[Bug tree-optimization/56355] abs and multiplication

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56355

--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> 2013-03-20 15:40:30 UTC ---
Jeff Law mentions that it would be good to add this "squares are nonnegative"
information to VRP, not just tree_binary_nonnegative_warnv_p.
http://gcc.gnu.org/ml/gcc-patches/2013-03/msg00690.html