libavcodec/i386/idct_sse2_xvid.c

   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 "libavcodec/dsputil.h"
  42
  43 /*!
  44  * @file idct_sse2_xvid.c
  45  * @brief SSE2 idct compatible with xvidmmx
  46  */
  47
  48 #define X8(x)     x,x,x,x,x,x,x,x
  49
  50 #define ROW_SHIFT 11
  51 #define COL_SHIFT 6
  52
  53 DECLARE_ASM_CONST(16, int16_t, tan1[]) = {X8(13036)}; // tan( pi/16)
  54 DECLARE_ASM_CONST(16, int16_t, tan2[]) = {X8(27146)}; // tan(2pi/16) = sqrt(2)-1
  55 DECLARE_ASM_CONST(16, int16_t, tan3[]) = {X8(43790)}; // tan(3pi/16)-1
  56 DECLARE_ASM_CONST(16, int16_t, sqrt2[])= {X8(23170)}; // 0.5/sqrt(2)
  57 DECLARE_ASM_CONST(8,  uint8_t, m127[]) = {X8(127)};
  58
  59 DECLARE_ASM_CONST(16, int16_t, iTab1[]) = {
  60  0x4000, 0x539f, 0xc000, 0xac61, 0x4000, 0xdd5d, 0x4000, 0xdd5d,
  61  0x4000, 0x22a3, 0x4000, 0x22a3, 0xc000, 0x539f, 0x4000, 0xac61,
  62  0x3249, 0x11a8, 0x4b42, 0xee58, 0x11a8, 0x4b42, 0x11a8, 0xcdb7,
  63  0x58c5, 0x4b42, 0xa73b, 0xcdb7, 0x3249, 0xa73b, 0x4b42, 0xa73b
  64 };
  65
  66 DECLARE_ASM_CONST(16, int16_t, iTab2[]) = {
  67  0x58c5, 0x73fc, 0xa73b, 0x8c04, 0x58c5, 0xcff5, 0x58c5, 0xcff5,
  68  0x58c5, 0x300b, 0x58c5, 0x300b, 0xa73b, 0x73fc, 0x58c5, 0x8c04,
  69  0x45bf, 0x187e, 0x6862, 0xe782, 0x187e, 0x6862, 0x187e, 0xba41,
  70  0x7b21, 0x6862, 0x84df, 0xba41, 0x45bf, 0x84df, 0x6862, 0x84df
  71 };
  72
  73 DECLARE_ASM_CONST(16, int16_t, iTab3[]) = {
  74  0x539f, 0x6d41, 0xac61, 0x92bf, 0x539f, 0xd2bf, 0x539f, 0xd2bf,
  75  0x539f, 0x2d41, 0x539f, 0x2d41, 0xac61, 0x6d41, 0x539f, 0x92bf,
  76  0x41b3, 0x1712, 0x6254, 0xe8ee, 0x1712, 0x6254, 0x1712, 0xbe4d,
  77  0x73fc, 0x6254, 0x8c04, 0xbe4d, 0x41b3, 0x8c04, 0x6254, 0x8c04
  78 };
  79
  80 DECLARE_ASM_CONST(16, int16_t, iTab4[]) = {
  81  0x4b42, 0x6254, 0xb4be, 0x9dac, 0x4b42, 0xd746, 0x4b42, 0xd746,
  82  0x4b42, 0x28ba, 0x4b42, 0x28ba, 0xb4be, 0x6254, 0x4b42, 0x9dac,
  83  0x3b21, 0x14c3, 0x587e, 0xeb3d, 0x14c3, 0x587e, 0x14c3, 0xc4df,
  84  0x6862, 0x587e, 0x979e, 0xc4df, 0x3b21, 0x979e, 0x587e, 0x979e
  85 };
  86
  87 DECLARE_ASM_CONST(16, int32_t, walkenIdctRounders[]) = {
  88  65536, 65536, 65536, 65536,
  89   3597,  3597,  3597,  3597,
  90   2260,  2260,  2260,  2260,
  91   1203,  1203,  1203,  1203,
  92    120,   120,   120,   120,
  93    512,   512,   512,   512
  94 };
  95
  96 // Temporary storage before the column pass
  97 #define ROW1 "%%xmm6"
  98 #define ROW3 "%%xmm4"
  99 #define ROW5 "%%xmm5"
 100 #define ROW7 "%%xmm7"
 101
 102 #define CLEAR_ODD(r) "pxor  "r","r" \n\t"
 103 #define PUT_ODD(dst) "pshufhw  $0x1B, %%xmm2, "dst"   \n\t"
 104
 105 #ifdef ARCH_X86_64
 106
 107 # define ROW0 "%%xmm8"
 108 # define REG0 ROW0
 109 # define ROW2 "%%xmm9"
 110 # define REG2 ROW2
 111 # define ROW4 "%%xmm10"
 112 # define REG4 ROW4
 113 # define ROW6 "%%xmm11"
 114 # define REG6 ROW6
 115 # define CLEAR_EVEN(r) CLEAR_ODD(r)
 116 # define PUT_EVEN(dst) PUT_ODD(dst)
 117 # define XMMS "%%xmm12"
 118 # define MOV_32_ONLY "#"
 119 # define SREG2 REG2
 120 # define TAN3 "%%xmm13"
 121 # define TAN1 "%%xmm14"
 122
 123 #else
 124
 125 # define ROW0 "(%0)"
 126 # define REG0 "%%xmm4"
