Diff: tvmet/xpr/MVProduct.h

Revision:

15:9c5aaeda36dc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tvmet/xpr/MVProduct.h	Sat Apr 06 20:57:54 2013 +0000
@@ -0,0 +1,131 @@
+/*
+ * Tiny Vector Matrix Library
+ * Dense Vector Matrix Libary of Tiny size using Expression Templates
+ *
+ * Copyright (C) 2001 - 2007 Olaf Petzold <opetzold@users.sourceforge.net>
+ *
+ * This library is free software; you can redistribute 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 distributed 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * $Id: MVProduct.h,v 1.21 2007-06-23 15:59:00 opetzold Exp $
+ */
+
+#ifndef TVMET_XPR_MVPRODUCT_H
+#define TVMET_XPR_MVPRODUCT_H
+
+#include <tvmet/meta/Gemv.h>
+#include <tvmet/loop/Gemv.h>
+
+namespace tvmet {
+
+
+/**
+ * \class XprMVProduct MVProduct.h "tvmet/xpr/MVProduct.h"
+ * \brief Expression for matrix-vector product
+ *        using formula
+ *        \f[
+ *        M\,v
+ *        \f]
+ */
+template<class E1, std::size_t Rows, std::size_t Cols,
+     class E2>
+class XprMVProduct
+  : public TvmetBase< XprMVProduct<E1, Rows, Cols, E2> >
+{
+  XprMVProduct();
+  XprMVProduct& operator=(const XprMVProduct&);
+
+public:
+  typedef typename PromoteTraits<
+    typename E1::value_type,
+    typename E2::value_type
+  >::value_type                            value_type;
+
+public:
+  /** Complexity counter. */
+  enum {
+    ops_lhs   = E1::ops,
+    ops_rhs   = E2::ops,
+    M         = Rows * Cols,
+    N         = Rows * (Cols - 1),
+    ops_plus  = M * NumericTraits<value_type>::ops_plus,
+    ops_muls  = N * NumericTraits<value_type>::ops_muls,
+    ops       = ops_plus + ops_muls,
+    use_meta  = Rows*Cols < TVMET_COMPLEXITY_MV_TRIGGER ? true : false
+  };
+
+public:
+  /** Constructor. */
+  explicit XprMVProduct(const E1& lhs, const E2& rhs)
+    : m_lhs(lhs), m_rhs(rhs)
+  { }
+
+  /** Copy Constructor. Not explicit! */
+#if defined(TVMET_OPTIMIZE_XPR_MANUAL_CCTOR)
+  XprMVProduct(const XprMVProduct& e)
+    : m_lhs(e.m_lhs), m_rhs(e.m_rhs)
+  { }
+#endif
+
+private:
+  /** Wrapper for meta gemm. */
+  static inline
+  value_type do_gemv(dispatch<true>, const E1& lhs, const E2& rhs, std::size_t j) {
+    return meta::gemv<Rows, Cols,
+                      0>::prod(lhs, rhs, j);
+  }
+
+  /** Wrapper for loop gemm. */
+  static inline
+  value_type do_gemv(dispatch<false>, const E1& lhs, const E2& rhs, std::size_t j) {
+    return loop::gemv<Rows, Cols>::prod(lhs, rhs, j);
+  }
+
+public:
+  /** index operator, returns the expression by index. This is the vector
+      style since a matrix*vector gives a vector. */
+  value_type operator()(std::size_t j) const {
+    TVMET_RT_CONDITION(j < Rows , "XprMVProduct Bounce Violation")
+    return do_gemv(dispatch<use_meta>(), m_lhs, m_rhs, j);
+  }
+
+public: // debugging Xpr parse tree
+  void print_xpr(std::ostream& os, std::size_t l=0) const {
+    os << IndentLevel(l++)
+       << "XprMVProduct["
+       << (use_meta ? "M" :  "L") << ", O=" << ops
+       << ", (O1=" << ops_lhs << ", O2=" << ops_rhs << ")]<"
+       << std::endl;
+    m_lhs.print_xpr(os, l);
+    os << IndentLevel(l)
+       << "R=" << Rows << ", C=" << Cols << ",\n";
+    m_rhs.print_xpr(os, l);
+    os << IndentLevel(--l)
+       << ">," << std::endl;
+  }
+
+private:
+  const E1                            m_lhs;
+  const E2                            m_rhs;
+};
+
+
+} // namespace tvmet
+
+#endif // TVMET_XPR_MVPRODUCT_H
+
+// Local Variables:
+// mode:C++
+// tab-width:8
+// End: