3 * MIPS Technologies, Inc., California.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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9 * notice, this list of conditions and the following disclaimer.
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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.
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
29 * Author: Stanislav Ocovaj (socovaj@mips.com)
30 * Author: Zoran Lukic (zoranl@mips.com)
32 * Optimized MDCT/IMDCT and FFT transforms
34 * This file is part of FFmpeg.
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.
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.
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
51 #include "libavcodec/fft.h"
52 #include "libavcodec/fft_table.h"
53 #include "libavutil/mips/asmdefs.h"
60 static void ff_fft_calc_mips(FFTContext *s, FFTComplex *z)
62 int nbits, i, n, num_transforms, offset, step;
64 FFTSample tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8;
67 float *w_re_ptr, *w_im_ptr;
68 const int fft_size = (1 << s->nbits);
69 float pom, pom1, pom2, pom3;
70 float temp, temp1, temp3, temp4;
71 FFTComplex * tmpz_n2, * tmpz_n34, * tmpz_n4;
72 FFTComplex * tmpz_n2_i, * tmpz_n34_i, * tmpz_n4_i, * tmpz_i;
74 num_transforms = (0x2aab >> (16 - s->nbits)) | 1;
76 for (n=0; n<num_transforms; n++) {
77 offset = ff_fft_offsets_lut[n] << 2;
80 tmp1 = tmpz[0].re + tmpz[1].re;
81 tmp5 = tmpz[2].re + tmpz[3].re;
82 tmp2 = tmpz[0].im + tmpz[1].im;
83 tmp6 = tmpz[2].im + tmpz[3].im;
84 tmp3 = tmpz[0].re - tmpz[1].re;
85 tmp8 = tmpz[2].im - tmpz[3].im;
86 tmp4 = tmpz[0].im - tmpz[1].im;
87 tmp7 = tmpz[2].re - tmpz[3].re;
89 tmpz[0].re = tmp1 + tmp5;
90 tmpz[2].re = tmp1 - tmp5;
91 tmpz[0].im = tmp2 + tmp6;
92 tmpz[2].im = tmp2 - tmp6;
93 tmpz[1].re = tmp3 + tmp8;
94 tmpz[3].re = tmp3 - tmp8;
95 tmpz[1].im = tmp4 - tmp7;
96 tmpz[3].im = tmp4 + tmp7;
103 num_transforms = (num_transforms >> 1) | 1;
105 for (n=0; n<num_transforms; n++) {
106 offset = ff_fft_offsets_lut[n] << 3;
110 "lwc1 %[tmp1], 32(%[tmpz]) \n\t"
111 "lwc1 %[pom], 40(%[tmpz]) \n\t"
112 "lwc1 %[tmp3], 48(%[tmpz]) \n\t"
113 "lwc1 %[pom1], 56(%[tmpz]) \n\t"
114 "lwc1 %[tmp2], 36(%[tmpz]) \n\t"
115 "lwc1 %[pom2], 44(%[tmpz]) \n\t"
116 "lwc1 %[pom3], 60(%[tmpz]) \n\t"
117 "lwc1 %[tmp4], 52(%[tmpz]) \n\t"
118 "add.s %[tmp1], %[tmp1], %[pom] \n\t" // tmp1 = tmpz[4].re + tmpz[5].re;
