/*!

******************************************************************************

*

* \file

*

* \brief RAJA header file containing an implementation of std align.

*

******************************************************************************

*/

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//

// Copyright (c) 2016-18, Lawrence Livermore National Security, LLC.

//

// Produced at the Lawrence Livermore National Laboratory

//

// LLNL-CODE-689114

//

// All rights reserved.

//

// This file is part of RAJA.

//

// For details about use and distribution, please read RAJA/LICENSE.

//

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//

#ifndef COMBRAJA_ALIGN_HPP

#define COMBRAJA_ALIGN_HPP

//#include "RAJA/config.hpp"

#include "config.hpp"

#define COMBRAJA_INLINE inline

namespace COMBRAJA

{

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//

// Taken from libc++

// See libc++ license in docs/Licenses/libc++ License

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//

COMBRAJA_INLINE

void* align(size_t alignment, size_t size, void*& ptr, size_t& space)

{

void* r = nullptr;

if (size <= space) {

char* p1 = static_cast<char*>(ptr);

char* p2 = reinterpret_cast<char*>(

reinterpret_cast<size_t>(p1 + (alignment - 1)) & -alignment);

size_t d = static_cast<size_t>(p2 - p1);

if (d <= space - size) {

r = p2;

ptr = r;

space -= d;

}

}

return r;

}

} // end namespace COMBRAJA

#endif