[LLVMdev] input and output values from a loop

[Imran Ashraf]

Hi there,

I want to get input and output values from a loop. For this I am doing 
something like this:

DominatorTree &DT = getAnalysis<DominatorTreeWrapperPass>().getDomTree();
CodeExtractor Extractor(DT, *L);
Extractor.findInputsOutputs(inputs, outputs);

When I print the input and output values for the following test code:

void aFunc(void)
{
     int sum=0;
     puts("aFunc()");
     for (int i = 0; i < 10; i++)
     {
         int fact=i*2;
         sum=sum+i+fact;
     }
     printf("%d",sum);
}

I get the following:

Inputs
type i32*      name i
type i32*      name fact
type i32*      name sum

Outputs

However, I was expecting the output to be:

Inputs
type i32*      name sum

Outputs
type i32*      name sum

To my understanding, i and fact are declared inside the loop, hence they 
are neither input nor output. Secondly, sum is being used outside the 
loop, hence should appear in outputs.

Is this the right way of doing it or am i doing some thing wrong?

Complete working code can be found at:
https://github.com/imranashraf/llvm-pass-exercise1

Thanks in advance for help.
Kind regards,