119 "add.s %[tmp3], %[tmp3], %[pom1] \n\t" // tmp3 = tmpz[6].re + tmpz[7].re;
120 "add.s %[tmp2], %[tmp2], %[pom2] \n\t" // tmp2 = tmpz[4].im + tmpz[5].im;
121 "lwc1 %[pom], 40(%[tmpz]) \n\t"
122 "add.s %[tmp4], %[tmp4], %[pom3] \n\t" // tmp4 = tmpz[6].im + tmpz[7].im;
123 "add.s %[tmp5], %[tmp1], %[tmp3] \n\t" // tmp5 = tmp1 + tmp3;
124 "sub.s %[tmp7], %[tmp1], %[tmp3] \n\t" // tmp7 = tmp1 - tmp3;
125 "lwc1 %[tmp1], 32(%[tmpz]) \n\t"
126 "lwc1 %[pom1], 44(%[tmpz]) \n\t"
127 "add.s %[tmp6], %[tmp2], %[tmp4] \n\t" // tmp6 = tmp2 + tmp4;
128 "sub.s %[tmp8], %[tmp2], %[tmp4] \n\t" // tmp8 = tmp2 - tmp4;
129 "lwc1 %[tmp2], 36(%[tmpz]) \n\t"
130 "lwc1 %[pom2], 56(%[tmpz]) \n\t"
131 "lwc1 %[pom3], 60(%[tmpz]) \n\t"
132 "lwc1 %[tmp3], 48(%[tmpz]) \n\t"
133 "lwc1 %[tmp4], 52(%[tmpz]) \n\t"
134 "sub.s %[tmp1], %[tmp1], %[pom] \n\t" // tmp1 = tmpz[4].re - tmpz[5].re;
135 "lwc1 %[pom], 0(%[tmpz]) \n\t"
136 "sub.s %[tmp2], %[tmp2], %[pom1] \n\t" // tmp2 = tmpz[4].im - tmpz[5].im;
137 "sub.s %[tmp3], %[tmp3], %[pom2] \n\t" // tmp3 = tmpz[6].re - tmpz[7].re;
138 "lwc1 %[pom2], 4(%[tmpz]) \n\t"
139 "sub.s %[pom1], %[pom], %[tmp5] \n\t"
140 "sub.s %[tmp4], %[tmp4], %[pom3] \n\t" // tmp4 = tmpz[6].im - tmpz[7].im;
141 "add.s %[pom3], %[pom], %[tmp5] \n\t"
142 "sub.s %[pom], %[pom2], %[tmp6] \n\t"
143 "add.s %[pom2], %[pom2], %[tmp6] \n\t"
144 "swc1 %[pom1], 32(%[tmpz]) \n\t" // tmpz[4].re = tmpz[0].re - tmp5;
145 "swc1 %[pom3], 0(%[tmpz]) \n\t" // tmpz[0].re = tmpz[0].re + tmp5;
146 "swc1 %[pom], 36(%[tmpz]) \n\t" // tmpz[4].im = tmpz[0].im - tmp6;
147 "swc1 %[pom2], 4(%[tmpz]) \n\t" // tmpz[0].im = tmpz[0].im + tmp6;
148 "lwc1 %[pom1], 16(%[tmpz]) \n\t"
149 "lwc1 %[pom3], 20(%[tmpz]) \n\t"
150 "li.s %[pom], 0.7071067812 \n\t" // float pom = 0.7071067812f;
151 "add.s %[temp1],%[tmp1], %[tmp2] \n\t"
152 "sub.s %[temp], %[pom1], %[tmp8] \n\t"
153 "add.s %[pom2], %[pom3], %[tmp7] \n\t"
154 "sub.s %[temp3],%[tmp3], %[tmp4] \n\t"
155 "sub.s %[temp4],%[tmp2], %[tmp1] \n\t"
156 "swc1 %[temp], 48(%[tmpz]) \n\t" // tmpz[6].re = tmpz[2].re - tmp8;
157 "swc1 %[pom2], 52(%[tmpz]) \n\t" // tmpz[6].im = tmpz[2].im + tmp7;
158 "add.s %[pom1], %[pom1], %[tmp8] \n\t"
159 "sub.s %[pom3], %[pom3], %[tmp7] \n\t"
160 "add.s %[tmp3], %[tmp3], %[tmp4] \n\t"
161 "mul.s %[tmp5], %[pom], %[temp1] \n\t" // tmp5 = pom * (tmp1 + tmp2);
