private SlotIndex GetLowOptimalSplitLocation(LiveInterval liveInterval, SlotIndex from, bool check)
{
Debug.Assert(liveInterval.Start != from);
if (trace.Active) trace.Log("--Low Splitting: " + liveInterval.ToString() + " move: " + from.ToString());
if (check)
{
if (liveInterval.UsePositions.Contains(from) || liveInterval.DefPositions.Contains(from))
{
if (trace.Active) trace.Log(" No optimal. Split move: " + from.ToString());
return from;
}
}
SlotIndex blockStart = GetBlockStart(from);
if (trace.Active) trace.Log(" Block Start : " + blockStart.ToString());
SlotIndex lowerBound = blockStart > liveInterval.Start ? blockStart : liveInterval.Start.Next;
if (trace.Active) trace.Log(" Lower Bound : " + lowerBound.ToString());
SlotIndex previousUse = liveInterval.GetPreviousDefOrUsePosition(from);
if (trace.Active) trace.Log(" Previous Use: " + (previousUse != null ? previousUse.ToString() : "null"));
if (previousUse != null && previousUse >= lowerBound)
{
if (trace.Active) trace.Log(" Low Optimal : " + previousUse.Next.ToString());
return previousUse.Next;
}
if (trace.Active) trace.Log(" Low Optimal : " + lowerBound.ToString());
return lowerBound;
}
