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 
21 #include "libavutil/attributes.h"
22 #include "libavutil/cpu.h"
23 #include "libavutil/x86/cpu.h"
24 #include "fft.h"
25 
ff_fft_init_x86(FFTContext * s)26 av_cold void ff_fft_init_x86(FFTContext *s)
27 {
28     int cpu_flags = av_get_cpu_flags();
29 
30 #if ARCH_X86_32
31 #if (HAVE_AMD3DNOW_EXTERNAL == 1)
32     if (EXTERNAL_AMD3DNOW(cpu_flags)) {
33         /* 3DNow! for K6-2/3 */
34         s->imdct_calc = ff_imdct_calc_3dnow;
35         s->imdct_half = ff_imdct_half_3dnow;
36         s->fft_calc   = ff_fft_calc_3dnow;
37     }
38 #endif
39 #if (HAVE_AMD3DNOWEXT_EXTERNAL == 1)
40     if (EXTERNAL_AMD3DNOWEXT(cpu_flags)) {
41         /* 3DNowEx for K7 */
42         s->imdct_calc = ff_imdct_calc_3dnowext;
43         s->imdct_half = ff_imdct_half_3dnowext;
44         s->fft_calc   = ff_fft_calc_3dnowext;
45     }
46 #endif
47 #endif
48 #if (HAVE_SSE_EXTERNAL == 1)
49     if (EXTERNAL_SSE(cpu_flags)) {
50         /* SSE for P3/P4/K8 */
51         s->imdct_calc  = ff_imdct_calc_sse;
52         s->imdct_half  = ff_imdct_half_sse;
53         s->fft_permute = ff_fft_permute_sse;
54         s->fft_calc    = ff_fft_calc_sse;
55         s->fft_permutation = FF_FFT_PERM_SWAP_LSBS;
56     }
57 #endif
58 #if (HAVE_AVX_EXTERNAL == 1)
59     if (EXTERNAL_AVX(cpu_flags) && s->nbits >= 5) {
60         /* AVX for SB */
61         s->imdct_half      = ff_imdct_half_avx;
62         s->fft_calc        = ff_fft_calc_avx;
63         s->fft_permutation = FF_FFT_PERM_AVX;
64     }
65 #endif
66 }
67