1 /* blas/source_nrm2_c.h
3 * Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or (at
8 * your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
26 if (N == 0 || incX < 1) {
30 for (i = 0; i < N; i++) {
31 const BASE x = CONST_REAL(X, ix);
32 const BASE y = CONST_IMAG(X, ix);
35 const BASE ax = fabs(x);
38 ssq = 1.0 + ssq * (scale / ax) * (scale / ax);
41 ssq += (ax / scale) * (ax / scale);
46 const BASE ay = fabs(y);
49 ssq = 1.0 + ssq * (scale / ay) * (scale / ay);
52 ssq += (ay / scale) * (ay / scale);
59 return scale * sqrt(ssq);