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[Bug middle-end/52996] [4.8 Regression] ice in verify_loop_structure, at cfgloop.c:1567
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 16 Apr 2012 10:58:06 +0000
- Subject: [Bug middle-end/52996] [4.8 Regression] ice in verify_loop_structure, at cfgloop.c:1567
- Auto-submitted: auto-generated
- References: <bug-52996-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52996
--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-04-16 10:58:06 UTC ---
Looks like a pre-existing bug to me - when we unswitch loops computing
irreducible regions before / after that can lead to inconsistent results.
Loop preserving leads to different loop structure at the beginning of
RTL unswitching compared to the 4.7 branch.