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FFmpeg/libavcodec/x86/idct_mmx_xvid.c

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  1. /*

  2.  * XVID MPEG-4 VIDEO CODEC

  3.  * - MMX and XMM forward discrete cosine transform -

  4.  *

  5.  * Copyright(C) 2001 Peter Ross <pross@xvid.org>

  6.  *

  7.  * Originally provided by Intel at AP-922

  8.  * http://developer.intel.com/vtune/cbts/strmsimd/922down.htm

  9.  * (See more app notes at http://developer.intel.com/vtune/cbts/strmsimd/appnotes.htm)

  10.  * but in a limited edition.

  11.  * New macro implements a column part for precise iDCT

  12.  * The routine precision now satisfies IEEE standard 1180-1990.

  13.  *

  14.  * Copyright(C) 2000-2001 Peter Gubanov <peter@elecard.net.ru>

  15.  * Rounding trick Copyright(C) 2000 Michel Lespinasse <walken@zoy.org>

  16.  *

  17.  * http://www.elecard.com/peter/idct.html

  18.  * http://www.linuxvideo.org/mpeg2dec/

  19.  *

  20.  * These examples contain code fragments for first stage iDCT 8x8

  21.  * (for rows) and first stage DCT 8x8 (for columns)

  22.  *

  23.  * conversion to gcc syntax by Michael Niedermayer

  24.  *

  25.  * This file is part of Libav.

  26.  *

  27.  * Libav is free software; you can redistribute it and/or

  28.  * modify it under the terms of the GNU Lesser General Public

  29.  * License as published by the Free Software Foundation; either

  30.  * version 2.1 of the License, or (at your option) any later version.

  31.  *

  32.  * Libav is distributed in the hope that it will be useful,

  33.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  34.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  35.  * Lesser General Public License for more details.

  36.  *

  37.  * You should have received a copy of the GNU Lesser General Public License

  38.  * along with Libav; if not, write to the Free Software Foundation,

  39.  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  40.  */

  41. 

  42. #include <inttypes.h>

  43. #include "libavcodec/avcodec.h"

  44. #include "idct_xvid.h"

  45. 

  46. //=============================================================================

  47. // Macros and other preprocessor constants

  48. //=============================================================================

  49. 

  50. #define BITS_INV_ACC    5                              // 4 or 5 for IEEE

  51. #define SHIFT_INV_ROW   (16 - BITS_INV_ACC) //11

  52. #define SHIFT_INV_COL   (1 + BITS_INV_ACC) //6

  53. #define RND_INV_ROW     (1024 * (6 - BITS_INV_ACC))

  54. #define RND_INV_COL     (16 * (BITS_INV_ACC - 3))

  55. #define RND_INV_CORR    (RND_INV_COL - 1)

  56. 

  57. #define BITS_FRW_ACC    3                              // 2 or 3 for accuracy

  58. #define SHIFT_FRW_COL   BITS_FRW_ACC

  59. #define SHIFT_FRW_ROW   (BITS_FRW_ACC + 17)

  60. #define RND_FRW_ROW     (262144*(BITS_FRW_ACC - 1))

  61. 

  62. 

  63. //-----------------------------------------------------------------------------

  64. // Various memory constants (trigonometric values or rounding values)

  65. //-----------------------------------------------------------------------------

  66. 

  67. 

  68. DECLARE_ALIGNED(8, static const int16_t, tg_1_16)[4*4] = {

  69.   13036,13036,13036,13036,        // tg * (2<<16) + 0.5

  70.   27146,27146,27146,27146,        // tg * (2<<16) + 0.5

  71.   -21746,-21746,-21746,-21746,    // tg * (2<<16) + 0.5

  72.   23170,23170,23170,23170};       // cos * (2<<15) + 0.5

  73. 

  74. DECLARE_ALIGNED(8, static const int32_t, rounder_0)[2*8] = {

  75.   65536,65536,

  76.   3597,3597,

  77.   2260,2260,

  78.   1203,1203,

  79.   0,0,

  80.   120,120,

  81.   512,512,

  82.   512,512};

  83. 

