[llvm-bugs] [Bug 32806] New: [x86 disassembler] Invalid used of 'w' suffix on push and pop using 64-bit registers

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https://bugs.llvm.org/show_bug.cgi?id=32806

            Bug ID: 32806
           Summary: [x86 disassembler] Invalid used of 'w' suffix on push
                    and pop using 64-bit registers
           Product: libraries
           Version: 3.9
          Hardware: Other
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: MC
          Assignee: unassignedbugs at nondot.org
          Reporter: nholcomb at wisc.edu
                CC: llvm-bugs at lists.llvm.org

The following instruction accesses a 64-bit register, but the mnemonic
indicates that it is using a 16-bit register. I tried assembling the output of
LLVM using gas and got an error.

Bytes:          67 49 5e
Output:         popw %r14
Error from gas: incorrect register `%r14' used with `w' suffix
Expected:       popq %r14

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