[Bug rtl-optimization/57569] [4.8/4.9 Regression] wrong code for struct copy at -O3 on x86_64-linux

[matz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57569

--- Comment #2 from Michael Matz <matz at gcc dot gnu.org> ---
My guess is that it's again somewhere using the wrong predicate
to test directed rw/wr/ww dependencies.