[llvm-dev] [LAI] Question about getDependences
Florian Hahn via llvm-dev
llvm-dev at lists.llvm.org
Thu Feb 18 10:24:18 PST 2021
Hi,
> On 18 Feb 2021, at 18:17, Dangeti Tharun kumar via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>
> Hi,
>
> I am using LAI->getDependences(), It returns a vector of Dependence objects in a Loop.
> If the loop is un-analyzable or parallel, an empty list is returned.
>
> for example:
>
> Loop A:
> for (int i = 0; i < N; i ++) {
> a[i] = c[i] + d[i];
> b[i] = c[i] * d[i];
> }
> Loop B:
> for (int i = 0; i < N; i++) {
> a[b[i]] = c[i] + d[i];
> c[i] = c[i - 1] + 1;
> }
>
> Loop A is parallel and Loop B has non-simple dependences(LAI bails out) for both the cases we get an empty set of dependences.
>
> Is there an API that can tell if LAI was successful in dependence computation?
I think canVectorizeMemory should do what you want (possibly in combination with getMaxSafeDepDistBytes
Cheers,
Florian
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