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ilaenv.tcc
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ilaenv.tcc
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/*
* Copyright (c) 2011, 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.
*/
/* Based on
*
* INTEGER FUNCTION ILAENV( ISPEC, NAME, OPTS, N1, N2, N3, N4 )
*
* http://www.netlib.org/lapack/util/ilaenv.f
*
* -- LAPACK auxiliary routine (version 3.2.1) --
*
* -- April 2009 --
*
* -- LAPACK is a software package provided by Univ. of Tennessee, --
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*
*/
#ifndef FLENS_LAPACK_LA_ILAENV_TCC
#define FLENS_LAPACK_LA_ILAENV_TCC 1
#include <cxxstd/complex.h>
#include <cxxstd/cstring.h>
#include <flens/auxiliary/auxiliary.h>
#include <flens/lapack/lapack.h>
namespace flens { namespace lapack {
//== generic lapack implementation =============================================
template <int n>
bool
isSame(const char *a, const char *b)
{
for (int i=0; i<n; ++i) {
if (a[i]!=b[i]) {
return false;
}
}
return true;
}
namespace generic {
template <typename T>
int
ilaenv_impl(int spec, const char *name, const char *opts,
int n1, int n2, int n3, int n4)
{
int result = -1;
const char *c2 = name;
const char *c3 = name + 2;
const char *c4 = name + 3;
int nb, nbMin, nx;
switch (spec) {
//
// optimal blocksize
//
case 1:
nb = 32;
if (isSame<2>(c2, "GE")) {
if (isSame<3>(c3, "TRF")) {
if (IsNotComplex<T>::value) {
nb = 64;
} else {
nb = 64;
}
} else if (isSame<3>(c3, "QRF") || isSame<3>(c3, "RQF")
|| isSame<3>(c3, "LQF") || isSame<3>(c3, "QLF")) {
if (IsNotComplex<T>::value) {
nb = 32;
} else {
nb = 32;
}
} else if (isSame<3>(c3, "HRD")) {
if (IsNotComplex<T>::value) {
nb = 32;
} else {
nb = 32;
}
} else if (isSame<3>(c3, "BRD")) {
if (IsNotComplex<T>::value) {
nb = 32;
} else {
nb = 32;
}
} else if (isSame<3>(c3, "TRI")) {
if (IsNotComplex<T>::value) {
nb = 64;
} else {
nb = 64;
}
}
} else if (isSame<2>(c2, "PO")) {
if (isSame<3>(c3, "TRF")) {
if (IsNotComplex<T>::value) {
nb = 64;
} else {
nb = 64;
}
}
} else if (isSame<2>(c2, "SY")) {
if (isSame<3>(c3, "TRF")) {
if (IsNotComplex<T>::value) {
nb = 64;
} else {
nb = 64;
}
} else if (IsNotComplex<T>::value && isSame<3>(c3, "TRD")) {
nb = 32;
} else if (IsNotComplex<T>::value && isSame<3>(c3, "GST")) {
nb = 64;
}
} else if (IsComplex<T>::value && isSame<2>(c2, "HE")) {
if (isSame<3>(c3, "TRF")) {
nb = 64;
} else if (isSame<3>(c3, "TRD")) {
nb = 32;
} else if (isSame<3>(c3, "GST")) {
nb = 64;
}
} else if (IsNotComplex<T>::value && isSame<2>(c2, "OR")) {
if (isSame<1>(c3, "G")) {
if (isSame<2>(c4, "QR") || isSame<2>(c4, "RQ")
|| isSame<2>(c4, "LQ") || isSame<2>(c4, "QL")
|| isSame<2>(c4, "HR") || isSame<2>(c4, "TR")
|| isSame<2>(c4, "BR"))
{
nb = 32;
}
} else if (isSame<1>(c3, "M")) {
if (isSame<2>(c4, "QR") || isSame<2>(c4, "RQ")
|| isSame<2>(c4, "LQ") || isSame<2>(c4, "QL")
|| isSame<2>(c4, "HR") || isSame<2>(c4, "TR")
|| isSame<2>(c4, "BR"))
{
nb = 32;
}
}
} else if (IsComplex<T>::value && isSame<2>(c2, "UN")) {
if (isSame<1>(c3, "G")) {
if (isSame<2>(c4, "QR") || isSame<2>(c4, "RQ")
|| isSame<2>(c4, "LQ") || isSame<2>(c4, "QL")
