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Add padding to Grid struct in CellLocatorTwoLevel

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There appears to be a bug in CUDA 9.2 where if you have a class that
contains a struct that itself has to have padding in the middle for
alignment purposes and you then put that class in a union with other
classes, it seems like that padding can cause problems with other
objects in the union.
This commit is contained in:
Kenneth Moreland 2021-03-30 09:01:08 -06:00
parent e480fd7a24
commit 9816c422b1
1 changed files with 5 additions and 0 deletions
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5
vtkm/exec/CellLocatorTwoLevel.h
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@ -36,6 +36,10 @@ using FloatVec3 = vtkm::Vec3f;
struct Grid
{
DimVec3 Dimensions;
// Bug in CUDA 9.2 where having this gap for alignment was for some reason setting garbage
// in a union with other cell locators (or perhaps not properly copying data). This appears
// to be fixed by CUDA 10.2.
DimensionType Padding;
FloatVec3 Origin;
FloatVec3 BinSize;
};
@ -54,6 +58,7 @@ VTKM_EXEC inline vtkm::Id ComputeFlatIndex(const DimVec3& idx, const DimVec3 dim
VTKM_EXEC inline Grid ComputeLeafGrid(const DimVec3& idx, const DimVec3& dim, const Grid& l1Grid)
{
return { dim,
0,
l1Grid.Origin + (static_cast<FloatVec3>(idx) * l1Grid.BinSize),
l1Grid.BinSize / static_cast<FloatVec3>(dim) };
}