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Kokkos_Atomic_Generic.hpp
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Kokkos_Atomic_Generic.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
*/
#include <Kokkos_Macros.hpp>
#if defined( KOKKOS_ATOMIC_HPP ) && ! defined( KOKKOS_ATOMIC_GENERIC_HPP )
#define KOKKOS_ATOMIC_GENERIC_HPP
#include <Kokkos_Macros.hpp>
// Combination operands to be used in an Compare and Exchange based atomic operation
namespace Kokkos {
namespace Impl {
template<class Scalar1, class Scalar2>
struct MaxOper {
KOKKOS_FORCEINLINE_FUNCTION
static Scalar1 apply(const Scalar1& val1, const Scalar2& val2) {
return (val1 > val2 ? val1 : val2);
}
};
template<class Scalar1, class Scalar2>
struct MinOper {
KOKKOS_FORCEINLINE_FUNCTION
static Scalar1 apply(const Scalar1& val1, const Scalar2& val2) {
return (val1 < val2 ? val1 : val2);
}
};
template<class Scalar1, class Scalar2>
struct AddOper {
KOKKOS_FORCEINLINE_FUNCTION
static Scalar1 apply(const Scalar1& val1, const Scalar2& val2) {
return val1+val2;
}
};
template<class Scalar1, class Scalar2>
struct SubOper {
KOKKOS_FORCEINLINE_FUNCTION
static Scalar1 apply(const Scalar1& val1, const Scalar2& val2) {
return val1-val2;
}
};
template<class Scalar1, class Scalar2>
struct MulOper {
KOKKOS_FORCEINLINE_FUNCTION
static Scalar1 apply(const Scalar1& val1, const Scalar2& val2) {
return val1*val2;
}
};
template<class Scalar1, class Scalar2>
struct DivOper {
KOKKOS_FORCEINLINE_FUNCTION
static Scalar1 apply(const Scalar1& val1, const Scalar2& val2) {
return val1/val2;
}
};
template<class Scalar1, class Scalar2>
struct ModOper {
KOKKOS_FORCEINLINE_FUNCTION
static Scalar1 apply(const Scalar1& val1, const Scalar2& val2) {
return val1%val2;
}
};
template<class Scalar1, class Scalar2>
struct AndOper {
KOKKOS_FORCEINLINE_FUNCTION
static Scalar1 apply(const Scalar1& val1, const Scalar2& val2) {
return val1&val2;
}
};
template<class Scalar1, class Scalar2>
struct OrOper {
KOKKOS_FORCEINLINE_FUNCTION
static Scalar1 apply(const Scalar1& val1, const Scalar2& val2) {
return val1|val2;
}
};
template<class Scalar1, class Scalar2>
struct XorOper {
KOKKOS_FORCEINLINE_FUNCTION
static Scalar1 apply(const Scalar1& val1, const Scalar2& val2) {
return val1^val2;
}
};
template<class Scalar1, class Scalar2>
struct LShiftOper {
KOKKOS_FORCEINLINE_FUNCTION
static Scalar1 apply(const Scalar1& val1, const Scalar2& val2) {
return val1<<val2;
}
};
template<class Scalar1, class Scalar2>
struct RShiftOper {
KOKKOS_FORCEINLINE_FUNCTION
static Scalar1 apply(const Scalar1& val1, const Scalar2& val2) {
return val1>>val2;
}
};
template < class Oper, typename T >
KOKKOS_INLINE_FUNCTION
T atomic_fetch_oper( const Oper& op, 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 = Oper::apply(assume.t, val) ;
oldval.i = Kokkos::atomic_compare_exchange( (unsigned long long int*)dest , assume.i , newval.i );
} while ( assume.i != oldval.i );
return oldval.t ;
}
template < class Oper, typename T >
KOKKOS_INLINE_FUNCTION
T atomic_oper_fetch( const Oper& op, 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 = Oper::apply(assume.t, val) ;
oldval.i = Kokkos::atomic_compare_exchange( (unsigned long long int*)dest , assume.i , newval.i );
} while ( assume.i != oldval.i );
return newval.t ;
}
template < class Oper, typename T >
KOKKOS_INLINE_FUNCTION
T atomic_fetch_oper( const Oper& op, 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 = Oper::apply(assume.t, val) ;
oldval.i = Kokkos::atomic_compare_exchange( (int*)dest , assume.i , newval.i );
} while ( assume.i != oldval.i );
return oldval.t ;
}
template < class Oper, typename T >
KOKKOS_INLINE_FUNCTION
T atomic_oper_fetch( const Oper& op, 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 = Oper::apply(assume.t, val) ;
oldval.i = Kokkos::atomic_compare_exchange( (int*)dest , assume.i , newval.i );
} while ( assume.i != oldval.i );
return newval.t ;
}
template < class Oper, typename T >
KOKKOS_INLINE_FUNCTION
T atomic_fetch_oper( const Oper& op, volatile T * const dest ,
typename Kokkos::Impl::enable_if<
( sizeof(T) != 4 )
&& ( sizeof(T) != 8 )
#if defined(KOKKOS_ENABLE_ASM) && defined(KOKKOS_ACTIVE_EXECUTION_MEMORY_SPACE_HOST)
&& ( sizeof(T) != 16 )
#endif
, const T >::type val )
{
#ifdef KOKKOS_ACTIVE_EXECUTION_MEMORY_SPACE_HOST
while( !Impl::lock_address_host_space( (void*) dest ) );
T return_val = *dest;
*dest = Oper::apply(return_val, val);
Impl::unlock_address_host_space( (void*) dest );
return return_val;
#else
// This is a way to (hopefully) avoid dead lock in a warp
T return_val;
int done = 0;
unsigned int active = __ballot(1);
unsigned int done_active = 0;
