GNU bug report logs - #54635
[PATCH 0/5] Add wfmash

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Message #74 received at 54635 <at> debbugs.gnu.org (full text, mbox):

From: Efraim Flashner <efraim <at> flashner.co.il>
To: Maxime Devos <maximedevos <at> telenet.be>
Cc: 54635 <at> debbugs.gnu.org, Arun Isaac <arunisaac <at> systemreboot.net>
Subject: Re: [PATCH v2 5/5] gnu: Add wfmash.
Date: Thu, 31 Mar 2022 16:09:07 +0300

[Message part 1 (text/plain, inline)]

On Thu, Mar 31, 2022 at 03:07:49PM +0200, Maxime Devos wrote:
> Efraim Flashner schreef op do 31-03-2022 om 15:18 [+0300]:
> > > Arun Isaac schreef op do 31-03-2022 om 12:58 [+0530]:
> > > > +                       (("-march=native") ""))
> > > 
> > > This is also wrong for x86 systems because it makes the build non-
> > > reproducible.  Also, has upstream been informed about some of the
> > > compiler flags being architecture-specific?
> > 
> > I'm pretty sure upstream is aware of it, and the -mcx16 flag. That
> > whole phase doesn't need to be non-x86_64 only, upstream prefers it
> > that way to get fater results
> 
> wfmash could be written to detect CPU features at runtime and there is
> also --tune.  Also, upstream preferring march=native does not make the
> build reproducible.
> 
> > but IMO it would be fine to move it into a snippet.
> 
> It does not have to be in a snippet, it just needs to be reproducible
> (so no march=native, whether on x86 or not).
> 
> Upstream seems to be aware of the non-x86
> (https://github.com/ekg/wfmash/issues/125) but they do not seem to be
> aware of the problems with march=native.

I will let them know. I also added a patch which runs a test suite based
on the github action.


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Efraim Flashner   <efraim <at> flashner.co.il>   אפרים פלשנר
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