ergo
template_lapack_laisnan.h
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1 /* Ergo, version 3.3, a program for linear scaling electronic structure
2  * calculations.
3  * Copyright (C) 2013 Elias Rudberg, Emanuel H. Rubensson, and Pawel Salek.
4  *
5  * This program is free software: you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
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8  * (at your option) any later version.
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13  * GNU General Public License for more details.
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15  * You should have received a copy of the GNU General Public License
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17  *
18  * Primary academic reference:
19  * Kohn−Sham Density Functional Theory Electronic Structure Calculations
20  * with Linearly Scaling Computational Time and Memory Usage,
21  * Elias Rudberg, Emanuel H. Rubensson, and Pawel Salek,
22  * J. Chem. Theory Comput. 7, 340 (2011),
23  * <http://dx.doi.org/10.1021/ct100611z>
24  *
25  * For further information about Ergo, see <http://www.ergoscf.org>.
26  */
27 
28  /* This file belongs to the template_lapack part of the Ergo source
29  * code. The source files in the template_lapack directory are modified
30  * versions of files originally distributed as CLAPACK, see the
31  * Copyright/license notice in the file template_lapack/COPYING.
32  */
33 
34 
35 #ifndef TEMPLATE_LAPACK_LAISNAN_HEADER
36 #define TEMPLATE_LAPACK_LAISNAN_HEADER
37 
38 template<class Treal>
39 logical template_lapack_laisnan(Treal *din1, Treal *din2)
40 {
41  /* System generated locals */
42  logical ret_val;
43 
44 
45 /* -- LAPACK auxiliary routine (version 3.2) -- */
46 /* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
47 /* November 2006 */
48 
49 /* .. Scalar Arguments .. */
50 /* .. */
51 
52 /* Purpose */
53 /* ======= */
54 
55 /* This routine is not for general use. It exists solely to avoid */
56 /* over-optimization in DISNAN. */
57 
58 /* DLAISNAN checks for NaNs by comparing its two arguments for */
59 /* inequality. NaN is the only floating-point value where NaN != NaN */
60 /* returns .TRUE. To check for NaNs, pass the same variable as both */
61 /* arguments. */
62 
63 /* A compiler must assume that the two arguments are */
64 /* not the same variable, and the test will not be optimized away. */
65 /* Interprocedural or whole-program optimization may delete this */
66 /* test. The ISNAN functions will be replaced by the correct */
67 /* Fortran 03 intrinsic once the intrinsic is widely available. */
68 
69 /* Arguments */
70 /* ========= */
71 
72 /* DIN1 (input) DOUBLE PRECISION */
73 /* DIN2 (input) DOUBLE PRECISION */
74 /* Two numbers to compare for inequality. */
75 
76 /* ===================================================================== */
77 
78 /* .. Executable Statements .. */
79  ret_val = *din1 != *din2;
80  return ret_val;
81 } /* dlaisnan_ */
82 
83 #endif
logical template_lapack_laisnan(Treal *din1, Treal *din2)
Definition: template_lapack_laisnan.h:39
bool logical
Definition: template_blas_common.h:39