[Webkit-unassigned] [Bug 63665] New: X86Assembler does not encode byte registers in 64-bit mode correctly.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=63665

           Summary: X86Assembler does not encode byte registers in 64-bit
                    mode correctly.
           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 JSC 64-bit JITs expect to be able to use any GPR as a byte register in 64-bit mode.  But this does not work for sil, dil, spl, or bpl, because the X86Assembler fails to emit a blank REX (a REX with no bits set).

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