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comparison: media/libtheora/lib/x86/mmxidct.c

media/libtheora/lib/x86/mmxidct.c

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1 /********************************************************************
2 * *
3 * THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
7 * *
8 * THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
9 * by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
10 * *
11 ********************************************************************
12
13 function:
14 last mod: $Id: mmxidct.c 17446 2010-09-23 20:06:20Z tterribe $
15
16 ********************************************************************/
17
18 /*MMX acceleration of Theora's iDCT.
19 Originally written by Rudolf Marek, based on code from On2's VP3.*/
20 #include "x86int.h"
21 #include "../dct.h"
22
23 #if defined(OC_X86_ASM)
24
25 /*These are offsets into the table of constants below.*/
26 /*7 rows of cosines, in order: pi/16 * (1 ... 7).*/
27 #define OC_COSINE_OFFSET (0)
28 /*A row of 8's.*/
29 #define OC_EIGHT_OFFSET (56)
30
31
32
33 /*38 cycles*/
34 #define OC_IDCT_BEGIN(_y,_x) \
35 "#OC_IDCT_BEGIN\n\t" \
36 "movq "OC_I(3,_x)",%%mm2\n\t" \
37 "movq "OC_MEM_OFFS(0x30,c)",%%mm6\n\t" \
38 "movq %%mm2,%%mm4\n\t" \
39 "movq "OC_J(5,_x)",%%mm7\n\t" \
40 "pmulhw %%mm6,%%mm4\n\t" \
41 "movq "OC_MEM_OFFS(0x50,c)",%%mm1\n\t" \
42 "pmulhw %%mm7,%%mm6\n\t" \
43 "movq %%mm1,%%mm5\n\t" \
44 "pmulhw %%mm2,%%mm1\n\t" \
45 "movq "OC_I(1,_x)",%%mm3\n\t" \
46 "pmulhw %%mm7,%%mm5\n\t" \
47 "movq "OC_MEM_OFFS(0x10,c)",%%mm0\n\t" \
48 "paddw %%mm2,%%mm4\n\t" \
49 "paddw %%mm7,%%mm6\n\t" \
50 "paddw %%mm1,%%mm2\n\t" \
51 "movq "OC_J(7,_x)",%%mm1\n\t" \
52 "paddw %%mm5,%%mm7\n\t" \
53 "movq %%mm0,%%mm5\n\t" \
54 "pmulhw %%mm3,%%mm0\n\t" \
55 "paddw %%mm7,%%mm4\n\t" \
56 "pmulhw %%mm1,%%mm5\n\t" \
57 "movq "OC_MEM_OFFS(0x70,c)",%%mm7\n\t" \
58 "psubw %%mm2,%%mm6\n\t" \
59 "paddw %%mm3,%%mm0\n\t" \
60 "pmulhw %%mm7,%%mm3\n\t" \
61 "movq "OC_I(2,_x)",%%mm2\n\t" \
62 "pmulhw %%mm1,%%mm7\n\t" \
63 "paddw %%mm1,%%mm5\n\t" \
64 "movq %%mm2,%%mm1\n\t" \
65 "pmulhw "OC_MEM_OFFS(0x20,c)",%%mm2\n\t" \
66 "psubw %%mm5,%%mm3\n\t" \
67 "movq "OC_J(6,_x)",%%mm5\n\t" \
68 "paddw %%mm7,%%mm0\n\t" \
69 "movq %%mm5,%%mm7\n\t" \
