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tvmet/xpr/MVProduct.h@41:fefdbb9b5968, 2013-04-11 (annotated)

Committer:
rsavitski
Date:
Thu Apr 11 18:49:11 2013 +0000
Revision:
41:fefdbb9b5968
Parent:
15:9c5aaeda36dc 
hysteresis

Who changed what in which revision?

UserRevisionLine numberNew contents of line
madcowswe 15:9c5aaeda36dc 1 /*
madcowswe 15:9c5aaeda36dc 2 * Tiny Vector Matrix Library
madcowswe 15:9c5aaeda36dc 3 * Dense Vector Matrix Libary of Tiny size using Expression Templates
madcowswe 15:9c5aaeda36dc 4 *
madcowswe 15:9c5aaeda36dc 5 * Copyright (C) 2001 - 2007 Olaf Petzold <opetzold@users.sourceforge.net>
madcowswe 15:9c5aaeda36dc 6 *
madcowswe 15:9c5aaeda36dc 7 * This library is free software; you can redistribute it and/or
madcowswe 15:9c5aaeda36dc 8 * modify it under the terms of the GNU Lesser General Public
madcowswe 15:9c5aaeda36dc 9 * License as published by the Free Software Foundation; either
madcowswe 15:9c5aaeda36dc 10 * version 2.1 of the License, or (at your option) any later version.
madcowswe 15:9c5aaeda36dc 11 *
madcowswe 15:9c5aaeda36dc 12 * This library is distributed in the hope that it will be useful,
madcowswe 15:9c5aaeda36dc 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
madcowswe 15:9c5aaeda36dc 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
madcowswe 15:9c5aaeda36dc 15 * Lesser General Public License for more details.
madcowswe 15:9c5aaeda36dc 16 *
madcowswe 15:9c5aaeda36dc 17 * You should have received a copy of the GNU Lesser General Public
madcowswe 15:9c5aaeda36dc 18 * License along with this library; if not, write to the Free Software
madcowswe 15:9c5aaeda36dc 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
madcowswe 15:9c5aaeda36dc 20 *
madcowswe 15:9c5aaeda36dc 21 * $Id: MVProduct.h,v 1.21 2007-06-23 15:59:00 opetzold Exp $
madcowswe 15:9c5aaeda36dc 22 */
madcowswe 15:9c5aaeda36dc 23
madcowswe 15:9c5aaeda36dc 24 #ifndef TVMET_XPR_MVPRODUCT_H
madcowswe 15:9c5aaeda36dc 25 #define TVMET_XPR_MVPRODUCT_H
madcowswe 15:9c5aaeda36dc 26
madcowswe 15:9c5aaeda36dc 27 #include <tvmet/meta/Gemv.h>
madcowswe 15:9c5aaeda36dc 28 #include <tvmet/loop/Gemv.h>
madcowswe 15:9c5aaeda36dc 29
madcowswe 15:9c5aaeda36dc 30 namespace tvmet {
madcowswe 15:9c5aaeda36dc 31
madcowswe 15:9c5aaeda36dc 32
madcowswe 15:9c5aaeda36dc 33 /**
madcowswe 15:9c5aaeda36dc 34 * \class XprMVProduct MVProduct.h "tvmet/xpr/MVProduct.h"
madcowswe 15:9c5aaeda36dc 35 * \brief Expression for matrix-vector product
madcowswe 15:9c5aaeda36dc 36 * using formula
madcowswe 15:9c5aaeda36dc 37 * \f[
madcowswe 15:9c5aaeda36dc 38 * M\,v
madcowswe 15:9c5aaeda36dc 39 * \f]
madcowswe 15:9c5aaeda36dc 40 */
madcowswe 15:9c5aaeda36dc 41 template<class E1, std::size_t Rows, std::size_t Cols,
madcowswe 15:9c5aaeda36dc 42 class E2>
madcowswe 15:9c5aaeda36dc 43 class XprMVProduct
madcowswe 15:9c5aaeda36dc 44 : public TvmetBase< XprMVProduct<E1, Rows, Cols, E2> >
madcowswe 15:9c5aaeda36dc 45 {
madcowswe 15:9c5aaeda36dc 46 XprMVProduct();
madcowswe 15:9c5aaeda36dc 47 XprMVProduct& operator=(const XprMVProduct&);
madcowswe 15:9c5aaeda36dc 48
madcowswe 15:9c5aaeda36dc 49 public:
madcowswe 15:9c5aaeda36dc 50 typedef typename PromoteTraits<
madcowswe 15:9c5aaeda36dc 51 typename E1::value_type,
madcowswe 15:9c5aaeda36dc 52 typename E2::value_type
madcowswe 15:9c5aaeda36dc 53 >::value_type value_type;
madcowswe 15:9c5aaeda36dc 54
madcowswe 15:9c5aaeda36dc 55 public:
madcowswe 15:9c5aaeda36dc 56 /** Complexity counter. */
madcowswe 15:9c5aaeda36dc 57 enum {
madcowswe 15:9c5aaeda36dc 58 ops_lhs = E1::ops,
madcowswe 15:9c5aaeda36dc 59 ops_rhs = E2::ops,
madcowswe 15:9c5aaeda36dc 60 M = Rows * Cols,
madcowswe 15:9c5aaeda36dc 61 N = Rows * (Cols - 1),
