[Bug tree-optimization/71550] [7 Regression] wrong code at -O3 on x86_64-linux-gnu

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71550

--- Comment #4 from Jeffrey A. Law <law at redhat dot com> ---
This has gone latent on the trunk, but I'm pretty sure the core issues remain.

Looking deeper into the problem, this may be another case of jump threading
invalidating the cached loop iteration information.