1 /*
2 * Copyright (c) 2012
3 * MIPS Technologies, Inc., California.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * Author: Stanislav Ocovaj (socovaj@mips.com)
30 * Author: Zoran Lukic (zoranl@mips.com)
31 *
32 * Optimized MDCT/IMDCT and FFT transforms
33 *
34 * This file is part of FFmpeg.
35 *
36 * FFmpeg is free software; you can redistribute it and/or
37 * modify it under the terms of the GNU Lesser General Public
38 * License as published by the Free Software Foundation; either
39 * version 2.1 of the License, or (at your option) any later version.
40 *
41 * FFmpeg is distributed in the hope that it will be useful,
42 * but WITHOUT ANY WARRANTY; without even the implied warranty of
43 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
44 * Lesser General Public License for more details.
45 *
46 * You should have received a copy of the GNU Lesser General Public
47 * License along with FFmpeg; if not, write to the Free Software
48 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
49 */
50 #include "config.h"
51 #include "libavcodec/fft.h"
52 #include "libavcodec/fft_table.h"
53 #include "libavutil/mips/asmdefs.h"
54
55 /**
56 * FFT transform
57 */
58
59 #if HAVE_INLINE_ASM
60 #if !HAVE_MIPS32R6 && !HAVE_MIPS64R6
ff_fft_calc_mips(FFTContext * s,FFTComplex * z)61 static void ff_fft_calc_mips(FFTContext *s, FFTComplex *z)
62 {
63 int nbits, i, n, num_transforms, offset, step;
64 int n4, n2, n34;
65 FFTSample tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8;
66 FFTComplex *tmpz;
67 float w_re, w_im;
68 float *w_re_ptr, *w_im_ptr;
69 const int fft_size = (1 << s->nbits);
70 float pom, pom1, pom2, pom3;
71 float temp, temp1, temp3, temp4;
72 FFTComplex * tmpz_n2, * tmpz_n34, * tmpz_n4;
73 FFTComplex * tmpz_n2_i, * tmpz_n34_i, * tmpz_n4_i, * tmpz_i;
74 float f1 = 0.7071067812;
75
76 num_transforms = (21845 >> (17 - s->nbits)) | 1;
77
78 for (n=0; n<num_transforms; n++) {
79 offset = ff_fft_offsets_lut[n] << 2;
80 tmpz = z + offset;
81
82 tmp1 = tmpz[0].re + tmpz[1].re;
83 tmp5 = tmpz[2].re + tmpz[3].re;
84 tmp2 = tmpz[0].im + tmpz[1].im;
85 tmp6 = tmpz[2].im + tmpz[3].im;
86 tmp3 = tmpz[0].re - tmpz[1].re;
87 tmp8 = tmpz[2].im - tmpz[3].im;
88 tmp4 = tmpz[0].im - tmpz[1].im;
89 tmp7 = tmpz[2].re - tmpz[3].re;
90
91 tmpz[0].re = tmp1 + tmp5;
92 tmpz[2].re = tmp1 - tmp5;
93 tmpz[0].im = tmp2 + tmp6;
94 tmpz[2].im = tmp2 - tmp6;
