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599 lines
21 KiB
C++
599 lines
21 KiB
C++
/* reducer_opor.h -*- C++ -*-
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*
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* @copyright
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* Copyright (C) 2009-2013, Intel Corporation
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* All rights reserved.
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*
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* @copyright
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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
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* @copyright
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/** @file reducer_opor.h
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*
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* @brief Defines classes for doing parallel bitwise or reductions.
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*
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* @ingroup ReducersOr
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*
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* @see ReducersOr
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*/
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#ifndef REDUCER_OPOR_H_INCLUDED
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#define REDUCER_OPOR_H_INCLUDED
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#include <cilk/reducer.h>
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/** @defgroup ReducersOr Bitwise Or Reducers
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*
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* Bitwise and reducers allow the computation of the bitwise and of a set of
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* values in parallel.
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*
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* @ingroup Reducers
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*
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* You should be familiar with @ref pagereducers "Cilk reducers", described in
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* file `reducers.md`, and particularly with @ref reducers_using, before trying
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* to use the information in this file.
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*
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* @section redopor_usage Usage Example
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*
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* cilk::reducer< cilk::op_or<unsigned> > r;
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* cilk_for (int i = 0; i != N; ++i) {
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* *r |= a[i];
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* }
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* unsigned result;
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* r.move_out(result);
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*
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* @section redopor_monoid The Monoid
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*
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* @subsection redopor_monoid_values Value Set
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*
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* The value set of a bitwise or reducer is the set of values of `Type`, which
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* is expected to be a builtin integer type which has a representation as a
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* sequence of bits (or something like it, such as `bool` or `std::bitset`).
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*
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* @subsection redopor_monoid_operator Operator
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*
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* The operator of a bitwise or reducer is the bitwise or operator, defined by
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* the “`|`” binary operator on `Type`.
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*
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* @subsection redopor_monoid_identity Identity
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*
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* The identity value of the reducer is the value whose representation
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* contains all 0-bits. This is expected to be the value of the default
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* constructor `Type()`.
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*
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* @section redopor_operations Operations
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*
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* @subsection redopor_constructors Constructors
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*
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* reducer() // identity
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* reducer(const Type& value)
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* reducer(move_in(Type& variable))
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*
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* @subsection redopor_get_set Set and Get
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*
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* r.set_value(const Type& value)
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* const Type& = r.get_value() const
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* r.move_in(Type& variable)
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* r.move_out(Type& variable)
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*
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* @subsection redopor_initial Initial Values
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*
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* If a bitwise or reducer is constructed without an explicit initial value,
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* then its initial value will be its identity value, as long as `Type`
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* satisfies the requirements of @ref redopor_types.
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*
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* @subsection redopor_view_ops View Operations
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*
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* *r |= a
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* *r = *r | a
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* *r = *r | a1 | a2 … | an
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*
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* @section redopor_types Type and Operator Requirements
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*
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* `Type` must be `Copy Constructible`, `Default Constructible`, and
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* `Assignable`.
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*
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* The operator “`|=`” must be defined on `Type`, with `x |= a` having the
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* same meaning as `x = x | a`.
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*
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* The expression `Type()` must be a valid expression which yields the
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* identity value (the value of `Type` whose representation consists of all
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* 0-bits).
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*
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* @section redopor_in_c Bitwise Or Reducers in C
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*
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* The @ref CILK_C_REDUCER_OPOR and @ref CILK_C_REDUCER_OPOR_TYPE macros can
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* be used to do bitwise or reductions in C. For example:
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*
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* CILK_C_REDUCER_OPOR(r, uint, 0);
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* CILK_C_REGISTER_REDUCER(r);
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* cilk_for(int i = 0; i != n; ++i) {
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* REDUCER_VIEW(r) |= a[i];
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* }
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* CILK_C_UNREGISTER_REDUCER(r);
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* printf("The bitwise OR of the elements of a is %x\n", REDUCER_VIEW(r));
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*
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* See @ref reducers_c_predefined.
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*/
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#ifdef __cplusplus
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namespace cilk {
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/** The bitwise or reducer view class.
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*
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* This is the view class for reducers created with
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* `cilk::reducer< cilk::op_or<Type> >`. It holds the accumulator variable for
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* the reduction, and allows only `or` operations to be performed on it.
