host/tensor_compare.h

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/* \file
  \brief Defines host-side elementwise operations on TensorView.
*/

#pragma once

// Standard Library includes
#include <utility>

// Cutlass includes
#include "cutlass/cutlass.h"
#include "cutlass/util/distribution.h"
//#include "cutlass/util/type_traits.h"
#include "tensor_foreach.h"

namespace cutlass {
namespace reference {
namespace host {


namespace detail {

template <
  typename Element,               
  typename Layout>                
struct TensorEqualsFunc {

  //
  // Data members
  //

  TensorView<Element, Layout> lhs;
  TensorView<Element, Layout> rhs;
  bool result;

  TensorEqualsFunc(): result(true) { }

  TensorEqualsFunc(
    TensorView<Element, Layout> const &lhs_,
    TensorView<Element, Layout> const &rhs_
  ) :
    lhs(lhs_), rhs(rhs_), result(true) { }

  void operator()(Coord<Layout::kRank> const &coord) {

    Element lhs_ = lhs.at(coord);
    Element rhs_ = rhs.at(coord);
    
    if (lhs_ != rhs_) {
      result = false;
    }  
  }

  operator bool() const {
    return result;
  }
};

} // namespace detail


template <
  typename Element,               
  typename Layout>                
bool TensorEquals(
  TensorView<Element, Layout> const &lhs, 
  TensorView<Element, Layout> const &rhs) {

  // Extents must be identical
  if (lhs.extent() != rhs.extent()) {
    return false;
  }

  detail::TensorEqualsFunc<Element, Layout> func(lhs, rhs);
  TensorForEach(
    lhs.extent(),
    func
  );

  return bool(func);
}


template <
  typename Element,               
  typename Layout>                
bool TensorNotEquals(
  TensorView<Element, Layout> const &lhs, 
  TensorView<Element, Layout> const &rhs) {

  // Extents must be identical
  if (lhs.extent() != rhs.extent()) {
    return true;
  }

  detail::TensorEqualsFunc<Element, Layout> func(lhs, rhs);
  TensorForEach(
    lhs.extent(),
    func
  );

  return !bool(func);
}


namespace detail {

template <
  typename Element,               
  typename Layout>                
struct TensorContainsFunc {

  //
  // Data members
  //

  TensorView<Element, Layout> view;
  Element value;
  bool contains;
  Coord<Layout::kRank> location;

  //
  // Methods
  //

  TensorContainsFunc(): contains(false) { }

  TensorContainsFunc(
    TensorView<Element, Layout> const &view_,
    Element value_
  ) :
    view(view_), value(value_), contains(false) { }

  void operator()(Coord<Layout::kRank> const &coord) {

    if (view.at(coord) == value) {
      if (!contains) {
        location = coord; 
      }
      contains = true;
    }
  }

  operator bool() const {
    return contains;
  }
};

} // namespace detail


template <
  typename Element,               
  typename Layout>                
bool TensorContains(
  TensorView<Element, Layout> const & view,
  Element value) {

  detail::TensorContainsFunc<Element, Layout> func(
    view,
    value
  );

  TensorForEach(
    view.extent(),
    func
  );

  return bool(func);
}


template <
  typename Element,               
  typename Layout>                
std::pair<bool, Coord<Layout::kRank> > TensorFind(
  TensorView<Element, Layout> const & view,
  Element value) {

  detail::TensorContainsFunc<Element, Layout> func(
    view,
    value
  );

  TensorForEach(
    view.extent(),
    func
  );

  return std::make_pair(bool(func), func.location);
}


} // namespace host
} // namespace reference
} // namespace cutlass