95 tmpz[1].re = tmp3 + tmp8;
96 tmpz[3].re = tmp3 - tmp8;
97 tmpz[1].im = tmp4 - tmp7;
98 tmpz[3].im = tmp4 + tmp7;
99
100 }
101
102 if (fft_size < 8)
103 return;
104
105 num_transforms = (num_transforms >> 1) | 1;
106
107 for (n=0; n<num_transforms; n++) {
108 offset = ff_fft_offsets_lut[n] << 3;
109 tmpz = z + offset;
110
111 __asm__ volatile (
112 "lwc1 %[tmp1], 32(%[tmpz]) \n\t"
113 "lwc1 %[pom], 40(%[tmpz]) \n\t"
114 "lwc1 %[tmp3], 48(%[tmpz]) \n\t"
115 "lwc1 %[pom1], 56(%[tmpz]) \n\t"
116 "lwc1 %[tmp2], 36(%[tmpz]) \n\t"
117 "lwc1 %[pom2], 44(%[tmpz]) \n\t"
118 "lwc1 %[pom3], 60(%[tmpz]) \n\t"
119 "lwc1 %[tmp4], 52(%[tmpz]) \n\t"
120 "add.s %[tmp1], %[tmp1], %[pom] \n\t" // tmp1 = tmpz[4].re + tmpz[5].re;
121 "add.s %[tmp3], %[tmp3], %[pom1] \n\t" // tmp3 = tmpz[6].re + tmpz[7].re;
122 "add.s %[tmp2], %[tmp2], %[pom2] \n\t" // tmp2 = tmpz[4].im + tmpz[5].im;
123 "lwc1 %[pom], 40(%[tmpz]) \n\t"
124 "add.s %[tmp4], %[tmp4], %[pom3] \n\t" // tmp4 = tmpz[6].im + tmpz[7].im;
125 "add.s %[tmp5], %[tmp1], %[tmp3] \n\t" // tmp5 = tmp1 + tmp3;
126 "sub.s %[tmp7], %[tmp1], %[tmp3] \n\t" // tmp7 = tmp1 - tmp3;
127 "lwc1 %[tmp1], 32(%[tmpz]) \n\t"
128 "lwc1 %[pom1], 44(%[tmpz]) \n\t"
129 "add.s %[tmp6], %[tmp2], %[tmp4] \n\t" // tmp6 = tmp2 + tmp4;
130 "sub.s %[tmp8], %[tmp2], %[tmp4] \n\t" // tmp8 = tmp2 - tmp4;
131 "lwc1 %[tmp2], 36(%[tmpz]) \n\t"
132 "lwc1 %[pom2], 56(%[tmpz]) \n\t"
133 "lwc1 %[pom3], 60(%[tmpz]) \n\t"
134 "lwc1 %[tmp3], 48(%[tmpz]) \n\t"
135 "lwc1 %[tmp4], 52(%[tmpz]) \n\t"
136 "sub.s %[tmp1], %[tmp1], %[pom] \n\t" // tmp1 = tmpz[4].re - tmpz[5].re;
137 "lwc1 %[pom], 0(%[tmpz]) \n\t"
138 "sub.s %[tmp2], %[tmp2], %[pom1] \n\t" // tmp2 = tmpz[4].im - tmpz[5].im;
139 "sub.s %[tmp3], %[tmp3], %[pom2] \n\t" // tmp3 = tmpz[6].re - tmpz[7].re;
140 "lwc1 %[pom2], 4(%[tmpz]) \n\t"
141 "sub.s %[pom1], %[pom], %[tmp5] \n\t"
142 "sub.s %[tmp4], %[tmp4], %[pom3] \n\t" // tmp4 = tmpz[6].im - tmpz[7].im;
143 "add.s %[pom3], %[pom], %[tmp5] \n\t"
144 "sub.s %[pom], %[pom2], %[tmp6] \n\t"
145 "add.s %[pom2], %[pom2], %[tmp6] \n\t"
146 "swc1 %[pom1], 32(%[tmpz]) \n\t" // tmpz[4].re = tmpz[0].re - tmp5;
147 "swc1 %[pom3], 0(%[tmpz]) \n\t" // tmpz[0].re = tmpz[0].re + tmp5;
148 "swc1 %[pom], 36(%[tmpz]) \n\t" // tmpz[4].im = tmpz[0].im - tmp6;
149 "swc1 %[pom2], 4(%[tmpz]) \n\t" // tmpz[0].im = tmpz[0].im + tmp6;
150 "lwc1 %[pom1], 16(%[tmpz]) \n\t"
151 "lwc1 %[pom3], 20(%[tmpz]) \n\t"
