/* blas/source_axpy_r.h

 * 

 * Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman

 * 

 * 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 3 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 i;

  if (alpha == 0.0) {

    return;

  }

  if (incX == 1 && incY == 1) {

    const INDEX m = N % 4;

    for (i = 0; i < m; i++) {

      Y[i] += alpha * X[i];

    }

    for (i = m; i + 3 < N; i += 4) {

      Y[i] += alpha * X[i];

      Y[i + 1] += alpha * X[i + 1];

      Y[i + 2] += alpha * X[i + 2];

      Y[i + 3] += alpha * X[i + 3];

    }

  } else {

    INDEX ix = OFFSET(N, incX);

    INDEX iy = OFFSET(N, incY);

    for (i = 0; i < N; i++) {

      Y[iy] += alpha * X[ix];

      ix += incX;

      iy += incY;

    }

  }

}