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[Bug tree-optimization/54824] [4.8 Regression] ICE in verify_loop_structure
- 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: Wed, 24 Oct 2012 12:56:35 +0000
- Subject: [Bug tree-optimization/54824] [4.8 Regression] ICE in verify_loop_structure
- Auto-submitted: auto-generated
- References: <bug-54824-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54824
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |matz at gcc dot gnu.org
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> 2012-10-24 12:56:35 UTC ---
It is RTL expansion that ends up connecting BB9, a common exit block of
the two unswitched loops randomly to BB10, the loop latch, forming a new loop.
And it is find_many_sub_basic_blocks that does this. Eh ... bad luck.