private static FixFormat Equalize(SFix a, SFix b, out Signed an, out Signed bn)
{
an = a._value;
bn = b._value;
FixFormat dfmt;
switch (DesignContext.Instance.FixPoint.ArithSizingMode)
{
case EArithSizingMode.Safe:
dfmt = new FixFormat(true,
Math.Max(a.Format.IntWidth, b.Format.IntWidth) + 1,
Math.Max(a.Format.FracWidth, b.Format.FracWidth));
an = an.Resize(dfmt.TotalWidth - 1);
bn = bn.Resize(dfmt.TotalWidth - 1);
if (a.Format.FracWidth > b.Format.FracWidth)
{
bn = bn << (int)(a.Format.FracWidth - b.Format.FracWidth);
}
else if (b.Format.FracWidth > a.Format.FracWidth)
{
an = an << (int)(b.Format.FracWidth - a.Format.FracWidth);
}
return(dfmt);
case EArithSizingMode.VHDLCompliant:
dfmt = new FixFormat(true,
Math.Max(a.Format.IntWidth, b.Format.IntWidth) + 1,
Math.Max(a.Format.FracWidth, b.Format.FracWidth));
an = an.Resize(dfmt.TotalWidth);
bn = bn.Resize(dfmt.TotalWidth);
if (a.Format.FracWidth > b.Format.FracWidth)
{
bn = bn << (int)(a.Format.FracWidth - b.Format.FracWidth);
}
else if (b.Format.FracWidth > a.Format.FracWidth)
{
an = an << (int)(b.Format.FracWidth - a.Format.FracWidth);
}
return(dfmt);
case EArithSizingMode.InSizeIsOutSize:
dfmt = a.Format;
bn = bn.Resize(dfmt.TotalWidth);
if (a.Format.FracWidth > b.Format.FracWidth)
{
bn = bn << (int)(a.Format.FracWidth - b.Format.FracWidth);
}
else if (b.Format.FracWidth > a.Format.FracWidth)
{
an = an << (int)(b.Format.FracWidth - a.Format.FracWidth);
}
return(dfmt);
default:
throw new NotImplementedException();
}
}
/// <summary>
/// Converts the format to a SysDOM type descriptor.
/// </summary>
public static TypeDescriptor ToType(this FixFormat fmt)
{
if (fmt.IsSigned)
{
return(TypeDescriptor.GetTypeOf(SFix.FromDouble(0.0, fmt.IntWidth, fmt.FracWidth)));
}
else
{
return(TypeDescriptor.GetTypeOf(UFix.FromDouble(0.0, fmt.IntWidth, fmt.FracWidth)));
}
}
/// <summary>
/// Extracts the fixed-point format from a SysDOM type descriptor, given that it actually describes a fixed-point number type.
/// </summary>
public static FixFormat GetFixFormat(this TypeDescriptor td)
{
if (td.CILType.Equals(typeof(Signed)) ||
td.CILType.Equals(typeof(SFix)))
{
return(SFix.GetFormat(td));
}
else if (td.CILType.Equals(typeof(Unsigned)) ||
td.CILType.Equals(typeof(UFix)))
{
return(UFix.GetFormat(td));
}
else
{
return(null);
}
}
/// <summary>
/// Multiplies <paramref name="a"/> and <paramref name="b"/>.
/// The integer and fractional width of the result is determined according to the
/// current arithmetic sizing mode (<seealso cref="FixedPointSettings"/>).
/// </summary>
public static SFix operator *(SFix a, SFix b)
{
var tmp = new SFix(a._value * b._value,
a.Format.IntWidth + b.Format.IntWidth,
a.Format.FracWidth + b.Format.FracWidth);
switch (DesignContext.Instance.FixPoint.ArithSizingMode)
{
case EArithSizingMode.Safe:
case EArithSizingMode.VHDLCompliant:
return(tmp);
case EArithSizingMode.InSizeIsOutSize:
return(tmp.Resize(a.Format.IntWidth, a.Format.FracWidth));
default:
throw new NotImplementedException();
}
}
public override object CreateInstance(ETypeCreationOptions options, object template)
{
if (options.HasFlag(ETypeCreationOptions.MultiplicativeNeutral))
{
if (template == null)
{
return(SFix.One);
}
else
{
var sfix = (SFix)template;
return(SFix.FromDouble(1.0, sfix.Format.IntWidth, sfix.Format.FracWidth));
}
}
else if (options.HasFlag(ETypeCreationOptions.NonZero))
{
if (template == null)
{
return(SFix.One);
}
else
{
var sfix = (SFix)template;
return(SFix.FromSigned(Signed.FromInt(1, sfix.Format.TotalWidth), sfix.Format.FracWidth));
}
}
else
{
if (template == null)
{
return(SFix.Zero);
}
else
{
var sfix = (SFix)template;
return(SFix.FromDouble(0.0, sfix.Format.IntWidth, sfix.Format.FracWidth));
}
}
}
public object Deserialize(StdLogicVector slv, TypeDescriptor targetType)
{
var fmt = SFix.GetFormat(targetType);
return(SFix.FromSigned(slv.SignedValue, fmt.FracWidth));
}
public StdLogicVector Serialize(object value)
{
SFix sfix = (SFix)value;
return(sfix.SignedValue.SLVValue);
}
public override object CorrectArgument(object arg)
{
var org = (SFix)arg;
return(SFix.FromDouble(1.0, org.Format.IntWidth, org.Format.FracWidth));
}