ergo
template_blas_scal.h
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1/* Ergo, version 3.8.2, a program for linear scaling electronic structure
2 * calculations.
3 * Copyright (C) 2023 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_SCAL_HEADER
38#define TEMPLATE_BLAS_SCAL_HEADER
39
41
42template<class Treal>
43int template_blas_scal(const integer *n, const Treal *da, Treal *dx,
44 const integer *incx)
45{
46 /* System generated locals */
47 integer i__1, i__2;
48 /* Local variables */
49 integer i__, m, nincx, mp1;
50/* scales a vector by a constant.
51 uses unrolled loops for increment equal to one.
52 jack dongarra, linpack, 3/11/78.
53 modified 3/93 to return if incx .le. 0.
54 modified 12/3/93, array(1) declarations changed to array(*)
55 Parameter adjustments */
56 --dx;
57 /* Function Body */
58 if (*n <= 0 || *incx <= 0) {
59 return 0;
60 }
61 if (*incx == 1) {
62 goto L20;
63 }
64/* code for increment not equal to 1 */
65 nincx = *n * *incx;
66 i__1 = nincx;
67 i__2 = *incx;
68 for (i__ = 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) {
69 dx[i__] = *da * dx[i__];
70/* L10: */
71 }
72 return 0;
73/* code for increment equal to 1
74 clean-up loop */
75L20:
76 m = *n % 5;
77 if (m == 0) {
78 goto L40;
79 }
80 i__2 = m;
81 for (i__ = 1; i__ <= i__2; ++i__) {
82 dx[i__] = *da * dx[i__];
83/* L30: */
84 }
85 if (*n < 5) {
86 return 0;
87 }
88L40:
89 mp1 = m + 1;
90 i__2 = *n;
91 for (i__ = mp1; i__ <= i__2; i__ += 5) {
92 dx[i__] = *da * dx[i__];
93 dx[i__ + 1] = *da * dx[i__ + 1];
94 dx[i__ + 2] = *da * dx[i__ + 2];
95 dx[i__ + 3] = *da * dx[i__ + 3];
96 dx[i__ + 4] = *da * dx[i__ + 4];
97/* L50: */
98 }
99 return 0;
100} /* dscal_ */
101
102#endif
int integer
Definition: template_blas_common.h:40
int template_blas_scal(const integer *n, const Treal *da, Treal *dx, const integer *incx)
Definition: template_blas_scal.h:43