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// Flags: --allow-natives-syntax --expose-natives-as=builtins --noalways-opt

const kExtraTypeFeedbackMinusZeroSentinel = 1;
const kFirstSlotExtraTypeFeedbackIndex = 5;

(function(){
  var floorFunc = function() {
    Math.floor(NaN);
  }
  // Execute the function once to make sure it has a type feedback vector.
  floorFunc(5);
  var stub = builtins.MathFloorStub("MathFloorStub", 0);
  assertTrue(kExtraTypeFeedbackMinusZeroSentinel !==
             %FixedArrayGet(%GetTypeFeedbackVector(floorFunc),
                            kFirstSlotExtraTypeFeedbackIndex));
  assertEquals(5.0, stub(floorFunc, 4, 5.5));
  assertTrue(kExtraTypeFeedbackMinusZeroSentinel !==
             %FixedArrayGet(%GetTypeFeedbackVector(floorFunc),
                            kFirstSlotExtraTypeFeedbackIndex));
  // Executing floor such that it returns -0 should set the proper sentinel in
  // the feedback vector.
  assertEquals(-Infinity, 1/stub(floorFunc, 4, -0));
  assertEquals(kExtraTypeFeedbackMinusZeroSentinel,
               %FixedArrayGet(%GetTypeFeedbackVector(floorFunc),
                              kFirstSlotExtraTypeFeedbackIndex));
  %ClearFunctionTypeFeedback(floorFunc);
})();