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

[Jan Beulich]

On 04.03.2020 12:44, H.J. Lu wrote:
> 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.

Actually they were there, in patch 2. I've moved them to this patch
and have just sent v1.1 for just this one patch.

Jan