  84. //-----------------------------------------------------------------------------

  85. //

  86. // The first stage iDCT 8x8 - inverse DCTs of rows

  87. //

  88. //-----------------------------------------------------------------------------

  89. // The 8-point inverse DCT direct algorithm

  90. //-----------------------------------------------------------------------------

  91. //

  92. // static const short w[32] = {

  93. //       FIX(cos_4_16),  FIX(cos_2_16),  FIX(cos_4_16),  FIX(cos_6_16),

  94. //       FIX(cos_4_16),  FIX(cos_6_16), -FIX(cos_4_16), -FIX(cos_2_16),

  95. //       FIX(cos_4_16), -FIX(cos_6_16), -FIX(cos_4_16),  FIX(cos_2_16),

  96. //       FIX(cos_4_16), -FIX(cos_2_16),  FIX(cos_4_16), -FIX(cos_6_16),

  97. //       FIX(cos_1_16),  FIX(cos_3_16),  FIX(cos_5_16),  FIX(cos_7_16),

  98. //       FIX(cos_3_16), -FIX(cos_7_16), -FIX(cos_1_16), -FIX(cos_5_16),

  99. //       FIX(cos_5_16), -FIX(cos_1_16),  FIX(cos_7_16),  FIX(cos_3_16),

  100. //       FIX(cos_7_16), -FIX(cos_5_16),  FIX(cos_3_16), -FIX(cos_1_16) };

  101. //

  102. // #define DCT_8_INV_ROW(x, y)

  103. // {

  104. //       int a0, a1, a2, a3, b0, b1, b2, b3;

  105. //

  106. //       a0 =x[0]*w[0]+x[2]*w[1]+x[4]*w[2]+x[6]*w[3];

  107. //       a1 =x[0]*w[4]+x[2]*w[5]+x[4]*w[6]+x[6]*w[7];

  108. //       a2 = x[0] * w[ 8] + x[2] * w[ 9] + x[4] * w[10] + x[6] * w[11];

  109. //       a3 = x[0] * w[12] + x[2] * w[13] + x[4] * w[14] + x[6] * w[15];

  110. //       b0 = x[1] * w[16] + x[3] * w[17] + x[5] * w[18] + x[7] * w[19];

  111. //       b1 = x[1] * w[20] + x[3] * w[21] + x[5] * w[22] + x[7] * w[23];

  112. //       b2 = x[1] * w[24] + x[3] * w[25] + x[5] * w[26] + x[7] * w[27];

  113. //       b3 = x[1] * w[28] + x[3] * w[29] + x[5] * w[30] + x[7] * w[31];

  114. //

  115. //       y[0] = SHIFT_ROUND ( a0 + b0 );

  116. //       y[1] = SHIFT_ROUND ( a1 + b1 );

  117. //       y[2] = SHIFT_ROUND ( a2 + b2 );

  118. //       y[3] = SHIFT_ROUND ( a3 + b3 );

  119. //       y[4] = SHIFT_ROUND ( a3 - b3 );

  120. //       y[5] = SHIFT_ROUND ( a2 - b2 );

  121. //       y[6] = SHIFT_ROUND ( a1 - b1 );

  122. //       y[7] = SHIFT_ROUND ( a0 - b0 );

  123. // }

  124. //

  125. //-----------------------------------------------------------------------------

  126. //

  127. // In this implementation the outputs of the iDCT-1D are multiplied

  128. //       for rows 0,4 - by cos_4_16,

  129. //       for rows 1,7 - by cos_1_16,

  130. //       for rows 2,6 - by cos_2_16,

  131. //       for rows 3,5 - by cos_3_16

  132. // and are shifted to the left for better accuracy

  133. //

  134. // For the constants used,

  135. //       FIX(float_const) = (short) (float_const * (1<<15) + 0.5)

  136. //

  137. //-----------------------------------------------------------------------------

  138. 

  139. //-----------------------------------------------------------------------------

  140. // Tables for mmx processors

  141. //-----------------------------------------------------------------------------

  142. 

