test/webkit/dfg-constant-fold-logical-not-branch.js

// Copyright 2013 the V8 project authors. All rights reserved.
// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
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description(
"Tests what happens if we fail to constant fold a LogicalNot that leads into a branch, when the CFA proves that the LogicalNot has a constant value."
);

function foo1(o) {
    if (!!o.thingy)
        return o.thingy(42);
    else
        return o.otherThingy(57);
}

function foo2(o) {
    if (!o.thingy)
        return o.otherThingy(42);
    else
        return o.thingy(57);
}

function Stuff() {
}

Stuff.prototype = {
    thingy: function(x) { return x + 1; },
    otherThingy: function(x) { return x - 1; }
};

for (var i = 0; i < 1000; ++i) {
    shouldBe("foo1(new Stuff())", "43");
    shouldBe("foo2(new Stuff())", "58");
}