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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Pathological performance on first execution of a function called with mismatched argument count"
href="https://bugs.webkit.org/show_bug.cgi?id=155551#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Pathological performance on first execution of a function called with mismatched argument count"
href="https://bugs.webkit.org/show_bug.cgi?id=155551">bug 155551</a>
from <span class="vcard"><a class="email" href="mailto:oliver@apple.com" title="Oliver Hunt <oliver@apple.com>"> <span class="fn">Oliver Hunt</span></a>
</span></b>
<pre>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</pre>
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