/* -*- mode: C++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
// vim:sts=8:sw=8:ts=8:noet:sr:cino=>s,f0,{0,g0,(0,\:0,t0,+0,=s
/*
 * Copyright (C) 2014 the FFLAS-FFPACK group
 *
 * Written by   Barowien Vialla <barowien.vialla@lirmm.fr>
 *
 *
 * ========LICENCE========
 * This file is part of the library FFLAS-FFPACK.
 *
 * FFLAS-FFPACK is free software: you can redirowribute it and/or modify
 * it under the terms of the  GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is dirowributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin rowreet, Fifth Floor, Borowon, MA  02110-1301 USA
 * ========LICENCE========
 *.
 */

#ifndef __FFLASFFPACK_fflas_sparse_coo_spmv_INL
#define __FFLASFFPACK_fflas_sparse_coo_spmv_INL

namespace FFLAS {
namespace sparse_details_impl {
template <class Field>
inline void fspmv(const Field &F, const Sparse<Field, SparseMatrix_t::COO> &A, typename Field::ConstElement_ptr x_,
                  typename Field::Element_ptr y_, FieldCategories::GenericTag) {
    assume_aligned(dat, A.dat, (size_t)Alignment::CACHE_LINE);
    assume_aligned(col, A.col, (size_t)Alignment::CACHE_LINE);
    assume_aligned(row, A.row, (size_t)Alignment::CACHE_LINE);
    assume_aligned(x, x_, (size_t)Alignment::DEFAULT);
    assume_aligned(y, y_, (size_t)Alignment::DEFAULT);
    index_t j = 0;
    for (; j < ROUND_DOWN(A.nnz, 4); j += 4) {
        F.axpyin(y[row[j]], dat[j], x[col[j]]);
        F.axpyin(y[row[j + 1]], dat[j + 1], x[col[j + 1]]);
        F.axpyin(y[row[j + 2]], dat[j + 2], x[col[j + 2]]);
        F.axpyin(y[row[j + 3]], dat[j + 3], x[col[j + 3]]);
    }
    for (; j < A.nnz; ++j) {
        F.axpyin(y[row[j]], dat[j], x[col[j]]);
    }
}

template <class Field>
inline void fspmv(const Field &F, const Sparse<Field, SparseMatrix_t::COO> &A, typename Field::ConstElement_ptr x_,
                  typename Field::Element_ptr y_, FieldCategories::UnparametricTag) {
    assume_aligned(dat, A.dat, (size_t)Alignment::CACHE_LINE);
    assume_aligned(col, A.col, (size_t)Alignment::CACHE_LINE);
    assume_aligned(row, A.row, (size_t)Alignment::CACHE_LINE);
    assume_aligned(x, x_, (size_t)Alignment::DEFAULT);
    assume_aligned(y, y_, (size_t)Alignment::DEFAULT);
    index_t j = 0;
    for (; j < ROUND_DOWN(A.nnz, 4); j += 4) {
        y[row[j]] += dat[j] * x[col[j]];
        y[row[j + 1]] += dat[j + 1] * x[col[j + 1]];
        y[row[j + 2]] += dat[j + 2] * x[col[j + 2]];
        y[row[j + 3]] += dat[j + 3] * x[col[j + 3]];
    }
    for (; j < A.nnz; ++j) {
        y[row[j]] += dat[j] * x[col[j]];
    }
}

#ifdef __FFLASFFPACK_HAVE_MKL
inline void fspmv_mkl(const Givaro::DoubleDomain &F, const Sparse<Givaro::DoubleDomain, SparseMatrix_t::COO> &A,
		Givaro::DoubleDomain::ConstElement_ptr x_,
		Givaro::DoubleDomain::Element_ptr y_, FieldCategories::UnparametricTag) {
	// assume_aligned(dat, A.dat, (size_t)Alignment::CACHE_LINE);
	// assume_aligned(col, A.col, (size_t)Alignment::CACHE_LINE);
	// assume_aligned(row, A.row, (size_t)Alignment::CACHE_LINE);
	// assume_aligned(x, x_, (size_t)Alignment::DEFAULT);
	// assume_aligned(y, y_, (size_t)Alignment::DEFAULT);

