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comparison: media/libtheora/lib/x86/sse2idct.c

media/libtheora/lib/x86/sse2idct.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 16503 2009-08-22 18:14:02Z giles $
15
16 ********************************************************************/
17
18 /*SSE2 acceleration of Theora's iDCT.*/
19 #include "x86int.h"
20 #include "sse2trans.h"
21 #include "../dct.h"
22
23 #if defined(OC_X86_ASM)
24
25 /*A table of constants used by the MMX routines.*/
26 const unsigned short __attribute__((aligned(16),used)) OC_IDCT_CONSTS[64]={
27 8, 8, 8, 8, 8, 8, 8, 8,
28 OC_C1S7,OC_C1S7,OC_C1S7,OC_C1S7,OC_C1S7,OC_C1S7,OC_C1S7,OC_C1S7,
29 OC_C2S6,OC_C2S6,OC_C2S6,OC_C2S6,OC_C2S6,OC_C2S6,OC_C2S6,OC_C2S6,
30 OC_C3S5,OC_C3S5,OC_C3S5,OC_C3S5,OC_C3S5,OC_C3S5,OC_C3S5,OC_C3S5,
31 OC_C4S4,OC_C4S4,OC_C4S4,OC_C4S4,OC_C4S4,OC_C4S4,OC_C4S4,OC_C4S4,
32 OC_C5S3,OC_C5S3,OC_C5S3,OC_C5S3,OC_C5S3,OC_C5S3,OC_C5S3,OC_C5S3,
33 OC_C6S2,OC_C6S2,OC_C6S2,OC_C6S2,OC_C6S2,OC_C6S2,OC_C6S2,OC_C6S2,
34 OC_C7S1,OC_C7S1,OC_C7S1,OC_C7S1,OC_C7S1,OC_C7S1,OC_C7S1,OC_C7S1
35 };
36
37
38 /*Performs the first three stages of the iDCT.
39 xmm2, xmm6, xmm3, and xmm5 must contain the corresponding rows of the input
40 (accessed in that order).
41 The remaining rows must be in _x at their corresponding locations.
42 On output, xmm7 down to xmm4 contain rows 0 through 3, and xmm0 up to xmm3
43 contain rows 4 through 7.*/
44 #define OC_IDCT_8x8_ABC(_x) \
45 "#OC_IDCT_8x8_ABC\n\t" \
46 /*Stage 1:*/ \
47 /*2-3 rotation by 6pi/16. \
48 xmm4=xmm7=C6, xmm0=xmm1=C2, xmm2=X2, xmm6=X6.*/ \
49 "movdqa "OC_MEM_OFFS(0x20,c)",%%xmm1\n\t" \
50 "movdqa "OC_MEM_OFFS(0x60,c)",%%xmm4\n\t" \
51 "movdqa %%xmm1,%%xmm0\n\t" \
52 "pmulhw %%xmm2,%%xmm1\n\t" \
53 "movdqa %%xmm4,%%xmm7\n\t" \
54 "pmulhw %%xmm6,%%xmm0\n\t" \
55 "pmulhw %%xmm2,%%xmm7\n\t" \
56 "pmulhw %%xmm6,%%xmm4\n\t" \
57 "paddw %%xmm6,%%xmm0\n\t" \
58 "movdqa "OC_MEM_OFFS(0x30,c)",%%xmm6\n\t" \
59 "paddw %%xmm1,%%xmm2\n\t" \
