asm-js

JavaScript performance comparison

Test case created and last updated

Preparation code

<script>
function DiagModule(stdlib) {
    "use asm";

    var sqrt = stdlib.Math.sqrt;

    function square(x) {
        x = +x;
        return +(x*x);
    }

    function diag(x, y) {
        x = +x;
        y = +y;
        return +sqrt(square(x) + square(y));
    }

    return { diag: diag };
}

var bogusGlobal = {
    Math: {
        sqrt: function(x) { return x * 2; }
    }
};

var fast = DiagModule(window);
var slow = DiagModule(bogusGlobal); // produces purely-interpreted version
</script>

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
fast
fast.diag(3, 4)
pending…
slow
slow.diag(3, 4);       // 50
pending…

Compare results of other browsers

Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

1 comment

Nameless commented :

TypeError: asm.js link error: As a temporary limitation, modules cannot be linked more than once. This limitation should be removed in a future release. To work around this, compile a second module (e.g., using the Function constructor). @ http://jsperf.com/asm-js

So this benchmark is completely bogus right now.

Add a comment