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[Bug tree-optimization/71357] [7 Regression] [graphite] ICE: verify_ssa failed (error: definition in block follows the use for SSA_NAME) w/ -O2 -floop-nest-optimize
- From: "marxin at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 10 Jan 2017 09:35:03 +0000
- Subject: [Bug tree-optimization/71357] [7 Regression] [graphite] ICE: verify_ssa failed (error: definition in block follows the use for SSA_NAME) w/ -O2 -floop-nest-optimize
- Auto-submitted: auto-generated
- References: <bug-71357-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71357
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
It disappeared in r237527:
* g++.dg/vect/pr36648.cc: Disable cunrolli
* tree-ssa-loop-ivcanon.c (tree_estimate_loop_size): Fix estimation
of comparsions in the last iteration.
Which is a change in heuristics, thus I guess it's still latent even on trunk.
Probably changing iteration space in the test-case would re-trigger the issue.