CUTLASS: tile_iterator_simt.h Source File

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tile_iterator_simt.h
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29 #pragma once
30
31 #include "cutlass/array.h"
32 #include "cutlass/layout/matrix.h"
33 #include "cutlass/layout/pitch_linear.h"
34
35 #include "cutlass/epilogue/warp/simt_policy.h"
36
37 #define CUTLASS_SIMT_EPILOGUE_USE_SCALAR_STORES 1
38
40
41 namespace cutlass {
42 namespace epilogue {
43 namespace warp {
44
46
48 template <
49 typename WarpShape,
50 typename Operator,
51 typename Element,
52 typename Layout,
53 typename MmaSimtPolicy
54 >
55 class TileIteratorSimt;
56
58
60 template <
61 typename WarpShape_,
62 typename Operator_,
63 typename Element_,
64 typename MmaSimtPolicy_
65 >
66 class TileIteratorSimt<WarpShape_, Operator_, Element_, layout::RowMajor, MmaSimtPolicy_> {
67 public:
68
69 using WarpShape = WarpShape_;
70 using Operator = Operator_;
71 using Element = Element_;
72 using Layout = layout::RowMajor;
73
74 using TensorRef = TensorRef<Element, Layout>;
75 using TensorCoord = MatrixCoord;
76 using Index = typename TensorRef::Index;
77 using LongIndex = typename TensorRef::LongIndex;
78
79 using Policy = SimtPolicy<WarpShape, Operator, Layout, MmaSimtPolicy_>;
80
82 using Shape = MatrixShape<
83 Policy::kRowsPerIteration,
84 WarpShape::kN
85 >;
86
88 using Fragment = Array<
89 typename Operator::ElementC,
90 Policy::kElementsPerIteration>;
91
93 using AccumulatorTile = Array<
94 typename Operator::ElementC,
95 Policy::kAccumulatorElementCount>;
96
98 static int const kIterations = Policy::kIterations;
99
101 using Padding = MatrixShape<
102 0,
103 4 * Policy::kElementsPerAccess>;
104
105 private:
106
108 using AccessType = AlignedArray<Element, Policy::kElementsPerAccess>;
109
110 //
111 // Data members
112 //
113
115 AccessType *pointer_;
116
118 Layout layout_;
119
120 public:
121
123 CUTLASS_HOST_DEVICE
124 TileIteratorSimt(): pointer_(nullptr) { }
125
127 CUTLASS_HOST_DEVICE
128 TileIteratorSimt(
129 TensorRef const &ref,
130 unsigned lane_id
131 ):
132 pointer_(reinterpret_cast<AccessType *>(ref.data())),
133 layout_(ref.stride()[0] / Policy::kElementsPerAccess) {
134
135 auto lane_layout = Policy::MmaSimtPolicy::get_lane_layout();
136 MatrixCoord lane_offset = lane_layout.inverse(lane_id);
137
138 pointer_ += layout_(lane_offset);
139 }
140
142 CUTLASS_HOST_DEVICE
143 TileIteratorSimt & add_pointer_offset(Index pointer_offset) {
144 pointer_ += pointer_offset / Policy::kElementsPerAccess;
145 return *this;
146 }
147
149 CUTLASS_HOST_DEVICE
150 TileIteratorSimt & add_tile_offset(TensorCoord const &tile_offset) {
151
152 pointer_ += layout_({
153 tile_offset.row() * Shape::kRow,
154 (tile_offset.column() * Shape::kColumn / Policy::kElementsPerAccess)
155 });
156
157 return *this;
158 }
159
161 CUTLASS_HOST_DEVICE
162 TileIteratorSimt & operator+=(TensorCoord const &tile_offset) {
163
164 add_tile_offset(tile_offset);
165
166 return *this;
167 }
168
170 CUTLASS_HOST_DEVICE
171 void store_with_pointer_offset(Fragment const &frag, Index pointer_offset) {
172 #if CUTLASS_SIMT_EPILOGUE_USE_SCALAR_STORES
173 // de-vectorized stores
174 using ScalarAccessType = AlignedArray<Element, 1>;
175 ScalarAccessType const *scalarFragPtr = reinterpret_cast<ScalarAccessType const *>(&frag);