162 "mul.s %[tmp7], %[pom], %[temp3] \n\t" // tmp7 = pom * (tmp3 - tmp4);
163 "mul.s %[tmp6], %[pom], %[temp4] \n\t" // tmp6 = pom * (tmp2 - tmp1);
164 "mul.s %[tmp8], %[pom], %[tmp3] \n\t" // tmp8 = pom * (tmp3 + tmp4);
165 "swc1 %[pom1], 16(%[tmpz]) \n\t" // tmpz[2].re = tmpz[2].re + tmp8;
166 "swc1 %[pom3], 20(%[tmpz]) \n\t" // tmpz[2].im = tmpz[2].im - tmp7;
167 "add.s %[tmp1], %[tmp5], %[tmp7] \n\t" // tmp1 = tmp5 + tmp7;
168 "sub.s %[tmp3], %[tmp5], %[tmp7] \n\t" // tmp3 = tmp5 - tmp7;
169 "add.s %[tmp2], %[tmp6], %[tmp8] \n\t" // tmp2 = tmp6 + tmp8;
170 "sub.s %[tmp4], %[tmp6], %[tmp8] \n\t" // tmp4 = tmp6 - tmp8;
171 "lwc1 %[temp], 8(%[tmpz]) \n\t"
172 "lwc1 %[temp1],12(%[tmpz]) \n\t"
173 "lwc1 %[pom], 24(%[tmpz]) \n\t"
174 "lwc1 %[pom2], 28(%[tmpz]) \n\t"
175 "sub.s %[temp4],%[temp], %[tmp1] \n\t"
176 "sub.s %[temp3],%[temp1], %[tmp2] \n\t"
177 "add.s %[temp], %[temp], %[tmp1] \n\t"
178 "add.s %[temp1],%[temp1], %[tmp2] \n\t"
179 "sub.s %[pom1], %[pom], %[tmp4] \n\t"
180 "add.s %[pom3], %[pom2], %[tmp3] \n\t"
181 "add.s %[pom], %[pom], %[tmp4] \n\t"
182 "sub.s %[pom2], %[pom2], %[tmp3] \n\t"
183 "swc1 %[temp4],40(%[tmpz]) \n\t" // tmpz[5].re = tmpz[1].re - tmp1;
184 "swc1 %[temp3],44(%[tmpz]) \n\t" // tmpz[5].im = tmpz[1].im - tmp2;
185 "swc1 %[temp], 8(%[tmpz]) \n\t" // tmpz[1].re = tmpz[1].re + tmp1;
186 "swc1 %[temp1],12(%[tmpz]) \n\t" // tmpz[1].im = tmpz[1].im + tmp2;
187 "swc1 %[pom1], 56(%[tmpz]) \n\t" // tmpz[7].re = tmpz[3].re - tmp4;
188 "swc1 %[pom3], 60(%[tmpz]) \n\t" // tmpz[7].im = tmpz[3].im + tmp3;
189 "swc1 %[pom], 24(%[tmpz]) \n\t" // tmpz[3].re = tmpz[3].re + tmp4;
190 "swc1 %[pom2], 28(%[tmpz]) \n\t" // tmpz[3].im = tmpz[3].im - tmp3;
191 : [tmp1]"=&f"(tmp1), [pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2),
192 [tmp3]"=&f"(tmp3), [tmp2]"=&f"(tmp2), [tmp4]"=&f"(tmp4), [tmp5]"=&f"(tmp5), [tmp7]"=&f"(tmp7),
193 [tmp6]"=&f"(tmp6), [tmp8]"=&f"(tmp8), [pom3]"=&f"(pom3),[temp]"=&f"(temp), [temp1]"=&f"(temp1),
194 [temp3]"=&f"(temp3), [temp4]"=&f"(temp4)
200 step = 1 << (MAX_LOG2_NFFT - 4);
203 for (nbits=4; nbits<=s->nbits; nbits++) {
204 num_transforms = (num_transforms >> 1) | 1;
208 for (n=0; n<num_transforms; n++) {
209 offset = ff_fft_offsets_lut[n] << nbits;
214 tmpz_n34 = tmpz + n34;
217 "lwc1 %[pom1], 0(%[tmpz_n2]) \n\t"
218 "lwc1 %[pom], 0(%[tmpz_n34]) \n\t"
