Add test for updating enum discriminant through pointer

rust-lang-ci · Aug 3, 2024 · 8497800 · 8497800
1 parent c0e3298
commit 8497800
Showing 1 changed file with 19 additions and 0 deletions.
diff --git a/tests/codegen/issues/issue-122600-ptr-discriminant-update.rs 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));
+}