llvm dev - Dec 2007 - [LLVMdev] MachineLoopInfo Analysis Not Done

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

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

Fixed now!

--Owen

On Dec 6, 2007, at 9:30 PM, Chris Lattner wrote:
>
> 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
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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