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// Ceres Solver - A fast non-linear least squares minimizer
// Copyright 2015 Google Inc. All rights reserved.
// http://ceres-solver.org/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. 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.
//
// Author: sameeragarwal@google.com (Sameer Agarwal)
#include "ceres/blas.h"
#include "ceres/internal/port.h"
#include "glog/logging.h"
#ifndef CERES_NO_LAPACK
extern "C" void dsyrk_(char* uplo,
char* trans,
int* n,
int* k,
double* alpha,
double* a,
int* lda,
double* beta,
double* c,
int* ldc);
#endif
namespace ceres {
namespace internal {
void BLAS::SymmetricRankKUpdate(int num_rows,
int num_cols,
const double* a,
bool transpose,
double alpha,
double beta,
double* c) {
#ifdef CERES_NO_LAPACK
LOG(FATAL) << "Ceres was built without a BLAS library.";
#else
char uplo = 'L';
char trans = transpose ? 'T' : 'N';
int n = transpose ? num_cols : num_rows;
int k = transpose ? num_rows : num_cols;
int lda = k;
int ldc = n;
dsyrk_(&uplo,
&trans,
&n,
&k,
&alpha,
const_cast<double*>(a),
&lda,
&beta,
c,
&ldc);
#endif
}
} // namespace internal
} // namespace ceres
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