deopt.js

/*

cat deopt.js | node --trace-hydrogen --trace-phase=Z --trace-deopt --code-comments --hydrogen-track-positions --redirect-code-traces --redirect-code-traces-to=code.asm --allow-natives-syntax --print-opt-code

*/

function createObj () {
  return {
    "1": 1,
    "2": 2,
    "3": 3,
    "a": 4,
    "b": 5,
    "c": 6
  };
}

function computed (prop) {
  var foo = prop.valueOf();
  return createObj()[foo];
}

function run () {
  var acc = 0;

  acc += computed(1);
  acc += computed(2);
  acc += computed(3);
  acc += computed("a");
  acc += computed("b");
  acc += computed("c");

  acc += computed(1);
  acc += computed(2);
  acc += computed(3);
  acc += computed("a");
  acc += computed("b");
  acc += computed("c");
  return acc;
}

for (var i = 0; i < 10000; i++) {
  run();
}

console.log(run());