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*
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* @note The reducer “dereference” operation (`reducer::operator *()`)
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* yields a reference to the view. Thus, for example, the view class’s
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* `|=` operation would be used in an expression like `*r |= a`, where
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* `r` is an opmod reducer variable.
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*
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* @tparam Type The type of the contained accumulator variable. This will
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* be the value type of a monoid_with_view that is
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* instantiated with this view.
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*
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* @see ReducersOr
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* @see op_or
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*
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* @ingroup ReducersOr
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*/
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template <typename Type>
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class op_or_view : public scalar_view<Type>
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{
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typedef scalar_view<Type> base;
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public:
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/** Class to represent the right-hand side of `*reducer = *reducer | value`.
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*
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* The only assignment operator for the op_or_view class takes an
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* rhs_proxy as its operand. This results in the syntactic restriction
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* that the only expressions that can be assigned to an op_or_view are
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* ones which generate an rhs_proxy — that is, expressions of the form
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* `op_or_view | value ... | value`.
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*
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* @warning
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* The lhs and rhs views in such an assignment must be the same;
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* otherwise, the behavior will be undefined. (I.e., `v1 = v1 | x` is
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* legal; `v1 = v2 | x` is illegal.) This condition will be checked with
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* a runtime assertion when compiled in debug mode.
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*
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* @see op_or_view
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*/
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class rhs_proxy {
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friend class op_or_view;
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const op_or_view* m_view;
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Type m_value;
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// Constructor is invoked only from op_or_view::operator|().
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//
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rhs_proxy(const op_or_view* view, const Type& value) : m_view(view), m_value(value) {}
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rhs_proxy& operator=(const rhs_proxy&); // Disable assignment operator
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rhs_proxy(); // Disable default constructor
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public:
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/** Bitwise or with an additional rhs value. If `v` is an op_or_view
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* and `a1` is a value, then the expression `v | a1` invokes the
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* view’s `operator|()` to create an rhs_proxy for `(v, a1)`; then
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* `v | a1 | a2` invokes the rhs_proxy’s `operator|()` to create a new
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* rhs_proxy for `(v, a1|a2)`. This allows the right-hand side of an
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* assignment to be not just `view | value`, but
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( `view | value | value ... | value`. The effect is that
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*
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* v = v | a1 | a2 ... | an;
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*
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* is evaluated as
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*
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* v = v | (a1 | a2 ... | an);
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*/
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rhs_proxy& operator|(const Type& x) { m_value |= x; return *this; }
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};
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/** Default/identity constructor. This constructor initializes the
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* contained value to `Type()`.
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*/
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op_or_view() : base() {}
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/** Construct with a specified initial value.
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*/
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explicit op_or_view(const Type& v) : base(v) {}
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/** Reduction operation.
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*
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* This function is invoked by the @ref op_or monoid to combine the views
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* of two strands when the right strand merges with the left one. It
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* “ors” the value contained in the left-strand view by the value
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* contained in the right-strand view, and leaves the value in the
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* right-strand view undefined.
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*
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* @param right A pointer to the right-strand view. (`this` points to
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* the left-strand view.)
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*
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* @note Used only by the @ref op_or monoid to implement the monoid
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* reduce operation.
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*/
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void reduce(op_or_view* right) { this->m_value |= right->m_value; }
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/** @name Accumulator variable updates.
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*
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* These functions support the various syntaxes for “oring” the
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* accumulator variable contained in the view with some value.
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*/
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//@{
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/** Or the accumulator variable with @a x.
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*/
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op_or_view& operator|=(const Type& x) { this->m_value |= x; return *this; }
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/** Create an object representing `*this | x`.
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*
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* @see rhs_proxy
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*/
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rhs_proxy operator|(const Type& x) const { return rhs_proxy(this, x); }
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/** Assign the result of a `view | value` expression to the view. Note that
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* this is the only assignment operator for this class.
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*
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* @see rhs_proxy
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*/
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op_or_view& operator=(const rhs_proxy& rhs) {
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__CILKRTS_ASSERT(this == rhs.m_view);
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this->m_value |= rhs.m_value;
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return *this;
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}
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//@}
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};
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/** Monoid class for bitwise or reductions. Instantiate the cilk::reducer
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* template class with an op_or monoid to create a bitwise or reducer
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* class. For example, to compute the bitwise or of a set of `unsigned long`
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* values:
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*
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* cilk::reducer< cilk::op_or<unsigned long> > r;
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*
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* @tparam Type The reducer value type.
