[Webkit-unassigned] [Bug 155551] Pathological performance on first execution of a function called with mismatched argument count

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=155551

--- Comment #4 from Oliver Hunt <oliver at apple.com> ---
Here's the case that originally struct me as wrong:

function f(j) { for (var i = 0 ; i < 10000000; i++) j = (j ?  j * i : 1) ^ (i & j); };

var start = new Date; f(); var end = new Date; print("2nd: " + (end - start) + "ms");
var start = new Date; f(); var end = new Date; print("3rd: " + (end - start) + "ms");

First run is 433ms, second run is 137ms.

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