4 * Copyright (C) 1999-2010 The L.A.M.E. project
6 * Initially written by Michael Hipp, see also AUTHORS and README.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
24 * Discrete Cosine Tansform (DCT) for subband synthesis
25 * optimized for machines with no auto-increment.
26 * The performance is highly compiler dependend. Maybe
27 * the dct64.c version for 'normal' processor may be faster
28 * even for Intel processors.
31 /* $Id: dct64_i386.c,v 1.14 2010/03/22 14:30:19 robert Exp $ */
37 #include "dct64_i386.h"
45 dct64_1(real * out0, real * out1, real * b1, real * b2, real * samples)
49 real *costab = pnts[0];
51 b1[0x00] = samples[0x00] + samples[0x1F];
52 b1[0x1F] = (samples[0x00] - samples[0x1F]) * costab[0x0];
54 b1[0x01] = samples[0x01] + samples[0x1E];
55 b1[0x1E] = (samples[0x01] - samples[0x1E]) * costab[0x1];
57 b1[0x02] = samples[0x02] + samples[0x1D];
58 b1[0x1D] = (samples[0x02] - samples[0x1D]) * costab[0x2];
60 b1[0x03] = samples[0x03] + samples[0x1C];
61 b1[0x1C] = (samples[0x03] - samples[0x1C]) * costab[0x3];
63 b1[0x04] = samples[0x04] + samples[0x1B];
64 b1[0x1B] = (samples[0x04] - samples[0x1B]) * costab[0x4];
66 b1[0x05] = samples[0x05] + samples[0x1A];
67 b1[0x1A] = (samples[0x05] - samples[0x1A]) * costab[0x5];
69 b1[0x06] = samples[0x06] + samples[0x19];
70 b1[0x19] = (samples[0x06] - samples[0x19]) * costab[0x6];
72 b1[0x07] = samples[0x07] + samples[0x18];
73 b1[0x18] = (samples[0x07] - samples[0x18]) * costab[0x7];
75 b1[0x08] = samples[0x08] + samples[0x17];
76 b1[0x17] = (samples[0x08] - samples[0x17]) * costab[0x8];
78 b1[0x09] = samples[0x09] + samples[0x16];
79 b1[0x16] = (samples[0x09] - samples[0x16]) * costab[0x9];
81 b1[0x0A] = samples[0x0A] + samples[0x15];
82 b1[0x15] = (samples[0x0A] - samples[0x15]) * costab[0xA];
84 b1[0x0B] = samples[0x0B] + samples[0x14];
85 b1[0x14] = (samples[0x0B] - samples[0x14]) * costab[0xB];
87 b1[0x0C] = samples[0x0C] + samples[0x13];
88 b1[0x13] = (samples[0x0C] - samples[0x13]) * costab[0xC];
90 b1[0x0D] = samples[0x0D] + samples[0x12];
91 b1[0x12] = (samples[0x0D] - samples[0x12]) * costab[0xD];
93 b1[0x0E] = samples[0x0E] + samples[0x11];
94 b1[0x11] = (samples[0x0E] - samples[0x11]) * costab[0xE];
96 b1[0x0F] = samples[0x0F] + samples[0x10];
97 b1[0x10] = (samples[0x0F] - samples[0x10]) * costab[0xF];
102 real *costab = pnts[1];
104 b2[0x00] = b1[0x00] + b1[0x0F];
105 b2[0x0F] = (b1[0x00] - b1[0x0F]) * costab[0];
106 b2[0x01] = b1[0x01] + b1[0x0E];
107 b2[0x0E] = (b1[0x01] - b1[0x0E]) * costab[1];
