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acelp_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 ACELP-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/acelp_filters.c
53  */
54 #include "config.h"
55 #include "libavutil/attributes.h"
56 #include "libavcodec/acelp_filters.h"
57 
58 #if HAVE_INLINE_ASM
59 static void ff_acelp_interpolatef_mips(float *out, const float *in,
60  const float *filter_coeffs, int precision,
61  int frac_pos, int filter_length, int length)
62 {
63  int n, i;
64  int prec = precision * 4;
65  int fc_offset = precision - frac_pos;
66  float in_val_p, in_val_m, fc_val_p, fc_val_m;
67 
68  for (n = 0; n < length; n++) {
69  /**
70  * four pointers are defined in order to minimize number of
71  * computations done in inner loop
72  */
73  const float *p_in_p = &in[n];
74  const float *p_in_m = &in[n-1];
75  const float *p_filter_coeffs_p = &filter_coeffs[frac_pos];
76  const float *p_filter_coeffs_m = filter_coeffs + fc_offset;
77  float v = 0;
78 
79  for (i = 0; i < filter_length;i++) {
80  __asm__ volatile (
81  "lwc1 %[in_val_p], 0(%[p_in_p]) \n\t"
82  "lwc1 %[fc_val_p], 0(%[p_filter_coeffs_p]) \n\t"
83  "lwc1 %[in_val_m], 0(%[p_in_m]) \n\t"
84  "lwc1 %[fc_val_m], 0(%[p_filter_coeffs_m]) \n\t"
85  "addiu %[p_in_p], %[p_in_p], 4 \n\t"
86  "madd.s %[v],%[v], %[in_val_p],%[fc_val_p] \n\t"
87  "addiu %[p_in_m], %[p_in_m], -4 \n\t"
88  "addu %[p_filter_coeffs_p], %[p_filter_coeffs_p], %[prec] \n\t"
89  "addu %[p_filter_coeffs_m], %[p_filter_coeffs_m], %[prec] \n\t"
90  "madd.s %[v],%[v],%[in_val_m], %[fc_val_m] \n\t"
91 
92  : [v] "=&f" (v),[p_in_p] "+r" (p_in_p), [p_in_m] "+r" (p_in_m),
93  [p_filter_coeffs_p] "+r" (p_filter_coeffs_p),
94  [in_val_p] "=&f" (in_val_p), [in_val_m] "=&f" (in_val_m),
95  [fc_val_p] "=&f" (fc_val_p), [fc_val_m] "=&f" (fc_val_m),
96  [p_filter_coeffs_m] "+r" (p_filter_coeffs_m)
97  : [prec] "r" (prec)
98  );
99  }
100  out[n] = v;
101  }
102 }
103 
104 static void ff_acelp_apply_order_2_transfer_function_mips(float *out, const float *in,
105  const float zero_coeffs[2],
106  const float pole_coeffs[2],
107  float gain, float mem[2], int n)
108 {
109  /**
110  * loop is unrolled eight times
111  */
112 
113  __asm__ volatile (
114  "lwc1 $f0, 0(%[mem]) \n\t"
115  "blez %[n], ff_acelp_apply_order_2_transfer_function_end%= \n\t"
116  "lwc1 $f1, 4(%[mem]) \n\t"
117  "lwc1 $f2, 0(%[pole_coeffs]) \n\t"
118  "lwc1 $f3, 4(%[pole_coeffs]) \n\t"
119  "lwc1 $f4, 0(%[zero_coeffs]) \n\t"
120  "lwc1 $f5, 4(%[zero_coeffs]) \n\t"
121 
122  "ff_acelp_apply_order_2_transfer_function_madd%=: \n\t"
123 
124  "lwc1 $f6, 0(%[in]) \n\t"
125  "mul.s $f9, $f3, $f1 \n\t"
126  "mul.s $f7, $f2, $f0 \n\t"
127  "msub.s $f7, $f7, %[gain], $f6 \n\t"
128  "sub.s $f7, $f7, $f9 \n\t"
129  "madd.s $f8, $f7, $f4, $f0 \n\t"
130  "madd.s $f8, $f8, $f5, $f1 \n\t"
131  "lwc1 $f11, 4(%[in]) \n\t"
132  "mul.s $f12, $f3, $f0 \n\t"
133  "mul.s $f13, $f2, $f7 \n\t"
