larf.hpp

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//
// 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_LEGACY_LARF_HH
#define TLAPACK_LEGACY_LARF_HH
 
#include "tlapack/lapack/larf.hpp"
 
namespace tlapack {
namespace legacy {
 
    template <class side_t, typename TV, typename TC>
    void larf(side_t side,
              idx_t m,
              idx_t n,
              TV const* v,
              int_t incv,
              scalar_type<TV, TC> tau,
              TC* C,
              idx_t ldC)
    {
        using internal::create_matrix;
 
        // check arguments
        tlapack_check_false(side != Side::Left && side != Side::Right);
        tlapack_check_false(m < 0);
        tlapack_check_false(n < 0);
        tlapack_check_false(incv == 0);
        tlapack_check_false(ldC < m);
 
        // Initialize indexes
        idx_t lenv = ((side == Side::Left) ? m : n);
 
        // Matrix views
        auto C_ = create_matrix<TC>(C, m, n, ldC);
 
        tlapack_expr_with_vector(
            v_, TV, lenv, v, incv,
            return larf(side, FORWARD, COLUMNWISE_STORAGE, v_, tau, C_));
    }
 
}  // namespace legacy
}  // namespace tlapack
 
#endif  // TLAPACK_LEGACY_LARF_HH