[llvm-dev] Unable to Get Induction Variable

[Kyle Chen via llvm-dev]

Hi,

I have a simple pass that prints the induction variable of each loop in a module, but it doesn't work for the following C program:

void example() {

    int array[100];

    for (int i = 0; i < 100; i++) {

      if (i % 2 == 0) {

        array[i] = 2;

      }

      else {

        array[i] = 1;

      }

    }

}

Calling the getInductionVariable() function returns nothing but i is clearly an induction variable in the above function.

I'm using the opt command with the following flags to run my pass:

-mem2reg -instnamer -lcssa -loop-rotate


Any suggestions on how to fix this issue would be appreciated.


Thanks,
Kyle


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