[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 #1 from Oliver Hunt <oliver at apple.com> ---
Let's try again with the same function in both
function f(j) { for (var i = 0 ; i < 10000000; i++) j = (j ?  j * i : 1) ^ (i & j); }; var start = new Date; f(1); var end = new Date; print("1st: " + (end - start) + "ms"); var start = new Date; f(1); var end = new Date; print("2nd: " + (end - start) + "ms")
1st: 30
2nd: 23ms

If we do it again, without passing a parameter we get:
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("1st: " + (end - start) + "ms"); 
var start = new Date; f(); var end = new Date; print("2nd: " + (end - start) + "ms")

1st: 11919ms
2nd: 29ms

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