lammps-sys 0.6.0

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//                        Kokkos v. 2.0
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#ifndef KOKKOS_EXECPOLICY_HPP
#define KOKKOS_EXECPOLICY_HPP

#include <Kokkos_Core_fwd.hpp>
#include <impl/Kokkos_Traits.hpp>
#include <impl/Kokkos_Error.hpp>
#include <impl/Kokkos_Tags.hpp>
#include <impl/Kokkos_AnalyzePolicy.hpp>
#include <Kokkos_Concepts.hpp>
#include <iostream>
#if defined(KOKKOS_ENABLE_PROFILING)
#include <typeinfo>
#endif // KOKKOS_ENABLE_PROFILING

//----------------------------------------------------------------------------

namespace Kokkos {

struct ParallelForTag {};
struct ParallelScanTag {};
struct ParallelReduceTag {};

struct ChunkSize {
  int value;
  ChunkSize(int value_):value(value_) {}
};

/** \brief  Execution policy for work over a range of an integral type.
 *
 * Valid template argument options:
 *
 *  With a specified execution space:
 *    < ExecSpace , WorkTag , { IntConst | IntType } >
 *    < ExecSpace , WorkTag , void >
 *    < ExecSpace , { IntConst | IntType } , void >
 *    < ExecSpace , void , void >
 *
 *  With the default execution space:
 *    < WorkTag , { IntConst | IntType } , void >
 *    < WorkTag , void , void >
 *    < { IntConst | IntType } , void , void >
 *    < void , void , void >
 *
 *  IntType  is a fundamental integral type
 *  IntConst is an Impl::integral_constant< IntType , Blocking >
 *
 *  Blocking is the granularity of partitioning the range among threads.
 */
template<class ... Properties>
class RangePolicy
  : public Impl::PolicyTraits<Properties ... >
{
public:
  typedef Impl::PolicyTraits<Properties ... > traits;
private:

  typename traits::execution_space m_space ;
  typename traits::index_type  m_begin ;
  typename traits::index_type  m_end ;
  typename traits::index_type  m_granularity ;
  typename traits::index_type  m_granularity_mask ;

  template<class ... OtherProperties>
  friend class RangePolicy;

public:
  //! Tag this class as an execution policy
  typedef RangePolicy execution_policy;
  typedef typename traits::index_type member_type ;
  typedef typename traits::index_type index_type;

  KOKKOS_INLINE_FUNCTION const typename traits::execution_space & space() const { return m_space ; }
  KOKKOS_INLINE_FUNCTION member_type begin() const { return m_begin ; }
  KOKKOS_INLINE_FUNCTION member_type end()   const { return m_end ; }

  //TODO: find a better workaround for Clangs weird instantiation order
  // This thing is here because of an instantiation error, where the RangePolicy is inserted into FunctorValue Traits, which
  // tries decltype on the operator. It tries to do this even though the first argument of parallel for clearly doesn't match.
  void operator()(const int&) const {}

  RangePolicy(const RangePolicy&) = default;
  RangePolicy(RangePolicy&&) = default;

  template<class ... OtherProperties>
  RangePolicy(const RangePolicy<OtherProperties...> p) {
    m_space = p.m_space;
    m_begin = p.m_begin;
    m_end = p.m_end;
    m_granularity = p.m_granularity;
    m_granularity_mask = p.m_granularity_mask;
  }

  inline RangePolicy() : m_space(), m_begin(0), m_end(0) {}

  /** \brief  Total range */
  inline
  RangePolicy( const typename traits::execution_space & work_space
             , const member_type work_begin
             , const member_type work_end
             )
    : m_space( work_space )
    , m_begin( work_begin < work_end ? work_begin : 0 )
    , m_end(   work_begin < work_end ? work_end : 0 )
    , m_granularity(0)
    , m_granularity_mask(0)
    {
      set_auto_chunk_size();
    }

  /** \brief  Total range */
  inline
  RangePolicy( const member_type work_begin
             , const member_type work_end
             )
    : RangePolicy( typename traits::execution_space()
                 , work_begin , work_end )
    {
      set_auto_chunk_size();
    }

  /** \brief  Total range */
  template<class ... Args>
  inline
  RangePolicy( const typename traits::execution_space & work_space
             , const member_type work_begin
             , const member_type work_end
             , Args ... args
             )
    : m_space( work_space )
    , m_begin( work_begin < work_end ? work_begin : 0 )
    , m_end(   work_begin < work_end ? work_end : 0 )
    , m_granularity(0)
    , m_granularity_mask(0)
    {
      set_auto_chunk_size();
      set(args...);
    }

