[Bug tree-optimization/58830] wrong code at -O3 on x86_64-linux-gnu (affecting 4.8.x, but not trunk or 4.7.x)

[mikpelinux at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58830

--- Comment #2 from Mikael Pettersson <mikpelinux at gmail dot com> ---
Started with r193882.