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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 <cxxstd/cmath.h>
#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("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

}

} } // namespace lapack, flens

#endif // FLENS_LAPACK_LA_LABAD_TCC





































































































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