  /** \brief  Total range */
  template<class ... Args>
  inline
  RangePolicy( const member_type work_begin
             , const member_type work_end
             , Args ... args
             )
    : RangePolicy( typename traits::execution_space()
                 , work_begin , work_end )
    {
      set_auto_chunk_size();
      set(args...);
    }

private:
  inline void set() {}

public:
  template<class ... Args>
  inline void set(Args ...) {
    static_assert( 0 == sizeof...(Args), "Kokkos::RangePolicy: unhandled constructor arguments encountered.");
  }

  template<class ... Args>
  inline void set(const ChunkSize& chunksize, Args ... args) {
    m_granularity = chunksize.value;
    m_granularity_mask = m_granularity - 1;
  }

public:
  /** \brief return chunk_size */
  inline member_type chunk_size() const {
    return m_granularity;
  }

  /** \brief set chunk_size to a discrete value*/
  inline RangePolicy set_chunk_size(int chunk_size_) const {
    RangePolicy p = *this;
    p.m_granularity = chunk_size_;
    p.m_granularity_mask = p.m_granularity - 1;
    return p;
  }

private:
  /** \brief finalize chunk_size if it was set to AUTO*/
  inline void set_auto_chunk_size() {

   typename traits::index_type concurrency = traits::execution_space::concurrency();
   if( concurrency==0 ) concurrency=1;

   if(m_granularity > 0) {
     if(!Impl::is_integral_power_of_two( m_granularity ))
       Kokkos::abort("RangePolicy blocking granularity must be power of two" );
   }

   member_type new_chunk_size = 1;
   while(new_chunk_size*100*concurrency < m_end-m_begin)
     new_chunk_size *= 2;
   if(new_chunk_size < 128) {
     new_chunk_size = 1;
     while( (new_chunk_size*40*concurrency < m_end-m_begin ) && (new_chunk_size<128) )
       new_chunk_size*=2;
   }
   m_granularity = new_chunk_size;
   m_granularity_mask = m_granularity - 1;
  }

public:
  /** \brief  Subrange for a partition's rank and size.
   *
   *  Typically used to partition a range over a group of threads.
   */
  struct WorkRange {
    typedef typename RangePolicy::work_tag     work_tag ;
    typedef typename RangePolicy::member_type  member_type ;

    KOKKOS_INLINE_FUNCTION member_type begin() const { return m_begin ; }
    KOKKOS_INLINE_FUNCTION member_type end()   const { return m_end ; }

    /** \brief  Subrange for a partition's rank and size.
     *
     *  Typically used to partition a range over a group of threads.
     */
    KOKKOS_INLINE_FUNCTION
    WorkRange( const RangePolicy & range
             , const int part_rank
             , const int part_size
             )
      : m_begin(0), m_end(0)
      {
        if ( part_size ) {

          // Split evenly among partitions, then round up to the granularity.
          const member_type work_part =
            ( ( ( ( range.end() - range.begin() ) + ( part_size - 1 ) ) / part_size )
              + range.m_granularity_mask ) & ~member_type(range.m_granularity_mask);

          m_begin = range.begin() + work_part * part_rank ;
          m_end   = m_begin       + work_part ;

          if ( range.end() < m_begin ) m_begin = range.end() ;
          if ( range.end() < m_end )   m_end   = range.end() ;
        }
      }

  private:
    member_type m_begin ;
    member_type m_end ;
    WorkRange();
    WorkRange & operator = ( const WorkRange & );
  };
};

} // namespace Kokkos

//----------------------------------------------------------------------------
//----------------------------------------------------------------------------

namespace Kokkos {

namespace Impl {

template< class ExecSpace, class ... Properties>
class TeamPolicyInternal: public Impl::PolicyTraits<Properties ... > {
private:
  typedef Impl::PolicyTraits<Properties ... > traits;

public:
  
  typedef typename traits::index_type index_type;

  //----------------------------------------
  /** \brief  Query maximum team size for a given functor.
   *
   *  This size takes into account execution space concurrency limitations and
   *  scratch memory space limitations for reductions, team reduce/scan, and
   *  team shared memory.
   *
   *  This function only works for single-operator functors.
   *  With multi-operator functors it cannot be determined
   *  which operator will be called.
   */
  template< class FunctorType >
  static int team_size_max( const FunctorType & );

  /** \brief  Query recommended team size for a given functor.
   *
   *  This size takes into account execution space concurrency limitations and
   *  scratch memory space limitations for reductions, team reduce/scan, and
   *  team shared memory.
   *
   *  This function only works for single-operator functors.
   *  With multi-operator functors it cannot be determined
   *  which operator will be called.
   */
  template< class FunctorType >
  static int team_size_recommended( const FunctorType & );

  template< class FunctorType >
  static int team_size_recommended( const FunctorType & , const int&);

  template<class FunctorType>
  int team_size_recommended( const FunctorType & functor , const int vector_length);

