[Bug binutils/19660] [libopcodes] [x86] REP prefixes shown incorrectly

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19660

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|---                         |WORKSFORME

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to njholcomb from comment #4)
> Coming back to this, my concern is that outputting instructions with
> prefixes where the prefixes cause the instruction to be undefined is
> misleading. If the output of the decoder is intended to match the
> instruction that will be executed, it should produce an error, because
> that's what will occur when the instruction is executed on a processor.

UD can happen for various reasons.  Because an AVX instruction is undefined
on Haswell machine, it doesn't mean objdump should decode it based on where
the program runs.

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