///////////////////////////////////////////////////////////////////////
// File:        dotproduct.h
// 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.
///////////////////////////////////////////////////////////////////////

#ifndef TESSERACT_ARCH_DOTPRODUCT_H_
#define TESSERACT_ARCH_DOTPRODUCT_H_

namespace tesseract {

// Computes and returns the dot product of the n-vectors u and v.
double DotProductNative(const double* u, const double* v, int n);

// Uses Intel AVX intrinsics to access the SIMD instruction set.
double DotProductAVX(const double* u, const double* v, int n);

// Use Intel FMA.
double DotProductFMA(const double* u, const double* v, int n);

// Uses Intel SSE intrinsics to access the SIMD instruction set.
double DotProductSSE(const double* u, const double* v, int n);

}  // namespace tesseract.

#endif  // TESSERACT_ARCH_DOTPRODUCT_H_