[Bug tree-optimization/87543] Inconsistency in noticing a constant result rather than emitting code for a loop

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87543

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
As I mentioned in PR 87987:
So I think LLVM's unrolling notices the load will become constant and the whole
induction variable basically goes away for sum.


I also said something similar in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97077#c3 too.