219 "lwc1 %[pom2], 4(%[tmpz_n2]) \n\t"
220 "lwc1 %[pom3], 4(%[tmpz_n34]) \n\t"
221 "lwc1 %[temp1],0(%[tmpz]) \n\t"
222 "lwc1 %[temp3],4(%[tmpz]) \n\t"
223 "add.s %[tmp5], %[pom1], %[pom] \n\t" // tmp5 = tmpz[ n2].re + tmpz[n34].re;
224 "sub.s %[tmp1], %[pom1], %[pom] \n\t" // tmp1 = tmpz[ n2].re - tmpz[n34].re;
225 "add.s %[tmp6], %[pom2], %[pom3] \n\t" // tmp6 = tmpz[ n2].im + tmpz[n34].im;
226 "sub.s %[tmp2], %[pom2], %[pom3] \n\t" // tmp2 = tmpz[ n2].im - tmpz[n34].im;
227 "sub.s %[temp], %[temp1], %[tmp5] \n\t"
228 "add.s %[temp1],%[temp1], %[tmp5] \n\t"
229 "sub.s %[temp4],%[temp3], %[tmp6] \n\t"
230 "add.s %[temp3],%[temp3], %[tmp6] \n\t"
231 "swc1 %[temp], 0(%[tmpz_n2]) \n\t" // tmpz[ n2].re = tmpz[ 0].re - tmp5;
232 "swc1 %[temp1],0(%[tmpz]) \n\t" // tmpz[ 0].re = tmpz[ 0].re + tmp5;
233 "lwc1 %[pom1], 0(%[tmpz_n4]) \n\t"
234 "swc1 %[temp4],4(%[tmpz_n2]) \n\t" // tmpz[ n2].im = tmpz[ 0].im - tmp6;
235 "lwc1 %[temp], 4(%[tmpz_n4]) \n\t"
236 "swc1 %[temp3],4(%[tmpz]) \n\t" // tmpz[ 0].im = tmpz[ 0].im + tmp6;
237 "sub.s %[pom], %[pom1], %[tmp2] \n\t"
238 "add.s %[pom1], %[pom1], %[tmp2] \n\t"
239 "add.s %[temp1],%[temp], %[tmp1] \n\t"
240 "sub.s %[temp], %[temp], %[tmp1] \n\t"
241 "swc1 %[pom], 0(%[tmpz_n34]) \n\t" // tmpz[n34].re = tmpz[n4].re - tmp2;
242 "swc1 %[pom1], 0(%[tmpz_n4]) \n\t" // tmpz[ n4].re = tmpz[n4].re + tmp2;
243 "swc1 %[temp1],4(%[tmpz_n34]) \n\t" // tmpz[n34].im = tmpz[n4].im + tmp1;
244 "swc1 %[temp], 4(%[tmpz_n4]) \n\t" // tmpz[ n4].im = tmpz[n4].im - tmp1;
246 [tmp1]"=&f"(tmp1), [pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2),
247 [tmp2]"=&f"(tmp2), [tmp6]"=&f"(tmp6), [pom3]"=&f"(pom3),
248 [temp]"=&f"(temp), [temp1]"=&f"(temp1), [temp3]"=&f"(temp3), [temp4]"=&f"(temp4)
249 : [tmpz]"r"(tmpz), [tmpz_n2]"r"(tmpz_n2), [tmpz_n34]"r"(tmpz_n34), [tmpz_n4]"r"(tmpz_n4)
253 w_re_ptr = (float*)(ff_cos_65536 + step);
254 w_im_ptr = (float*)(ff_cos_65536 + MAX_FFT_SIZE/4 - step);
256 for (i=1; i<n4; i++) {
259 tmpz_n2_i = tmpz_n2 + i;
260 tmpz_n4_i = tmpz_n4 + i;
261 tmpz_n34_i= tmpz_n34 + i;
265 "lwc1 %[temp], 0(%[tmpz_n2_i]) \n\t"
266 "lwc1 %[temp1], 4(%[tmpz_n2_i]) \n\t"
267 "lwc1 %[pom], 0(%[tmpz_n34_i]) \n\t"
268 "lwc1 %[pom1], 4(%[tmpz_n34_i]) \n\t"
269 "mul.s %[temp3], %[w_im], %[temp] \n\t"
270 "mul.s %[temp4], %[w_im], %[temp1] \n\t"
271 "mul.s %[pom2], %[w_im], %[pom1] \n\t"
