good afternoon.
this query should find situations where the return value from some function might become part of the denominator and result in a division by zero.
this error is widely represented in projects.

detecting: CVE-2018-18190.
it is worth noting that the detection would be much wider, for example, it would cover colors such as CVE-2021-34069 if GlobalValueNumbering could work with FieldAccess.

I also ask for help in optimizing this query, after trying to make it look laconic, I got extremely poor performance, while quite trivial changes, such as moving msg to a common place or removing divFn, lead to an even greater slowdown.
It is difficult for me to move without having an understanding of the work of the optimizer, so I ask for any advice. if you don’t have them, I’ll have to move back, moving away from the laconic look.

Thanks.