  143. // Table for rows 0,4 - constants are multiplied by cos_4_16

  144. DECLARE_ALIGNED(8, static const int16_t, tab_i_04_mmx)[32*4] = {

  145.   16384,16384,16384,-16384,       // movq-> w06 w04 w02 w00

  146.   21407,8867,8867,-21407,         // w07 w05 w03 w01

  147.   16384,-16384,16384,16384,       // w14 w12 w10 w08

  148.   -8867,21407,-21407,-8867,       // w15 w13 w11 w09

  149.   22725,12873,19266,-22725,       // w22 w20 w18 w16

  150.   19266,4520,-4520,-12873,        // w23 w21 w19 w17

  151.   12873,4520,4520,19266,          // w30 w28 w26 w24

  152.   -22725,19266,-12873,-22725,     // w31 w29 w27 w25

  153. // Table for rows 1,7 - constants are multiplied by cos_1_16

  154.   22725,22725,22725,-22725,       // movq-> w06 w04 w02 w00

  155.   29692,12299,12299,-29692,       // w07 w05 w03 w01

  156.   22725,-22725,22725,22725,       // w14 w12 w10 w08

  157.   -12299,29692,-29692,-12299,     // w15 w13 w11 w09

  158.   31521,17855,26722,-31521,       // w22 w20 w18 w16

  159.   26722,6270,-6270,-17855,        // w23 w21 w19 w17

  160.   17855,6270,6270,26722,          // w30 w28 w26 w24

  161.   -31521,26722,-17855,-31521,     // w31 w29 w27 w25

  162. // Table for rows 2,6 - constants are multiplied by cos_2_16

  163.   21407,21407,21407,-21407,       // movq-> w06 w04 w02 w00

  164.   27969,11585,11585,-27969,       // w07 w05 w03 w01

  165.   21407,-21407,21407,21407,       // w14 w12 w10 w08

  166.   -11585,27969,-27969,-11585,     // w15 w13 w11 w09

  167.   29692,16819,25172,-29692,       // w22 w20 w18 w16

  168.   25172,5906,-5906,-16819,        // w23 w21 w19 w17

  169.   16819,5906,5906,25172,          // w30 w28 w26 w24

  170.   -29692,25172,-16819,-29692,     // w31 w29 w27 w25

  171. // Table for rows 3,5 - constants are multiplied by cos_3_16

  172.   19266,19266,19266,-19266,       // movq-> w06 w04 w02 w00

  173.   25172,10426,10426,-25172,       // w07 w05 w03 w01

  174.   19266,-19266,19266,19266,       // w14 w12 w10 w08

  175.   -10426,25172,-25172,-10426,     // w15 w13 w11 w09

  176.   26722,15137,22654,-26722,       // w22 w20 w18 w16

  177.   22654,5315,-5315,-15137,        // w23 w21 w19 w17

  178.   15137,5315,5315,22654,          // w30 w28 w26 w24

  179.   -26722,22654,-15137,-26722,     // w31 w29 w27 w25

  180. };

  181. //-----------------------------------------------------------------------------

  182. // Tables for xmm processors

  183. //-----------------------------------------------------------------------------

  184. 

