[llvm-dev] [LAI] Question about getDependences

[Florian Hahn via llvm-dev]

> On 18 Feb 2021, at 18:57, Dangeti Tharun kumar <cs15mtech11002 at iith.ac.in> wrote:
> 
> Hi Florian,
> 
> Thanks for the reply.
> 
> We have tried a condition like this:
> 
> if (LAI.getMaxSafeDepDistBytes() == -1ULL && !LAI.canVectorizeMemory()) {
>   print("Unknown dependences in loop");
>   return false;
> }
> 
> Looks like LAI.getMaxSafeDepDistBytes() is not always capturing the distance for non-vectorizable loops.

I think getMaxSafeDepDistBytes should only be used if canVectorizeMemory is true. It sounds like you might be asking LAI questions it isn’t really built for. If you are interested in information about dependences and do not require runtime-check generation, https://github.com/llvm/llvm-project/blob/main/llvm/include/llvm/Analysis/DependenceAnalysis.h <https://github.com/llvm/llvm-project/blob/main/llvm/include/llvm/Analysis/DependenceAnalysis.h> might give you the information you need.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20210222/f570c676/attachment.html>