60 "psubw %%xmm0,%%xmm7\n\t" \
61 "movdqa %%xmm7,"OC_MEM_OFFS(0x00,buf)"\n\t" \
62 "paddw %%xmm4,%%xmm2\n\t" \
63 "movdqa "OC_MEM_OFFS(0x50,c)",%%xmm4\n\t" \
64 "movdqa %%xmm2,"OC_MEM_OFFS(0x10,buf)"\n\t" \
65 /*5-6 rotation by 3pi/16. \
66 xmm4=xmm2=C5, xmm1=xmm6=C3, xmm3=X3, xmm5=X5.*/ \
67 "movdqa %%xmm4,%%xmm2\n\t" \
68 "movdqa %%xmm6,%%xmm1\n\t" \
69 "pmulhw %%xmm3,%%xmm4\n\t" \
70 "pmulhw %%xmm5,%%xmm1\n\t" \
71 "pmulhw %%xmm3,%%xmm6\n\t" \
72 "pmulhw %%xmm5,%%xmm2\n\t" \
73 "paddw %%xmm3,%%xmm4\n\t" \
74 "paddw %%xmm5,%%xmm3\n\t" \
75 "paddw %%xmm6,%%xmm3\n\t" \
76 "movdqa "OC_MEM_OFFS(0x70,_x)",%%xmm6\n\t" \
77 "paddw %%xmm5,%%xmm1\n\t" \
78 "movdqa "OC_MEM_OFFS(0x10,_x)",%%xmm5\n\t" \
79 "paddw %%xmm3,%%xmm2\n\t" \
80 "movdqa "OC_MEM_OFFS(0x70,c)",%%xmm3\n\t" \
81 "psubw %%xmm4,%%xmm1\n\t" \
82 "movdqa "OC_MEM_OFFS(0x10,c)",%%xmm4\n\t" \
83 /*4-7 rotation by 7pi/16. \
84 xmm4=xmm7=C1, xmm3=xmm0=C7, xmm5=X1, xmm6=X7.*/ \
85 "movdqa %%xmm3,%%xmm0\n\t" \
86 "movdqa %%xmm4,%%xmm7\n\t" \
87 "pmulhw %%xmm5,%%xmm3\n\t" \
88 "pmulhw %%xmm5,%%xmm7\n\t" \
89 "pmulhw %%xmm6,%%xmm4\n\t" \
90 "pmulhw %%xmm6,%%xmm0\n\t" \
91 "paddw %%xmm6,%%xmm4\n\t" \
92 "movdqa "OC_MEM_OFFS(0x40,_x)",%%xmm6\n\t" \
93 "paddw %%xmm5,%%xmm7\n\t" \
94 "psubw %%xmm4,%%xmm3\n\t" \
95 "movdqa "OC_MEM_OFFS(0x40,c)",%%xmm4\n\t" \
96 "paddw %%xmm7,%%xmm0\n\t" \
97 "movdqa "OC_MEM_OFFS(0x00,_x)",%%xmm7\n\t" \
98 /*0-1 butterfly. \
99 xmm4=xmm5=C4, xmm7=X0, xmm6=X4.*/ \
100 "paddw %%xmm7,%%xmm6\n\t" \
101 "movdqa %%xmm4,%%xmm5\n\t" \
102 "pmulhw %%xmm6,%%xmm4\n\t" \
103 "paddw %%xmm7,%%xmm7\n\t" \
104 "psubw %%xmm6,%%xmm7\n\t" \
105 "paddw %%xmm6,%%xmm4\n\t" \
106 /*Stage 2:*/ \
107 /*4-5 butterfly: xmm3=t[4], xmm1=t[5] \
108 7-6 butterfly: xmm2=t[6], xmm0=t[7]*/ \
109 "movdqa %%xmm3,%%xmm6\n\t" \
110 "paddw %%xmm1,%%xmm3\n\t" \
111 "psubw %%xmm1,%%xmm6\n\t" \
112 "movdqa %%xmm5,%%xmm1\n\t" \
113 "pmulhw %%xmm7,%%xmm5\n\t" \
114 "paddw %%xmm7,%%xmm5\n\t" \
115 "movdqa %%xmm0,%%xmm7\n\t" \
