ergo
template_blas_asum.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_ASUM_HEADER
38#define TEMPLATE_BLAS_ASUM_HEADER
39
40
41template<class Treal>
42Treal template_blas_asum(const integer *n, const Treal *dx, const integer *incx)
43{
44 /* System generated locals */
45 integer i__1, i__2;
46 Treal ret_val, d__1, d__2, d__3, d__4, d__5, d__6;
47 /* Local variables */
48 integer i__, m;
49 Treal dtemp;
50 integer nincx, mp1;
51/* takes the sum of the absolute values.
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 ret_val = 0.;
59 dtemp = 0.;
60 if (*n <= 0 || *incx <= 0) {
61 return ret_val;
62 }
63 if (*incx == 1) {
64 goto L20;
65 }
66/* code for increment not equal to 1 */
67 nincx = *n * *incx;
68 i__1 = nincx;
69 i__2 = *incx;
70 for (i__ = 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) {
71 dtemp += (d__1 = dx[i__], absMACRO(d__1));
72/* L10: */
73 }
74 ret_val = dtemp;
75 return ret_val;
76/* code for increment equal to 1
77 clean-up loop */
78L20:
79 m = *n % 6;
80 if (m == 0) {
81 goto L40;
82 }
83 i__2 = m;
84 for (i__ = 1; i__ <= i__2; ++i__) {
85 dtemp += (d__1 = dx[i__], absMACRO(d__1));
86/* L30: */
87 }
88 if (*n < 6) {
89 goto L60;
90 }
91L40:
92 mp1 = m + 1;
93 i__2 = *n;
94 for (i__ = mp1; i__ <= i__2; i__ += 6) {
95 dtemp = dtemp + (d__1 = dx[i__], absMACRO(d__1)) + (d__2 = dx[i__ + 1],
96 absMACRO(d__2)) + (d__3 = dx[i__ + 2], absMACRO(d__3)) + (d__4 = dx[i__
97 + 3], absMACRO(d__4)) + (d__5 = dx[i__ + 4], absMACRO(d__5)) + (d__6 =
98 dx[i__ + 5], absMACRO(d__6));
99/* L50: */
100 }
101L60:
102 ret_val = dtemp;
103 return ret_val;
104} /* dasum_ */
105
106#endif
Treal template_blas_asum(const integer *n, const Treal *dx, const integer *incx)
Definition template_blas_asum.h:42
int integer
Definition template_blas_common.h:40
#define absMACRO(x)
Definition template_blas_common.h:47