Page Menu
Home
c4science
Search
Configure Global Search
Log In
Files
F73820607
Kokkos_Atomic_Fetch_Sub.hpp
No One
Temporary
Actions
Download File
Edit File
Delete File
View Transforms
Subscribe
Mute Notifications
Award Token
Subscribers
None
File Metadata
Details
File Info
Storage
Attached
Created
Wed, Jul 24, 16:27
Size
6 KB
Mime Type
text/x-c++
Expires
Fri, Jul 26, 16:27 (1 d, 23 h)
Engine
blob
Format
Raw Data
Handle
19275137
Attached To
rLAMMPS lammps
Kokkos_Atomic_Fetch_Sub.hpp
View Options
/*
//@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
Event Timeline
Log In to Comment