v8/test/mjsunit/regress/regress-2339.js

// Copyright 2012 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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//       with the distribution.
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//
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// Flags: --allow-natives-syntax --expose-gc --turbofan

function simple() {
  return simple_two_args(0, undefined);
}

function simple_two_args(always_zero, always_undefined) {
  var always_five = always_undefined || 5;
  return always_zero * always_five * .5;
}
%EnsureFeedbackVectorForFunction(simple_two_args);


%PrepareFunctionForOptimization(simple);
simple();
simple();
%OptimizeFunctionOnNextCall(simple);
simple();
assertOptimized(simple);
gc();