Bug 170569

Summary: Linear scan should run liveness only once
Product: WebKit Reporter: Filip Pizlo <fpizlo>
Component: JavaScriptCoreAssignee: Filip Pizlo <fpizlo>
Status: RESOLVED FIXED    
Severity: Normal CC: benjamin, buildbot, cdumez, cmarcelo, dbates, ggaren, jfbastien, keith_miller, mark.lam, msaboff, saam
Priority: P2    
Version: WebKit Nightly Build   
Hardware: All   
OS: All   
Attachments:
Description Flags
it's a start
none
the patch keith_miller: review+

Description Filip Pizlo 2017-04-06 15:01:13 PDT 
Patch forthcoming.
Comment 1 Filip Pizlo 2017-04-06 15:01:50 PDT 
Created attachment 306430 [details]
it's a start
Comment 2 Filip Pizlo 2017-04-06 16:50:27 PDT 
Created attachment 306437 [details]
the patch

another 10% -O1 compile time speed-up
Comment 3 Filip Pizlo 2017-04-06 17:06:57 PDT 
(In reply to Filip Pizlo from comment #2)
> Created attachment 306437 [details]
> the patch
> 
> another 10% -O1 compile time speed-up

Actually, further testing shows that it's only a 6% speed-up.  Still good though.
Comment 4 Keith Miller 2017-04-06 17:09:33 PDT 
Comment on attachment 306437 [details]
the patch

r=me.
Comment 5 Filip Pizlo 2017-04-06 17:11:39 PDT 
Landed in https://trac.webkit.org/changeset/215071/webkit