[Bug rtl-optimization/68194] [6 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68194

--- Comment #6 from ktkachov at gcc dot gnu.org ---
Proposed patch at:
https://gcc.gnu.org/ml/gcc-patches/2015-11/msg01953.html