[Bug binutils/19722] [libopcodes] [Aarch64] Undefined SIMD instruction not marked undefined

[nickc at redhat dot com]

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

--- Comment #3 from Nick Clifton <nickc at redhat dot com> ---
Hi Nathan,

> I'm not assembling this instruction, I am disassembling it from raw bytes.

Ah - OK - that makes sense.  I am not sure if it is really worth fixing this
problem though.  It would take a lot of effort to add code to check for all the
possible undefined instructions in the AArch64 disassembler.  I know that there
already is code to display instructions whose binaries are completely
unrecognised, but that is different.  At the moment the disassembler does not
have any code to detect illegal/undefined forms of recognised instructions, and
adding that code would take a lot of time, and probably introduce new bugs.

Cheers
  Nick

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