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[Bug tree-optimization/81354] [5/6 Regression] Segmentation fault in SSA Strength Reduction using -O3
- From: "wschmidt at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 19 Jul 2017 19:57:48 +0000
- Subject: [Bug tree-optimization/81354] [5/6 Regression] Segmentation fault in SSA Strength Reduction using -O3
- Auto-submitted: auto-generated
- References: <bug-81354-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81354
--- Comment #6 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Hm, the symptom looks very much like another issue I've been looking at on
trunk. There may be an issue with the statement->candidate mapping hash table
that's responsible for both. It appears to be a somewhat rare issue involving
chains of phis where one of the "more recent" phis is receiving the same value
from at least two different incoming edges, but I don't yet have a complete
answer.