272 "mul.s %[pom3], %[w_im], %[pom] \n\t"
273 "msub.s %[tmp2], %[temp3], %[w_re], %[temp1] \n\t" // tmp2 = w_re * tmpz[ n2+i].im - w_im * tmpz[ n2+i].re;
274 "madd.s %[tmp1], %[temp4], %[w_re], %[temp] \n\t" // tmp1 = w_re * tmpz[ n2+i].re + w_im * tmpz[ n2+i].im;
275 "msub.s %[tmp3], %[pom2], %[w_re], %[pom] \n\t" // tmp3 = w_re * tmpz[n34+i].re - w_im * tmpz[n34+i].im;
276 "madd.s %[tmp4], %[pom3], %[w_re], %[pom1] \n\t" // tmp4 = w_re * tmpz[n34+i].im + w_im * tmpz[n34+i].re;
277 "lwc1 %[temp], 0(%[tmpz_i]) \n\t"
278 "lwc1 %[pom], 4(%[tmpz_i]) \n\t"
279 "add.s %[tmp5], %[tmp1], %[tmp3] \n\t" // tmp5 = tmp1 + tmp3;
280 "sub.s %[tmp1], %[tmp1], %[tmp3] \n\t" // tmp1 = tmp1 - tmp3;
281 "add.s %[tmp6], %[tmp2], %[tmp4] \n\t" // tmp6 = tmp2 + tmp4;
282 "sub.s %[tmp2], %[tmp2], %[tmp4] \n\t" // tmp2 = tmp2 - tmp4;
283 "sub.s %[temp1], %[temp], %[tmp5] \n\t"
284 "add.s %[temp], %[temp], %[tmp5] \n\t"
285 "sub.s %[pom1], %[pom], %[tmp6] \n\t"
286 "add.s %[pom], %[pom], %[tmp6] \n\t"
287 "lwc1 %[temp3], 0(%[tmpz_n4_i]) \n\t"
288 "lwc1 %[pom2], 4(%[tmpz_n4_i]) \n\t"
289 "swc1 %[temp1], 0(%[tmpz_n2_i]) \n\t" // tmpz[ n2+i].re = tmpz[ i].re - tmp5;
290 "swc1 %[temp], 0(%[tmpz_i]) \n\t" // tmpz[ i].re = tmpz[ i].re + tmp5;
291 "swc1 %[pom1], 4(%[tmpz_n2_i]) \n\t" // tmpz[ n2+i].im = tmpz[ i].im - tmp6;
292 "swc1 %[pom] , 4(%[tmpz_i]) \n\t" // tmpz[ i].im = tmpz[ i].im + tmp6;
293 "sub.s %[temp4], %[temp3], %[tmp2] \n\t"
294 "add.s %[pom3], %[pom2], %[tmp1] \n\t"
295 "add.s %[temp3], %[temp3], %[tmp2] \n\t"
296 "sub.s %[pom2], %[pom2], %[tmp1] \n\t"
297 "swc1 %[temp4], 0(%[tmpz_n34_i]) \n\t" // tmpz[n34+i].re = tmpz[n4+i].re - tmp2;
298 "swc1 %[pom3], 4(%[tmpz_n34_i]) \n\t" // tmpz[n34+i].im = tmpz[n4+i].im + tmp1;
299 "swc1 %[temp3], 0(%[tmpz_n4_i]) \n\t" // tmpz[ n4+i].re = tmpz[n4+i].re + tmp2;
300 "swc1 %[pom2], 4(%[tmpz_n4_i]) \n\t" // tmpz[ n4+i].im = tmpz[n4+i].im - tmp1;
301 : [tmp1]"=&f"(tmp1), [tmp2]"=&f" (tmp2), [temp]"=&f"(temp), [tmp3]"=&f"(tmp3),
302 [tmp4]"=&f"(tmp4), [tmp5]"=&f"(tmp5), [tmp6]"=&f"(tmp6),
303 [temp1]"=&f"(temp1), [temp3]"=&f"(temp3), [temp4]"=&f"(temp4),
304 [pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2), [pom3]"=&f"(pom3)
305 : [w_re]"f"(w_re), [w_im]"f"(w_im),
306 [tmpz_i]"r"(tmpz_i),[tmpz_n2_i]"r"(tmpz_n2_i),
307 [tmpz_n34_i]"r"(tmpz_n34_i), [tmpz_n4_i]"r"(tmpz_n4_i)
320 * MDCT/IMDCT transforms.
