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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/57100] [4.8/4.9 Regression] ICE: in pre_and_rev_post_order_compute, at cfganal.c:869 with -fdump-rtl-pro_and_epilogue-graph
Date: Mon, 29 Apr 2013 08:12:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57100

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-04-29
                 CC|                            |rguenth at gcc dot gnu.org,
                   |                            |stevenb.gcc at gmail dot
                   |                            |com
   Target Milestone|---                         |4.8.1
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> 2013-04-29 08:12:18 UTC ---
Well, you cannot reliably dump graphs at each point in the pass pipeline
in case there are unreachable blocks in the CFG ...

I also routinely hit ICEs in the graph dumping when dumping broken loop
trees (for debugging).

I think we eventually want a custom CFG collecting routine in graph.c
that is not prone to such issues (but just gives up and appends the
rest of the BBs unsorted).