 127 # define ROW2 "2*16(%0)"
 128 # define REG2 "%%xmm4"
 129 # define ROW4 "4*16(%0)"
 130 # define REG4 "%%xmm6"
 131 # define ROW6 "6*16(%0)"
 132 # define REG6 "%%xmm6"
 133 # define CLEAR_EVEN(r)
 134 # define PUT_EVEN(dst) \
 135     "pshufhw  $0x1B, %%xmm2, %%xmm2   \n\t" \
 136     "movdqa          %%xmm2, "dst"    \n\t"
 137 # define XMMS "%%xmm2"
 138 # define MOV_32_ONLY "movdqa "
 139 # define SREG2 "%%xmm7"
 140 # define TAN3 "%%xmm0"
 141 # define TAN1 "%%xmm2"
 142
 143 #endif
 144
 145 #define ROUND(x) "paddd   "MANGLE(x)
 146
 147 #define JZ(reg, to)                         \
 148     "testl     "reg","reg"            \n\t" \
 149     "jz        "to"                   \n\t"
 150
 151 #define JNZ(reg, to)                        \
 152     "testl     "reg","reg"            \n\t" \
 153     "jnz       "to"                   \n\t"
 154
 155 #define TEST_ONE_ROW(src, reg, clear)       \
 156     clear                                   \
 157     "movq     "src", %%mm1            \n\t" \
 158     "por    8+"src", %%mm1            \n\t" \
 159     "paddusb  %%mm0, %%mm1            \n\t" \
 160     "pmovmskb %%mm1, "reg"            \n\t"
 161
 162 #define TEST_TWO_ROWS(row1, row2, reg1, reg2, clear1, clear2) \
 163     clear1                                  \
 164     clear2                                  \
 165     "movq     "row1", %%mm1           \n\t" \
 166     "por    8+"row1", %%mm1           \n\t" \
 167     "movq     "row2", %%mm2           \n\t" \
 168     "por    8+"row2", %%mm2           \n\t" \
 169     "paddusb   %%mm0, %%mm1           \n\t" \
 170     "paddusb   %%mm0, %%mm2           \n\t" \
 171     "pmovmskb  %%mm1, "reg1"          \n\t" \
 172     "pmovmskb  %%mm2, "reg2"          \n\t"
 173
 174 ///IDCT pass on rows.
 175 #define iMTX_MULT(src, table, rounder, put) \
 176     "movdqa        "src", %%xmm3      \n\t" \
 177     "movdqa       %%xmm3, %%xmm0      \n\t" \
 178     "pshufd   $0x11, %%xmm3, %%xmm1   \n\t" /* 4602 */ \
 179     "punpcklqdq   %%xmm0, %%xmm0      \n\t" /* 0246 */ \
 180     "pmaddwd     "table", %%xmm0      \n\t" \
 181     "pmaddwd  16+"table", %%xmm1      \n\t" \
 182     "pshufd   $0xBB, %%xmm3, %%xmm2   \n\t" /* 5713 */ \
 183     "punpckhqdq   %%xmm3, %%xmm3      \n\t" /* 1357 */ \
 184     "pmaddwd  32+"table", %%xmm2      \n\t" \
 185     "pmaddwd  48+"table", %%xmm3      \n\t" \
 186     "paddd        %%xmm1, %%xmm0      \n\t" \
 187     "paddd        %%xmm3, %%xmm2      \n\t" \
 188     rounder",     %%xmm0              \n\t" \
 189     "movdqa       %%xmm2, %%xmm3      \n\t" \
 190     "paddd        %%xmm0, %%xmm2      \n\t" \
 191     "psubd        %%xmm3, %%xmm0      \n\t" \
 192     "psrad           $11, %%xmm2      \n\t" \
 193     "psrad           $11, %%xmm0      \n\t" \
 194     "packssdw     %%xmm0, %%xmm2      \n\t" \
 195     put                                     \
 196     "1:                               \n\t"
 197
 198 #define iLLM_HEAD                           \
 199     "movdqa   "MANGLE(tan3)", "TAN3"  \n\t" \
 200     "movdqa   "MANGLE(tan1)", "TAN1"  \n\t" \
 201
 202 ///IDCT pass on columns.
