67 lines
1.9 KiB
Plaintext
67 lines
1.9 KiB
Plaintext
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// SPDX-FileCopyrightText: Copyright (c) 2011-2025, NVIDIA CORPORATION. All rights reserved.
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// SPDX-License-Identifier: BSD-3-Clause
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#include <c2h/generators.h>
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// #include <c2h/detail/generators.cuh>
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#include <thrust/device_ptr.h>
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#include <thrust/find.h>
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#include <thrust/scan.h>
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#include <cuda/std/cstdint>
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#include <cuda/std/span>
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#include <c2h/device_policy.h>
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namespace c2h::detail
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{
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template <class T>
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struct greater_equal_op
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{
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T val;
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__device__ bool operator()(T x)
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{
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return x >= val;
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}
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};
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template <typename T>
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std::size_t gen_uniform_offsets(
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seed_t seed, cuda::std::span<T> segment_offsets, T total_elements, T min_segment_size, T max_segment_size)
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{
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gen_values_between(seed, segment_offsets, min_segment_size, max_segment_size);
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*thrust::device_ptr<T>(&segment_offsets[total_elements]) = total_elements + 1;
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thrust::exclusive_scan(device_policy, segment_offsets.begin(), segment_offsets.end(), segment_offsets.begin());
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const auto iter =
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thrust::find_if(device_policy, segment_offsets.begin(), segment_offsets.end(), greater_equal_op<T>{total_elements});
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*thrust::device_ptr<T>(&*iter) = total_elements;
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return iter - segment_offsets.begin() + 1;
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}
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template std::size_t gen_uniform_offsets(
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seed_t seed,
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cuda::std::span<int32_t> segment_offsets,
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int32_t total_elements,
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int32_t min_segment_size,
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int32_t max_segment_size);
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template std::size_t gen_uniform_offsets(
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seed_t seed,
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cuda::std::span<uint32_t> segment_offsets,
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uint32_t total_elements,
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uint32_t min_segment_size,
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uint32_t max_segment_size);
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template std::size_t gen_uniform_offsets(
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seed_t seed,
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cuda::std::span<int64_t> segment_offsets,
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int64_t total_elements,
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int64_t min_segment_size,
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int64_t max_segment_size);
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template std::size_t gen_uniform_offsets(
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seed_t seed,
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cuda::std::span<uint64_t> segment_offsets,
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uint64_t total_elements,
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uint64_t min_segment_size,
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uint64_t max_segment_size);
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} // namespace c2h::detail
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