70 "psubw %%mm4,%%mm0\n\t" \
71 "pmulhw "OC_MEM_OFFS(0x20,c)",%%mm5\n\t" \
72 "paddw %%mm1,%%mm2\n\t" \
73 "pmulhw "OC_MEM_OFFS(0x60,c)",%%mm1\n\t" \
74 "paddw %%mm4,%%mm4\n\t" \
75 "paddw %%mm0,%%mm4\n\t" \
76 "psubw %%mm6,%%mm3\n\t" \
77 "paddw %%mm7,%%mm5\n\t" \
78 "paddw %%mm6,%%mm6\n\t" \
79 "pmulhw "OC_MEM_OFFS(0x60,c)",%%mm7\n\t" \
80 "paddw %%mm3,%%mm6\n\t" \
81 "movq %%mm4,"OC_I(1,_y)"\n\t" \
82 "psubw %%mm5,%%mm1\n\t" \
83 "movq "OC_MEM_OFFS(0x40,c)",%%mm4\n\t" \
84 "movq %%mm3,%%mm5\n\t" \
85 "pmulhw %%mm4,%%mm3\n\t" \
86 "paddw %%mm2,%%mm7\n\t" \
87 "movq %%mm6,"OC_I(2,_y)"\n\t" \
88 "movq %%mm0,%%mm2\n\t" \
89 "movq "OC_I(0,_x)",%%mm6\n\t" \
90 "pmulhw %%mm4,%%mm0\n\t" \
91 "paddw %%mm3,%%mm5\n\t" \
92 "movq "OC_J(4,_x)",%%mm3\n\t" \
93 "psubw %%mm1,%%mm5\n\t" \
94 "paddw %%mm0,%%mm2\n\t" \
95 "psubw %%mm3,%%mm6\n\t" \
96 "movq %%mm6,%%mm0\n\t" \
97 "pmulhw %%mm4,%%mm6\n\t" \
98 "paddw %%mm3,%%mm3\n\t" \
99 "paddw %%mm1,%%mm1\n\t" \
100 "paddw %%mm0,%%mm3\n\t" \
101 "paddw %%mm5,%%mm1\n\t" \
102 "pmulhw %%mm3,%%mm4\n\t" \
103 "paddw %%mm0,%%mm6\n\t" \
104 "psubw %%mm2,%%mm6\n\t" \
105 "paddw %%mm2,%%mm2\n\t" \
106 "movq "OC_I(1,_y)",%%mm0\n\t" \
107 "paddw %%mm6,%%mm2\n\t" \
108 "paddw %%mm3,%%mm4\n\t" \
109 "psubw %%mm1,%%mm2\n\t" \
110 "#end OC_IDCT_BEGIN\n\t" \
111
112 /*38+8=46 cycles.*/
113 #define OC_ROW_IDCT(_y,_x) \
114 "#OC_ROW_IDCT\n" \
115 OC_IDCT_BEGIN(_y,_x) \
116 /*r3=D'*/ \
117 "movq "OC_I(2,_y)",%%mm3\n\t" \
118 /*r4=E'=E-G*/ \
119 "psubw %%mm7,%%mm4\n\t" \
120 /*r1=H'+H'*/ \
121 "paddw %%mm1,%%mm1\n\t" \
122 /*r7=G+G*/ \
123 "paddw %%mm7,%%mm7\n\t" \
124 /*r1=R1=A''+H'*/ \
125 "paddw %%mm2,%%mm1\n\t" \
126 /*r7=G'=E+G*/ \
127 "paddw %%mm4,%%mm7\n\t" \
128 /*r4=R4=E'-D'*/ \
129 "psubw %%mm3,%%mm4\n\t" \
130 "paddw %%mm3,%%mm3\n\t" \
131 /*r6=R6=F'-B''*/ \
132 "psubw %%mm5,%%mm6\n\t" \
133 "paddw %%mm5,%%mm5\n\t" \
134 /*r3=R3=E'+D'*/ \
135 "paddw %%mm4,%%mm3\n\t" \
136 /*r5=R5=F'+B''*/ \
137 "paddw %%mm6,%%mm5\n\t" \
138 /*r7=R7=G'-C'*/ \
139 "psubw %%mm0,%%mm7\n\t" \
140 "paddw %%mm0,%%mm0\n\t" \
141 /*Save R1.*/ \
142 "movq %%mm1,"OC_I(1,_y)"\n\t" \
143 /*r0=R0=G.+C.*/ \
144 "paddw %%mm7,%%mm0\n\t" \
145 "#end OC_ROW_IDCT\n\t" \
146
147 /*The following macro does two 4x4 transposes in place.
