[Bug tree-optimization/110311] [14 Regression] regression in tree-optimizer

[anlauf at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110311

--- Comment #43 from anlauf at gcc dot gnu.org ---
Mabye the fprem issue was a red herring from the beginning, pointing to a
problem in a different place.

I recompiled each module in a loop with -O0 until the FPE went away.

instances_sub.f90 seems the file someone wants to look at.

Works at -O0, -O1, -Os, -O2 -fno-tree-vectorize
Fails at -O2, -O3

on x86_64-pc-linux-gnu.

Jürgen: can you reduce this even more with this information?