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/* 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;
}
}
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