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fft_mips.c
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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 
54 /**
55  * FFT transform
56  */
57 
58 #if HAVE_INLINE_ASM
59 static void ff_fft_calc_mips(FFTContext *s, FFTComplex *z)
60 {
61  int nbits, i, n, num_transforms, offset, step;
62  int n4, n2, n34;
63  FFTSample tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8;
64  FFTComplex *tmpz;
65  float w_re, w_im;
66  float *w_re_ptr, *w_im_ptr;
67  const int fft_size = (1 << s->nbits);
68  int s_n = s->nbits;
69  int tem1, tem2;
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 
75  /**
76  *num_transforms = (0x2aab >> (16 - s->nbits)) | 1;
77  */
78  __asm__ volatile (
79  "li %[tem1], 16 \n\t"
80  "sub %[s_n], %[tem1], %[s_n] \n\t"
81  "li %[tem2], 10923 \n\t"
82  "srav %[tem2], %[tem2], %[s_n] \n\t"
83  "ori %[num_t],%[tem2], 1 \n\t"
84  : [num_t]"=r"(num_transforms), [s_n]"+r"(s_n),
85  [tem1]"=&r"(tem1), [tem2]"=&r"(tem2)
86  );
87 
88 
89  for (n=0; n<num_transforms; n++) {
90  offset = fft_offsets_lut[n] << 2;
91  tmpz = z + offset;
92 
93  tmp1 = tmpz[0].re + tmpz[1].re;
94  tmp5 = tmpz[2].re + tmpz[3].re;
95  tmp2 = tmpz[0].im + tmpz[1].im;
96  tmp6 = tmpz[2].im + tmpz[3].im;
97  tmp3 = tmpz[0].re - tmpz[1].re;
98  tmp8 = tmpz[2].im - tmpz[3].im;
99  tmp4 = tmpz[0].im - tmpz[1].im;
100  tmp7 = tmpz[2].re - tmpz[3].re;
101 
102  tmpz[0].re = tmp1 + tmp5;
103  tmpz[2].re = tmp1 - tmp5;
104  tmpz[0].im = tmp2 + tmp6;
105  tmpz[2].im = tmp2 - tmp6;
106  tmpz[1].re = tmp3 + tmp8;
107  tmpz[3].re = tmp3 - tmp8;
108  tmpz[1].im = tmp4 - tmp7;
109  tmpz[3].im = tmp4 + tmp7;
110 
111  }
112 
113  if (fft_size < 8)
114  return;
115 
116  num_transforms = (num_transforms >> 1) | 1;
117 
118  for (n=0; n<num_transforms; n++) {
119  offset = fft_offsets_lut[n] << 3;
120  tmpz = z + offset;
121 
122  __asm__ volatile (
123  "lwc1 %[tmp1], 32(%[tmpz]) \n\t"
124  "lwc1 %[pom], 40(%[tmpz]) \n\t"
125  "lwc1 %[tmp3], 48(%[tmpz]) \n\t"
126  "lwc1 %[pom1], 56(%[tmpz]) \n\t"
127  "lwc1 %[tmp2], 36(%[tmpz]) \n\t"
128  "lwc1 %[pom2], 44(%[tmpz]) \n\t"
129  "lwc1 %[pom3], 60(%[tmpz]) \n\t"
130  "lwc1 %[tmp4], 52(%[tmpz]) \n\t"
131  "add.s %[tmp1], %[tmp1], %[pom] \n\t" // tmp1 = tmpz[4].re + tmpz[5].re;
132  "add.s %[tmp3], %[tmp3], %[pom1] \n\t" // tmp3 = tmpz[6].re + tmpz[7].re;
