V2 [PATCH] x86: Add {disp16} pseudo prefix

[Jan Beulich]

On 31.07.2020 13:52, H.J. Lu wrote:
> On Fri, Jul 31, 2020 at 12:03 AM Jan Beulich <jbeulich@suse.com> wrote:
>>
>> On 30.07.2020 01:39, H.J. Lu wrote:
>>> Here is the updated patch.
>>
>> Just one more thing: Wouldn't it make sense to mark {disp16} CpuNo64,
>> at least as long as it's not usable for controlling branch displacements
>> (which, as said, I think it shouldn't get enabled for)?
> 
> Since {disp16} can only be used for memory reference in 16-bit mode,
> CpuNo64 isn't appropriate here.

Wouldn't the diagnostic be more to the point? (The prefix isn't limited
to 16-bit mode, but to 16-bit addressing, which can also be used from
32-bit mode, but not from 64-bit mode.)

Jan