2 * This file is part of Libav.
4 * Libav is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * Libav is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "libavutil/attributes.h"
22 #include "libavutil/cpu.h"
23 #include "libavutil/x86/cpu.h"
27 av_cold void ff_fft_init_x86(FFTContext *s)
29 int cpu_flags = av_get_cpu_flags();
32 if (EXTERNAL_AMD3DNOW(cpu_flags)) {
33 s->fft_calc = ff_fft_calc_3dnow;
36 if (EXTERNAL_AMD3DNOWEXT(cpu_flags)) {
37 s->fft_calc = ff_fft_calc_3dnowext;
39 #endif /* ARCH_X86_32 */
41 if (EXTERNAL_SSE(cpu_flags)) {
42 s->fft_permute = ff_fft_permute_sse;
43 s->fft_calc = ff_fft_calc_sse;
44 s->fft_permutation = FF_FFT_PERM_SWAP_LSBS;
47 if (EXTERNAL_AVX_FAST(cpu_flags) && s->nbits >= 5) {
48 s->fft_calc = ff_fft_calc_avx;
49 s->fft_permutation = FF_FFT_PERM_AVX;