v8/test/mjsunit/compiler/stubs/floor-stub.js

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// Flags: --allow-natives-syntax --noalways-opt --turbo-filter=*

var stubs = %GetCodeStubExportsObject();

const kExtraTypeFeedbackMinusZeroSentinel = 1;
const kFirstJSFunctionTypeFeedbackIndex = 5;
const kFirstSlotExtraTypeFeedbackIndex = 5;

(function()  {
  var stub1 = stubs.MathFloorStub("MathFloorStub", 1);
  var tempForTypeVector = function(d) {
    return Math.round(d);
  }
  tempForTypeVector(5);
  var tv = %GetTypeFeedbackVector(tempForTypeVector);
  var floorFunc1 = function(v, first) {
    if (first) return;
    return stub1(stub1, kFirstSlotExtraTypeFeedbackIndex - 1, tv, undefined, v);
  };
  %OptimizeFunctionOnNextCall(stub1);
  floorFunc1(5, true);
  %FixedArraySet(tv, kFirstSlotExtraTypeFeedbackIndex - 1, stub1);
  assertTrue(kExtraTypeFeedbackMinusZeroSentinel !==
             %FixedArrayGet(tv, kFirstSlotExtraTypeFeedbackIndex));
  assertEquals(5.0, floorFunc1(5.5));
  assertTrue(kExtraTypeFeedbackMinusZeroSentinel !==
             %FixedArrayGet(tv, kFirstSlotExtraTypeFeedbackIndex));
  // Executing floor such that it returns -0 should set the proper sentinel in
  // the feedback vector.
  assertEquals(-Infinity, 1/floorFunc1(-0));
  assertEquals(kExtraTypeFeedbackMinusZeroSentinel,
               %FixedArrayGet(tv, kFirstSlotExtraTypeFeedbackIndex));
  %ClearFunctionTypeFeedback(floorFunc1);
})();