https://bugs.kde.org/show_bug.cgi?id=384230

--- Comment #16 from Tom Hughes <t...@compton.nu> ---
Were not actually daft you know and I did check the Intel manual multiple
times. To be clear I believe this quote covers it:

"The address-size override prefix (67H) allows programs to switch between 16-
and 32-bit addressing. Either size can be the default; the prefix selects the
non-default size. Using this prefix and/or other undefined opcodes when
operands for the instruction do not reside in memory is reserved; such use may
cause unpredictable behavior."

In this case the only operand to the instruction is an immediate offset encoded
as part of the instruction, which does not "reside in memory" and as such this
use of the prefix constitutes a reserved instruction and using it may cause
"unpredictable behaviour".

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