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/*
* Copyright (c) 2012, 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 FLENS_BLAS_CLOSURES_LEVEL2_MVSWITCH_TCC
#define FLENS_BLAS_CLOSURES_LEVEL2_MVSWITCH_TCC 1
#include <flens/auxiliary/auxiliary.h>
#include <flens/blas/closures/closures.h>
#include <flens/blas/level1/level1.h>
#include <flens/blas/level2/level2.h>
#include <flens/blas/level3/level3.h>
#include <flens/typedefs.h>
#ifdef FLENS_DEBUG_CLOSURES
# include <flens/blas/blaslogon.h>
#else
# include <flens/blas/blaslogoff.h>
#endif
namespace flens { namespace blas {
//
// This switch evaluates closures of the form
//
// y = beta*y + A*x
//
// If x is a closure then it gets evaluated and a temporary gets created to
// store the result. For matrix A we distinguish between three cases:
// case 1: A is no closure
// case 2: A is a scaling closure (i.e. scale*A)
// case 3: A is some other closure
//
// Entry point for mvSwitch
//
template <typename ALPHA, typename MA, typename VX, typename BETA, typename VY>
typename RestrictTo<IsSame<MA, typename MA::Impl>::value &&
IsSame<VX, typename VX::Impl>::value &&
IsSame<VY, typename VY::Impl>::value,
void>::Type
mvSwitch(Transpose trans, const ALPHA &alpha, const MA &A, const VX &x,
const BETA &beta, VY &y)
{
ASSERT(alpha==ALPHA(1) || alpha==ALPHA(-1));
//
// If A is a closure then prune arbitrary many OpTrans/OpConj
//
typedef typename PruneConjTrans<MA>::Remainder RMA;
trans = Transpose(trans^PruneConjTrans<MA>::trans);
const RMA &A_ = PruneConjTrans<MA>::remainder(A);
//
// If x is a closure it gets evaluated. In this case a temporary gets
// created. Otherwise we only keep a reference
//
FLENS_BLASLOG_TMP_TRON;
const typename Result<VX>::Type &x_ = x;
FLENS_BLASLOG_TMP_TROFF;
//
// Call mv implementation
//
mvCase(trans, alpha, A_, x_, beta, y);
//
// If a temporary was created and registered before we now unregister it
//
# ifdef FLENS_DEBUG_CLOSURES
if (!IsSame<VX, typename Result<VX>::Type>::value) {
FLENS_BLASLOG_TMP_REMOVE(x_, x);
}
# else
const bool check = IsSame<VX, typename Result<VX>::Type>::value;
if (!check) {
std::cerr << "ERROR: Temporary required." << std::endl;
}
ASSERT(check);
# endif
}
//
// case 1: A is no closure
//
template <typename ALPHA, typename MA, typename VX, typename BETA, typename VY>
typename RestrictTo<!IsClosure<MA>::value,
void>::Type
mvCase(Transpose trans, const ALPHA &alpha, const MA &A, const VX &x,
const BETA &beta, VY &y)
{
mv(trans, alpha, A, x, beta, y);
}
//
// case 2: A is closure of type scale*A
//
template <typename ALPHA, typename T, typename MA, typename VX, typename BETA,
typename VY>
void
mvCase(Transpose trans, const ALPHA &alpha,
const MatrixClosure<OpMult, ScalarValue<T>, MA> &scale_A,
const VX &x, const BETA &beta, VY &y)
{
//
// If A is a closure then prune arbitrary many OpTrans/OpConj
//
typedef typename PruneConjTrans<MA>::Remainder MA_;
typedef typename Result<MA_>::Type RMA;
Transpose trans_ = Transpose(trans^PruneConjTrans<MA>::trans);
//
// If the remaining A is a closure it gets evaluated. In this case
// a temporary gets created. Otherwise we only keep a reference
//
FLENS_BLASLOG_TMP_TRON;
const MA_ &A_ = PruneConjTrans<MA>::remainder(scale_A.right());
const RMA &A = A_;
FLENS_BLASLOG_TMP_TROFF;
mv(trans_, alpha*scale_A.left().value(), A, x, beta, y);
//
// If a temporary was created and registered before we now unregister it
//
# ifdef FLENS_DEBUG_CLOSURES
if (!IsSame<MA_, RMA>::value) {
FLENS_BLASLOG_TMP_REMOVE(A, A_);
}
# else
const bool check = IsSame<MA_, RMA>::value;
if (!check) {
std::cerr << "ERROR: Temporary required." << std::endl;
}
ASSERT(check);
# endif
}
//
// case 3: A is some other closure
//
template <typename ALPHA, typename Op, typename L, typename R, typename VX,
typename BETA, typename VY>
void
mvCase(Transpose trans, const ALPHA &alpha, const MatrixClosure<Op, L, R> &A,
const VX &x, const BETA &beta, VY &y)
{
typedef MatrixClosure<Op, L, R> MC;
//
// Create (most certainly) temporary for the result of A
//
FLENS_BLASLOG_TMP_TRON;
typedef typename Result<MC>::Type MA;
const MA &A_ = A;
FLENS_BLASLOG_TMP_TROFF;
mv(trans, alpha, A_, x, beta, y);
//
// If a temporary was created and registered before we now unregister it
//
# ifdef FLENS_DEBUG_CLOSURES
if (!IsSame<MC, MA>::value) {
FLENS_BLASLOG_TMP_REMOVE(A_, A);
}
# else
const bool check = IsSame<MC, MA>::value;
if (!check) {
std::cerr << "ERROR: Temporary required." << std::endl;
}
ASSERT(check);
# endif
}
} } // namespace blas, flens
#endif // FLENS_BLAS_CLOSURES_LEVEL2_MVSWITCH_TCC
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