------- Additional Comments From sebastian dot pop at cri dot ensmp dot fr 2005-01-25 11:02 ------- Subject: Re: [4.0 Regression] IV-OPTS is O(N^3)
rakdver at atrey dot karlin dot mff dot cuni dot cz wrote: > > (*) I hope; scev is a mess of mutualy recursive functions -- > analyze_scalar_evolution calling number_of_iterations calling > instantiate_parameters calling analyze_scalar_evolution again, with > instantiate_parameters hacked so that the infinite cycle cannot occur is > my favourite one. Nobody can say anything sure about behavior of scev > -- it is not even well defined what analyze_scalar_evolutions will > return to you, It returns to you an evolution that might contain SSA_NAMEs. > unless you call instantiate_parameters or resolve_mixers > on the result. > And once you call instantiate_parameters on the result you're guaranteed that what you get does contain only determined constants, or otherwise the result is chrec_dont_know. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18595
