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idct_sse2_xvid.c
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1 /*
2  * XVID MPEG-4 VIDEO CODEC
3  * - SSE2 inverse discrete cosine transform -
4  *
5  * Copyright(C) 2003 Pascal Massimino <skal@planet-d.net>
6  *
7  * Conversion to gcc syntax with modifications
8  * by Alexander Strange <astrange@ithinksw.com>
9  *
10  * Originally from dct/x86_asm/fdct_sse2_skal.asm in Xvid.
11  *
12  * This file is part of FFmpeg.
13  *
14  * Vertical pass is an implementation of the scheme:
15  * Loeffler C., Ligtenberg A., and Moschytz C.S.:
16  * Practical Fast 1D DCT Algorithm with Eleven Multiplications,
17  * Proc. ICASSP 1989, 988-991.
18  *
19  * Horizontal pass is a double 4x4 vector/matrix multiplication,
20  * (see also Intel's Application Note 922:
21  * http://developer.intel.com/vtune/cbts/strmsimd/922down.htm
22  * Copyright (C) 1999 Intel Corporation)
23  *
24  * More details at http://skal.planet-d.net/coding/dct.html
25  *
26  * FFmpeg is free software; you can redistribute it and/or
27  * modify it under the terms of the GNU Lesser General Public
28  * License as published by the Free Software Foundation; either
29  * version 2.1 of the License, or (at your option) any later version.
30  *
31  * FFmpeg is distributed in the hope that it will be useful,
32  * but WITHOUT ANY WARRANTY; without even the implied warranty of
33  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
34  * Lesser General Public License for more details.
35  *
36  * You should have received a copy of the GNU Lesser General Public License
37  * along with FFmpeg; if not, write to the Free Software Foundation,
38  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
39  */
40 
41 #include "libavutil/mem.h"
42 #include "libavutil/x86/asm.h"
43 #include "idct_xvid.h"
44 #include "dsputil_x86.h"
45 
46 #if HAVE_SSE2_INLINE
47 
48 /**
49  * @file
50  * @brief SSE2 idct compatible with xvidmmx
51  */
52 
53 #define X8(x) x,x,x,x,x,x,x,x
54 
55 #define ROW_SHIFT 11
56 #define COL_SHIFT 6
57 
58 DECLARE_ASM_CONST(16, int16_t, tan1)[] = {X8(13036)}; // tan( pi/16)
59 DECLARE_ASM_CONST(16, int16_t, tan2)[] = {X8(27146)}; // tan(2pi/16) = sqrt(2)-1
60 DECLARE_ASM_CONST(16, int16_t, tan3)[] = {X8(43790)}; // tan(3pi/16)-1
61 DECLARE_ASM_CONST(16, int16_t, sqrt2)[]= {X8(23170)}; // 0.5/sqrt(2)