  //----------------------------------------
  /** \brief  Construct policy with the given instance of the execution space */
  TeamPolicyInternal( const typename traits::execution_space & , int league_size_request , int team_size_request , int vector_length_request = 1 );

  TeamPolicyInternal( const typename traits::execution_space & , int league_size_request , const Kokkos::AUTO_t & , int vector_length_request = 1 );

  /** \brief  Construct policy with the default instance of the execution space */
  TeamPolicyInternal( int league_size_request , int team_size_request , int vector_length_request = 1 );

  TeamPolicyInternal( int league_size_request , const Kokkos::AUTO_t & , int vector_length_request = 1 );

/*  TeamPolicyInternal( int league_size_request , int team_size_request );

  TeamPolicyInternal( int league_size_request , const Kokkos::AUTO_t & );*/

  /** \brief  The actual league size (number of teams) of the policy.
   *
   *  This may be smaller than the requested league size due to limitations
   *  of the execution space.
   */
  KOKKOS_INLINE_FUNCTION int league_size() const ;

  /** \brief  The actual team size (number of threads per team) of the policy.
   *
   *  This may be smaller than the requested team size due to limitations
   *  of the execution space.
   */
  KOKKOS_INLINE_FUNCTION int team_size() const ;

  inline typename traits::index_type chunk_size() const ;

#ifdef KOKKOS_ENABLE_DEPRECATED_CODE
  inline TeamPolicyInternal set_chunk_size(int chunk_size) const ;
#else
  inline TeamPolicyInternal& set_chunk_size(int chunk_size);
#endif

  /** \brief  Parallel execution of a functor calls the functor once with
   *          each member of the execution policy.
   */
  struct member_type {

    /** \brief  Handle to the currently executing team shared scratch memory */
    KOKKOS_INLINE_FUNCTION
    typename traits::execution_space::scratch_memory_space team_shmem() const ;

    /** \brief  Rank of this team within the league of teams */
    KOKKOS_INLINE_FUNCTION int league_rank() const ;

    /** \brief  Number of teams in the league */
    KOKKOS_INLINE_FUNCTION int league_size() const ;

    /** \brief  Rank of this thread within this team */
    KOKKOS_INLINE_FUNCTION int team_rank() const ;

    /** \brief  Number of threads in this team */
    KOKKOS_INLINE_FUNCTION int team_size() const ;

    /** \brief  Barrier among the threads of this team */
    KOKKOS_INLINE_FUNCTION void team_barrier() const ;

    /** \brief  Intra-team reduction. Returns join of all values of the team members. */
    template< class JoinOp >
    KOKKOS_INLINE_FUNCTION
    typename JoinOp::value_type team_reduce( const typename JoinOp::value_type
                                           , const JoinOp & ) const ;

    /** \brief  Intra-team exclusive prefix sum with team_rank() ordering.
     *
     *  The highest rank thread can compute the reduction total as
     *    reduction_total = dev.team_scan( value ) + value ;
     */
    template< typename Type >
    KOKKOS_INLINE_FUNCTION Type team_scan( const Type & value ) const ;

    /** \brief  Intra-team exclusive prefix sum with team_rank() ordering
     *          with intra-team non-deterministic ordering accumulation.
     *
     *  The global inter-team accumulation value will, at the end of the
     *  league's parallel execution, be the scan's total.
     *  Parallel execution ordering of the league's teams is non-deterministic.
     *  As such the base value for each team's scan operation is similarly
     *  non-deterministic.
     */
    template< typename Type >
    KOKKOS_INLINE_FUNCTION Type team_scan( const Type & value , Type * const global_accum ) const ;
  };
};


  struct PerTeamValue {
    int value;
    PerTeamValue(int arg);
  };

  struct PerThreadValue {
    int value;
    PerThreadValue(int arg);
  };

  template<class iType, class ... Args>
  struct ExtractVectorLength {
    static inline iType value(typename std::enable_if<std::is_integral<iType>::value,iType>::type val, Args...) {
      return val;
    }
    static inline typename std::enable_if<!std::is_integral<iType>::value,int>::type value(typename std::enable_if<!std::is_integral<iType>::value,iType>::type, Args...) {
      return 1;
    }
  };

  template<class iType, class ... Args>
  inline typename std::enable_if<std::is_integral<iType>::value,iType>::type extract_vector_length(iType val, Args...) {
    return val;
  }

  template<class iType, class ... Args>
  inline typename std::enable_if<!std::is_integral<iType>::value,int>::type extract_vector_length(iType, Args...) {
    return 1;
  }