148 At entry, we assume:
149 r0 = a3 a2 a1 a0
150 I(1) = b3 b2 b1 b0
151 r2 = c3 c2 c1 c0
152 r3 = d3 d2 d1 d0
153
154 r4 = e3 e2 e1 e0
155 r5 = f3 f2 f1 f0
156 r6 = g3 g2 g1 g0
157 r7 = h3 h2 h1 h0
158
159 At exit, we have:
160 I(0) = d0 c0 b0 a0
161 I(1) = d1 c1 b1 a1
162 I(2) = d2 c2 b2 a2
163 I(3) = d3 c3 b3 a3
164
165 J(4) = h0 g0 f0 e0
166 J(5) = h1 g1 f1 e1
167 J(6) = h2 g2 f2 e2
168 J(7) = h3 g3 f3 e3
169
170 I(0) I(1) I(2) I(3) is the transpose of r0 I(1) r2 r3.
171 J(4) J(5) J(6) J(7) is the transpose of r4 r5 r6 r7.
172
173 Since r1 is free at entry, we calculate the Js first.*/
174 /*19 cycles.*/
175 #define OC_TRANSPOSE(_y) \
176 "#OC_TRANSPOSE\n\t" \
177 "movq %%mm4,%%mm1\n\t" \
178 "punpcklwd %%mm5,%%mm4\n\t" \
179 "movq %%mm0,"OC_I(0,_y)"\n\t" \
180 "punpckhwd %%mm5,%%mm1\n\t" \
181 "movq %%mm6,%%mm0\n\t" \
182 "punpcklwd %%mm7,%%mm6\n\t" \
183 "movq %%mm4,%%mm5\n\t" \
184 "punpckldq %%mm6,%%mm4\n\t" \
185 "punpckhdq %%mm6,%%mm5\n\t" \
186 "movq %%mm1,%%mm6\n\t" \
187 "movq %%mm4,"OC_J(4,_y)"\n\t" \
188 "punpckhwd %%mm7,%%mm0\n\t" \
189 "movq %%mm5,"OC_J(5,_y)"\n\t" \
190 "punpckhdq %%mm0,%%mm6\n\t" \
191 "movq "OC_I(0,_y)",%%mm4\n\t" \
192 "punpckldq %%mm0,%%mm1\n\t" \
193 "movq "OC_I(1,_y)",%%mm5\n\t" \
194 "movq %%mm4,%%mm0\n\t" \
195 "movq %%mm6,"OC_J(7,_y)"\n\t" \
196 "punpcklwd %%mm5,%%mm0\n\t" \
197 "movq %%mm1,"OC_J(6,_y)"\n\t" \
198 "punpckhwd %%mm5,%%mm4\n\t" \
199 "movq %%mm2,%%mm5\n\t" \
200 "punpcklwd %%mm3,%%mm2\n\t" \
201 "movq %%mm0,%%mm1\n\t" \
202 "punpckldq %%mm2,%%mm0\n\t" \
203 "punpckhdq %%mm2,%%mm1\n\t" \
204 "movq %%mm4,%%mm2\n\t" \
205 "movq %%mm0,"OC_I(0,_y)"\n\t" \
206 "punpckhwd %%mm3,%%mm5\n\t" \
207 "movq %%mm1,"OC_I(1,_y)"\n\t" \
208 "punpckhdq %%mm5,%%mm4\n\t" \
209 "punpckldq %%mm5,%%mm2\n\t" \
210 "movq %%mm4,"OC_I(3,_y)"\n\t" \
211 "movq %%mm2,"OC_I(2,_y)"\n\t" \
212 "#end OC_TRANSPOSE\n\t" \
213
214 /*38+19=57 cycles.*/
215 #define OC_COLUMN_IDCT(_y) \
216 "#OC_COLUMN_IDCT\n" \
217 OC_IDCT_BEGIN(_y,_y) \
