[gentoo-amd64] FW: GCC4 and -ftree-vectorize

["Duncan" <1i5t5.duncan@cox.net>]

-ftree-vectorize just came up on the gentoo-dev list.  I've not even
checked the URLs yet, but since it came up here, I thought I'd ask about
it and having gotten a response, here's the gist.  (FWIW, I've been
running it experimentally for a bit now.  No issues with it have I seen,
but I've not done a full emerge --emptytree system/world yet.)  I'll
probably have a bit more to say about it after checking the tinyurls,
which at this point I don't even know where they go yet, let alone their
content.

<quote from Ryan Hill>

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[]

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?

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.

<end of quote from Ryan>

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

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