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List:       fedora-devel-list
Subject:    Re: Fedora 32 System-Wide Change proposal: x86-64 micro-architecture update
From:       Kevin Kofler <kevin.kofler () chello ! at>
Date:       2019-07-31 8:59:38
Message-ID: qhrl9r$2gsp$1 () blaine ! gmane ! org
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Panu Matilainen wrote:
> This proposal seems mostly like an experiment in disguise to find out
> whether the Fedora developers can agree on *something*,

This also looks to me like the tactic to ask for the moon to get a 
"compromise" that is still unacceptable.

> and quite clearly the answer is yes, at least this once we can all agree
> to disagree with the proposed change.

I disagree with ANY raised vector instruction requirement, considering that:
* it would make Fedora incompatible with some hardware out there,
* the performance increase to be had is marginal, given that we are mostly
  talking about code written in C or C++ without even compiler vectorization
  (-ftree-vectorize) turned on,
* there are already mechanisms for runtime feature detection, which are
  already widely used in those few packages that can actually benefit from
  the vector instructions (because they are performance-sensitive and
  because they have handwritten assembly or vector intrinsics code),
* upstreams still widely support SSE2, so I don't see a burden for
  maintainers to keep it going (unlike the case of pre-SSE2 32-bit x86 where
  a few upstreams had dropped support).

        Kevin Kofler
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