133  "add.s %[tmp2], %[tmp2], %[pom2] \n\t" // tmp2 = tmpz[4].im + tmpz[5].im;
134  "lwc1 %[pom], 40(%[tmpz]) \n\t"
135  "add.s %[tmp4], %[tmp4], %[pom3] \n\t" // tmp4 = tmpz[6].im + tmpz[7].im;
136  "add.s %[tmp5], %[tmp1], %[tmp3] \n\t" // tmp5 = tmp1 + tmp3;
137  "sub.s %[tmp7], %[tmp1], %[tmp3] \n\t" // tmp7 = tmp1 - tmp3;
138  "lwc1 %[tmp1], 32(%[tmpz]) \n\t"
139  "lwc1 %[pom1], 44(%[tmpz]) \n\t"
140  "add.s %[tmp6], %[tmp2], %[tmp4] \n\t" // tmp6 = tmp2 + tmp4;
141  "sub.s %[tmp8], %[tmp2], %[tmp4] \n\t" // tmp8 = tmp2 - tmp4;
142  "lwc1 %[tmp2], 36(%[tmpz]) \n\t"
143  "lwc1 %[pom2], 56(%[tmpz]) \n\t"
144  "lwc1 %[pom3], 60(%[tmpz]) \n\t"
145  "lwc1 %[tmp3], 48(%[tmpz]) \n\t"
146  "lwc1 %[tmp4], 52(%[tmpz]) \n\t"
147  "sub.s %[tmp1], %[tmp1], %[pom] \n\t" // tmp1 = tmpz[4].re - tmpz[5].re;
148  "lwc1 %[pom], 0(%[tmpz]) \n\t"
149  "sub.s %[tmp2], %[tmp2], %[pom1] \n\t" // tmp2 = tmpz[4].im - tmpz[5].im;
150  "sub.s %[tmp3], %[tmp3], %[pom2] \n\t" // tmp3 = tmpz[6].re - tmpz[7].re;
151  "lwc1 %[pom2], 4(%[tmpz]) \n\t"
152  "sub.s %[pom1], %[pom], %[tmp5] \n\t"
153  "sub.s %[tmp4], %[tmp4], %[pom3] \n\t" // tmp4 = tmpz[6].im - tmpz[7].im;
154  "add.s %[pom3], %[pom], %[tmp5] \n\t"
155  "sub.s %[pom], %[pom2], %[tmp6] \n\t"
156  "add.s %[pom2], %[pom2], %[tmp6] \n\t"
157  "swc1 %[pom1], 32(%[tmpz]) \n\t" // tmpz[4].re = tmpz[0].re - tmp5;
158  "swc1 %[pom3], 0(%[tmpz]) \n\t" // tmpz[0].re = tmpz[0].re + tmp5;
159  "swc1 %[pom], 36(%[tmpz]) \n\t" // tmpz[4].im = tmpz[0].im - tmp6;
160  "swc1 %[pom2], 4(%[tmpz]) \n\t" // tmpz[0].im = tmpz[0].im + tmp6;
161  "lwc1 %[pom1], 16(%[tmpz]) \n\t"
162  "lwc1 %[pom3], 20(%[tmpz]) \n\t"
163  "li.s %[pom], 0.7071067812 \n\t" // float pom = 0.7071067812f;
164  "add.s %[temp1],%[tmp1], %[tmp2] \n\t"
165  "sub.s %[temp], %[pom1], %[tmp8] \n\t"
166  "add.s %[pom2], %[pom3], %[tmp7] \n\t"
167  "sub.s %[temp3],%[tmp3], %[tmp4] \n\t"
168  "sub.s %[temp4],%[tmp2], %[tmp1] \n\t"
169  "swc1 %[temp], 48(%[tmpz]) \n\t" // tmpz[6].re = tmpz[2].re - tmp8;
170  "swc1 %[pom2], 52(%[tmpz]) \n\t" // tmpz[6].im = tmpz[2].im + tmp7;
171  "add.s %[pom1], %[pom1], %[tmp8] \n\t"
172  "sub.s %[pom3], %[pom3], %[tmp7] \n\t"
173  "add.s %[tmp3], %[tmp3], %[tmp4] \n\t"
174  "mul.s %[tmp5], %[pom], %[temp1] \n\t" // tmp5 = pom * (tmp1 + tmp2);
