[llvm-dev] loop canonical variables

[Anastasiya Ruzhanskaya via llvm-dev]

I call this function and it returns only "i" in my example.  Are there any
ways to return "j" also?

2017-07-25 19:11 GMT+02:00 Michael Kruse <llvmdev at meinersbur.de>:

> There is Loop::getCanonicalInductionVariable()
>
> You may need to run the "-indvars" (IndVarSimplify) pass before it
> returns a value. I am not sure it normalizes the step size to 1 in all
> cases.
>
> Michael
>
> 2017-07-25 18:12 GMT+02:00 Anastasiya Ruzhanskaya via llvm-dev
> <llvm-dev at lists.llvm.org>:
> > Hello,
> > I need to perform the analysis of loop induction variables. However, as I
> > understood, directly it is possible to extract only a canonical induction
> > variable which is only one. If I have multiple induction variables with
> the
> > step not one, are there any methods to extract their phi node?
> >
> >         int a[10];
> >         int b[10];
> >         for (int i = 0, j = 1; i < 10, j < 10; i++, j+=2) {
> >                 a[i] = i+1;
> >                 b[j] = j+1;
> >         }
> >         printf("%d",(b[1] + a[1]));
> >         return (b[1] + a[1]);
> >
> > this is a brief example, I want to track i and j (smth is not
> initialized in
> > this code, but it doesn't matter)
> >
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
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> >
>
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