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Re: [Xen-devel] [PATCH 1/2] x86emul: fix vector-length check for AVX512F scalar fused-multiply-add insns
- To: Jan Beulich <JBeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 10 Dec 2018 14:26:04 +0000
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 10 Dec 2018 14:26:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 10/12/2018 14:11, Jan Beulich wrote:
>>>> On 10.12.18 at 14:50, <andrew.cooper3@xxxxxxxxxx> wrote:
>> On 07/12/2018 11:17, Jan Beulich wrote:
>>> The check needs to happen whenever EVEX.b is clear, not just in the
>>> memory operand case.
>> EVEX.b is a different field to EVEX.br
>>
>> I'm afraid that this goes back to my original concern with the series.
>> Having the fields named differently between our code and the manual is
>> now causing problems for everyone.
> I'm trying to be very strict with distinguishing things in text:
> EVEX.B is what in code we call evex.b; EVEX.b is what in code
> we call evex.br. There's no such thing as EVEX.br. I strictly
> mean to make the textual (outside of code) distinction via
> case: EVEX is to be used with SDM names, evex with our code's
> ones.
>
> I thought we had meanwhile settled this dispute, realizing
> that there simply is no really good way of naming things in
> code without some (undesirable) deviation from the SDM.
The fact that we don't have a better option does not mean that the
confusion has stopped. The fact that there are one and a half people in
the world who can read this code means that it will keep being a problem
until we find some better option.
As for this patch, this is the first time I've (knowingly) encountered
your scheme for disambiguation. I've not (knowingly) seen it written
down or pointed out anywhere.
Basically - the commit message and the patch content contradict each
other, and it is not reasonable to expect readers to know that EVEX in
the commit message bears no relationship to evex in the code.
~Andrew
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