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