tail-call-babel-v8.js

function printStatus(fn) {
  var name = fn.name;
  switch(%GetOptimizationStatus(fn)) {
    case 1: console.log(name, ' is optimized'); break;
    case 2: console.log(name, ' is not optimized'); break;
    case 3: console.log(name, ' is always optimized'); break;
    case 4: console.log(name, ' is never optimized'); break;
    case 6: console.log(name, ' is maybe deoptimized'); break;
  }
}

factorial1(100);
factorial1(100);
%OptimizeFunctionOnNextCall(factorial1);
factorial1(100);
printStatus(factorial1);

facRec2(100, 1); // I should add that facRec2(100) leads to the same perf issue
facRec2(100, 1);
%OptimizeFunctionOnNextCall(facRec2);
facRec2(100, 1);
printStatus(facRec2);

facRec3(100, 1);
facRec3(100, 1);
%OptimizeFunctionOnNextCall(facRec3);
facRec3(100, 1);
printStatus(facRec3);