[Bug tree-optimization/80974] [8 Regression] wrong code (generated code hangs) at -O2 on x86_64-linux-gnu

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80974

--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
scc_vn_restore_ssa_info is called at the end of PRE, but we would need some
form of restoration after any iteration cycle at least (or maybe we shouldn't
have modified the information for h_11, I don't know).