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- /* blas/source_gbmv_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, j;
- INDEX lenX, lenY, L, U;
- const int Trans = (TransA != CblasConjTrans) ? TransA : CblasTrans;
- if (M == 0 || N == 0)
- return;
- if (alpha == 0.0 && beta == 1.0)
- return;
- if (Trans == CblasNoTrans) {
- lenX = N;
- lenY = M;
- L = KL;
- U = KU;
- } else {
- lenX = M;
- lenY = N;
- L = KU;
- U = KL;
- }
- /* form y := beta*y */
- if (beta == 0.0) {
- INDEX iy = OFFSET(lenY, incY);
- for (i = 0; i < lenY; i++) {
- Y[iy] = 0;
- iy += incY;
- }
- } else if (beta != 1.0) {
- INDEX iy = OFFSET(lenY, incY);
- for (i = 0; i < lenY; i++) {
- Y[iy] *= beta;
- iy += incY;
- }
- }
- if (alpha == 0.0)
- return;
- if ((order == CblasRowMajor && Trans == CblasNoTrans)
- || (order == CblasColMajor && Trans == CblasTrans)) {
- /* form y := alpha*A*x + y */
- INDEX iy = OFFSET(lenY, incY);
- for (i = 0; i < lenY; i++) {
- BASE temp = 0.0;
- const INDEX j_min = (i > L ? i - L : 0);
- const INDEX j_max = GSL_MIN(lenX, i + U + 1);
- INDEX jx = OFFSET(lenX, incX) + j_min * incX;
- for (j = j_min; j < j_max; j++) {
- temp += X[jx] * A[(L - i + j) + i * lda];
- jx += incX;
- }
- Y[iy] += alpha * temp;
- iy += incY;
- }
- } else if ((order == CblasRowMajor && Trans == CblasTrans)
- || (order == CblasColMajor && Trans == CblasNoTrans)) {
- /* form y := alpha*A'*x + y */
- INDEX jx = OFFSET(lenX, incX);
- for (j = 0; j < lenX; j++) {
- const BASE temp = alpha * X[jx];
- if (temp != 0.0) {
- const INDEX i_min = (j > U ? j - U : 0);
- const INDEX i_max = GSL_MIN(lenY, j + L + 1);
- INDEX iy = OFFSET(lenY, incY) + i_min * incY;
- for (i = i_min; i < i_max; i++) {
- Y[iy] += temp * A[lda * j + (U + i - j)];
- iy += incY;
- }
- }
- jx += incX;
- }
- } else {
- BLAS_ERROR("unrecognized operation");
- }
- }
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