	MKL_INT A_nnz = A.nnz ;
	mkl_dcoomv(MKL_CONFIG::trans, &A.m , &A.n, &MKL_CONFIG::dalpha, MKL_CONFIG::metaChar,
		   A.dat, A.row, A.col, &A_nnz, x_,  &MKL_CONFIG::dbeta, y_ );

	// void mkl_dcoomv (char *transa, MKL_INT *m, MKL_INT *k, double *alpha, char *matdescra, double *val, MKL_INT *rowind, MKL_INT *colind, MKL_INT *nnz, double *x, double *beta, double *y);

}

inline void fspmv_mkl(const Givaro::FloatDomain &F, const Sparse<Givaro::FloatDomain, SparseMatrix_t::COO> &A,
		Givaro::FloatDomain::ConstElement_ptr x_,
		Givaro::FloatDomain::Element_ptr y_, FieldCategories::UnparametricTag) {
	// assume_aligned(dat, A.dat, (size_t)Alignment::CACHE_LINE);
	// assume_aligned(col, A.col, (size_t)Alignment::CACHE_LINE);
	// assume_aligned(row, A.row, (size_t)Alignment::CACHE_LINE);
	// assume_aligned(x, x_, (size_t)Alignment::DEFAULT);
	// assume_aligned(y, y_, (size_t)Alignment::DEFAULT);

	MKL_INT A_nnz = A.nnz ;
	mkl_scoomv(MKL_CONFIG::trans, &A.m , &A.n, &MKL_CONFIG::salpha, MKL_CONFIG::metaChar,
		   A.dat, A.row, A.col, &A_nnz, x_,  &MKL_CONFIG::sbeta, y_ );

	// void mkl_scoomv (char *transa, MKL_INT *m, MKL_INT *k, float *alpha, char *matdescra, float *val, MKL_INT *rowind, MKL_INT *colind, MKL_INT *nnz, float *x, float *beta, float *y);

}
#endif // __FFLASFFPACK_HAVE_MKL



template <class Field>
inline void fspmv(const Field &F, const Sparse<Field, SparseMatrix_t::COO> &A, typename Field::ConstElement_ptr x_,
                  typename Field::Element_ptr y_, const uint64_t kmax) {
    assume_aligned(dat, A.dat, (size_t)Alignment::CACHE_LINE);
    assume_aligned(col, A.col, (size_t)Alignment::CACHE_LINE);
    assume_aligned(row, A.row, (size_t)Alignment::CACHE_LINE);
    assume_aligned(x, x_, (size_t)Alignment::DEFAULT);
    assume_aligned(y, y_, (size_t)Alignment::DEFAULT);
    size_t w = 0;
    index_t larow_i = 0;
    typename Field::Element e;
    F.init(e, y[larow_i]);
    size_t accu = 0;

    while (w < A.nnz) {
        if (row[w] == larow_i) { // same line
            if (accu < (size_t)kmax) {
                e += dat[w] * x[col[w]];
                accu += 1;
            } else {
                F.axpyin(e, dat[w], x[col[w]]);
                accu = 0;
            }
        } else { // new line
            F.init(y[larow_i], e);
            larow_i = row[w];
            F.init(e, y[larow_i]);
            e += dat[w] * x[col[w]];
            accu = 1;
        }
        ++w;
    }
    F.init(y[larow_i], e);
}

