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Date: Sun, 11 May 2014 17:20:30 -0400
From: Rich Felker <>
To: James Cloos <>
Cc: Thomas Petazzoni <>,
Subject: Re: Broken GCC versions: 4.8.2 and 4.9.0

On Sun, May 11, 2014 at 04:08:37PM -0400, James Cloos wrote:
> >>>>> "RF" == Rich Felker <> writes:
> RF> I've tested it on and others have tested with local
> RF> gcc 4.8.2 and 4.9.0, probably distro-provided (I didn't ask).
> I just tried debian-sid's 4.9.  That does show the bug.  As does their
> gcc-snapshot version (a 4.10 pre).
> Perhaps the distro(s) which have the bug with 4.8.2 backported the commit
> where the bug first occurs?

Sounds plausible. Maybe that will help find the offending commit.

> RF> I wonder if the broken GCC is using isl/cloog
> I use the graphite optimizer on my Gentoo box (which generated the
> assembly I quoted).  The graphite code is only used when one or more
> of -floop-interchange -floop-strip-mine -floop-block are specified.
> Testing with those options doesn't change the results.

OK, ruled that out then.


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