Date: Sun, 11 May 2014 17:20:30 -0400 From: Rich Felker <dalias@...c.org> To: James Cloos <cloos@...loos.com> Cc: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>, musl@...ts.openwall.com 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 <dalias@...c.org> writes: > > RF> I've tested it on gcc.godbolt.org 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. Rich
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