 203 #define iLLM_PASS(dct)                      \
 204     "movdqa   "TAN3", %%xmm1          \n\t" \
 205     "movdqa   "TAN1", %%xmm3          \n\t" \
 206     "pmulhw   %%xmm4, "TAN3"          \n\t" \
 207     "pmulhw   %%xmm5, %%xmm1          \n\t" \
 208     "paddsw   %%xmm4, "TAN3"          \n\t" \
 209     "paddsw   %%xmm5, %%xmm1          \n\t" \
 210     "psubsw   %%xmm5, "TAN3"          \n\t" \
 211     "paddsw   %%xmm4, %%xmm1          \n\t" \
 212     "pmulhw   %%xmm7, %%xmm3          \n\t" \
 213     "pmulhw   %%xmm6, "TAN1"          \n\t" \
 214     "paddsw   %%xmm6, %%xmm3          \n\t" \
 215     "psubsw   %%xmm7, "TAN1"          \n\t" \
 216     "movdqa   %%xmm3, %%xmm7          \n\t" \
 217     "movdqa   "TAN1", %%xmm6          \n\t" \
 218     "psubsw   %%xmm1, %%xmm3          \n\t" \
 219     "psubsw   "TAN3", "TAN1"          \n\t" \
 220     "paddsw   %%xmm7, %%xmm1          \n\t" \
 221     "paddsw   %%xmm6, "TAN3"          \n\t" \
 222     "movdqa   %%xmm3, %%xmm6          \n\t" \
 223     "psubsw   "TAN3", %%xmm3          \n\t" \
 224     "paddsw   %%xmm6, "TAN3"          \n\t" \
 225     "movdqa   "MANGLE(sqrt2)", %%xmm4 \n\t" \
 226     "pmulhw   %%xmm4, %%xmm3          \n\t" \
 227     "pmulhw   %%xmm4, "TAN3"          \n\t" \
 228     "paddsw   "TAN3", "TAN3"          \n\t" \
 229     "paddsw   %%xmm3, %%xmm3          \n\t" \
 230     "movdqa   "MANGLE(tan2)", %%xmm7  \n\t" \
 231     MOV_32_ONLY ROW2", "REG2"         \n\t" \
 232     MOV_32_ONLY ROW6", "REG6"         \n\t" \
 233     "movdqa   %%xmm7, %%xmm5          \n\t" \
 234     "pmulhw   "REG6", %%xmm7          \n\t" \
 235     "pmulhw   "REG2", %%xmm5          \n\t" \
 236     "paddsw   "REG2", %%xmm7          \n\t" \
 237     "psubsw   "REG6", %%xmm5          \n\t" \
 238     MOV_32_ONLY ROW0", "REG0"         \n\t" \
 239     MOV_32_ONLY ROW4", "REG4"         \n\t" \
 240     MOV_32_ONLY"  "TAN1", (%0)        \n\t" \
 241     "movdqa   "REG0", "XMMS"          \n\t" \
 242     "psubsw   "REG4", "REG0"          \n\t" \
 243     "paddsw   "XMMS", "REG4"          \n\t" \
 244     "movdqa   "REG4", "XMMS"          \n\t" \
 245     "psubsw   %%xmm7, "REG4"          \n\t" \
 246     "paddsw   "XMMS", %%xmm7          \n\t" \
 247     "movdqa   "REG0", "XMMS"          \n\t" \
 248     "psubsw   %%xmm5, "REG0"          \n\t" \
 249     "paddsw   "XMMS", %%xmm5          \n\t" \
 250     "movdqa   %%xmm5, "XMMS"          \n\t" \
 251     "psubsw   "TAN3", %%xmm5          \n\t" \
 252     "paddsw   "XMMS", "TAN3"          \n\t" \
 253     "movdqa   "REG0", "XMMS"          \n\t" \
 254     "psubsw   %%xmm3, "REG0"          \n\t" \
 255     "paddsw   "XMMS", %%xmm3          \n\t" \
 256     MOV_32_ONLY"  (%0), "TAN1"        \n\t" \
 257     "psraw        $6, %%xmm5          \n\t" \
 258     "psraw        $6, "REG0"          \n\t" \
 259     "psraw        $6, "TAN3"          \n\t" \
 260     "psraw        $6, %%xmm3          \n\t" \
 261     "movdqa   "TAN3", 1*16("dct")     \n\t" \
 262     "movdqa   %%xmm3, 2*16("dct")     \n\t" \
 263     "movdqa   "REG0", 5*16("dct")     \n\t" \
