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To: gentoo-dev@g.o
From: Ryan Hill <dirtyepic.sk@...>
Subject: Re: [RFC] CFLAGS paragraph for the GWN
Date: Sun, 01 Oct 2006 12:00:10 -0600
Duncan wrote:

> Could you point me at some info on this one (-ftree-vectorize)?  It came
> up on the amd64 list a week or so ago, when someone asked what I thought
> of it and why I didn't have it in my cflags (which I had just explained). 
> I said I didn't know enough about it to make a case either way, and as
> such, didn't choose to use it.  However, after a bit of discussion, I
> decided to add it to my cflags on a very experimental basis.  I haven't
> experienced any issues with it, but then I haven't done any major
> compiling since then either, only the routine updates.

http://tinyurl.com/l75we

They've fixed quite a few of the ICE's since last I looked, though
there's more than a couple that went in after 4.1.1.  4.2 is a little
better, but I'm having enough trouble getting it to build things
properly _without_ using any fancy flags right now. ;p

See http://tinyurl.com/rt3aa for some real-world examples.

> Or does the problem not necessarily apply to amd64?  Even knowing that
> would be useful.  I simply don't know anything much at all about it, beyond
> a generally vague idea that it means using mmx/sse/whatever vector
> instructions to parallelize loops.

I'd say that there's more ICE's on i686-pc-linux-gnu than
x86_64-*-linux-gnu, but there's still enough.  Luckily Halcy0n was
really good for reducing testcases and pushing them upstream, so a lot
of these issues got fixed at the source.

--de.

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Replies:
Re: [RFC] CFLAGS paragraph for the GWN
-- Duncan
References:
[RFC] CFLAGS paragraph for the GWN
-- Lionel Bouton
Re: [RFC] CFLAGS paragraph for the GWN
-- Ryan Hill
Re: Re: [RFC] CFLAGS paragraph for the GWN
-- Robin H. Johnson
Re: [RFC] CFLAGS paragraph for the GWN
-- Ryan Hill
Re: [RFC] CFLAGS paragraph for the GWN
-- Duncan
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Updated Jan 15, 2010

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