134  "msub.s $f13, $f13, %[gain], $f11 \n\t"
135  "sub.s $f13, $f13, $f12 \n\t"
136  "madd.s $f14, $f13, $f4, $f7 \n\t"
137  "madd.s $f14, $f14, $f5, $f0 \n\t"
138  "swc1 $f8, 0(%[out]) \n\t"
139  "lwc1 $f6, 8(%[in]) \n\t"
140  "mul.s $f9, $f3, $f7 \n\t"
141  "mul.s $f15, $f2, $f13 \n\t"
142  "msub.s $f15, $f15, %[gain], $f6 \n\t"
143  "sub.s $f15, $f15, $f9 \n\t"
144  "madd.s $f8, $f15, $f4, $f13 \n\t"
145  "madd.s $f8, $f8, $f5, $f7 \n\t"
146  "swc1 $f14, 4(%[out]) \n\t"
147  "lwc1 $f11, 12(%[in]) \n\t"
148  "mul.s $f12, $f3, $f13 \n\t"
149  "mul.s $f16, $f2, $f15 \n\t"
150  "msub.s $f16, $f16, %[gain], $f11 \n\t"
151  "sub.s $f16, $f16, $f12 \n\t"
152  "madd.s $f14, $f16, $f4, $f15 \n\t"
153  "madd.s $f14, $f14, $f5, $f13 \n\t"
154  "swc1 $f8, 8(%[out]) \n\t"
155  "lwc1 $f6, 16(%[in]) \n\t"
156  "mul.s $f9, $f3, $f15 \n\t"
157  "mul.s $f7, $f2, $f16 \n\t"
158  "msub.s $f7, $f7, %[gain], $f6 \n\t"
159  "sub.s $f7, $f7, $f9 \n\t"
160  "madd.s $f8, $f7, $f4, $f16 \n\t"
161  "madd.s $f8, $f8, $f5, $f15 \n\t"
162  "swc1 $f14, 12(%[out]) \n\t"
163  "lwc1 $f11, 20(%[in]) \n\t"
164  "mul.s $f12, $f3, $f16 \n\t"
165  "mul.s $f13, $f2, $f7 \n\t"
166  "msub.s $f13, $f13, %[gain], $f11 \n\t"
167  "sub.s $f13, $f13, $f12 \n\t"
168  "madd.s $f14, $f13, $f4, $f7 \n\t"
169  "madd.s $f14, $f14, $f5, $f16 \n\t"
170  "swc1 $f8, 16(%[out]) \n\t"
171  "lwc1 $f6, 24(%[in]) \n\t"
172  "mul.s $f9, $f3, $f7 \n\t"
173  "mul.s $f15, $f2, $f13 \n\t"
174  "msub.s $f15, $f15, %[gain], $f6 \n\t"
175  "sub.s $f1, $f15, $f9 \n\t"
176  "madd.s $f8, $f1, $f4, $f13 \n\t"
177  "madd.s $f8, $f8, $f5, $f7 \n\t"
178  "swc1 $f14, 20(%[out]) \n\t"
179  "lwc1 $f11, 28(%[in]) \n\t"
180  "mul.s $f12, $f3, $f13 \n\t"
181  "mul.s $f16, $f2, $f1 \n\t"
182  "msub.s $f16, $f16, %[gain], $f11 \n\t"
183  "sub.s $f0, $f16, $f12 \n\t"
184  "madd.s $f14, $f0, $f4, $f1 \n\t"
185  "madd.s $f14, $f14, $f5, $f13 \n\t"
186  "swc1 $f8, 24(%[out]) \n\t"
187  "addiu %[out], 32 \n\t"
188  "addiu %[in], 32 \n\t"
189  "addiu %[n], -8 \n\t"
190  "swc1 $f14, -4(%[out]) \n\t"
191  "bnez %[n], ff_acelp_apply_order_2_transfer_function_madd%= \n\t"
192  "swc1 $f1, 4(%[mem]) \n\t"
193  "swc1 $f0, 0(%[mem]) \n\t"
194 
195  "ff_acelp_apply_order_2_transfer_function_end%=: \n\t"
196 
197  : [out] "+r" (out),
198  [in] "+r" (in), [gain] "+f" (gain),
199  [n] "+r" (n), [mem] "+r" (mem)
200  : [zero_coeffs] "r" (zero_coeffs),
201  [pole_coeffs] "r" (pole_coeffs)
202  : "$f0", "$f1", "$f2", "$f3", "$f4", "$f5",
203  "$f6", "$f7", "$f8", "$f9", "$f10", "$f11",
204  "$f12", "$f13", "$f14", "$f15", "$f16"
205  );
206 }
207 #endif /* HAVE_INLINE_ASM */
208 
209 void ff_acelp_filter_init_mips(ACELPFContext *c)
210 {
211 #if HAVE_INLINE_ASM
212  c->acelp_interpolatef = ff_acelp_interpolatef_mips;
213  c->acelp_apply_order_2_transfer_function = ff_acelp_apply_order_2_transfer_function_mips;
214 #endif
215 }
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