| /* 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 2 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"); |
| } |
| } |