108 b2[0x02] = b1[0x02] + b1[0x0D];
109 b2[0x0D] = (b1[0x02] - b1[0x0D]) * costab[2];
110 b2[0x03] = b1[0x03] + b1[0x0C];
111 b2[0x0C] = (b1[0x03] - b1[0x0C]) * costab[3];
112 b2[0x04] = b1[0x04] + b1[0x0B];
113 b2[0x0B] = (b1[0x04] - b1[0x0B]) * costab[4];
114 b2[0x05] = b1[0x05] + b1[0x0A];
115 b2[0x0A] = (b1[0x05] - b1[0x0A]) * costab[5];
116 b2[0x06] = b1[0x06] + b1[0x09];
117 b2[0x09] = (b1[0x06] - b1[0x09]) * costab[6];
118 b2[0x07] = b1[0x07] + b1[0x08];
119 b2[0x08] = (b1[0x07] - b1[0x08]) * costab[7];
121 b2[0x10] = b1[0x10] + b1[0x1F];
122 b2[0x1F] = (b1[0x1F] - b1[0x10]) * costab[0];
123 b2[0x11] = b1[0x11] + b1[0x1E];
124 b2[0x1E] = (b1[0x1E] - b1[0x11]) * costab[1];
125 b2[0x12] = b1[0x12] + b1[0x1D];
126 b2[0x1D] = (b1[0x1D] - b1[0x12]) * costab[2];
127 b2[0x13] = b1[0x13] + b1[0x1C];
128 b2[0x1C] = (b1[0x1C] - b1[0x13]) * costab[3];
129 b2[0x14] = b1[0x14] + b1[0x1B];
130 b2[0x1B] = (b1[0x1B] - b1[0x14]) * costab[4];
131 b2[0x15] = b1[0x15] + b1[0x1A];
132 b2[0x1A] = (b1[0x1A] - b1[0x15]) * costab[5];
133 b2[0x16] = b1[0x16] + b1[0x19];
134 b2[0x19] = (b1[0x19] - b1[0x16]) * costab[6];
135 b2[0x17] = b1[0x17] + b1[0x18];
136 b2[0x18] = (b1[0x18] - b1[0x17]) * costab[7];
140 real *costab = pnts[2];
142 b1[0x00] = b2[0x00] + b2[0x07];
143 b1[0x07] = (b2[0x00] - b2[0x07]) * costab[0];
144 b1[0x01] = b2[0x01] + b2[0x06];
145 b1[0x06] = (b2[0x01] - b2[0x06]) * costab[1];
146 b1[0x02] = b2[0x02] + b2[0x05];
147 b1[0x05] = (b2[0x02] - b2[0x05]) * costab[2];
148 b1[0x03] = b2[0x03] + b2[0x04];
149 b1[0x04] = (b2[0x03] - b2[0x04]) * costab[3];
151 b1[0x08] = b2[0x08] + b2[0x0F];
152 b1[0x0F] = (b2[0x0F] - b2[0x08]) * costab[0];
153 b1[0x09] = b2[0x09] + b2[0x0E];
154 b1[0x0E] = (b2[0x0E] - b2[0x09]) * costab[1];
155 b1[0x0A] = b2[0x0A] + b2[0x0D];
156 b1[0x0D] = (b2[0x0D] - b2[0x0A]) * costab[2];
157 b1[0x0B] = b2[0x0B] + b2[0x0C];
158 b1[0x0C] = (b2[0x0C] - b2[0x0B]) * costab[3];
160 b1[0x10] = b2[0x10] + b2[0x17];
161 b1[0x17] = (b2[0x10] - b2[0x17]) * costab[0];
162 b1[0x11] = b2[0x11] + b2[0x16];
163 b1[0x16] = (b2[0x11] - b2[0x16]) * costab[1];
164 b1[0x12] = b2[0x12] + b2[0x15];
165 b1[0x15] = (b2[0x12] - b2[0x15]) * costab[2];
166 b1[0x13] = b2[0x13] + b2[0x14];
167 b1[0x14] = (b2[0x13] - b2[0x14]) * costab[3];
169 b1[0x18] = b2[0x18] + b2[0x1F];
170 b1[0x1F] = (b2[0x1F] - b2[0x18]) * costab[0];
171 b1[0x19] = b2[0x19] + b2[0x1E];
172 b1[0x1E] = (b2[0x1E] - b2[0x19]) * costab[1];
173 b1[0x1A] = b2[0x1A] + b2[0x1D];
174 b1[0x1D] = (b2[0x1D] - b2[0x1A]) * costab[2];
