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lammps/lib/kokkos/core/src/impl/Kokkos_Atomic_Decrement.hpp
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Kokkos_Atomic_Decrement.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_DECREMENT_HPP )
#define KOKKOS_ATOMIC_DECREMENT_HPP
#include "impl/Kokkos_Atomic_Fetch_Sub.hpp"
namespace Kokkos {
// Atomic increment
template<>
KOKKOS_INLINE_FUNCTION
void atomic_decrement<char>(volatile char* a) {
#if defined( KOKKOS_ENABLE_ASM ) && defined( KOKKOS_ENABLE_ISA_X86_64 ) && ! defined(_WIN32) && ! defined(__CUDA_ARCH__)
__asm__ __volatile__(
"lock decb %0"
: /* no output registers */
: "m" (a[0])
: "memory"
);
#else
Kokkos::atomic_fetch_sub(a, 1);
#endif
}
template<>
KOKKOS_INLINE_FUNCTION
void atomic_decrement<short>(volatile short* a) {
#if defined( KOKKOS_ENABLE_ASM ) && defined( KOKKOS_ENABLE_ISA_X86_64 ) && ! defined(_WIN32) && ! defined(__CUDA_ARCH__)
__asm__ __volatile__(
"lock decw %0"
: /* no output registers */
: "m" (a[0])
: "memory"
);
#else
Kokkos::atomic_fetch_sub(a, 1);
#endif
}
template<>
KOKKOS_INLINE_FUNCTION
void atomic_decrement<int>(volatile int* a) {
#if defined( KOKKOS_ENABLE_ASM ) && defined( KOKKOS_ENABLE_ISA_X86_64 ) && ! defined(_WIN32) && ! defined(__CUDA_ARCH__)
__asm__ __volatile__(
"lock decl %0"
: /* no output registers */
: "m" (a[0])
: "memory"
);
#else
Kokkos::atomic_fetch_sub(a, 1);
#endif
}
template<>
KOKKOS_INLINE_FUNCTION
void atomic_decrement<long long int>(volatile long long int* a) {
#if defined( KOKKOS_ENABLE_ASM ) && defined( KOKKOS_ENABLE_ISA_X86_64 ) && ! defined(_WIN32) && ! defined(__CUDA_ARCH__)
__asm__ __volatile__(
"lock decq %0"
: /* no output registers */
: "m" (a[0])
: "memory"
);
#else
Kokkos::atomic_fetch_sub(a, 1);
#endif
}
template<typename T>
KOKKOS_INLINE_FUNCTION
void atomic_decrement(volatile T* a) {
Kokkos::atomic_fetch_sub(a, 1);
}
} // End of namespace Kokkos
#endif
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