[Webkit-unassigned] [Bug 69722] New: Remove unused callOperation code of DFG JIT on X86

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Sun Oct 9 05:07:18 PDT 2011


           Summary: Remove unused callOperation code of DFG JIT on X86
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: yuqiang.xian at intel.com
                CC: barraclough at apple.com, fpizlo at apple.com

We'll never reach callOperation(*EJJJ*) on X86 because it requires 6 GPRs while currently DFG JIT on X86 only provides 5 GPRs. For those operations which require 3 or more JSValue arguments (like instanceof) we spill the registers and load the data into registers on demand, push the parameters and directly invoke appendCall. Removing the unused callOperation code avoids some confusions.

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