On Wed, Oct 09, 2013 at 09:02:31PM +0200, Peter Zijlstra wrote:
> On Wed, Oct 09, 2013 at 08:16:13PM +0200, Jakub Jelinek wrote:
> > Confirmed as gcc bug, filed http://gcc.gnu.org/PR58670
> > Seems all of 4.[6-9] miscompile it. Will have a look tomorrow
> > unless somebody beats me to it. But historically, the case where
> > asm goto labels jump to fallthru basic block had numerous problems in the
> > past.
>
> That bug lists the component as middle end; this suggests x86_64 would
> be vulnerable too, can you confirm? So far we've only observed the wrong
> code on i386 targets, x86_64 targets appeared correct.
Any target, the testcase in the bugzilla aborts on x86_64 with -O2, and
even say on ppc64 (sure, one would have to rewrite the asm to have it fail
at runtime).
Jakub
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