175  "mul.s %[tmp7], %[pom], %[temp3] \n\t" // tmp7 = pom * (tmp3 - tmp4);
176  "mul.s %[tmp6], %[pom], %[temp4] \n\t" // tmp6 = pom * (tmp2 - tmp1);
177  "mul.s %[tmp8], %[pom], %[tmp3] \n\t" // tmp8 = pom * (tmp3 + tmp4);
178  "swc1 %[pom1], 16(%[tmpz]) \n\t" // tmpz[2].re = tmpz[2].re + tmp8;
179  "swc1 %[pom3], 20(%[tmpz]) \n\t" // tmpz[2].im = tmpz[2].im - tmp7;
180  "add.s %[tmp1], %[tmp5], %[tmp7] \n\t" // tmp1 = tmp5 + tmp7;
181  "sub.s %[tmp3], %[tmp5], %[tmp7] \n\t" // tmp3 = tmp5 - tmp7;
182  "add.s %[tmp2], %[tmp6], %[tmp8] \n\t" // tmp2 = tmp6 + tmp8;
183  "sub.s %[tmp4], %[tmp6], %[tmp8] \n\t" // tmp4 = tmp6 - tmp8;
184  "lwc1 %[temp], 8(%[tmpz]) \n\t"
185  "lwc1 %[temp1],12(%[tmpz]) \n\t"
186  "lwc1 %[pom], 24(%[tmpz]) \n\t"
187  "lwc1 %[pom2], 28(%[tmpz]) \n\t"
188  "sub.s %[temp4],%[temp], %[tmp1] \n\t"
189  "sub.s %[temp3],%[temp1], %[tmp2] \n\t"
190  "add.s %[temp], %[temp], %[tmp1] \n\t"
191  "add.s %[temp1],%[temp1], %[tmp2] \n\t"
192  "sub.s %[pom1], %[pom], %[tmp4] \n\t"
193  "add.s %[pom3], %[pom2], %[tmp3] \n\t"
194  "add.s %[pom], %[pom], %[tmp4] \n\t"
195  "sub.s %[pom2], %[pom2], %[tmp3] \n\t"
196  "swc1 %[temp4],40(%[tmpz]) \n\t" // tmpz[5].re = tmpz[1].re - tmp1;
197  "swc1 %[temp3],44(%[tmpz]) \n\t" // tmpz[5].im = tmpz[1].im - tmp2;
198  "swc1 %[temp], 8(%[tmpz]) \n\t" // tmpz[1].re = tmpz[1].re + tmp1;
199  "swc1 %[temp1],12(%[tmpz]) \n\t" // tmpz[1].im = tmpz[1].im + tmp2;
200  "swc1 %[pom1], 56(%[tmpz]) \n\t" // tmpz[7].re = tmpz[3].re - tmp4;
201  "swc1 %[pom3], 60(%[tmpz]) \n\t" // tmpz[7].im = tmpz[3].im + tmp3;
202  "swc1 %[pom], 24(%[tmpz]) \n\t" // tmpz[3].re = tmpz[3].re + tmp4;
203  "swc1 %[pom2], 28(%[tmpz]) \n\t" // tmpz[3].im = tmpz[3].im - tmp3;
204  : [tmp1]"=&f"(tmp1), [pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2),
205  [tmp3]"=&f"(tmp3), [tmp2]"=&f"(tmp2), [tmp4]"=&f"(tmp4), [tmp5]"=&f"(tmp5), [tmp7]"=&f"(tmp7),
206  [tmp6]"=&f"(tmp6), [tmp8]"=&f"(tmp8), [pom3]"=&f"(pom3),[temp]"=&f"(temp), [temp1]"=&f"(temp1),
207  [temp3]"=&f"(temp3), [temp4]"=&f"(temp4)
208  : [tmpz]"r"(tmpz)
209  : "memory"
210  );
211  }
212 
213  step = 1 << (MAX_LOG2_NFFT - 4);
214  n4 = 4;
215 
216  for (nbits=4; nbits<=s->nbits; nbits++) {
217  /*
218  * num_transforms = (num_transforms >> 1) | 1;
219  */
220  __asm__ volatile (
221  "sra %[num_t], %[num_t], 1 \n\t"
