------- Comment #7 from dberlin at gcc dot gnu dot org 2006-08-24 14:43 ------- Subject: Re: [tree-ssa] Optimize cascaded a = a == 0;
pinskia at gcc dot gnu dot org wrote: > ------- Comment #6 from pinskia at gcc dot gnu dot org 2006-08-24 04:27 > ------- > Another interesting case would be (but which could be handled by VRP): > int > foo (int a) > { > a = a!=0; > a = a!=0; > a = a!=0; > a = a!=0; > a = a!=0; > return a; > } > Which should be optimized to: > int foo(int a) { return a!=0;} > > Uh, FRE could also optimize this to the same thing, I just don't remember whether it bothers to look at conditionals as eliminable expressions. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15452