text: /*
   *   Copyright (c) 2010, Michael Lehn
   *
   *   All rights reserved.
   *
   *   Redistribution and use in source and binary forms, with or without
   *   modification, are permitted provided that the following conditions
   *   are met:
   *
   *   1) Redistributions of source code must retain the above copyright
   *      notice, this list of conditions and the following disclaimer.
   *   2) Redistributions in binary form must reproduce the above copyright
   *      notice, this list of conditions and the following disclaimer in
   *      the documentation and/or other materials provided with the
   *      distribution.
   *   3) Neither the name of the FLENS development group nor the names of
   *      its contributors may be used to endorse or promote products derived
   *      from this software without specific prior written permission.
   *
   *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef CXXBLAS_LEVEL1EXTENSIONS_TRAXPBY_TCC
  #define CXXBLAS_LEVEL1EXTENSIONS_TRAXPBY_TCC 1
  
  #include <algorithm>
  #include <cassert>
  #include <cxxblas/cxxblas.h>
  
  namespace cxxblas {
  
  //
  //  B = beta*B + alpha*op(A)
  //
  template <typename IndexType, typename ALPHA, typename MA,
            typename BETA, typename MB>
  void
  traxpby(StorageOrder order, StorageUpLo upLo, Transpose trans, Diag diag,
         IndexType m, IndexType n, const ALPHA &alpha, const MA *A, IndexType ldA,
         const BETA &beta, MB *B, IndexType ldB)
  {
      CXXBLAS_DEBUG_OUT("traxpby_generic");
      using std::min;
  
  
      if (order==RowMajor) {
          upLo  = (upLo==Upper) ? Lower : Upper;
          traxpby(ColMajor, upLo, trans, diag, n, m, alpha, A, ldA, beta, B, ldB);
          return;
      }
      if (diag==NonUnit) {
          if (trans==NoTrans) {
              if (upLo==Upper) {
                  for (IndexType j=0; j<n; ++j) {
                      axpby(min(j+1,m), alpha, A+j*ldA, IndexType(1),
                                        beta, B+j*ldB, IndexType(1));
                  }
              } else {
                  for (IndexType j=0; j<min(m,n); ++j) {
                      axpby(m-j, alpha, A+j*(ldA+1), IndexType(1),
                                 beta, B+j*(ldB+1), IndexType(1));
                  }
              }
          } else if (trans==Conj) {
              if (upLo==Upper) {
                  for (IndexType j=0; j<n; ++j) {
                      acxpby(min(j+1,m), alpha, A+j*ldA, IndexType(1),
                                         beta, B+j*ldB, IndexType(1));
                  }
              } else {
                  for (IndexType j=0; j<min(m,n); ++j) {
                      acxpby(m-j, alpha, A+j*(ldA+1), IndexType(1),
                                  beta, B+j*(ldB+1), IndexType(1));
                  }
              }
          } else if (trans==Trans) {
              if (upLo==Upper) {
                  for (IndexType j=0; j<n; ++j) {
                      axpby(min(j+1,m), alpha, A+j, ldA,
                                        beta, B+j*ldB, IndexType(1));
                  }
              } else {
                  for (IndexType j=0; j<min(m,n); ++j) {
                      axpby(m-j, alpha, A+j*(ldA+1), ldA,
                                 beta, B+j*(ldB+1), IndexType(1));
                  }
              }
          } else if (trans==ConjTrans) {
              if (upLo==Upper) {
                  for (IndexType j=0; j<n; ++j) {
                      acxpby(min(j+1,m), alpha, A+j, ldA,
                                         beta, B+j*ldB, IndexType(1));
                  }
              } else {
                  for (IndexType j=0; j<min(m,n); ++j) {
                      acxpby(m-j, alpha, A+j*(ldA+1), ldA,
                                  beta, B+j*(ldB+1), IndexType(1));
                  }
              }
          } else {
              // unknown trans
              ASSERT(0);
          }
      } else { // diag==Unit
  
          // Not possible
          ASSERT(0);
  
      }
  }
  
  } // namespace cxxblas
  
  #endif // CXXBLAS_LEVEL1EXTENSIONS_TRAXPBY_TCC
  