Run results for: copyWithin: is it fast in Uint32Array

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:133.0) Gecko/20100101 Firefox/133.0

Browser: Firefox 133

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

UInt32Array copyWithin

29.3M/s

UInt32Array Iteration copy

7.1M/s

View exact numbers

Test name	Executions per second
✓ UInt32Array copyWithin	29,312,508 Ops/sec
UInt32Array Iteration copy	7,130,177 Ops/sec

Script Preparation code:

var buffer = new Uint32Array(1024*1024);
for(var i=0; i< buffer.length; i++) {
    buffer[i] = Math.round(Math.random() * 256);                          
}

Tests:

UInt32Array Iteration copy
var start = 100; var length = 200; var copyToPos = 1000; for(var i=0; i< length; i++) { buffer[copyToPos++] = buffer[start + i] }
UInt32Array copyWithin
var start = 100; var length = 200; var copyToPos = 1000; buffer.copyWithin(copyToPos, start, start + length);

Run results for: copyWithin: is it fast in Uint32Array

Comparing the performance between iteration and copyWithin in Uint32Array

UInt32Array Iteration copy

UInt32Array copyWithin