62 DECLARE_ASM_CONST(8, uint8_t, m127)[] = {X8(127)};
63 
64 DECLARE_ASM_CONST(16, int16_t, iTab1)[] = {
65  0x4000, 0x539f, 0xc000, 0xac61, 0x4000, 0xdd5d, 0x4000, 0xdd5d,
66  0x4000, 0x22a3, 0x4000, 0x22a3, 0xc000, 0x539f, 0x4000, 0xac61,
67  0x3249, 0x11a8, 0x4b42, 0xee58, 0x11a8, 0x4b42, 0x11a8, 0xcdb7,
68  0x58c5, 0x4b42, 0xa73b, 0xcdb7, 0x3249, 0xa73b, 0x4b42, 0xa73b
69 };
70 
71 DECLARE_ASM_CONST(16, int16_t, iTab2)[] = {
72  0x58c5, 0x73fc, 0xa73b, 0x8c04, 0x58c5, 0xcff5, 0x58c5, 0xcff5,
73  0x58c5, 0x300b, 0x58c5, 0x300b, 0xa73b, 0x73fc, 0x58c5, 0x8c04,
74  0x45bf, 0x187e, 0x6862, 0xe782, 0x187e, 0x6862, 0x187e, 0xba41,
75  0x7b21, 0x6862, 0x84df, 0xba41, 0x45bf, 0x84df, 0x6862, 0x84df
76 };
77 
78 DECLARE_ASM_CONST(16, int16_t, iTab3)[] = {
79  0x539f, 0x6d41, 0xac61, 0x92bf, 0x539f, 0xd2bf, 0x539f, 0xd2bf,
80  0x539f, 0x2d41, 0x539f, 0x2d41, 0xac61, 0x6d41, 0x539f, 0x92bf,
81  0x41b3, 0x1712, 0x6254, 0xe8ee, 0x1712, 0x6254, 0x1712, 0xbe4d,
82  0x73fc, 0x6254, 0x8c04, 0xbe4d, 0x41b3, 0x8c04, 0x6254, 0x8c04
83 };
84 
85 DECLARE_ASM_CONST(16, int16_t, iTab4)[] = {
86  0x4b42, 0x6254, 0xb4be, 0x9dac, 0x4b42, 0xd746, 0x4b42, 0xd746,
87  0x4b42, 0x28ba, 0x4b42, 0x28ba, 0xb4be, 0x6254, 0x4b42, 0x9dac,
88  0x3b21, 0x14c3, 0x587e, 0xeb3d, 0x14c3, 0x587e, 0x14c3, 0xc4df,
89  0x6862, 0x587e, 0x979e, 0xc4df, 0x3b21, 0x979e, 0x587e, 0x979e
90 };
91 
92 DECLARE_ASM_CONST(16, int32_t, walkenIdctRounders)[] = {
93  65536, 65536, 65536, 65536,
94  3597, 3597, 3597, 3597,
95  2260, 2260, 2260, 2260,
96  1203, 1203, 1203, 1203,
97  120, 120, 120, 120,
98  512, 512, 512, 512
99 };
100 
101 // Temporary storage before the column pass
102 #define ROW1 "%%xmm6"
103 #define ROW3 "%%xmm4"
104 #define ROW5 "%%xmm5"
105 #define ROW7 "%%xmm7"
106 
107 #define CLEAR_ODD(r) "pxor "r","r" \n\t"
108 #define PUT_ODD(dst) "pshufhw $0x1B, %%xmm2, "dst" \n\t"
109 
110 #if ARCH_X86_64
111 
112 # define ROW0 "%%xmm8"
113 # define REG0 ROW0
114 # define ROW2 "%%xmm9"
115 # define REG2 ROW2
116 # define ROW4 "%%xmm10"
117 # define REG4 ROW4
118 # define ROW6 "%%xmm11"
119 # define REG6 ROW6
120 # define CLEAR_EVEN(r) CLEAR_ODD(r)
121 # define PUT_EVEN(dst) PUT_ODD(dst)
122 # define XMMS "%%xmm12"
123 # define MOV_32_ONLY "#"
124 # define SREG2 REG2
125 # define TAN3 "%%xmm13"
126 # define TAN1 "%%xmm14"
