asm-js

JavaScript performance comparison

Revision 5 of this test case created

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 fast = DiagModule(window);

function DiagModule2(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 slow = DiagModule2(bogusGlobal); // produces purely-interpreted version
</script>

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

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