| /* |
| * NEON scaling |
| * Copyright (C) 2012,2013 Thomas Tsou <tom@tsou.cc> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library 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 |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <malloc.h> |
| #include <string.h> |
| #include <scale.h> |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| void neon_scale_4n(float *, float *, float *, int); |
| |
| static void scale_ps(float *out, float *in, float *scale, int len) |
| { |
| float ai, aq, bi, bq; |
| |
| bi = scale[0]; |
| bq = scale[1]; |
| |
| for (int i = 0; i < len; i++) { |
| ai = in[2 * i + 0]; |
| aq = in[2 * i + 1]; |
| |
| out[2 * i + 0] = ai * bi - aq * bq; |
| out[2 * i + 1] = ai * bq + aq * bi; |
| } |
| } |
| |
| void scale_complex(float *out, float *in, float* scale, int len) |
| { |
| #ifdef HAVE_NEON |
| if (len % 4) |
| scale_ps(out, in, scale, len); |
| else |
| neon_scale_4n(in, scale, out, len >> 2); |
| #else |
| scale_ps(out, in, scale, len); |
| #endif |
| } |