RESOLVED FIXED 65234
DFG graph has no notion of double prediction 
https://bugs.webkit.org/show_bug.cgi?id=65234
Summary DFG graph has no notion of double prediction
Filip Pizlo
Reported 2011-07-26 23:24:34 PDT
The DFG graph has notions of Int32, cell, and array predictions, but no notion of double prediction. Furthermore, it has no notion of the least-upper-bound of predictions, or of distinguishing between a top prediction (where we know that the node can have every type because we've got confirmed sightings of assignments of all of the different types) and a bottom prediction (we have no information pointing in the direction of any particular type).
Attachments
the patch (10.69 KB, patch)
2011-07-26 23:46 PDT, Filip Pizlo 		no flags
DetailsFormatted DiffDiff
View All Add attachment proposed patch, testcase, etc.
Filip Pizlo
Comment 1 2011-07-26 23:46:35 PDT
Created attachment 102097 [details] the patch This is performance-neutral, but shows sights of slight speed-ups in Kraken. It's meant as a stepping stone for other optimizations which would otherwise cause slow-downs due to overzealous int speculation.
WebKit Review Bot
Comment 2 2011-07-27 20:25:32 PDT
Comment on attachment 102097 [details] the patch Clearing flags on attachment: 102097 Committed r91894: <http://trac.webkit.org/changeset/91894>
WebKit Review Bot
Comment 3 2011-07-27 20:25:36 PDT
All reviewed patches have been landed. Closing bug.
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