127 
128 #else
129 
130 # define ROW0 "(%0)"
131 # define REG0 "%%xmm4"
132 # define ROW2 "2*16(%0)"
133 # define REG2 "%%xmm4"
134 # define ROW4 "4*16(%0)"
135 # define REG4 "%%xmm6"
136 # define ROW6 "6*16(%0)"
137 # define REG6 "%%xmm6"
138 # define CLEAR_EVEN(r)
139 # define PUT_EVEN(dst) \
140  "pshufhw $0x1B, %%xmm2, %%xmm2 \n\t" \
141  "movdqa %%xmm2, "dst" \n\t"
142 # define XMMS "%%xmm2"
143 # define MOV_32_ONLY "movdqa "
144 # define SREG2 "%%xmm7"
145 # define TAN3 "%%xmm0"
146 # define TAN1 "%%xmm2"
147 
148 #endif
149 
150 #define ROUND(x) "paddd "MANGLE(x)
151 
152 #define JZ(reg, to) \
153  "testl "reg","reg" \n\t" \
154  "jz "to" \n\t"
155 
156 #define JNZ(reg, to) \
157  "testl "reg","reg" \n\t" \
158  "jnz "to" \n\t"
159 
160 #define TEST_ONE_ROW(src, reg, clear) \
161  clear \
162  "movq "src", %%mm1 \n\t" \
163  "por 8+"src", %%mm1 \n\t" \
164  "paddusb %%mm0, %%mm1 \n\t" \
165  "pmovmskb %%mm1, "reg" \n\t"
166 
167 #define TEST_TWO_ROWS(row1, row2, reg1, reg2, clear1, clear2) \
168  clear1 \
169  clear2 \
170  "movq "row1", %%mm1 \n\t" \
171  "por 8+"row1", %%mm1 \n\t" \
172  "movq "row2", %%mm2 \n\t" \
173  "por 8+"row2", %%mm2 \n\t" \
174  "paddusb %%mm0, %%mm1 \n\t" \
175  "paddusb %%mm0, %%mm2 \n\t" \
176  "pmovmskb %%mm1, "reg1" \n\t" \
177  "pmovmskb %%mm2, "reg2" \n\t"
178 
179 ///IDCT pass on rows.
180 #define iMTX_MULT(src, table, rounder, put) \
181  "movdqa "src", %%xmm3 \n\t" \
182  "movdqa %%xmm3, %%xmm0 \n\t" \
183  "pshufd $0x11, %%xmm3, %%xmm1 \n\t" /* 4602 */ \
184  "punpcklqdq %%xmm0, %%xmm0 \n\t" /* 0246 */ \
185  "pmaddwd "table", %%xmm0 \n\t" \
186  "pmaddwd 16+"table", %%xmm1 \n\t" \
187  "pshufd $0xBB, %%xmm3, %%xmm2 \n\t" /* 5713 */ \
188  "punpckhqdq %%xmm3, %%xmm3 \n\t" /* 1357 */ \
189  "pmaddwd 32+"table", %%xmm2 \n\t" \
190  "pmaddwd 48+"table", %%xmm3 \n\t" \
191  "paddd %%xmm1, %%xmm0 \n\t" \
192  "paddd %%xmm3, %%xmm2 \n\t" \
193  rounder", %%xmm0 \n\t" \
194  "movdqa %%xmm2, %%xmm3 \n\t" \
195  "paddd %%xmm0, %%xmm2 \n\t" \
196  "psubd %%xmm3, %%xmm0 \n\t" \
197  "psrad $11, %%xmm2 \n\t" \
198  "psrad $11, %%xmm0 \n\t" \
199  "packssdw %%xmm0, %%xmm2 \n\t" \
200  put \
201  "1: \n\t"
202 
203 #define iLLM_HEAD \
204  "movdqa "MANGLE(tan3)", "TAN3" \n\t" \
205  "movdqa "MANGLE(tan1)", "TAN1" \n\t" \
206 
207 ///IDCT pass on columns.
