96 lines
3.2 KiB
C++
96 lines
3.2 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/tensor.hpp>
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#include <cute/tensor_predicate.hpp>
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namespace cute
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{
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//
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// Accept mutable temporaries
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//
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template <class Alpha,
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class XEngine, class XLayout,
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class Beta,
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class YEngine, class YLayout,
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class PrdTensor = TrivialPredTensor>
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CUTE_HOST_DEVICE
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void
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axpby(Alpha const& alpha,
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Tensor<XEngine, XLayout> const& x,
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Beta const& beta,
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Tensor<YEngine, YLayout> && y,
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PrdTensor const& p = {})
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{
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return axpby(alpha, x, beta, y, p);
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}
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//
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// AXPBY
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//
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template <class Alpha,
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class XEngine, class XLayout,
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class Beta,
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class YEngine, class YLayout,
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class PrdTensor = TrivialPredTensor>
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CUTE_HOST_DEVICE
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void
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axpby(Alpha const& alpha,
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Tensor<XEngine, XLayout> const& x,
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Beta const& beta,
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Tensor<YEngine, YLayout> & y,
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PrdTensor const& p = {})
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{
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auto isBetaZero = [&] () {
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if constexpr (is_complex<Beta>::value) {
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return beta.real() == Int<0>{} && beta.imag() == Int<0>{};
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}
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else {
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return beta == Int<0>{};
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}
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CUTE_GCC_UNREACHABLE;
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} ();
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CUTE_UNROLL
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for (int i = 0; i < size(x); ++i) {
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if (p(i)) {
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y(i) = (isBetaZero ? alpha * x(i) : alpha * x(i) + beta * y(i));
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}
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}
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}
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} // end namespace cute
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