  185. // %3 for rows 0,4 - constants are multiplied by cos_4_16

  186. DECLARE_ALIGNED(8, static const int16_t, tab_i_04_xmm)[32*4] = {

  187.   16384,21407,16384,8867,      // movq-> w05 w04 w01 w00

  188.   16384,8867,-16384,-21407,    // w07 w06 w03 w02

  189.   16384,-8867,16384,-21407,    // w13 w12 w09 w08

  190.   -16384,21407,16384,-8867,    // w15 w14 w11 w10

  191.   22725,19266,19266,-4520,     // w21 w20 w17 w16

  192.   12873,4520,-22725,-12873,    // w23 w22 w19 w18

  193.   12873,-22725,4520,-12873,    // w29 w28 w25 w24

  194.   4520,19266,19266,-22725,     // w31 w30 w27 w26

  195. // %3 for rows 1,7 - constants are multiplied by cos_1_16

  196.   22725,29692,22725,12299,     // movq-> w05 w04 w01 w00

  197.   22725,12299,-22725,-29692,   // w07 w06 w03 w02

  198.   22725,-12299,22725,-29692,   // w13 w12 w09 w08

  199.   -22725,29692,22725,-12299,   // w15 w14 w11 w10

  200.   31521,26722,26722,-6270,     // w21 w20 w17 w16

  201.   17855,6270,-31521,-17855,    // w23 w22 w19 w18

  202.   17855,-31521,6270,-17855,    // w29 w28 w25 w24

  203.   6270,26722,26722,-31521,     // w31 w30 w27 w26

  204. // %3 for rows 2,6 - constants are multiplied by cos_2_16

  205.   21407,27969,21407,11585,     // movq-> w05 w04 w01 w00

  206.   21407,11585,-21407,-27969,   // w07 w06 w03 w02

  207.   21407,-11585,21407,-27969,   // w13 w12 w09 w08

  208.   -21407,27969,21407,-11585,   // w15 w14 w11 w10

  209.   29692,25172,25172,-5906,     // w21 w20 w17 w16

  210.   16819,5906,-29692,-16819,    // w23 w22 w19 w18

  211.   16819,-29692,5906,-16819,    // w29 w28 w25 w24

  212.   5906,25172,25172,-29692,     // w31 w30 w27 w26

  213. // %3 for rows 3,5 - constants are multiplied by cos_3_16

  214.   19266,25172,19266,10426,     // movq-> w05 w04 w01 w00

  215.   19266,10426,-19266,-25172,   // w07 w06 w03 w02

  216.   19266,-10426,19266,-25172,   // w13 w12 w09 w08

  217.   -19266,25172,19266,-10426,   // w15 w14 w11 w10

  218.   26722,22654,22654,-5315,     // w21 w20 w17 w16

  219.   15137,5315,-26722,-15137,    // w23 w22 w19 w18

  220.   15137,-26722,5315,-15137,    // w29 w28 w25 w24

  221.   5315,22654,22654,-26722,     // w31 w30 w27 w26

  222. };

  223. //=============================================================================

  224. // Helper macros for the code

  225. //=============================================================================

  226. 

  227. //-----------------------------------------------------------------------------

  228. // DCT_8_INV_ROW_MMX( INP, OUT, TABLE, ROUNDER

  229. //-----------------------------------------------------------------------------

  230. 