208 #define iLLM_PASS(dct) \
209  "movdqa "TAN3", %%xmm1 \n\t" \
210  "movdqa "TAN1", %%xmm3 \n\t" \
211  "pmulhw %%xmm4, "TAN3" \n\t" \
212  "pmulhw %%xmm5, %%xmm1 \n\t" \
213  "paddsw %%xmm4, "TAN3" \n\t" \
214  "paddsw %%xmm5, %%xmm1 \n\t" \
215  "psubsw %%xmm5, "TAN3" \n\t" \
216  "paddsw %%xmm4, %%xmm1 \n\t" \
217  "pmulhw %%xmm7, %%xmm3 \n\t" \
218  "pmulhw %%xmm6, "TAN1" \n\t" \
219  "paddsw %%xmm6, %%xmm3 \n\t" \
220  "psubsw %%xmm7, "TAN1" \n\t" \
221  "movdqa %%xmm3, %%xmm7 \n\t" \
222  "movdqa "TAN1", %%xmm6 \n\t" \
223  "psubsw %%xmm1, %%xmm3 \n\t" \
224  "psubsw "TAN3", "TAN1" \n\t" \
225  "paddsw %%xmm7, %%xmm1 \n\t" \
226  "paddsw %%xmm6, "TAN3" \n\t" \
227  "movdqa %%xmm3, %%xmm6 \n\t" \
228  "psubsw "TAN3", %%xmm3 \n\t" \
229  "paddsw %%xmm6, "TAN3" \n\t" \
230  "movdqa "MANGLE(sqrt2)", %%xmm4 \n\t" \
231  "pmulhw %%xmm4, %%xmm3 \n\t" \
232  "pmulhw %%xmm4, "TAN3" \n\t" \
233  "paddsw "TAN3", "TAN3" \n\t" \
234  "paddsw %%xmm3, %%xmm3 \n\t" \
235  "movdqa "MANGLE(tan2)", %%xmm7 \n\t" \
236  MOV_32_ONLY ROW2", "REG2" \n\t" \
237  MOV_32_ONLY ROW6", "REG6" \n\t" \
238  "movdqa %%xmm7, %%xmm5 \n\t" \
239  "pmulhw "REG6", %%xmm7 \n\t" \
240  "pmulhw "REG2", %%xmm5 \n\t" \
241  "paddsw "REG2", %%xmm7 \n\t" \
242  "psubsw "REG6", %%xmm5 \n\t" \
243  MOV_32_ONLY ROW0", "REG0" \n\t" \
244  MOV_32_ONLY ROW4", "REG4" \n\t" \
245  MOV_32_ONLY" "TAN1", (%0) \n\t" \
246  "movdqa "REG0", "XMMS" \n\t" \
247  "psubsw "REG4", "REG0" \n\t" \
248  "paddsw "XMMS", "REG4" \n\t" \
249  "movdqa "REG4", "XMMS" \n\t" \
250  "psubsw %%xmm7, "REG4" \n\t" \
251  "paddsw "XMMS", %%xmm7 \n\t" \
252  "movdqa "REG0", "XMMS" \n\t" \
253  "psubsw %%xmm5, "REG0" \n\t" \
254  "paddsw "XMMS", %%xmm5 \n\t" \
255  "movdqa %%xmm5, "XMMS" \n\t" \
256  "psubsw "TAN3", %%xmm5 \n\t" \
257  "paddsw "XMMS", "TAN3" \n\t" \
258  "movdqa "REG0", "XMMS" \n\t" \
259  "psubsw %%xmm3, "REG0" \n\t" \
260  "paddsw "XMMS", %%xmm3 \n\t" \
261  MOV_32_ONLY" (%0), "TAN1" \n\t" \
262  "psraw $6, %%xmm5 \n\t" \
263  "psraw $6, "REG0" \n\t" \
264  "psraw $6, "TAN3" \n\t" \
265  "psraw $6, %%xmm3 \n\t" \
266  "movdqa "TAN3", 1*16("dct") \n\t" \
267  "movdqa %%xmm3, 2*16("dct") \n\t" \
268  "movdqa "REG0", 5*16("dct") \n\t" \
269  "movdqa %%xmm5, 6*16("dct") \n\t" \
270  "movdqa %%xmm7, %%xmm0 \n\t" \
271  "movdqa "REG4", %%xmm4 \n\t" \
272  "psubsw %%xmm1, %%xmm7 \n\t" \
273  "psubsw "TAN1", "REG4" \n\t" \
274  "paddsw %%xmm0, %%xmm1 \n\t" \
275  "paddsw %%xmm4, "TAN1" \n\t" \
276  "psraw $6, %%xmm1 \n\t" \
277  "psraw $6, %%xmm7 \n\t" \
278  "psraw $6, "TAN1" \n\t" \
279  "psraw $6, "REG4" \n\t" \
280  "movdqa %%xmm1, ("dct") \n\t" \
281  "movdqa "TAN1", 3*16("dct") \n\t" \
282  "movdqa "REG4", 4*16("dct") \n\t" \
283  "movdqa %%xmm7, 7*16("dct") \n\t"
284 
285 ///IDCT pass on columns, assuming rows 4-7 are zero.