222  "ori %[num_t], %[num_t], 1 \n\t"
223 
224  : [num_t] "+r" (num_transforms)
225  );
226  n2 = 2 * n4;
227  n34 = 3 * n4;
228 
229  for (n=0; n<num_transforms; n++) {
230  offset = fft_offsets_lut[n] << nbits;
231  tmpz = z + offset;
232 
233  tmpz_n2 = tmpz + n2;
234  tmpz_n4 = tmpz + n4;
235  tmpz_n34 = tmpz + n34;
236 
237  __asm__ volatile (
238  "lwc1 %[pom1], 0(%[tmpz_n2]) \n\t"
239  "lwc1 %[pom], 0(%[tmpz_n34]) \n\t"
240  "lwc1 %[pom2], 4(%[tmpz_n2]) \n\t"
241  "lwc1 %[pom3], 4(%[tmpz_n34]) \n\t"
242  "lwc1 %[temp1],0(%[tmpz]) \n\t"
243  "lwc1 %[temp3],4(%[tmpz]) \n\t"
244  "add.s %[tmp5], %[pom1], %[pom] \n\t" // tmp5 = tmpz[ n2].re + tmpz[n34].re;
245  "sub.s %[tmp1], %[pom1], %[pom] \n\t" // tmp1 = tmpz[ n2].re - tmpz[n34].re;
246  "add.s %[tmp6], %[pom2], %[pom3] \n\t" // tmp6 = tmpz[ n2].im + tmpz[n34].im;
247  "sub.s %[tmp2], %[pom2], %[pom3] \n\t" // tmp2 = tmpz[ n2].im - tmpz[n34].im;
248  "sub.s %[temp], %[temp1], %[tmp5] \n\t"
249  "add.s %[temp1],%[temp1], %[tmp5] \n\t"
250  "sub.s %[temp4],%[temp3], %[tmp6] \n\t"
251  "add.s %[temp3],%[temp3], %[tmp6] \n\t"
252  "swc1 %[temp], 0(%[tmpz_n2]) \n\t" // tmpz[ n2].re = tmpz[ 0].re - tmp5;
253  "swc1 %[temp1],0(%[tmpz]) \n\t" // tmpz[ 0].re = tmpz[ 0].re + tmp5;
254  "lwc1 %[pom1], 0(%[tmpz_n4]) \n\t"
255  "swc1 %[temp4],4(%[tmpz_n2]) \n\t" // tmpz[ n2].im = tmpz[ 0].im - tmp6;
256  "lwc1 %[temp], 4(%[tmpz_n4]) \n\t"
257  "swc1 %[temp3],4(%[tmpz]) \n\t" // tmpz[ 0].im = tmpz[ 0].im + tmp6;
258  "sub.s %[pom], %[pom1], %[tmp2] \n\t"
259  "add.s %[pom1], %[pom1], %[tmp2] \n\t"
260  "add.s %[temp1],%[temp], %[tmp1] \n\t"
261  "sub.s %[temp], %[temp], %[tmp1] \n\t"
262  "swc1 %[pom], 0(%[tmpz_n34]) \n\t" // tmpz[n34].re = tmpz[n4].re - tmp2;
263  "swc1 %[pom1], 0(%[tmpz_n4]) \n\t" // tmpz[ n4].re = tmpz[n4].re + tmp2;
264  "swc1 %[temp1],4(%[tmpz_n34]) \n\t" // tmpz[n34].im = tmpz[n4].im + tmp1;
265  "swc1 %[temp], 4(%[tmpz_n4]) \n\t" // tmpz[ n4].im = tmpz[n4].im - tmp1;
266  : [tmp5]"=&f"(tmp5),
267  [tmp1]"=&f"(tmp1), [pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2),
268  [tmp2]"=&f"(tmp2), [tmp6]"=&f"(tmp6), [pom3]"=&f"(pom3),
269  [temp]"=&f"(temp), [temp1]"=&f"(temp1), [temp3]"=&f"(temp3), [temp4]"=&f"(temp4)
270  : [tmpz]"r"(tmpz), [tmpz_n2]"r"(tmpz_n2), [tmpz_n34]"r"(tmpz_n34), [tmpz_n4]"r"(tmpz_n4)
271  : "memory"
272  );
273 