218 "paddw "OC_MEM_OFFS(0x00,c)",%%mm2\n\t" \
219 /*r1=H'+H'*/ \
220 "paddw %%mm1,%%mm1\n\t" \
221 /*r1=R1=A''+H'*/ \
222 "paddw %%mm2,%%mm1\n\t" \
223 /*r2=NR2*/ \
224 "psraw $4,%%mm2\n\t" \
225 /*r4=E'=E-G*/ \
226 "psubw %%mm7,%%mm4\n\t" \
227 /*r1=NR1*/ \
228 "psraw $4,%%mm1\n\t" \
229 /*r3=D'*/ \
230 "movq "OC_I(2,_y)",%%mm3\n\t" \
231 /*r7=G+G*/ \
232 "paddw %%mm7,%%mm7\n\t" \
233 /*Store NR2 at I(2).*/ \
234 "movq %%mm2,"OC_I(2,_y)"\n\t" \
235 /*r7=G'=E+G*/ \
236 "paddw %%mm4,%%mm7\n\t" \
237 /*Store NR1 at I(1).*/ \
238 "movq %%mm1,"OC_I(1,_y)"\n\t" \
239 /*r4=R4=E'-D'*/ \
240 "psubw %%mm3,%%mm4\n\t" \
241 "paddw "OC_MEM_OFFS(0x00,c)",%%mm4\n\t" \
242 /*r3=D'+D'*/ \
243 "paddw %%mm3,%%mm3\n\t" \
244 /*r3=R3=E'+D'*/ \
245 "paddw %%mm4,%%mm3\n\t" \
246 /*r4=NR4*/ \
247 "psraw $4,%%mm4\n\t" \
248 /*r6=R6=F'-B''*/ \
249 "psubw %%mm5,%%mm6\n\t" \
250 /*r3=NR3*/ \
251 "psraw $4,%%mm3\n\t" \
252 "paddw "OC_MEM_OFFS(0x00,c)",%%mm6\n\t" \
253 /*r5=B''+B''*/ \
254 "paddw %%mm5,%%mm5\n\t" \
255 /*r5=R5=F'+B''*/ \
256 "paddw %%mm6,%%mm5\n\t" \
257 /*r6=NR6*/ \
258 "psraw $4,%%mm6\n\t" \
259 /*Store NR4 at J(4).*/ \
260 "movq %%mm4,"OC_J(4,_y)"\n\t" \
261 /*r5=NR5*/ \
262 "psraw $4,%%mm5\n\t" \
263 /*Store NR3 at I(3).*/ \
264 "movq %%mm3,"OC_I(3,_y)"\n\t" \
265 /*r7=R7=G'-C'*/ \
266 "psubw %%mm0,%%mm7\n\t" \
267 "paddw "OC_MEM_OFFS(0x00,c)",%%mm7\n\t" \
268 /*r0=C'+C'*/ \
269 "paddw %%mm0,%%mm0\n\t" \
270 /*r0=R0=G'+C'*/ \
271 "paddw %%mm7,%%mm0\n\t" \
272 /*r7=NR7*/ \
273 "psraw $4,%%mm7\n\t" \
274 /*Store NR6 at J(6).*/ \
275 "movq %%mm6,"OC_J(6,_y)"\n\t" \
276 /*r0=NR0*/ \
277 "psraw $4,%%mm0\n\t" \
278 /*Store NR5 at J(5).*/ \
279 "movq %%mm5,"OC_J(5,_y)"\n\t" \
280 /*Store NR7 at J(7).*/ \
281 "movq %%mm7,"OC_J(7,_y)"\n\t" \
282 /*Store NR0 at I(0).*/ \
283 "movq %%mm0,"OC_I(0,_y)"\n\t" \
284 "#end OC_COLUMN_IDCT\n\t" \
285
286 static void oc_idct8x8_slow_mmx(ogg_int16_t _y[64],ogg_int16_t _x[64]){
287 /*This routine accepts an 8x8 matrix, but in partially transposed form.