175 b1[0x1B] = b2[0x1B] + b2[0x1C];
176 b1[0x1C] = (b2[0x1C] - b2[0x1B]) * costab[3];
180 real const cos0 = pnts[3][0];
181 real const cos1 = pnts[3][1];
183 b2[0x00] = b1[0x00] + b1[0x03];
184 b2[0x03] = (b1[0x00] - b1[0x03]) * cos0;
185 b2[0x01] = b1[0x01] + b1[0x02];
186 b2[0x02] = (b1[0x01] - b1[0x02]) * cos1;
188 b2[0x04] = b1[0x04] + b1[0x07];
189 b2[0x07] = (b1[0x07] - b1[0x04]) * cos0;
190 b2[0x05] = b1[0x05] + b1[0x06];
191 b2[0x06] = (b1[0x06] - b1[0x05]) * cos1;
193 b2[0x08] = b1[0x08] + b1[0x0B];
194 b2[0x0B] = (b1[0x08] - b1[0x0B]) * cos0;
195 b2[0x09] = b1[0x09] + b1[0x0A];
196 b2[0x0A] = (b1[0x09] - b1[0x0A]) * cos1;
198 b2[0x0C] = b1[0x0C] + b1[0x0F];
199 b2[0x0F] = (b1[0x0F] - b1[0x0C]) * cos0;
200 b2[0x0D] = b1[0x0D] + b1[0x0E];
201 b2[0x0E] = (b1[0x0E] - b1[0x0D]) * cos1;
203 b2[0x10] = b1[0x10] + b1[0x13];
204 b2[0x13] = (b1[0x10] - b1[0x13]) * cos0;
205 b2[0x11] = b1[0x11] + b1[0x12];
206 b2[0x12] = (b1[0x11] - b1[0x12]) * cos1;
208 b2[0x14] = b1[0x14] + b1[0x17];
209 b2[0x17] = (b1[0x17] - b1[0x14]) * cos0;
210 b2[0x15] = b1[0x15] + b1[0x16];
211 b2[0x16] = (b1[0x16] - b1[0x15]) * cos1;
213 b2[0x18] = b1[0x18] + b1[0x1B];
214 b2[0x1B] = (b1[0x18] - b1[0x1B]) * cos0;
215 b2[0x19] = b1[0x19] + b1[0x1A];
216 b2[0x1A] = (b1[0x19] - b1[0x1A]) * cos1;
218 b2[0x1C] = b1[0x1C] + b1[0x1F];
219 b2[0x1F] = (b1[0x1F] - b1[0x1C]) * cos0;
220 b2[0x1D] = b1[0x1D] + b1[0x1E];
221 b2[0x1E] = (b1[0x1E] - b1[0x1D]) * cos1;
225 real const cos0 = pnts[4][0];
227 b1[0x00] = b2[0x00] + b2[0x01];
228 b1[0x01] = (b2[0x00] - b2[0x01]) * cos0;
229 b1[0x02] = b2[0x02] + b2[0x03];
230 b1[0x03] = (b2[0x03] - b2[0x02]) * cos0;
231 b1[0x02] += b1[0x03];
233 b1[0x04] = b2[0x04] + b2[0x05];
234 b1[0x05] = (b2[0x04] - b2[0x05]) * cos0;
235 b1[0x06] = b2[0x06] + b2[0x07];
236 b1[0x07] = (b2[0x07] - b2[0x06]) * cos0;
237 b1[0x06] += b1[0x07];
238 b1[0x04] += b1[0x06];
239 b1[0x06] += b1[0x05];
240 b1[0x05] += b1[0x07];
242 b1[0x08] = b2[0x08] + b2[0x09];
243 b1[0x09] = (b2[0x08] - b2[0x09]) * cos0;
244 b1[0x0A] = b2[0x0A] + b2[0x0B];
245 b1[0x0B] = (b2[0x0B] - b2[0x0A]) * cos0;
246 b1[0x0A] += b1[0x0B];
248 b1[0x0C] = b2[0x0C] + b2[0x0D];
249 b1[0x0D] = (b2[0x0C] - b2[0x0D]) * cos0;
250 b1[0x0E] = b2[0x0E] + b2[0x0F];
251 b1[0x0F] = (b2[0x0F] - b2[0x0E]) * cos0;
252 b1[0x0E] += b1[0x0F];
253 b1[0x0C] += b1[0x0E];
254 b1[0x0E] += b1[0x0D];
255 b1[0x0D] += b1[0x0F];
257 b1[0x10] = b2[0x10] + b2[0x11];
258 b1[0x11] = (b2[0x10] - b2[0x11]) * cos0;
259 b1[0x12] = b2[0x12] + b2[0x13];
260 b1[0x13] = (b2[0x13] - b2[0x12]) * cos0;
