Bug 64759

Summary: DFG JIT does not optimize strict equality as effectively as the old JIT does
Product: WebKit Reporter: Filip Pizlo <fpizlo>
Component: JavaScriptCoreAssignee: Nobody <webkit-unassigned>
Status: RESOLVED FIXED    
Severity: Normal CC: barraclough, fpizlo, webkit.review.bot
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: All   
OS: All   
Attachments:
Description Flags
the patch none

Filip Pizlo
Reported 2011-07-18 15:13:36 PDT
The old JSC JIT optimizes strict equality (===) by having a fast path for when one operand is not a cell, and neither operand is a number. The DFG JIT only has fast-path optimizations for strict equality that speculate that both operands are integers. The DFG JIT should have similar optimizations to the old JIT for strict equality.
Attachments
the patch (12.00 KB, patch)
2011-07-18 15:18 PDT, Filip Pizlo 		no flags
DetailsFormatted DiffDiff
View All Add attachment proposed patch, testcase, etc.
Filip Pizlo
Comment 1 2011-07-18 15:18:54 PDT
Created attachment 101218 [details] the patch
WebKit Review Bot
Comment 2 2011-07-18 17:36:50 PDT
Comment on attachment 101218 [details] the patch Clearing flags on attachment: 101218 Committed r91226: <http://trac.webkit.org/changeset/91226>
WebKit Review Bot
Comment 3 2011-07-18 17:36:54 PDT
All reviewed patches have been landed. Closing bug.
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