323 static void ff_imdct_half_mips(FFTContext *s, FFTSample *output, const FFTSample *input)
325 int k, n8, n4, n2, n, j;
326 const uint16_t *revtab = s->revtab;
327 const FFTSample *tcos = s->tcos;
328 const FFTSample *tsin = s->tsin;
329 const FFTSample *in1, *in2, *in3, *in4;
330 FFTComplex *z = (FFTComplex *)output;
333 const float *tcos1, *tsin1, *tcos2, *tsin2;
334 float temp1, temp2, temp3, temp4, temp5, temp6, temp7, temp8,
335 temp9, temp10, temp11, temp12, temp13, temp14, temp15, temp16;
338 n = 1 << s->mdct_bits;
345 in2 = input + n2 - 1;
347 in4 = input + n2 - 3;
353 for(k = 0; k < n4; k += 2) {
358 "lwc1 %[temp1], 0(%[in2]) \t\n"
359 "lwc1 %[temp2], 0(%[tcos1]) \t\n"
360 "lwc1 %[temp3], 0(%[tsin1]) \t\n"
361 "lwc1 %[temp4], 0(%[in1]) \t\n"
362 "lwc1 %[temp5], 0(%[in4]) \t\n"
363 "mul.s %[temp9], %[temp1], %[temp2] \t\n"
364 "mul.s %[temp10], %[temp1], %[temp3] \t\n"
365 "lwc1 %[temp6], 4(%[tcos1]) \t\n"
366 "lwc1 %[temp7], 4(%[tsin1]) \t\n"
367 "nmsub.s %[temp9], %[temp9], %[temp4], %[temp3] \t\n"
368 "madd.s %[temp10], %[temp10], %[temp4], %[temp2] \t\n"
369 "mul.s %[temp11], %[temp5], %[temp6] \t\n"
370 "mul.s %[temp12], %[temp5], %[temp7] \t\n"
371 "lwc1 %[temp8], 0(%[in3]) \t\n"
372 PTR_ADDIU " %[tcos1], %[tcos1], 8 \t\n"
373 PTR_ADDIU " %[tsin1], %[tsin1], 8 \t\n"
374 PTR_ADDIU " %[in1], %[in1], 16 \t\n"
375 "nmsub.s %[temp11], %[temp11], %[temp8], %[temp7] \t\n"
376 "madd.s %[temp12], %[temp12], %[temp8], %[temp6] \t\n"
377 PTR_ADDIU " %[in2], %[in2], -16 \t\n"
378 PTR_ADDIU " %[in3], %[in3], 16 \t\n"
379 PTR_ADDIU " %[in4], %[in4], -16 \t\n"
381 : [temp1]"=&f"(temp1), [temp2]"=&f"(temp2),
382 [temp3]"=&f"(temp3), [temp4]"=&f"(temp4),
383 [temp5]"=&f"(temp5), [temp6]"=&f"(temp6),
384 [temp7]"=&f"(temp7), [temp8]"=&f"(temp8),
385 [temp9]"=&f"(temp9), [temp10]"=&f"(temp10),
386 [temp11]"=&f"(temp11), [temp12]"=&f"(temp12),
387 [tsin1]"+r"(tsin1), [tcos1]"+r"(tcos1),
388 [in1]"+r"(in1), [in2]"+r"(in2),
389 [in3]"+r"(in3), [in4]"+r"(in4)
402 /* post rotation + reordering */
404 for(k = 0; k < n8; k += 2) {
405 tcos1 = &tcos[n8 - k - 2];
406 tsin1 = &tsin[n8 - k - 2];
407 tcos2 = &tcos[n8 + k];
408 tsin2 = &tsin[n8 + k];
413 "lwc1 %[temp1], 12(%[z1]) \t\n"
414 "lwc1 %[temp2], 4(%[tsin1]) \t\n"
415 "lwc1 %[temp3], 4(%[tcos1]) \t\n"
416 "lwc1 %[temp4], 8(%[z1]) \t\n"
417 "lwc1 %[temp5], 4(%[z1]) \t\n"
418 "mul.s %[temp9], %[temp1], %[temp2] \t\n"
419 "mul.s %[temp10], %[temp1], %[temp3] \t\n"
420 "lwc1 %[temp6], 0(%[tsin1]) \t\n"
