[Bug tree-optimization/65961] [6 Regression] ice in vect_is_simple_use_1 with -O3

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65961

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
It might be mitigated for the testcase in question but the underlying problem
didn't get fixed.