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/* blas/source_symm_r.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;
INDEX n1, n2;
int uplo, side;
CHECK_ARGS13(SYMM,Order,Side,Uplo,M,N,alpha,A,lda,B,ldb,beta,C,ldc);
if (alpha == 0.0 && beta == 1.0)
return;
if (Order == CblasRowMajor) {
n1 = M;
n2 = N;
uplo = Uplo;
side = Side;
} else {
n1 = N;
n2 = M;
uplo = (Uplo == CblasUpper) ? CblasLower : CblasUpper;
side = (Side == CblasLeft) ? CblasRight : CblasLeft;
}
/* form y := beta*y */
if (beta == 0.0) {
for (i = 0; i < n1; i++) {
for (j = 0; j < n2; j++) {
C[ldc * i + j] = 0.0;
}
}
} else if (beta != 1.0) {
for (i = 0; i < n1; i++) {
for (j = 0; j < n2; j++) {
C[ldc * i + j] *= beta;
}
}
}
if (alpha == 0.0)
return;
if (side == CblasLeft && uplo == CblasUpper) {
/* form C := alpha*A*B + C */
for (i = 0; i < n1; i++) {
for (j = 0; j < n2; j++) {
const BASE temp1 = alpha * B[ldb * i + j];
BASE temp2 = 0.0;
C[i * ldc + j] += temp1 * A[i * lda + i];
for (k = i + 1; k < n1; k++) {
const BASE Aik = A[i * lda + k];
C[k * ldc + j] += Aik * temp1;
temp2 += Aik * B[ldb * k + j];
}
C[i * ldc + j] += alpha * temp2;
}
}
} else if (side == CblasLeft && uplo == CblasLower) {
/* form C := alpha*A*B + C */
for (i = 0; i < n1; i++) {
for (j = 0; j < n2; j++) {
const BASE temp1 = alpha * B[ldb * i + j];
BASE temp2 = 0.0;
for (k = 0; k < i; k++) {
const BASE Aik = A[i * lda + k];
C[k * ldc + j] += Aik * temp1;
temp2 += Aik * B[ldb * k + j];
}
C[i * ldc + j] += temp1 * A[i * lda + i] + alpha * temp2;
}
}
} else if (side == CblasRight && uplo == CblasUpper) {
/* form C := alpha*B*A + C */
for (i = 0; i < n1; i++) {
for (j = 0; j < n2; j++) {
const BASE temp1 = alpha * B[ldb * i + j];
BASE temp2 = 0.0;
C[i * ldc + j] += temp1 * A[j * lda + j];
for (k = j + 1; k < n2; k++) {
const BASE Ajk = A[j * lda + k];
C[i * ldc + k] += temp1 * Ajk;
temp2 += B[ldb * i + k] * Ajk;
}
C[i * ldc + j] += alpha * temp2;
}
}
} else if (side == CblasRight && uplo == CblasLower) {
/* form C := alpha*B*A + C */
for (i = 0; i < n1; i++) {
for (j = 0; j < n2; j++) {
const BASE temp1 = alpha * B[ldb * i + j];
BASE temp2 = 0.0;
for (k = 0; k < j; k++) {
const BASE Ajk = A[j * lda + k];
C[i * ldc + k] += temp1 * Ajk;
temp2 += B[ldb * i + k] * Ajk;
}
C[i * ldc + j] += temp1 * A[j * lda + j] + alpha * temp2;
}
}
} else {
BLAS_ERROR("unrecognized operation");
}
}
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