/* blas/source_spr.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, j;

  CHECK_ARGS7(SD_SPR,order,Uplo,N,alpha,X,incX,Ap);

  if (N == 0)

    return;

  if (alpha == 0.0)

    return;

  if ((order == CblasRowMajor && Uplo == CblasUpper)

      || (order == CblasColMajor && Uplo == CblasLower)) {

    INDEX ix = OFFSET(N, incX);

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

      const BASE tmp = alpha * X[ix];

      INDEX jx = ix;

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

        Ap[TPUP(N, i, j)] += X[jx] * tmp;

        jx += incX;

      }

      ix += incX;

    }

  } else if ((order == CblasRowMajor && Uplo == CblasLower)

             || (order == CblasColMajor && Uplo == CblasUpper)) {

    INDEX ix = OFFSET(N, incX);

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

      const BASE tmp = alpha * X[ix];

      INDEX jx = OFFSET(N, incX);

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

        Ap[TPLO(N, i, j)] += X[jx] * tmp;

        jx += incX;

      }

      ix += incX;

    }

  } else {

    BLAS_ERROR("unrecognized operation");

  }

}