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Run results for: bitwise operator vs. boolean logic when using TypedArrays

Bitwise operators are slow in javascript because there is implicit type conversion between floats and ints. If we use TypedArrays though, javascript engines shouldn't have to convert. But do they? This test is here to find out. We'll also check to see whether conversion is performed between another int-like datatypes, Uint32

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36
Chrome 66
Mac OS X 10.13.3
Other
6 years ago
Test name Executions per second
bitwise operator on Int32Array 345.1 Ops/sec
boolean operator on Int32Array 339.0 Ops/sec
boolean operator with comparitors on Int32Array 348.3 Ops/sec
bitwise operator on Float32Array 342.8 Ops/sec
bitwise operator on Uint32Array 345.9 Ops/sec
boolean operator on Uint32Array 347.7 Ops/sec
boolean operator on Uint32Array with comparators 342.1 Ops/sec
Script Preparation code:
AخA
 
var i32 = new Int32Array(10000);
var f32 = new Float32Array(10000);
var ui32 = new Uint32Array(10000);
Tests:

  • bitwise operator on Int32Array

     
    for(var i=0; i<i32.length; ++i){ i32[i] = i32[i] | i32[i]; }

  • boolean operator on Int32Array

     
    for(var i=0; i<i32.length; ++i){ i32[i] = i32[i] || i32[i]; }

  • boolean operator with comparitors on Int32Array

     
    for(var i=0; i<i32.length; ++i){ i32[i] = (i32[i]==1) || (i32[i]==1)? 1:0; }

  • bitwise operator on Float32Array

     
    for(var i=0; i<f32.length; ++i){ f32[i] = f32[i] | f32[i]; }

  • bitwise operator on Uint32Array

     
    for(var i=0; i<ui32.length; ++i){ ui32[i] = ui32[i] | ui32[i]; }

  • boolean operator on Uint32Array

     
    for(var i=0; i<ui32.length; ++i){ ui32[i] = ui32[i] || ui32[i]; }

  • boolean operator on Uint32Array with comparators

     
    for(var i=0; i<ui32.length; ++i){ ui32[i] = (ui32[i]==1) || (ui32[i]==1)? 1:0; }