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Run results for:
(new)? DataView or BitTwiddling for Reads
Is DataView faster than directly bit twiddling?
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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:
8 months ago
Test name
Executions per second
Bit Twiddling, Aligned
13185924.0 Ops/sec
DataView, Aligned
13292502.0 Ops/sec
new DataView, Aligned
9795018.0 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);