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* @tparam Align If `false` (the default), reducers instantiated on this
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* monoid will be naturally aligned (the Cilk library 1.0
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* behavior). If `true`, reducers instantiated on this monoid
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* will be cache-aligned for binary compatibility with
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* reducers in Cilk library version 0.9.
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*
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* @see ReducersOr
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* @see op_or_view
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*
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* @ingroup ReducersOr
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*/
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template <typename Type, bool Align = false>
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struct op_or : public monoid_with_view<op_or_view<Type>, Align> {};
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/** Deprecated bitwise or reducer class.
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*
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* reducer_opor is the same as @ref reducer<@ref op_or>, except that
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* reducer_opor is a proxy for the contained view, so that accumulator
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* variable update operations can be applied directly to the reducer. For
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* example, a value is ored with a `reducer<%op_or>` with `*r |= a`, but a
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* value can be ored with a `%reducer_opor` with `r |= a`.
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*
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* @deprecated Users are strongly encouraged to use `reducer<monoid>`
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* reducers rather than the old wrappers like reducer_opor.
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* The `reducer<monoid>` reducers show the reducer/monoid/view
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* architecture more clearly, are more consistent in their
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* implementation, and present a simpler model for new
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* user-implemented reducers.
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*
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* @note Implicit conversions are provided between `%reducer_opor`
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* and `reducer<%op_or>`. This allows incremental code
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* conversion: old code that used `%reducer_opor` can pass a
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* `%reducer_opor` to a converted function that now expects a
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* pointer or reference to a `reducer<%op_or>`, and vice
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* versa.
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*
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* @tparam Type The value type of the reducer.
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*
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* @see op_or
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* @see reducer
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* @see ReducersOr
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*
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* @ingroup ReducersOr
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*/
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template <typename Type>
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class reducer_opor : public reducer< op_or<Type, true> >
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{
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typedef reducer< op_or<Type, true> > base;
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using base::view;
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public:
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/// The view type for the reducer.
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typedef typename base::view_type view_type;
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/// The view’s rhs proxy type.
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typedef typename view_type::rhs_proxy rhs_proxy;
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/// The view type for the reducer.
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typedef view_type View;
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/// The monoid type for the reducer.
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typedef typename base::monoid_type Monoid;
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/** @name Constructors
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*/
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//@{
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/** Default (identity) constructor.
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*
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* Constructs the wrapper with the default initial value of `Type()`.
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*/
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reducer_opor() {}
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/** Value constructor.
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*
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* Constructs the wrapper with a specified initial value.
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*/
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explicit reducer_opor(const Type& initial_value) : base(initial_value) {}
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//@}
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/** @name Forwarded functions
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* @details Functions that update the contained accumulator variable are
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* simply forwarded to the contained @ref op_and_view. */
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//@{
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/// @copydoc op_or_view::operator|=(const Type&)
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reducer_opor& operator|=(const Type& x)
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{
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view() |= x; return *this;
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}
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// The legacy definition of reducer_opor::operator|() has different
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// behavior and a different return type than this definition. The legacy
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// version is defined as a member function, so this new version is defined
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// as a free function to give it a different signature, so that they won’t
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// end up sharing a single object file entry.
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/// @copydoc op_or_view::operator|(const Type&) const
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friend rhs_proxy operator|(const reducer_opor& r, const Type& x)
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{
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return r.view() | x;
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}
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/// @copydoc op_and_view::operator=(const rhs_proxy&)
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reducer_opor& operator=(const rhs_proxy& temp)
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{
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view() = temp; return *this;
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}
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//@}
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/** @name Dereference
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* @details Dereferencing a wrapper is a no-op. It simply returns the
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* wrapper. Combined with the rule that the wrapper forwards view
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* operations to its contained view, this means that view operations can
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* be written the same way on reducers and wrappers, which is convenient
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* for incrementally converting old code using wrappers to use reducers
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* instead. That is:
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*
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* reducer< op_and<int> > r;
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* *r &= a; // *r returns the view
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* // operator &= is a view member function
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*
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* reducer_opand<int> w;
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* *w &= a; // *w returns the wrapper
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* // operator &= is a wrapper member function that
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* // calls the corresponding view function
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*/
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//@{
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reducer_opor& operator*() { return *this; }
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reducer_opor const& operator*() const { return *this; }
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reducer_opor* operator->() { return this; }
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reducer_opor const* operator->() const { return this; }
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//@}
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/** @name Upcast
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* @details In Cilk library 0.9, reducers were always cache-aligned. In
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* library 1.0, reducer cache alignment is optional. By default, reducers
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* are unaligned (i.e., just naturally aligned), but legacy wrappers
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* inherit from cache-aligned reducers for binary compatibility.