madcowswe 15:9c5aaeda36dc 62 ops_plus = M * NumericTraits<value_type>::ops_plus,
madcowswe 15:9c5aaeda36dc 63 ops_muls = N * NumericTraits<value_type>::ops_muls,
madcowswe 15:9c5aaeda36dc 64 ops = ops_plus + ops_muls,
madcowswe 15:9c5aaeda36dc 65 use_meta = Rows*Cols < TVMET_COMPLEXITY_MV_TRIGGER ? true : false
madcowswe 15:9c5aaeda36dc 66 };
madcowswe 15:9c5aaeda36dc 67
madcowswe 15:9c5aaeda36dc 68 public:
madcowswe 15:9c5aaeda36dc 69 /** Constructor. */
madcowswe 15:9c5aaeda36dc 70 explicit XprMVProduct(const E1& lhs, const E2& rhs)
madcowswe 15:9c5aaeda36dc 71 : m_lhs(lhs), m_rhs(rhs)
madcowswe 15:9c5aaeda36dc 72 { }
madcowswe 15:9c5aaeda36dc 73
madcowswe 15:9c5aaeda36dc 74 /** Copy Constructor. Not explicit! */
madcowswe 15:9c5aaeda36dc 75 #if defined(TVMET_OPTIMIZE_XPR_MANUAL_CCTOR)
madcowswe 15:9c5aaeda36dc 76 XprMVProduct(const XprMVProduct& e)
madcowswe 15:9c5aaeda36dc 77 : m_lhs(e.m_lhs), m_rhs(e.m_rhs)
madcowswe 15:9c5aaeda36dc 78 { }
madcowswe 15:9c5aaeda36dc 79 #endif
madcowswe 15:9c5aaeda36dc 80
madcowswe 15:9c5aaeda36dc 81 private:
madcowswe 15:9c5aaeda36dc 82 /** Wrapper for meta gemm. */
madcowswe 15:9c5aaeda36dc 83 static inline
madcowswe 15:9c5aaeda36dc 84 value_type do_gemv(dispatch<true>, const E1& lhs, const E2& rhs, std::size_t j) {
madcowswe 15:9c5aaeda36dc 85 return meta::gemv<Rows, Cols,
madcowswe 15:9c5aaeda36dc 86 0>::prod(lhs, rhs, j);
madcowswe 15:9c5aaeda36dc 87 }
madcowswe 15:9c5aaeda36dc 88
madcowswe 15:9c5aaeda36dc 89 /** Wrapper for loop gemm. */
madcowswe 15:9c5aaeda36dc 90 static inline
madcowswe 15:9c5aaeda36dc 91 value_type do_gemv(dispatch<false>, const E1& lhs, const E2& rhs, std::size_t j) {
madcowswe 15:9c5aaeda36dc 92 return loop::gemv<Rows, Cols>::prod(lhs, rhs, j);
madcowswe 15:9c5aaeda36dc 93 }
madcowswe 15:9c5aaeda36dc 94
madcowswe 15:9c5aaeda36dc 95 public:
madcowswe 15:9c5aaeda36dc 96 /** index operator, returns the expression by index. This is the vector
madcowswe 15:9c5aaeda36dc 97 style since a matrix*vector gives a vector. */
madcowswe 15:9c5aaeda36dc 98 value_type operator()(std::size_t j) const {
madcowswe 15:9c5aaeda36dc 99 TVMET_RT_CONDITION(j < Rows , "XprMVProduct Bounce Violation")
madcowswe 15:9c5aaeda36dc 100 return do_gemv(dispatch<use_meta>(), m_lhs, m_rhs, j);
madcowswe 15:9c5aaeda36dc 101 }
madcowswe 15:9c5aaeda36dc 102
madcowswe 15:9c5aaeda36dc 103 public: // debugging Xpr parse tree
madcowswe 15:9c5aaeda36dc 104 void print_xpr(std::ostream& os, std::size_t l=0) const {
madcowswe 15:9c5aaeda36dc 105 os << IndentLevel(l++)
madcowswe 15:9c5aaeda36dc 106 << "XprMVProduct["
madcowswe 15:9c5aaeda36dc 107 << (use_meta ? "M" : "L") << ", O=" << ops
madcowswe 15:9c5aaeda36dc 108 << ", (O1=" << ops_lhs << ", O2=" << ops_rhs << ")]<"
madcowswe 15:9c5aaeda36dc 109 << std::endl;
madcowswe 15:9c5aaeda36dc 110 m_lhs.print_xpr(os, l);
madcowswe 15:9c5aaeda36dc 111 os << IndentLevel(l)
madcowswe 15:9c5aaeda36dc 112 << "R=" << Rows << ", C=" << Cols << ",\n";
madcowswe 15:9c5aaeda36dc 113 m_rhs.print_xpr(os, l);
madcowswe 15:9c5aaeda36dc 114 os << IndentLevel(--l)
madcowswe 15:9c5aaeda36dc 115 << ">," << std::endl;
madcowswe 15:9c5aaeda36dc 116 }
madcowswe 15:9c5aaeda36dc 117
madcowswe 15:9c5aaeda36dc 118 private:
madcowswe 15:9c5aaeda36dc 119 const E1 m_lhs;
madcowswe 15:9c5aaeda36dc 120 const E2 m_rhs;
madcowswe 15:9c5aaeda36dc 121 };
madcowswe 15:9c5aaeda36dc 122
madcowswe 15:9c5aaeda36dc 123
madcowswe 15:9c5aaeda36dc 124 } // namespace tvmet
madcowswe 15:9c5aaeda36dc 125
madcowswe 15:9c5aaeda36dc 126 #endif // TVMET_XPR_MVPRODUCT_H
madcowswe 15:9c5aaeda36dc 127
madcowswe 15:9c5aaeda36dc 128 // Local Variables:
madcowswe 15:9c5aaeda36dc 129 // mode:C++
madcowswe 15:9c5aaeda36dc 130 // tab-width:8
madcowswe 15:9c5aaeda36dc 131 // End: