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/***************************************************************************************************
* Copyright (c) 2023 - 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: BSD-3-Clause
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder 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 THE COPYRIGHT HOLDER OR CONTRIBUTORS 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.
*
**************************************************************************************************/
#pragma once
#include <cute/config.hpp>
#include <cute/numeric/numeric_types.hpp>
#include <cute/numeric/math.hpp>
namespace cute
{
// Test if a pointer is aligned to N bytes
template <int N>
CUTE_HOST_DEVICE constexpr
bool
is_byte_aligned(void const* const ptr)
{
static_assert(N > 0 && (N & (N - 1)) == 0, "N must be a power of 2 in alignment check");
return (reinterpret_cast<uintptr_t>(ptr) & (N-1)) == 0;
}
#if defined(__CUDACC__)
# define CUTE_ALIGNAS(n) __align__(n)
#else
# define CUTE_ALIGNAS(n) alignas(n)
#endif
template <size_t Alignment>
struct aligned_struct {};
template <> struct CUTE_ALIGNAS( 1) aligned_struct< 1> {};
template <> struct CUTE_ALIGNAS( 2) aligned_struct< 2> {};
template <> struct CUTE_ALIGNAS( 4) aligned_struct< 4> {};
template <> struct CUTE_ALIGNAS( 8) aligned_struct< 8> {};
template <> struct CUTE_ALIGNAS( 16) aligned_struct< 16> {};
template <> struct CUTE_ALIGNAS( 32) aligned_struct< 32> {};
template <> struct CUTE_ALIGNAS( 64) aligned_struct< 64> {};
template <> struct CUTE_ALIGNAS(128) aligned_struct<128> {};
template <> struct CUTE_ALIGNAS(256) aligned_struct<256> {};
} // end namespace cute
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