Bug 68138

Summary:

DFG does not speculate aggressively enough on comparisons

Product:

WebKit

Reporter:

Filip Pizlo <fpizlo>

Component:

JavaScriptCore

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED FIXED

Severity:

Normal

CC:

aroben

Priority:

Version:

528+ (Nightly build)

Hardware:

All

OS:

All

Attachments:

Description	Flags
the patch	oliver: review+

Description Filip Pizlo 2011-09-14 20:58:47 PDT

DFG will emit slow-path code for peephole comparisons even if we have a double prediction.  For non-peephole double comparisons, we always take a slow path.

Comment 1 Filip Pizlo 2011-09-14 21:35:32 PDT

Created attachment 107451 [details]
the patch

75% speed-up on Kraken/ai-astar.

Comment 2 Filip Pizlo 2011-09-15 00:28:03 PDT

Landed in r95172

Comment 3 Adam Roben (:aroben) 2011-09-15 09:13:33 PDT

Clang build fix in http://trac.webkit.org/changeset/95194