152 "add.s %[temp1],%[tmp1], %[tmp2] \n\t"
153 "sub.s %[temp], %[pom1], %[tmp8] \n\t"
154 "add.s %[pom2], %[pom3], %[tmp7] \n\t"
155 "sub.s %[temp3],%[tmp3], %[tmp4] \n\t"
156 "sub.s %[temp4],%[tmp2], %[tmp1] \n\t"
157 "swc1 %[temp], 48(%[tmpz]) \n\t" // tmpz[6].re = tmpz[2].re - tmp8;
158 "swc1 %[pom2], 52(%[tmpz]) \n\t" // tmpz[6].im = tmpz[2].im + tmp7;
159 "add.s %[pom1], %[pom1], %[tmp8] \n\t"
160 "sub.s %[pom3], %[pom3], %[tmp7] \n\t"
161 "add.s %[tmp3], %[tmp3], %[tmp4] \n\t"
162 "mul.s %[tmp5], %[f1], %[temp1] \n\t" // tmp5 = pom * (tmp1 + tmp2);
163 "mul.s %[tmp7], %[f1], %[temp3] \n\t" // tmp7 = pom * (tmp3 - tmp4);
164 "mul.s %[tmp6], %[f1], %[temp4] \n\t" // tmp6 = pom * (tmp2 - tmp1);
165 "mul.s %[tmp8], %[f1], %[tmp3] \n\t" // tmp8 = pom * (tmp3 + tmp4);
166 "swc1 %[pom1], 16(%[tmpz]) \n\t" // tmpz[2].re = tmpz[2].re + tmp8;
167 "swc1 %[pom3], 20(%[tmpz]) \n\t" // tmpz[2].im = tmpz[2].im - tmp7;
168 "add.s %[tmp1], %[tmp5], %[tmp7] \n\t" // tmp1 = tmp5 + tmp7;
169 "sub.s %[tmp3], %[tmp5], %[tmp7] \n\t" // tmp3 = tmp5 - tmp7;
170 "add.s %[tmp2], %[tmp6], %[tmp8] \n\t" // tmp2 = tmp6 + tmp8;
171 "sub.s %[tmp4], %[tmp6], %[tmp8] \n\t" // tmp4 = tmp6 - tmp8;
172 "lwc1 %[temp], 8(%[tmpz]) \n\t"
173 "lwc1 %[temp1],12(%[tmpz]) \n\t"
174 "lwc1 %[pom], 24(%[tmpz]) \n\t"
175 "lwc1 %[pom2], 28(%[tmpz]) \n\t"
176 "sub.s %[temp4],%[temp], %[tmp1] \n\t"
177 "sub.s %[temp3],%[temp1], %[tmp2] \n\t"
178 "add.s %[temp], %[temp], %[tmp1] \n\t"
179 "add.s %[temp1],%[temp1], %[tmp2] \n\t"
180 "sub.s %[pom1], %[pom], %[tmp4] \n\t"
181 "add.s %[pom3], %[pom2], %[tmp3] \n\t"
182 "add.s %[pom], %[pom], %[tmp4] \n\t"
183 "sub.s %[pom2], %[pom2], %[tmp3] \n\t"
184 "swc1 %[temp4],40(%[tmpz]) \n\t" // tmpz[5].re = tmpz[1].re - tmp1;
185 "swc1 %[temp3],44(%[tmpz]) \n\t" // tmpz[5].im = tmpz[1].im - tmp2;
186 "swc1 %[temp], 8(%[tmpz]) \n\t" // tmpz[1].re = tmpz[1].re + tmp1;
187 "swc1 %[temp1],12(%[tmpz]) \n\t" // tmpz[1].im = tmpz[1].im + tmp2;
188 "swc1 %[pom1], 56(%[tmpz]) \n\t" // tmpz[7].re = tmpz[3].re - tmp4;
189 "swc1 %[pom3], 60(%[tmpz]) \n\t" // tmpz[7].im = tmpz[3].im + tmp3;
190 "swc1 %[pom], 24(%[tmpz]) \n\t" // tmpz[3].re = tmpz[3].re + tmp4;
191 "swc1 %[pom2], 28(%[tmpz]) \n\t" // tmpz[3].im = tmpz[3].im - tmp3;
192 : [tmp1]"=&f"(tmp1), [pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2),