288 Every 4x4 block is transposed.*/
289 __asm__ __volatile__(
290 #define OC_I(_k,_y) OC_MEM_OFFS((_k)*16,_y)
291 #define OC_J(_k,_y) OC_MEM_OFFS(((_k)-4)*16+8,_y)
292 OC_ROW_IDCT(y,x)
293 OC_TRANSPOSE(y)
294 #undef OC_I
295 #undef OC_J
296 #define OC_I(_k,_y) OC_MEM_OFFS((_k)*16+64,_y)
297 #define OC_J(_k,_y) OC_MEM_OFFS(((_k)-4)*16+72,_y)
298 OC_ROW_IDCT(y,x)
299 OC_TRANSPOSE(y)
300 #undef OC_I
301 #undef OC_J
302 #define OC_I(_k,_y) OC_MEM_OFFS((_k)*16,_y)
303 #define OC_J(_k,_y) OC_I(_k,_y)
304 OC_COLUMN_IDCT(y)
305 #undef OC_I
306 #undef OC_J
307 #define OC_I(_k,_y) OC_MEM_OFFS((_k)*16+8,_y)
308 #define OC_J(_k,_y) OC_I(_k,_y)
309 OC_COLUMN_IDCT(y)
310 #undef OC_I
311 #undef OC_J
312 :[y]"=m"OC_ARRAY_OPERAND(ogg_int16_t,_y,64)
313 :[x]"m"OC_CONST_ARRAY_OPERAND(ogg_int16_t,_x,64),
314 [c]"m"OC_CONST_ARRAY_OPERAND(ogg_int16_t,OC_IDCT_CONSTS,128)
315 );
316 if(_x!=_y){
317 int i;
318 __asm__ __volatile__("pxor %%mm0,%%mm0\n\t"::);
319 for(i=0;i<4;i++){
320 __asm__ __volatile__(
321 "movq %%mm0,"OC_MEM_OFFS(0x00,x)"\n\t"
322 "movq %%mm0,"OC_MEM_OFFS(0x08,x)"\n\t"
323 "movq %%mm0,"OC_MEM_OFFS(0x10,x)"\n\t"
324 "movq %%mm0,"OC_MEM_OFFS(0x18,x)"\n\t"
325 :[x]"=m"OC_ARRAY_OPERAND(ogg_int16_t,_x+16*i,16)
326 );
327 }
328 }
329 }
330
331 /*25 cycles.*/
332 #define OC_IDCT_BEGIN_10(_y,_x) \
333 "#OC_IDCT_BEGIN_10\n\t" \
334 "movq "OC_I(3,_x)",%%mm2\n\t" \
335 "nop\n\t" \
336 "movq "OC_MEM_OFFS(0x30,c)",%%mm6\n\t" \
337 "movq %%mm2,%%mm4\n\t" \
338 "movq "OC_MEM_OFFS(0x50,c)",%%mm1\n\t" \
339 "pmulhw %%mm6,%%mm4\n\t" \
340 "movq "OC_I(1,_x)",%%mm3\n\t" \
341 "pmulhw %%mm2,%%mm1\n\t" \
342 "movq "OC_MEM_OFFS(0x10,c)",%%mm0\n\t" \
343 "paddw %%mm2,%%mm4\n\t" \
344 "pxor %%mm6,%%mm6\n\t" \
345 "paddw %%mm1,%%mm2\n\t" \
346 "movq "OC_I(2,_x)",%%mm5\n\t" \
347 "pmulhw %%mm3,%%mm0\n\t" \
348 "movq %%mm5,%%mm1\n\t" \
349 "paddw %%mm3,%%mm0\n\t" \
350 "pmulhw "OC_MEM_OFFS(0x70,c)",%%mm3\n\t" \
351 "psubw %%mm2,%%mm6\n\t" \
352 "pmulhw "OC_MEM_OFFS(0x20,c)",%%mm5\n\t" \
353 "psubw %%mm4,%%mm0\n\t" \
354 "movq "OC_I(2,_x)",%%mm7\n\t" \