|| isSame<2>(c4, "HR") || isSame<2>(c4, "TR")
|| isSame<2>(c4, "BR"))
{
nb = 32;
}
} else if (isSame<1>(c3, "M")) {
if (isSame<2>(c4, "QR") || isSame<2>(c4, "RQ")
|| isSame<2>(c4, "LQ") || isSame<2>(c4, "QL")
|| isSame<2>(c4, "HR") || isSame<2>(c4, "TR")
|| isSame<2>(c4, "BR"))
{
nb = 32;
}
}
} else if (isSame<2>(c2, "GB")) {
if (isSame<3>(c3, "TRF")) {
if (IsNotComplex<T>::value) {
if (n4<=64) {
nb = 1;
} else {
nb = 32;
}
} else {
if (n4<=64) {
nb = 1;
} else {
nb = 32;
}
}
}
} else if (isSame<2>(c2, "PB")) {
if (isSame<3>(c3, "TRF")) {
if (IsNotComplex<T>::value) {
if (n2<=64) {
nb = 1;
} else {
nb = 32;
}
} else {
if (n2<=64 ) {
nb = 1;
} else {
nb = 32;
}
}
}
} else if (isSame<2>(c2, "TR")) {
if (isSame<3>(c3, "TRI")) {
if (IsNotComplex<T>::value) {
nb = 64;
} else {
nb = 64;
}
}
} else if (isSame<2>(c2, "LA")) {
if (isSame<3>(c3, "UUM")) {
if (IsNotComplex<T>::value) {
nb = 64;
} else {
nb = 64;
}
}
} else if (IsNotComplex<T>::value && isSame<2>(c2, "ST") ) {
if (isSame<3>(c3, "EBZ")) {
nb = 1;
}
}
result = nb;
break;
//
// minimal blocksize
//
case 2:
nbMin = 2;
if (isSame<2>(c2, "GE")) {
if (isSame<3>(c3, "QRF") || isSame<3>(c3, "RQF")
|| isSame<3>(c3, "LQF") || isSame<3>(c3, "QLF")) {
if (IsNotComplex<T>::value ) {
nbMin = 2;
} else {
nbMin = 2;
}
} else if (isSame<3>(c3, "HRD")) {
if (IsNotComplex<T>::value ) {
nbMin = 2;
} else {
nbMin = 2;
}
} else if (isSame<3>(c3, "BRD")) {
if (IsNotComplex<T>::value ) {
nbMin = 2;
} else {
nbMin = 2;
}
} else if (isSame<3>(c3, "TRI")) {
if (IsNotComplex<T>::value ) {
nbMin = 2;
} else {
nbMin = 2;
}
}
} else if (isSame<2>(c2, "SY")) {
if (isSame<3>(c3, "TRF")) {
if (IsNotComplex<T>::value ) {
nbMin = 8;
} else {
nbMin = 8;
}
} else if (IsNotComplex<T>::value && isSame<3>(c3, "TRD")) {
nbMin = 2;
}
} else if (IsComplex<T>::value && isSame<2>(c2, "HE")) {
if (isSame<3>(c3, "TRD")) {
nbMin = 2;
}
} else if (IsNotComplex<T>::value && isSame<2>(c2, "OR")) {
if (isSame<1>(c3, "G")) {
if (isSame<2>(c4, "QR") || isSame<2>(c4, "RQ")
|| isSame<2>(c4, "LQ") || isSame<2>(c4, "QL")
|| isSame<2>(c4, "HR") || isSame<2>(c4, "TR")
|| isSame<2>(c4, "BR")) {
nbMin = 2;
}
} else if (isSame<1>(c3, "M")) {
if (isSame<2>(c4, "QR") || isSame<2>(c4, "RQ")
|| isSame<2>(c4, "LQ") || isSame<2>(c4, "QL")
|| isSame<2>(c4, "HR") || isSame<2>(c4, "TR")
|| isSame<2>(c4, "BR")) {
nbMin = 2;
}
}
} else if (IsComplex<T>::value && isSame<2>(c2, "UN")) {
if (isSame<1>(c3, "G")) {
if (isSame<2>(c4, "QR") || isSame<2>(c4, "RQ")
|| isSame<2>(c4, "LQ") || isSame<2>(c4, "QL")
|| isSame<2>(c4, "HR") || isSame<2>(c4, "TR")
|| isSame<2>(c4, "BR")) {
nbMin = 2;
}
} else if (isSame<1>(c3, "M")) {
if (isSame<2>(c4, "QR") || isSame<2>(c4, "RQ")
|| isSame<2>(c4, "LQ") || isSame<2>(c4, "QL")
|| isSame<2>(c4, "HR") || isSame<2>(c4, "TR")
|| isSame<2>(c4, "BR")) {
nbMin = 2;
}
}
}
result = nbMin;
break;
//
// crossover point
//
case 3:
nx = 32;
if (isSame<2>(c2, "GE")) {
if (isSame<3>(c3, "QRF") || isSame<3>(c3, "RQF")
|| isSame<3>(c3, "LQF") || isSame<3>(c3, "QLF")) {
if (IsNotComplex<T>::value) {
nx = 128;
} else {
nx = 128;
}
} else if (isSame<3>(c3, "HRD")) {
