public BasicBlock SplitEdge(BasicBlock predecessor, BasicBlock successor)
{
BasicBlock splitBlock = new BasicBlock(Blocks.Count);
if (predecessor.Next == successor)
{
predecessor.Next = splitBlock;
}
if (predecessor.Branch == successor)
{
predecessor.Branch = splitBlock;
}
if (splitBlock.Predecessors.Count == 0)
{
throw new ArgumentException("Predecessor and successor are not connected.");
}
// Insert the new block on the list of blocks.
BasicBlock succPrev = successor.Node.Previous?.Value;
if (succPrev != null && succPrev != predecessor && succPrev.Next == successor)
{
// Can't insert after the predecessor or before the successor.
// Here, we insert it before the successor by also spliting another
// edge (the one between the block before "successor" and "successor").
BasicBlock splitBlock2 = new BasicBlock(splitBlock.Index + 1);
succPrev.Next = splitBlock2;
splitBlock2.Branch = successor;
splitBlock2.Operations.AddLast(new Operation(Instruction.Branch, null));
Blocks.AddBefore(successor.Node, splitBlock2);
}
splitBlock.Next = successor;
Blocks.AddBefore(successor.Node, splitBlock);
return(splitBlock);
}
public BasicBlock SplitEdge(BasicBlock predecessor, BasicBlock successor)
{
BasicBlock splitBlock = new BasicBlock(Blocks.Count);
for (int i = 0; i < predecessor.SuccessorCount; i++)
{
if (predecessor.GetSuccessor(i) == successor)
{
predecessor.SetSuccessor(i, splitBlock);
}
}
if (splitBlock.Predecessors.Count == 0)
{
throw new ArgumentException("Predecessor and successor are not connected.");
}
splitBlock.AddSuccessor(successor);
Blocks.AddBefore(successor, splitBlock);
return splitBlock;
}