[TIR][CompactBufferAllocation] Improve upperbound estimation of buffer compaction #12527
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…r compaction (apache#12527) Hi, this change wants to add some minor updation to region estimator used by buffer compaction: - Add and clearify among `EstimateRegionStrictBound`, `EstimateRegionLowerBound` and `EstimateRegionUpperBound` Originally we have `EstimateRegionLowerBound`, actually it implements strict bound estimation IMO. Now add `upper` and `strict` version for where we actually want them. - When estimating upperbounds (eg. in buffer compaction), try estimate each dimension independently when they are dependent accesses where `EstimateRegionLowerBound` is expected to fail. Eg, `A[i, i], 3 < i < 16` fails via `EstimateRegionLowerBound` who check indices be independent. But we can still try best to invoke strict bound analysis on each dimension individually. - If range->extent == 1 for `EvalSet(range, dom)`, invoke `EvalSet(range->min, dom)` instead. Eg, `EvalSet([k*k, k*k+1), dom_k)` results to [-inf, +inf] due to current algorithm limitation but `EvalSet(k*k, dom_k)` results to a range which makes more sense.
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Hi, this change wants to add some minor updation to region estimator used by buffer compaction:
Add and clearify among
EstimateRegionStrictBound,EstimateRegionLowerBoundandEstimateRegionUpperBoundOriginally we have
EstimateRegionLowerBound, actually it implements strict bound estimation IMO. Now addupperandstrictversion for where we actually want them.When estimating upperbounds (eg. in buffer compaction), try estimate each dimension independently when they are dependent accesses where
EstimateRegionLowerBoundis expected to fail.Eg,
A[i, i], 3 < i < 16fails viaEstimateRegionLowerBoundwho check indices be independent. But we can still try best to invoke strict bound analysis on each dimension individually.If range->extent == 1 for
EvalSet(range, dom), invokeEvalSet(range->min, dom)instead.Eg,
EvalSet([k*k, k*k+1), dom_k)results to [-inf, +inf] due to current algorithm limitation butEvalSet(k*k, dom_k)results to a range which makes more sense.cc @Hzfengsy @junrushao @junrushao1994 @spectrometerHBH