[LLVMdev] Applying different Optimizations for different Functions - Questions?

[Murat]

Hi!

I am trying to develop an LLVM tool which can apply different optimizations
for selected functions. For example, I want to apply an optimization onto one
function but not for another one.

I am using the standard optimizations available in LLVM.

That is the runOnModule function I have written:
bool ComplNewBBFuncs::runOnModule(Module &M)
{
  Function *Main = M.getFunction("main");
  if (Main == 0)
    {
      cerr << "!!! No Main Function" << std::endl;
      return false;
    }

  //Determine each Function
  LoopPass * UnrollLoops;
  FunctionPass *DeadStoreElim;
  LPPassManager *LPPM;

  Function *CurFunc1 = M.getFunction("NewFunction1");
  Function &Current1 = (*CurFunc1);
  Function *CurFunc2 = M.getFunction("NewFunction2");
  Function &Current2 = (*CurFunc2);

  cerr << "Dead Store Eliminations" << std::endl;
  DeadStoreElim = createDeadStoreEliminationPass();
  DeadStoreElim->runOnFunction(Current1);

  cerr << "Loop Unroll" << std::endl;
  LPPM = new LPPassManager(1);
  UnrollLoops = createLoopUnrollPass();
  LPPM->add(UnrollLoops);
  LPPM->runOnFunction(Current2);
  LPPM->releaseMemory();
  delete LPPM;
  LPPM = NULL;

  return true;
}

This tool compiles successfully, but I got errors when I apply it onto
a program.

  DeadStoreElim = createDeadStoreEliminationPass();
  DeadStoreElim->runOnFunction(Current1);
This part of the tool outputs following error message:
  opt: /home/bolat/llvm-2.2/include/llvm/PassAnalysisSupport.h:178:
AnalysisType& llvm::Pass::getAnalysis() const [with AnalysisType =
llvm::MemoryDependenceAnalysis]: Assertion `Resolver &&"Pass has not
been inserted into a PassManager object!"' failed.

I would like to ask how I can include the resolvers?

I also get error when I try to apply the loop optimizations.

  LPPM = new LPPassManager(1);
  UnrollLoops = createLoopUnrollPass();
  LPPM->add(UnrollLoops);
  LPPM->runOnFunction(Current2);
  LPPM->releaseMemory();
  delete LPPM;
  LPPM = NULL;
This part also terminates opt and outputs segmentation fault.
I am not sure if this is the correct way to apply loop optimizations
onto a specific function.

I appreciate for your help.

Thanks,
Murat