261 b1[0x12] += b1[0x13];
263 b1[0x14] = b2[0x14] + b2[0x15];
264 b1[0x15] = (b2[0x14] - b2[0x15]) * cos0;
265 b1[0x16] = b2[0x16] + b2[0x17];
266 b1[0x17] = (b2[0x17] - b2[0x16]) * cos0;
267 b1[0x16] += b1[0x17];
268 b1[0x14] += b1[0x16];
269 b1[0x16] += b1[0x15];
270 b1[0x15] += b1[0x17];
272 b1[0x18] = b2[0x18] + b2[0x19];
273 b1[0x19] = (b2[0x18] - b2[0x19]) * cos0;
274 b1[0x1A] = b2[0x1A] + b2[0x1B];
275 b1[0x1B] = (b2[0x1B] - b2[0x1A]) * cos0;
276 b1[0x1A] += b1[0x1B];
278 b1[0x1C] = b2[0x1C] + b2[0x1D];
279 b1[0x1D] = (b2[0x1C] - b2[0x1D]) * cos0;
280 b1[0x1E] = b2[0x1E] + b2[0x1F];
281 b1[0x1F] = (b2[0x1F] - b2[0x1E]) * cos0;
282 b1[0x1E] += b1[0x1F];
283 b1[0x1C] += b1[0x1E];
284 b1[0x1E] += b1[0x1D];
285 b1[0x1D] += b1[0x1F];
288 out0[0x10 * 16] = b1[0x00];
289 out0[0x10 * 12] = b1[0x04];
290 out0[0x10 * 8] = b1[0x02];
291 out0[0x10 * 4] = b1[0x06];
292 out0[0x10 * 0] = b1[0x01];
293 out1[0x10 * 0] = b1[0x01];
294 out1[0x10 * 4] = b1[0x05];
295 out1[0x10 * 8] = b1[0x03];
296 out1[0x10 * 12] = b1[0x07];
298 b1[0x08] += b1[0x0C];
299 out0[0x10 * 14] = b1[0x08];
300 b1[0x0C] += b1[0x0a];
301 out0[0x10 * 10] = b1[0x0C];
302 b1[0x0A] += b1[0x0E];
303 out0[0x10 * 6] = b1[0x0A];
304 b1[0x0E] += b1[0x09];
305 out0[0x10 * 2] = b1[0x0E];
306 b1[0x09] += b1[0x0D];
307 out1[0x10 * 2] = b1[0x09];
308 b1[0x0D] += b1[0x0B];
309 out1[0x10 * 6] = b1[0x0D];
310 b1[0x0B] += b1[0x0F];
311 out1[0x10 * 10] = b1[0x0B];
312 out1[0x10 * 14] = b1[0x0F];
314 b1[0x18] += b1[0x1C];
315 out0[0x10 * 15] = b1[0x10] + b1[0x18];
316 out0[0x10 * 13] = b1[0x18] + b1[0x14];
317 b1[0x1C] += b1[0x1a];
318 out0[0x10 * 11] = b1[0x14] + b1[0x1C];
319 out0[0x10 * 9] = b1[0x1C] + b1[0x12];
320 b1[0x1A] += b1[0x1E];
321 out0[0x10 * 7] = b1[0x12] + b1[0x1A];
322 out0[0x10 * 5] = b1[0x1A] + b1[0x16];
323 b1[0x1E] += b1[0x19];
324 out0[0x10 * 3] = b1[0x16] + b1[0x1E];
325 out0[0x10 * 1] = b1[0x1E] + b1[0x11];
326 b1[0x19] += b1[0x1D];
327 out1[0x10 * 1] = b1[0x11] + b1[0x19];
328 out1[0x10 * 3] = b1[0x19] + b1[0x15];
329 b1[0x1D] += b1[0x1B];
330 out1[0x10 * 5] = b1[0x15] + b1[0x1D];
331 out1[0x10 * 7] = b1[0x1D] + b1[0x13];
332 b1[0x1B] += b1[0x1F];
333 out1[0x10 * 9] = b1[0x13] + b1[0x1B];
334 out1[0x10 * 11] = b1[0x1B] + b1[0x17];
335 out1[0x10 * 13] = b1[0x17] + b1[0x1F];
336 out1[0x10 * 15] = b1[0x1F];
340 * the call via dct64 is a trick to force GCC to use
341 * (new) registers for the b1,b2 pointer to the bufs[xx] field
344 dct64(real * a, real * b, real * c)
347 dct64_1(a, b, bufs, bufs + 0x20, c);