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Run results for:
(new)? DataView or BitTwiddling for Reads
Is DataView faster than directly bit twiddling?
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<iframe src="https://measurethat.net/Embed?id=615822" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36
Browser:
Chrome 139
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
11 months ago
DataView, Aligned
13.3M/s
Bit Twiddling, Aligned
13.2M/s
new DataView, Aligned
9.8M/s
View exact numbers
Test name
Executions per second
✓
DataView, Aligned
13,292,502 Ops/sec
Bit Twiddling, Aligned
13,185,924 Ops/sec
new DataView, Aligned
9,795,018 Ops/sec
Script Preparation code:
let buf = new ArrayBuffer(12); u32s = new Uint32Array(buf); u8s = new Uint8Array(buf); dv = new DataView(buf); offset = 0; sum = 0;
Tests:
Bit Twiddling, Aligned
sum += ((u8s[offset] << 24) | (u8s[offset + 1] << 16) | (u8s[offset + 2] << 8) | u8s[offset + 3]) | 0;
DataView, Aligned
sum += dv.getInt32(offset, false);
new DataView, Aligned
sum += (new DataView(buf)).getInt32(offset, false);