[Bug rtl-optimization/64756] wrong code at -O3 on x86_64-linux-gnu (in 32-bit mode)

[mikpelinux at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64756

--- Comment #2 from Mikael Pettersson <mikpelinux at gmail dot com> ---
Also fails on m68k, but not on powerpc64, sparc64, or ARMv5.