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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_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36
Chrome 53
Mac OS X 10.11.6
Other
8 years ago
Test name Executions per second
bitwise operator on Int32Array 295.0 Ops/sec
boolean operator on Int32Array 293.8 Ops/sec
boolean operator with comparitors on Int32Array 289.6 Ops/sec
bitwise operator on Float32Array 284.6 Ops/sec
bitwise operator on Uint32Array 295.3 Ops/sec
boolean operator on Uint32Array 294.0 Ops/sec
boolean operator on Uint32Array with comparators 289.8 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; }