1 files changed, 33 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/testBug504520Harder.js b/js/src/jit-test/tests/basic/testBug504520Harder.js
new file mode 100644
index 0000000000..9a08193195
--- /dev/null
+++ b/js/src/jit-test/tests/basic/testBug504520Harder.js
@@ -0,0 +1,33 @@
+function testBug504520Harder() {
+    // test 1024 similar cases
+    var vals = [1/0, -1/0, 0, 0/0];
+    var ops = ["===", "!==", "==", "!=", "<", ">", "<=", ">="];
+    for (var x of vals) {
+        for (var y of vals) {
+            for (var op of ops) {
+                for (var z of vals) {
+                    // Assume eval is correct. This depends on the global
+                    // Infinity property not having been reassigned.
+                    var xz = eval(x + op + z);
+                    var yz = eval(y + op + z);
+
+                    var arr = [x, x, x, x, x, x, x, x, x, y];
+                    assertEq(arr.length > 9, true);
+                    var expected = [xz, xz, xz, xz, xz, xz, xz, xz, xz, yz];
+
+                    // ?: looks superfluous but that's what we're testing here
+                    var fun = eval(
+                        '(function (arr, results) {\n' +
+                        '    for (let i = 0; i < arr.length; i++)\n' +
+                        '        results.push(arr[i]' + op + z + ' ? "true" : "false");\n' +
+                        '});\n');
+                    var actual = [];
+                    fun(arr, actual);
+		    print(x, y, op, z);
+                    assertEq("" + actual, "" + expected);
+                }
+            }
+        }
+    }
+}
+testBug504520Harder();