274  w_re_ptr = (float*)(ff_cos_65536 + step);
275  w_im_ptr = (float*)(ff_cos_65536 + MAX_FFT_SIZE/4 - step);
276 
277  for (i=1; i<n4; i++) {
278  w_re = w_re_ptr[0];
279  w_im = w_im_ptr[0];
280  tmpz_n2_i = tmpz_n2 + i;
281  tmpz_n4_i = tmpz_n4 + i;
282  tmpz_n34_i= tmpz_n34 + i;
283  tmpz_i = tmpz + i;
284 
285  __asm__ volatile (
286  "lwc1 %[temp], 0(%[tmpz_n2_i]) \n\t"
287  "lwc1 %[temp1], 4(%[tmpz_n2_i]) \n\t"
288  "lwc1 %[pom], 0(%[tmpz_n34_i]) \n\t"
289  "lwc1 %[pom1], 4(%[tmpz_n34_i]) \n\t"
290  "mul.s %[temp3], %[w_im], %[temp] \n\t"
291  "mul.s %[temp4], %[w_im], %[temp1] \n\t"
292  "mul.s %[pom2], %[w_im], %[pom1] \n\t"
293  "mul.s %[pom3], %[w_im], %[pom] \n\t"
294  "msub.s %[tmp2], %[temp3], %[w_re], %[temp1] \n\t" // tmp2 = w_re * tmpz[ n2+i].im - w_im * tmpz[ n2+i].re;
295  "madd.s %[tmp1], %[temp4], %[w_re], %[temp] \n\t" // tmp1 = w_re * tmpz[ n2+i].re + w_im * tmpz[ n2+i].im;
296  "msub.s %[tmp3], %[pom2], %[w_re], %[pom] \n\t" // tmp3 = w_re * tmpz[n34+i].re - w_im * tmpz[n34+i].im;
297  "madd.s %[tmp4], %[pom3], %[w_re], %[pom1] \n\t" // tmp4 = w_re * tmpz[n34+i].im + w_im * tmpz[n34+i].re;
298  "lwc1 %[temp], 0(%[tmpz_i]) \n\t"
299  "lwc1 %[pom], 4(%[tmpz_i]) \n\t"
300  "add.s %[tmp5], %[tmp1], %[tmp3] \n\t" // tmp5 = tmp1 + tmp3;
301  "sub.s %[tmp1], %[tmp1], %[tmp3] \n\t" // tmp1 = tmp1 - tmp3;
302  "add.s %[tmp6], %[tmp2], %[tmp4] \n\t" // tmp6 = tmp2 + tmp4;
303  "sub.s %[tmp2], %[tmp2], %[tmp4] \n\t" // tmp2 = tmp2 - tmp4;
304  "sub.s %[temp1], %[temp], %[tmp5] \n\t"
305  "add.s %[temp], %[temp], %[tmp5] \n\t"
306  "sub.s %[pom1], %[pom], %[tmp6] \n\t"
307  "add.s %[pom], %[pom], %[tmp6] \n\t"
308  "lwc1 %[temp3], 0(%[tmpz_n4_i]) \n\t"
309  "lwc1 %[pom2], 4(%[tmpz_n4_i]) \n\t"
310  "swc1 %[temp1], 0(%[tmpz_n2_i]) \n\t" // tmpz[ n2+i].re = tmpz[ i].re - tmp5;
311  "swc1 %[temp], 0(%[tmpz_i]) \n\t" // tmpz[ i].re = tmpz[ i].re + tmp5;
312  "swc1 %[pom1], 4(%[tmpz_n2_i]) \n\t" // tmpz[ n2+i].im = tmpz[ i].im - tmp6;
313  "swc1 %[pom] , 4(%[tmpz_i]) \n\t" // tmpz[ i].im = tmpz[ i].im + tmp6;
314  "sub.s %[temp4], %[temp3], %[tmp2] \n\t"
315  "add.s %[pom3], %[pom2], %[tmp1] \n\t"
316  "add.s %[temp3], %[temp3], %[tmp2] \n\t"
317  "sub.s %[pom2], %[pom2], %[tmp1] \n\t"
318  "swc1 %[temp4], 0(%[tmpz_n34_i]) \n\t" // tmpz[n34+i].re = tmpz[n4+i].re - tmp2;
