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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_gelqf_work( Params& params, bool run )
{
using real_t = blas::real_type< scalar_t >;
// get & mark input values
int64_t m = params.dim.m();
int64_t n = params.dim.n();
int64_t align = params.align();
params.matrix.mark();
real_t eps = std::numeric_limits< real_t >::epsilon();
real_t tol = params.tol() * eps;
// mark non-standard output values
params.ortho();
params.time();
params.gflops();
params.ref_time();
params.ref_gflops();
if (! run)
return;
// ---------- setup
int64_t lda = roundup( blas::max( 1, m ), align );
int64_t minmn = blas::min( m, n );
size_t size_A = (size_t)(lda * n);
size_t size_tau = (size_t)(blas::min(m,n));
std::vector< scalar_t > A_tst( size_A );
std::vector< scalar_t > A_ref( size_A );
std::vector< scalar_t > tau_tst( size_tau );
std::vector< scalar_t > tau_ref( size_tau );
lapack::generate_matrix( params.matrix, m, n, &A_tst[0], lda );
A_ref = A_tst;
// ---------- run test
testsweeper::flush_cache( params.cache() );
double time = testsweeper::get_wtime();
int64_t info_tst = lapack::gelqf( m, n, &A_tst[0], lda, &tau_tst[0] );
time = testsweeper::get_wtime() - time;
if (info_tst != 0) {
fprintf( stderr, "lapack::gelqf returned error %lld\n", llong( info_tst ) );
}
params.time() = time;
double gflop = lapack::Gflop< scalar_t >::gelqf( m, n );
params.gflops() = gflop / time;
if (params.check() == 'y') {
// ---------- check error
// comparing to ref. solution doesn't work
// Taken from lapack/TESTING/LIN/zlqt01.f but using smaller Q and L
int64_t ldq = minmn;
std::vector< scalar_t > Q( minmn * n );
int64_t ldl = m;
std::vector< scalar_t > L( m * minmn );
// Copy details of Q
real_t rogue = -10000000000; // -1D+10
lapack::laset( lapack::MatrixType::General, minmn, n, rogue, rogue, &Q[0], ldq );
if (n > 1)
lapack::lacpy( lapack::MatrixType::Upper, minmn, n, &A_tst[0], lda, &Q[0], ldq );
// Generate the m-by-m matrix Q
int64_t info_unglq = lapack::unglq( minmn, n, minmn, &Q[0], ldq, &tau_tst[0] );
if (info_unglq != 0) {
fprintf( stderr, "lapack::unglq returned error %lld\n", llong( info_unglq ) );
}
// Copy L
lapack::laset( lapack::MatrixType::Upper, m, minmn, 0.0, 0.0, &L[0], ldl );
lapack::lacpy( lapack::MatrixType::Lower, m, minmn, &A_tst[0], lda, &L[0], ldl );
// Compute L - A*Q'
blas::gemm( blas::Layout::ColMajor,
blas::Op::NoTrans, blas::Op::ConjTrans, m, minmn, n,
-1.0, &A_ref[0], lda, &Q[0], ldq, 1.0, &L[0], ldl );
// Compute norm( L - Q'*A ) / ( N * norm(A) * EPS ) .
real_t Anorm = lapack::lange( lapack::Norm::One, m, n, &A_ref[0], lda );
real_t resid1 = lapack::lange( lapack::Norm::One, m, minmn, &L[0], ldl );
real_t error1 = 0;
if (Anorm > 0)
error1 = ( resid1 / ( n * Anorm ) );
// Compute I - Q*Q'
lapack::laset( lapack::MatrixType::Upper, minmn, minmn, 0.0, 1.0, &L[0], ldl );
blas::herk( blas::Layout::ColMajor, blas::Uplo::Upper, blas::Op::NoTrans,
minmn, n, -1.0, &Q[0], ldq, 1.0, &L[0], ldl );
// Compute norm( I - Q*Q' ) / ( N * EPS ) .
real_t resid2 = lapack::lanhe( lapack::Norm::One, lapack::Uplo::Upper, minmn, &L[0], ldl );
real_t error2 = ( resid2 / n );
params.error() = error1;
params.ortho() = error2;
params.okay() = (error1 < tol) && (error2 < tol);
}
if (params.ref() == 'y') {
// ---------- run reference
testsweeper::flush_cache( params.cache() );
time = testsweeper::get_wtime();
int64_t info_ref = LAPACKE_gelqf( m, n, &A_ref[0], lda, &tau_ref[0] );
time = testsweeper::get_wtime() - time;
if (info_ref != 0) {
fprintf( stderr, "LAPACKE_gelqf returned error %lld\n", llong( info_ref ) );
}
params.ref_time() = time;
params.ref_gflops() = gflop / time;
}
}
// -----------------------------------------------------------------------------
void test_gelqf( Params& params, bool run )
{
switch (params.datatype()) {
case testsweeper::DataType::Single:
test_gelqf_work< float >( params, run );
break;
case testsweeper::DataType::Double:
test_gelqf_work< double >( params, run );
break;
case testsweeper::DataType::SingleComplex:
test_gelqf_work< std::complex<float> >( params, run );
break;
case testsweeper::DataType::DoubleComplex:
test_gelqf_work< std::complex<double> >( params, run );
break;
default:
throw std::runtime_error( "unknown datatype" );
break;
}
}
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