2 * This file is part of FFmpeg.
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.
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.
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
20 #include "libavutil/attributes.h"
21 #include "libavutil/cpu.h"
22 #include "libavutil/x86/cpu.h"
25 av_cold
void ff_fft_init_x86(FFTContext
*s
)
27 int cpu_flags
= av_get_cpu_flags();
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
;
36 if (EXTERNAL_AMD3DNOWEXT(cpu_flags
)) {
38 s
->imdct_calc
= ff_imdct_calc_3dnowext
;
39 s
->imdct_half
= ff_imdct_half_3dnowext
;
40 s
->fft_calc
= ff_fft_calc_3dnowext
;
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
;
51 if (EXTERNAL_AVX(cpu_flags
) && s
->nbits
>= 5) {
53 s
->imdct_half
= ff_imdct_half_avx
;
54 s
->fft_calc
= ff_fft_calc_avx
;
55 s
->fft_permutation
= FF_FFT_PERM_AVX
;