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celp_filters_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: Nedeljko Babic (nbabic@mips.com)
30  *
31  * various filters for CELP-based codecs optimized for MIPS
32  *
33  * This file is part of FFmpeg.
34  *
35  * FFmpeg is free software; you can redistribute it and/or
36  * modify it under the terms of the GNU Lesser General Public
37  * License as published by the Free Software Foundation; either
38  * version 2.1 of the License, or (at your option) any later version.
39  *
40  * FFmpeg is distributed in the hope that it will be useful,
41  * but WITHOUT ANY WARRANTY; without even the implied warranty of
42  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
43  * Lesser General Public License for more details.
44  *
45  * You should have received a copy of the GNU Lesser General Public
46  * License along with FFmpeg; if not, write to the Free Software
47  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
48  */
49 
50 /**
51  * @file
52  * Reference: libavcodec/celp_filters.c
53  */
54 #include "config.h"
55 #include "libavutil/attributes.h"
56 #include "libavutil/common.h"
57 #include "libavcodec/celp_filters.h"
58 
59 #if HAVE_INLINE_ASM
60 static void ff_celp_lp_synthesis_filterf_mips(float *out,
61  const float *filter_coeffs,
62  const float* in, int buffer_length,
63  int filter_length)
64 {
65  int i,n;
66 
67  float out0, out1, out2, out3;
68  float old_out0, old_out1, old_out2, old_out3;
69  float a,b,c;
70  const float *p_filter_coeffs;
71  float *p_out;
72 
73  a = filter_coeffs[0];
74  b = filter_coeffs[1];
75  c = filter_coeffs[2];
76  b -= filter_coeffs[0] * filter_coeffs[0];
77  c -= filter_coeffs[1] * filter_coeffs[0];
78  c -= filter_coeffs[0] * b;
79 
80  old_out0 = out[-4];
81  old_out1 = out[-3];
82  old_out2 = out[-2];
83  old_out3 = out[-1];
84  for (n = 0; n <= buffer_length - 4; n+=4) {
85  p_filter_coeffs = filter_coeffs;
86  p_out = out;
87 
88  out0 = in[0];
89  out1 = in[1];
90  out2 = in[2];
91  out3 = in[3];
92 
93  __asm__ volatile(
94  "lwc1 $f2, 8(%[filter_coeffs]) \n\t"
95  "lwc1 $f1, 4(%[filter_coeffs]) \n\t"
96  "lwc1 $f0, 0(%[filter_coeffs]) \n\t"
97  "nmsub.s %[out0], %[out0], $f2, %[old_out1] \n\t"
98  "nmsub.s %[out1], %[out1], $f2, %[old_out2] \n\t"
99  "nmsub.s %[out2], %[out2], $f2, %[old_out3] \n\t"
100  "lwc1 $f3, 12(%[filter_coeffs]) \n\t"
101  "nmsub.s %[out0], %[out0], $f1, %[old_out2] \n\t"
102  "nmsub.s %[out1], %[out1], $f1, %[old_out3] \n\t"
103  "nmsub.s %[out2], %[out2], $f3, %[old_out2] \n\t"
104  "nmsub.s %[out0], %[out0], $f0, %[old_out3] \n\t"
105  "nmsub.s %[out3], %[out3], $f3, %[old_out3] \n\t"
106  "nmsub.s %[out1], %[out1], $f3, %[old_out1] \n\t"
107  "nmsub.s %[out0], %[out0], $f3, %[old_out0] \n\t"
108 
109  : [out0]"+f"(out0), [out1]"+f"(out1),
110  [out2]"+f"(out2), [out3]"+f"(out3)
111  : [old_out0]"f"(old_out0), [old_out1]"f"(old_out1),
112  [old_out2]"f"(old_out2), [old_out3]"f"(old_out3),
113  [filter_coeffs]"r"(filter_coeffs)