286 #define iLLM_PASS_SPARSE(dct) \
287  "pmulhw %%xmm4, "TAN3" \n\t" \
288  "paddsw %%xmm4, "TAN3" \n\t" \
289  "movdqa %%xmm6, %%xmm3 \n\t" \
290  "pmulhw %%xmm6, "TAN1" \n\t" \
291  "movdqa %%xmm4, %%xmm1 \n\t" \
292  "psubsw %%xmm1, %%xmm3 \n\t" \
293  "paddsw %%xmm6, %%xmm1 \n\t" \
294  "movdqa "TAN1", %%xmm6 \n\t" \
295  "psubsw "TAN3", "TAN1" \n\t" \
296  "paddsw %%xmm6, "TAN3" \n\t" \
297  "movdqa %%xmm3, %%xmm6 \n\t" \
298  "psubsw "TAN3", %%xmm3 \n\t" \
299  "paddsw %%xmm6, "TAN3" \n\t" \
300  "movdqa "MANGLE(sqrt2)", %%xmm4 \n\t" \
301  "pmulhw %%xmm4, %%xmm3 \n\t" \
302  "pmulhw %%xmm4, "TAN3" \n\t" \
303  "paddsw "TAN3", "TAN3" \n\t" \
304  "paddsw %%xmm3, %%xmm3 \n\t" \
305  "movdqa "MANGLE(tan2)", %%xmm5 \n\t" \
306  MOV_32_ONLY ROW2", "SREG2" \n\t" \
307  "pmulhw "SREG2", %%xmm5 \n\t" \
308  MOV_32_ONLY ROW0", "REG0" \n\t" \
309  "movdqa "REG0", %%xmm6 \n\t" \
310  "psubsw "SREG2", %%xmm6 \n\t" \
311  "paddsw "REG0", "SREG2" \n\t" \
312  MOV_32_ONLY" "TAN1", (%0) \n\t" \
313  "movdqa "REG0", "XMMS" \n\t" \
314  "psubsw %%xmm5, "REG0" \n\t" \
315  "paddsw "XMMS", %%xmm5 \n\t" \
316  "movdqa %%xmm5, "XMMS" \n\t" \
317  "psubsw "TAN3", %%xmm5 \n\t" \
318  "paddsw "XMMS", "TAN3" \n\t" \
319  "movdqa "REG0", "XMMS" \n\t" \
320  "psubsw %%xmm3, "REG0" \n\t" \
321  "paddsw "XMMS", %%xmm3 \n\t" \
322  MOV_32_ONLY" (%0), "TAN1" \n\t" \
323  "psraw $6, %%xmm5 \n\t" \
324  "psraw $6, "REG0" \n\t" \
325  "psraw $6, "TAN3" \n\t" \
326  "psraw $6, %%xmm3 \n\t" \
327  "movdqa "TAN3", 1*16("dct") \n\t" \
328  "movdqa %%xmm3, 2*16("dct") \n\t" \
329  "movdqa "REG0", 5*16("dct") \n\t" \
330  "movdqa %%xmm5, 6*16("dct") \n\t" \
331  "movdqa "SREG2", %%xmm0 \n\t" \
332  "movdqa %%xmm6, %%xmm4 \n\t" \
333  "psubsw %%xmm1, "SREG2" \n\t" \
334  "psubsw "TAN1", %%xmm6 \n\t" \
335  "paddsw %%xmm0, %%xmm1 \n\t" \
336  "paddsw %%xmm4, "TAN1" \n\t" \
337  "psraw $6, %%xmm1 \n\t" \
338  "psraw $6, "SREG2" \n\t" \
339  "psraw $6, "TAN1" \n\t" \
340  "psraw $6, %%xmm6 \n\t" \
341  "movdqa %%xmm1, ("dct") \n\t" \
342  "movdqa "TAN1", 3*16("dct") \n\t" \
343  "movdqa %%xmm6, 4*16("dct") \n\t" \
344  "movdqa "SREG2", 7*16("dct") \n\t"
345 
346 inline void ff_idct_xvid_sse2(short *block)