}

Impl::PerTeamValue PerTeam(const int& arg);
Impl::PerThreadValue PerThread(const int& arg);

struct ScratchRequest {
  int level;

  int per_team;
  int per_thread;

  inline
  ScratchRequest(const int& level_, const Impl::PerTeamValue& team_value) {
    level = level_;
    per_team = team_value.value;
    per_thread = 0;
  }

  inline
  ScratchRequest(const int& level_, const Impl::PerThreadValue& thread_value) {
    level = level_;
    per_team = 0;
    per_thread = thread_value.value;;
  }

  inline
  ScratchRequest(const int& level_, const Impl::PerTeamValue& team_value, const Impl::PerThreadValue& thread_value) {
    level = level_;
    per_team = team_value.value;
    per_thread = thread_value.value;;
  }

  inline
  ScratchRequest(const int& level_, const Impl::PerThreadValue& thread_value, const Impl::PerTeamValue& team_value) {
    level = level_;
    per_team = team_value.value;
    per_thread = thread_value.value;;
  }

};


/** \brief  Execution policy for parallel work over a league of teams of threads.
 *
 *  The work functor is called for each thread of each team such that
 *  the team's member threads are guaranteed to be concurrent.
 *
 *  The team's threads have access to team shared scratch memory and
 *  team collective operations.
 *
 *  If the WorkTag is non-void then the first calling argument of the
 *  work functor's parentheses operator is 'const WorkTag &'.
 *  This allows a functor to have multiple work member functions.
 *
 *  Order of template arguments does not matter, since the implementation
 *  uses variadic templates. Each and any of the template arguments can
 *  be omitted.
 *
 *  Possible Template arguments and their default values:
 *    ExecutionSpace (DefaultExecutionSpace): where to execute code. Must be enabled.
 *    WorkTag (none): Tag which is used as the first argument for the functor operator.
 *    Schedule<Type> (Schedule<Static>): Scheduling Policy (Dynamic, or Static).
 *    IndexType<Type> (IndexType<ExecutionSpace::size_type>: Integer Index type used to iterate over the Index space.
 *    LaunchBounds<unsigned,unsigned> Launch Bounds for CUDA compilation,
 *    default of LaunchBounds<0,0> indicates no launch bounds specified.
 */
template< class ... Properties>
class TeamPolicy: public
  Impl::TeamPolicyInternal<
     typename Impl::PolicyTraits<Properties ... >::execution_space,
     Properties ...> {
  typedef Impl::TeamPolicyInternal<
       typename Impl::PolicyTraits<Properties ... >::execution_space,
       Properties ...> internal_policy;

  template<class ... OtherProperties>
  friend class TeamPolicy;

public:
  typedef Impl::PolicyTraits<Properties ... > traits;

  typedef TeamPolicy execution_policy;

  TeamPolicy& operator = (const TeamPolicy&) = default;

  /** \brief  Construct policy with the given instance of the execution space */
  TeamPolicy( const typename traits::execution_space & space_ , int league_size_request , int team_size_request , int vector_length_request = 1 )
    : internal_policy(space_,league_size_request,team_size_request, vector_length_request) {first_arg = false;}

  TeamPolicy( const typename traits::execution_space & space_, int league_size_request , const Kokkos::AUTO_t & , int vector_length_request = 1 )
    : internal_policy(space_,league_size_request,Kokkos::AUTO(), vector_length_request) {first_arg = false;}

  /** \brief  Construct policy with the default instance of the execution space */
  TeamPolicy( int league_size_request , int team_size_request , int vector_length_request = 1 )
    : internal_policy(league_size_request,team_size_request, vector_length_request) {first_arg = false;}

  TeamPolicy( int league_size_request , const Kokkos::AUTO_t & , int vector_length_request = 1 )
    : internal_policy(league_size_request,Kokkos::AUTO(), vector_length_request) {first_arg = false;}

#ifdef KOKKOS_ENABLE_DEPRECATED_CODE
  /** \brief  Construct policy with the given instance of the execution space */
  template<class ... Args>
  TeamPolicy( const typename traits::execution_space & , int league_size_request , int team_size_request , int vector_length_request,
              Args ... args)
    : internal_policy(typename traits::execution_space(),league_size_request,team_size_request, vector_length_request) {
    first_arg = false;
    set(args...);
  }

  template<class ... Args>
  TeamPolicy( const typename traits::execution_space & , int league_size_request , const Kokkos::AUTO_t & , int vector_length_request ,
              Args ... args)
    : internal_policy(typename traits::execution_space(),league_size_request,Kokkos::AUTO(), vector_length_request) {
    first_arg = false;
    set(args...);
  }

