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lammps/lib/kokkos/core/src/impl/Kokkos_Atomic_Fetch_Sub.hpp
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Kokkos_Atomic_Fetch_Sub.hpp
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/*
//@HEADER
// ************************************************************************
//
// Kokkos v. 2.0
// Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// 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 Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "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 SANDIA CORPORATION OR THE
// 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.
//
// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
//
// ************************************************************************
//@HEADER
*/
#if defined( KOKKOS_ATOMIC_HPP ) && ! defined( KOKKOS_ATOMIC_FETCH_SUB_HPP )
#define KOKKOS_ATOMIC_FETCH_SUB_HPP
namespace Kokkos {
//----------------------------------------------------------------------------
#if defined( KOKKOS_ATOMICS_USE_CUDA )
// Support for int, unsigned int, unsigned long long int, and float
__inline__ __device__
int atomic_fetch_sub( volatile int * const dest , const int val )
{ return atomicSub((int*)dest,val); }
__inline__ __device__
unsigned int atomic_fetch_sub( volatile unsigned int * const dest , const unsigned int val )
{ return atomicSub((unsigned int*)dest,val); }
template < typename T >
__inline__ __device__
T atomic_fetch_sub( volatile T * const dest ,
typename Kokkos::Impl::enable_if< sizeof(T) == sizeof(int) , const T >::type val )
{
union { int i ; T t ; } oldval , assume , newval ;
oldval.t = *dest ;
do {
assume.i = oldval.i ;
newval.t = assume.t - val ;
oldval.i = atomicCAS( (int*)dest , assume.i , newval.i );
} while ( assume.i != oldval.i );
return oldval.t ;
}
template < typename T >
__inline__ __device__
T atomic_fetch_sub( volatile T * const dest ,
typename Kokkos::Impl::enable_if< sizeof(T) != sizeof(int) &&
sizeof(T) == sizeof(unsigned long long int) , const T >::type val )
{
union { unsigned long long int i ; T t ; } oldval , assume , newval ;
oldval.t = *dest ;
do {
assume.i = oldval.i ;
newval.t = assume.t - val ;
oldval.i = atomicCAS( (unsigned long long int*)dest , assume.i , newval.i );
} while ( assume.i != oldval.i );
return oldval.t ;
}
//----------------------------------------------------------------------------
template < typename T >
__inline__ __device__
T atomic_fetch_sub( volatile T * const dest ,
typename ::Kokkos::Impl::enable_if<
( sizeof(T) != 4 )
&& ( sizeof(T) != 8 )
, const T >::type& val )
{
T return_val;
// This is a way to (hopefully) avoid dead lock in a warp
int done = 0;
while ( done>0 ) {
done++;
if( Impl::lock_address_cuda_space( (void*) dest ) ) {
return_val = *dest;
*dest = return_val - val;
Impl::unlock_address_cuda_space( (void*) dest );
done = 0;
}
}
return return_val;
}
//----------------------------------------------------------------------------
#elif defined(KOKKOS_ATOMICS_USE_GCC) || defined(KOKKOS_ATOMICS_USE_INTEL)
KOKKOS_INLINE_FUNCTION
int atomic_fetch_sub( volatile int * const dest , const int val )
{ return __sync_fetch_and_sub(dest,val); }
KOKKOS_INLINE_FUNCTION
long int atomic_fetch_sub( volatile long int * const dest , const long int val )
{ return __sync_fetch_and_sub(dest,val); }
#if defined( KOKKOS_ATOMICS_USE_GCC )
KOKKOS_INLINE_FUNCTION
unsigned int atomic_fetch_sub( volatile unsigned int * const dest , const unsigned int val )
{ return __sync_fetch_and_sub(dest,val); }
KOKKOS_INLINE_FUNCTION
unsigned long int atomic_fetch_sub( volatile unsigned long int * const dest , const unsigned long int val )
{ return __sync_fetch_and_sub(dest,val); }
#endif
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_fetch_sub( volatile T * const dest ,
typename Kokkos::Impl::enable_if< sizeof(T) == sizeof(int) , const T >::type val )
{
union { int i ; T t ; } assume , oldval , newval ;
oldval.t = *dest ;
do {
assume.i = oldval.i ;
newval.t = assume.t - val ;
oldval.i = __sync_val_compare_and_swap( (int*) dest , assume.i , newval.i );
} while ( assume.i != oldval.i );
return oldval.t ;
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_fetch_sub( volatile T * const dest ,
typename Kokkos::Impl::enable_if< sizeof(T) != sizeof(int) &&
sizeof(T) == sizeof(long) , const T >::type val )
{
union { long i ; T t ; } assume , oldval , newval ;
oldval.t = *dest ;
do {
assume.i = oldval.i ;
newval.t = assume.t - val ;
oldval.i = __sync_val_compare_and_swap( (long*) dest , assume.i , newval.i );
} while ( assume.i != oldval.i );
return oldval.t ;
}
//----------------------------------------------------------------------------
template < typename T >
inline
T atomic_fetch_sub( volatile T * const dest ,
typename ::Kokkos::Impl::enable_if<
( sizeof(T) != 4 )
&& ( sizeof(T) != 8 )
, const T >::type& val )
{
while( !Impl::lock_address_host_space( (void*) dest ) );
T return_val = *dest;
*dest = return_val - val;
Impl::unlock_address_host_space( (void*) dest );
return return_val;
}
//----------------------------------------------------------------------------
#elif defined( KOKKOS_ATOMICS_USE_OMP31 )
template< typename T >
T atomic_fetch_sub( volatile T * const dest , const T val )
{
T retval;
#pragma omp atomic capture
{
retval = dest[0];
dest[0] -= val;
}
return retval;
}
#endif
// Simpler version of atomic_fetch_sub without the fetch
template <typename T>
KOKKOS_INLINE_FUNCTION
void atomic_sub(volatile T * const dest, const T src) {
atomic_fetch_sub(dest,src);
}
}
#include<impl/Kokkos_Atomic_Assembly.hpp>
#endif
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