  231. #define DCT_8_INV_ROW_MMX(A1,A2,A3,A4)\

  232.   "movq " #A1 ",%%mm0              \n\t"/* 0 ; x3 x2 x1 x0*/\

  233.   "movq 8+" #A1 ",%%mm1            \n\t"/* 1 ; x7 x6 x5 x4*/\

  234.   "movq %%mm0,%%mm2            \n\t"/* 2  ; x3 x2 x1 x0*/\

  235.   "movq " #A3 ",%%mm3              \n\t"/* 3 ; w06 w04 w02 w00*/\

  236.   "punpcklwd %%mm1,%%mm0       \n\t"/* x5 x1 x4 x0*/\

  237.   "movq %%mm0,%%mm5            \n\t"/* 5 ; x5 x1 x4 x0*/\

  238.   "punpckldq %%mm0,%%mm0       \n\t"/* x4 x0 x4 x0*/\

  239.   "movq 8+" #A3 ",%%mm4            \n\t"/* 4 ; w07 w05 w03 w01*/\

  240.   "punpckhwd %%mm1,%%mm2       \n\t"/* 1 ; x7 x3 x6 x2*/\

  241.   "pmaddwd %%mm0,%%mm3         \n\t"/* x4*w06+x0*w04 x4*w02+x0*w00*/\

  242.   "movq %%mm2,%%mm6            \n\t"/* 6 ; x7 x3 x6 x2*/\

  243.   "movq 32+" #A3 ",%%mm1           \n\t"/* 1 ; w22 w20 w18 w16*/\

  244.   "punpckldq %%mm2,%%mm2       \n\t"/* x6 x2 x6 x2*/\

  245.   "pmaddwd %%mm2,%%mm4         \n\t"/* x6*w07+x2*w05 x6*w03+x2*w01*/\

  246.   "punpckhdq %%mm5,%%mm5       \n\t"/* x5 x1 x5 x1*/\

  247.   "pmaddwd 16+" #A3 ",%%mm0        \n\t"/* x4*w14+x0*w12 x4*w10+x0*w08*/\

  248.   "punpckhdq %%mm6,%%mm6       \n\t"/* x7 x3 x7 x3*/\

  249.   "movq 40+" #A3 ",%%mm7           \n\t"/* 7 ; w23 w21 w19 w17*/\

  250.   "pmaddwd %%mm5,%%mm1         \n\t"/* x5*w22+x1*w20 x5*w18+x1*w16*/\

  251.   "paddd " #A4 ",%%mm3             \n\t"/* +%4*/\

  252.   "pmaddwd %%mm6,%%mm7         \n\t"/* x7*w23+x3*w21 x7*w19+x3*w17*/\

  253.   "pmaddwd 24+" #A3 ",%%mm2        \n\t"/* x6*w15+x2*w13 x6*w11+x2*w09*/\

  254.   "paddd %%mm4,%%mm3           \n\t"/* 4 ; a1=sum(even1) a0=sum(even0)*/\

  255.   "pmaddwd 48+" #A3 ",%%mm5        \n\t"/* x5*w30+x1*w28 x5*w26+x1*w24*/\

  256.   "movq %%mm3,%%mm4            \n\t"/* 4 ; a1 a0*/\

  257.   "pmaddwd 56+" #A3 ",%%mm6        \n\t"/* x7*w31+x3*w29 x7*w27+x3*w25*/\

  258.   "paddd %%mm7,%%mm1           \n\t"/* 7 ; b1=sum(odd1) b0=sum(odd0)*/\

  259.   "paddd " #A4 ",%%mm0             \n\t"/* +%4*/\

  260.   "psubd %%mm1,%%mm3           \n\t"/* a1-b1 a0-b0*/\

  261.   "psrad $11,%%mm3 \n\t"/* y6=a1-b1 y7=a0-b0*/\

  262.   "paddd %%mm4,%%mm1           \n\t"/* 4 ; a1+b1 a0+b0*/\

  263.   "paddd %%mm2,%%mm0           \n\t"/* 2 ; a3=sum(even3) a2=sum(even2)*/\

  264.   "psrad $11,%%mm1 \n\t"/* y1=a1+b1 y0=a0+b0*/\

  265.   "paddd %%mm6,%%mm5           \n\t"/* 6 ; b3=sum(odd3) b2=sum(odd2)*/\

  266.   "movq %%mm0,%%mm4            \n\t"/* 4 ; a3 a2*/\

  267.   "paddd %%mm5,%%mm0           \n\t"/* a3+b3 a2+b2*/\

  268.   "psubd %%mm5,%%mm4           \n\t"/* 5 ; a3-b3 a2-b2*/\

  269.   "psrad $11,%%mm0 \n\t"/* y3=a3+b3 y2=a2+b2*/\

  270.   "psrad $11,%%mm4 \n\t"/* y4=a3-b3 y5=a2-b2*/\

  271.   "packssdw %%mm0,%%mm1        \n\t"/* 0 ; y3 y2 y1 y0*/\

  272.   "packssdw %%mm3,%%mm4        \n\t"/* 3 ; y6 y7 y4 y5*/\

  273.   "movq %%mm4,%%mm7            \n\t"/* 7 ; y6 y7 y4 y5*/\

  274.   "psrld $16,%%mm4            \n\t"/* 0 y6 0 y4*/\

  275.   "pslld $16,%%mm7            \n\t"/* y7 0 y5 0*/\

  276.   "movq %%mm1," #A2 "              \n\t"/* 1 ; save y3 y2 y1 y0*/\

  277.   "por %%mm4,%%mm7             \n\t"/* 4 ; y7 y6 y5 y4*/\

  278.   "movq %%mm7,8            +" #A2 "\n\t"/* 7 ; save y7 y6 y5 y4*/\

  279. 

  280. 

  281. //-----------------------------------------------------------------------------

  282. // DCT_8_INV_ROW_XMM( INP, OUT, TABLE, ROUNDER

  283. //-----------------------------------------------------------------------------

  284. 