176 ScalarAccessType *scalarPointer = reinterpret_cast<ScalarAccessType *>(pointer_);
177
178 CUTLASS_PRAGMA_UNROLL
179 for (int n = 0; n < Policy::kAccessesPerIteration; ++n) {
180 CUTLASS_PRAGMA_UNROLL
181 for (int s = 0; s < Policy::kElementsPerAccess; s++) {
182 scalarPointer[n * Policy::MmaSimtPolicy::WarpShape::kColumn * Policy::kElementsPerAccess + s] = scalarFragPtr[n * Policy::kElementsPerAccess + s];
183 }
184 }
185 #else
186 // original vector stores
187 AccessType const *frag_ptr = reinterpret_cast<AccessType const *>(&frag);
188 CUTLASS_PRAGMA_UNROLL
189 for (int n = 0; n < Policy::kAccessesPerIteration; ++n) {
190 pointer_[n * Policy::MmaSimtPolicy::WarpShape::kColumn] = frag_ptr[n];
191 }
192 #endif
193 }
194
196 CUTLASS_HOST_DEVICE
197 void store(Fragment const &frag) {
198 store_with_pointer_offset(frag, 0);
199 }
200
202 CUTLASS_HOST_DEVICE
203 void load_with_pointer_offset(Fragment &frag, Index pointer_offset) const {
204
205 AccessType *frag_ptr = reinterpret_cast<AccessType *>(&frag);
206
207 CUTLASS_PRAGMA_UNROLL
208 for (int n = 0; n < Policy::kAccessesPerIteration; ++n) {
209 frag_ptr[n] = pointer_[n * Policy::MmaSimtPolicy::WarpShape::kColumn];
210 }
211 }
212
214 CUTLASS_HOST_DEVICE
215 void load(Fragment &frag) const {
216 load_with_pointer_offset(frag, 0);
217 }
218 };
219
221
222 } // namespace warp
223 } // namespace epilogue
224 } // namespace cutlass
225
cutlass::MatrixShape
Describes the size of a matrix tile.
Definition: matrix_shape.h:42
cutlass::MatrixCoord::column
CUTLASS_HOST_DEVICE Index const & column() const
Returns the column of the coordinate.
Definition: matrix_coord.h:85
cutlass
Definition: aligned_buffer.h:35
cutlass::epilogue::warp::TileIteratorSimt< WarpShape_, Operator_, Element_, layout::RowMajor, MmaSimtPolicy_ >::AccumulatorTile
Array< typename Operator::ElementC, Policy::kAccumulatorElementCount > AccumulatorTile
This is the complete warp-level accumulator tile.
Definition: tile_iterator_simt.h:95
cutlass::AlignedArray
Aligned array type.
Definition: array.h:511
cutlass::epilogue::warp::TileIteratorSimt< WarpShape_, Operator_, Element_, layout::RowMajor, MmaSimtPolicy_ >::Fragment
Array< typename Operator::ElementC, Policy::kElementsPerIteration > Fragment
This is the fragment size produced by one access of the iterator.
Definition: tile_iterator_simt.h:90
cutlass::epilogue::warp::TileIteratorSimt< WarpShape_, Operator_, Element_, layout::RowMajor, MmaSimtPolicy_ >::Index
typename TensorRef::Index Index
Definition: tile_iterator_simt.h:76
cutlass::MatrixCoord::row
CUTLASS_HOST_DEVICE Index const & row() const
Returns the row of the coordinate.
Definition: matrix_coord.h:77
cutlass::epilogue::warp::TileIteratorSimt< WarpShape_, Operator_, Element_, layout::RowMajor, MmaSimtPolicy_ >::LongIndex
typename TensorRef::LongIndex LongIndex
Definition: tile_iterator_simt.h:77
cutlass::epilogue::warp::SimtPolicy
Definition: simt_policy.h:50
cutlass::epilogue::warp::TileIteratorSimt< WarpShape_, Operator_, Element_, layout::RowMajor, MmaSimtPolicy_ >::load
CUTLASS_HOST_DEVICE void load(Fragment &frag) const
Load.
Definition: tile_iterator_simt.h:215
array.h
Statically sized array of elements that accommodates all CUTLASS-supported numeric types and is safe ...
