1 files changed, 55 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-50811.rs b/tests/ui/issues/issue-50811.rs
new file mode 100644
index 00000000000..683c856049f
--- /dev/null
+++ b/tests/ui/issues/issue-50811.rs
@@ -0,0 +1,55 @@
+// run-pass
+#![feature(test)]
+
+extern crate test;
+
+use std::mem::size_of;
+use test::black_box;
+
+// Ensure the const-eval result and runtime result of float comparison are equivalent.
+
+macro_rules! compare {
+    ($op:tt) => {
+        compare!(
+            [f64::NEG_INFINITY, -f64::MAX, -1.0, -0.0, 0.0, 1.0, f64::MAX, f64::INFINITY, f64::NAN],
+            $op
+        );
+    };
+    ([$($lhs:expr),+], $op:tt) => {
+        $(compare!(
+            $lhs,
+            $op,
+            [f64::NEG_INFINITY, -f64::MAX, -1.0, -0.0, 0.0, 1.0, f64::MAX, f64::INFINITY, f64::NAN]
+        );)+
+    };
+    ($lhs:expr, $op:tt, [$($rhs:expr),+]) => {
+        $({
+            // Wrap the check in its own function to reduce time needed to borrowck.
+            fn check() {
+                static CONST_EVAL: bool = $lhs $op $rhs;
+                let runtime_eval = black_box($lhs) $op black_box($rhs);
+                assert_eq!(CONST_EVAL, runtime_eval, stringify!($lhs $op $rhs));
+                assert_eq!(
+                    size_of::<[u8; ($lhs $op $rhs) as usize]>(),
+                    runtime_eval as usize,
+                    stringify!($lhs $op $rhs (forced const eval))
+                );
+            }
+            check();
+        })+
+    };
+}
+
+fn main() {
+    assert_eq!(0.0/0.0 < 0.0/0.0, false);
+    assert_eq!(0.0/0.0 > 0.0/0.0, false);
+    assert_eq!(f64::NAN < f64::NAN, false);
+    assert_eq!(f64::NAN > f64::NAN, false);
+
+    compare!(==);
+    compare!(!=);
+    compare!(<);
+    compare!(<=);
+    compare!(>);
+    compare!(>=);
+}