diff options
Diffstat (limited to 'gsl-1.9/cblas/source_axpy_r.h')
-rw-r--r-- | gsl-1.9/cblas/source_axpy_r.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/gsl-1.9/cblas/source_axpy_r.h b/gsl-1.9/cblas/source_axpy_r.h new file mode 100644 index 0000000..8e38448 --- /dev/null +++ b/gsl-1.9/cblas/source_axpy_r.h @@ -0,0 +1,50 @@ +/* blas/source_axpy_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 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; + + if (alpha == 0.0) { + return; + } + + if (incX == 1 && incY == 1) { + const INDEX m = N % 4; + + for (i = 0; i < m; i++) { + Y[i] += alpha * X[i]; + } + + for (i = m; i + 3 < N; i += 4) { + Y[i] += alpha * X[i]; + Y[i + 1] += alpha * X[i + 1]; + Y[i + 2] += alpha * X[i + 2]; + Y[i + 3] += alpha * X[i + 3]; + } + } else { + INDEX ix = OFFSET(N, incX); + INDEX iy = OFFSET(N, incY); + + for (i = 0; i < N; i++) { + Y[iy] += alpha * X[ix]; + ix += incX; + iy += incY; + } + } +} |