1 | // This file is part of Eigen, a lightweight C++ template library
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2 | // for linear algebra.
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3 | //
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4 | // Copyright (C) 2012 Chen-Pang He <jdh8@ms63.hinet.net>
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5 | //
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6 | // This Source Code Form is subject to the terms of the Mozilla
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7 | // Public License v. 2.0. If a copy of the MPL was not distributed
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8 | // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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9 |
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10 | #ifndef EIGEN_SELFADJOINT_PACKED_PRODUCT_H
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11 | #define EIGEN_SELFADJOINT_PACKED_PRODUCT_H
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12 |
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13 | namespace internal {
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14 |
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15 | /* Optimized matrix += alpha * uv'
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16 | * The matrix is in packed form.
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17 | */
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18 | template<typename Scalar, typename Index, int StorageOrder, int UpLo, bool ConjLhs, bool ConjRhs>
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19 | struct selfadjoint_packed_rank1_update;
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20 |
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21 | template<typename Scalar, typename Index, int UpLo, bool ConjLhs, bool ConjRhs>
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22 | struct selfadjoint_packed_rank1_update<Scalar,Index,ColMajor,UpLo,ConjLhs,ConjRhs>
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23 | {
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24 | typedef typename NumTraits<Scalar>::Real RealScalar;
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25 | static void run(Index size, Scalar* mat, const Scalar* vec, RealScalar alpha)
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26 | {
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27 | typedef Map<const Matrix<Scalar,Dynamic,1> > OtherMap;
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28 | typedef typename conj_expr_if<ConjLhs,OtherMap>::type ConjRhsType;
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29 | conj_if<ConjRhs> cj;
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30 |
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31 | for (Index i=0; i<size; ++i)
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32 | {
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33 | Map<Matrix<Scalar,Dynamic,1> >(mat, UpLo==Lower ? size-i : (i+1)) += alpha * cj(vec[i]) * ConjRhsType(OtherMap(vec+(UpLo==Lower ? i : 0), UpLo==Lower ? size-i : (i+1)));
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34 | //FIXME This should be handled outside.
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35 | mat[UpLo==Lower ? 0 : i] = numext::real(mat[UpLo==Lower ? 0 : i]);
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36 | mat += UpLo==Lower ? size-i : (i+1);
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37 | }
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38 | }
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39 | };
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40 |
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41 | template<typename Scalar, typename Index, int UpLo, bool ConjLhs, bool ConjRhs>
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42 | struct selfadjoint_packed_rank1_update<Scalar,Index,RowMajor,UpLo,ConjLhs,ConjRhs>
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43 | {
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44 | typedef typename NumTraits<Scalar>::Real RealScalar;
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45 | static void run(Index size, Scalar* mat, const Scalar* vec, RealScalar alpha)
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46 | {
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47 | selfadjoint_packed_rank1_update<Scalar,Index,ColMajor,UpLo==Lower?Upper:Lower,ConjRhs,ConjLhs>::run(size,mat,vec,alpha);
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48 | }
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49 | };
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50 |
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51 | } // end namespace internal
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52 |
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53 | #endif // EIGEN_SELFADJOINT_PACKED_PRODUCT_H
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