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tvmet/meta/Gemm.h@25:143b19c1fb05, 2012-10-17 (annotated)

Committer:
narshu
Date:
Wed Oct 17 22:22:28 2012 +0000
Revision:
25:143b19c1fb05
Commit before publishing;

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narshu 25:143b19c1fb05 1 /*
narshu 25:143b19c1fb05 2 * Tiny Vector Matrix Library
narshu 25:143b19c1fb05 3 * Dense Vector Matrix Libary of Tiny size using Expression Templates
narshu 25:143b19c1fb05 4 *
narshu 25:143b19c1fb05 5 * Copyright (C) 2001 - 2007 Olaf Petzold <opetzold@users.sourceforge.net>
narshu 25:143b19c1fb05 6 *
narshu 25:143b19c1fb05 7 * This library is free software; you can redistribute it and/or
narshu 25:143b19c1fb05 8 * modify it under the terms of the GNU Lesser General Public
narshu 25:143b19c1fb05 9 * License as published by the Free Software Foundation; either
narshu 25:143b19c1fb05 10 * version 2.1 of the License, or (at your option) any later version.
narshu 25:143b19c1fb05 11 *
narshu 25:143b19c1fb05 12 * This library is distributed in the hope that it will be useful,
narshu 25:143b19c1fb05 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
narshu 25:143b19c1fb05 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
narshu 25:143b19c1fb05 15 * Lesser General Public License for more details.
narshu 25:143b19c1fb05 16 *
narshu 25:143b19c1fb05 17 * You should have received a copy of the GNU Lesser General Public
narshu 25:143b19c1fb05 18 * License along with this library; if not, write to the Free Software
narshu 25:143b19c1fb05 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
narshu 25:143b19c1fb05 20 *
narshu 25:143b19c1fb05 21 * $Id: Gemm.h,v 1.15 2007-06-23 15:58:59 opetzold Exp $
narshu 25:143b19c1fb05 22 */
narshu 25:143b19c1fb05 23
narshu 25:143b19c1fb05 24 #ifndef TVMET_META_GEMM_H
narshu 25:143b19c1fb05 25 #define TVMET_META_GEMM_H
narshu 25:143b19c1fb05 26
narshu 25:143b19c1fb05 27 #include <tvmet/xpr/Null.h>
narshu 25:143b19c1fb05 28
narshu 25:143b19c1fb05 29 namespace tvmet {
narshu 25:143b19c1fb05 30
narshu 25:143b19c1fb05 31 namespace meta {
narshu 25:143b19c1fb05 32
narshu 25:143b19c1fb05 33
narshu 25:143b19c1fb05 34 /**
narshu 25:143b19c1fb05 35 * \class gemm Gemm.h "tvmet/meta/Gemm.h"
narshu 25:143b19c1fb05 36 * \brief Meta class for matrix-matrix operations, like product
narshu 25:143b19c1fb05 37 * using formula
narshu 25:143b19c1fb05 38 * \f[
narshu 25:143b19c1fb05 39 * M_1\,M_2
narshu 25:143b19c1fb05 40 * \f]
narshu 25:143b19c1fb05 41 * \note The rows of matrix 2 have to be equal to cols of matrix 1.
narshu 25:143b19c1fb05 42 */
narshu 25:143b19c1fb05 43 template<std::size_t Rows1, std::size_t Cols1,
narshu 25:143b19c1fb05 44 std::size_t Cols2,
narshu 25:143b19c1fb05 45 std::size_t K>
narshu 25:143b19c1fb05 46 class gemm
narshu 25:143b19c1fb05 47 {
narshu 25:143b19c1fb05 48 gemm();
narshu 25:143b19c1fb05 49 gemm(const gemm&);
narshu 25:143b19c1fb05 50 gemm& operator=(const gemm&);
narshu 25:143b19c1fb05 51
narshu 25:143b19c1fb05 52 private:
narshu 25:143b19c1fb05 53 enum {
narshu 25:143b19c1fb05 54 doIt = (K != Cols1 - 1) /**< recursive counter */
narshu 25:143b19c1fb05 55 };
narshu 25:143b19c1fb05 56
narshu 25:143b19c1fb05 57 public:
narshu 25:143b19c1fb05 58 template<class E1, class E2>
narshu 25:143b19c1fb05 59 static inline
narshu 25:143b19c1fb05 60 typename PromoteTraits<
narshu 25:143b19c1fb05 61 typename E1::value_type,
narshu 25:143b19c1fb05 62 typename E2::value_type
narshu 25:143b19c1fb05 63 >::value_type
narshu 25:143b19c1fb05 64 prod(const E1& lhs, const E2& rhs, std::size_t i, std::size_t j) {
narshu 25:143b19c1fb05 65 return lhs(i, K) * rhs(K, j)
narshu 25:143b19c1fb05 66 + gemm<Rows1 * doIt, Cols1 * doIt,
narshu 25:143b19c1fb05 67 Cols2 * doIt,
narshu 25:143b19c1fb05 68 (K+1) * doIt>::prod(lhs, rhs, i, j);
narshu 25:143b19c1fb05 69 }
narshu 25:143b19c1fb05 70 };
narshu 25:143b19c1fb05 71
narshu 25:143b19c1fb05 72
narshu 25:143b19c1fb05 73 /**
narshu 25:143b19c1fb05 74 * \class gemm<0,0,0,0> Gemm.h "tvmet/meta/Gemm.h"
narshu 25:143b19c1fb05 75 * \brief gemm Specialized for recursion.
narshu 25:143b19c1fb05 76 */
narshu 25:143b19c1fb05 77 template<>
narshu 25:143b19c1fb05 78 class gemm<0,0,0,0>
narshu 25:143b19c1fb05 79 {
narshu 25:143b19c1fb05 80 gemm();
narshu 25:143b19c1fb05 81 gemm(const gemm&);
narshu 25:143b19c1fb05 82 gemm& operator=(const gemm&);
narshu 25:143b19c1fb05 83
narshu 25:143b19c1fb05 84 public:
narshu 25:143b19c1fb05 85 template<class E1, class E2>
narshu 25:143b19c1fb05 86 static inline
narshu 25:143b19c1fb05 87 XprNull prod(const E1&, const E2&, std::size_t, std::size_t) {
narshu 25:143b19c1fb05 88 return XprNull();
narshu 25:143b19c1fb05 89 }
narshu 25:143b19c1fb05 90 };
narshu 25:143b19c1fb05 91
narshu 25:143b19c1fb05 92
narshu 25:143b19c1fb05 93 } // namespace meta
narshu 25:143b19c1fb05 94
narshu 25:143b19c1fb05 95 } // namespace tvmet
narshu 25:143b19c1fb05 96
narshu 25:143b19c1fb05 97 #endif /* TVMET_META_GEMM_H */
narshu 25:143b19c1fb05 98
narshu 25:143b19c1fb05 99 // Local Variables:
narshu 25:143b19c1fb05 100 // mode:C++
narshu 25:143b19c1fb05 101 // tab-width:8
narshu 25:143b19c1fb05 102 // End: