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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 "print_matrix.hh"
#include "error.hh"
#include "lapacke_wrappers.hh"
#include <vector>
// -----------------------------------------------------------------------------
template< typename scalar_t >
void test_laed4_work( Params& params, bool run )
{
using real_t = blas::real_type< scalar_t >;
// get & mark input values
int64_t n = params.dim.n();
int64_t i = params.i();
real_t rho = std::abs( params.alpha.get<real_t>() );
assert( 0 <= i && i < n ); // 0-based
// mark non-standard output values
params.ref_time();
if (! run)
return;
// ---------- setup
scalar_t lambda_tst;
scalar_t lambda_ref;
std::vector< scalar_t > d( n );
std::vector< scalar_t > z( n );
std::vector< scalar_t > delta_tst( n );
std::vector< scalar_t > delta_ref( n );
int64_t idist = 1;
int64_t iseed[4] = { 0, 1, 2, 3 };
lapack::larnv( idist, iseed, d.size(), &d[0] );
lapack::larnv( idist, iseed, z.size(), &z[0] );
// sort d.
std::sort( d.begin(), d.end() );
// z should have unit norm.
real_t z_norm = blas::nrm2( n, &z[0], 1 );
for (int64_t i = 0; i < n; ++i)
z[ i ] /= z_norm;
// ---------- run test
testsweeper::flush_cache( params.cache() );
double time = testsweeper::get_wtime();
int64_t info_tst = lapack::laed4( n, i, &d[0], &z[0],
&delta_tst[0], rho, &lambda_tst );
time = testsweeper::get_wtime() - time;
if (info_tst != 0) {
fprintf( stderr, "lapack::laed4 returned error %lld\n", llong( info_tst ) );
}
params.time() = time;
if (params.ref() == 'y' || params.check() == 'y') {
// ---------- run reference
testsweeper::flush_cache( params.cache() );
time = testsweeper::get_wtime();
int64_t info_ref = LAPACKE_laed4( n, i, &d[0], &z[0],
&delta_ref[0], rho, &lambda_ref );
time = testsweeper::get_wtime() - time;
if (info_ref != 0) {
fprintf( stderr, "LAPACKE_laed4 returned error %lld\n", llong( info_ref ) );
}
params.ref_time() = time;
// ---------- check error compared to reference
real_t error = 0;
if (info_tst != info_ref) {
error = 1;
}
error += abs_error( delta_tst, delta_ref );
error += std::abs( lambda_tst - lambda_ref );
params.error() = error;
params.okay() = (error == 0); // expect lapackpp == lapacke
}
}
// -----------------------------------------------------------------------------
void test_laed4( Params& params, bool run )
{
switch (params.datatype()) {
case testsweeper::DataType::Single:
test_laed4_work< float >( params, run );
break;
case testsweeper::DataType::Double:
test_laed4_work< double >( params, run );
break;
case testsweeper::DataType::SingleComplex:
case testsweeper::DataType::DoubleComplex:
params.msg() = "skipping: no complex version";
break;
default:
throw std::runtime_error( "unknown datatype" );
break;
}
}
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