Grid_generic_types.h

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/*************************************************************************************
 
    Grid physics library, www.github.com/paboyle/Grid 
 
    Source file: ./lib/simd/Grid_generic_types.h
 
    Copyright (C) 2017
 
Author: Antonin Portelli <antonin.portelli@me.com>
        Andrew Lawson    <andrew.lawson1991@gmail.com>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
    See the full license in the file "LICENSE" in the top level distribution directory
*************************************************************************************/
/*  END LEGAL */
 
static_assert(GEN_SIMD_WIDTH % 16u == 0, "SIMD vector size is not an integer multiple of 16 bytes");
 
#undef VECTOR_LOOPS
 
// playing with compiler pragmas
 
#ifdef VECTOR_LOOPS
#ifdef __clang__
#define VECTOR_FOR(i, w, inc)                       \
  _Pragma("clang loop unroll(full) vectorize(enable) interleave(enable) vectorize_width(w)") \
  for (unsigned int i = 0; i < w; i += inc)
#elif defined __INTEL_COMPILER
#define VECTOR_FOR(i, w, inc)           \
  _Pragma("simd vectorlength(w*8)")     \
  for (unsigned int i = 0; i < w; i += inc)
#else
#define VECTOR_FOR(i, w, inc)           \
  for (unsigned int i = 0; i < w; i += inc)
#endif
#else
#define VECTOR_FOR(i, w, inc)           \
  for (unsigned int i = 0; i < w; i += inc)
#endif
 
NAMESPACE_BEGIN(Grid);
NAMESPACE_BEGIN(Optimization);
 
#ifdef GENERIC_SCALAR
 
// type traits giving the number of elements for each vector type
template <typename T> struct W;
template <> struct W<double> {
  constexpr static unsigned int c = 1;
  constexpr static unsigned int r = 2;
};
template <> struct W<float> {
  constexpr static unsigned int c = 1;
  constexpr static unsigned int r = 2;
};
template <> struct W<Integer> {
  constexpr static unsigned int r = 1;
};
template <> struct W<uint16_t> {
  constexpr static unsigned int c = 1;
  constexpr static unsigned int r = 2;
};
// SIMD vector types
template <typename T>
struct vec {
  T v[W<T>::r];
};
#else 
// type traits giving the number of elements for each vector type
template <typename T> struct W;
template <> struct W<double> {
  constexpr static unsigned int c = GEN_SIMD_WIDTH/16u;
  constexpr static unsigned int r = GEN_SIMD_WIDTH/8u;
};
template <> struct W<float> {
  constexpr static unsigned int c = GEN_SIMD_WIDTH/8u;
  constexpr static unsigned int r = GEN_SIMD_WIDTH/4u;
};
template <> struct W<Integer> {
  constexpr static unsigned int r = GEN_SIMD_WIDTH/4u;
};
template <> struct W<uint16_t> {
  constexpr static unsigned int c = GEN_SIMD_WIDTH/4u;
  constexpr static unsigned int r = GEN_SIMD_WIDTH/2u;
};
// SIMD vector types
template <typename T>
struct vec {
  alignas(GEN_SIMD_WIDTH) T v[W<T>::r];
};
#endif
 
typedef vec<float>     vecf;
typedef vec<double>    vecd;
typedef vec<uint16_t>  vech; // half precision comms
typedef vec<Integer>   veci;
  
NAMESPACE_END(Optimization);
NAMESPACE_END(Grid);