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/*
* Copyright 2021 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef LYRA_CODEC_SPARSE_MATMUL_COMPUTE_THREAD_BOUNDS_H_
#define LYRA_CODEC_SPARSE_MATMUL_COMPUTE_THREAD_BOUNDS_H_
#include <vector>
namespace csrblocksparse {
// Class to compute and store the bounds of each thread used in a computation,
// and to provide corresponding spans of vectors.
class ThreadBounds {
public:
ThreadBounds() : block_width_(0), block_height_(0) {}
void PrepareForThreads(int block_width, int block_height, int num_threads,
int reduced_rows_per_cache_row, int reduced_rows,
const int* nnz_per_row);
// Functions that offset the appropriate type to the start of the data
// needed by the given thread id (|tid|).
template <typename WeightType>
const WeightType* OffsetWeights(const WeightType* weights, int tid) const {
return weights + weight_starts_[tid];
}
template <typename RhsIndType>
const RhsIndType* OffsetRhsIndices(const RhsIndType* rhs_indices,
int tid) const {
return rhs_indices + rhs_indices_starts_[tid];
}
template <typename BiasType>
const BiasType* OffsetBias(const BiasType* bias, int tid) const {
return bias + bias_starts_[tid];
}
template <typename OutType>
OutType* OffsetOutput(OutType* output, int tid) const {
return output + block_height_ * row_starts_[tid];
}
int StartRow(int tid) const { return row_starts_[tid]; }
const std::vector<int>& row_starts() const { return row_starts_; }
private:
// Computes the block row (reduced) index of the start of each thread.
void ComputeThreadSplitPoints(int num_threads, int reduced_rows_per_cache_row,
int reduced_rows, const int* nnz_per_row);
// Sizes of a sparse block.
int block_width_;
int block_height_;
// Start indices of each data type by thread-id with an extra value at the
// end.
std::vector<int> row_starts_;
std::vector<int> weight_starts_;
std::vector<int> rhs_indices_starts_;
std::vector<int> bias_starts_;
};
} // namespace csrblocksparse
#endif // LYRA_CODEC_SPARSE_MATMUL_COMPUTE_THREAD_BOUNDS_H_
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