116 "paddw %%xmm2,%%xmm0\n\t" \
117 "psubw %%xmm2,%%xmm7\n\t" \
118 "movdqa %%xmm1,%%xmm2\n\t" \
119 "pmulhw %%xmm6,%%xmm1\n\t" \
120 "pmulhw %%xmm7,%%xmm2\n\t" \
121 "paddw %%xmm6,%%xmm1\n\t" \
122 "movdqa "OC_MEM_OFFS(0x00,buf)",%%xmm6\n\t" \
123 "paddw %%xmm7,%%xmm2\n\t" \
124 "movdqa "OC_MEM_OFFS(0x10,buf)",%%xmm7\n\t" \
125 /*Stage 3: \
126 6-5 butterfly: xmm1=t[5], xmm2=t[6] -> xmm1=t[6]+t[5], xmm2=t[6]-t[5] \
127 0-3 butterfly: xmm4=t[0], xmm7=t[3] -> xmm7=t[0]+t[3], xmm4=t[0]-t[3] \
128 1-2 butterfly: xmm5=t[1], xmm6=t[2] -> xmm6=t[1]+t[2], xmm5=t[1]-t[2]*/ \
129 "paddw %%xmm2,%%xmm1\n\t" \
130 "paddw %%xmm5,%%xmm6\n\t" \
131 "paddw %%xmm4,%%xmm7\n\t" \
132 "paddw %%xmm2,%%xmm2\n\t" \
133 "paddw %%xmm4,%%xmm4\n\t" \
134 "paddw %%xmm5,%%xmm5\n\t" \
135 "psubw %%xmm1,%%xmm2\n\t" \
136 "psubw %%xmm7,%%xmm4\n\t" \
137 "psubw %%xmm6,%%xmm5\n\t" \
138
139 /*Performs the last stage of the iDCT.
140 On input, xmm7 down to xmm4 contain rows 0 through 3, and xmm0 up to xmm3
141 contain rows 4 through 7.
142 On output, xmm0 through xmm7 contain the corresponding rows.*/
143 #define OC_IDCT_8x8_D \
144 "#OC_IDCT_8x8_D\n\t" \
145 /*Stage 4: \
146 0-7 butterfly: xmm7=t[0], xmm0=t[7] -> xmm0=t[0]+t[7], xmm7=t[0]-t[7] \
147 1-6 butterfly: xmm6=t[1], xmm1=t[6] -> xmm1=t[1]+t[6], xmm6=t[1]-t[6] \
148 2-5 butterfly: xmm5=t[2], xmm2=t[5] -> xmm2=t[2]+t[5], xmm5=t[2]-t[5] \
149 3-4 butterfly: xmm4=t[3], xmm3=t[4] -> xmm3=t[3]+t[4], xmm4=t[3]-t[4]*/ \
150 "psubw %%xmm0,%%xmm7\n\t" \
151 "psubw %%xmm1,%%xmm6\n\t" \
152 "psubw %%xmm2,%%xmm5\n\t" \
153 "psubw %%xmm3,%%xmm4\n\t" \
154 "paddw %%xmm0,%%xmm0\n\t" \
155 "paddw %%xmm1,%%xmm1\n\t" \
156 "paddw %%xmm2,%%xmm2\n\t" \
157 "paddw %%xmm3,%%xmm3\n\t" \
158 "paddw %%xmm7,%%xmm0\n\t" \
159 "paddw %%xmm6,%%xmm1\n\t" \
160 "paddw %%xmm5,%%xmm2\n\t" \
161 "paddw %%xmm4,%%xmm3\n\t" \
162
163 /*Performs the last stage of the iDCT.
164 On input, xmm7 down to xmm4 contain rows 0 through 3, and xmm0 up to xmm3
165 contain rows 4 through 7.
