///////////////////////////////////////////////////////////////////////

// File:        dotproduct.cpp

// Description: Native dot product function.

//

// (C) Copyright 2018, Google Inc.

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

///////////////////////////////////////////////////////////////////////

#include "dotproduct.h"

namespace tesseract {

// Computes and returns the dot product of the two n-vectors u and v.

TFloat DotProductNative(const TFloat *u, const TFloat *v, int n) {

  TFloat total = 0;

#if defined(OPENMP_SIMD) || defined(_OPENMP)

#pragma omp simd reduction(+:total)

#endif

  for (int k = 0; k < n; k++) {

    total += u[k] * v[k];

  }

  return total;

}

} // namespace tesseract