[Bug tree-optimization/100349] [11/12 Regression] ICE Segmentation fault during GIMPLE pass: evrp (under -O2 to -Os)

[aldyh at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100349

--- Comment #2 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
evolution_part_in_loop_num() is returning NULL when evrp asks about the PHI
result here:

(gdb) p debug(stmt)
c.1_4 = PHI <c.1_1(4)>

Is this expected?

If it is, we could easily return false if step is null and everything should
just work.