Run results for: Inverse square root

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3321.0 Safari/537.36

Browser: Chrome 65

Operating system: Mac OS X 10.10.1

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
Traditional square root	278.1 Ops/sec
Fast square root	118.6 Ops/sec

Script Preparation code:

var fArr = new Float32Array(1);
var iArr = new Int32Array(fArr.buffer);
function fsr(n) {
	fArr[0] = n;
	iArr[0] = 0x5f375a86 - ( iArr[0] >> 1 );
	fArr[0] = fArr[0] * (1.5 - (n * 0.5) * fArr[0] * fArr[0]);
	return fArr[0];
}

Tests:

Traditional square root
var sqroots = []; for (var i = 0; i < 5000; i++) { sqroots.push(Math.sqrt(Math.random()*i)); }
Fast square root
var sqroots = []; for (var i = 0; i < 5000; i++) { sqroots.push(fsr(Math.random()*i)); }

Run results for: Inverse square root

Traditional square root

Fast square root