Absolute value speed

JavaScript performance comparison

Revision 3 of this test case created by Solenoid

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    function abs(n){
    return n < 0 ? -n : n;
    }
   
    function abs2(n){
    return (n^(n>>31))-(n>>31);
    }
};

Benchmark.prototype.teardown = function() {
    var a = 2, b = -3, c = 0
};
</script>

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Testing in unknown unknown
Test Ops/sec
Math
Math.abs(a);
Math.abs(b);
Math.abs(c);
pending…
Function
abs(a);
abs(b);
abs(c);
pending…
Bitwise
abs2(a);
abs2(b);
abs2(c);
pending…

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Revisions

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2 comments

Solenoid (revision owner) commented :

Could not test bitwise absolute function, gave me "TypeError: Cannot call method 'call' of undefined."

function abs2(n) { return ((n>>31)^n)–(n>>31); }

Solenoid (revision owner) commented :

Never mind, copy-paste contained a white space character.

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