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/***************************************************************************************************
* Copyright (c) 2017-2018, NVIDIA CORPORATION. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted
* provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
* * Neither the name of the NVIDIA CORPORATION nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TOR (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
**************************************************************************************************/
/*! \file
\brief Implements efficient loading of the thread block-level tile from global memory and
storing
to shared memory.
*/
#pragma once
#include <cutlass/convert.h>
#include <cutlass/gemm/gemm_global_tile.h>
#include <cutlass/iterator_access.h>
namespace cutlass {
namespace gemm {
////////////////////////////////////////////////////////////////////////////////////////////////////
template <
/// The load iterator.
typename LoadIterator_,
/// The store iterator to copy to shared memory.
typename StoreIterator_,
/// The transformer to be applied after the data has been copied from global memory.
typename Transformer_>
struct GlobalLoadStreamBase {
/// The load iterator.
typedef LoadIterator_ LoadIterator;
/// The transformer.
typedef Transformer_ Transformer;
/// The store iterator to write to shared memory.
typedef StoreIterator_ StoreIterator;
/// The fragment that is copied from shared memory.
typedef typename LoadIterator::Fragment FetchedFragment;
/// The fragment that is obtained after the transformation by the transformer.
typedef typename Transformer::OutputFragment TransformedFragment;
/// Make sure the fragments match.
static_assert((platform::is_same<FetchedFragment, typename Transformer::InputFragment>::value),
"");
/// The output fragment.
typedef TransformedFragment Fragment;
/// Make sure the transformed fragment is the same as the store fragment.
static_assert((platform::is_same<TransformedFragment, typename StoreIterator::Fragment>::value),
"");
/// The layout.
static MatrixLayout::Kind const kLayout = LoadIterator::kLayout;
/// The scalar type of the iterator.
typedef typename LoadIterator::Scalar Scalar;
/// The pointer.
typedef typename LoadIterator::Pointer Pointer;
/// The index.
typedef typename LoadIterator::Index Index;
/// The params.
struct Params {
// The load iterator.
typename LoadIterator::Params load_iterator;
// The store iterator.
typename StoreIterator::Params store_iterator;
/// Setup the params.
template <typename GemmDesc_>
CUTLASS_HOST_DEVICE int initialize(GemmDesc_ const& desc, Pointer pointer, Index ld) {
int error_code = load_iterator.initialize(desc, pointer, ld);
if (error_code) {
return error_code;
}
return store_iterator.initialize();
}
};
/// The amount of storage in shared memory needed to store the tile.
typedef typename StoreIterator::SharedStorage SharedStoreStorage;
/// The storage in shared memory needed by that stream.
union SharedStorage {
// The load iterator.
typename LoadIterator::SharedStorage load_iterator;
// The store iterator.
SharedStoreStorage store_iterator;
};
/// Ctor.
CUTLASS_DEVICE GlobalLoadStreamBase(Params const& params,
SharedStorage& shared_storage,
Coord<3> const bounds,
Coord<3> const& block)
: load_iterator(params.load_iterator, bounds, block),
transformer(),
store_iterator(params.store_iterator, shared_storage.store_iterator)
{
fetched_fragment.clear();
}
/// Load the data from shared memory to the fetch fragment.
CUTLASS_DEVICE void copy() { iterator_load(load_iterator, fetched_fragment); }
/// Commit the data.
CUTLASS_DEVICE void commit() {
transformer.transform(fetched_fragment, transformed_fragment);
iterator_store(store_iterator, transformed_fragment);
store_iterator.inc_stage();
}
/// Move to the beginning of the residue code. That's a new code path in CUTLASS 1.0.1.
CUTLASS_DEVICE void move_to_residue(Index k) { load_iterator.move_to_residue(k); }
/// Execute the residue code.
CUTLASS_DEVICE void residue(Index k, bool skip_clear = false) {
load_iterator.residue(k);
if (!skip_clear) {
fetched_fragment.clear();
}
}
/// Rollback to the beginning of the GEMM-k dimension.
CUTLASS_DEVICE void rollback() { load_iterator.rollback(); }
/// The iterator.
LoadIterator load_iterator;
/// The fragment to fetch from shared memory.
FetchedFragment fetched_fragment;
/// The transformer.
Transformer transformer;
/// The fragment to convert the data after it has been fetched from shared memory.
TransformedFragment transformed_fragment;
/// The store iterator.
StoreIterator store_iterator;
};
////////////////////////////////////////////////////////////////////////////////////////////////////
template <
/// The load iterator.
typename LoadIterator_,
/// The store iterator to copy to shared memory.
typename StoreIterator_,
/// The transformer to be applied after the data has been copied from global memory.
typename Transformer_ = Copy<typename LoadIterator_::Fragment> >
struct GlobalLoadStream : public GlobalLoadStreamBase<LoadIterator_, StoreIterator_, Transformer_> {
/// The base class.
typedef GlobalLoadStreamBase<LoadIterator_, StoreIterator_, Transformer_> Base;
/// Ctor.
CUTLASS_DEVICE GlobalLoadStream(typename Base::Params const& params,
typename Base::SharedStorage& shared_storage,
Coord<3> const& bounds,
Coord<3> const& block)
: Base(params, shared_storage, bounds, block) {}
};
////////////////////////////////////////////////////////////////////////////////////////////////////
} // namespace gemm
} // namespace cutlass
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