private static Operand InsertPhi(DefMap[] globalDefs, BasicBlock block, Operand operand)
{
// This block has a Phi that has not been materialized yet, but that
// would define a new version of the variable we're looking for. We need
// to materialize the Phi, add all the block/operand pairs into the Phi, and
// then use the definition from that Phi.
Operand local = Local(operand.Type);
Operation operation = Operation.Factory.PhiOperation(local, block.Predecessors.Count);
AddPhi(block, operation);
globalDefs[block.Index].TryAddOperand(GetId(operand), local);
PhiOperation phi = operation.AsPhi();
for (int index = 0; index < block.Predecessors.Count; index++)
{
BasicBlock predecessor = block.Predecessors[index];
phi.SetBlock(index, predecessor);
phi.SetSource(index, FindDefOnPred(globalDefs, predecessor, operand));
}
return(local);
}
