[Bug rtl-optimization/67920] wrong code with -O3

[jamrial at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67920

--- Comment #1 from James Almer <jamrial at gmail dot com> ---
For reference you can also check
http://fate.ffmpeg.org/report.cgi?time=20151010052205&slot=x86_64-archlinux-gcc-experimental