166 On output, xmm0 through xmm7 contain the corresponding rows.*/
167 #define OC_IDCT_8x8_D_STORE \
168 "#OC_IDCT_8x8_D_STORE\n\t" \
169 /*Stage 4: \
170 0-7 butterfly: xmm7=t[0], xmm0=t[7] -> xmm0=t[0]+t[7], xmm7=t[0]-t[7] \
171 1-6 butterfly: xmm6=t[1], xmm1=t[6] -> xmm1=t[1]+t[6], xmm6=t[1]-t[6] \
172 2-5 butterfly: xmm5=t[2], xmm2=t[5] -> xmm2=t[2]+t[5], xmm5=t[2]-t[5] \
173 3-4 butterfly: xmm4=t[3], xmm3=t[4] -> xmm3=t[3]+t[4], xmm4=t[3]-t[4]*/ \
174 "psubw %%xmm3,%%xmm4\n\t" \
175 "movdqa %%xmm4,"OC_MEM_OFFS(0x40,y)"\n\t" \
176 "movdqa "OC_MEM_OFFS(0x00,c)",%%xmm4\n\t" \
177 "psubw %%xmm0,%%xmm7\n\t" \
178 "psubw %%xmm1,%%xmm6\n\t" \
179 "psubw %%xmm2,%%xmm5\n\t" \
180 "paddw %%xmm4,%%xmm7\n\t" \
181 "paddw %%xmm4,%%xmm6\n\t" \
182 "paddw %%xmm4,%%xmm5\n\t" \
183 "paddw "OC_MEM_OFFS(0x40,y)",%%xmm4\n\t" \
184 "paddw %%xmm0,%%xmm0\n\t" \
185 "paddw %%xmm1,%%xmm1\n\t" \
186 "paddw %%xmm2,%%xmm2\n\t" \
187 "paddw %%xmm3,%%xmm3\n\t" \
188 "paddw %%xmm7,%%xmm0\n\t" \
189 "paddw %%xmm6,%%xmm1\n\t" \
190 "psraw $4,%%xmm0\n\t" \
191 "paddw %%xmm5,%%xmm2\n\t" \
192 "movdqa %%xmm0,"OC_MEM_OFFS(0x00,y)"\n\t" \
193 "psraw $4,%%xmm1\n\t" \
194 "paddw %%xmm4,%%xmm3\n\t" \
195 "movdqa %%xmm1,"OC_MEM_OFFS(0x10,y)"\n\t" \
196 "psraw $4,%%xmm2\n\t" \
197 "movdqa %%xmm2,"OC_MEM_OFFS(0x20,y)"\n\t" \
198 "psraw $4,%%xmm3\n\t" \
199 "movdqa %%xmm3,"OC_MEM_OFFS(0x30,y)"\n\t" \
200 "psraw $4,%%xmm4\n\t" \
201 "movdqa %%xmm4,"OC_MEM_OFFS(0x40,y)"\n\t" \
202 "psraw $4,%%xmm5\n\t" \
203 "movdqa %%xmm5,"OC_MEM_OFFS(0x50,y)"\n\t" \
204 "psraw $4,%%xmm6\n\t" \
205 "movdqa %%xmm6,"OC_MEM_OFFS(0x60,y)"\n\t" \
206 "psraw $4,%%xmm7\n\t" \
207 "movdqa %%xmm7,"OC_MEM_OFFS(0x70,y)"\n\t" \
208
209 static void oc_idct8x8_slow_sse2(ogg_int16_t _y[64],ogg_int16_t _x[64]){
210 OC_ALIGN16(ogg_int16_t buf[16]);
211 /*This routine accepts an 8x8 matrix pre-transposed.*/
212 __asm__ __volatile__(
213 /*Load rows 2, 3, 5, and 6 for the first stage of the iDCT.*/
214 "movdqa "OC_MEM_OFFS(0x20,x)",%%xmm2\n\t"
215 "movdqa "OC_MEM_OFFS(0x60,x)",%%xmm6\n\t"
216 "movdqa "OC_MEM_OFFS(0x30,x)",%%xmm3\n\t"
217 "movdqa "OC_MEM_OFFS(0x50,x)",%%xmm5\n\t"
218 OC_IDCT_8x8_ABC(x)
219 OC_IDCT_8x8_D
220 OC_TRANSPOSE_8x8
221 /*Clear out rows 0, 1, 4, and 7 for the first stage of the iDCT.*/
222 "movdqa %%xmm7,"OC_MEM_OFFS(0x70,y)"\n\t"
