template_blas_copy.h

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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  * Kohn−Sham 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_COPY_HEADER
00036 #define TEMPLATE_BLAS_COPY_HEADER
00037 
00038 
00039 template<class Treal>
00040 int template_blas_copy(const integer *n, const Treal *dx, const integer *incx, 
00041         Treal *dy, const integer *incy)
00042 {
00043     /* System generated locals */
00044     integer i__1;
00045     /* Local variables */
00046      integer i__, m, ix, iy, mp1;
00047 /*     copies a vector, x, to a vector, y.   
00048        uses unrolled loops for increments equal to one.   
00049        jack dongarra, linpack, 3/11/78.   
00050        modified 12/3/93, array(1) declarations changed to array(*)   
00051        Parameter adjustments */
00052     --dy;
00053     --dx;
00054     /* Function Body */
00055     if (*n <= 0) {
00056         return 0;
00057     }
00058     if (*incx == 1 && *incy == 1) {
00059         goto L20;
00060     }
00061 /*        code for unequal increments or equal increments   
00062             not equal to 1 */
00063     ix = 1;
00064     iy = 1;
00065     if (*incx < 0) {
00066         ix = (-(*n) + 1) * *incx + 1;
00067     }
00068     if (*incy < 0) {
00069         iy = (-(*n) + 1) * *incy + 1;
00070     }
00071     i__1 = *n;
00072     for (i__ = 1; i__ <= i__1; ++i__) {
00073         dy[iy] = dx[ix];
00074         ix += *incx;
00075         iy += *incy;
00076 /* L10: */
00077     }
00078     return 0;
00079 /*        code for both increments equal to 1   
00080           clean-up loop */
00081 L20:
00082     m = *n % 7;
00083     if (m == 0) {
00084         goto L40;
00085     }
00086     i__1 = m;
00087     for (i__ = 1; i__ <= i__1; ++i__) {
00088         dy[i__] = dx[i__];
00089 /* L30: */
00090     }
00091     if (*n < 7) {
00092         return 0;
00093     }
00094 L40:
00095     mp1 = m + 1;
00096     i__1 = *n;
00097     for (i__ = mp1; i__ <= i__1; i__ += 7) {
00098         dy[i__] = dx[i__];
00099         dy[i__ + 1] = dx[i__ + 1];
00100         dy[i__ + 2] = dx[i__ + 2];
00101         dy[i__ + 3] = dx[i__ + 3];
00102         dy[i__ + 4] = dx[i__ + 4];
00103         dy[i__ + 5] = dx[i__ + 5];
00104         dy[i__ + 6] = dx[i__ + 6];
00105 /* L50: */
00106     }
00107     return 0;
00108 } /* dcopy_ */
00109 
00110 #endif

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