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[flang][cuda] Avoid generating data transfer when calling size intrinsic #108081

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Merged
merged 1 commit into from
Sep 10, 2024
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[flang][cuda] Avoid generating data transfer when calling size intrinsic #108081

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3 changes: 3 additions & 0 deletions flang/lib/Evaluate/tools.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1011,6 +1011,9 @@ struct CollectCudaSymbolsHelper : public SetTraverse<CollectCudaSymbolsHelper,
}
// Overload some of the operator() to filter out the symbols that are not
// of interest for CUDA data transfer logic.
semantics::UnorderedSymbolSet operator()(const DescriptorInquiry &) const {
return {};
}
semantics::UnorderedSymbolSet operator()(const Subscript &) const {
return {};
}
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10 changes: 10 additions & 0 deletions flang/test/Lower/CUDA/cuda-data-transfer.cuf
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Expand Up @@ -353,3 +353,13 @@ end subroutine
! CHECK-LABEL: func.func @_QPsub17()
! CHECK: cuf.kernel<<<*, *>>>
! CHECK-NOT: cuf.data_transfer

subroutine sub18()
integer, device, allocatable :: a(:)
integer :: isz

isz = size(a)
end subroutine

! CHECK-LABEL: func.func @_QPsub18()
! CHECK-NOT: cuf.data_transfer