106 lines
3.4 KiB
C++
106 lines
3.4 KiB
C++
/***************************************************************************************************
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* Copyright (c) 2023 - 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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**************************************************************************************************/
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#pragma once
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#include <cute/config.hpp>
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#include <cute/arch/util.hpp>
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#include <cute/numeric/numeric_types.hpp>
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namespace cute
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{
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//
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// Direct Copy for any type
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//
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template <class S, class D = S>
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struct UniversalCopy
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{
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using SRegisters = S[1];
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using DRegisters = D[1];
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template <class S_, class D_>
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CUTE_HOST_DEVICE static constexpr void
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copy(S_ const& src,
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D_ & dst)
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{
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dst = static_cast<D>(static_cast<S>(src));
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}
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// Accept mutable temporaries
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template <class S_, class D_>
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CUTE_HOST_DEVICE static constexpr void
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copy(S_ const& src,
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D_ && dst)
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{
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UniversalCopy<S,D>::copy(src, dst);
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}
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};
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//
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// Placeholder for the copy algorithm's stronger auto-vectorizing behavior
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// that assumes alignment of dynamic layouts up to MaxVecBits
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//
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template <int MaxVecBits = 128>
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struct AutoVectorizingCopyWithAssumedAlignment
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: UniversalCopy<uint_bit_t<MaxVecBits>>
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{
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static_assert(MaxVecBits == 8 || MaxVecBits == 16 || MaxVecBits == 32 || MaxVecBits == 64 || MaxVecBits == 128,
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"Expected MaxVecBits to be 8 or 16 or 32 or 64 or 128 for alignment and performance.");
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};
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//
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// Placeholder for the copy algorithm's default auto-vectorizing behavior
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// that does not assume alignment of dynamic layouts
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//
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using AutoVectorizingCopy = AutoVectorizingCopyWithAssumedAlignment<8>;
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// Alias
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using DefaultCopy = AutoVectorizingCopy;
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//
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// Global memory prefetch into L2
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//
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CUTE_HOST_DEVICE static void
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prefetch(void const* gmem_ptr)
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{
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#if defined(__CUDA_ARCH__)
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asm volatile("prefetch.global.L2 [%0];\n" : : "l"(gmem_ptr) : "memory");
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#endif
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}
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} // end namespace cute
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