https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100799 --- Comment #16 from Segher Boessenkool <segher at gcc dot gnu.org> --- It cannot be -mcpu=power8, that cannot generate isel. -mcpu=power9 comes closer, but I still do not see exactly the same output, and crucially not the strange store either. What the what.