while (active!=done_active) {
if(!done) {
if( Impl::lock_address_cuda_space( (void*) dest ) ) {
return_val = *dest;
*dest = Oper::apply(return_val, val);;
Impl::unlock_address_cuda_space( (void*) dest );
done=1;
}
}
done_active = __ballot(done);
}
return return_val;
#endif
}
template < class Oper, typename T >
KOKKOS_INLINE_FUNCTION
T atomic_oper_fetch( const Oper& op, volatile T * const dest ,
typename Kokkos::Impl::enable_if<
( sizeof(T) != 4 )
&& ( sizeof(T) != 8 )
#if defined(KOKKOS_ENABLE_ASM) && defined(KOKKOS_ACTIVE_EXECUTION_MEMORY_SPACE_HOST)
&& ( sizeof(T) != 16 )
#endif
, const T >::type& val )
{
#ifdef KOKKOS_ACTIVE_EXECUTION_MEMORY_SPACE_HOST
while( !Impl::lock_address_host_space( (void*) dest ) );
T return_val = Oper::apply(*dest, val);
*dest = return_val;
Impl::unlock_address_host_space( (void*) dest );
return return_val;
#else
T return_val;
// This is a way to (hopefully) avoid dead lock in a warp
int done = 0;
unsigned int active = __ballot(1);
unsigned int done_active = 0;
while (active!=done_active) {
if(!done) {
if( Impl::lock_address_cuda_space( (void*) dest ) ) {
return_val = Oper::apply(*dest, val);
*dest = return_val;
Impl::unlock_address_cuda_space( (void*) dest );
done=1;
}
}
done_active = __ballot(done);
}
return return_val;
#endif
}
}
}
namespace Kokkos {
// Fetch_Oper atomics: return value before operation
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_fetch_max(volatile T * const dest, const T val) {
return Impl::atomic_fetch_oper(Impl::MaxOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_fetch_min(volatile T * const dest, const T val) {
return Impl::atomic_fetch_oper(Impl::MinOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_fetch_mul(volatile T * const dest, const T val) {
return Impl::atomic_fetch_oper(Impl::MulOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_fetch_div(volatile T * const dest, const T val) {
return Impl::atomic_fetch_oper(Impl::DivOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_fetch_mod(volatile T * const dest, const T val) {
return Impl::atomic_fetch_oper(Impl::ModOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_fetch_and(volatile T * const dest, const T val) {
return Impl::atomic_fetch_oper(Impl::AndOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_fetch_or(volatile T * const dest, const T val) {
return Impl::atomic_fetch_oper(Impl::OrOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_fetch_xor(volatile T * const dest, const T val) {
return Impl::atomic_fetch_oper(Impl::XorOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_fetch_lshift(volatile T * const dest, const unsigned int val) {
return Impl::atomic_fetch_oper(Impl::LShiftOper<T,const unsigned int>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_fetch_rshift(volatile T * const dest, const unsigned int val) {
return Impl::atomic_fetch_oper(Impl::RShiftOper<T,const unsigned int>(),dest,val);
}
// Oper Fetch atomics: return value after operation
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_max_fetch(volatile T * const dest, const T val) {
return Impl::atomic_oper_fetch(Impl::MaxOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_min_fetch(volatile T * const dest, const T val) {
return Impl::atomic_oper_fetch(Impl::MinOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_mul_fetch(volatile T * const dest, const T val) {
return Impl::atomic_oper_fetch(Impl::MulOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_div_fetch(volatile T * const dest, const T val) {
return Impl::atomic_oper_fetch(Impl::DivOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_mod_fetch(volatile T * const dest, const T val) {
return Impl::atomic_oper_fetch(Impl::ModOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_and_fetch(volatile T * const dest, const T val) {
return Impl::atomic_oper_fetch(Impl::AndOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_or_fetch(volatile T * const dest, const T val) {
return Impl::atomic_oper_fetch(Impl::OrOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_xor_fetch(volatile T * const dest, const T val) {
return Impl::atomic_oper_fetch(Impl::XorOper<T,const T>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_lshift_fetch(volatile T * const dest, const unsigned int val) {
return Impl::atomic_oper_fetch(Impl::LShiftOper<T,const unsigned int>(),dest,val);
}
template < typename T >
KOKKOS_INLINE_FUNCTION
T atomic_rshift_fetch(volatile T * const dest, const unsigned int val) {
return Impl::atomic_oper_fetch(Impl::RShiftOper<T,const unsigned int>(),dest,val);
}
} // namespace Kokkos
#endif

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