  /** \brief  Construct policy with the default instance of the execution space */
  template<class ... Args>
  TeamPolicy( int league_size_request , int team_size_request , int vector_length_request ,
              Args ... args)
    : internal_policy(league_size_request,team_size_request, vector_length_request) {
    first_arg = false;
    set(args...);
  }

  template<class ... Args>
  TeamPolicy( int league_size_request , const Kokkos::AUTO_t & , int vector_length_request ,
              Args ... args)
    : internal_policy(league_size_request,Kokkos::AUTO(), vector_length_request) {
    first_arg = false;
    set(args...);
  }

  /** \brief  Construct policy with the given instance of the execution space */
  template<class ... Args>
  TeamPolicy( const typename traits::execution_space & , int league_size_request , int team_size_request ,
              Args ... args)
    : internal_policy(typename traits::execution_space(),league_size_request,team_size_request,
                      Kokkos::Impl::extract_vector_length<Args...>(args...)) {
    first_arg = true;
    set(args...);
  }

  template<class ... Args>
  TeamPolicy( const typename traits::execution_space & , int league_size_request , const Kokkos::AUTO_t & ,
              Args ... args)
    : internal_policy(typename traits::execution_space(),league_size_request,Kokkos::AUTO(),
                      Kokkos::Impl::extract_vector_length<Args...>(args...)) {
    first_arg = true;
    set(args...);
  }

  /** \brief  Construct policy with the default instance of the execution space */
  template<class ... Args>
  TeamPolicy( int league_size_request , int team_size_request ,
              Args ... args)
    : internal_policy(league_size_request,team_size_request,
                      Kokkos::Impl::extract_vector_length<Args...>(args...)) {
    first_arg = true;
    set(args...);
  }

  template<class ... Args>
  TeamPolicy( int league_size_request , const Kokkos::AUTO_t & ,
              Args ... args)
    : internal_policy(league_size_request,Kokkos::AUTO(),
                      Kokkos::Impl::extract_vector_length<Args...>(args...)) {
    first_arg = true;
    set(args...);
  }
#endif

  template<class ... OtherProperties>
  TeamPolicy(const TeamPolicy<OtherProperties...> p):internal_policy(p) {
    first_arg = p.first_arg;
  }

private:
  bool first_arg;
  TeamPolicy(const internal_policy& p):internal_policy(p) {first_arg = false;}

#ifdef KOKKOS_ENABLE_DEPRECATED_CODE
  inline void set() {}
#endif

public:
#ifdef KOKKOS_ENABLE_DEPRECATED_CODE
  template<class ... Args>
  inline void set(Args ...) {
    static_assert( 0 == sizeof...(Args), "Kokkos::TeamPolicy: unhandled constructor arguments encountered.");
  }

  template<class iType, class ... Args>
  inline typename std::enable_if<std::is_integral<iType>::value>::type set(iType, Args ... args) {
    if(first_arg) {
      first_arg = false;
      set(args...);
    } else {
      first_arg = false;
      Kokkos::Impl::throw_runtime_exception("Kokkos::TeamPolicy: integer argument to constructor in illegal place.");
    }
  }

  template<class ... Args>
  inline void set(const ChunkSize& chunksize, Args ... args) {
    first_arg = false;
    internal_policy::internal_set_chunk_size(chunksize.value);
    set(args...);
  }

  template<class ... Args>
  inline void set(const ScratchRequest& scr_request, Args ... args) {
    first_arg = false;
    internal_policy::internal_set_scratch_size(scr_request.level,Impl::PerTeamValue(scr_request.per_team),
        Impl::PerThreadValue(scr_request.per_thread));
    set(args...);
  }

  inline TeamPolicy set_chunk_size(int chunk) const {
    return TeamPolicy(internal_policy::set_chunk_size(chunk));
  }

  inline TeamPolicy set_scratch_size(const int& level, const Impl::PerTeamValue& per_team) const {
    return TeamPolicy(internal_policy::set_scratch_size(level,per_team));
  }
  inline TeamPolicy set_scratch_size(const int& level, const Impl::PerThreadValue& per_thread) const {
    return TeamPolicy(internal_policy::set_scratch_size(level,per_thread));
  }
  inline TeamPolicy set_scratch_size(const int& level, const Impl::PerTeamValue& per_team, const Impl::PerThreadValue& per_thread) const {
    return TeamPolicy(internal_policy::set_scratch_size(level, per_team, per_thread));
  }
  inline TeamPolicy set_scratch_size(const int& level, const Impl::PerThreadValue& per_thread, const Impl::PerTeamValue& per_team) const {
    return TeamPolicy(internal_policy::set_scratch_size(level, per_team, per_thread));
  }

