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/*
* Copyright 2021 Blender Foundation
*
* 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.
*/
#pragma once
CCL_NAMESPACE_BEGIN
/* Given an array of states, build an array of indices for which the states
* are active and sorted by a given key. The prefix sum of the number of active
* states per key must have already been computed.
*
* TODO: there may be ways to optimize this to avoid this many atomic ops? */
#include "util/util_atomic.h"
#define GPU_PARALLEL_SORTED_INDEX_DEFAULT_BLOCK_SIZE 512
#define GPU_PARALLEL_SORTED_INDEX_INACTIVE_KEY (~0)
template<uint blocksize, typename GetKeyOp>
__device__ void gpu_parallel_sorted_index_array(const uint num_states,
int *indices,
int *num_indices,
int *key_prefix_sum,
GetKeyOp get_key_op)
{
const uint state_index = ccl_gpu_block_idx_x * blocksize + ccl_gpu_thread_idx_x;
const int key = (state_index < num_states) ? get_key_op(state_index) :
GPU_PARALLEL_SORTED_INDEX_INACTIVE_KEY;
if (key != GPU_PARALLEL_SORTED_INDEX_INACTIVE_KEY) {
const uint index = atomic_fetch_and_add_uint32(&key_prefix_sum[key], 1);
indices[index] = state_index;
}
}
CCL_NAMESPACE_END
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