Bug 68784

Summary:

DFG static prediction code is no longer needed and should be removed

Product:

WebKit

Reporter:

Filip Pizlo <fpizlo>

Component:

JavaScriptCore

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED FIXED

Severity:

Normal

CC:

fpizlo, oliver

Priority:

Version:

528+ (Nightly build)

Hardware:

All

OS:

All

Bug Depends on:

Bug Blocks:

68593

Attachments:

Description	Flags
the patch	oliver: review+

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.