https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65504
--- Comment #11 from howarth at bromo dot med.uc.edu --- Created attachment 35087 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35087&action=edit diff of assembly from reduced testcase at -O2 -mtune=core2 and -O2 -mtune=generic