[Webkit-unassigned] [Bug 171118] New: X86-64 aassembler doesn't handle xchg with byte register src

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Apr 21 10:29:50 PDT 2017


https://bugs.webkit.org/show_bug.cgi?id=171118

            Bug ID: 171118
           Summary: X86-64 aassembler doesn't handle xchg with byte
                    register src
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: ASSIGNED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: msaboff at apple.com

The Intel manual Vol 2A 3-3 shows that byte registers SPL and greater require a REX prefix byte.  The is done with the X86Assembler function oneByteOp8().  Use of that function was omitted when the xchg8_*() functions was added.

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