223 "movdqa %%xmm4,"OC_MEM_OFFS(0x40,y)"\n\t"
224 "movdqa %%xmm1,"OC_MEM_OFFS(0x10,y)"\n\t"
225 "movdqa %%xmm0,"OC_MEM_OFFS(0x00,y)"\n\t"
226 OC_IDCT_8x8_ABC(y)
227 OC_IDCT_8x8_D_STORE
228 :[buf]"=m"(OC_ARRAY_OPERAND(ogg_int16_t,buf,16)),
229 [y]"=m"(OC_ARRAY_OPERAND(ogg_int16_t,_y,64))
230 :[x]"m"(OC_CONST_ARRAY_OPERAND(ogg_int16_t,_x,64)),
231 [c]"m"(OC_CONST_ARRAY_OPERAND(ogg_int16_t,OC_IDCT_CONSTS,128))
232 );
233 if(_x!=_y){
234 int i;
235 __asm__ __volatile__("pxor %%xmm0,%%xmm0\n\t"::);
236 /*Clear input data for next block (decoder only).*/
237 for(i=0;i<2;i++){
238 __asm__ __volatile__(
239 "movdqa %%xmm0,"OC_MEM_OFFS(0x00,x)"\n\t"
240 "movdqa %%xmm0,"OC_MEM_OFFS(0x10,x)"\n\t"
241 "movdqa %%xmm0,"OC_MEM_OFFS(0x20,x)"\n\t"
242 "movdqa %%xmm0,"OC_MEM_OFFS(0x30,x)"\n\t"
243 :[x]"=m"(OC_ARRAY_OPERAND(ogg_int16_t,_x+i*32,32))
244 );
245 }
246 }
247 }
248
249 /*For the first step of the 10-coefficient version of the 8x8 iDCT, we only
250 need to work with four columns at a time.
251 Doing this in MMX is faster on processors with a 64-bit data path.*/
252 #define OC_IDCT_8x8_10_MMX \
253 "#OC_IDCT_8x8_10_MMX\n\t" \
254 /*Stage 1:*/ \
255 /*2-3 rotation by 6pi/16. \
256 mm7=C6, mm6=C2, mm2=X2, X6=0.*/ \
257 "movq "OC_MEM_OFFS(0x60,c)",%%mm7\n\t" \
258 "movq "OC_MEM_OFFS(0x20,c)",%%mm6\n\t" \
259 "pmulhw %%mm2,%%mm6\n\t" \
260 "pmulhw %%mm2,%%mm7\n\t" \
261 "movq "OC_MEM_OFFS(0x50,c)",%%mm5\n\t" \
262 "paddw %%mm6,%%mm2\n\t" \
263 "movq %%mm2,"OC_MEM_OFFS(0x10,buf)"\n\t" \
264 "movq "OC_MEM_OFFS(0x30,c)",%%mm2\n\t" \
265 "movq %%mm7,"OC_MEM_OFFS(0x00,buf)"\n\t" \
266 /*5-6 rotation by 3pi/16. \
267 mm5=C5, mm2=C3, mm3=X3, X5=0.*/ \
268 "pmulhw %%mm3,%%mm5\n\t" \
269 "pmulhw %%mm3,%%mm2\n\t" \
270 "movq "OC_MEM_OFFS(0x10,c)",%%mm7\n\t" \
271 "paddw %%mm3,%%mm5\n\t" \
272 "paddw %%mm3,%%mm2\n\t" \
273 "movq "OC_MEM_OFFS(0x70,c)",%%mm3\n\t" \
274 /*4-7 rotation by 7pi/16. \
275 mm7=C1, mm3=C7, mm1=X1, X7=0.*/ \
276 "pmulhw %%mm1,%%mm3\n\t" \
277 "pmulhw %%mm1,%%mm7\n\t" \
278 "movq "OC_MEM_OFFS(0x40,c)",%%mm4\n\t" \
279 "movq %%mm3,%%mm6\n\t" \
280 "paddw %%mm1,%%mm7\n\t" \
281 /*0-1 butterfly. \
282 mm4=C4, mm0=X0, X4=0.*/ \
283 /*Stage 2:*/ \
284 /*4-5 butterfly: mm3=t[4], mm5=t[5] \
285 7-6 butterfly: mm2=t[6], mm7=t[7]*/ \
286 "psubw %%mm5,%%mm3\n\t" \
287 "paddw %%mm5,%%mm6\n\t" \
