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compute_antialias_float.h
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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
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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: Bojan Zivkovic (bojan@mips.com)
30  *
31  * Compute antialias function optimised for MIPS floating-point architecture
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/mpegaudiodec.c
53  */
54 
55 #ifndef AVCODEC_MIPS_COMPUTE_ANTIALIAS_FLOAT_H
56 #define AVCODEC_MIPS_COMPUTE_ANTIALIAS_FLOAT_H
57 
58 #if HAVE_INLINE_ASM
59 static void compute_antialias_mips_float(MPADecodeContext *s,
60  GranuleDef *g)
61 {
62  float *ptr, *ptr_end;
63  float *csa = &csa_table[0][0];
64  /* temporary variables */
65  float in1, in2, in3, in4, in5, in6, in7, in8;
66  float out1, out2, out3, out4;
67 
68  ptr = g->sb_hybrid + 18;
69  /* we antialias only "long" bands */
70  if (g->block_type == 2) {
71  if (!g->switch_point)
72  return;
73  /* XXX: check this for 8000Hz case */
74  ptr_end = ptr + 18;
75  } else {
76  ptr_end = ptr + 558;
77  }
78 
79  /**
80  * instructions are scheduled to minimize pipeline stall.
81  */
82 
83  __asm__ volatile (
84  "compute_antialias_float_loop%=: \t\n"
85  "lwc1 %[in1], -1*4(%[ptr]) \t\n"
86  "lwc1 %[in2], 0(%[csa]) \t\n"
87  "lwc1 %[in3], 1*4(%[csa]) \t\n"
88  "lwc1 %[in4], 0(%[ptr]) \t\n"
89  "lwc1 %[in5], -2*4(%[ptr]) \t\n"
90  "lwc1 %[in6], 4*4(%[csa]) \t\n"
91  "mul.s %[out1], %[in1], %[in2] \t\n"
92  "mul.s %[out2], %[in1], %[in3] \t\n"
93  "lwc1 %[in7], 5*4(%[csa]) \t\n"
94  "lwc1 %[in8], 1*4(%[ptr]) \t\n"
95  "nmsub.s %[out1], %[out1], %[in3], %[in4] \t\n"
96  "madd.s %[out2], %[out2], %[in2], %[in4] \t\n"
97  "mul.s %[out3], %[in5], %[in6] \t\n"
98  "mul.s %[out4], %[in5], %[in7] \t\n"
99  "lwc1 %[in1], -3*4(%[ptr]) \t\n"
100  "swc1 %[out1], -1*4(%[ptr]) \t\n"
101  "swc1 %[out2], 0(%[ptr]) \t\n"
102  "nmsub.s %[out3], %[out3], %[in7], %[in8] \t\n"
103  "madd.s %[out4], %[out4], %[in6], %[in8] \t\n"
104  "lwc1 %[in2], 8*4(%[csa]) \t\n"
105  "swc1 %[out3], -2*4(%[ptr]) \t\n"
106  "swc1 %[out4], 1*4(%[ptr]) \t\n"
107  "lwc1 %[in3], 9*4(%[csa]) \t\n"
108  "lwc1 %[in4], 2*4(%[ptr]) \t\n"
109  "mul.s %[out1], %[in1], %[in2] \t\n"
110  "lwc1 %[in5], -4*4(%[ptr]) \t\n"
111  "lwc1 %[in6], 12*4(%[csa]) \t\n"
112  "mul.s %[out2], %[in1], %[in3] \t\n"
113  "lwc1 %[in7], 13*4(%[csa]) \t\n"
114  "nmsub.s %[out1], %[out1], %[in3], %[in4] \t\n"
115  "lwc1 %[in8], 3*4(%[ptr]) \t\n"
116  "mul.s %[out3], %[in5], %[in6] \t\n"
117  "madd.s %[out2], %[out2], %[in2], %[in4] \t\n"
