[Bug tree-optimization/102087] [12 Regression] ICE on valid code at -O3 on x86_64-linux-gnu: in determine_exit_conditions, at tree-ssa-loop-manip.c:1049 since r12-3136-g3673dcf6d6baeb67

[guojiufu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102087

--- Comment #7 from Jiu Fu Guo <guojiufu at gcc dot gnu.org> ---
If step is +-1, or if the 'iv base' is constant, the 'bound' would be
calculated as const.  

Otherwise, the 'bound' maybe something like: "(max - base) / step * step +
base". For this case, then runtime cost may need to calculate 'bound'. 
I'm wondering if it is beneficial to support this kind of case.