114  : "$f0", "$f1", "$f2", "$f3", "$f4", "memory"
115  );
116 
117  for (i = 5; i <= filter_length; i += 2) {
118  __asm__ volatile(
119  "lwc1 %[old_out3], -20(%[p_out]) \n\t"
120  "lwc1 $f5, 16(%[p_filter_coeffs]) \n\t"
121  "addiu %[p_out], -8 \n\t"
122  "addiu %[p_filter_coeffs], 8 \n\t"
123  "nmsub.s %[out1], %[out1], $f5, %[old_out0] \n\t"
124  "nmsub.s %[out3], %[out3], $f5, %[old_out2] \n\t"
125  "lwc1 $f4, 12(%[p_filter_coeffs]) \n\t"
126  "lwc1 %[old_out2], -16(%[p_out]) \n\t"
127  "nmsub.s %[out0], %[out0], $f5, %[old_out3] \n\t"
128  "nmsub.s %[out2], %[out2], $f5, %[old_out1] \n\t"
129  "nmsub.s %[out1], %[out1], $f4, %[old_out3] \n\t"
130  "nmsub.s %[out3], %[out3], $f4, %[old_out1] \n\t"
131  "mov.s %[old_out1], %[old_out3] \n\t"
132  "nmsub.s %[out0], %[out0], $f4, %[old_out2] \n\t"
133  "nmsub.s %[out2], %[out2], $f4, %[old_out0] \n\t"
134 
135  : [out0]"+f"(out0), [out1]"+f"(out1),
136  [out2]"+f"(out2), [out3]"+f"(out3), [old_out0]"+f"(old_out0),
137  [old_out1]"+f"(old_out1), [old_out2]"+f"(old_out2),
138  [old_out3]"+f"(old_out3),[p_filter_coeffs]"+r"(p_filter_coeffs),
139  [p_out]"+r"(p_out)
140  :
141  : "$f4", "$f5", "memory"
142  );
143  FFSWAP(float, old_out0, old_out2);
144  }
145 
146  __asm__ volatile(
147  "nmsub.s %[out3], %[out3], %[a], %[out2] \n\t"
148  "nmsub.s %[out2], %[out2], %[a], %[out1] \n\t"
149  "nmsub.s %[out3], %[out3], %[b], %[out1] \n\t"
150  "nmsub.s %[out1], %[out1], %[a], %[out0] \n\t"
151  "nmsub.s %[out2], %[out2], %[b], %[out0] \n\t"
152  "nmsub.s %[out3], %[out3], %[c], %[out0] \n\t"
153 
154  : [out0]"+f"(out0), [out1]"+f"(out1),
155  [out2]"+f"(out2), [out3]"+f"(out3)
156  : [a]"f"(a), [b]"f"(b), [c]"f"(c)
157  );
158 
159  out[0] = out0;
160  out[1] = out1;
161  out[2] = out2;
162  out[3] = out3;
163 
164  old_out0 = out0;
165  old_out1 = out1;
166  old_out2 = out2;
167  old_out3 = out3;
168 
169  out += 4;
170  in += 4;
171  }
172 
173  out -= n;
174  in -= n;
175  for (; n < buffer_length; n++) {
176  float out_val, out_val_i, fc_val;
177  p_filter_coeffs = filter_coeffs;
178  p_out = &out[n];
179  out_val = in[n];
180  for (i = 1; i <= filter_length; i++) {
181  __asm__ volatile(
182  "lwc1 %[fc_val], 0(%[p_filter_coeffs]) \n\t"
183  "lwc1 %[out_val_i], -4(%[p_out]) \n\t"
184  "addiu %[p_filter_coeffs], 4 \n\t"
185  "addiu %[p_out], -4 \n\t"
186  "nmsub.s %[out_val], %[out_val], %[fc_val], %[out_val_i] \n\t"
187 
188  : [fc_val]"=&f"(fc_val), [out_val]"+f"(out_val),
189  [out_val_i]"=&f"(out_val_i), [p_out]"+r"(p_out),
190  [p_filter_coeffs]"+r"(p_filter_coeffs)
191  :
192  : "memory"
193  );
194  }
195  out[n] = out_val;
196  }
197 }
198 
199 static void ff_celp_lp_zero_synthesis_filterf_mips(float *out,
200  const float *filter_coeffs,
201  const float *in, int buffer_length,
202  int filter_length)
203 {
204  int i,n;
205  float sum_out8, sum_out7, sum_out6, sum_out5, sum_out4, fc_val;
206  float sum_out3, sum_out2, sum_out1;
207  const float *p_filter_coeffs, *p_in;
208 
