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Re: [Xen-devel] [PATCH] x86 emulation: fix bswap

>>> Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> 15.02.07 11:33 >>>
>On 15/2/07 10:22, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:
>> REX.R needs to be decoded and since bswap on a 16-bit operand is undefined,
>> it is best to have hardware execute this so the emulation result matches
>> hardware behavior. Since it is simple to do, faster, and smaller, also let
>> hardware do 32- and 64-bit ones.
>Can 'undefined' behaviour include e.g. #UD?

I don't think so.


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