#else
  inline TeamPolicy& set_chunk_size(int chunk) {
    static_assert(std::is_same<decltype(internal_policy::set_chunk_size(chunk)), internal_policy&>::value, "internal set_chunk_size should return a reference");
    return static_cast<TeamPolicy&>(internal_policy::set_chunk_size(chunk));
  }

  inline TeamPolicy& set_scratch_size(const int& level, const Impl::PerTeamValue& per_team) {
    static_assert(std::is_same<decltype(internal_policy::set_scratch_size(level,per_team)), internal_policy&>::value, "internal set_chunk_size should return a reference");
    return static_cast<TeamPolicy&>(internal_policy::set_scratch_size(level,per_team));
  }
  inline TeamPolicy& set_scratch_size(const int& level, const Impl::PerThreadValue& per_thread) {
    return static_cast<TeamPolicy&>(internal_policy::set_scratch_size(level,per_thread));
  }
  inline TeamPolicy& set_scratch_size(const int& level, const Impl::PerTeamValue& per_team, const Impl::PerThreadValue& per_thread) {
    return static_cast<TeamPolicy&>(internal_policy::set_scratch_size(level, per_team, per_thread));
  }
  inline TeamPolicy& set_scratch_size(const int& level, const Impl::PerThreadValue& per_thread, const Impl::PerTeamValue& per_team) {
    return static_cast<TeamPolicy&>(internal_policy::set_scratch_size(level, per_team, per_thread));
  }
#endif

};

namespace Impl {

template<typename iType, class TeamMemberType>
struct TeamThreadRangeBoundariesStruct {
private:

  KOKKOS_INLINE_FUNCTION static
  iType ibegin( const iType & arg_begin
              , const iType & arg_end
              , const iType & arg_rank
              , const iType & arg_size
              )
    {
      return arg_begin + ( ( arg_end - arg_begin + arg_size - 1 ) / arg_size ) * arg_rank ;
    }

  KOKKOS_INLINE_FUNCTION static
  iType iend( const iType & arg_begin
            , const iType & arg_end
            , const iType & arg_rank
            , const iType & arg_size
            )
    {
      const iType end_ = arg_begin + ( ( arg_end - arg_begin + arg_size - 1 ) / arg_size ) * ( arg_rank + 1 );
      return end_ < arg_end ? end_ : arg_end ;
    }

public:

  typedef iType index_type;
  const iType start;
  const iType end;
  enum {increment = 1};
  const TeamMemberType& thread;

  KOKKOS_INLINE_FUNCTION
  TeamThreadRangeBoundariesStruct( const TeamMemberType& arg_thread
                                 , const iType& arg_end
                                 )
    : start( ibegin( 0 , arg_end , arg_thread.team_rank() , arg_thread.team_size() ) )
    , end(   iend(   0 , arg_end , arg_thread.team_rank() , arg_thread.team_size() ) )
    , thread( arg_thread )
    {}

  KOKKOS_INLINE_FUNCTION
  TeamThreadRangeBoundariesStruct( const TeamMemberType& arg_thread
                                , const iType& arg_begin
                                , const iType& arg_end
                                )
    : start( ibegin( arg_begin , arg_end , arg_thread.team_rank() , arg_thread.team_size() ) )
    , end(   iend(   arg_begin , arg_end , arg_thread.team_rank() , arg_thread.team_size() ) )
    , thread( arg_thread )
    {}
};

template<typename iType, class TeamMemberType>
struct TeamVectorRangeBoundariesStruct {
private:

  KOKKOS_INLINE_FUNCTION static
  iType ibegin( const iType & arg_begin
              , const iType & arg_end
              , const iType & arg_rank
              , const iType & arg_size
              )
    {
      return arg_begin + ( ( arg_end - arg_begin + arg_size - 1 ) / arg_size ) * arg_rank ;
    }

  KOKKOS_INLINE_FUNCTION static
  iType iend( const iType & arg_begin
            , const iType & arg_end
            , const iType & arg_rank
            , const iType & arg_size
            )
    {
      const iType end_ = arg_begin + ( ( arg_end - arg_begin + arg_size - 1 ) / arg_size ) * ( arg_rank + 1 );
      return end_ < arg_end ? end_ : arg_end ;
    }

public:

  typedef iType index_type;
  const iType start;
  const iType end;
  enum {increment = 1};
  const TeamMemberType& thread;

  KOKKOS_INLINE_FUNCTION
  TeamVectorRangeBoundariesStruct( const TeamMemberType& arg_thread
                                 , const iType& arg_end
                                 )
    : start( ibegin( 0 , arg_end , arg_thread.team_rank() , arg_thread.team_size() ) )
    , end(   iend(   0 , arg_end , arg_thread.team_rank() , arg_thread.team_size() ) )
    , thread( arg_thread )
    {}

