[Webkit-unassigned] [Bug 142036] New: DFG SSA stack accesses shouldn't speak of VariableAccessDatas

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Feb 25 18:54:48 PST 2015


https://bugs.webkit.org/show_bug.cgi?id=142036

            Bug ID: 142036
           Summary: DFG SSA stack accesses shouldn't speak of
                    VariableAccessDatas
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

VariableAccessData is super useful in ThreadedCPS because it allows us to region about things that span basic blocks.  It also allows us to do stepwise type inference on variables.  But it's purely harmful in SSA.  SSA shouldn't speak of it.

The main effect of this is that it will allow us to easily introduce new stack accesses.

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