https://sourceware.org/bugzilla/show_bug.cgi?id=19722

--- Comment #4 from njholcomb at wi dot rr.com ---
This may not be a valid output from the libopcodes disassembler, but there are
a lot of tools out there, and not all of them may produce expected
instructions. People can also edit binaries themselves, placing arbitrary
bytes. Furthermore, this instruction executes without any signal on at least
one chip, where it both loads a word into x6 and applies the post-fix after
loading in the word, a completely unspecified (though maybe predictable)
behavior. Identifying invalid instructions like this is essential to debugging
code that behaves unexpectedly.

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