[Webkit-unassigned] [Bug 63565] New: DFG non-speculative JIT does not reuse registers when compiling comparisons

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=63565

           Summary: DFG non-speculative JIT does not reuse registers when
                    compiling comparisons
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fpizlo at apple.com


The DFG JIT generally attempts to reuse argument registers for temporaries and results, particularly when there are obvious opportunities to do so.  The DFG non-speculative JIT fails to reuse registers when emitting code for comparisons.  Moreover, when it does reuse registers, it emits spurious and unnecessary zero-extend sequences even though the subsequent operation will perform zero-extension automatically.

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