193 [tmp3]"=&f"(tmp3), [tmp2]"=&f"(tmp2), [tmp4]"=&f"(tmp4), [tmp5]"=&f"(tmp5), [tmp7]"=&f"(tmp7),
194 [tmp6]"=&f"(tmp6), [tmp8]"=&f"(tmp8), [pom3]"=&f"(pom3),[temp]"=&f"(temp), [temp1]"=&f"(temp1),
195 [temp3]"=&f"(temp3), [temp4]"=&f"(temp4)
196 : [tmpz]"r"(tmpz), [f1]"f"(f1)
197 : "memory"
198 );
199 }
200
201 step = 1 << (MAX_LOG2_NFFT - 4);
202 n4 = 4;
203
204 for (nbits=4; nbits<=s->nbits; nbits++) {
205 num_transforms = (num_transforms >> 1) | 1;
206 n2 = 2 * n4;
207 n34 = 3 * n4;
208
209 for (n=0; n<num_transforms; n++) {
210 offset = ff_fft_offsets_lut[n] << nbits;
211 tmpz = z + offset;
212
213 tmpz_n2 = tmpz + n2;
214 tmpz_n4 = tmpz + n4;
215 tmpz_n34 = tmpz + n34;
216
217 __asm__ volatile (
218 "lwc1 %[pom1], 0(%[tmpz_n2]) \n\t"
219 "lwc1 %[pom], 0(%[tmpz_n34]) \n\t"
220 "lwc1 %[pom2], 4(%[tmpz_n2]) \n\t"
221 "lwc1 %[pom3], 4(%[tmpz_n34]) \n\t"
222 "lwc1 %[temp1],0(%[tmpz]) \n\t"
223 "lwc1 %[temp3],4(%[tmpz]) \n\t"
224 "add.s %[tmp5], %[pom1], %[pom] \n\t" // tmp5 = tmpz[ n2].re + tmpz[n34].re;
225 "sub.s %[tmp1], %[pom1], %[pom] \n\t" // tmp1 = tmpz[ n2].re - tmpz[n34].re;
226 "add.s %[tmp6], %[pom2], %[pom3] \n\t" // tmp6 = tmpz[ n2].im + tmpz[n34].im;
227 "sub.s %[tmp2], %[pom2], %[pom3] \n\t" // tmp2 = tmpz[ n2].im - tmpz[n34].im;
228 "sub.s %[temp], %[temp1], %[tmp5] \n\t"
229 "add.s %[temp1],%[temp1], %[tmp5] \n\t"
230 "sub.s %[temp4],%[temp3], %[tmp6] \n\t"
231 "add.s %[temp3],%[temp3], %[tmp6] \n\t"
232 "swc1 %[temp], 0(%[tmpz_n2]) \n\t" // tmpz[ n2].re = tmpz[ 0].re - tmp5;
233 "swc1 %[temp1],0(%[tmpz]) \n\t" // tmpz[ 0].re = tmpz[ 0].re + tmp5;
234 "lwc1 %[pom1], 0(%[tmpz_n4]) \n\t"
235 "swc1 %[temp4],4(%[tmpz_n2]) \n\t" // tmpz[ n2].im = tmpz[ 0].im - tmp6;
236 "lwc1 %[temp], 4(%[tmpz_n4]) \n\t"
237 "swc1 %[temp3],4(%[tmpz]) \n\t" // tmpz[ 0].im = tmpz[ 0].im + tmp6;
238 "sub.s %[pom], %[pom1], %[tmp2] \n\t"
239 "add.s %[pom1], %[pom1], %[tmp2] \n\t"
240 "add.s %[temp1],%[temp], %[tmp1] \n\t"
241 "sub.s %[temp], %[temp], %[tmp1] \n\t"
242 "swc1 %[pom], 0(%[tmpz_n34]) \n\t" // tmpz[n34].re = tmpz[n4].re - tmp2;
243 "swc1 %[pom1], 0(%[tmpz_n4]) \n\t" // tmpz[ n4].re = tmpz[n4].re + tmp2;
244 "swc1 %[temp1],4(%[tmpz_n34]) \n\t" // tmpz[n34].im = tmpz[n4].im + tmp1;
245 "swc1 %[temp], 4(%[tmpz_n4]) \n\t" // tmpz[ n4].im = tmpz[n4].im - tmp1;
246 : [tmp5]"=&f"(tmp5),
247 [tmp1]"=&f"(tmp1), [pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2),
248 [tmp2]"=&f"(tmp2), [tmp6]"=&f"(tmp6), [pom3]"=&f"(pom3),
