multigrid_helper.cuh

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#pragma once

namespace quda {

  template <int fineSpin, int coarseSpin>
  struct spin_mapper {
    // fineSpin == 1, coarseSpin == 2 identifies staggered fine -> coarse w/ spin.
    static constexpr int spin_block_size = (fineSpin == 1 && coarseSpin == 2) ? 0 : fineSpin / coarseSpin;

    __device__ __host__ constexpr inline int operator()( int s, int parity ) const
    { return (spin_block_size == 0) ? parity : s / spin_block_size; }
  };



}