private static void Delete(IntrusiveList <Node> nodes, Node node, Operation operation)
{
operation.Destination = null;
for (int index = 0; index < operation.SourcesCount; index++)
{
operation.SetSource(index, null);
}
nodes.Remove(node);
}
private void RemoveUnreachableBlocks(IntrusiveList <BasicBlock> blocks)
{
var visited = new HashSet <BasicBlock>();
var workQueue = new Queue <BasicBlock>();
visited.Add(Entry);
workQueue.Enqueue(Entry);
while (workQueue.TryDequeue(out BasicBlock block))
{
Debug.Assert(block.Index != -1, "Invalid block index.");
for (int i = 0; i < block.SuccessorsCount; i++)
{
BasicBlock succ = block.GetSuccessor(i);
if (visited.Add(succ))
{
workQueue.Enqueue(succ);
}
}
}
if (visited.Count < blocks.Count)
{
// Remove unreachable blocks and renumber.
int index = 0;
for (BasicBlock block = blocks.First; block != null;)
{
BasicBlock nextBlock = block.ListNext;
if (!visited.Contains(block))
{
while (block.SuccessorsCount > 0)
{
block.RemoveSuccessor(index: block.SuccessorsCount - 1);
}
blocks.Remove(block);
}
else
{
block.Index = index++;
}
block = nextBlock;
}
}
}
private void RemoveUnreachableBlocks(IntrusiveList <BasicBlock> blocks)
{
HashSet <BasicBlock> visited = new HashSet <BasicBlock>();
Queue <BasicBlock> workQueue = new Queue <BasicBlock>();
visited.Add(Entry);
workQueue.Enqueue(Entry);
while (workQueue.TryDequeue(out BasicBlock block))
{
Debug.Assert(block.Index != -1, "Invalid block index.");
if (block.Next != null && visited.Add(block.Next))
{
workQueue.Enqueue(block.Next);
}
if (block.Branch != null && visited.Add(block.Branch))
{
workQueue.Enqueue(block.Branch);
}
}
if (visited.Count < blocks.Count)
{
// Remove unreachable blocks and renumber.
int index = 0;
for (BasicBlock block = blocks.First; block != null;)
{
BasicBlock nextBlock = block.ListNext;
if (!visited.Contains(block))
{
block.Next = null;
block.Branch = null;
blocks.Remove(block);
}
else
{
block.Index = index++;
}
block = nextBlock;
}
}
}