Re: [PATCH 1/9] x86: refine TPAUSE and UMWAIT

["H.J. Lu" <hjl dot tools at gmail dot com>]

On Wed, Mar 4, 2020 at 3:40 AM Jan Beulich <jbeulich@suse.com> wrote:
>
> On 04.03.2020 12:36, H.J. Lu wrote:
> > On Wed, Mar 4, 2020 at 1:37 AM Jan Beulich <jbeulich@suse.com> wrote:
> >>
> >> Allowing 64-bit registers is misleading here: Elsewhere these get allowed
> >> when there's no difference between either variant, because of 32-bit
> >> destination registers having their upper halves zeroed in 64-bit mode.
> >> Here, however, they're source registers, and hence specifying 64-bit
> >> registers would lead to the ambiguity of whether the upper 32 bits
> >> actually matter.
> >>
> >> Additionally, for proper code generation in 16-bit mode, IgnoreSize is
> >> needed on both.
> >
> > Are there testcases to show IgnoreSize is needed on them?
>
> The situation with 16-bit test cases is rather poor anyway. I didn't
> consider it reasonable to add such very special ones when far more
> general ones don't exist. But if your question is to mean you demand

Let's start from somewhere.

> such to be added, then I'll (somewhat hesitantly) add/extend some.
> Please clarify.

Please add testcases.

Thanks.

-- 
H.J.