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/*
* Copyright (c) 2011, 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. */ /* Based on SUBROUTINE DLABAD( SMALL, LARGE ) * * -- LAPACK auxiliary routine (version 3.2) -- * -- LAPACK is a software package provided by Univ. of Tennessee, -- * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- * November 2006 */ #ifndef FLENS_LAPACK_LA_LABAD_TCC #define FLENS_LAPACK_LA_LABAD_TCC 1 #include <cmath> #include <flens/lapack/lapack.h> namespace flens { namespace lapack { //== generic lapack implementation ============================================= namespace generic { template <typename T> void labad_impl(T &small, T &large) { if (!IsSame<T, double>::value) { return; } // // If it looks like we're on a Cray, take the square root of // SMALL and LARGE to avoid overflow and underflow problems. // if (log10(large)>2000) { small = sqrt(small); large = sqrt(large); } } } // namespace generic //== interface for native lapack =============================================== #ifdef USE_CXXLAPACK namespace external { template <typename T> void labad_impl(T &small, T &large) { cxxlapack::labad(small, large); } } // namespace external #endif // USE_CXXLAPACK //== public interface ========================================================== template <typename T> void labad(T &small, T &large) { LAPACK_DEBUG_OUT("BEGIN: labad"); # ifdef CHECK_CXXLAPACK // // Make copies of output arguments // T _small = small; T _large = large; # endif // // Call implementation // LAPACK_SELECT::labad_impl(small, large); # ifdef CHECK_CXXLAPACK // // Compare results // external::labad_impl(_small, _large); bool failed = false; if (! isIdentical(small, _small, " small", "_small")) { std::cerr << "CXXLAPACK: small = " << small << std::endl; std::cerr << "F77LAPACK: _small = " << _small << std::endl; failed = true; } if (! isIdentical(large, _large, " large", "_large")) { std::cerr << "CXXLAPACK: large = " << large << std::endl; std::cerr << "F77LAPACK: _large = " << _large << std::endl; failed = true; } if (failed) { ASSERT(0); } # endif LAPACK_DEBUG_OUT("END: labad"); } } } // namespace lapack, flens #endif // FLENS_LAPACK_LA_LABAD_TCC |