249 [temp]"=&f"(temp), [temp1]"=&f"(temp1), [temp3]"=&f"(temp3), [temp4]"=&f"(temp4)
250 : [tmpz]"r"(tmpz), [tmpz_n2]"r"(tmpz_n2), [tmpz_n34]"r"(tmpz_n34), [tmpz_n4]"r"(tmpz_n4)
251 : "memory"
252 );
253
254 w_re_ptr = (float*)(ff_cos_131072 + step);
255 w_im_ptr = (float*)(ff_cos_131072 + MAX_FFT_SIZE/4 - step);
256
257 for (i=1; i<n4; i++) {
258 w_re = w_re_ptr[0];
259 w_im = w_im_ptr[0];
260 tmpz_n2_i = tmpz_n2 + i;
261 tmpz_n4_i = tmpz_n4 + i;
262 tmpz_n34_i= tmpz_n34 + i;
263 tmpz_i = tmpz + i;
264
265 __asm__ volatile (
266 "lwc1 %[temp], 0(%[tmpz_n2_i]) \n\t"
267 "lwc1 %[temp1], 4(%[tmpz_n2_i]) \n\t"
268 "lwc1 %[pom], 0(%[tmpz_n34_i]) \n\t"
269 "lwc1 %[pom1], 4(%[tmpz_n34_i]) \n\t"
270 "mul.s %[temp3], %[w_im], %[temp] \n\t"
271 "mul.s %[temp4], %[w_im], %[temp1] \n\t"
272 "mul.s %[pom2], %[w_im], %[pom1] \n\t"
273 "mul.s %[pom3], %[w_im], %[pom] \n\t"
274 "msub.s %[tmp2], %[temp3], %[w_re], %[temp1] \n\t" // tmp2 = w_re * tmpz[ n2+i].im - w_im * tmpz[ n2+i].re;
275 "madd.s %[tmp1], %[temp4], %[w_re], %[temp] \n\t" // tmp1 = w_re * tmpz[ n2+i].re + w_im * tmpz[ n2+i].im;
276 "msub.s %[tmp3], %[pom2], %[w_re], %[pom] \n\t" // tmp3 = w_re * tmpz[n34+i].re - w_im * tmpz[n34+i].im;
277 "madd.s %[tmp4], %[pom3], %[w_re], %[pom1] \n\t" // tmp4 = w_re * tmpz[n34+i].im + w_im * tmpz[n34+i].re;
278 "lwc1 %[temp], 0(%[tmpz_i]) \n\t"
279 "lwc1 %[pom], 4(%[tmpz_i]) \n\t"
280 "add.s %[tmp5], %[tmp1], %[tmp3] \n\t" // tmp5 = tmp1 + tmp3;
281 "sub.s %[tmp1], %[tmp1], %[tmp3] \n\t" // tmp1 = tmp1 - tmp3;
282 "add.s %[tmp6], %[tmp2], %[tmp4] \n\t" // tmp6 = tmp2 + tmp4;
283 "sub.s %[tmp2], %[tmp2], %[tmp4] \n\t" // tmp2 = tmp2 - tmp4;
284 "sub.s %[temp1], %[temp], %[tmp5] \n\t"
285 "add.s %[temp], %[temp], %[tmp5] \n\t"
286 "sub.s %[pom1], %[pom], %[tmp6] \n\t"
287 "add.s %[pom], %[pom], %[tmp6] \n\t"
288 "lwc1 %[temp3], 0(%[tmpz_n4_i]) \n\t"
289 "lwc1 %[pom2], 4(%[tmpz_n4_i]) \n\t"
290 "swc1 %[temp1], 0(%[tmpz_n2_i]) \n\t" // tmpz[ n2+i].re = tmpz[ i].re - tmp5;
291 "swc1 %[temp], 0(%[tmpz_i]) \n\t" // tmpz[ i].re = tmpz[ i].re + tmp5;
292 "swc1 %[pom1], 4(%[tmpz_n2_i]) \n\t" // tmpz[ n2+i].im = tmpz[ i].im - tmp6;
293 "swc1 %[pom] , 4(%[tmpz_i]) \n\t" // tmpz[ i].im = tmpz[ i].im + tmp6;
294 "sub.s %[temp4], %[temp3], %[tmp2] \n\t"
295 "add.s %[pom3], %[pom2], %[tmp1] \n\t"
296 "add.s %[temp3], %[temp3], %[tmp2] \n\t"