355 "paddw %%mm4,%%mm4\n\t" \
356 "paddw %%mm5,%%mm7\n\t" \
357 "paddw %%mm0,%%mm4\n\t" \
358 "pmulhw "OC_MEM_OFFS(0x60,c)",%%mm1\n\t" \
359 "psubw %%mm6,%%mm3\n\t" \
360 "movq %%mm4,"OC_I(1,_y)"\n\t" \
361 "paddw %%mm6,%%mm6\n\t" \
362 "movq "OC_MEM_OFFS(0x40,c)",%%mm4\n\t" \
363 "paddw %%mm3,%%mm6\n\t" \
364 "movq %%mm3,%%mm5\n\t" \
365 "pmulhw %%mm4,%%mm3\n\t" \
366 "movq %%mm6,"OC_I(2,_y)"\n\t" \
367 "movq %%mm0,%%mm2\n\t" \
368 "movq "OC_I(0,_x)",%%mm6\n\t" \
369 "pmulhw %%mm4,%%mm0\n\t" \
370 "paddw %%mm3,%%mm5\n\t" \
371 "paddw %%mm0,%%mm2\n\t" \
372 "psubw %%mm1,%%mm5\n\t" \
373 "pmulhw %%mm4,%%mm6\n\t" \
374 "paddw "OC_I(0,_x)",%%mm6\n\t" \
375 "paddw %%mm1,%%mm1\n\t" \
376 "movq %%mm6,%%mm4\n\t" \
377 "paddw %%mm5,%%mm1\n\t" \
378 "psubw %%mm2,%%mm6\n\t" \
379 "paddw %%mm2,%%mm2\n\t" \
380 "movq "OC_I(1,_y)",%%mm0\n\t" \
381 "paddw %%mm6,%%mm2\n\t" \
382 "psubw %%mm1,%%mm2\n\t" \
383 "nop\n\t" \
384 "#end OC_IDCT_BEGIN_10\n\t" \
385
386 /*25+8=33 cycles.*/
387 #define OC_ROW_IDCT_10(_y,_x) \
388 "#OC_ROW_IDCT_10\n\t" \
389 OC_IDCT_BEGIN_10(_y,_x) \
390 /*r3=D'*/ \
391 "movq "OC_I(2,_y)",%%mm3\n\t" \
392 /*r4=E'=E-G*/ \
393 "psubw %%mm7,%%mm4\n\t" \
394 /*r1=H'+H'*/ \
395 "paddw %%mm1,%%mm1\n\t" \
396 /*r7=G+G*/ \
397 "paddw %%mm7,%%mm7\n\t" \
398 /*r1=R1=A''+H'*/ \
399 "paddw %%mm2,%%mm1\n\t" \
400 /*r7=G'=E+G*/ \
401 "paddw %%mm4,%%mm7\n\t" \
402 /*r4=R4=E'-D'*/ \
403 "psubw %%mm3,%%mm4\n\t" \
404 "paddw %%mm3,%%mm3\n\t" \
405 /*r6=R6=F'-B''*/ \
406 "psubw %%mm5,%%mm6\n\t" \
407 "paddw %%mm5,%%mm5\n\t" \
408 /*r3=R3=E'+D'*/ \
409 "paddw %%mm4,%%mm3\n\t" \
410 /*r5=R5=F'+B''*/ \
411 "paddw %%mm6,%%mm5\n\t" \
412 /*r7=R7=G'-C'*/ \
413 "psubw %%mm0,%%mm7\n\t" \
414 "paddw %%mm0,%%mm0\n\t" \
415 /*Save R1.*/ \
416 "movq %%mm1,"OC_I(1,_y)"\n\t" \
417 /*r0=R0=G'+C'*/ \
418 "paddw %%mm7,%%mm0\n\t" \
419 "#end OC_ROW_IDCT_10\n\t" \
420
421 /*25+19=44 cycles'*/
422 #define OC_COLUMN_IDCT_10(_y) \
423 "#OC_COLUMN_IDCT_10\n\t" \
424 OC_IDCT_BEGIN_10(_y,_y) \
425 "paddw "OC_MEM_OFFS(0x00,c)",%%mm2\n\t" \
426 /*r1=H'+H'*/ \
