Arguments De-Opt

JavaScript performance comparison

Test case created by Malte Ubl

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Testing in unknown unknown
Test Ops/sec
arguments appears
 
function test() {
  arguments;
  var sum = 0;
  for(var i = 0; i < 10000; i++) {
    for(var n = 0; n < 1000; n++) {
      sum += n;
    }
  }
}
test();
 pending…
Convert to array
 
function test() {
  var a = Array.prototype.slice.call(arguments);
  var sum = 0;
  for(var i = 0; i < 10000; i++) {
    for(var n = 0; n < 1000; n++) {
      sum += n;
    }
  }
}
test();
 pending…
Indexed access
 
function test() {
  var a = arguments[0];
  var sum = 0;
  for(var i = 0; i < 10000; i++) {
    for(var n = 0; n < 1000; n++) {
      sum += n;
    }
  }
}
test();
 pending…
access to callee
 
function test() {
  var fn = arguments.callee;
  var sum = 0;
  for(var i = 0; i < 10000; i++) {
    for(var n = 0; n < 1000; n++) {
      sum += n;
    }
  }
}
test();
 pending…
access to length
 
function test() {
  var num = arguments.length;
  var sum = 0;
  for(var i = 0; i < 10000; i++) {
    for(var n = 0; n < 1000; n++) {
      sum += n;
    }
  }
}
test();
 pending…
No arguments (reference)
 
function test() {
  var sum = 0;
  for(var i = 0; i < 10000; i++) {
    for(var n = 0; n < 1000; n++) {
      sum += n;
    }
  }
}
test();
 pending…
eval is here (reference)
 
function test() {
  eval('');
  var sum = 0;
  for(var i = 0; i < 10000; i++) {
    for(var n = 0; n < 1000; n++) {
      sum += n;
    }
  }
}
test();
 pending…

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