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azu/gist:72842

Created March 2, 2009 16:28
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gistfile1.js
// 絶対値はMath.absよりシフト演算の方が早い
// http://actionscript.g.hatena.ne.jp/ConquestArrow/20070621/1182359767
abs = function(x){
return (x ^ (x >> 31)) - (x >> 31);
};
console.time("1");
for(i=0;i<100000;i++){
abs(-i);
}
console.timeEnd("1")
console.time("2");
for(j=0;j<100000;j++){
Math.abs(-j);
}
console.timeEnd("2")
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