if (IsNotComplex<T>::value) {
nx = 128;
} else {
nx = 128;
}
} else if (isSame<3>(c3, "BRD")) {
if (IsNotComplex<T>::value) {
nx = 128;
} else {
nx = 128;
}
}
} else if (isSame<2>(c2, "SY")) {
if (IsNotComplex<T>::value && isSame<3>(c3, "TRD")) {
nx = 32;
}
} else if (IsComplex<T>::value && isSame<2>(c2, "HE")) {
if (isSame<3>(c3, "TRD")) {
nx = 32;
}
} else if (IsNotComplex<T>::value && isSame<2>(c2, "OR")) {
if (isSame<1>(c3, "G")) {
if (isSame<2>(c4, "QR") || isSame<2>(c4, "RQ")
|| isSame<2>(c4, "LQ") || isSame<2>(c4, "QL")
|| isSame<2>(c4, "HR") || isSame<2>(c4, "TR")
|| isSame<2>(c4, "BR")) {
nx = 128;
}
}
} else if (IsComplex<T>::value && isSame<2>(c2, "UN")) {
if (isSame<1>(c3, "G")) {
if (isSame<2>(c4, "QR") || isSame<2>(c4, "RQ")
|| isSame<2>(c4, "LQ") || isSame<2>(c4, "QL")
|| isSame<2>(c4, "HR") || isSame<2>(c4, "TR")
|| isSame<2>(c4, "BR")) {
nx = 128;
}
}
}
result = nx/1.5;
break;
//
// DEPRECATED: number of shifts used in the nonsymmetric eigenvalue
// routines
//
case 4:
ASSERT(0);
break;
//
// 12 <= pec<= 16: hseqr or one of its subroutines ..
//
case 12:
case 13:
case 14:
case 15:
case 16:
result = iparmq<T>(spec, name, opts, n1, n2, n3, n4);
break;
default:
ASSERT(0);
result = -1;
break;
}
# ifdef LOG_ILAENV
std::cerr << "ILAENV_GENERIC: "
<< "spec = " << spec
<< ", name = " << name
<< ", opts = " << opts
<< ", n1 " << n1
<< ", n2 " << n2
<< ", n3 " << n3
<< ", n4 " << n4
<< ", result = " << result
<< std::endl;
# endif
return result;
}
} // namespace generic
//== interface for native lapack ===============================================
#if defined CHECK_CXXLAPACK || defined USE_NATIVE_ILAENV
#ifndef LAPACK_DECL
# define LAPACK_DECL(x) x##_
#endif
extern "C" {
INTEGER
LAPACK_DECL(ilaenv)(const INTEGER *SPEC,
const char *NAME,
const char *OPTS,
const INTEGER *N1,
const INTEGER *N2,
const INTEGER *N3,
const INTEGER *N4,
int NAME_LEN,
int OPTS_LEN);
} // extern "C"
template <typename T>
int
ilaenv_LapackTest(int spec, const char *name_, const char *opts,
int n1, int n2, int n3, int n4)
{
using std::complex;
char name[strlen(name_)+2];
if (IsSame<T,float>::value) {
*name = 'S';
} else if (IsSame<T,double>::value) {
*name = 'D';
} else if (IsSame<T,complex<float> >::value) {
*name = 'C';
} else if (IsSame<T,complex<double> >::value) {
*name = 'Z';
} else {
ASSERT(0);
}
strcpy(name+1, name_);
#if defined CHECK_CXXLAPACK || defined USE_NATIVE_ILAENV
INTEGER spec_ = spec;
INTEGER n1_ = n1;
INTEGER n2_ = n2;
INTEGER n3_ = n3;
INTEGER n4_ = n4;
int result = LAPACK_DECL(ilaenv)(&spec_,
name,
opts,
&n1_,
&n2_,
&n3_,
&n4_,
strlen(name),
strlen(opts));
return result;
#else
ASSERT(0);
#endif
}
#endif // CHECK_CXXLAPACK
//== public interface ==========================================================
template <typename T>
int
ilaenv(int spec, const char *name, const char *opts,
int n1, int n2, int n3, int n4)
{
int info;
#if defined USE_ILAENV_WITH_UNDERSCORE
info = ilaenv_LapackTest<T>(spec, name, opts, n1, n2, n3, n4);
#else
info = generic::ilaenv_impl<T>(spec, name, opts, n1, n2, n3, n4);
#endif
return info;
}
} } // namespace lapack, flens
#endif // FLENS_LAPACK_LA_ILAENV_TCC