/* blas/source_geru.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_ARGS10(CZ_GERU,order,M,N,alpha,X,incX,Y,incY,A,lda);

  {
    const BASE alpha_real = CONST_REAL0(alpha);
    const BASE alpha_imag = CONST_IMAG0(alpha);

    if (order == CblasRowMajor) {
      INDEX ix = OFFSET(M, incX);
      for (i = 0; i < M; i++) {
        const BASE X_real = CONST_REAL(X, ix);
        const BASE X_imag = CONST_IMAG(X, ix);
        const BASE tmp_real = alpha_real * X_real - alpha_imag * X_imag;
        const BASE tmp_imag = alpha_imag * X_real + alpha_real * X_imag;
        INDEX jy = OFFSET(N, incY);
        for (j = 0; j < N; j++) {
          const BASE Y_real = CONST_REAL(Y, jy);
          const BASE Y_imag = CONST_IMAG(Y, jy);
          REAL(A, lda * i + j) += Y_real * tmp_real - Y_imag * tmp_imag;
          IMAG(A, lda * i + j) += Y_imag * tmp_real + Y_real * tmp_imag;
          jy += incY;
        }
        ix += incX;
      }
    } else if (order == CblasColMajor) {
      INDEX jy = OFFSET(N, incY);
      for (j = 0; j < N; j++) {
        const BASE Y_real = CONST_REAL(Y, jy);
        const BASE Y_imag = CONST_IMAG(Y, jy);
        const BASE tmp_real = alpha_real * Y_real - alpha_imag * Y_imag;
        const BASE tmp_imag = alpha_imag * Y_real + alpha_real * Y_imag;
        INDEX ix = OFFSET(M, incX);
        for (i = 0; i < M; i++) {
          const BASE X_real = CONST_REAL(X, ix);
          const BASE X_imag = CONST_IMAG(X, ix);
          REAL(A, i + lda * j) += X_real * tmp_real - X_imag * tmp_imag;
          IMAG(A, i + lda * j) += X_imag * tmp_real + X_real * tmp_imag;
          ix += incX;
        }
        jy += incY;
      }
    } else {
      BLAS_ERROR("unrecognized operation");
    }
  }
}