297 "sub.s %[pom2], %[pom2], %[tmp1] \n\t"
298 "swc1 %[temp4], 0(%[tmpz_n34_i]) \n\t" // tmpz[n34+i].re = tmpz[n4+i].re - tmp2;
299 "swc1 %[pom3], 4(%[tmpz_n34_i]) \n\t" // tmpz[n34+i].im = tmpz[n4+i].im + tmp1;
300 "swc1 %[temp3], 0(%[tmpz_n4_i]) \n\t" // tmpz[ n4+i].re = tmpz[n4+i].re + tmp2;
301 "swc1 %[pom2], 4(%[tmpz_n4_i]) \n\t" // tmpz[ n4+i].im = tmpz[n4+i].im - tmp1;
302 : [tmp1]"=&f"(tmp1), [tmp2]"=&f" (tmp2), [temp]"=&f"(temp), [tmp3]"=&f"(tmp3),
303 [tmp4]"=&f"(tmp4), [tmp5]"=&f"(tmp5), [tmp6]"=&f"(tmp6),
304 [temp1]"=&f"(temp1), [temp3]"=&f"(temp3), [temp4]"=&f"(temp4),
305 [pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2), [pom3]"=&f"(pom3)
306 : [w_re]"f"(w_re), [w_im]"f"(w_im),
307 [tmpz_i]"r"(tmpz_i),[tmpz_n2_i]"r"(tmpz_n2_i),
308 [tmpz_n34_i]"r"(tmpz_n34_i), [tmpz_n4_i]"r"(tmpz_n4_i)
309 : "memory"
310 );
311 w_re_ptr += step;
312 w_im_ptr -= step;
313 }
314 }
315 step >>= 1;
316 n4 <<= 1;
317 }
318 }
319
320 /**
321 * MDCT/IMDCT transforms.
322 */
323
ff_imdct_half_mips(FFTContext * s,FFTSample * output,const FFTSample * input)324 static void ff_imdct_half_mips(FFTContext *s, FFTSample *output, const FFTSample *input)
325 {
326 int k, n8, n4, n2, n, j;
327 const uint16_t *revtab = s->revtab;
328 const FFTSample *tcos = s->tcos;
329 const FFTSample *tsin = s->tsin;
330 const FFTSample *in1, *in2, *in3, *in4;
331 FFTComplex *z = (FFTComplex *)output;
332
333 int j1;
334 const float *tcos1, *tsin1, *tcos2, *tsin2;
335 float temp1, temp2, temp3, temp4, temp5, temp6, temp7, temp8,
336 temp9, temp10, temp11, temp12, temp13, temp14, temp15, temp16;
337 FFTComplex *z1, *z2;
338
339 n = 1 << s->mdct_bits;
340 n2 = n >> 1;
341 n4 = n >> 2;
342 n8 = n >> 3;
343
344 /* pre rotation */
345 in1 = input;
346 in2 = input + n2 - 1;
347 in3 = input + 2;
348 in4 = input + n2 - 3;
349
350 tcos1 = tcos;
351 tsin1 = tsin;
352
353 /* n4 = 64 or 128 */
354 for(k = 0; k < n4; k += 2) {
355 j = revtab[k ];
356 j1 = revtab[k + 1];
357
358 __asm__ volatile (
359 "lwc1 %[temp1], 0(%[in2]) \t\n"
360 "lwc1 %[temp2], 0(%[tcos1]) \t\n"
361 "lwc1 %[temp3], 0(%[tsin1]) \t\n"
362 "lwc1 %[temp4], 0(%[in1]) \t\n"
363 "lwc1 %[temp5], 0(%[in4]) \t\n"
364 "mul.s %[temp9], %[temp1], %[temp2] \t\n"
365 "mul.s %[temp10], %[temp1], %[temp3] \t\n"
366 "lwc1 %[temp6], 4(%[tcos1]) \t\n"
367 "lwc1 %[temp7], 4(%[tsin1]) \t\n"
368 "nmsub.s %[temp9], %[temp9], %[temp4], %[temp3] \t\n"
