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// Copyright (c) 2017-2023, University of Tennessee. All rights reserved.
// SPDX-License-Identifier: BSD-3-Clause
// This program is free software: you can redistribute it and/or modify it under
// the terms of the BSD 3-Clause license. See the accompanying LICENSE file.
#include "test.hh"
#include "lapack.hh"
#include "lapack/flops.hh"
#include "print_matrix.hh"
#include "error.hh"
#include "lapacke_wrappers.hh"
#include <vector>
//------------------------------------------------------------------------------
template< typename scalar_t >
void test_lae2_work( Params& params, bool run )
{
using real_t = blas::real_type< scalar_t >;
using blas::conj;
using lapack::Job, lapack::Uplo;
// Constants
const real_t eps = std::numeric_limits< real_t >::epsilon();
// get & mark input values
params.dim.m() = 2;
params.dim.n() = 2;
real_t tol = params.tol() * eps;
int verbose = params.verbose();
params.matrix.mark();
// mark non-standard output values
params.error.name( "Lambda" );
if (! run)
return;
//---------- setup
int64_t n = 2;
int64_t lda = 2;
std::vector< scalar_t > A( lda*n );
lapack::generate_matrix( params.matrix, n, n, &A[0], lda );
// A = [ a b ], stored column-wise.
// [ conj(b) c ]
scalar_t a = A[ 0 ];
scalar_t b = A[ 2 ];
scalar_t c = A[ 3 ];
A[ 1 ] = conj( b );
real_t rt1, rt2, rt1_ref, rt2_ref, cs1;
scalar_t sn1;
if (verbose >= 2) {
printf( "A = " ); print_matrix( n, n, &A[0], lda );
}
//---------- run test
testsweeper::flush_cache( params.cache() );
double time = testsweeper::get_wtime();
// no info returned
lapack::lae2( a, b, c, &rt1, &rt2 );
time = testsweeper::get_wtime() - time;
params.time() = time;
std::vector< real_t > Lambda{ rt1, rt2 };
if (verbose >= 2) {
printf( "Lambda = " ); print_vector( n, &Lambda[0], 1 );
}
if (params.check() == 'y') {
//---------- run reference, using laev2
testsweeper::flush_cache( params.cache() );
time = testsweeper::get_wtime();
lapack::laev2( a, b, c, &rt1_ref, &rt2_ref, &cs1, &sn1 );
time = testsweeper::get_wtime() - time;
params.ref_time() = time;
//---------- check error compared to reference
std::vector< real_t > Lambda_ref{ rt1_ref, rt2_ref };
real_t error = rel_error( Lambda, Lambda_ref );
params.error() = error;
params.okay() = (error < tol);
}
}
//------------------------------------------------------------------------------
void test_lae2( Params& params, bool run )
{
switch (params.datatype()) {
case testsweeper::DataType::Single:
test_lae2_work< float >( params, run );
break;
case testsweeper::DataType::Double:
test_lae2_work< double >( params, run );
break;
default:
throw std::runtime_error( "unknown datatype" );
break;
}
}
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