[zekica]

Even gcc's -O0 will do the bitshift, but even dividing with 5 on x86_64 will not do idiv:

        imul    rdx, rdx, 1717986919
        shr     rdx, 32
        sar     edx
        sar     eax, 31
        sub     edx, eax
        mov     eax, edx