[Bug tree-optimization/86927] [8/9 Regression] Gcc miscompiles at -O3 on valid code

[amonakov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86927

Alexander Monakov <amonakov at gcc dot gnu.org> changed:

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                 CC|                            |amonakov at gcc dot gnu.org

--- Comment #2 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Martin, can you try bisecting with -fvect-cost-model=unlimited ?

May be caused by vectorization, reduction created for 'c' looks wrong. gcc-7
did not try to vectorize this.