https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115217
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Note aarch64's TImode is always allocated in starting in even number registers (starting in GCC 9: https://inbox.sourceware.org/gcc-patches/20181002161915.18843-10-richard.hender...@linaro.org/ ) .