Run results for: acos vs atan

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.128 Safari/537.36 Edg/89.0.774.77

Browser: Chrome 89

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
acos	1.5 Ops/sec
atan	2.9 Ops/sec

HTML Preparation code:

acos vs atan

Script Preparation code:

var N = 1000000;
var x = new Float32Array(N);
var y = new Float32Array(N);

for (var i = 0; i < N; ++i ) {
	x[i] = 100* Math.random();
	y[i] = 100* Math.random();
}

Tests:

acos
for (var i = 0; i < N; ++i) { Math.acos(x[i] / Math.sqrt(x[i]*x[i] + y[i]*y[i])); }
atan
for (var i = 0; i < N; ++i) { Math.atan(x[i], y[i]); }