 264     "movdqa   %%xmm5, 6*16("dct")     \n\t" \
 265     "movdqa   %%xmm7, %%xmm0          \n\t" \
 266     "movdqa   "REG4", %%xmm4          \n\t" \
 267     "psubsw   %%xmm1, %%xmm7          \n\t" \
 268     "psubsw   "TAN1", "REG4"          \n\t" \
 269     "paddsw   %%xmm0, %%xmm1          \n\t" \
 270     "paddsw   %%xmm4, "TAN1"          \n\t" \
 271     "psraw        $6, %%xmm1          \n\t" \
 272     "psraw        $6, %%xmm7          \n\t" \
 273     "psraw        $6, "TAN1"          \n\t" \
 274     "psraw        $6, "REG4"          \n\t" \
 275     "movdqa   %%xmm1, ("dct")         \n\t" \
 276     "movdqa   "TAN1", 3*16("dct")     \n\t" \
 277     "movdqa   "REG4", 4*16("dct")     \n\t" \
 278     "movdqa   %%xmm7, 7*16("dct")     \n\t"
 279
 280 ///IDCT pass on columns, assuming rows 4-7 are zero.
 281 #define iLLM_PASS_SPARSE(dct)               \
 282     "pmulhw   %%xmm4, "TAN3"          \n\t" \
 283     "paddsw   %%xmm4, "TAN3"          \n\t" \
 284     "movdqa   %%xmm6, %%xmm3          \n\t" \
 285     "pmulhw   %%xmm6, "TAN1"          \n\t" \
 286     "movdqa   %%xmm4, %%xmm1          \n\t" \
 287     "psubsw   %%xmm1, %%xmm3          \n\t" \
 288     "paddsw   %%xmm6, %%xmm1          \n\t" \
 289     "movdqa   "TAN1", %%xmm6          \n\t" \
 290     "psubsw   "TAN3", "TAN1"          \n\t" \
 291     "paddsw   %%xmm6, "TAN3"          \n\t" \
 292     "movdqa   %%xmm3, %%xmm6          \n\t" \
 293     "psubsw   "TAN3", %%xmm3          \n\t" \
 294     "paddsw   %%xmm6, "TAN3"          \n\t" \
 295     "movdqa   "MANGLE(sqrt2)", %%xmm4 \n\t" \
 296     "pmulhw   %%xmm4, %%xmm3          \n\t" \
 297     "pmulhw   %%xmm4, "TAN3"          \n\t" \
 298     "paddsw   "TAN3", "TAN3"          \n\t" \
 299     "paddsw   %%xmm3, %%xmm3          \n\t" \
 300     "movdqa   "MANGLE(tan2)", %%xmm5  \n\t" \
 301     MOV_32_ONLY ROW2", "SREG2"        \n\t" \
 302     "pmulhw   "SREG2", %%xmm5         \n\t" \
 303     MOV_32_ONLY ROW0", "REG0"         \n\t" \
 304     "movdqa   "REG0", %%xmm6          \n\t" \
 305     "psubsw   "SREG2", %%xmm6         \n\t" \
 306     "paddsw   "REG0", "SREG2"         \n\t" \
 307     MOV_32_ONLY"  "TAN1", (%0)        \n\t" \
 308     "movdqa   "REG0", "XMMS"          \n\t" \
 309     "psubsw   %%xmm5, "REG0"          \n\t" \
 310     "paddsw   "XMMS", %%xmm5          \n\t" \
 311     "movdqa   %%xmm5, "XMMS"          \n\t" \
 312     "psubsw   "TAN3", %%xmm5          \n\t" \
 313     "paddsw   "XMMS", "TAN3"          \n\t" \
 314     "movdqa   "REG0", "XMMS"          \n\t" \
 315     "psubsw   %%xmm3, "REG0"          \n\t" \
 316     "paddsw   "XMMS", %%xmm3          \n\t" \
 317     MOV_32_ONLY"  (%0), "TAN1"        \n\t" \
 318     "psraw        $6, %%xmm5          \n\t" \
 319     "psraw        $6, "REG0"          \n\t" \
 320     "psraw        $6, "TAN3"          \n\t" \
 321     "psraw        $6, %%xmm3          \n\t" \
 322     "movdqa   "TAN3", 1*16("dct")     \n\t" \
 323     "movdqa   %%xmm3, 2*16("dct")     \n\t" \
 324     "movdqa   "REG0", 5*16("dct")     \n\t" \
 325     "movdqa   %%xmm5, 6*16("dct")     \n\t" \
