/******************************************************************************
 * Copyright (c) 2011, Duane Merrill.  All rights reserved.
 * Copyright (c) 2011-2018, 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 TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 ******************************************************************************/

/******************************************************************************
 * Common C/C++ macro utilities
 ******************************************************************************/

#pragma once

#include <cuda/__cccl_config>

#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
#  pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
#  pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
#  pragma system_header
#endif // no system header

#include <cub/detail/detect_cuda_runtime.cuh>
#include <cub/util_namespace.cuh>

#include <cuda/std/utility>

CUB_NAMESPACE_BEGIN

/**
 * \addtogroup UtilModule
 * @{
 */

#ifndef CUB_ALIGN
#  if defined(_WIN32) || defined(_WIN64)
/// Align struct
#    define CUB_ALIGN(bytes) __declspec(align(32))
#  else
/// Align struct
#    define CUB_ALIGN(bytes) __attribute__((aligned(bytes)))
#  endif
#endif

#define CUB_PREVENT_MACRO_SUBSTITUTION

template <typename T, typename U>
constexpr __host__ __device__ auto min CUB_PREVENT_MACRO_SUBSTITUTION(T&& t, U&& u)
  -> decltype(t < u ? ::cuda::std::forward<T>(t) : ::cuda::std::forward<U>(u))
{
  return t < u ? ::cuda::std::forward<T>(t) : ::cuda::std::forward<U>(u);
}

template <typename T, typename U>
constexpr __host__ __device__ auto max CUB_PREVENT_MACRO_SUBSTITUTION(T&& t, U&& u)
  -> decltype(t < u ? ::cuda::std::forward<U>(u) : ::cuda::std::forward<T>(t))
{
  return t < u ? ::cuda::std::forward<U>(u) : ::cuda::std::forward<T>(t);
}

#ifndef CUB_MAX
/// Select maximum(a, b)
#  define CUB_MAX(a, b) (((b) > (a)) ? (b) : (a))
#endif

#ifndef CUB_MIN
/// Select minimum(a, b)
#  define CUB_MIN(a, b) (((b) < (a)) ? (b) : (a))
#endif

#ifndef CUB_QUOTIENT_FLOOR
/// Quotient of x/y rounded down to nearest integer
#  define CUB_QUOTIENT_FLOOR(x, y) ((x) / (y))
#endif

#ifndef CUB_QUOTIENT_CEILING
/// Quotient of x/y rounded up to nearest integer
#  define CUB_QUOTIENT_CEILING(x, y) (((x) + (y) -1) / (y))
#endif

#ifndef CUB_ROUND_UP_NEAREST
/// x rounded up to the nearest multiple of y
#  define CUB_ROUND_UP_NEAREST(x, y) ((((x) + (y) -1) / (y)) * y)
#endif

#ifndef CUB_ROUND_DOWN_NEAREST
/// x rounded down to the nearest multiple of y
#  define CUB_ROUND_DOWN_NEAREST(x, y) (((x) / (y)) * y)
#endif

#ifndef CUB_STATIC_ASSERT
#  ifndef DOXYGEN_SHOULD_SKIP_THIS // Do not document
#    define CUB_CAT_(a, b) a##b
#    define CUB_CAT(a, b)  CUB_CAT_(a, b)
#  endif // DOXYGEN_SHOULD_SKIP_THIS

/// Static assert
#  define CUB_STATIC_ASSERT(cond, msg) typedef int CUB_CAT(cub_static_assert, __LINE__)[(cond) ? 1 : -1]
#endif

#ifndef CUB_DETAIL_KERNEL_ATTRIBUTES
#  define CUB_DETAIL_KERNEL_ATTRIBUTES CCCL_DETAIL_KERNEL_ATTRIBUTES
#endif

/**
 * @def CUB_DISABLE_KERNEL_VISIBILITY_WARNING_SUPPRESSION
 * If defined, the default suppression of kernel visibility attribute warning is disabled.
 */
#if !defined(CUB_DISABLE_KERNEL_VISIBILITY_WARNING_SUPPRESSION)
_CCCL_DIAG_SUPPRESS_GCC("-Wattributes")
_CCCL_DIAG_SUPPRESS_CLANG("-Wattributes")
#  if !defined(_CCCL_CUDA_COMPILER_NVHPC)
_CCCL_DIAG_SUPPRESS_NVHPC(attribute_requires_external_linkage)
#  endif // !_CCCL_CUDA_COMPILER_NVHPC
#  if defined(_CCCL_COMPILER_ICC) || defined(_CCCL_COMPILER_ICC_LLVM)
#    pragma nv_diag_suppress 1407 // the "__visibility__" attribute can only appear on functions and
                                  // variables with external linkage'
#    pragma warning(disable : 1890) // the "__visibility__" attribute can only appear on functions and
                                    // variables with external linkage'
#  endif // _CCCL_COMPILER_ICC || _CCCL_COMPILER_ICC_LLVM
#endif // !CUB_DISABLE_KERNEL_VISIBILITY_WARNING_SUPPRESSION

/** @} */       // end group UtilModule

CUB_NAMESPACE_END
