https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117278
--- Comment #6 from Xionghu Luo (luoxhu at gcc dot gnu.org) <yinyuefengyi at gmail dot com> --- Added X86 maintainers as they are familiar with x86_64 targets, so simple fix should be not do this optimization if build with -Os? But both Power and aarch64 show positive effects with this patch...