[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 #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
Ah good, a testcase, thanks. Maybe we'll understand what was breaking spec now.
Transformation happens during PRE.