Bug ID: 30717
           Summary: Exhange instruction uses two different sized registers
           Product: libraries
           Version: 3.9
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
    Classification: Unclassified

When the 0x66 prefix is present, two differently sized registers are used by
the decoded xchg instruction. Here's an example decoded with LLVM:

Bytes: 66 94
Output: xchgl %sp, %eax

The second operand should be %ax.

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