Squashed 'third_party/eigen/' changes from 61d72f6..cf794d3
Change-Id: I9b814151b01f49af6337a8605d0c42a3a1ed4c72
git-subtree-dir: third_party/eigen
git-subtree-split: cf794d3b741a6278df169e58461f8529f43bce5d
diff --git a/Eigen/src/IterativeLinearSolvers/SolveWithGuess.h b/Eigen/src/IterativeLinearSolvers/SolveWithGuess.h
new file mode 100644
index 0000000..0ace451
--- /dev/null
+++ b/Eigen/src/IterativeLinearSolvers/SolveWithGuess.h
@@ -0,0 +1,115 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2014 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_SOLVEWITHGUESS_H
+#define EIGEN_SOLVEWITHGUESS_H
+
+namespace Eigen {
+
+template<typename Decomposition, typename RhsType, typename GuessType> class SolveWithGuess;
+
+/** \class SolveWithGuess
+ * \ingroup IterativeLinearSolvers_Module
+ *
+ * \brief Pseudo expression representing a solving operation
+ *
+ * \tparam Decomposition the type of the matrix or decomposion object
+ * \tparam Rhstype the type of the right-hand side
+ *
+ * This class represents an expression of A.solve(B)
+ * and most of the time this is the only way it is used.
+ *
+ */
+namespace internal {
+
+
+template<typename Decomposition, typename RhsType, typename GuessType>
+struct traits<SolveWithGuess<Decomposition, RhsType, GuessType> >
+ : traits<Solve<Decomposition,RhsType> >
+{};
+
+}
+
+
+template<typename Decomposition, typename RhsType, typename GuessType>
+class SolveWithGuess : public internal::generic_xpr_base<SolveWithGuess<Decomposition,RhsType,GuessType>, MatrixXpr, typename internal::traits<RhsType>::StorageKind>::type
+{
+public:
+ typedef typename internal::traits<SolveWithGuess>::Scalar Scalar;
+ typedef typename internal::traits<SolveWithGuess>::PlainObject PlainObject;
+ typedef typename internal::generic_xpr_base<SolveWithGuess<Decomposition,RhsType,GuessType>, MatrixXpr, typename internal::traits<RhsType>::StorageKind>::type Base;
+ typedef typename internal::ref_selector<SolveWithGuess>::type Nested;
+
+ SolveWithGuess(const Decomposition &dec, const RhsType &rhs, const GuessType &guess)
+ : m_dec(dec), m_rhs(rhs), m_guess(guess)
+ {}
+
+ EIGEN_DEVICE_FUNC Index rows() const { return m_dec.cols(); }
+ EIGEN_DEVICE_FUNC Index cols() const { return m_rhs.cols(); }
+
+ EIGEN_DEVICE_FUNC const Decomposition& dec() const { return m_dec; }
+ EIGEN_DEVICE_FUNC const RhsType& rhs() const { return m_rhs; }
+ EIGEN_DEVICE_FUNC const GuessType& guess() const { return m_guess; }
+
+protected:
+ const Decomposition &m_dec;
+ const RhsType &m_rhs;
+ const GuessType &m_guess;
+
+private:
+ Scalar coeff(Index row, Index col) const;
+ Scalar coeff(Index i) const;
+};
+
+namespace internal {
+
+// Evaluator of SolveWithGuess -> eval into a temporary
+template<typename Decomposition, typename RhsType, typename GuessType>
+struct evaluator<SolveWithGuess<Decomposition,RhsType, GuessType> >
+ : public evaluator<typename SolveWithGuess<Decomposition,RhsType,GuessType>::PlainObject>
+{
+ typedef SolveWithGuess<Decomposition,RhsType,GuessType> SolveType;
+ typedef typename SolveType::PlainObject PlainObject;
+ typedef evaluator<PlainObject> Base;
+
+ evaluator(const SolveType& solve)
+ : m_result(solve.rows(), solve.cols())
+ {
+ ::new (static_cast<Base*>(this)) Base(m_result);
+ m_result = solve.guess();
+ solve.dec()._solve_with_guess_impl(solve.rhs(), m_result);
+ }
+
+protected:
+ PlainObject m_result;
+};
+
+// Specialization for "dst = dec.solveWithGuess(rhs)"
+// NOTE we need to specialize it for Dense2Dense to avoid ambiguous specialization error and a Sparse2Sparse specialization must exist somewhere
+template<typename DstXprType, typename DecType, typename RhsType, typename GuessType, typename Scalar>
+struct Assignment<DstXprType, SolveWithGuess<DecType,RhsType,GuessType>, internal::assign_op<Scalar,Scalar>, Dense2Dense>
+{
+ typedef SolveWithGuess<DecType,RhsType,GuessType> SrcXprType;
+ static void run(DstXprType &dst, const SrcXprType &src, const internal::assign_op<Scalar,Scalar> &)
+ {
+ Index dstRows = src.rows();
+ Index dstCols = src.cols();
+ if((dst.rows()!=dstRows) || (dst.cols()!=dstCols))
+ dst.resize(dstRows, dstCols);
+
+ dst = src.guess();
+ src.dec()._solve_with_guess_impl(src.rhs(), dst/*, src.guess()*/);
+ }
+};
+
+} // end namepsace internal
+
+} // end namespace Eigen
+
+#endif // EIGEN_SOLVEWITHGUESS_H