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To: gentoo-dev@g.o
From: Ryan Hill <dirtyepic@g.o>
Subject: Re: filter-mfpmath: has Gentoo out grown it ?
Date: Fri, 2 Dec 2011 23:36:59 -0600
On Fri, 02 Dec 2011 20:36:16 -0500
Mike Gilbert <floppym@g.o> wrote:

> I've never thought of -mfpmath=sse as a "ricer" flag. If anything, it
> should make floating point calculations more consistent.

Not really.  It's it's extremely target processor dependent and generally the
defaults are the best settings.  It can vary a lot based on the SSE
instructions and number of registers available and the register allocator and
scheduler are optimized with that in mind.

> The varying behavior between gcc versions seems like a possibly good
> reason to not "support" it, but I'm not familiar with this. Has it
> stabilized recently or is it still in flux?

I'd say it's still in flux.  The register allocator and instruction scheduler
were both rewritten for 4.4 and have seen a lot of work since then.


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References:
filter-mfpmath: has Gentoo out grown it ?
-- Mike Frysinger
Re: filter-mfpmath: has Gentoo out grown it ?
-- Mike Gilbert
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