private InstructionDependency[] Convert(InstructionDependency[] preds, TypeDescriptor from, TypeDescriptor to)
{
if (from.Equals(to))
{
// nothing to do
return(preds);
}
else if (IsSFix(from) && IsUFix(to))
{
var fromFmt = SFix.GetFormat(from);
var toFmt = UFix.GetFormat(to);
int interIW = toFmt.IntWidth + 1;
int interFW = toFmt.FracWidth;
if (interIW != fromFmt.IntWidth ||
interFW != fromFmt.FracWidth)
{
var interType = SFix.MakeType(interIW, interFW);
Emit(DefaultInstructionSet.Instance.Convert().CreateStk(preds, 1, from, interType));
Emit(DefaultInstructionSet.Instance.Convert().CreateStk(1, interType, to));
}
else
{
Emit(DefaultInstructionSet.Instance.Convert().CreateStk(preds, 1, from, to));
}
return(new InstructionDependency[0]);
}
else if (IsUFix(from) && IsSFix(to))
{
var fromFmt = UFix.GetFormat(from);
var toFmt = SFix.GetFormat(to);
int interIW = toFmt.IntWidth - 1;
int interFW = toFmt.FracWidth;
if (interIW != fromFmt.IntWidth ||
interFW != fromFmt.FracWidth)
{
var interType = UFix.MakeType(interIW, interFW);
Emit(DefaultInstructionSet.Instance.Convert().CreateStk(preds, 1, from, interType));
Emit(DefaultInstructionSet.Instance.Convert().CreateStk(1, interType, to));
}
else
{
Emit(DefaultInstructionSet.Instance.Convert().CreateStk(preds, 1, from, to));
}
return(new InstructionDependency[0]);
}
else if (IsSLV(from))
{
int wfrom = TypeLowering.Instance.GetWireWidth(from);
int wto = TypeLowering.Instance.GetWireWidth(to);
if (wfrom == wto)
{
Emit(DefaultInstructionSet.Instance.Convert().CreateStk(preds, 1, from, to));
}
else
{
var interType = StdLogicVector.MakeType(wto);
Emit(DefaultInstructionSet.Instance.Convert().CreateStk(preds, 1, from, interType));
Convert(interType, to);
}
return(new InstructionDependency[0]);
}
else if (IsSLV(to))
{
int wfrom = TypeLowering.Instance.GetWireWidth(from);
int wto = TypeLowering.Instance.GetWireWidth(to);
if (wfrom == wto)
{
Emit(DefaultInstructionSet.Instance.Convert().CreateStk(preds, 1, from, to));
}
else
{
var interType = StdLogicVector.MakeType(wfrom);
Emit(DefaultInstructionSet.Instance.Convert().CreateStk(preds, 1, from, interType));
Convert(interType, to);
}
return(new InstructionDependency[0]);
}
else
{
Emit(DefaultInstructionSet.Instance.Convert().CreateStk(preds, 1, from, to));
return(new InstructionDependency[0]);
}
}