  285. #define DCT_8_INV_ROW_XMM(A1,A2,A3,A4)\

  286.   "movq " #A1 ",%%mm0                  \n\t"/* 0     ; x3 x2 x1 x0*/\

  287.   "movq 8+" #A1 ",%%mm1                \n\t"/* 1     ; x7 x6 x5 x4*/\

  288.   "movq %%mm0,%%mm2                \n\t"/* 2     ; x3 x2 x1 x0*/\

  289.   "movq " #A3 ",%%mm3                  \n\t"/* 3     ; w05 w04 w01 w00*/\

  290.   "pshufw $0x88,%%mm0,%%mm0        \n\t"/* x2 x0 x2 x0*/\

  291.   "movq 8+" #A3 ",%%mm4                \n\t"/* 4     ; w07 w06 w03 w02*/\

  292.   "movq %%mm1,%%mm5                \n\t"/* 5     ; x7 x6 x5 x4*/\

  293.   "pmaddwd %%mm0,%%mm3             \n\t"/* x2*w05+x0*w04 x2*w01+x0*w00*/\

  294.   "movq 32+" #A3 ",%%mm6               \n\t"/* 6     ; w21 w20 w17 w16*/\

  295.   "pshufw $0x88,%%mm1,%%mm1        \n\t"/* x6 x4 x6 x4*/\

  296.   "pmaddwd %%mm1,%%mm4             \n\t"/* x6*w07+x4*w06 x6*w03+x4*w02*/\

  297.   "movq 40+" #A3 ",%%mm7               \n\t"/* 7    ; w23 w22 w19 w18*/\

  298.   "pshufw $0xdd,%%mm2,%%mm2        \n\t"/* x3 x1 x3 x1*/\

  299.   "pmaddwd %%mm2,%%mm6             \n\t"/* x3*w21+x1*w20 x3*w17+x1*w16*/\

  300.   "pshufw $0xdd,%%mm5,%%mm5        \n\t"/* x7 x5 x7 x5*/\

  301.   "pmaddwd %%mm5,%%mm7             \n\t"/* x7*w23+x5*w22 x7*w19+x5*w18*/\

  302.   "paddd " #A4 ",%%mm3                 \n\t"/* +%4*/\

  303.   "pmaddwd 16+" #A3 ",%%mm0            \n\t"/* x2*w13+x0*w12 x2*w09+x0*w08*/\

  304.   "paddd %%mm4,%%mm3               \n\t"/* 4     ; a1=sum(even1) a0=sum(even0)*/\

  305.   "pmaddwd 24+" #A3 ",%%mm1            \n\t"/* x6*w15+x4*w14 x6*w11+x4*w10*/\

  306.   "movq %%mm3,%%mm4                \n\t"/* 4     ; a1 a0*/\

  307.   "pmaddwd 48+" #A3 ",%%mm2            \n\t"/* x3*w29+x1*w28 x3*w25+x1*w24*/\

  308.   "paddd %%mm7,%%mm6               \n\t"/* 7     ; b1=sum(odd1) b0=sum(odd0)*/\

  309.   "pmaddwd 56+" #A3 ",%%mm5            \n\t"/* x7*w31+x5*w30 x7*w27+x5*w26*/\

  310.   "paddd %%mm6,%%mm3               \n\t"/* a1+b1 a0+b0*/\

  311.   "paddd " #A4 ",%%mm0                 \n\t"/* +%4*/\

  312.   "psrad $11,%%mm3     \n\t"/* y1=a1+b1 y0=a0+b0*/\

  313.   "paddd %%mm1,%%mm0               \n\t"/* 1     ; a3=sum(even3) a2=sum(even2)*/\

  314.   "psubd %%mm6,%%mm4               \n\t"/* 6     ; a1-b1 a0-b0*/\

  315.   "movq %%mm0,%%mm7                \n\t"/* 7     ; a3 a2*/\

  316.   "paddd %%mm5,%%mm2               \n\t"/* 5     ; b3=sum(odd3) b2=sum(odd2)*/\

  317.   "paddd %%mm2,%%mm0               \n\t"/* a3+b3 a2+b2*/\

  318.   "psrad $11,%%mm4     \n\t"/* y6=a1-b1 y7=a0-b0*/\

  319.   "psubd %%mm2,%%mm7               \n\t"/* 2     ; a3-b3 a2-b2*/\

  320.   "psrad $11,%%mm0     \n\t"/* y3=a3+b3 y2=a2+b2*/\

  321.   "psrad $11,%%mm7     \n\t"/* y4=a3-b3 y5=a2-b2*/\

  322.   "packssdw %%mm0,%%mm3            \n\t"/* 0     ; y3 y2 y1 y0*/\

  323.   "packssdw %%mm4,%%mm7            \n\t"/* 4     ; y6 y7 y4 y5*/\

  324.   "movq %%mm3, " #A2 "                  \n\t"/* 3     ; save y3 y2 y1 y0*/\

  325.   "pshufw $0xb1,%%mm7,%%mm7        \n\t"/* y7 y6 y5 y4*/\

  326.   "movq %%mm7,8                +" #A2 "\n\t"/* 7     ; save y7 y6 y5 y4*/\

  327. 

  328. 

