[Nasm-bugs] [Bug 3392676] New: cannot assemble CMPXCHG8B / CMPXCHG16B

[noreply-nasm at dev.nasm.us]

https://bugzilla.nasm.us/show_bug.cgi?id=3392676

            Bug ID: 3392676
           Summary: cannot assemble CMPXCHG8B / CMPXCHG16B
           Product: NASM
           Version: 2.14.xx
          Hardware: All
                OS: All
            Status: OPEN
          Severity: normal
          Priority: Medium
         Component: Assembler
          Assignee: nobody at nasm.us
          Reporter: xushengli at protonmail.com
                CC: chang.seok.bae at intel.com, gorcunov at gmail.com,
                    hpa at zytor.com, nasm-bugs at nasm.us
     Obtained from: Build from source archive using configure

The following instructions look legit to me, but cannot be assembled:

    CMPXCHG8B qword [rdi]
    CMPXCHG16B oword [edi]

Nasm says:

error: mismatch in operand sizes

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