  KOKKOS_INLINE_FUNCTION
  TeamVectorRangeBoundariesStruct( const TeamMemberType& arg_thread
                                , const iType& arg_begin
                                , const iType& arg_end
                                )
    : start( ibegin( arg_begin , arg_end , arg_thread.team_rank() , arg_thread.team_size() ) )
    , end(   iend(   arg_begin , arg_end , arg_thread.team_rank() , arg_thread.team_size() ) )
    , thread( arg_thread )
    {}
};

template<typename iType, class TeamMemberType>
struct ThreadVectorRangeBoundariesStruct {
  typedef iType index_type;
  const index_type start;
  const index_type end;
  enum {increment = 1};

  KOKKOS_INLINE_FUNCTION
  constexpr ThreadVectorRangeBoundariesStruct ( const TeamMemberType, const index_type& count ) noexcept 
  : start( static_cast<index_type>(0) )
  , end( count ) {}

  KOKKOS_INLINE_FUNCTION
  constexpr ThreadVectorRangeBoundariesStruct ( const index_type& count ) noexcept
  : start( static_cast<index_type>(0) )
  , end( count ) {}

  KOKKOS_INLINE_FUNCTION
  constexpr ThreadVectorRangeBoundariesStruct ( const TeamMemberType, const index_type& arg_begin, const index_type& arg_end ) noexcept 
  : start( static_cast<index_type>(arg_begin) )
  , end( arg_end ) {}

  KOKKOS_INLINE_FUNCTION
  constexpr ThreadVectorRangeBoundariesStruct ( const index_type& arg_begin, const index_type& arg_end ) noexcept
  : start( static_cast<index_type>(arg_begin) )
  , end( arg_end ) {}
};

template<class TeamMemberType>
struct ThreadSingleStruct {
  const TeamMemberType& team_member;
  KOKKOS_INLINE_FUNCTION
  ThreadSingleStruct( const TeamMemberType& team_member_ ) : team_member( team_member_ ) {}
};

template<class TeamMemberType>
struct VectorSingleStruct {
  const TeamMemberType& team_member;
  KOKKOS_INLINE_FUNCTION
  VectorSingleStruct( const TeamMemberType& team_member_ ) : team_member( team_member_ ) {}
};

} // namespace Impl

/** \brief  Execution policy for parallel work over a threads within a team.
 *
 *  The range is split over all threads in a team. The Mapping scheme depends on the architecture.
 *  This policy is used together with a parallel pattern as a nested layer within a kernel launched
 *  with the TeamPolicy. This variant expects a single count. So the range is (0,count].
 */
template<typename iType, class TeamMemberType, class _never_use_this_overload>
KOKKOS_INLINE_FUNCTION_DELETED
Impl::TeamThreadRangeBoundariesStruct<iType,TeamMemberType>
TeamThreadRange( const TeamMemberType&, const iType& count ) = delete;

/** \brief  Execution policy for parallel work over a threads within a team.
 *
 *  The range is split over all threads in a team. The Mapping scheme depends on the architecture.
 *  This policy is used together with a parallel pattern as a nested layer within a kernel launched
 *  with the TeamPolicy. This variant expects a begin and end. So the range is (begin,end].
 */
template<typename iType1, typename iType2, class TeamMemberType, class _never_use_this_overload>
KOKKOS_INLINE_FUNCTION_DELETED
Impl::TeamThreadRangeBoundariesStruct<typename std::common_type<iType1, iType2>::type, TeamMemberType>
TeamThreadRange( const TeamMemberType&, const iType1& begin, const iType2& end ) = delete;

/** \brief  Execution policy for parallel work over a threads within a team.
 *
 *  The range is split over all threads in a team. The Mapping scheme depends on the architecture.
 *  This policy is used together with a parallel pattern as a nested layer within a kernel launched
 *  with the TeamPolicy. This variant expects a single count. So the range is (0,count].
 */
template<typename iType, class TeamMemberType, class _never_use_this_overload>
KOKKOS_INLINE_FUNCTION_DELETED
Impl::TeamThreadRangeBoundariesStruct<iType,TeamMemberType>
TeamVectorRange( const TeamMemberType&, const iType& count ) = delete;

