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1 : : //
2 : : // Class CIC
3 : : // First order/cloud-in-cell grid interpolation. Currently implemented as
4 : : // global functions, but in order to support higher or lower order interpolation,
5 : : // these should be moved into structs.
6 : : //
7 : :
8 : : namespace ippl {
9 : : namespace detail {
10 : : template <unsigned long Point, unsigned long Index, typename Weights>
11 : 575232 : KOKKOS_INLINE_FUNCTION constexpr typename Weights::value_type interpolationWeight(
12 : : const Weights& wlo, const Weights& whi) {
13 : : if constexpr (Point & (1 << Index)) {
14 : 287616 : return wlo[Index];
15 : : } else {
16 : 287616 : return whi[Index];
17 : : }
18 : : // device code cannot throw exceptions, but we need a
19 : : // dummy return to silence the warning
20 : : return 0;
21 : : }
22 : :
23 : : template <unsigned long Point, unsigned long Index, typename Indices>
24 : 575232 : KOKKOS_INLINE_FUNCTION constexpr typename Indices::value_type interpolationIndex(
25 : : const Indices& args) {
26 : : if constexpr (Point & (1 << Index)) {
27 : 287616 : return args[Index] - 1;
28 : : } else {
29 : 287616 : return args[Index];
30 : : }
31 : : // device code cannot throw exceptions, but we need a
32 : : // dummy return to silence the warning
33 : : return 0;
34 : : }
35 : :
36 : : template <unsigned long ScatterPoint, unsigned long... Index, typename View, typename T,
37 : : typename IndexType>
38 : 104832 : KOKKOS_INLINE_FUNCTION constexpr void scatterToPoint(
39 : : const std::index_sequence<Index...>&, const View& view,
40 : : const Vector<T, View::rank>& wlo, const Vector<T, View::rank>& whi,
41 : : const Vector<IndexType, View::rank>& args, const T& val) {
42 : 209664 : Kokkos::atomic_add(&view(interpolationIndex<ScatterPoint, Index>(args)...),
43 : 104832 : val * (interpolationWeight<ScatterPoint, Index>(wlo, whi) * ...));
44 : 104832 : }
45 : :
46 : : template <unsigned long... ScatterPoint, typename View, typename T, typename IndexType>
47 : 4992 : KOKKOS_INLINE_FUNCTION constexpr void scatterToField(
48 : : const std::index_sequence<ScatterPoint...>&, const View& view,
49 : : const Vector<T, View::rank>& wlo, const Vector<T, View::rank>& whi,
50 : : const Vector<IndexType, View::rank>& args, T val) {
51 : : // The number of indices is equal to the view rank
52 [ + - + - : 4992 : (scatterToPoint<ScatterPoint>(std::make_index_sequence<View::rank>{}, view, wlo, whi,
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53 : : args, val),
54 : : ...);
55 : 4992 : }
56 : :
57 : : template <unsigned long GatherPoint, unsigned long... Index, typename View, typename T,
58 : : typename IndexType>
59 : 8064 : KOKKOS_INLINE_FUNCTION constexpr typename View::value_type gatherFromPoint(
60 : : const std::index_sequence<Index...>&, const View& view,
61 : : const Vector<T, View::rank>& wlo, const Vector<T, View::rank>& whi,
62 : : const Vector<IndexType, View::rank>& args) {
63 : 8064 : return (interpolationWeight<GatherPoint, Index>(wlo, whi) * ...)
64 [ # # # # : 16128 : * view(interpolationIndex<GatherPoint, Index>(args)...);
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65 : : }
66 : :
67 : : template <unsigned long... GatherPoint, typename View, typename T, typename IndexType>
68 : 384 : KOKKOS_INLINE_FUNCTION constexpr typename View::value_type gatherFromField(
69 : : const std::index_sequence<GatherPoint...>&, const View& view,
70 : : const Vector<T, View::rank>& wlo, const Vector<T, View::rank>& whi,
71 : : const Vector<IndexType, View::rank>& args) {
72 : : // The number of indices is equal to the view rank
73 [ + - + - : 384 : return (gatherFromPoint<GatherPoint>(std::make_index_sequence<View::rank>{}, view, wlo,
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74 : : whi, args)
75 [ # # # # : 384 : + ...);
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76 : : }
77 : : } // namespace detail
78 : : } // namespace ippl
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