Bug 154828

Summary: B3::fixSSA() has problems in Octane/regexp
Product: WebKit Reporter: Filip Pizlo <fpizlo>
Component: JavaScriptCoreAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: ngockhanhlam87
Priority: P2    
Version: WebKit Nightly Build   
Hardware: All   
OS: All   
Bug Depends on:    
Bug Blocks: 154319    
Attachments:
Description Flags
fixSSA going nuts according to Instruments none

Filip Pizlo
Reported 2016-02-29 11:41:50 PST
Usually you know that everything is OK when the compiler spends 95% of its time in IRC. But in Octane/regexp, this is not the case! We spent lots of time in fixSSA() instead. That usually means a scalability problem in that phase. I've known for a while now that our SSA conversion has scalability problems, and it looks like we're now seeing this. Note: I don't think that this is actually bottlenecking Octane/regexp performance. So it's not a high priority right now.
Attachments
fixSSA going nuts according to Instruments (493.21 KB, image/png)
2016-02-29 11:46 PST, Filip Pizlo 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Filip Pizlo
Comment 1 2016-02-29 11:46:23 PST
Created attachment 272507 [details] fixSSA going nuts according to Instruments
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