421 "lwc1 %[temp7], 0(%[tcos1]) \t\n"
422 "nmsub.s %[temp9], %[temp9], %[temp4], %[temp3] \t\n"
423 "madd.s %[temp10], %[temp10], %[temp4], %[temp2] \t\n"
424 "mul.s %[temp11], %[temp5], %[temp6] \t\n"
425 "mul.s %[temp12], %[temp5], %[temp7] \t\n"
426 "lwc1 %[temp8], 0(%[z1]) \t\n"
427 "lwc1 %[temp1], 4(%[z2]) \t\n"
428 "lwc1 %[temp2], 0(%[tsin2]) \t\n"
429 "lwc1 %[temp3], 0(%[tcos2]) \t\n"
430 "nmsub.s %[temp11], %[temp11], %[temp8], %[temp7] \t\n"
431 "madd.s %[temp12], %[temp12], %[temp8], %[temp6] \t\n"
432 "mul.s %[temp13], %[temp1], %[temp2] \t\n"
433 "mul.s %[temp14], %[temp1], %[temp3] \t\n"
434 "lwc1 %[temp4], 0(%[z2]) \t\n"
435 "lwc1 %[temp5], 12(%[z2]) \t\n"
436 "lwc1 %[temp6], 4(%[tsin2]) \t\n"
437 "lwc1 %[temp7], 4(%[tcos2]) \t\n"
438 "nmsub.s %[temp13], %[temp13], %[temp4], %[temp3] \t\n"
439 "madd.s %[temp14], %[temp14], %[temp4], %[temp2] \t\n"
440 "mul.s %[temp15], %[temp5], %[temp6] \t\n"
441 "mul.s %[temp16], %[temp5], %[temp7] \t\n"
442 "lwc1 %[temp8], 8(%[z2]) \t\n"
443 "nmsub.s %[temp15], %[temp15], %[temp8], %[temp7] \t\n"
444 "madd.s %[temp16], %[temp16], %[temp8], %[temp6] \t\n"
445 : [temp1]"=&f"(temp1), [temp2]"=&f"(temp2),
446 [temp3]"=&f"(temp3), [temp4]"=&f"(temp4),
447 [temp5]"=&f"(temp5), [temp6]"=&f"(temp6),
448 [temp7]"=&f"(temp7), [temp8]"=&f"(temp8),
449 [temp9]"=&f"(temp9), [temp10]"=&f"(temp10),
450 [temp11]"=&f"(temp11), [temp12]"=&f"(temp12),
451 [temp13]"=&f"(temp13), [temp14]"=&f"(temp14),
452 [temp15]"=&f"(temp15), [temp16]"=&f"(temp16)
453 : [z1]"r"(z1), [z2]"r"(z2),
454 [tsin1]"r"(tsin1), [tcos1]"r"(tcos1),
455 [tsin2]"r"(tsin2), [tcos2]"r"(tcos2)
472 * Compute inverse MDCT of size N = 2^nbits
473 * @param output N samples
474 * @param input N/2 samples
476 static void ff_imdct_calc_mips(FFTContext *s, FFTSample *output, const FFTSample *input)
479 int n = 1 << s->mdct_bits;
483 ff_imdct_half_mips(s, output+n4, input);
485 for(k = 0; k < n4; k+=4) {
486 output[k] = -output[n2-k-1];
487 output[k+1] = -output[n2-k-2];
488 output[k+2] = -output[n2-k-3];
489 output[k+3] = -output[n2-k-4];
491 output[n-k-1] = output[n2+k];
492 output[n-k-2] = output[n2+k+1];
493 output[n-k-3] = output[n2+k+2];
494 output[n-k-4] = output[n2+k+3];
497 #endif /* HAVE_INLINE_ASM */
499 av_cold void ff_fft_init_mips(FFTContext *s)
503 ff_fft_lut_init(ff_fft_offsets_lut, 0, 1 << 16, &n);
504 ff_init_ff_cos_tabs(16);
507 s->fft_calc = ff_fft_calc_mips;
509 s->imdct_calc = ff_imdct_calc_mips;
510 s->imdct_half = ff_imdct_half_mips;