Index: test/mjsunit/compiler/instanceof-opt1.js |
diff --git a/test/mjsunit/compiler/instanceof-opt1.js b/test/mjsunit/compiler/instanceof-opt1.js |
new file mode 100644 |
index 0000000000000000000000000000000000000000..6ffdfc0ab1be4df0e9e7e4a05100cdbb321aa69c |
--- /dev/null |
+++ b/test/mjsunit/compiler/instanceof-opt1.js |
@@ -0,0 +1,18 @@ |
+// Copyright 2016 the V8 project authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+// Flags: --allow-natives-syntax |
+ |
+var Foo = { |
+ [Symbol.hasInstance]: Function.prototype[Symbol.hasInstance] |
+}; |
+ |
+// TurboFan will optimize this to false via constant-folding the |
+// OrdinaryHasInstance call inside Function.prototype[@@hasInstance]. |
+function foo() { return 1 instanceof Foo; } |
+ |
+assertEquals(false, foo()); |
+assertEquals(false, foo()); |
+%OptimizeFunctionOnNextCall(foo); |
+assertEquals(false, foo()); |