| /* blas/source_rotmg.h |
| * |
| * Copyright (C) 1996, 1997, 1998, 1999, 2000 Brian Gough |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or (at |
| * your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| */ |
| |
| { |
| INDEX n; |
| INDEX i = OFFSET(N, incX); |
| INDEX j = OFFSET(N, incY); |
| |
| BASE h11, h21, h12, h22; |
| |
| if (P[0] == -1.0) { |
| h11 = P[1]; |
| h21 = P[2]; |
| h12 = P[3]; |
| h22 = P[4]; |
| } else if (P[0] == 0.0) { |
| h11 = 1.0; |
| h21 = P[2]; |
| h12 = P[3]; |
| h22 = 1.0; |
| } else if (P[0] == 1.0) { |
| h11 = P[1]; |
| h21 = -1.0; |
| h12 = 1.0; |
| h22 = P[4]; |
| } else if (P[0] == -2.0) { |
| return; |
| } else { |
| BLAS_ERROR("unrecognized value of P[0]"); |
| return; |
| } |
| |
| for (n = 0; n < N; n++) { |
| const BASE w = X[i]; |
| const BASE z = Y[j]; |
| X[i] = h11 * w + h12 * z; |
| Y[j] = h21 * w + h22 * z; |
| i += incX; |
| j += incY; |
| } |
| |
| } |
