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- /* blas/source_symv.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;
- if (alpha == 0.0 && beta == 1.0)
- return;
- /* form y := beta*y */
- if (beta == 0.0) {
- INDEX iy = OFFSET(N, incY);
- for (i = 0; i < N; i++) {
- Y[iy] = 0.0;
- iy += incY;
- }
- } else if (beta != 1.0) {
- INDEX iy = OFFSET(N, incY);
- for (i = 0; i < N; i++) {
- Y[iy] *= beta;
- iy += incY;
- }
- }
- if (alpha == 0.0)
- return;
- /* form y := alpha*A*x + y */
- if ((order == CblasRowMajor && Uplo == CblasUpper)
- || (order == CblasColMajor && Uplo == CblasLower)) {
- INDEX ix = OFFSET(N, incX);
- INDEX iy = OFFSET(N, incY);
- for (i = 0; i < N; i++) {
- BASE temp1 = alpha * X[ix];
- BASE temp2 = 0.0;
- const INDEX j_min = i + 1;
- const INDEX j_max = N;
- INDEX jx = OFFSET(N, incX) + j_min * incX;
- INDEX jy = OFFSET(N, incY) + j_min * incY;
- Y[iy] += temp1 * A[lda * i + i];
- for (j = j_min; j < j_max; j++) {
- Y[jy] += temp1 * A[lda * i + j];
- temp2 += X[jx] * A[lda * i + j];
- jx += incX;
- jy += incY;
- }
- Y[iy] += alpha * temp2;
- ix += incX;
- iy += incY;
- }
- } else if ((order == CblasRowMajor && Uplo == CblasLower)
- || (order == CblasColMajor && Uplo == CblasUpper)) {
- INDEX ix = OFFSET(N, incX) + (N - 1) * incX;
- INDEX iy = OFFSET(N, incY) + (N - 1) * incY;
- for (i = N; i > 0 && i--;) {
- BASE temp1 = alpha * X[ix];
- BASE temp2 = 0.0;
- const INDEX j_min = 0;
- const INDEX j_max = i;
- INDEX jx = OFFSET(N, incX) + j_min * incX;
- INDEX jy = OFFSET(N, incY) + j_min * incY;
- Y[iy] += temp1 * A[lda * i + i];
- for (j = j_min; j < j_max; j++) {
- Y[jy] += temp1 * A[lda * i + j];
- temp2 += X[jx] * A[lda * i + j];
- jx += incX;
- jy += incY;
- }
- Y[iy] += alpha * temp2;
- ix -= incX;
- iy -= incY;
- }
- } else {
- BLAS_ERROR("unrecognized operation");
- }
- }
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