs
new file mode 100644
index 0000000000000..4b520a6206951
--- /dev/null
+++ b/tests/codegen/issues/issue-122600-ptr-discriminant-update.rs
@@ -0,0 +1,19 @@
+//@ compile-flags: -O
+//@ min-llvm-version: 19
+
+#![crate_type = "lib"]
+
+pub enum State {
+    A([u8; 753]),
+    B([u8; 753]),
+}
+
+// CHECK-LABEL: @update
+#[no_mangle]
+pub unsafe fn update(s: *mut State) {
+    // CHECK-NEXT: start:
+    // CHECK-NEXT: store i8
+    // CHECK-NEXT: ret
+    let State::A(v) = s.read() else { std::hint::unreachable_unchecked() };
+    s.write(State::B(v));
+}