[Bug tree-optimization/17560] [4.0 Regression] Infinite recursion in tree-scalar-evolution with -Os

[sebastian dot pop at cri dot ensmp dot fr]

------- Additional Comments From sebastian dot pop at cri dot ensmp dot fr  2004-10-08 13:49 -------
Subject: Re:  [4.0 Regression] Infinite recursion in tree-scalar-evolution with -Os

> Could you check whether the edges are marked as irreducible? If not, this would
> be the problem.
> 

Indeed, both edges for the phi "i_2 = phi (i_4, i_1)" are not marked
by EDGE_IRREDUCIBLE_LOOP, and consequently backedge_phi_arg_p returns
always false.  Same for the first edge i_1 -> i_2 of "i_1 = phi (i_2,
i_7)" that is not marked as EDGE_IRREDUCIBLE_LOOP.



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17560