  329. //-----------------------------------------------------------------------------

  330. //

  331. // The first stage DCT 8x8 - forward DCTs of columns

  332. //

  333. // The %2puts are multiplied

  334. // for rows 0,4 - on cos_4_16,

  335. // for rows 1,7 - on cos_1_16,

  336. // for rows 2,6 - on cos_2_16,

  337. // for rows 3,5 - on cos_3_16

  338. // and are shifted to the left for rise of accuracy

  339. //

  340. //-----------------------------------------------------------------------------

  341. //

  342. // The 8-point scaled forward DCT algorithm (26a8m)

  343. //

  344. //-----------------------------------------------------------------------------

  345. //

  346. // #define DCT_8_FRW_COL(x, y)

  347. //{

  348. // short t0, t1, t2, t3, t4, t5, t6, t7;

  349. // short tp03, tm03, tp12, tm12, tp65, tm65;

  350. // short tp465, tm465, tp765, tm765;

  351. //

  352. // t0 = LEFT_SHIFT ( x[0] + x[7] );

  353. // t1 = LEFT_SHIFT ( x[1] + x[6] );

  354. // t2 = LEFT_SHIFT ( x[2] + x[5] );

  355. // t3 = LEFT_SHIFT ( x[3] + x[4] );

  356. // t4 = LEFT_SHIFT ( x[3] - x[4] );

  357. // t5 = LEFT_SHIFT ( x[2] - x[5] );

  358. // t6 = LEFT_SHIFT ( x[1] - x[6] );

  359. // t7 = LEFT_SHIFT ( x[0] - x[7] );

  360. //

  361. // tp03 = t0 + t3;

  362. // tm03 = t0 - t3;

  363. // tp12 = t1 + t2;

  364. // tm12 = t1 - t2;

  365. //

  366. // y[0] = tp03 + tp12;

  367. // y[4] = tp03 - tp12;

  368. //

  369. // y[2] = tm03 + tm12 * tg_2_16;

  370. // y[6] = tm03 * tg_2_16 - tm12;

  371. //

  372. // tp65 =(t6 +t5 )*cos_4_16;

  373. // tm65 =(t6 -t5 )*cos_4_16;

  374. //

  375. // tp765 = t7 + tp65;

  376. // tm765 = t7 - tp65;

  377. // tp465 = t4 + tm65;

  378. // tm465 = t4 - tm65;

  379. //

  380. // y[1] = tp765 + tp465 * tg_1_16;

  381. // y[7] = tp765 * tg_1_16 - tp465;

  382. // y[5] = tm765 * tg_3_16 + tm465;

  383. // y[3] = tm765 - tm465 * tg_3_16;

  384. //}

  385. //

  386. //-----------------------------------------------------------------------------

  387. 

  388. //-----------------------------------------------------------------------------

  389. // DCT_8_INV_COL_4  INP,OUT

  390. //-----------------------------------------------------------------------------

  391. 

