/* blas/source_syrk_c.h

 *

 * Copyright (C) 2001, 2007 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 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, k;

  int uplo, trans;

  CHECK_ARGS11(SYRK,Order,Uplo,Trans,N,K,alpha,A,lda,beta,C,ldc);

  {

    const BASE alpha_real = CONST_REAL0(alpha);

    const BASE alpha_imag = CONST_IMAG0(alpha);

    const BASE beta_real = CONST_REAL0(beta);

    const BASE beta_imag = CONST_IMAG0(beta);

    if ((alpha_real == 0.0 && alpha_imag == 0.0)

        && (beta_real == 1.0 && beta_imag == 0.0))

      return;

    if (Order == CblasRowMajor) {

      uplo = Uplo;

      /* FIXME: original blas does not make distinction between Trans and ConjTrans?? */

      trans = (Trans == CblasNoTrans) ? CblasNoTrans : CblasTrans;

    } else {

      uplo = (Uplo == CblasUpper) ? CblasLower : CblasUpper;

      trans = (Trans == CblasNoTrans) ? CblasTrans : CblasNoTrans;

    }

    /* form  y := beta*y */

    if (beta_real == 0.0 && beta_imag == 0.0) {

      if (uplo == CblasUpper) {

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

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

            REAL(C, ldc * i + j) = 0.0;

            IMAG(C, ldc * i + j) = 0.0;

          }

        }

      } else {

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

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

            REAL(C, ldc * i + j) = 0.0;

            IMAG(C, ldc * i + j) = 0.0;

          }

        }

      }

    } else if (!(beta_real == 1.0 && beta_imag == 0.0)) {

      if (uplo == CblasUpper) {

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

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

            const BASE Cij_real = REAL(C, ldc * i + j);

            const BASE Cij_imag = IMAG(C, ldc * i + j);

            REAL(C, ldc * i + j) = beta_real * Cij_real - beta_imag * Cij_imag;

            IMAG(C, ldc * i + j) = beta_real * Cij_imag + beta_imag * Cij_real;

          }

        }

      } else {

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

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

            const BASE Cij_real = REAL(C, ldc * i + j);

            const BASE Cij_imag = IMAG(C, ldc * i + j);

            REAL(C, ldc * i + j) = beta_real * Cij_real - beta_imag * Cij_imag;

            IMAG(C, ldc * i + j) = beta_real * Cij_imag + beta_imag * Cij_real;

          }

        }

      }

    }

    if (alpha_real == 0.0 && alpha_imag == 0.0)

      return;

    if (uplo == CblasUpper && trans == CblasNoTrans) {

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

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

          BASE temp_real = 0.0;

          BASE temp_imag = 0.0;

          for (k = 0; k < K; k++) {

            const BASE Aik_real = CONST_REAL(A, i * lda + k);

            const BASE Aik_imag = CONST_IMAG(A, i * lda + k);

            const BASE Ajk_real = CONST_REAL(A, j * lda + k);

            const BASE Ajk_imag = CONST_IMAG(A, j * lda + k);

            temp_real += Aik_real * Ajk_real - Aik_imag * Ajk_imag;

            temp_imag += Aik_real * Ajk_imag + Aik_imag * Ajk_real;

          }

          REAL(C, i * ldc + j) += alpha_real * temp_real - alpha_imag * temp_imag;

          IMAG(C, i * ldc + j) += alpha_real * temp_imag + alpha_imag * temp_real;

        }

      }

    } else if (uplo == CblasUpper && trans == CblasTrans) {

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

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

          BASE temp_real = 0.0;

          BASE temp_imag = 0.0;

          for (k = 0; k < K; k++) {

            const BASE Aki_real = CONST_REAL(A, k * lda + i);

            const BASE Aki_imag = CONST_IMAG(A, k * lda + i);

            const BASE Akj_real = CONST_REAL(A, k * lda + j);

            const BASE Akj_imag = CONST_IMAG(A, k * lda + j);

            temp_real += Aki_real * Akj_real - Aki_imag * Akj_imag;

            temp_imag += Aki_real * Akj_imag + Aki_imag * Akj_real;

          }

          REAL(C, i * ldc + j) += alpha_real * temp_real - alpha_imag * temp_imag;

          IMAG(C, i * ldc + j) += alpha_real * temp_imag + alpha_imag * temp_real;

        }

      }

    } else if (uplo == CblasLower && trans == CblasNoTrans) {

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

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

          BASE temp_real = 0.0;

          BASE temp_imag = 0.0;

          for (k = 0; k < K; k++) {

            const BASE Aik_real = CONST_REAL(A, i * lda + k);

            const BASE Aik_imag = CONST_IMAG(A, i * lda + k);

            const BASE Ajk_real = CONST_REAL(A, j * lda + k);

            const BASE Ajk_imag = CONST_IMAG(A, j * lda + k);

            temp_real += Aik_real * Ajk_real - Aik_imag * Ajk_imag;

            temp_imag += Aik_real * Ajk_imag + Aik_imag * Ajk_real;

          }

          REAL(C, i * ldc + j) += alpha_real * temp_real - alpha_imag * temp_imag;

          IMAG(C, i * ldc + j) += alpha_real * temp_imag + alpha_imag * temp_real;

        }

      }

    } else if (uplo == CblasLower && trans == CblasTrans) {

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

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

          BASE temp_real = 0.0;

          BASE temp_imag = 0.0;

          for (k = 0; k < K; k++) {

            const BASE Aki_real = CONST_REAL(A, k * lda + i);

            const BASE Aki_imag = CONST_IMAG(A, k * lda + i);

            const BASE Akj_real = CONST_REAL(A, k * lda + j);

            const BASE Akj_imag = CONST_IMAG(A, k * lda + j);

            temp_real += Aki_real * Akj_real - Aki_imag * Akj_imag;

            temp_imag += Aki_real * Akj_imag + Aki_imag * Akj_real;

          }

          REAL(C, i * ldc + j) += alpha_real * temp_real - alpha_imag * temp_imag;

          IMAG(C, i * ldc + j) += alpha_real * temp_imag + alpha_imag * temp_real;

        }

      }

    } else {

      BLAS_ERROR("unrecognized operation");

    }

  }

}