369 "madd.s %[temp10], %[temp10], %[temp4], %[temp2] \t\n"
370 "mul.s %[temp11], %[temp5], %[temp6] \t\n"
371 "mul.s %[temp12], %[temp5], %[temp7] \t\n"
372 "lwc1 %[temp8], 0(%[in3]) \t\n"
373 PTR_ADDIU " %[tcos1], %[tcos1], 8 \t\n"
374 PTR_ADDIU " %[tsin1], %[tsin1], 8 \t\n"
375 PTR_ADDIU " %[in1], %[in1], 16 \t\n"
376 "nmsub.s %[temp11], %[temp11], %[temp8], %[temp7] \t\n"
377 "madd.s %[temp12], %[temp12], %[temp8], %[temp6] \t\n"
378 PTR_ADDIU " %[in2], %[in2], -16 \t\n"
379 PTR_ADDIU " %[in3], %[in3], 16 \t\n"
380 PTR_ADDIU " %[in4], %[in4], -16 \t\n"
381
382 : [temp1]"=&f"(temp1), [temp2]"=&f"(temp2),
383 [temp3]"=&f"(temp3), [temp4]"=&f"(temp4),
384 [temp5]"=&f"(temp5), [temp6]"=&f"(temp6),
385 [temp7]"=&f"(temp7), [temp8]"=&f"(temp8),
386 [temp9]"=&f"(temp9), [temp10]"=&f"(temp10),
387 [temp11]"=&f"(temp11), [temp12]"=&f"(temp12),
388 [tsin1]"+r"(tsin1), [tcos1]"+r"(tcos1),
389 [in1]"+r"(in1), [in2]"+r"(in2),
390 [in3]"+r"(in3), [in4]"+r"(in4)
391 :
392 : "memory"
393 );
394
395 z[j ].re = temp9;
396 z[j ].im = temp10;
397 z[j1].re = temp11;
398 z[j1].im = temp12;
399 }
400
401 s->fft_calc(s, z);
402
403 /* post rotation + reordering */
404 /* n8 = 32 or 64 */
405 for(k = 0; k < n8; k += 2) {
406 tcos1 = &tcos[n8 - k - 2];
407 tsin1 = &tsin[n8 - k - 2];
408 tcos2 = &tcos[n8 + k];
409 tsin2 = &tsin[n8 + k];
410 z1 = &z[n8 - k - 2];
411 z2 = &z[n8 + k ];
412
413 __asm__ volatile (
414 "lwc1 %[temp1], 12(%[z1]) \t\n"
415 "lwc1 %[temp2], 4(%[tsin1]) \t\n"
416 "lwc1 %[temp3], 4(%[tcos1]) \t\n"
417 "lwc1 %[temp4], 8(%[z1]) \t\n"
418 "lwc1 %[temp5], 4(%[z1]) \t\n"
419 "mul.s %[temp9], %[temp1], %[temp2] \t\n"
420 "mul.s %[temp10], %[temp1], %[temp3] \t\n"
421 "lwc1 %[temp6], 0(%[tsin1]) \t\n"
422 "lwc1 %[temp7], 0(%[tcos1]) \t\n"
423 "nmsub.s %[temp9], %[temp9], %[temp4], %[temp3] \t\n"
424 "madd.s %[temp10], %[temp10], %[temp4], %[temp2] \t\n"
425 "mul.s %[temp11], %[temp5], %[temp6] \t\n"
426 "mul.s %[temp12], %[temp5], %[temp7] \t\n"
427 "lwc1 %[temp8], 0(%[z1]) \t\n"
428 "lwc1 %[temp1], 4(%[z2]) \t\n"
429 "lwc1 %[temp2], 0(%[tsin2]) \t\n"
430 "lwc1 %[temp3], 0(%[tcos2]) \t\n"
431 "nmsub.s %[temp11], %[temp11], %[temp8], %[temp7] \t\n"
432 "madd.s %[temp12], %[temp12], %[temp8], %[temp6] \t\n"
433 "mul.s %[temp13], %[temp1], %[temp2] \t\n"
434 "mul.s %[temp14], %[temp1], %[temp3] \t\n"
435 "lwc1 %[temp4], 0(%[z2]) \t\n"
436 "lwc1 %[temp5], 12(%[z2]) \t\n"
