1 files changed, 23 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/compiler/number-max.js b/deps/v8/test/mjsunit/compiler/number-max.js
new file mode 100644
index 0000000000..7e5a4a4ad1
--- /dev/null
+++ b/deps/v8/test/mjsunit/compiler/number-max.js
@@ -0,0 +1,23 @@
+// Copyright 2018 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 --opt
+
+// Test that NumberMax properly passes the kIdentifyZeros truncation.
+(function() {
+  function foo(x) {
+    if (Math.max(x * -2, 1) == 1) return 0;
+    return 1;
+  }
+
+  assertEquals(0, foo(2));
+  assertEquals(1, foo(-1));
+  %OptimizeFunctionOnNextCall(foo);
+  assertEquals(0, foo(2));
+  assertEquals(1, foo(-1));
+  assertOptimized(foo);
+  // Now `foo` should stay optimized even if `x * -2` would produce `-0`.
+  assertEquals(0, foo(0));
+  assertOptimized(foo);
+})();