Bug 142921

Summary: DFG IR should represent the various of effects of put_by_id in a single node
Product: WebKit Reporter: Filip Pizlo <fpizlo>
Component: JavaScriptCoreAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal    
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: All   
OS: All   
Bug Depends on: 142920    
Bug Blocks:    

Description Filip Pizlo 2015-03-20 14:20:09 PDT
Currently put_by_id may turn into a three-node lowering: AllocatePropertyStorage, PutByOffset, PutStructure.  This barely works.  We should use a single node ("PutByOffsetWithPropertyAllocationTransition", or something with a shorter name) so that code motion of things that GC and exit doesn't have to tiptoe around this.
Comment 1 Filip Pizlo 2015-03-20 15:03:37 PDT
An alternate approach might be: https://bugs.webkit.org/show_bug.cgi?id=142924