ceph/src/boost/libs/compute/include/boost/compute/functional/detail/nvidia_popcount.hpp

   1 //---------------------------------------------------------------------------//
   2 // Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
   3 //
   4 // Distributed under the Boost Software License, Version 1.0
   5 // See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt
   7 //
   8 // See http://boostorg.github.com/compute for more information.
   9 //---------------------------------------------------------------------------//
  10
  11 #ifndef BOOST_COMPUTE_FUNCTIONAL_DETAIL_NVIDIA_POPCOUNT_HPP
  12 #define BOOST_COMPUTE_FUNCTIONAL_DETAIL_NVIDIA_POPCOUNT_HPP
  13
  14 #include <boost/compute/function.hpp>
  15
  16 namespace boost {
  17 namespace compute {
  18 namespace detail {
  19
  20 template<class T>
  21 class nvidia_popcount : public function<T(T)>
  22 {
  23 public:
  24     nvidia_popcount()
  25         : function<T(T)>("nvidia_popcount")
  26     {
  27         this->set_source(
  28             "inline uint nvidia_popcount(const uint x)\n"
  29             "{\n"
  30             "    uint count;\n"
  31             "    asm(\"popc.b32 %0, %1;\" : \"=r\"(count) : \"r\"(x));\n"
  32             "    return count;\n"
  33             "}\n"
  34         );
  35     }
  36 };
  37
  38 } // end detail namespace
  39 } // end compute namespace
  40 } // end boost namespace
  41
  42 #endif // BOOST_COMPUTE_FUNCTIONAL_DETAIL_NVIDIA_POPCOUNT_HPP