dotu.hpp

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//
// Copyright (c) 2017-2021, University of Tennessee. All rights reserved.
// Copyright (c) 2025, University of Colorado Denver. All rights reserved.
//
// This file is part of <T>LAPACK.
// <T>LAPACK is free software: you can redistribute it and/or modify it under
// the terms of the BSD 3-Clause license. See the accompanying LICENSE file.
 
#ifndef TLAPACK_BLAS_DOTU_HH
#define TLAPACK_BLAS_DOTU_HH
 
#include "tlapack/base/utils.hpp"
 
namespace tlapack {
 
template <
    TLAPACK_VECTOR vectorX_t,
    TLAPACK_VECTOR vectorY_t,
    class T = type_t<vectorY_t>,
    disable_if_allow_optblas_t<pair<vectorX_t, T>, pair<vectorY_t, T> > = 0>
auto dotu(const vectorX_t& x, const vectorY_t& y)
{
    using return_t = scalar_type<type_t<vectorX_t>, type_t<vectorY_t> >;
    using idx_t = size_type<vectorX_t>;
 
    // constants
    const idx_t n = size(x);
 
    // check arguments
    tlapack_check_false(size(y) != n);
 
    return_t result(0);
    for (idx_t i = 0; i < n; ++i)
        result += x[i] * y[i];
 
    return result;
}
 
#ifdef TLAPACK_USE_LAPACKPP
 
template <
    TLAPACK_LEGACY_VECTOR vectorX_t,
    TLAPACK_LEGACY_VECTOR vectorY_t,
    class T = type_t<vectorY_t>,
    enable_if_allow_optblas_t<pair<vectorX_t, T>, pair<vectorY_t, T> > = 0>
auto dotu(const vectorX_t& x, const vectorY_t& y)
{
    // Legacy objects
    auto x_ = legacy_vector(x);
    auto y_ = legacy_vector(y);
 
    // Constants to forward
    const auto& n = x_.n;
 
    return ::blas::dotu(n, x_.ptr, x_.inc, y_.ptr, y_.inc);
}
 
#endif
 
}  // namespace tlapack
 
#endif  //  #ifndef TLAPACK_BLAS_DOTU_HH