1 files changed, 18 insertions, 0 deletions
diff --git a/tests/codegen/bool-cmp.rs b/tests/codegen/bool-cmp.rs
new file mode 100644
index 000000000..5090f7c37
--- /dev/null
+++ b/tests/codegen/bool-cmp.rs
@@ -0,0 +1,18 @@
+// This is a test for optimal Ord trait implementation for bool.
+// See <https://github.com/rust-lang/rust/issues/66780> for more info.
+
+// compile-flags: -C opt-level=3
+
+#![crate_type = "lib"]
+
+use std::cmp::Ordering;
+
+// CHECK-LABEL: @cmp_bool
+#[no_mangle]
+pub fn cmp_bool(a: bool, b: bool) -> Ordering {
+// LLVM 10 produces (zext a) + (sext b), but the final lowering is (zext a) - (zext b).
+// CHECK: zext i1
+// CHECK: {{z|s}}ext i1
+// CHECK: {{sub|add}} nsw
+    a.cmp(&b)
+}