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[Bug tree-optimization/17560] [4.0 Regression] Infinite recursion in tree-scalar-evolution with -Os
- From: "dnovillo at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 8 Oct 2004 12:39:38 -0000
- Subject: [Bug tree-optimization/17560] [4.0 Regression] Infinite recursion in tree-scalar-evolution with -Os
- References: <20040919165202.17560.kherron+gcc@fmailbox.com>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From dnovillo at redhat dot com 2004-10-08 12:39 -------
Subject: Re: [4.0 Regression] Infinite
recursion in tree-scalar-evolution with -Os
On Fri, 2004-10-08 at 08:07, sebastian dot pop at cri dot ensmp dot fr
wrote:
> The problem is that we have a cycle "i_1 -> i_2 -> i_1" outside any
> loop, and I'm not sure about the semantics of this representation.
> By the way, is this a valid SSA form?
>
It is, but this graph is irreducible. Block #3 is only reachable via a
back edge. Or put it another way, block #4 is the entry block for two
different loops.
Diego.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17560