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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_LAPACK_LAISNAN_HEADER
#define TEMPLATE_LAPACK_LAISNAN_HEADER
template<class Treal>
logical template_lapack_laisnan(Treal *din1, Treal *din2)
{
/* System generated locals */
logical ret_val;
/* -- LAPACK auxiliary routine (version 3.2) -- */
/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
/* November 2006 */
/* .. Scalar Arguments .. */
/* .. */
/* Purpose */
/* ======= */
/* This routine is not for general use. It exists solely to avoid */
/* over-optimization in DISNAN. */
/* DLAISNAN checks for NaNs by comparing its two arguments for */
/* inequality. NaN is the only floating-point value where NaN != NaN */
/* returns .TRUE. To check for NaNs, pass the same variable as both */
/* arguments. */
/* A compiler must assume that the two arguments are */
/* not the same variable, and the test will not be optimized away. */
/* Interprocedural or whole-program optimization may delete this */
/* test. The ISNAN functions will be replaced by the correct */
/* Fortran 03 intrinsic once the intrinsic is widely available. */
/* Arguments */
/* ========= */
/* DIN1 (input) DOUBLE PRECISION */
/* DIN2 (input) DOUBLE PRECISION */
/* Two numbers to compare for inequality. */
/* ===================================================================== */
/* .. Executable Statements .. */
ret_val = *din1 != *din2;
return ret_val;
} /* dlaisnan_ */
#endif
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