Function log

test/fixtures/compile-performance.js:61968–61979

(x)

            return n === 0 ? acc : n % 2 === 1 ? pow(x, n - 1, acc * x) : pow(x * x, n / 2, acc);
        };
        var log = function(x){
            var n  = 0
                , x2 = x;
            while(x2 >= 4096){
                n += 12;
                x2 /= 4096;
            }
            while(x2 >= 2){
                n  += 1;
                x2 /= 2;
            } return n;
        };

        $export($export.P + $export.F * (!!$toFixed && (
                0.00008.toFixed(3) !== '0.000' ||