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*
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* This means that a wrapper will automatically be upcast to its aligned
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* reducer base class. The following conversion operators provide
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* pseudo-upcasts to the corresponding unaligned reducer class.
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*/
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//@{
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operator reducer< op_or<Type, false> >& ()
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{
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return *reinterpret_cast< reducer< op_or<Type, false> >* >(this);
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}
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operator const reducer< op_or<Type, false> >& () const
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{
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return *reinterpret_cast< const reducer< op_or<Type, false> >* >(this);
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}
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//@}
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};
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/// @cond internal
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/** Metafunction specialization for reducer conversion.
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*
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* This specialization of the @ref legacy_reducer_downcast template class
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* defined in reducer.h causes the `reducer< op_or<Type> >` class to have an
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* `operator reducer_opor<Type>& ()` conversion operator that statically
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* downcasts the `reducer<op_or>` to the corresponding `reducer_opor` type.
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* (The reverse conversion, from `reducer_opor` to `reducer<op_or>`, is just
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* an upcast, which is provided for free by the language.)
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*
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* @ingroup ReducersOr
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*/
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template <typename Type, bool Align>
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struct legacy_reducer_downcast<reducer<op_or<Type, Align> > >
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{
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typedef reducer_opor<Type> type;
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};
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/// @endcond
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} // namespace cilk
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#endif /* __cplusplus */
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/** @ingroup ReducersOr
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*/
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//@{
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/** @name C language reducer macros
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*
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* These macros are used to declare and work with op_or reducers in C code.
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*
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* @see @ref page_reducers_in_c
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*/
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//@{
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__CILKRTS_BEGIN_EXTERN_C
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/** Opor reducer type name.
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*
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* This macro expands into the identifier which is the name of the op_or
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* reducer type for a specified numeric type.
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*
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* @param tn The @ref reducers_c_type_names "numeric type name" specifying
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* the type of the reducer.
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*
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* @see @ref reducers_c_predefined
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* @see ReducersOr
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*/
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#define CILK_C_REDUCER_OPOR_TYPE(tn) \
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__CILKRTS_MKIDENT(cilk_c_reducer_opor_,tn)
|
||
|
||
/** Declare an op_or reducer object.
|
||
*
|
||
* This macro expands into a declaration of an op_or reducer object for a
|
||
* specified numeric type. For example:
|
||
*
|
||
* CILK_C_REDUCER_OPOR(my_reducer, ulong, 0);
|
||
*
|
||
* @param obj The variable name to be used for the declared reducer object.
|
||
* @param tn The @ref reducers_c_type_names "numeric type name" specifying
|
||
* the type of the reducer.
|
||
* @param v The initial value for the reducer. (A value which can be
|
||
* assigned to the numeric type represented by @a tn.)
|
||
*
|
||
* @see @ref reducers_c_predefined
|
||
* @see ReducersOr
|
||
*/
|
||
#define CILK_C_REDUCER_OPOR(obj,tn,v) \
|
||
CILK_C_REDUCER_OPOR_TYPE(tn) obj = \
|
||
CILK_C_INIT_REDUCER(_Typeof(obj.value), \
|
||
__CILKRTS_MKIDENT(cilk_c_reducer_opor_reduce_,tn), \
|
||
__CILKRTS_MKIDENT(cilk_c_reducer_opor_identity_,tn), \
|
||
__cilkrts_hyperobject_noop_destroy, v)
|
||
|
||
/// @cond internal
|
||
|
||
/** Declare the op_or reducer functions for a numeric type.
|
||
*
|
||
* This macro expands into external function declarations for functions which
|
||
* implement the reducer functionality for the op_or reducer type for a
|
||
* specified numeric type.
