[LLVMdev] MachineLoopInfo Analysis Not Done

[Bill Wendling]

I'm trying to create the Machine LICM pass and I have this defined:

  class VISIBILITY_HIDDEN MachineLICM : public MachineFunctionPass {
    ...
  public:
    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
      AU.setPreservesCFG();
      AU.addRequired<MachineLoopInfo>();
      AU.addRequired<MachineDominatorTree>();
    }
    ...
  };

But when I go to use it:

  bool MachineLICM::runOnMachineFunction(MachineFunction &MF) {
    ...
    // Get our Loop information...
    LI = &getAnalysis<MachineLoopInfo>();
    ...
    for (MachineLoopInfo::iterator
       I = LI->begin(), E = LI->end(); I != E; ++I) {
      ...

it doesn't execute the loop. In fact, the analysis is never ran. How
do I force it to be run?

-bw