209  for (n = 0; n < buffer_length; n+=8) {
210  p_in = &in[n];
211  p_filter_coeffs = filter_coeffs;
212  sum_out8 = in[n+7];
213  sum_out7 = in[n+6];
214  sum_out6 = in[n+5];
215  sum_out5 = in[n+4];
216  sum_out4 = in[n+3];
217  sum_out3 = in[n+2];
218  sum_out2 = in[n+1];
219  sum_out1 = in[n];
220  i = filter_length;
221 
222  /* i is always greater than 0
223  * outer loop is unrolled eight times so there is less memory access
224  * inner loop is unrolled two times
225  */
226  __asm__ volatile(
227  "filt_lp_inner%=: \n\t"
228  "lwc1 %[fc_val], 0(%[p_filter_coeffs]) \n\t"
229  "lwc1 $f7, 6*4(%[p_in]) \n\t"
230  "lwc1 $f6, 5*4(%[p_in]) \n\t"
231  "lwc1 $f5, 4*4(%[p_in]) \n\t"
232  "lwc1 $f4, 3*4(%[p_in]) \n\t"
233  "lwc1 $f3, 2*4(%[p_in]) \n\t"
234  "lwc1 $f2, 4(%[p_in]) \n\t"
235  "lwc1 $f1, 0(%[p_in]) \n\t"
236  "lwc1 $f0, -4(%[p_in]) \n\t"
237  "addiu %[i], -2 \n\t"
238  "madd.s %[sum_out8], %[sum_out8], %[fc_val], $f7 \n\t"
239  "madd.s %[sum_out7], %[sum_out7], %[fc_val], $f6 \n\t"
240  "madd.s %[sum_out6], %[sum_out6], %[fc_val], $f5 \n\t"
241  "madd.s %[sum_out5], %[sum_out5], %[fc_val], $f4 \n\t"
242  "madd.s %[sum_out4], %[sum_out4], %[fc_val], $f3 \n\t"
243  "madd.s %[sum_out3], %[sum_out3], %[fc_val], $f2 \n\t"
244  "madd.s %[sum_out2], %[sum_out2], %[fc_val], $f1 \n\t"
245  "madd.s %[sum_out1], %[sum_out1], %[fc_val], $f0 \n\t"
246  "lwc1 %[fc_val], 4(%[p_filter_coeffs]) \n\t"
247  "lwc1 $f7, -8(%[p_in]) \n\t"
248  "addiu %[p_filter_coeffs], 8 \n\t"
249  "addiu %[p_in], -8 \n\t"
250  "madd.s %[sum_out8], %[sum_out8], %[fc_val], $f6 \n\t"
251  "madd.s %[sum_out7], %[sum_out7], %[fc_val], $f5 \n\t"
252  "madd.s %[sum_out6], %[sum_out6], %[fc_val], $f4 \n\t"
253  "madd.s %[sum_out5], %[sum_out5], %[fc_val], $f3 \n\t"
254  "madd.s %[sum_out4], %[sum_out4], %[fc_val], $f2 \n\t"
255  "madd.s %[sum_out3], %[sum_out3], %[fc_val], $f1 \n\t"
256  "madd.s %[sum_out2], %[sum_out2], %[fc_val], $f0 \n\t"
257  "madd.s %[sum_out1], %[sum_out1], %[fc_val], $f7 \n\t"
258  "bgtz %[i], filt_lp_inner%= \n\t"
259 
260  : [sum_out8]"+f"(sum_out8), [sum_out7]"+f"(sum_out7),
261  [sum_out6]"+f"(sum_out6), [sum_out5]"+f"(sum_out5),
262  [sum_out4]"+f"(sum_out4), [sum_out3]"+f"(sum_out3),
263  [sum_out2]"+f"(sum_out2), [sum_out1]"+f"(sum_out1),
264  [fc_val]"=&f"(fc_val), [p_filter_coeffs]"+r"(p_filter_coeffs),
265  [p_in]"+r"(p_in), [i]"+r"(i)
266  :
267  : "$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7", "memory"
268  );
269 
270  out[n+7] = sum_out8;
271  out[n+6] = sum_out7;
272  out[n+5] = sum_out6;
273  out[n+4] = sum_out5;
274  out[n+3] = sum_out4;
275  out[n+2] = sum_out3;
276  out[n+1] = sum_out2;
277  out[n] = sum_out1;
278  }
279 }
280 #endif /* HAVE_INLINE_ASM */
281 
282 void ff_celp_filter_init_mips(CELPFContext *c)
283 {
284 #if HAVE_INLINE_ASM
285  c->celp_lp_synthesis_filterf = ff_celp_lp_synthesis_filterf_mips;
286  c->celp_lp_zero_synthesis_filterf = ff_celp_lp_zero_synthesis_filterf_mips;
287 #endif
288 }
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