 326     "movdqa   "SREG2", %%xmm0         \n\t" \
 327     "movdqa   %%xmm6, %%xmm4          \n\t" \
 328     "psubsw   %%xmm1, "SREG2"         \n\t" \
 329     "psubsw   "TAN1", %%xmm6          \n\t" \
 330     "paddsw   %%xmm0, %%xmm1          \n\t" \
 331     "paddsw   %%xmm4, "TAN1"          \n\t" \
 332     "psraw        $6, %%xmm1          \n\t" \
 333     "psraw        $6, "SREG2"         \n\t" \
 334     "psraw        $6, "TAN1"          \n\t" \
 335     "psraw        $6, %%xmm6          \n\t" \
 336     "movdqa   %%xmm1, ("dct")         \n\t" \
 337     "movdqa   "TAN1", 3*16("dct")     \n\t" \
 338     "movdqa   %%xmm6, 4*16("dct")     \n\t" \
 339     "movdqa   "SREG2", 7*16("dct")    \n\t"
 340
 341 inline void ff_idct_xvid_sse2(short *block)
 342 {
 343     asm volatile(
 344     "movq     "MANGLE(m127)", %%mm0                              \n\t"
 345     iMTX_MULT("(%0)",     MANGLE(iTab1), ROUND(walkenIdctRounders),      PUT_EVEN(ROW0))
 346     iMTX_MULT("1*16(%0)", MANGLE(iTab2), ROUND(walkenIdctRounders+1*16), PUT_ODD(ROW1))
 347     iMTX_MULT("2*16(%0)", MANGLE(iTab3), ROUND(walkenIdctRounders+2*16), PUT_EVEN(ROW2))
 348
 349     TEST_TWO_ROWS("3*16(%0)", "4*16(%0)", "%%eax", "%%ecx", CLEAR_ODD(ROW3), CLEAR_EVEN(ROW4))
 350     JZ("%%eax", "1f")
 351     iMTX_MULT("3*16(%0)", MANGLE(iTab4), ROUND(walkenIdctRounders+3*16), PUT_ODD(ROW3))
 352
 353     TEST_TWO_ROWS("5*16(%0)", "6*16(%0)", "%%eax", "%%edx", CLEAR_ODD(ROW5), CLEAR_EVEN(ROW6))
 354     TEST_ONE_ROW("7*16(%0)", "%%esi", CLEAR_ODD(ROW7))
 355     iLLM_HEAD
 356     ASMALIGN(4)
 357     JNZ("%%ecx", "2f")
 358     JNZ("%%eax", "3f")
 359     JNZ("%%edx", "4f")
 360     JNZ("%%esi", "5f")
 361     iLLM_PASS_SPARSE("%0")
 362     "jmp 6f                                                      \n\t"
 363     "2:                                                          \n\t"
 364     iMTX_MULT("4*16(%0)", MANGLE(iTab1), "#", PUT_EVEN(ROW4))
 365     "3:                                                          \n\t"
 366     iMTX_MULT("5*16(%0)", MANGLE(iTab4), ROUND(walkenIdctRounders+4*16), PUT_ODD(ROW5))
 367     JZ("%%edx", "1f")
 368     "4:                                                          \n\t"
 369     iMTX_MULT("6*16(%0)", MANGLE(iTab3), ROUND(walkenIdctRounders+5*16), PUT_EVEN(ROW6))
 370     JZ("%%esi", "1f")
 371     "5:                                                          \n\t"
 372     iMTX_MULT("7*16(%0)", MANGLE(iTab2), ROUND(walkenIdctRounders+5*16), PUT_ODD(ROW7))
 373 #ifndef ARCH_X86_64
 374     iLLM_HEAD
 375 #endif
 376     iLLM_PASS("%0")
 377     "6:                                                          \n\t"
 378     : "+r"(block)
 379     :
 380     : "%eax", "%ecx", "%edx", "%esi", "memory");
 381 }
 382
 383 void ff_idct_xvid_sse2_put(uint8_t *dest, int line_size, short *block)
 384 {
 385     ff_idct_xvid_sse2(block);
 386     put_pixels_clamped_mmx(block, dest, line_size);
 387 }
 388
 389 void ff_idct_xvid_sse2_add(uint8_t *dest, int line_size, short *block)
 390 {
 391     ff_idct_xvid_sse2(block);
 392     add_pixels_clamped_mmx(block, dest, line_size);
 393 }