288 "movq %%mm4,%%mm1\n\t" \
289 "pmulhw %%mm0,%%mm4\n\t" \
290 "paddw %%mm0,%%mm4\n\t" \
291 "movq %%mm7,%%mm0\n\t" \
292 "movq %%mm4,%%mm5\n\t" \
293 "paddw %%mm2,%%mm0\n\t" \
294 "psubw %%mm2,%%mm7\n\t" \
295 "movq %%mm1,%%mm2\n\t" \
296 "pmulhw %%mm6,%%mm1\n\t" \
297 "pmulhw %%mm7,%%mm2\n\t" \
298 "paddw %%mm6,%%mm1\n\t" \
299 "movq "OC_MEM_OFFS(0x00,buf)",%%mm6\n\t" \
300 "paddw %%mm7,%%mm2\n\t" \
301 "movq "OC_MEM_OFFS(0x10,buf)",%%mm7\n\t" \
302 /*Stage 3: \
303 6-5 butterfly: mm1=t[5], mm2=t[6] -> mm1=t[6]+t[5], mm2=t[6]-t[5] \
304 0-3 butterfly: mm4=t[0], mm7=t[3] -> mm7=t[0]+t[3], mm4=t[0]-t[3] \
305 1-2 butterfly: mm5=t[1], mm6=t[2] -> mm6=t[1]+t[2], mm5=t[1]-t[2]*/ \
306 "paddw %%mm2,%%mm1\n\t" \
307 "paddw %%mm5,%%mm6\n\t" \
308 "paddw %%mm4,%%mm7\n\t" \
309 "paddw %%mm2,%%mm2\n\t" \
310 "paddw %%mm4,%%mm4\n\t" \
311 "paddw %%mm5,%%mm5\n\t" \
312 "psubw %%mm1,%%mm2\n\t" \
313 "psubw %%mm7,%%mm4\n\t" \
314 "psubw %%mm6,%%mm5\n\t" \
315 /*Stage 4: \
316 0-7 butterfly: mm7=t[0], mm0=t[7] -> mm0=t[0]+t[7], mm7=t[0]-t[7] \
317 1-6 butterfly: mm6=t[1], mm1=t[6] -> mm1=t[1]+t[6], mm6=t[1]-t[6] \
318 2-5 butterfly: mm5=t[2], mm2=t[5] -> mm2=t[2]+t[5], mm5=t[2]-t[5] \
319 3-4 butterfly: mm4=t[3], mm3=t[4] -> mm3=t[3]+t[4], mm4=t[3]-t[4]*/ \
320 "psubw %%mm0,%%mm7\n\t" \
321 "psubw %%mm1,%%mm6\n\t" \
322 "psubw %%mm2,%%mm5\n\t" \
323 "psubw %%mm3,%%mm4\n\t" \
324 "paddw %%mm0,%%mm0\n\t" \
325 "paddw %%mm1,%%mm1\n\t" \
326 "paddw %%mm2,%%mm2\n\t" \
327 "paddw %%mm3,%%mm3\n\t" \
328 "paddw %%mm7,%%mm0\n\t" \
329 "paddw %%mm6,%%mm1\n\t" \
330 "paddw %%mm5,%%mm2\n\t" \
331 "paddw %%mm4,%%mm3\n\t" \
332
333 #define OC_IDCT_8x8_10_ABC \
334 "#OC_IDCT_8x8_10_ABC\n\t" \
335 /*Stage 1:*/ \
336 /*2-3 rotation by 6pi/16. \
337 xmm7=C6, xmm6=C2, xmm2=X2, X6=0.*/ \
338 "movdqa "OC_MEM_OFFS(0x60,c)",%%xmm7\n\t" \
339 "movdqa "OC_MEM_OFFS(0x20,c)",%%xmm6\n\t" \
340 "pmulhw %%xmm2,%%xmm6\n\t" \
341 "pmulhw %%xmm2,%%xmm7\n\t" \
342 "movdqa "OC_MEM_OFFS(0x50,c)",%%xmm5\n\t" \
343 "paddw %%xmm6,%%xmm2\n\t" \
344 "movdqa %%xmm2,"OC_MEM_OFFS(0x10,buf)"\n\t" \
345 "movdqa "OC_MEM_OFFS(0x30,c)",%%xmm2\n\t" \
346 "movdqa %%xmm7,"OC_MEM_OFFS(0x00,buf)"\n\t" \
347 /*5-6 rotation by 3pi/16. \
348 xmm5=C5, xmm2=C3, xmm3=X3, X5=0.*/ \
349 "pmulhw %%xmm3,%%xmm5\n\t" \
350 "pmulhw %%xmm3,%%xmm2\n\t" \
