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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/arch/util.hpp>
#include <cute/numeric/numeric_types.hpp>
namespace cute
{
//
// Direct Copy for any type
//
template <class S, class D = S>
struct UniversalCopy
{
using SRegisters = S[1];
using DRegisters = D[1];
template <class S_, class D_>
CUTE_HOST_DEVICE static constexpr void
copy(S_ const& src,
D_ & dst)
{
dst = static_cast<D>(static_cast<S>(src));
}
// Accept mutable temporaries
template <class S_, class D_>
CUTE_HOST_DEVICE static constexpr void
copy(S_ const& src,
D_ && dst)
{
UniversalCopy<S,D>::copy(src, dst);
}
};
//
// Placeholder for the copy algorithm's stronger auto-vectorizing behavior
// that assumes alignment of dynamic layouts up to MaxVecBits
//
template <int MaxVecBits = 128>
struct AutoVectorizingCopyWithAssumedAlignment
: UniversalCopy<uint_bit_t<MaxVecBits>>
{
static_assert(MaxVecBits == 8 || MaxVecBits == 16 || MaxVecBits == 32 || MaxVecBits == 64 || MaxVecBits == 128,
"Expected MaxVecBits to be 8 or 16 or 32 or 64 or 128 for alignment and performance.");
};
//
// Placeholder for the copy algorithm's default auto-vectorizing behavior
// that does not assume alignment of dynamic layouts
//
using AutoVectorizingCopy = AutoVectorizingCopyWithAssumedAlignment<8>;
// Alias
using DefaultCopy = AutoVectorizingCopy;
//
// Global memory prefetch into L2
//
CUTE_HOST_DEVICE static void
prefetch(void const* gmem_ptr)
{
#if defined(__CUDA_ARCH__)
asm volatile("prefetch.global.L2 [%0];\n" : : "l"(gmem_ptr) : "memory");
#endif
}
} // end namespace cute
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