/*
 * This file is part of the GROMACS molecular simulation package.
 *
 * Copyright (c) 2014,2015,2019,2020, by the GROMACS development team, led by
 * Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
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/*! \internal \file
 *
 * \brief
 * Defines constants used to know which Nbnxm kernel flavours (4xn or 2xnn)
 * can be supported by the SIMD layer in use.
 *
 * \author Berk Hess <hess@kth.se>
 * \ingroup module_nbnxm
 */
#ifndef GMX_NBNXM_NBNXM_SIMD_H
#define GMX_NBNXM_NBNXM_SIMD_H

#include "config.h"

#include "gromacs/math/vectypes.h"
#include "gromacs/simd/simd.h"
#include "gromacs/utility/real.h"

#if GMX_SIMD && GMX_USE_SIMD_KERNELS
/*! \brief The nbnxn SIMD 4xN and 2x(N+N) kernels can be added independently.
 * Currently the 2xNN SIMD kernels only make sense with:
 *  8-way SIMD: 4x4 setup, works with AVX-256 in single precision
 * 16-way SIMD: 4x8 setup, works with Intel MIC in single precision
 */
#    if GMX_SIMD_REAL_WIDTH == 2 || GMX_SIMD_REAL_WIDTH == 4 || GMX_SIMD_REAL_WIDTH == 8
#        define GMX_NBNXN_SIMD_4XN
#    endif
#    if GMX_SIMD_REAL_WIDTH == 8 || GMX_SIMD_REAL_WIDTH == 16
#        define GMX_NBNXN_SIMD_2XNN
#    endif

#    if !(defined GMX_NBNXN_SIMD_4XN || defined GMX_NBNXN_SIMD_2XNN)
#        error "No SIMD kernel type defined"
#    endif

#endif // GMX_SIMD && GMX_USE_SIMD_KERNELS

#endif