319  "swc1 %[pom3], 4(%[tmpz_n34_i]) \n\t" // tmpz[n34+i].im = tmpz[n4+i].im + tmp1;
320  "swc1 %[temp3], 0(%[tmpz_n4_i]) \n\t" // tmpz[ n4+i].re = tmpz[n4+i].re + tmp2;
321  "swc1 %[pom2], 4(%[tmpz_n4_i]) \n\t" // tmpz[ n4+i].im = tmpz[n4+i].im - tmp1;
322  : [tmp1]"=&f"(tmp1), [tmp2]"=&f" (tmp2), [temp]"=&f"(temp), [tmp3]"=&f"(tmp3),
323  [tmp4]"=&f"(tmp4), [tmp5]"=&f"(tmp5), [tmp6]"=&f"(tmp6),
324  [temp1]"=&f"(temp1), [temp3]"=&f"(temp3), [temp4]"=&f"(temp4),
325  [pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2), [pom3]"=&f"(pom3)
326  : [w_re]"f"(w_re), [w_im]"f"(w_im),
327  [tmpz_i]"r"(tmpz_i),[tmpz_n2_i]"r"(tmpz_n2_i),
328  [tmpz_n34_i]"r"(tmpz_n34_i), [tmpz_n4_i]"r"(tmpz_n4_i)
329  : "memory"
330  );
331  w_re_ptr += step;
332  w_im_ptr -= step;
333  }
334  }
335  step >>= 1;
336  n4 <<= 1;
337  }
338 }
339 
340 /**
341  * MDCT/IMDCT transforms.
342  */
343 
344 static void ff_imdct_half_mips(FFTContext *s, FFTSample *output, const FFTSample *input)
345 {
346  int k, n8, n4, n2, n, j;
347  const uint16_t *revtab = s->revtab;
348  const FFTSample *tcos = s->tcos;
349  const FFTSample *tsin = s->tsin;
350  const FFTSample *in1, *in2, *in3, *in4;
351  FFTComplex *z = (FFTComplex *)output;
352 
353  int j1;
354  const float *tcos1, *tsin1, *tcos2, *tsin2;
355  float temp1, temp2, temp3, temp4, temp5, temp6, temp7, temp8,
356  temp9, temp10, temp11, temp12, temp13, temp14, temp15, temp16;
357  FFTComplex *z1, *z2;
358 
359  n = 1 << s->mdct_bits;
360  n2 = n >> 1;
361  n4 = n >> 2;
362  n8 = n >> 3;
363 
364  /* pre rotation */
365  in1 = input;
366  in2 = input + n2 - 1;
367  in3 = input + 2;
368  in4 = input + n2 - 3;
369 
370  tcos1 = tcos;
371  tsin1 = tsin;
372 
373  /* n4 = 64 or 128 */
374  for(k = 0; k < n4; k += 2) {
375  j = revtab[k ];
376  j1 = revtab[k + 1];
377 
378  __asm__ volatile (
379  "lwc1 %[temp1], 0(%[in2]) \t\n"
380  "lwc1 %[temp2], 0(%[tcos1]) \t\n"
381  "lwc1 %[temp3], 0(%[tsin1]) \t\n"
382  "lwc1 %[temp4], 0(%[in1]) \t\n"
383  "lwc1 %[temp5], 0(%[in4]) \t\n"
384  "mul.s %[temp9], %[temp1], %[temp2] \t\n"
385  "mul.s %[temp10], %[temp1], %[temp3] \t\n"
386  "lwc1 %[temp6], 4(%[tcos1]) \t\n"
387  "lwc1 %[temp7], 4(%[tsin1]) \t\n"
388  "nmsub.s %[temp9], %[temp9], %[temp4], %[temp3] \t\n"
389  "madd.s %[temp10], %[temp10], %[temp4], %[temp2] \t\n"
390  "mul.s %[temp11], %[temp5], %[temp6] \t\n"
