v8/test/mjsunit/unbox-smi-field.js

// Copyright 2015 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

function Foo(x) {
  this.x = x;
}

var f = new Foo(1);
var g = new Foo(2);

function add(a, b) {
  return a.x + b.x;
}

%PrepareFunctionForOptimization(add);
assertEquals(3, add(f, g));
assertEquals(3, add(g, f));
%OptimizeFunctionOnNextCall(add);
assertEquals(3, add(f, g));
assertEquals(3, add(g, f));