padding.hpp

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/*
 * SPDX-FileCopyrightText: Copyright (c) 2023-2025, NVIDIA CORPORATION.
 * SPDX-License-Identifier: Apache-2.0
 */
#pragma once
#include <cuml/fil/detail/raft_proto/gpu_support.hpp>
 
namespace raft_proto {
 
/* Return the value that must be added to val to equal the next multiple of
 * alignment greater than or equal to val */
template <typename T, typename U>
HOST DEVICE auto padding_size(T val, U alignment)
{
  auto result = val;
  if (alignment != 0) {
    auto remainder = val % alignment;
    result         = alignment - remainder;
    result *= (remainder != 0);
  }
  return result;
}
 
/* Return the next multiple of alignment >= val */
template <typename T, typename U>
HOST DEVICE auto padded_size(T val, U alignment)
{
  return val + padding_size(val, alignment);
}
 
/* Return the value that must be added to val to equal the next multiple of
 * alignment less than or equal to val */
template <typename T, typename U>
HOST DEVICE auto downpadding_size(T val, U alignment)
{
  auto result = val;
  if (alignment != 0) { result = val % alignment; }
  return result;
}
 
/* Return the next multiple of alignment <= val */
template <typename T, typename U>
HOST DEVICE auto downpadded_size(T val, U alignment)
{
  return val - downpadding_size(val, alignment);
}
 
}  // namespace raft_proto