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/***************************************************************************************************
* Copyright (c) 2017 - 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.
*
**************************************************************************************************/
/*! \file
\brief AlignedBuffer is a container for trivially copyable elements suitable for use in
unions and shared memory.
*/
#pragma once
#include "cutlass/cutlass.h"
#include "cutlass/array.h"
namespace cutlass {
/////////////////////////////////////////////////////////////////////////////////////////////////
/// Modifies semantics of cutlass::Array<> to provide guaranteed alignment.
template <
typename T,
int N,
int Align = 16
>
struct AlignedBuffer {
/// Internal storage type
using Storage = uint8_t;
/// Number of logical elements held in buffer
static int const kCount = N;
/// Alignment requirement in bytes
static int const kAlign = Align;
/// Number of storage elements
static int const kBytes =
(sizeof_bits<T>::value * N + 7) / 8;
private:
/// Internal storage
alignas(Align) Storage storage[kBytes];
public:
//
// C++ standard members
//
typedef T value_type;
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef value_type *pointer;
typedef value_type const * const_pointer;
using Array = Array<T, N>;
using reference = typename Array::reference;
using const_reference = typename Array::const_reference;
public:
CUTLASS_HOST_DEVICE
pointer data() {
return reinterpret_cast<pointer>(storage);
}
CUTLASS_HOST_DEVICE
const_pointer data() const {
return reinterpret_cast<pointer>(storage);
}
CUTLASS_HOST_DEVICE
Storage * raw_data() {
return storage;
}
CUTLASS_HOST_DEVICE
Storage const * raw_data() const {
return storage;
}
CUTLASS_HOST_DEVICE
constexpr bool empty() const {
return !kCount;
}
CUTLASS_HOST_DEVICE
constexpr size_type size() const {
return kCount;
}
CUTLASS_HOST_DEVICE
constexpr size_type max_size() const {
return kCount;
}
};
/////////////////////////////////////////////////////////////////////////////////////////////////
} // namespace cutlass
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