MeasureThat.net

Run results for: Coordinate test 5

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36
Chrome 75
Mac OS X 10.14.5
Desktop
5 years ago
Test name Executions per second
Conditional comparison 3606998.0 Ops/sec
Bitwise comparison 2846421.8 Ops/sec
Other test 2385217.0 Ops/sec
Other test 2 2833298.5 Ops/sec
Other test 3 2834286.8 Ops/sec
Other test 4 3475396.2 Ops/sec
Script Preparation code:
AخA
 
var width = 480;
var halfWidth = width >> 1;
var invertedHalfWidth = 1 / halfWidth;
Tests:

  • Conditional comparison

     
    var xPos = Math.random() * width;
    var xQuadLeft = xPos < halfWidth ? 0 : 1;

  • Bitwise comparison

     
    var xPos = Math.random() * width;
    var diff = xPos ^ halfWidth;
    diff |= diff >> 1;
    diff |= diff >> 2;
    diff |= diff >> 4;
    diff |= diff >> 8;
    diff |= diff >> 16;
    diff &= ~(diff >> 1) | 0x80000000;
    diff &= (xPos ^ 0x80000000) & (halfWidth ^ 0x7fffffff);
    var xQuad = !!diff;

  • Other test

     
    var xPos = Math.random() * width;
    var xQuad = xPos ^ halfWidth && (
                   !(halfWidth ^ 0) ||
                   ( (xPos / halfWidth) | 0 )
               );

  • Other test 2

     
    var xPos = Math.random() * width;
    var xQuad = xPos == width ? 1 : ( ( xPos * invertedHalfWidth ) | 0 );

  • Other test 3

     
    var xPos = Math.random() * width;
    var xQuad = xPos == width ? 1 : ~~( xPos * invertedHalfWidth );

  • Other test 4

     
    var xPos = Math.random() * width;
    var xQuad = ~~( xPos * invertedHalfWidth );