1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg 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.
8 *
9 * FFmpeg 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.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#include "config.h"
20#include "libavutil/attributes.h"
21#include "libavutil/cpu.h"
22#include "libavutil/x86/cpu.h"
23#include "fft.h"
24
25av_cold void ff_fft_init_x86(FFTContext *s)
26{
27    int cpu_flags = av_get_cpu_flags();
28
29#if ARCH_X86_32
30    if (EXTERNAL_AMD3DNOW(cpu_flags)) {
31        /* 3DNow! for K6-2/3 */
32        s->imdct_calc = ff_imdct_calc_3dnow;
33        s->imdct_half = ff_imdct_half_3dnow;
34        s->fft_calc   = ff_fft_calc_3dnow;
35    }
36    if (EXTERNAL_AMD3DNOWEXT(cpu_flags)) {
37        /* 3DNowEx for K7 */
38        s->imdct_calc = ff_imdct_calc_3dnowext;
39        s->imdct_half = ff_imdct_half_3dnowext;
40        s->fft_calc   = ff_fft_calc_3dnowext;
41    }
42#endif
43    if (EXTERNAL_SSE(cpu_flags)) {
44        /* SSE for P3/P4/K8 */
45        s->imdct_calc  = ff_imdct_calc_sse;
46        s->imdct_half  = ff_imdct_half_sse;
47        s->fft_permute = ff_fft_permute_sse;
48        s->fft_calc    = ff_fft_calc_sse;
49        s->fft_permutation = FF_FFT_PERM_SWAP_LSBS;
50    }
51    if (EXTERNAL_AVX(cpu_flags) && s->nbits >= 5) {
52        /* AVX for SB */
53        s->imdct_half      = ff_imdct_half_avx;
54        s->fft_calc        = ff_fft_calc_avx;
55        s->fft_permutation = FF_FFT_PERM_AVX;
56    }
57}
58