/// <summary>
/// Determines if the carry flag reaches a using instruction.
/// </summary>
/// <param name="instrs"></param>
/// <param name="i"></param>
/// <param name="next"></param>
/// <returns></returns>
public AddSubCandidate FindUsingInstruction(StatementList stms, int i, AddSubCandidate loInstr)
{
for (++i; i < stms.Count; ++i)
{
var asc = MatchAdcSbc(stms[i].Instruction);
if (asc != null)
{
Debug.Print("Left sides: [{0}] [{1}]", asc.Left, loInstr.Left);
if (asc.Left.GetType() != loInstr.Left.GetType())
return null;
asc.StatementIndex = i;
return asc;
}
var ass = stms[i].Instruction as Assignment;
if (ass == null)
continue;
var bin = ass.Src as BinaryExpression;
if (bin == null)
continue;
if (IsCarryFlag(ass.Dst))
return null;
}
return null;
}
public Instruction CreateLongInstruction(AddSubCandidate loCandidate, AddSubCandidate hiCandidate)
{
var totalSize = PrimitiveType.Create(
Domain.SignedInt | Domain.UnsignedInt,
loCandidate.Dst.DataType.Size + loCandidate.Dst.DataType.Size);
var left = CreateCandidate(loCandidate.Left, hiCandidate.Left, totalSize);
var right = CreateCandidate(loCandidate.Right, hiCandidate.Right, totalSize);
this.dst = CreateCandidate(loCandidate.Dst, hiCandidate.Dst, totalSize);
if (left == null || right == null || dst == null)
return null;
var expSum = new BinaryExpression(loCandidate.Op, left.DataType, left, right);
var idDst = dst as Identifier;
if (idDst != null)
{
return new Assignment(idDst, expSum);
}
else
{
return new Store(dst, expSum);
}
}