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template_lapack_laisnan.h
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/* Ergo, version 3.2, a program for linear scaling electronic structure
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* calculations.
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* Copyright (C) 2012 Elias Rudberg, Emanuel H. Rubensson, and Pawel Salek.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Primary academic reference:
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* KohnâSham Density Functional Theory Electronic Structure Calculations
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* with Linearly Scaling Computational Time and Memory Usage,
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* Elias Rudberg, Emanuel H. Rubensson, and Pawel Salek,
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* J. Chem. Theory Comput. 7, 340 (2011),
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* <http://dx.doi.org/10.1021/ct100611z>
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*
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* For further information about Ergo, see <http://www.ergoscf.org>.
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*/
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/* This file belongs to the template_lapack part of the Ergo source
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* code. The source files in the template_lapack directory are modified
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* versions of files originally distributed as CLAPACK, see the
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* Copyright/license notice in the file template_lapack/COPYING.
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*/
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#ifndef TEMPLATE_LAPACK_LAISNAN_HEADER
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#define TEMPLATE_LAPACK_LAISNAN_HEADER
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template
<
class
Treal>
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logical
template_lapack_laisnan
(Treal *din1, Treal *din2)
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{
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/* System generated locals */
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logical
ret_val;
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/* -- LAPACK auxiliary routine (version 3.2) -- */
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/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
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/* November 2006 */
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/* .. Scalar Arguments .. */
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/* .. */
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/* Purpose */
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/* ======= */
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/* This routine is not for general use. It exists solely to avoid */
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/* over-optimization in DISNAN. */
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/* DLAISNAN checks for NaNs by comparing its two arguments for */
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/* inequality. NaN is the only floating-point value where NaN != NaN */
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/* returns .TRUE. To check for NaNs, pass the same variable as both */
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/* arguments. */
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/* A compiler must assume that the two arguments are */
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/* not the same variable, and the test will not be optimized away. */
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/* Interprocedural or whole-program optimization may delete this */
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/* test. The ISNAN functions will be replaced by the correct */
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/* Fortran 03 intrinsic once the intrinsic is widely available. */
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/* Arguments */
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/* ========= */
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/* DIN1 (input) DOUBLE PRECISION */
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/* DIN2 (input) DOUBLE PRECISION */
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/* Two numbers to compare for inequality. */
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/* ===================================================================== */
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/* .. Executable Statements .. */
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ret_val = *din1 != *din2;
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return
ret_val;
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}
/* dlaisnan_ */
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#endif
source
matrix
template_lapack
lapack
template_lapack_laisnan.h
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