130 lines
3.8 KiB
C++
130 lines
3.8 KiB
C++
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/***************************************************************************************************
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* Copyright (c) 2017-2019, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted
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* provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of the NVIDIA CORPORATION nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TOR (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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/*! \file
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\brief Implements the BLAS linear scaling function alpha*AB + beta*C
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*/
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#pragma once
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#include "cutlass/cutlass.h"
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namespace cutlass {
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////////////////////////////////////////////////////////////////////////////////////////////////////
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namespace detail {
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/// Helper class defines an object which operates as either a scalar or a pointer. If the pointer
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/// is non-null, it is dereferenced when the object is accessed.
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template <typename Scalar_>
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class ScalarOrPointer {
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public:
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/// Underlying scalar type
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typedef Scalar_ Scalar;
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private:
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//
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// Data members
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//
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/// Scalar value
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Scalar scalar;
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/// Pointer to use if non null
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Scalar const *ptr;
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public:
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//
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// Methods
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//
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/// Default ctor
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CUTLASS_HOST_DEVICE
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ScalarOrPointer(): scalar(0), ptr(nullptr) {}
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/// Object behaves as a scalar
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CUTLASS_HOST_DEVICE
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ScalarOrPointer(Scalar const &val): scalar(val), ptr(nullptr) {}
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/// Object behaves as a scalar
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CUTLASS_HOST_DEVICE
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ScalarOrPointer(Scalar const *ptr_): scalar(0), ptr(ptr_) {}
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/// Returns true if is pointer
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CUTLASS_HOST_DEVICE
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bool is_pointer() const {
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return bool(ptr);
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}
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/// Gets the pointer value
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CUTLASS_HOST_DEVICE
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Scalar const *get_ptr() const {
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return ptr;
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}
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/// Gets the pointer value
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CUTLASS_HOST_DEVICE
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Scalar get_scalar() const {
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return scalar;
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}
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/// Assigns to a scalar and sets pointer to nullptr
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CUTLASS_HOST_DEVICE
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ScalarOrPointer &operator=(Scalar const &scalar_) {
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scalar = scalar_;
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ptr = nullptr;
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return *this;
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}
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/// Assigns to a pointer value
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CUTLASS_HOST_DEVICE
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ScalarOrPointer &operator=(Scalar const *ptr_) {
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ptr = ptr_;
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return *this;
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}
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/// Access the element
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CUTLASS_HOST_DEVICE
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Scalar get() const {
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if (ptr) {
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return *ptr;
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}
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return scalar;
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}
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/// Accesses the element
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CUTLASS_HOST_DEVICE
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operator Scalar() const {
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return get();
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}
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};
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} // namespace detail
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////////////////////////////////////////////////////////////////////////////////////////////////////
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} // namespace cutlass
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