437 "lwc1 %[temp6], 4(%[tsin2]) \t\n"
438 "lwc1 %[temp7], 4(%[tcos2]) \t\n"
439 "nmsub.s %[temp13], %[temp13], %[temp4], %[temp3] \t\n"
440 "madd.s %[temp14], %[temp14], %[temp4], %[temp2] \t\n"
441 "mul.s %[temp15], %[temp5], %[temp6] \t\n"
442 "mul.s %[temp16], %[temp5], %[temp7] \t\n"
443 "lwc1 %[temp8], 8(%[z2]) \t\n"
444 "nmsub.s %[temp15], %[temp15], %[temp8], %[temp7] \t\n"
445 "madd.s %[temp16], %[temp16], %[temp8], %[temp6] \t\n"
446 : [temp1]"=&f"(temp1), [temp2]"=&f"(temp2),
447 [temp3]"=&f"(temp3), [temp4]"=&f"(temp4),
448 [temp5]"=&f"(temp5), [temp6]"=&f"(temp6),
449 [temp7]"=&f"(temp7), [temp8]"=&f"(temp8),
450 [temp9]"=&f"(temp9), [temp10]"=&f"(temp10),
451 [temp11]"=&f"(temp11), [temp12]"=&f"(temp12),
452 [temp13]"=&f"(temp13), [temp14]"=&f"(temp14),
453 [temp15]"=&f"(temp15), [temp16]"=&f"(temp16)
454 : [z1]"r"(z1), [z2]"r"(z2),
455 [tsin1]"r"(tsin1), [tcos1]"r"(tcos1),
456 [tsin2]"r"(tsin2), [tcos2]"r"(tcos2)
457 : "memory"
458 );
459
460 z1[1].re = temp9;
461 z1[1].im = temp14;
462 z2[0].re = temp13;
463 z2[0].im = temp10;
464
465 z1[0].re = temp11;
466 z1[0].im = temp16;
467 z2[1].re = temp15;
468 z2[1].im = temp12;
469 }
470 }
471
472 /**
473 * Compute inverse MDCT of size N = 2^nbits
474 * @param output N samples
475 * @param input N/2 samples
476 */
ff_imdct_calc_mips(FFTContext * s,FFTSample * output,const FFTSample * input)477 static void ff_imdct_calc_mips(FFTContext *s, FFTSample *output, const FFTSample *input)
478 {
479 int k;
480 int n = 1 << s->mdct_bits;
481 int n2 = n >> 1;
482 int n4 = n >> 2;
483
484 ff_imdct_half_mips(s, output+n4, input);
485
486 for(k = 0; k < n4; k+=4) {
487 output[k] = -output[n2-k-1];
488 output[k+1] = -output[n2-k-2];
489 output[k+2] = -output[n2-k-3];
490 output[k+3] = -output[n2-k-4];
491
492 output[n-k-1] = output[n2+k];
493 output[n-k-2] = output[n2+k+1];
494 output[n-k-3] = output[n2+k+2];
495 output[n-k-4] = output[n2+k+3];
496 }
497 }
498 #endif /* !HAVE_MIPS32R6 && !HAVE_MIPS64R6 */
499 #endif /* HAVE_INLINE_ASM */
500
ff_fft_init_mips(FFTContext * s)501 av_cold void ff_fft_init_mips(FFTContext *s)
502 {
503 ff_fft_lut_init();
504 ff_init_ff_cos_tabs(17);
505
506 #if HAVE_INLINE_ASM
507 #if !HAVE_MIPS32R6 && !HAVE_MIPS64R6
508 s->fft_calc = ff_fft_calc_mips;
509 #if CONFIG_MDCT
510 s->imdct_calc = ff_imdct_calc_mips;
511 s->imdct_half = ff_imdct_half_mips;
512 #endif
513 #endif
514 #endif
515 }
516