https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83253
--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Well, in theory multiplication by 3 isn't that expensive on i?86/x86_64, because lea can do that. But multiplication by 4 should be still cheaper or as cheap as, because if we do * 3 by lea, we can do * 4 by lea too (or can use shift), and if we do * 3 by mov + add + add, that is more expensive than shift or as add + add.