427 "paddw %%mm1,%%mm1\n\t" \
428 /*r1=R1=A''+H'*/ \
429 "paddw %%mm2,%%mm1\n\t" \
430 /*r2=NR2*/ \
431 "psraw $4,%%mm2\n\t" \
432 /*r4=E'=E-G*/ \
433 "psubw %%mm7,%%mm4\n\t" \
434 /*r1=NR1*/ \
435 "psraw $4,%%mm1\n\t" \
436 /*r3=D'*/ \
437 "movq "OC_I(2,_y)",%%mm3\n\t" \
438 /*r7=G+G*/ \
439 "paddw %%mm7,%%mm7\n\t" \
440 /*Store NR2 at I(2).*/ \
441 "movq %%mm2,"OC_I(2,_y)"\n\t" \
442 /*r7=G'=E+G*/ \
443 "paddw %%mm4,%%mm7\n\t" \
444 /*Store NR1 at I(1).*/ \
445 "movq %%mm1,"OC_I(1,_y)"\n\t" \
446 /*r4=R4=E'-D'*/ \
447 "psubw %%mm3,%%mm4\n\t" \
448 "paddw "OC_MEM_OFFS(0x00,c)",%%mm4\n\t" \
449 /*r3=D'+D'*/ \
450 "paddw %%mm3,%%mm3\n\t" \
451 /*r3=R3=E'+D'*/ \
452 "paddw %%mm4,%%mm3\n\t" \
453 /*r4=NR4*/ \
454 "psraw $4,%%mm4\n\t" \
455 /*r6=R6=F'-B''*/ \
456 "psubw %%mm5,%%mm6\n\t" \
457 /*r3=NR3*/ \
458 "psraw $4,%%mm3\n\t" \
459 "paddw "OC_MEM_OFFS(0x00,c)",%%mm6\n\t" \
460 /*r5=B''+B''*/ \
461 "paddw %%mm5,%%mm5\n\t" \
462 /*r5=R5=F'+B''*/ \
463 "paddw %%mm6,%%mm5\n\t" \
464 /*r6=NR6*/ \
465 "psraw $4,%%mm6\n\t" \
466 /*Store NR4 at J(4).*/ \
467 "movq %%mm4,"OC_J(4,_y)"\n\t" \
468 /*r5=NR5*/ \
469 "psraw $4,%%mm5\n\t" \
470 /*Store NR3 at I(3).*/ \
471 "movq %%mm3,"OC_I(3,_y)"\n\t" \
472 /*r7=R7=G'-C'*/ \
473 "psubw %%mm0,%%mm7\n\t" \
474 "paddw "OC_MEM_OFFS(0x00,c)",%%mm7\n\t" \
475 /*r0=C'+C'*/ \
476 "paddw %%mm0,%%mm0\n\t" \
477 /*r0=R0=G'+C'*/ \
478 "paddw %%mm7,%%mm0\n\t" \
479 /*r7=NR7*/ \
480 "psraw $4,%%mm7\n\t" \
481 /*Store NR6 at J(6).*/ \
482 "movq %%mm6,"OC_J(6,_y)"\n\t" \
483 /*r0=NR0*/ \
484 "psraw $4,%%mm0\n\t" \
485 /*Store NR5 at J(5).*/ \
486 "movq %%mm5,"OC_J(5,_y)"\n\t" \
487 /*Store NR7 at J(7).*/ \
488 "movq %%mm7,"OC_J(7,_y)"\n\t" \
489 /*Store NR0 at I(0).*/ \
490 "movq %%mm0,"OC_I(0,_y)"\n\t" \
491 "#end OC_COLUMN_IDCT_10\n\t" \
492
493 static void oc_idct8x8_10_mmx(ogg_int16_t _y[64],ogg_int16_t _x[64]){
494 __asm__ __volatile__(
495 #define OC_I(_k,_y) OC_MEM_OFFS((_k)*16,_y)
496 #define OC_J(_k,_y) OC_MEM_OFFS(((_k)-4)*16+8,_y)
497 /*Done with dequant, descramble, and partial transpose.
