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[Bug tree-optimization/71595] [7 Regression] ICE on valid code at -O2 and -O3 on x86_64-linux-gnu: in check_loop_closed_ssa_use, at tree-ssa-loop-manip.c:704
- 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, 23 Nov 2016 15:09:42 +0000
- Subject: [Bug tree-optimization/71595] [7 Regression] ICE on valid code at -O2 and -O3 on x86_64-linux-gnu: in check_loop_closed_ssa_use, at tree-ssa-loop-manip.c:704
- Auto-submitted: auto-generated
- References: <bug-71595-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71595
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
The real reason is probably that after
if (changed)
{
unsigned i;
unloop_loops (loop_closed_ssa_invalidated, &irred_invalidated);
the loop tree is hosed. The following into-loop-closed-SSA rewrite cannot
be possibly successful then.