/** \brief  Execution policy for parallel work over a threads within a team.
 *
 *  The range is split over all threads in a team. The Mapping scheme depends on the architecture.
 *  This policy is used together with a parallel pattern as a nested layer within a kernel launched
 *  with the TeamPolicy. This variant expects a begin and end. So the range is (begin,end].
 */
template<typename iType1, typename iType2, class TeamMemberType, class _never_use_this_overload>
KOKKOS_INLINE_FUNCTION_DELETED
Impl::TeamThreadRangeBoundariesStruct<typename std::common_type<iType1, iType2>::type, TeamMemberType>
TeamVectorRange( const TeamMemberType&, const iType1& begin, const iType2& end ) = delete;

/** \brief  Execution policy for a vector parallel loop.
 *
 *  The range is split over all vector lanes in a thread. The Mapping scheme depends on the architecture.
 *  This policy is used together with a parallel pattern as a nested layer within a kernel launched
 *  with the TeamPolicy. This variant expects a single count. So the range is (0,count].
 */
template<typename iType, class TeamMemberType, class _never_use_this_overload>
KOKKOS_INLINE_FUNCTION_DELETED
Impl::ThreadVectorRangeBoundariesStruct<iType,TeamMemberType>
ThreadVectorRange( const TeamMemberType&, const iType& count ) = delete;

template<typename iType, class TeamMemberType, class _never_use_this_overload>
KOKKOS_INLINE_FUNCTION_DELETED
Impl::ThreadVectorRangeBoundariesStruct<iType,TeamMemberType>
ThreadVectorRange( const TeamMemberType&, const iType& arg_begin, const iType& arg_end ) = delete;

#if defined(KOKKOS_ENABLE_PROFILING)
namespace Impl {

template<typename FunctorType, typename TagType,
  bool HasTag = !std::is_same<TagType, void>::value >
struct ParallelConstructName;

template<typename FunctorType, typename TagType>
struct ParallelConstructName<FunctorType, TagType, true> {
  ParallelConstructName(std::string const& label):label_ref(label) {
    if (label.empty()) {
      default_name = std::string(typeid(FunctorType).name()) + "/" +
        typeid(TagType).name();
    }
  }
  std::string const& get() {
    return (label_ref.empty()) ? default_name : label_ref;
  }
  std::string const& label_ref;
  std::string default_name;
};

template<typename FunctorType, typename TagType>
struct ParallelConstructName<FunctorType, TagType, false> {
  ParallelConstructName(std::string const& label):label_ref(label) {
    if (label.empty()) {
      default_name = std::string(typeid(FunctorType).name());
    }
  }
  std::string const& get() {
    return (label_ref.empty()) ? default_name : label_ref;
  }
  std::string const& label_ref;
  std::string default_name;
};

} // namespace Impl
#endif /* defined KOKKOS_ENABLE_PROFILING */

} // namespace Kokkos

namespace Kokkos {
namespace Experimental {

namespace Impl {
  template<class Property,class Policy>
  struct PolicyPropertyAdaptor;

  template<unsigned long P, class ... Properties>
  struct PolicyPropertyAdaptor<WorkItemProperty::ImplWorkItemProperty<P>,RangePolicy<Properties...>> {
    typedef RangePolicy<Properties...> policy_in_t;
    typedef RangePolicy<typename policy_in_t::traits::execution_space,
                        typename policy_in_t::traits::schedule_type,
                        typename policy_in_t::traits::work_tag,
                        typename policy_in_t::traits::index_type,
                        typename policy_in_t::traits::iteration_pattern,
                        typename policy_in_t::traits::launch_bounds,
                        WorkItemProperty::ImplWorkItemProperty<P>> policy_out_t;
  };

  template<unsigned long P, class ... Properties>
  struct PolicyPropertyAdaptor<WorkItemProperty::ImplWorkItemProperty<P>,TeamPolicy<Properties...>> {
    typedef TeamPolicy<Properties...> policy_in_t;
    typedef TeamPolicy<typename policy_in_t::traits::execution_space,
                        typename policy_in_t::traits::schedule_type,
                        typename policy_in_t::traits::work_tag,
                        typename policy_in_t::traits::index_type,
                        typename policy_in_t::traits::iteration_pattern,
                        typename policy_in_t::traits::launch_bounds,
                        WorkItemProperty::ImplWorkItemProperty<P>> policy_out_t;
  };
}

template<class PolicyType,unsigned long P>
constexpr typename Impl::PolicyPropertyAdaptor<WorkItemProperty::ImplWorkItemProperty<P>,PolicyType>::policy_out_t
  require(const PolicyType p, WorkItemProperty::ImplWorkItemProperty<P>){
    return typename Impl::PolicyPropertyAdaptor<WorkItemProperty::ImplWorkItemProperty<P>,PolicyType>::policy_out_t(p);
}
} //Experimental
} //Kokkos
#endif /* #define KOKKOS_EXECPOLICY_HPP */