[llvm-bugs] [Bug 30717] New: Exhange instruction uses two different sized registers

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30717

            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
          Assignee: unassignedbugs at nondot.org
          Reporter: nholcomb at wisc.edu
                CC: llvm-bugs at lists.llvm.org
    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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