multigrid_helper.cuh

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#pragma once

namespace quda {

  template <int fineSpin, int coarseSpin>
  struct spin_mapper {
    static constexpr int spin_block_size = fineSpin / coarseSpin;

    __device__ __host__ inline int operator()( int s ) const
    { return s / (spin_block_size > 0 ? spin_block_size : 1); }
  };



}