391  "mul.s %[temp12], %[temp5], %[temp7] \t\n"
392  "lwc1 %[temp8], 0(%[in3]) \t\n"
393  "addiu %[tcos1], %[tcos1], 8 \t\n"
394  "addiu %[tsin1], %[tsin1], 8 \t\n"
395  "addiu %[in1], %[in1], 16 \t\n"
396  "nmsub.s %[temp11], %[temp11], %[temp8], %[temp7] \t\n"
397  "madd.s %[temp12], %[temp12], %[temp8], %[temp6] \t\n"
398  "addiu %[in2], %[in2], -16 \t\n"
399  "addiu %[in3], %[in3], 16 \t\n"
400  "addiu %[in4], %[in4], -16 \t\n"
401 
402  : [temp1]"=&f"(temp1), [temp2]"=&f"(temp2),
403  [temp3]"=&f"(temp3), [temp4]"=&f"(temp4),
404  [temp5]"=&f"(temp5), [temp6]"=&f"(temp6),
405  [temp7]"=&f"(temp7), [temp8]"=&f"(temp8),
406  [temp9]"=&f"(temp9), [temp10]"=&f"(temp10),
407  [temp11]"=&f"(temp11), [temp12]"=&f"(temp12),
408  [tsin1]"+r"(tsin1), [tcos1]"+r"(tcos1),
409  [in1]"+r"(in1), [in2]"+r"(in2),
410  [in3]"+r"(in3), [in4]"+r"(in4)
411  :
412  : "memory"
413  );
414 
415  z[j ].re = temp9;
416  z[j ].im = temp10;
417  z[j1].re = temp11;
418  z[j1].im = temp12;
419  }
420 
421  s->fft_calc(s, z);
422 
423  /* post rotation + reordering */
424  /* n8 = 32 or 64 */
425  for(k = 0; k < n8; k += 2) {
426  tcos1 = &tcos[n8 - k - 2];
427  tsin1 = &tsin[n8 - k - 2];
428  tcos2 = &tcos[n8 + k];
429  tsin2 = &tsin[n8 + k];
430  z1 = &z[n8 - k - 2];
431  z2 = &z[n8 + k ];
432 
433  __asm__ volatile (
434  "lwc1 %[temp1], 12(%[z1]) \t\n"
435  "lwc1 %[temp2], 4(%[tsin1]) \t\n"
436  "lwc1 %[temp3], 4(%[tcos1]) \t\n"
437  "lwc1 %[temp4], 8(%[z1]) \t\n"
438  "lwc1 %[temp5], 4(%[z1]) \t\n"
439  "mul.s %[temp9], %[temp1], %[temp2] \t\n"
440  "mul.s %[temp10], %[temp1], %[temp3] \t\n"
441  "lwc1 %[temp6], 0(%[tsin1]) \t\n"
442  "lwc1 %[temp7], 0(%[tcos1]) \t\n"
443  "nmsub.s %[temp9], %[temp9], %[temp4], %[temp3] \t\n"
444  "madd.s %[temp10], %[temp10], %[temp4], %[temp2] \t\n"
445  "mul.s %[temp11], %[temp5], %[temp6] \t\n"
446  "mul.s %[temp12], %[temp5], %[temp7] \t\n"
447  "lwc1 %[temp8], 0(%[z1]) \t\n"
448  "lwc1 %[temp1], 4(%[z2]) \t\n"
449  "lwc1 %[temp2], 0(%[tsin2]) \t\n"
450  "lwc1 %[temp3], 0(%[tcos2]) \t\n"
451  "nmsub.s %[temp11], %[temp11], %[temp8], %[temp7] \t\n"
452  "madd.s %[temp12], %[temp12], %[temp8], %[temp6] \t\n"
453  "mul.s %[temp13], %[temp1], %[temp2] \t\n"
454  "mul.s %[temp14], %[temp1], %[temp3] \t\n"
455  "lwc1 %[temp4], 0(%[z2]) \t\n"
456  "lwc1 %[temp5], 12(%[z2]) \t\n"