351 "movdqa "OC_MEM_OFFS(0x10,c)",%%xmm7\n\t" \
352 "paddw %%xmm3,%%xmm5\n\t" \
353 "paddw %%xmm3,%%xmm2\n\t" \
354 "movdqa "OC_MEM_OFFS(0x70,c)",%%xmm3\n\t" \
355 /*4-7 rotation by 7pi/16. \
356 xmm7=C1, xmm3=C7, xmm1=X1, X7=0.*/ \
357 "pmulhw %%xmm1,%%xmm3\n\t" \
358 "pmulhw %%xmm1,%%xmm7\n\t" \
359 "movdqa "OC_MEM_OFFS(0x40,c)",%%xmm4\n\t" \
360 "movdqa %%xmm3,%%xmm6\n\t" \
361 "paddw %%xmm1,%%xmm7\n\t" \
362 /*0-1 butterfly. \
363 xmm4=C4, xmm0=X0, X4=0.*/ \
364 /*Stage 2:*/ \
365 /*4-5 butterfly: xmm3=t[4], xmm5=t[5] \
366 7-6 butterfly: xmm2=t[6], xmm7=t[7]*/ \
367 "psubw %%xmm5,%%xmm3\n\t" \
368 "paddw %%xmm5,%%xmm6\n\t" \
369 "movdqa %%xmm4,%%xmm1\n\t" \
370 "pmulhw %%xmm0,%%xmm4\n\t" \
371 "paddw %%xmm0,%%xmm4\n\t" \
372 "movdqa %%xmm7,%%xmm0\n\t" \
373 "movdqa %%xmm4,%%xmm5\n\t" \
374 "paddw %%xmm2,%%xmm0\n\t" \
375 "psubw %%xmm2,%%xmm7\n\t" \
376 "movdqa %%xmm1,%%xmm2\n\t" \
377 "pmulhw %%xmm6,%%xmm1\n\t" \
378 "pmulhw %%xmm7,%%xmm2\n\t" \
379 "paddw %%xmm6,%%xmm1\n\t" \
380 "movdqa "OC_MEM_OFFS(0x00,buf)",%%xmm6\n\t" \
381 "paddw %%xmm7,%%xmm2\n\t" \
382 "movdqa "OC_MEM_OFFS(0x10,buf)",%%xmm7\n\t" \
383 /*Stage 3: \
384 6-5 butterfly: xmm1=t[5], xmm2=t[6] -> xmm1=t[6]+t[5], xmm2=t[6]-t[5] \
385 0-3 butterfly: xmm4=t[0], xmm7=t[3] -> xmm7=t[0]+t[3], xmm4=t[0]-t[3] \
386 1-2 butterfly: xmm5=t[1], xmm6=t[2] -> xmm6=t[1]+t[2], xmm5=t[1]-t[2]*/ \
387 "paddw %%xmm2,%%xmm1\n\t" \
388 "paddw %%xmm5,%%xmm6\n\t" \
389 "paddw %%xmm4,%%xmm7\n\t" \
390 "paddw %%xmm2,%%xmm2\n\t" \
391 "paddw %%xmm4,%%xmm4\n\t" \
392 "paddw %%xmm5,%%xmm5\n\t" \
393 "psubw %%xmm1,%%xmm2\n\t" \
394 "psubw %%xmm7,%%xmm4\n\t" \
395 "psubw %%xmm6,%%xmm5\n\t" \
396
397 static void oc_idct8x8_10_sse2(ogg_int16_t _y[64],ogg_int16_t _x[64]){
398 OC_ALIGN16(ogg_int16_t buf[16]);
399 /*This routine accepts an 8x8 matrix pre-transposed.*/
400 __asm__ __volatile__(
401 "movq "OC_MEM_OFFS(0x20,x)",%%mm2\n\t"
402 "movq "OC_MEM_OFFS(0x30,x)",%%mm3\n\t"
403 "movq "OC_MEM_OFFS(0x10,x)",%%mm1\n\t"
404 "movq "OC_MEM_OFFS(0x00,x)",%%mm0\n\t"
405 OC_IDCT_8x8_10_MMX
406 OC_TRANSPOSE_8x4_MMX2SSE
407 OC_IDCT_8x8_10_ABC
408 OC_IDCT_8x8_D_STORE
409 :[buf]"=m"(OC_ARRAY_OPERAND(short,buf,16)),
410 [y]"=m"(OC_ARRAY_OPERAND(ogg_int16_t,_y,64))
411 :[x]"m"OC_CONST_ARRAY_OPERAND(ogg_int16_t,_x,64),
412 [c]"m"(OC_CONST_ARRAY_OPERAND(ogg_int16_t,OC_IDCT_CONSTS,128))
