http://sourceware.org/bugzilla/show_bug.cgi?id=13668

--- Comment #2 from Mark Seaborn <m...@mythic-beasts.com> 2012-02-10 17:08:55 
UTC ---
Yes, you're right.  I was testing on an Intel machine.  When I tested on an AMD
machine, it produced:

$ gcc test.c -o test -m64 && ./test
operand size is 2 bytes

It looks like Intel failed to copy AMD in this regard.  The Intel docs
implicitly acknowledge this and say that the behaviour of this instruction is
not specified.

Ideally objdump's disassembler would treat this byte sequence as undefined.

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