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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 Statically sized array of elements that accommodates all CUTLASS-supported numeric types
and is safe to use in a union.
*/
#pragma once
#include "cutlass/arch/wmma.h"
#if defined(CUTLASS_ARCH_WMMA_ENABLED)
#include "cutlass/cutlass.h"
#include "cutlass/array.h"
#include "cutlass/functional.h"
namespace cutlass {
////////////////////////////////////////////////////////////////////////////////////////////////////
/// Wmma array type (WmmaFragmentArray holds elements of type nvcuda::wmma::fragment)
template <
/// Element type
typename T,
/// Number of elements in the array
int N,
/// Whether the element type of T is half_t or __half
bool IsHalfType = (platform::is_same<typename T::element_type, cutlass::half_t>::value ||
platform::is_same<typename T::element_type, __half>::value)
>
class WmmaFragmentArray: public Array<T, N, true> {
public:
/// Efficient clear method (override Array::clear())
CUTLASS_HOST_DEVICE
void clear()
{
for(int i = 0; i < Array<T, N, true>::kElements; i++)
{
nvcuda::wmma::fill_fragment((*this)[i], (typename T::element_type)0);
}
}
CUTLASS_HOST_DEVICE
WmmaFragmentArray<T, N>& operator+=(const WmmaFragmentArray<T, N>& rhs)
{
using element_type = typename T::element_type;
plus<T> add;
for (int i = 0; i < Array<T, N, true>::kElements; i++)
{
(*this)[i] = add((*this)[i], rhs[i]);
}
return *this;
}
};
/// Partial specialization for the case in which T::element_type is
/// half_t or __half. This is needed because the cast (typename T::element_type)0
/// in the primary template flags as an error when __CUDA_NO_HALF_CONVERSIONS__
/// is set.
template <
/// Element type
typename T,
/// Number of elements in the array
int N
>
class WmmaFragmentArray<T, N, true>: public Array<T, N, true> {
public:
/// Efficient clear method (override Array::clear())
CUTLASS_HOST_DEVICE
void clear()
{
for(int i = 0; i < Array<T, N, true>::kElements; i++)
{
nvcuda::wmma::fill_fragment((*this)[i], __float2half(0.f));
}
}
CUTLASS_HOST_DEVICE
WmmaFragmentArray<T, N>& operator+=(const WmmaFragmentArray<T, N>& rhs)
{
using element_type = typename T::element_type;
plus<T> add;
for (int i = 0; i < Array<T, N, true>::kElements; i++)
{
(*this)[i] = add((*this)[i], rhs[i]);
}
return *this;
}
};
////////////////////////////////////////////////////////////////////////////////////////////////////
} // namespace cutlass
///////////////////////////////////////////////////////////////////////////////////////////////////
#endif // if defined(CUTLASS_ARCH_WMMA_ENABLED)
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