[LLVMdev] MachineLoopInfo Analysis Not Done

[Chris Lattner]

On Dec 6, 2007, at 5:56 PM, Bill Wendling wrote:

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

Maybe this is because it has runOnFunction disabled?:

class MachineLoopInfo : public MachineFunctionPass {
...
   bool runOnFunction(Function& F) { return false; }

-Chris