[Webkit-unassigned] [Bug 141398] New: DFG call codegen should resolve the callee operand as late as possible

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=141398

            Bug ID: 141398
           Summary: DFG call codegen should resolve the callee operand as
                    late as possible
    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

This will make it easier to structure https://bugs.webkit.org/show_bug.cgi?id=141332.  I want to do this separately to make sure that there aren't any hidden gremlins in the ordering.  Intuitively, this change shouldn't affect performance, although the only hypothetical cases I can think of where codegen would be affected, this change would be a progression.  Right now in trunk we lock down the register for the callee before doing anything else, and so we might spill one of the arguments to do this.  Then we would have to refill the argument into something else.  With this change, we get at the callee last, so the argument would stay in a register.  We might spill and refill the callee in the process with this change, but in any case where such a conflict occured, then without the change we would be spilling and then filling some argument.

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