CUTLASS_PRAGMA_UNROLL
#define CUTLASS_PRAGMA_UNROLL
Definition: cutlass.h:110
cutlass::epilogue::warp::TileIteratorSimt< WarpShape_, Operator_, Element_, layout::RowMajor, MmaSimtPolicy_ >::store
CUTLASS_HOST_DEVICE void store(Fragment const &frag)
Store.
Definition: tile_iterator_simt.h:197
cutlass::epilogue::warp::TileIteratorSimt< WarpShape_, Operator_, Element_, layout::RowMajor, MmaSimtPolicy_ >::add_tile_offset
CUTLASS_HOST_DEVICE TileIteratorSimt & add_tile_offset(TensorCoord const &tile_offset)
advances in units of whole tiles along the logical coordinate space of the tensor ...
Definition: tile_iterator_simt.h:150
nullptr
#define nullptr
nullptr
Definition: platform.h:144
cutlass::TensorRef< Element, Layout >
cutlass::epilogue::warp::TileIteratorSimt< WarpShape_, Operator_, Element_, layout::RowMajor, MmaSimtPolicy_ >::store_with_pointer_offset
CUTLASS_HOST_DEVICE void store_with_pointer_offset(Fragment const &frag, Index pointer_offset)
Store.
Definition: tile_iterator_simt.h:171
cutlass::epilogue::warp::TileIteratorSimt< WarpShape_, Operator_, Element_, layout::RowMajor, MmaSimtPolicy_ >::add_pointer_offset
CUTLASS_HOST_DEVICE TileIteratorSimt & add_pointer_offset(Index pointer_offset)
Adds a pointer offset.
Definition: tile_iterator_simt.h:143
cutlass::epilogue::warp::TileIteratorSimt< WarpShape_, Operator_, Element_, layout::RowMajor, MmaSimtPolicy_ >::TileIteratorSimt
CUTLASS_HOST_DEVICE TileIteratorSimt(TensorRef const &ref, unsigned lane_id)
Constructor from TensorRef.
Definition: tile_iterator_simt.h:128
CUTLASS_HOST_DEVICE
#define CUTLASS_HOST_DEVICE
Definition: cutlass.h:89
cutlass::epilogue::warp::TileIteratorSimt< WarpShape_, Operator_, Element_, layout::RowMajor, MmaSimtPolicy_ >::TileIteratorSimt
CUTLASS_HOST_DEVICE TileIteratorSimt()
Default constructor.
Definition: tile_iterator_simt.h:124
cutlass::TensorRef::Index
typename Layout::Index Index
Index type.
Definition: tensor_ref.h:165
cutlass::layout::RowMajor
Mapping function for row-major matrices.
Definition: layout/matrix.h:50
matrix.h
Defines layout functions used by TensorRef and derived classes.
pitch_linear.h
Defines layout functions used by TensorRef and derived classes for pitch-linear memory.
cutlass::epilogue::warp::TileIteratorSimt< WarpShape_, Operator_, Element_, layout::RowMajor, MmaSimtPolicy_ >::operator+=
CUTLASS_HOST_DEVICE TileIteratorSimt & operator+=(TensorCoord const &tile_offset)
Definition: tile_iterator_simt.h:162
cutlass::epilogue::warp::TileIteratorSimt< WarpShape_, Operator_, Element_, layout::RowMajor, MmaSimtPolicy_ >::load_with_pointer_offset
CUTLASS_HOST_DEVICE void load_with_pointer_offset(Fragment &frag, Index pointer_offset) const
Load.
Definition: tile_iterator_simt.h:203
simt_policy.h
Defines basic structures needed for implementing the warp-scoped phase of the epilogue. These quantities assume a &#39;column-major&#39; arrangement of SimtOp instructions, of which a row-oriented slice is visible per iteration.
cutlass::epilogue::warp::TileIteratorSimt< WarpShape_, Operator_, Element_, layout::RowMajor, MmaSimtPolicy_ >::WarpShape
WarpShape_ WarpShape
Definition: tile_iterator_simt.h:69
cutlass::MatrixCoord
Definition: matrix_coord.h:39
cutlass::epilogue::warp::TileIteratorSimt
Template for reading and writing tiles of accumulators to shared memory.
Definition: tile_iterator_simt.h:55
cutlass::TensorRef::LongIndex
typename Layout::LongIndex LongIndex
Long index used for pointer offsets.
Definition: tensor_ref.h:168