00001 /* Ergo, version 3.2, a program for linear scaling electronic structure 00002 * calculations. 00003 * Copyright (C) 2012 Elias Rudberg, Emanuel H. Rubensson, and Pawel Salek. 00004 * 00005 * This program is free software: you can redistribute it and/or modify 00006 * it under the terms of the GNU General Public License as published by 00007 * the Free Software Foundation, either version 3 of the License, or 00008 * (at your option) any later version. 00009 * 00010 * This program is distributed in the hope that it will be useful, 00011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00013 * GNU General Public License for more details. 00014 * 00015 * You should have received a copy of the GNU General Public License 00016 * along with this program. If not, see <http://www.gnu.org/licenses/>. 00017 * 00018 * Primary academic reference: 00019 * KohnâSham Density Functional Theory Electronic Structure Calculations 00020 * with Linearly Scaling Computational Time and Memory Usage, 00021 * Elias Rudberg, Emanuel H. Rubensson, and Pawel Salek, 00022 * J. Chem. Theory Comput. 7, 340 (2011), 00023 * <http://dx.doi.org/10.1021/ct100611z> 00024 * 00025 * For further information about Ergo, see <http://www.ergoscf.org>. 00026 */ 00027 00028 /* This file belongs to the template_lapack part of the Ergo source 00029 * code. The source files in the template_lapack directory are modified 00030 * versions of files originally distributed as CLAPACK, see the 00031 * Copyright/license notice in the file template_lapack/COPYING. 00032 */ 00033 00034 00035 #ifndef TEMPLATE_BLAS_SCAL_HEADER 00036 #define TEMPLATE_BLAS_SCAL_HEADER 00037 00038 #include "template_blas_common.h" 00039 00040 template<class Treal> 00041 int template_blas_scal(const integer *n, const Treal *da, Treal *dx, 00042 const integer *incx) 00043 { 00044 /* System generated locals */ 00045 integer i__1, i__2; 00046 /* Local variables */ 00047 integer i__, m, nincx, mp1; 00048 /* scales a vector by a constant. 00049 uses unrolled loops for increment equal to one. 00050 jack dongarra, linpack, 3/11/78. 00051 modified 3/93 to return if incx .le. 0. 00052 modified 12/3/93, array(1) declarations changed to array(*) 00053 Parameter adjustments */ 00054 --dx; 00055 /* Function Body */ 00056 if (*n <= 0 || *incx <= 0) { 00057 return 0; 00058 } 00059 if (*incx == 1) { 00060 goto L20; 00061 } 00062 /* code for increment not equal to 1 */ 00063 nincx = *n * *incx; 00064 i__1 = nincx; 00065 i__2 = *incx; 00066 for (i__ = 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) { 00067 dx[i__] = *da * dx[i__]; 00068 /* L10: */ 00069 } 00070 return 0; 00071 /* code for increment equal to 1 00072 clean-up loop */ 00073 L20: 00074 m = *n % 5; 00075 if (m == 0) { 00076 goto L40; 00077 } 00078 i__2 = m; 00079 for (i__ = 1; i__ <= i__2; ++i__) { 00080 dx[i__] = *da * dx[i__]; 00081 /* L30: */ 00082 } 00083 if (*n < 5) { 00084 return 0; 00085 } 00086 L40: 00087 mp1 = m + 1; 00088 i__2 = *n; 00089 for (i__ = mp1; i__ <= i__2; i__ += 5) { 00090 dx[i__] = *da * dx[i__]; 00091 dx[i__ + 1] = *da * dx[i__ + 1]; 00092 dx[i__ + 2] = *da * dx[i__ + 2]; 00093 dx[i__ + 3] = *da * dx[i__ + 3]; 00094 dx[i__ + 4] = *da * dx[i__ + 4]; 00095 /* L50: */ 00096 } 00097 return 0; 00098 } /* dscal_ */ 00099 00100 #endif