fragment_iterator_simt.h
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#pragma once
#include "cutlass/array.h"
#include "cutlass/layout/matrix.h"
#include "cutlass/epilogue/warp/simt_policy.h"
namespace cutlass {
namespace epilogue {
namespace warp {
template <
typename WarpShape,
typename Operator,
typename Layout,
typename MmaSimtPolicy
>
class FragmentIteratorSimt;
template <
typename WarpShape_,
typename Operator_ ,
typename MmaSimtPolicy_
>
class FragmentIteratorSimt<WarpShape_, Operator_, layout::RowMajor, MmaSimtPolicy_> {
public:
using WarpShape = WarpShape_;
using Operator = Operator_;
using Layout = layout::RowMajor;
using Policy = SimtPolicy<WarpShape, Operator, Layout, MmaSimtPolicy_>;
using Fragment = Array<
typename Operator::ElementC,
Policy::kElementsPerIteration>;
using AccumulatorTile = Array<
typename Operator::ElementC,
Policy::kAccumulatorElementCount>;
using OutputAccumulatorTile = AccumulatorTile;
static int const kIterations = Policy::kIterations;
private:
using AccessType = Array<typename Operator::ElementC, Policy::kElementsPerAccess>;
private:
//
// Data members
//
AccessType const *accumulators_;
int index_;
public:
CUTLASS_HOST_DEVICE
FragmentIteratorSimt(AccumulatorTile const &accum):
accumulators_(reinterpret_cast<AccessType const *>(&accum)),
index_(0) {
}
CUTLASS_HOST_DEVICE
FragmentIteratorSimt &operator++() {
++index_;
return *this;
}
CUTLASS_HOST_DEVICE
FragmentIteratorSimt &operator--() {
--index_;
return *this;
}
CUTLASS_HOST_DEVICE
void load(Fragment &frag, int index_offset = 0) const {
AccessType *frag_ptr = reinterpret_cast<AccessType *>(&frag);
CUTLASS_PRAGMA_UNROLL
for (int n = 0; n < Policy::kAccessesPerIteration; ++n) {
int accumulator_access_offset = index_ * Policy::kAccessesPerIteration + n;
frag_ptr[n] = accumulators_[accumulator_access_offset];
}
}
};
} // namespace warp
} // namespace epilogue
} // namespace cutlass
cutlass
Definition: aligned_buffer.h:35
cutlass::epilogue::warp::FragmentIteratorSimt< WarpShape_, Operator_, layout::RowMajor, MmaSimtPolicy_ >::OutputAccumulatorTile
AccumulatorTile OutputAccumulatorTile
Definition: fragment_iterator_simt.h:90
cutlass::epilogue::warp::SimtPolicy
Definition: simt_policy.h:50
cutlass::epilogue::warp::FragmentIteratorSimt< WarpShape_, Operator_, layout::RowMajor, MmaSimtPolicy_ >::WarpShape
WarpShape_ WarpShape
Definition: fragment_iterator_simt.h:73
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::FragmentIteratorSimt
Fragment iterator for SIMT accumulator arrangements.
Definition: fragment_iterator_simt.h:60
cutlass::epilogue::warp::FragmentIteratorSimt< WarpShape_, Operator_, layout::RowMajor, MmaSimtPolicy_ >::load
CUTLASS_HOST_DEVICE void load(Fragment &frag, int index_offset=0) const
Loads a fragment from the referenced part of the accumulator tile.
Definition: fragment_iterator_simt.h:138
CUTLASS_HOST_DEVICE
#define CUTLASS_HOST_DEVICE
Definition: cutlass.h:89
cutlass::epilogue::warp::FragmentIteratorSimt< WarpShape_, Operator_, layout::RowMajor, MmaSimtPolicy_ >::AccumulatorTile
Array< typename Operator::ElementC, Policy::kAccumulatorElementCount > AccumulatorTile
This is the complete warp-level accumulator tile.
Definition: fragment_iterator_simt.h:88
cutlass::epilogue::warp::FragmentIteratorSimt< WarpShape_, Operator_, layout::RowMajor, MmaSimtPolicy_ >::Fragment
Array< typename Operator::ElementC, Policy::kElementsPerIteration > Fragment
This is the fragment size produced by one access of the iterator.
Definition: fragment_iterator_simt.h:83
cutlass::epilogue::warp::FragmentIteratorSimt< WarpShape_, Operator_, layout::RowMajor, MmaSimtPolicy_ >::operator--
CUTLASS_HOST_DEVICE FragmentIteratorSimt & operator--()
Decrements.
Definition: fragment_iterator_simt.h:131
cutlass::layout::RowMajor
Mapping function for row-major matrices.
Definition: layout/matrix.h:50
cutlass::epilogue::warp::FragmentIteratorSimt< WarpShape_, Operator_, layout::RowMajor, MmaSimtPolicy_ >::FragmentIteratorSimt
CUTLASS_HOST_DEVICE FragmentIteratorSimt(AccumulatorTile const &accum)
Constructs an iterator.
Definition: fragment_iterator_simt.h:116
matrix.h
Defines layout functions used by TensorRef and derived classes.
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::FragmentIteratorSimt< WarpShape_, Operator_, layout::RowMajor, MmaSimtPolicy_ >::operator++
CUTLASS_HOST_DEVICE FragmentIteratorSimt & operator++()
Increments.
Definition: fragment_iterator_simt.h:124