118  "mul.s %[out4], %[in5], %[in7] \t\n"
119  "swc1 %[out1], -3*4(%[ptr]) \t\n"
120  "lwc1 %[in1], -5*4(%[ptr]) \t\n"
121  "nmsub.s %[out3], %[out3], %[in7], %[in8] \t\n"
122  "swc1 %[out2], 2*4(%[ptr]) \t\n"
123  "madd.s %[out4], %[out4], %[in6], %[in8] \t\n"
124  "lwc1 %[in2], 16*4(%[csa]) \t\n"
125  "lwc1 %[in3], 17*4(%[csa]) \t\n"
126  "swc1 %[out3], -4*4(%[ptr]) \t\n"
127  "lwc1 %[in4], 4*4(%[ptr]) \t\n"
128  "swc1 %[out4], 3*4(%[ptr]) \t\n"
129  "mul.s %[out1], %[in1], %[in2] \t\n"
130  "mul.s %[out2], %[in1], %[in3] \t\n"
131  "lwc1 %[in5], -6*4(%[ptr]) \t\n"
132  "lwc1 %[in6], 20*4(%[csa]) \t\n"
133  "lwc1 %[in7], 21*4(%[csa]) \t\n"
134  "nmsub.s %[out1], %[out1], %[in3], %[in4] \t\n"
135  "madd.s %[out2], %[out2], %[in2], %[in4] \t\n"
136  "lwc1 %[in8], 5*4(%[ptr]) \t\n"
137  "mul.s %[out3], %[in5], %[in6] \t\n"
138  "mul.s %[out4], %[in5], %[in7] \t\n"
139  "swc1 %[out1], -5*4(%[ptr]) \t\n"
140  "swc1 %[out2], 4*4(%[ptr]) \t\n"
141  "lwc1 %[in1], -7*4(%[ptr]) \t\n"
142  "nmsub.s %[out3], %[out3], %[in7], %[in8] \t\n"
143  "madd.s %[out4], %[out4], %[in6], %[in8] \t\n"
144  "lwc1 %[in2], 24*4(%[csa]) \t\n"
145  "lwc1 %[in3], 25*4(%[csa]) \t\n"
146  "lwc1 %[in4], 6*4(%[ptr]) \t\n"
147  "swc1 %[out3], -6*4(%[ptr]) \t\n"
148  "swc1 %[out4], 5*4(%[ptr]) \t\n"
149  "mul.s %[out1], %[in1], %[in2] \t\n"
150  "lwc1 %[in5], -8*4(%[ptr]) \t\n"
151  "mul.s %[out2], %[in1], %[in3] \t\n"
152  "lwc1 %[in6], 28*4(%[csa]) \t\n"
153  "lwc1 %[in7], 29*4(%[csa]) \t\n"
154  "nmsub.s %[out1], %[out1], %[in3], %[in4] \t\n"
155  "lwc1 %[in8], 7*4(%[ptr]) \t\n"
156  "madd.s %[out2], %[out2], %[in2], %[in4] \t\n"
157  "mul.s %[out3], %[in5], %[in6] \t\n"
158  "mul.s %[out4], %[in5], %[in7] \t\n"
159  "swc1 %[out1], -7*4(%[ptr]) \t\n"
160  "swc1 %[out2], 6*4(%[ptr]) \t\n"
161  "addiu %[ptr], %[ptr], 72 \t\n"
162  "nmsub.s %[out3], %[out3], %[in7], %[in8] \t\n"
163  "madd.s %[out4], %[out4], %[in6], %[in8] \t\n"
164  "swc1 %[out3], -26*4(%[ptr]) \t\n"
165  "swc1 %[out4], -11*4(%[ptr]) \t\n"
166  "bne %[ptr], %[ptr_end], compute_antialias_float_loop%= \t\n"
167 
168  : [ptr] "+r" (ptr),
169  [in1] "=&f" (in1), [in2] "=&f" (in2),
170  [in3] "=&f" (in3), [in4] "=&f" (in4),
171  [in5] "=&f" (in5), [in6] "=&f" (in6),
172  [in7] "=&f" (in7), [in8] "=&f" (in8),
173  [out1] "=&f" (out1), [out2] "=&f" (out2),
174  [out3] "=&f" (out3), [out4] "=&f" (out4)
175  : [csa] "r" (csa), [ptr_end] "r" (ptr_end)
176  : "memory"
177  );
178 }
179 #define compute_antialias compute_antialias_mips_float
180 #endif /* HAVE_INLINE_ASM */
181 
182 #endif /* AVCODEC_MIPS_COMPUTE_ANTIALIAS_FLOAT_H */
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