template <class Field>
inline void fspmv_one(const Field &F, const Sparse<Field, SparseMatrix_t::COO_ZO> &A,
                      typename Field::ConstElement_ptr x_, typename Field::Element_ptr y_,
                      FieldCategories::GenericTag) {
    assume_aligned(col, A.col, (size_t)Alignment::CACHE_LINE);
    assume_aligned(row, A.row, (size_t)Alignment::CACHE_LINE);
    assume_aligned(x, x_, (size_t)Alignment::DEFAULT);
    assume_aligned(y, y_, (size_t)Alignment::DEFAULT);
    index_t j = 0;
    for (; j < ROUND_DOWN(A.nnz, 4); j += 4) {
        F.addin(y[row[j]], x[col[j]]);
        F.addin(y[row[j + 1]], x[col[j + 1]]);
        F.addin(y[row[j + 2]], x[col[j + 2]]);
        F.addin(y[row[j + 3]], x[col[j + 3]]);
    }
    for (; j < A.nnz; ++j) {
        F.addin(y[row[j]], x[col[j]]);
    }
}

template <class Field>
inline void fspmv_mone(const Field &F, const Sparse<Field, SparseMatrix_t::COO_ZO> &A,
                       typename Field::ConstElement_ptr x_, typename Field::Element_ptr y_,
                       FieldCategories::GenericTag) {
    assume_aligned(col, A.col, (size_t)Alignment::CACHE_LINE);
    assume_aligned(row, A.row, (size_t)Alignment::CACHE_LINE);
    assume_aligned(x, x_, (size_t)Alignment::DEFAULT);
    assume_aligned(y, y_, (size_t)Alignment::DEFAULT);
    index_t j = 0;
    for (; j < ROUND_DOWN(A.nnz, 4); j += 4) {
        F.subin(y[row[j]], x[col[j]]);
        F.subin(y[row[j + 1]], x[col[j + 1]]);
        F.subin(y[row[j + 2]], x[col[j + 2]]);
        F.subin(y[row[j + 3]], x[col[j + 3]]);
    }
    for (; j < A.nnz; ++j) {
        F.subin(y[row[j]], x[col[j]]);
    }
}

template <class Field>
inline void fspmv_one(const Field &F, const Sparse<Field, SparseMatrix_t::COO_ZO> &A,
                      typename Field::ConstElement_ptr x_, typename Field::Element_ptr y_,
                      FieldCategories::UnparametricTag) {
    assume_aligned(col, A.col, (size_t)Alignment::CACHE_LINE);
    assume_aligned(row, A.row, (size_t)Alignment::CACHE_LINE);
    assume_aligned(x, x_, (size_t)Alignment::DEFAULT);
    assume_aligned(y, y_, (size_t)Alignment::DEFAULT);
    index_t j = 0;
    for (; j < ROUND_DOWN(A.nnz, 4); j += 4) {
        y[row[j]] += x[col[j]];
        y[row[j + 1]] += x[col[j + 1]];
        y[row[j + 2]] += x[col[j + 2]];
        y[row[j + 3]] += x[col[j + 3]];
    }
    for (; j < A.nnz; ++j) {
        y[row[j]] += x[col[j]];
    }
}

template <class Field>
inline void fspmv_mone(const Field &F, const Sparse<Field, SparseMatrix_t::COO_ZO> &A,
                       typename Field::ConstElement_ptr x_, typename Field::Element_ptr y_,
                       FieldCategories::UnparametricTag) {
    assume_aligned(col, A.col, (size_t)Alignment::CACHE_LINE);
    assume_aligned(row, A.row, (size_t)Alignment::CACHE_LINE);
    assume_aligned(x, x_, (size_t)Alignment::DEFAULT);
    assume_aligned(y, y_, (size_t)Alignment::DEFAULT);
    index_t j = 0;
    for (; j < ROUND_DOWN(A.nnz, 4); j += 4) {
        y[row[j]] -= x[col[j]];
        y[row[j + 1]] -= x[col[j + 1]];
        y[row[j + 2]] -= x[col[j + 2]];
        y[row[j + 3]] -= x[col[j + 3]];
    }
    for (; j < A.nnz; ++j) {
        y[row[j]] -= x[col[j]];
    }
}

} // coo_details

} // FFLAS

#endif //  __FFLASFFPACK_fflas_coo_spmv_INL