413 );
414 if(_x!=_y){
415 /*Clear input data for next block (decoder only).*/
416 __asm__ __volatile__(
417 "pxor %%mm0,%%mm0\n\t"
418 "movq %%mm0,"OC_MEM_OFFS(0x00,x)"\n\t"
419 "movq %%mm0,"OC_MEM_OFFS(0x10,x)"\n\t"
420 "movq %%mm0,"OC_MEM_OFFS(0x20,x)"\n\t"
421 "movq %%mm0,"OC_MEM_OFFS(0x30,x)"\n\t"
422 :[x]"+m"(OC_ARRAY_OPERAND(ogg_int16_t,_x,28))
423 );
424 }
425 }
426
427 /*Performs an inverse 8x8 Type-II DCT transform.
428 The input is assumed to be scaled by a factor of 4 relative to orthonormal
429 version of the transform.*/
430 void oc_idct8x8_sse2(ogg_int16_t _y[64],ogg_int16_t _x[64],int _last_zzi){
431 /*_last_zzi is subtly different from an actual count of the number of
432 coefficients we decoded for this block.
433 It contains the value of zzi BEFORE the final token in the block was
434 decoded.
435 In most cases this is an EOB token (the continuation of an EOB run from a
436 previous block counts), and so this is the same as the coefficient count.
437 However, in the case that the last token was NOT an EOB token, but filled
438 the block up with exactly 64 coefficients, _last_zzi will be less than 64.
439 Provided the last token was not a pure zero run, the minimum value it can
440 be is 46, and so that doesn't affect any of the cases in this routine.
441 However, if the last token WAS a pure zero run of length 63, then _last_zzi
442 will be 1 while the number of coefficients decoded is 64.
443 Thus, we will trigger the following special case, where the real
444 coefficient count would not.
445 Note also that a zero run of length 64 will give _last_zzi a value of 0,
446 but we still process the DC coefficient, which might have a non-zero value
447 due to DC prediction.
448 Although convoluted, this is arguably the correct behavior: it allows us to
449 use a smaller transform when the block ends with a long zero run instead
450 of a normal EOB token.
451 It could be smarter... multiple separate zero runs at the end of a block
452 will fool it, but an encoder that generates these really deserves what it
453 gets.
454 Needless to say we inherited this approach from VP3.*/
455 /*Then perform the iDCT.*/
456 if(_last_zzi<=10)oc_idct8x8_10_sse2(_y,_x);
457 else oc_idct8x8_slow_sse2(_y,_x);
458 }
459
460 #endif

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