[Bug middle-end/64491] [5 Regression] incorrect warning: loop exit may only be reached after undefined behavior

[ams at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64491

--- Comment #10 from Andrew Stubbs <ams at gcc dot gnu.org> ---
I'm trying to look at this problem, but so far all my builds are failing.
Probably I have some local cruft.

In the meantime, the workaround is to use -Wno-aggressive-loop-optimizations, I
think.