[stubs] A new approach to TF stubs

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);
-})();