/*  sdmprpup.cpp  by K.Tsuru  */
// function ID 357  DRADIX, BRADIX
/******************************************************************
SDouble and SDecimal classes
It examines whether it is proper to increase the precision by "upPrec"
figures or not.It is provided for the reason that when the size exceeds
the power of two by several figures,both the memory allocation and the FFT
multiplication become inefficient.
Although the value (effective figures)/4=509 is "PROPER", due to the use
of "ProperUpPrec" in Exp(x) the evaluation time becomes later by about
thirty persent, i.e. 3.5(sec)-->4.8(sec).
*******************************************************************/
#ifndef SN_H
#include "sn.h"
#endif
uint SDouble::ProperUpPrec(uint upPrec) const {
    if(PreferSpeed() == OFF) return upPrec;
    uint ms = MaxSize(), sz = ceilpow2(ms);
//When upPrec = 0 return 0.
    if(ms + upPrec <= sz) return min(sz - ms, upPrec);
    return 0;
}