[LLVMdev] Fwd: getCanonicalInductionVariable

[Will Dietz]

Forwarding to list :)

~Will

---------- Forwarded message ----------
From: Malveeka Tewari <mtewari at eng.ucsd.edu>
Date: Sun, May 22, 2011 at 12:38 AM
Subject: Re: [LLVMdev] getCanonicalInductionVariable
To: willdtz at gmail.com


Adding -mem2reg fixed the problem !
Thanks a lot!
Malveeka

On Sat, May 21, 2011 at 9:47 PM, Will Dietz <willdtz at gmail.com> wrote:
>
> Also, make sure you're running the necessary transform passes as well,
> I've run into this testing my analysis on unoptimized code.
>
> There are various loop/induction variable passes, and offhand I think
> things like -mem2reg help too.
>
> Good luck!
>
> ~Will
>
> On Sat, May 21, 2011 at 8:45 PM, Arushi Aggarwal <arushi987 at gmail.com> wrote:
> > Hi,
> > What does your LLVM IR look like. Are you sure the loop hasnt been optimized
> > away?
> > Arushi
> >
> > On Sat, May 21, 2011 at 5:52 PM, Malveeka Tewari <mtewari at eng.ucsd.edu>
> > wrote:
> >>
> >> Hi
> >> I have the followed code for which I am writing a loop pass.
> >> int main() {
> >>   int i = 0;
> >>   for (i=0; i<20; i++) {
> >>     printf ("hello world %d\n", i);
> >>   }
> >>   return 0;
> >> }
> >> In the function runOnLoop, I have the following instruction
> >> PHINode *indv = NULL;
> >> indv = L->getCanonicalInductionVariable();
> >> However, when I check indv is always set to NULL.
> >> Since the code has a canonical induction variable, I was expecting the
> >> endv to start pointing to the induction var phi node.
> >> Please let me what I'm missing here
> >> Thanks
> >> Malveeka
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