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/* Ergo, version 3.8, a program for linear scaling electronic structure
* calculations.
* Copyright (C) 2019 Elias Rudberg, Emanuel H. Rubensson, Pawel Salek,
* and Anastasia Kruchinina.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Primary academic reference:
* Ergo: An open-source program for linear-scaling electronic structure
* calculations,
* Elias Rudberg, Emanuel H. Rubensson, Pawel Salek, and Anastasia
* Kruchinina,
* SoftwareX 7, 107 (2018),
* <http://dx.doi.org/10.1016/j.softx.2018.03.005>
*
* For further information about Ergo, see <http://www.ergoscf.org>.
*/
/* This file belongs to the template_lapack part of the Ergo source
* code. The source files in the template_lapack directory are modified
* versions of files originally distributed as CLAPACK, see the
* Copyright/license notice in the file template_lapack/COPYING.
*/
#ifndef TEMPLATE_BLAS_NUM_LIMITS_HEADER
#define TEMPLATE_BLAS_NUM_LIMITS_HEADER
#include <limits>
/* We need to include config.h to get macro PRECISION_QUAD_FLT128 */
#include "config.h"
#ifdef PRECISION_QUAD_FLT128
#include <quadmath.h>
#endif
/* template_blas_get_machine_epsilon(): function for getting the
machine epsilon (the difference between 1 and the least value
greater than 1 that is representable) for the given
floating-point type. */
template<typename Treal>
inline static Treal template_blas_get_machine_epsilon() {
return std::numeric_limits<Treal>::epsilon();
}
#ifdef PRECISION_QUAD_FLT128
template<>
inline __float128 template_blas_get_machine_epsilon<__float128>() {
return FLT128_EPSILON;
}
#endif
/* template_blas_get_num_limit_min(): function for getting the minimum
positive normalized value for the given floating-point type. */
template<typename Treal>
inline static Treal template_blas_get_num_limit_min() {
return std::numeric_limits<Treal>::min();
}
#ifdef PRECISION_QUAD_FLT128
template<>
inline __float128 template_blas_get_num_limit_min<__float128>() {
return FLT128_MIN; // FLT128_MIN: smallest positive number with full precision
}
#endif
/* template_blas_get_num_limit_max(): function for getting the maximum
finite value for the given floating-point type. */
template<typename Treal>
inline static Treal template_blas_get_num_limit_max() {
return std::numeric_limits<Treal>::max();
}
#ifdef PRECISION_QUAD_FLT128
template<>
inline __float128 template_blas_get_num_limit_max<__float128>() {
return FLT128_MAX; // FLT128_MAX: largest finite number
}
#endif
#endif
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