1 /* blas/source_gbmv_r.h
3 * Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or (at
8 * your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
22 INDEX lenX, lenY, L, U;
24 const int Trans = (TransA != CblasConjTrans) ? TransA : CblasTrans;
29 if (alpha == 0.0 && beta == 1.0)
32 if (Trans == CblasNoTrans) {
44 /* form y := beta*y */
46 INDEX iy = OFFSET(lenY, incY);
47 for (i = 0; i < lenY; i++) {
51 } else if (beta != 1.0) {
52 INDEX iy = OFFSET(lenY, incY);
53 for (i = 0; i < lenY; i++) {
62 if ((order == CblasRowMajor && Trans == CblasNoTrans)
63 || (order == CblasColMajor && Trans == CblasTrans)) {
64 /* form y := alpha*A*x + y */
65 INDEX iy = OFFSET(lenY, incY);
66 for (i = 0; i < lenY; i++) {
68 const INDEX j_min = (i > L ? i - L : 0);
69 const INDEX j_max = GSL_MIN(lenX, i + U + 1);
70 INDEX jx = OFFSET(lenX, incX) + j_min * incX;
71 for (j = j_min; j < j_max; j++) {
72 temp += X[jx] * A[(L - i + j) + i * lda];
75 Y[iy] += alpha * temp;
78 } else if ((order == CblasRowMajor && Trans == CblasTrans)
79 || (order == CblasColMajor && Trans == CblasNoTrans)) {
80 /* form y := alpha*A'*x + y */
81 INDEX jx = OFFSET(lenX, incX);
82 for (j = 0; j < lenX; j++) {
83 const BASE temp = alpha * X[jx];
85 const INDEX i_min = (j > U ? j - U : 0);
86 const INDEX i_max = GSL_MIN(lenY, j + L + 1);
87 INDEX iy = OFFSET(lenY, incY) + i_min * incY;
88 for (i = i_min; i < i_max; i++) {
89 Y[iy] += temp * A[lda * j + (U + i - j)];
96 BLAS_ERROR("unrecognized operation");