ergo
template_blas_rot.h
Go to the documentation of this file.
1/* Ergo, version 3.8, a program for linear scaling electronic structure
2 * calculations.
3 * Copyright (C) 2019 Elias Rudberg, Emanuel H. Rubensson, Pawel Salek,
4 * and Anastasia Kruchinina.
5 *
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 *
19 * Primary academic reference:
20 * Ergo: An open-source program for linear-scaling electronic structure
21 * calculations,
22 * Elias Rudberg, Emanuel H. Rubensson, Pawel Salek, and Anastasia
23 * Kruchinina,
24 * SoftwareX 7, 107 (2018),
25 * <http://dx.doi.org/10.1016/j.softx.2018.03.005>
26 *
27 * For further information about Ergo, see <http://www.ergoscf.org>.
28 */
29
30 /* This file belongs to the template_lapack part of the Ergo source
31 * code. The source files in the template_lapack directory are modified
32 * versions of files originally distributed as CLAPACK, see the
33 * Copyright/license notice in the file template_lapack/COPYING.
34 */
35
36
37#ifndef TEMPLATE_BLAS_ROT_HEADER
38#define TEMPLATE_BLAS_ROT_HEADER
39
40
41template<class Treal>
42int template_blas_rot(const integer *n, Treal *dx, const integer *incx,
43 Treal *dy, const integer *incy, const Treal *c__, const Treal *s)
44{
45 /* System generated locals */
46 integer i__1;
47 /* Local variables */
48 integer i__;
49 Treal dtemp;
50 integer ix, iy;
51/* applies a plane rotation.
52 jack dongarra, linpack, 3/11/78.
53 modified 12/3/93, array(1) declarations changed to array(*)
54 Parameter adjustments */
55 --dy;
56 --dx;
57 /* Function Body */
58 if (*n <= 0) {
59 return 0;
60 }
61 if (*incx == 1 && *incy == 1) {
62 goto L20;
63 }
64/* code for unequal increments or equal increments not equal
65 to 1 */
66 ix = 1;
67 iy = 1;
68 if (*incx < 0) {
69 ix = (-(*n) + 1) * *incx + 1;
70 }
71 if (*incy < 0) {
72 iy = (-(*n) + 1) * *incy + 1;
73 }
74 i__1 = *n;
75 for (i__ = 1; i__ <= i__1; ++i__) {
76 dtemp = *c__ * dx[ix] + *s * dy[iy];
77 dy[iy] = *c__ * dy[iy] - *s * dx[ix];
78 dx[ix] = dtemp;
79 ix += *incx;
80 iy += *incy;
81/* L10: */
82 }
83 return 0;
84/* code for both increments equal to 1 */
85L20:
86 i__1 = *n;
87 for (i__ = 1; i__ <= i__1; ++i__) {
88 dtemp = *c__ * dx[i__] + *s * dy[i__];
89 dy[i__] = *c__ * dy[i__] - *s * dx[i__];
90 dx[i__] = dtemp;
91/* L30: */
92 }
93 return 0;
94} /* drot_ */
95
96#endif
int integer
Definition: template_blas_common.h:40
int template_blas_rot(const integer *n, Treal *dx, const integer *incx, Treal *dy, const integer *incy, const Treal *c__, const Treal *s)
Definition: template_blas_rot.h:42