public Instruction CreateLongInstruction(AddSubCandidate loCandidate, AddSubCandidate hiCandidate)
{
var totalSize = PrimitiveType.Create(
Domain.SignedInt | Domain.UnsignedInt,
loCandidate.Dst.DataType.BitSize + loCandidate.Dst.DataType.BitSize);
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);
if (dst is Identifier idDst)
{
return(new Assignment(idDst, expSum));
}
else
{
return(new Store(dst, expSum));
}
}
/// <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);
}
if (!(stms[i].Instruction is Assignment ass))
{
continue;
}
if (IsCarryFlag(ass.Dst))
{
return(null);
}
}
return(null);
}
/// <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(Identifier cy, AddSubCandidate loInstr)
{
var queue = new Queue <Statement>(ssa.Identifiers[cy].Uses);
while (queue.Count > 0)
{
var use = queue.Dequeue();
var asc = MatchAdcSbc(use);
if (asc != null)
{
//Debug.Print("Left sides: [{0}] [{1}]", asc.Left, loInstr.Left);
if (asc.Left.GetType() != loInstr.Left.GetType())
{
return(null);
}
asc.Statement = use;
return(asc);
}
if (!(use.Instruction is Assignment ass))
{
continue;
}
if (ass.Src is Slice)
{
queue.EnqueueRange(ssa.Identifiers[ass.Dst].Uses);
continue;
}
if (IsCarryFlag(ass.Dst))
{
return(null);
}
}
return(null);
}
/// <summary>
/// Find a statement index appropriate for insert the new
/// long addition statements.
/// </summary>
/// <returns></returns>
private int FindInsertPosition(AddSubCandidate loCandidate, AddSubCandidate hiCandidate, StatementList stmts)
{
int iStm = stmts.IndexOf(hiCandidate.Statement!);
if (loCandidate.Dst is Identifier idLow)
{
int iFirstLowUsage = ssa.Identifiers[idLow].Uses
.Select(u => stmts.IndexOf(u))
.Where(i => i >= 0)
.Min();
iStm = Math.Min(iStm, iFirstLowUsage);
}
return iStm;
}
/// <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);
}
}
public void CreateLongInstruction(AddSubCandidate loCandidate, AddSubCandidate hiCandidate)
{
var totalSize = PrimitiveType.Create(
Domain.SignedInt | Domain.UnsignedInt,
loCandidate.Dst !.DataType.BitSize + hiCandidate.Dst !.DataType.BitSize);
var left = CreateCandidate(loCandidate.Left, hiCandidate.Left, totalSize);
var right = CreateCandidate(loCandidate.Right, hiCandidate.Right, totalSize);
this.dst = CreateCandidate(loCandidate.Dst, hiCandidate.Dst, totalSize);
var stmts = hiCandidate.Statement !.Block.Statements;
var linAddr = hiCandidate.Statement.LinearAddress;
var iStm = FindInsertPosition(loCandidate, hiCandidate, stmts);
Statement?stmMkLeft = null;
if (left is Identifier)
{
stmMkLeft = stmts.Insert(
iStm++,
linAddr,
CreateMkSeq(left, hiCandidate.Left, loCandidate.Left));
left = ReplaceDstWithSsaIdentifier(left, null !, stmMkLeft);
}
Statement?stmMkRight = null;
if (right is Identifier)
{
stmMkRight = stmts.Insert(
iStm++,
linAddr,
CreateMkSeq(right, hiCandidate.Right, loCandidate.Right));
right = ReplaceDstWithSsaIdentifier(right, null !, stmMkRight);
}
var expSum = new BinaryExpression(loCandidate.Op, left.DataType, left, right);
Instruction instr = Assign(dst, expSum);
var stmLong = stmts.Insert(iStm++, linAddr, instr);
this.dst = ReplaceDstWithSsaIdentifier(this.dst, expSum, stmLong);
var sidDst = GetSsaIdentifierOf(dst);
var sidLeft = GetSsaIdentifierOf(left);
var sidRight = GetSsaIdentifierOf(right);
if (stmMkLeft != null && sidLeft != null)
{
GetSsaIdentifierOf(loCandidate.Left)?.Uses.Add(stmMkLeft);
GetSsaIdentifierOf(hiCandidate.Left)?.Uses.Add(stmMkLeft);
}
if (stmMkRight != null && sidRight != null)
{
GetSsaIdentifierOf(loCandidate.Right)?.Uses.Add(stmMkRight);
GetSsaIdentifierOf(hiCandidate.Right)?.Uses.Add(stmMkRight);
}
if (sidDst != null)
{
if (sidLeft != null)
{
sidLeft.Uses.Add(stmLong);
}
if (sidRight != null)
{
sidRight.Uses.Add(stmLong);
}
}
var sidDstLo = GetSsaIdentifierOf(loCandidate.Dst);
if (sidDstLo != null)
{
var cast = new Slice(loCandidate.Dst.DataType, dst, 0);
var stmCastLo = stmts.Insert(iStm++, linAddr, new AliasAssignment(
sidDstLo.Identifier, cast));
var stmDeadLo = sidDstLo.DefStatement;
sidDstLo.DefExpression = cast;
sidDstLo.DefStatement = stmCastLo;
var sidDstHi = GetSsaIdentifierOf(hiCandidate.Dst);
var slice = new Slice(hiCandidate.Dst.DataType, dst, loCandidate.Dst.DataType.BitSize);
var stmSliceHi = stmts.Insert(iStm++, linAddr, new AliasAssignment(
sidDstHi !.Identifier, slice));
var stmDeadHi = sidDstHi.DefStatement;
sidDstHi.DefExpression = slice;
sidDstHi.DefStatement = stmSliceHi;
if (sidDstLo != null)
{
sidDst !.Uses.Add(stmCastLo);
}
if (sidDstHi != null)
{
sidDst !.Uses.Add(stmSliceHi);
}
ssa.DeleteStatement(stmDeadLo !);
ssa.DeleteStatement(stmDeadHi !);
}
}