https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64909
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> --- E.g. unsigned short a[32]; unsigned int b[32]; void foo () { b[0] = a[0]; b[1] = a[1]; b[2] = a[2]; b[3] = a[3]; } will do, or b[0] = a[0] + 5; b[1] = a[1] + 5; b[2] = a[2] + 5; b[3] = a[3] + 5; and similar.