347 {
348  __asm__ volatile(
349  "movq "MANGLE(m127)", %%mm0 \n\t"
350  iMTX_MULT("(%0)", MANGLE(iTab1), ROUND(walkenIdctRounders), PUT_EVEN(ROW0))
351  iMTX_MULT("1*16(%0)", MANGLE(iTab2), ROUND(walkenIdctRounders+1*16), PUT_ODD(ROW1))
352  iMTX_MULT("2*16(%0)", MANGLE(iTab3), ROUND(walkenIdctRounders+2*16), PUT_EVEN(ROW2))
353 
354  TEST_TWO_ROWS("3*16(%0)", "4*16(%0)", "%%eax", "%%ecx", CLEAR_ODD(ROW3), CLEAR_EVEN(ROW4))
355  JZ("%%eax", "1f")
356  iMTX_MULT("3*16(%0)", MANGLE(iTab4), ROUND(walkenIdctRounders+3*16), PUT_ODD(ROW3))
357 
358  TEST_TWO_ROWS("5*16(%0)", "6*16(%0)", "%%eax", "%%edx", CLEAR_ODD(ROW5), CLEAR_EVEN(ROW6))
359  TEST_ONE_ROW("7*16(%0)", "%%esi", CLEAR_ODD(ROW7))
360  iLLM_HEAD
361  ".p2align 4 \n\t"
362  JNZ("%%ecx", "2f")
363  JNZ("%%eax", "3f")
364  JNZ("%%edx", "4f")
365  JNZ("%%esi", "5f")
366  iLLM_PASS_SPARSE("%0")
367  "jmp 6f \n\t"
368  "2: \n\t"
369  iMTX_MULT("4*16(%0)", MANGLE(iTab1), "#", PUT_EVEN(ROW4))
370  "3: \n\t"
371  iMTX_MULT("5*16(%0)", MANGLE(iTab4), ROUND(walkenIdctRounders+4*16), PUT_ODD(ROW5))
372  JZ("%%edx", "1f")
373  "4: \n\t"
374  iMTX_MULT("6*16(%0)", MANGLE(iTab3), ROUND(walkenIdctRounders+5*16), PUT_EVEN(ROW6))
375  JZ("%%esi", "1f")
376  "5: \n\t"
377  iMTX_MULT("7*16(%0)", MANGLE(iTab2), ROUND(walkenIdctRounders+5*16), PUT_ODD(ROW7))
378 #if ARCH_X86_32
379  iLLM_HEAD
380 #endif
381  iLLM_PASS("%0")
382  "6: \n\t"
383  : "+r"(block)
384  :
385  : XMM_CLOBBERS("%xmm0" , "%xmm1" , "%xmm2" , "%xmm3" ,
386  "%xmm4" , "%xmm5" , "%xmm6" , "%xmm7" ,)
387 #if ARCH_X86_64
388  XMM_CLOBBERS("%xmm8" , "%xmm9" , "%xmm10", "%xmm11",
389  "%xmm12", "%xmm13", "%xmm14",)
390 #endif
391  "%eax", "%ecx", "%edx", "%esi", "memory"
392  );
393 }
394 
395 void ff_idct_xvid_sse2_put(uint8_t *dest, int line_size, short *block)
396 {
397  ff_idct_xvid_sse2(block);
398  ff_put_pixels_clamped_mmx(block, dest, line_size);
399 }
400 
401 void ff_idct_xvid_sse2_add(uint8_t *dest, int line_size, short *block)
402 {
403  ff_idct_xvid_sse2(block);
404  ff_add_pixels_clamped_mmx(block, dest, line_size);
405 }
406 
407 #endif /* HAVE_SSE2_INLINE */
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