TARGET_ROOT_PRE_PODF
for (u_int prediv = 1; prediv <= __SHIFTOUT_MASK(TARGET_ROOT_PRE_PODF) + 1; prediv++) {
val &= ~TARGET_ROOT_PRE_PODF;
val |= __SHIFTIN(best_prediv - 1, TARGET_ROOT_PRE_PODF);
const u_int pre_div = __SHIFTOUT(val, TARGET_ROOT_PRE_PODF) + 1;