Bug 68784 - DFG static prediction code is no longer needed and should be removed
Summary: DFG static prediction code is no longer needed and should be removed
Status: RESOLVED FIXED
Alias: None
Product: WebKit
Classification: Unclassified
Component: JavaScriptCore (show other bugs)
Version: 528+ (Nightly build)
Hardware: All All
: P2 Normal
Assignee: Nobody
URL:
Keywords:
Depends on:
Blocks: 68593
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Reported: 2011-09-25 17:47 PDT by Filip Pizlo
Modified: 2011-09-25 19:24 PDT (History)
2 users (show)

See Also:

Attachments
the patch (63.88 KB, patch)
2011-09-25 18:08 PDT, Filip Pizlo 		oliver: review+
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Description Filip Pizlo 2011-09-25 17:47:23 PDT 
The DFG originally used static predictions to drive speculation and optimization.  But now the DFG has value profiles, rare case profiles, and the old JIT's structure stub infos and method call link infos to dynamic predictions, which have been found to do a better job of driving speculation and optimization.  At this point, the static prediction code is just getting in the way and should be removed.
Comment 1 Filip Pizlo 2011-09-25 18:08:35 PDT 
Created attachment 108619 [details]
the patch
Comment 2 Filip Pizlo 2011-09-25 19:24:28 PDT 
Landed in r95930.