public bool Optimize(ref List <Instruction> src)
{
int pushidx;
if (CurrentIndex == -1)
{
return(false);
}
Pop OldPop = (Pop)src[CurrentIndex];
pushidx = -1;
Push OldPush = OptimizeUtils.GetLastPush(src, CurrentIndex - 1, ref pushidx);
if (OldPush == null)
{
return(false);
}
// check for same operands
if (OptimizeUtils.SameOperands(OldPop, OldPush))
{
src[CurrentIndex].Emit = false;
src[pushidx].Emit = false;
SamePushPop++;
Optimizer.OptimizationsSize += 6;
Optimizer.Optimizations++;
return(true);
}
if (OldPop.DestinationIsIndirect && OldPush.DestinationIsIndirect)
{
return(false);
}
// Transfer to mov dst,src
if (OptimizeUtils.CanTransfer(OldPush, OldPop))
{
src[CurrentIndex].Emit = false;
src[pushidx].Emit = false;
InstructionWithDestinationAndSourceAndSize mv = new Mov();
OptimizeUtils.CopyDestination((InstructionWithDestinationAndSize)OldPush, ref mv, true);
OptimizeUtils.CopyDestination((InstructionWithDestinationAndSize)OldPop, ref mv, false);
src[CurrentIndex] = mv;
src[pushidx] = null;
PushPopCount++;
Optimizer.OptimizationsSize += 3;
Optimizer.Optimizations++;
}
return(true);
}
public bool Optimize(ref List <Instruction> src)
{
if (CurrentIndex == -1)
{
return(false);
}
LeftPopIdx = CurrentIndex;
LeftPop = src[CurrentIndex] as Pop;
if (LeftPop != null)
{
RightPop = OptimizeUtils.GetLastPop(src, CurrentIndex - 1, ref RightPopIdx);
if (RightPop != null)
{
Right = OptimizeUtils.GetLastPush(src, RightPopIdx - 1, ref RightIdx);
if (Right != null)
{
Left = OptimizeUtils.GetLastPush(src, RightIdx - 1, ref LeftIdx);
if (Left != null)
{
if ((RightPop.DestinationIsIndirect && Right.DestinationIsIndirect) || (LeftPop.DestinationIsIndirect && Left.DestinationIsIndirect))
{
return(false);
}
if (OptimizeUtils.CrossUsage(Left, RightPop) || OptimizeUtils.CrossUsage(Right, LeftPop))
{
return(false);
}
if (OptimizeUtils.IsSegment(Left) || OptimizeUtils.IsSegment(LeftPop) || OptimizeUtils.IsSegment(Right) || OptimizeUtils.IsSegment(RightPop))
{
return(false);
}
// optimize
src[LeftIdx].Emit = false;
src[RightIdx].Emit = false;
InstructionWithDestinationAndSourceAndSize mv = new Mov();
OptimizeUtils.CopyDestination((InstructionWithDestinationAndSize)Right, ref mv, true);
OptimizeUtils.CopyDestination((InstructionWithDestinationAndSize)RightPop, ref mv, false);
src[RightPopIdx] = mv;
mv = new Mov();
OptimizeUtils.CopyDestination((InstructionWithDestinationAndSize)Left, ref mv, true);
OptimizeUtils.CopyDestination((InstructionWithDestinationAndSize)LeftPop, ref mv, false);
src[LeftPopIdx] = mv;
Optimizer.Optimizations += 2;
Optimizations++;
Optimizer.OptimizationsSize += 6;
}
else
{
return(false);
}
}
else
{
return(false);
}
}
else
{
return(false);
}
}
else
{
return(false);
}
return(true);
}
