private static IntX Trim(IntX value, int size)
{
IntX rem = new IntX(1) << size;
switch (DesignContext.Instance.FixPoint.OverflowMode)
{
case EOverflowMode.Wrap:
value = IntX.Modulo(value, rem, DivideMode.AutoNewton);
if (value < 0)
{
value += rem;
}
break;
case EOverflowMode.Saturate:
if (value > rem)
{
value = rem;
}
else if (value < 0)
{
value = 0;
}
break;
case EOverflowMode.Fail:
if (value > rem || value < 0)
{
throw new ArgumentException();
}
break;
}
return(value);
}
private static IntX Trim(IntX value, int size)
{
if (value == null)
{
return(null);
}
if (size == 0)
{
if (value != 0 &&
DesignContext.Instance.FixPoint.OverflowMode == EOverflowMode.Fail)
{
throw new ArgumentException();
}
return(0);
}
IntX rem = new IntX(1) << (int)size;
IntX rem2 = rem >> 1;
switch (DesignContext.Instance.FixPoint.OverflowMode)
{
case EOverflowMode.Wrap:
value = IntX.Modulo(value, rem, DivideMode.AutoNewton);
if (value >= rem2)
{
value -= rem;
}
else if (value < -rem2)
{
value += rem;
}
return(value);
case EOverflowMode.Fail:
if (value > rem2 - 1 || value < -rem2)
{
throw new ArgumentException();
}
return(value);
case EOverflowMode.Saturate:
if (value > rem2 - 1)
{
return(rem2 - 1);
}
else if (value < -rem2)
{
return(-rem2);
}
else
{
return(value);
}
default:
throw new NotImplementedException();
}
}
public Unsigned Resize(int newWidth)
{
if (newWidth < Size)
{
IntX one = new IntX(1);
IntX rem = (one << newWidth);
IntX newValue = IntX.Modulo(_value, rem, DivideMode.AutoNewton);
return(new Unsigned(newValue, newWidth));
}
else
{
return(new Unsigned(_value, newWidth));
}
}