[LLVMdev] llvm getDependency() for ICMP instructions is UNKNOWN

[Alexandru Ionut Diaconescu]

Hello everyone !

I am trying to get the dependencies for the variables of ICMP instructions.
Do you know if I can use an already existing method?

I tried to use getDependency() method of class MemoryDependenceAnalysis.
Does it work only for particular instruction types? Its definition is

    MemDepResult MemoryDependenceAnalysis::getDependency ( Instruction *
QueryInst )
When I running my pass

    if ( !(Inst->getOpcode() == Instruction::ICmp) )
          continue;
    ......
    MemDepResult Res = MDA.getDependency(Inst);
    .....
    if (!Res.isNonLocal()) {
      Deps[Inst].insert(std::make_pair(getInstTypePair(Res),
                                       static_cast<BasicBlock *>(0)));
    } else //it does not enter here
    .....
    .....
    errs()<<*Inst;
    errs() << DepTypeStr[type];
    if (DepBB) {
    errs() << DepBB;
    }
    if (DepInst) {
    errs() << *DepInst;
    .....
It prints all the imcp instructions and UNKNOWN. So I think I cannot use
http://llvm.org/docs/doxygen/html/MemoryDependenceAnalysis_8h_source.html#l00151for
ICMP. Do you know if I can use this method or another one?

Thank you !
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