src/gromacs/nbnxm/nbnxm_simd.h

   1 /*
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  35 /*! \internal \file
  36  *
  37  * \brief
  38  * Defines constants used to know which Nbnxm kernel flavours (4xn or 2xnn)
  39  * can be supported by the SIMD layer in use.
  40  *
  41  * \author Berk Hess <hess@kth.se>
  42  * \ingroup module_nbnxm
  43  */
  44 #ifndef GMX_NBNXM_NBNXM_SIMD_H
  45 #define GMX_NBNXM_NBNXM_SIMD_H
  46
  47 #include "config.h"
  48
  49 #include "gromacs/math/vectypes.h"
  50 #include "gromacs/simd/simd.h"
  51 #include "gromacs/utility/real.h"
  52
  53 #if GMX_SIMD && GMX_USE_SIMD_KERNELS
  54 /*! \brief The nbnxn SIMD 4xN and 2x(N+N) kernels can be added independently.
  55  * Currently the 2xNN SIMD kernels only make sense with:
  56  *  8-way SIMD: 4x4 setup, works with AVX-256 in single precision
  57  * 16-way SIMD: 4x8 setup, works with Intel MIC in single precision
  58  */
  59 #    if GMX_SIMD_REAL_WIDTH == 2 || GMX_SIMD_REAL_WIDTH == 4 || GMX_SIMD_REAL_WIDTH == 8
  60 #        define GMX_NBNXN_SIMD_4XN
  61 #    endif
  62 #    if GMX_SIMD_REAL_WIDTH == 8 || GMX_SIMD_REAL_WIDTH == 16
  63 #        define GMX_NBNXN_SIMD_2XNN
  64 #    endif
  65
  66 #    if !(defined GMX_NBNXN_SIMD_4XN || defined GMX_NBNXN_SIMD_2XNN)
  67 #        error "No SIMD kernel type defined"
  68 #    endif
  69
  70 #endif // GMX_SIMD && GMX_USE_SIMD_KERNELS
  71
  72 #endif