Benchmark: Math.pow(2,n) vs Table lookup vs bitwise

Script Preparation code:

var POWERS = [
		1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768,65536,131072,262144,524288,1048576,2097152,4194304,8388608,16777216,33554432
];

Tests:

Table lookup
let cnt = POWERS.length; let x; for(let i =0;i<cnt;i++){ x = POWERS[i]; }
Math.pow
let cnt = POWERS.length; let x; for(let i =0;i<cnt;i++){ x = Math.pow(2,i); }
bitwise (1 << n)
let cnt = POWERS.length; let x; for(let i =0;i<cnt;i++){ x = (1 << i); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Table lookup
Math.pow
bitwise (1 << n)

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Linux; Android 13) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 113 on Android

View result in a separate tab

Test name	Executions per second
Table lookup	273325.5 Ops/sec
Math.pow	145618.7 Ops/sec
bitwise (1 << n)	6254165.0 Ops/sec

Math.pow(2,n) vs Table lookup vs bitwise (version: 0)

Which is faster: Table lookup or Math.pow(2,value) or bitwise operation (1 << value)?

Comparing performance of: Table lookup vs Math.pow vs bitwise (1 << n)

Created: one year ago by: Guest

Jump to the latest result

Table lookup

Math.pow

bitwise (1 << n)

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A