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Date: Sun, 11 May 2014 16:08:37 -0400
From: James Cloos <>
To: Rich Felker <>
Cc: Thomas Petazzoni <>,
Subject: Re: Broken GCC versions: 4.8.2 and 4.9.0

>>>>> "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?

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.

James Cloos <>         OpenPGP: 0x997A9F17ED7DAEA6

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