|
||
*
|
||
* @param t The value type of the reducer.
|
||
* @param tn The value “type name” identifier, used to construct the reducer
|
||
* type name, function names, etc.
|
||
*/
|
||
#define CILK_C_REDUCER_OPOR_DECLARATION(t,tn) \
|
||
typedef CILK_C_DECLARE_REDUCER(t) CILK_C_REDUCER_OPOR_TYPE(tn); \
|
||
__CILKRTS_DECLARE_REDUCER_REDUCE(cilk_c_reducer_opor,tn,l,r); \
|
||
__CILKRTS_DECLARE_REDUCER_IDENTITY(cilk_c_reducer_opor,tn);
|
||
|
||
/** Define the op_or reducer functions for a numeric type.
|
||
*
|
||
* This macro expands into function definitions for functions which implement
|
||
* the reducer functionality for the op_or reducer type for a specified
|
||
* numeric type.
|
||
*
|
||
* @param t The value type of the reducer.
|
||
* @param tn The value “type name” identifier, used to construct the reducer
|
||
* type name, function names, etc.
|
||
*/
|
||
#define CILK_C_REDUCER_OPOR_DEFINITION(t,tn) \
|
||
typedef CILK_C_DECLARE_REDUCER(t) CILK_C_REDUCER_OPOR_TYPE(tn); \
|
||
__CILKRTS_DECLARE_REDUCER_REDUCE(cilk_c_reducer_opor,tn,l,r) \
|
||
{ *(t*)l |= *(t*)r; } \
|
||
__CILKRTS_DECLARE_REDUCER_IDENTITY(cilk_c_reducer_opor,tn) \
|
||
{ *(t*)v = 0; }
|
||
|
||
//@{
|
||
/** @def CILK_C_REDUCER_OPOR_INSTANCE
|
||
* @brief Declare or define implementation functions for a reducer type.
|
||
*
|
||
* In the runtime source file c_reducers.c, the macro `CILK_C_DEFINE_REDUCERS`
|
||
* will be defined, and this macro will generate reducer implementation
|
||
* functions. Everywhere else, `CILK_C_DEFINE_REDUCERS` will be undefined, and
|
||
* this macro will expand into external declarations for the functions.
|
||
*/
|
||
#ifdef CILK_C_DEFINE_REDUCERS
|
||
# define CILK_C_REDUCER_OPOR_INSTANCE(t,tn) \
|
||
CILK_C_REDUCER_OPOR_DEFINITION(t,tn)
|
||
#else
|
||
# define CILK_C_REDUCER_OPOR_INSTANCE(t,tn) \
|
||
CILK_C_REDUCER_OPOR_DECLARATION(t,tn)
|
||
#endif
|
||
//@}
|
||
|
||
/* Declare or define an instance of the reducer type and its functions for each
|
||
* numeric type.
|
||
*/
|
||
CILK_C_REDUCER_OPOR_INSTANCE(char, char)
|
||
CILK_C_REDUCER_OPOR_INSTANCE(unsigned char, uchar)
|
||
CILK_C_REDUCER_OPOR_INSTANCE(signed char, schar)
|
||
CILK_C_REDUCER_OPOR_INSTANCE(wchar_t, wchar_t)
|
||
CILK_C_REDUCER_OPOR_INSTANCE(short, short)
|
||
CILK_C_REDUCER_OPOR_INSTANCE(unsigned short, ushort)
|
||
CILK_C_REDUCER_OPOR_INSTANCE(int, int)
|
||
CILK_C_REDUCER_OPOR_INSTANCE(unsigned int, uint)
|
||
CILK_C_REDUCER_OPOR_INSTANCE(unsigned int, unsigned) /* alternate name */
|
||
CILK_C_REDUCER_OPOR_INSTANCE(long, long)
|
||
CILK_C_REDUCER_OPOR_INSTANCE(unsigned long, ulong)
|
||
CILK_C_REDUCER_OPOR_INSTANCE(long long, longlong)
|
||
CILK_C_REDUCER_OPOR_INSTANCE(unsigned long long, ulonglong)
|
||
|
||
//@endcond
|
||
|
||
__CILKRTS_END_EXTERN_C
|
||
|
||
//@}
|
||
|
||
//@}
|
||
|
||
#endif /* REDUCER_OPOR_H_INCLUDED */
|