A Linux system running over JavaScript [LWN.net]

A Linux system running over JavaScript

Posted May 18, 2011 16:22 UTC (Wed) by nlucas (subscriber, #33793)
In reply to: A Linux system running over JavaScript by przemoc
Parent article: A Linux system running over JavaScript

They seem to have identified the problem as a bug on the javascript optimization compiler:

http://code.google.com/p/v8/issues/detail?id=1394#c2

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A Linux system running over JavaScript

Posted May 26, 2011 7:18 UTC (Thu) by przemoc (guest, #67594) [Link]

Just a follow-up.

http://codereview.chromium.org/7037023

It's theoretically addressing v8 issue 1394, but in fact it's more about Chromium issue 82828. The problem of v12/13 was just briefly mentioned in "PC emulator is about 2 times slower using V8 than Jaeger Monkey" report and did not have deserving separate issue in v8 project.

> Fix bug in optimized compiler's switch-statement.
>
> In the case where the default-clause occurs as the first clause, the case-blocks were not wired up correctly.

So it was a matter of extracting non-NULL check equivalently from if block into inner if. That shouldn't be really needed in obtaining correct behavior though...

Speed deficiency (when compared to Fx) remains for the time being.