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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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