[PATCH] x86: Support BHI_CTRL instruction

[Christian Ludloff]

On Thu, Jun 4, 2026 at 12:39 AM Jiang, Haochen <haochen.jiang@intel.com> wrote:
> > From: Christian Ludloff <ludloff@gmail.com>
> > Arguably RDSSP{D,Q} is a litmus test – can it REX2 or EVEX?
>
> I suppose it should be a REX2, not EVEX MAP4.

>From the perspective of the ISA, the W for D-vs-Q
can come from REX or REX2 or EVEX – it should
not matter which of the three encodings gets used
for RDSSP. If that is not the case, then please get
it documented too, together with IBHF behavior.

--
C.