downx
fstrt = downx(fconst, par->diwstrt_h - 4) - fsize;
fstrt = downx(fconst, par->diwstrt_h - fconst + (1 << clk_shift) - 4) -
fstrt = downx(fconst, par->diwstrt_h - 4) - 64 - fconst;
modx(fconst, downx(1 << clk_shift, par->diwstrt_h - 4)));
move = downx(2 << maxfmode, div8(par->xoffset));
fstrt = downx(fconst, fstrt) - 64;
mod = fstrt = downx(fconst, fstrt) - fconst;