floor abs.js

var _abs = Math.abs;
var _floor = Math.floor;
var _rand = Math.random;

_speedTest(
  [
    function(n)
    {
      var i = n; while(i--)
      {
        var a = 100*_rand();
        a = a|0;
        if(a < 0) a = -a;
      }    
    },
    function(n)
    {
      var i = n; while(i--)
      {
        var a = 100*_rand();
        a = (a^(a >> 31)) - (a >> 31);
      }    
    },
    function(n)
    {
      var i = n; while(i--)
      {
        var a = 100*_rand();
        a = _abs(a)|0;
      }    
    },
    function(n)
    {
      var i = n; while(i--)
      {
        var a = 100*_rand();
        a = _floor(_abs(a));
      }    
    }    
  ],
  100000000
);

/*
chrome 5 10000000
0: 1832 ms
1: 2536 ms
2: 2511 ms
3: 3087 ms

ff3.6 1000000
0: 1194 ms
1: 1902 ms
2: 1223 ms
3: 1155 ms

opera 10.60 5000000
0: 1427 ms
1: 1451 ms
2: 2529 ms
3: 2894 ms

ie7 1000000
0: 3204 ms
1: 3405 ms
2: 5698 ms
3: 8543 ms

*/