[LLVMdev] Problem getting LoopInfo inside non-LoopPass

[Ryan Taylor]

 Thanks for the info. Curious, do you know if there is an opt that will put
all loops, including nested ones, in functions (ie each loop in it's own
function)? What I'm trying to do is create a way for each loop to have only
one exit. I want all loops to be single exit loops?

  I can write my own pass but I'd rather not. I think that if I can put
each loop into it's own function then call merge return that might do it.
Ideas?

On Thu, Dec 1, 2011 at 12:32 AM, Pankaj Gode <godepankaj at yahoo.com> wrote:

> In addition to the link below, please check for functions like
> "llvm.debug.declare", "llvm.debug.value", as you will not get LoopInfo for
> these.
>
> Pankaj
>
>
>  *From:* Devang Patel <dpatel at apple.com>
> *To:* Ryan Taylor <ryta1203 at gmail.com>
> *Cc:* llvmdev at cs.uiuc.edu
> *Sent:* Wednesday, November 30, 2011 11:08 PM
>
> *Subject:* Re: [LLVMdev] Problem getting LoopInfo inside non-LoopPass
>
> Ryan,
>
> See http://lists.cs.uiuc.edu/pipermail/llvmdev/2011-November/045423.html
>
> -
> Devang
>
> On Nov 29, 2011, at 6:59 PM, Ryan Taylor wrote:
>
> > The following code is causing an "UNREACHABLE executed!" and a stack
> dump, any ideas?
> >
> > namespace {
> >  struct myPass : public CallGraphSCCPass {
> >  static char ID;
> >  myPass() : CallGraphSCCPass(ID) {}
> >  virtual void getAnalysisUsage(AnalysisUsage &AU) const {
> >            AU.setPreservesAll();
> >            AU.addRequired<LoopInfo>();
> >  }
> >  virtual bool runOnSCC(CallGraphSCC &SCC) {
> >        for (CallGraphSCC::iterator CGNodeItr = SCC.begin(),
> CFNodeItrE=SCC.end();CGNodeItr!=CGNodeItrE;++CGNodeItr)  }
> >                  const CallGraphNode *CGNode = *CGNodeItr;
> >                  Function *F = CGNode->getFunction();
> >                  if (!F->isDeclaration())
> >                                LoopInfo &LI = getAnalysis<LoopInfo>(*F);
> >        }
> >        return false;
> >    }
> >  };
> >    char myPass::ID = 0;
> >    static RegisterPass<myPass> X("myPass", "This is my pass", false,
> false);
> > }
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