Bug 64759

Summary:

DFG JIT does not optimize strict equality as effectively as the old JIT does

Product:

WebKit

Reporter:

Filip Pizlo <fpizlo>

Component:

JavaScriptCore

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED FIXED

Severity:

Normal

CC:

barraclough, fpizlo, webkit.review.bot

Priority:

Version:

528+ (Nightly build)

Hardware:

All

OS:

All

Attachments:

Description	Flags
the patch	none

Description Filip Pizlo 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.

Comment 1 Filip Pizlo 2011-07-18 15:18:54 PDT

Created attachment 101218 [details]
the patch

Comment 2 WebKit Review Bot 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>

Comment 3 WebKit Review Bot 2011-07-18 17:36:54 PDT

All reviewed patches have been landed.  Closing bug.