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...his comment for why they were needed and perhaps a better way to fix it: https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_llvm_llvm-2Dproject_commit_d143c65de3c884d09197da279d2f04f094efaf15-23diff-2D57473b376037dd3637516348b9b02556L3274&d=DwIFAw&c=jf_iaSHvJObTbx-siA1ZOg&r=aihobyOnVzXW7OPSK1-NiSYQkq7oP3ZSUVc4BemvrVo&m=46eKxI_sFjjeBzn7X-OLXSEUwHN-HVCD16TF9OuyIqc&s=adPvJDhPtFMlaTWihZmvWjXqFUFHDnzcV84oaDGlryM&e= Any improvements to the delinearisation code would be most welcome. Dave From: llvm-dev <llvm-dev-bounces at lists.llvm.org> on behalf of Bardia Mahjour vi...

Dear LLVM community, we would like to form a working group that focuses on loop optimizations and the loop optimization pipeline in LLVM. This working group would meet at a regular cadence (weekly or bi-weekly depending on people's schedules) and discuss topics relevant to loop optimizations. These topics would include: - Implementation of current loop optimizations - Proposals for

Thanks Florian. Tim you said: > Some cases can be undone by rematerialization, but not all, and it can involve a lot of effort which increases compile time. Do you have examples of cases where rematerialization is not possible? We are interested in learning about any previous attempts at trying to address the issue in RA. Have you tried it? Bardia Mahjour Compiler Optimizations IBM Toronto

...for why they were needed and perhaps a better way to fix > it: > https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_llvm_llvm-2Dproject_commit_d143c65de3c884d09197da279d2f04f094efaf15-23diff-2D57473b376037dd3637516348b9b02556L3274&d=DwIFAw&c=jf_iaSHvJObTbx-siA1ZOg&r=aihobyOnVzXW7OPSK1-NiSYQkq7oP3ZSUVc4BemvrVo&m=46eKxI_sFjjeBzn7X-OLXSEUwHN-HVCD16TF9OuyIqc&s=adPvJDhPtFMlaTWihZmvWjXqFUFHDnzcV84oaDGlryM&e= > > > Any improvements to the delinearisation code would be most welcome. > Dave > > > > > From: llvm-dev <llvm-dev-bounces at list...

Hi all, I have been looking at the `DependenceAnalysis` pass in `llvm/include/llvm/Analysis/DependenceAnalysis.h`. In order for this analysis to produce accurate dependence vectors for multi-dimensional arrays in nested loops, it needs to "delinearize" array element accesses to recover the subscripts in each dimension of the array. I believe that the current implementation of

Hello Yes, I agree that the SCEV cannot be simplified. Is my understanding correct that it is passed to a function like "isKnownNegative"? Which could still be able to prove is always true. The delinearisation may be valid, depending on exactly how you define delinearisation (under what conditions it should be giving results). It would be invalid for DA to return a dependency of [0

Hi all, I am trying to use the dependence analyzer in a pass that I am writing and I was surprised to see an incorrect behavior when I try to query DependenceInfo for dependences between instructions. Specifically, if the two instructions are loads/stores accessing an array in a loop, the depend() method would return a dependence regardless of the order of instructions specified. (i.e. if the two