457  "lwc1 %[temp6], 4(%[tsin2]) \t\n"
458  "lwc1 %[temp7], 4(%[tcos2]) \t\n"
459  "nmsub.s %[temp13], %[temp13], %[temp4], %[temp3] \t\n"
460  "madd.s %[temp14], %[temp14], %[temp4], %[temp2] \t\n"
461  "mul.s %[temp15], %[temp5], %[temp6] \t\n"
462  "mul.s %[temp16], %[temp5], %[temp7] \t\n"
463  "lwc1 %[temp8], 8(%[z2]) \t\n"
464  "nmsub.s %[temp15], %[temp15], %[temp8], %[temp7] \t\n"
465  "madd.s %[temp16], %[temp16], %[temp8], %[temp6] \t\n"
466  : [temp1]"=&f"(temp1), [temp2]"=&f"(temp2),
467  [temp3]"=&f"(temp3), [temp4]"=&f"(temp4),
468  [temp5]"=&f"(temp5), [temp6]"=&f"(temp6),
469  [temp7]"=&f"(temp7), [temp8]"=&f"(temp8),
470  [temp9]"=&f"(temp9), [temp10]"=&f"(temp10),
471  [temp11]"=&f"(temp11), [temp12]"=&f"(temp12),
472  [temp13]"=&f"(temp13), [temp14]"=&f"(temp14),
473  [temp15]"=&f"(temp15), [temp16]"=&f"(temp16)
474  : [z1]"r"(z1), [z2]"r"(z2),
475  [tsin1]"r"(tsin1), [tcos1]"r"(tcos1),
476  [tsin2]"r"(tsin2), [tcos2]"r"(tcos2)
477  : "memory"
478  );
479 
480  z1[1].re = temp9;
481  z1[1].im = temp14;
482  z2[0].re = temp13;
483  z2[0].im = temp10;
484 
485  z1[0].re = temp11;
486  z1[0].im = temp16;
487  z2[1].re = temp15;
488  z2[1].im = temp12;
489  }
490 }
491 
492 /**
493  * Compute inverse MDCT of size N = 2^nbits
494  * @param output N samples
495  * @param input N/2 samples
496  */
497 static void ff_imdct_calc_mips(FFTContext *s, FFTSample *output, const FFTSample *input)
498 {
499  int k;
500  int n = 1 << s->mdct_bits;
501  int n2 = n >> 1;
502  int n4 = n >> 2;
503 
504  ff_imdct_half_mips(s, output+n4, input);
505 
506  for(k = 0; k < n4; k+=4) {
507  output[k] = -output[n2-k-1];
508  output[k+1] = -output[n2-k-2];
509  output[k+2] = -output[n2-k-3];
510  output[k+3] = -output[n2-k-4];
511 
512  output[n-k-1] = output[n2+k];
513  output[n-k-2] = output[n2+k+1];
514  output[n-k-3] = output[n2+k+2];
515  output[n-k-4] = output[n2+k+3];
516  }
517 }
518 #endif /* HAVE_INLINE_ASM */
519 
520 av_cold void ff_fft_init_mips(FFTContext *s)
521 {
522  int n=0;
523 
524  ff_fft_lut_init(fft_offsets_lut, 0, 1 << 16, &n);
525  ff_init_ff_cos_tabs(16);
526 
527 #if HAVE_INLINE_ASM
528  s->fft_calc = ff_fft_calc_mips;
529 #if CONFIG_MDCT
530  s->imdct_calc = ff_imdct_calc_mips;
531  s->imdct_half = ff_imdct_half_mips;
532 #endif
533 #endif
534 }
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