498 Now do the iDCT itself.*/
499 OC_ROW_IDCT_10(y,x)
500 OC_TRANSPOSE(y)
501 #undef OC_I
502 #undef OC_J
503 #define OC_I(_k,_y) OC_MEM_OFFS((_k)*16,_y)
504 #define OC_J(_k,_y) OC_I(_k,_y)
505 OC_COLUMN_IDCT_10(y)
506 #undef OC_I
507 #undef OC_J
508 #define OC_I(_k,_y) OC_MEM_OFFS((_k)*16+8,_y)
509 #define OC_J(_k,_y) OC_I(_k,_y)
510 OC_COLUMN_IDCT_10(y)
511 #undef OC_I
512 #undef OC_J
513 :[y]"=m"OC_ARRAY_OPERAND(ogg_int16_t,_y,64)
514 :[x]"m"OC_CONST_ARRAY_OPERAND(ogg_int16_t,_x,64),
515 [c]"m"OC_CONST_ARRAY_OPERAND(ogg_int16_t,OC_IDCT_CONSTS,128)
516 );
517 if(_x!=_y){
518 __asm__ __volatile__(
519 "pxor %%mm0,%%mm0\n\t"
520 "movq %%mm0,"OC_MEM_OFFS(0x00,x)"\n\t"
521 "movq %%mm0,"OC_MEM_OFFS(0x10,x)"\n\t"
522 "movq %%mm0,"OC_MEM_OFFS(0x20,x)"\n\t"
523 "movq %%mm0,"OC_MEM_OFFS(0x30,x)"\n\t"
524 :[x]"+m"OC_ARRAY_OPERAND(ogg_int16_t,_x,28)
525 );
526 }
527 }
528
529 /*Performs an inverse 8x8 Type-II DCT transform.
530 The input is assumed to be scaled by a factor of 4 relative to orthonormal
531 version of the transform.*/
532 void oc_idct8x8_mmx(ogg_int16_t _y[64],ogg_int16_t _x[64],int _last_zzi){
533 /*_last_zzi is subtly different from an actual count of the number of
534 coefficients we decoded for this block.
535 It contains the value of zzi BEFORE the final token in the block was
536 decoded.
537 In most cases this is an EOB token (the continuation of an EOB run from a
538 previous block counts), and so this is the same as the coefficient count.
539 However, in the case that the last token was NOT an EOB token, but filled
540 the block up with exactly 64 coefficients, _last_zzi will be less than 64.
541 Provided the last token was not a pure zero run, the minimum value it can
542 be is 46, and so that doesn't affect any of the cases in this routine.
543 However, if the last token WAS a pure zero run of length 63, then _last_zzi
544 will be 1 while the number of coefficients decoded is 64.
545 Thus, we will trigger the following special case, where the real
546 coefficient count would not.
547 Note also that a zero run of length 64 will give _last_zzi a value of 0,
548 but we still process the DC coefficient, which might have a non-zero value
549 due to DC prediction.
550 Although convoluted, this is arguably the correct behavior: it allows us to
551 use a smaller transform when the block ends with a long zero run instead
552 of a normal EOB token.
553 It could be smarter... multiple separate zero runs at the end of a block
554 will fool it, but an encoder that generates these really deserves what it
555 gets.
556 Needless to say we inherited this approach from VP3.*/
557 /*Then perform the iDCT.*/
558 if(_last_zzi<=10)oc_idct8x8_10_mmx(_y,_x);
559 else oc_idct8x8_slow_mmx(_y,_x);
560 }
561
562 #endif

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