00001 /* Ergo, version 3.7, a program for linear scaling electronic structure 00002 * calculations. 00003 * Copyright (C) 2018 Elias Rudberg, Emanuel H. Rubensson, Pawel Salek, 00004 * and Anastasia Kruchinina. 00005 * 00006 * This program is free software: you can redistribute it and/or modify 00007 * it under the terms of the GNU General Public License as published by 00008 * the Free Software Foundation, either version 3 of the License, or 00009 * (at your option) any later version. 00010 * 00011 * This program is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 * GNU General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU General Public License 00017 * along with this program. If not, see <http://www.gnu.org/licenses/>. 00018 * 00019 * Primary academic reference: 00020 * Ergo: An open-source program for linear-scaling electronic structure 00021 * calculations, 00022 * Elias Rudberg, Emanuel H. Rubensson, Pawel Salek, and Anastasia 00023 * Kruchinina, 00024 * SoftwareX 7, 107 (2018), 00025 * <http://dx.doi.org/10.1016/j.softx.2018.03.005> 00026 * 00027 * For further information about Ergo, see <http://www.ergoscf.org>. 00028 */ 00029 00030 /* This file belongs to the template_lapack part of the Ergo source 00031 * code. The source files in the template_lapack directory are modified 00032 * versions of files originally distributed as CLAPACK, see the 00033 * Copyright/license notice in the file template_lapack/COPYING. 00034 */ 00035 00036 00037 #ifndef TEMPLATE_BLAS_SCAL_HEADER 00038 #define TEMPLATE_BLAS_SCAL_HEADER 00039 00040 #include "template_blas_common.h" 00041 00042 template<class Treal> 00043 int template_blas_scal(const integer *n, const Treal *da, Treal *dx, 00044 const integer *incx) 00045 { 00046 /* System generated locals */ 00047 integer i__1, i__2; 00048 /* Local variables */ 00049 integer i__, m, nincx, mp1; 00050 /* scales a vector by a constant. 00051 uses unrolled loops for increment equal to one. 00052 jack dongarra, linpack, 3/11/78. 00053 modified 3/93 to return if incx .le. 0. 00054 modified 12/3/93, array(1) declarations changed to array(*) 00055 Parameter adjustments */ 00056 --dx; 00057 /* Function Body */ 00058 if (*n <= 0 || *incx <= 0) { 00059 return 0; 00060 } 00061 if (*incx == 1) { 00062 goto L20; 00063 } 00064 /* code for increment not equal to 1 */ 00065 nincx = *n * *incx; 00066 i__1 = nincx; 00067 i__2 = *incx; 00068 for (i__ = 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) { 00069 dx[i__] = *da * dx[i__]; 00070 /* L10: */ 00071 } 00072 return 0; 00073 /* code for increment equal to 1 00074 clean-up loop */ 00075 L20: 00076 m = *n % 5; 00077 if (m == 0) { 00078 goto L40; 00079 } 00080 i__2 = m; 00081 for (i__ = 1; i__ <= i__2; ++i__) { 00082 dx[i__] = *da * dx[i__]; 00083 /* L30: */ 00084 } 00085 if (*n < 5) { 00086 return 0; 00087 } 00088 L40: 00089 mp1 = m + 1; 00090 i__2 = *n; 00091 for (i__ = mp1; i__ <= i__2; i__ += 5) { 00092 dx[i__] = *da * dx[i__]; 00093 dx[i__ + 1] = *da * dx[i__ + 1]; 00094 dx[i__ + 2] = *da * dx[i__ + 2]; 00095 dx[i__ + 3] = *da * dx[i__ + 3]; 00096 dx[i__ + 4] = *da * dx[i__ + 4]; 00097 /* L50: */ 00098 } 00099 return 0; 00100 } /* dscal_ */ 00101 00102 #endif