/// <summary>
/// Converts <paramref name="src"/> to <paramref name="dstType"/> datatype, possibly with loss of precision or overflow.
/// </summary>
/// <remarks>Currently, conversions between all primitive numeric CIL types, enum types, and System#-intrinsic datatypes
/// Signed, Unsigned, SFix, UFix and StdLogicVector are supported.</remarks>
/// <exception cref="ArgumentNullException">if <paramref name="dstType"/> is null</exception>
/// <exception cref="NotImplementedException">if there is no known conversion to <paramref name="dstType"/></exception>
public static object ConvertUnsigned(Unsigned src, TypeDescriptor dstType)
{
Contract.Requires <ArgumentNullException>(dstType != null, "dstType");
if (dstType.CILType.Equals(typeof(Unsigned)))
{
return(src.Resize(UFix.GetFormat(dstType).IntWidth));
}
else if (dstType.CILType.Equals(typeof(UFix)))
{
return(UFix.FromUnsigned(src.Resize(UFix.GetFormat(dstType).TotalWidth), UFix.GetFormat(dstType).FracWidth));
}
else
{
return(ConvertUnsigned(src, dstType.CILType));
}
}
private Unsigned ComputeConstAddress(Array array, long[] indices, uint nword)
{
MemoryMappedStorage mms = GetDataLayout(array);
ArrayMemoryLayout layout = mms.Layout as ArrayMemoryLayout;
if (layout.ElementsPerWord > 1)
{
throw new NotImplementedException("Multiple elements per word not yet implemented");
}
MemoryRegion region = mms.Region;
IMarshalInfo minfo = region.MarshalInfo;
Unsigned addr = mms.BaseAddress;
for (int i = 0; i < indices.Length; i++)
{
Unsigned offs = Unsigned.FromULong((ulong)indices[i] * layout.Strides[i], mms.Region.AddressWidth);
addr += offs;
}
addr += Unsigned.FromUInt(nword, mms.Region.AddressWidth);
addr = addr.Resize(mms.Region.AddressWidth);
return(addr);
}
private static FixFormat Equalize(UFix a, UFix b, out Unsigned an, out Unsigned bn)
{
an = a._value;
bn = b._value;
FixFormat dfmt;
switch (DesignContext.Instance.FixPoint.ArithSizingMode)
{
case EArithSizingMode.Safe:
dfmt = new FixFormat(false,
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(false,
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 <paramref name="src"/> to <paramref name="dstType"/> datatype, possibly with loss of precision or overflow.
/// </summary>
/// <remarks>Currently, conversions between all primitive numeric CIL types, enum types, and System#-intrinsic datatypes
/// Signed, Unsigned, SFix, UFix and StdLogicVector are supported.</remarks>
/// <exception cref="ArgumentNullException">if <paramref name="dstType"/> is null</exception>
/// <exception cref="NotImplementedException">if there is no known conversion to <paramref name="dstType"/></exception>
public static object ConvertUnsigned(Unsigned src, TypeDescriptor dstType)
{
Contract.Requires<ArgumentNullException>(dstType != null, "dstType");
if (dstType.CILType.Equals(typeof(Unsigned)))
return src.Resize(UFix.GetFormat(dstType).IntWidth);
else if (dstType.CILType.Equals(typeof(UFix)))
return UFix.FromUnsigned(src.Resize(UFix.GetFormat(dstType).TotalWidth), UFix.GetFormat(dstType).FracWidth);
else
return ConvertUnsigned(src, dstType.CILType);
}