  392. #define DCT_8_INV_COL(A1,A2)\

  393.   "movq 2*8(%3),%%mm0\n\t"\

  394.   "movq 16*3+" #A1 ",%%mm3\n\t"\

  395.   "movq %%mm0,%%mm1            \n\t"/* tg_3_16*/\

  396.   "movq 16*5+" #A1 ",%%mm5\n\t"\

  397.   "pmulhw %%mm3,%%mm0          \n\t"/* x3*(tg_3_16-1)*/\

  398.   "movq (%3),%%mm4\n\t"\

  399.   "pmulhw %%mm5,%%mm1          \n\t"/* x5*(tg_3_16-1)*/\

  400.   "movq 16*7+" #A1 ",%%mm7\n\t"\

  401.   "movq %%mm4,%%mm2            \n\t"/* tg_1_16*/\

  402.   "movq 16*1+" #A1 ",%%mm6\n\t"\

  403.   "pmulhw %%mm7,%%mm4          \n\t"/* x7*tg_1_16*/\

  404.   "paddsw %%mm3,%%mm0          \n\t"/* x3*tg_3_16*/\

  405.   "pmulhw %%mm6,%%mm2          \n\t"/* x1*tg_1_16*/\

  406.   "paddsw %%mm3,%%mm1          \n\t"/* x3+x5*(tg_3_16-1)*/\

  407.   "psubsw %%mm5,%%mm0          \n\t"/* x3*tg_3_16-x5 = tm35*/\

  408.   "movq 3*8(%3),%%mm3\n\t"\

  409.   "paddsw %%mm5,%%mm1          \n\t"/* x3+x5*tg_3_16 = tp35*/\

  410.   "paddsw %%mm6,%%mm4          \n\t"/* x1+tg_1_16*x7 = tp17*/\

  411.   "psubsw %%mm7,%%mm2          \n\t"/* x1*tg_1_16-x7 = tm17*/\

  412.   "movq %%mm4,%%mm5            \n\t"/* tp17*/\

  413.   "movq %%mm2,%%mm6            \n\t"/* tm17*/\

  414.   "paddsw %%mm1,%%mm5          \n\t"/* tp17+tp35 = b0*/\

  415.   "psubsw %%mm0,%%mm6          \n\t"/* tm17-tm35 = b3*/\

  416.   "psubsw %%mm1,%%mm4          \n\t"/* tp17-tp35 = t1*/\

  417.   "paddsw %%mm0,%%mm2          \n\t"/* tm17+tm35 = t2*/\

  418.   "movq 1*8(%3),%%mm7\n\t"\

  419.   "movq %%mm4,%%mm1            \n\t"/* t1*/\

  420.   "movq %%mm5,3*16         +" #A2 "\n\t"/* save b0*/\

  421.   "paddsw %%mm2,%%mm1          \n\t"/* t1+t2*/\

  422.   "movq %%mm6,5*16         +" #A2 "\n\t"/* save b3*/\

  423.   "psubsw %%mm2,%%mm4          \n\t"/* t1-t2*/\

  424.   "movq 2*16+" #A1 ",%%mm5\n\t"\

  425.   "movq %%mm7,%%mm0            \n\t"/* tg_2_16*/\

  426.   "movq 6*16+" #A1 ",%%mm6\n\t"\

  427.   "pmulhw %%mm5,%%mm0          \n\t"/* x2*tg_2_16*/\

  428.   "pmulhw %%mm6,%%mm7          \n\t"/* x6*tg_2_16*/\

  429.   "pmulhw %%mm3,%%mm1          \n\t"/* ocos_4_16*(t1+t2) = b1/2*/\

  430.   "movq 0*16+" #A1 ",%%mm2\n\t"\

  431.   "pmulhw %%mm3,%%mm4          \n\t"/* ocos_4_16*(t1-t2) = b2/2*/\

  432.   "psubsw %%mm6,%%mm0          \n\t"/* t2*tg_2_16-x6 = tm26*/\

  433.   "movq %%mm2,%%mm3            \n\t"/* x0*/\

  434.   "movq 4*16+" #A1 ",%%mm6\n\t"\

  435.   "paddsw %%mm5,%%mm7          \n\t"/* x2+x6*tg_2_16 = tp26*/\

  436.   "paddsw %%mm6,%%mm2          \n\t"/* x0+x4 = tp04*/\

  437.   "psubsw %%mm6,%%mm3          \n\t"/* x0-x4 = tm04*/\

  438.   "movq %%mm2,%%mm5            \n\t"/* tp04*/\

  439.   "movq %%mm3,%%mm6            \n\t"/* tm04*/\

  440.   "psubsw %%mm7,%%mm2          \n\t"/* tp04-tp26 = a3*/\

  441.   "paddsw %%mm0,%%mm3          \n\t"/* tm04+tm26 = a1*/\

  442.   "paddsw %%mm1,%%mm1          \n\t"/* b1*/\

  443.   "paddsw %%mm4,%%mm4          \n\t"/* b2*/\

  444.   "paddsw %%mm7,%%mm5          \n\t"/* tp04+tp26 = a0*/\

  445.   "psubsw %%mm0,%%mm6          \n\t"/* tm04-tm26 = a2*/\

  446.   "movq %%mm3,%%mm7            \n\t"/* a1*/\

  447.   "movq %%mm6,%%mm0            \n\t"/* a2*/\

  448.   "paddsw %%mm1,%%mm3          \n\t"/* a1+b1*/\

  449.   "paddsw %%mm4,%%mm6          \n\t"/* a2+b2*/\

  450.   "psraw $6,%%mm3 \n\t"/* dst1*/\

  451.   "psubsw %%mm1,%%mm7          \n\t"/* a1-b1*/\

  452.   "psraw $6,%%mm6 \n\t"/* dst2*/\

  453.   "psubsw %%mm4,%%mm0          \n\t"/* a2-b2*/\

  454.   "movq 3*16+" #A2 ",%%mm1         \n\t"/* load b0*/\

  455.   "psraw $6,%%mm7 \n\t"/* dst6*/\

  456.   "movq %%mm5,%%mm4            \n\t"/* a0*/\

  457.   "psraw $6,%%mm0 \n\t"/* dst5*/\

  458.   "movq %%mm3,1*16+" #A2 "\n\t"\

  459.   "paddsw %%mm1,%%mm5          \n\t"/* a0+b0*/\

  460.   "movq %%mm6,2*16+" #A2 "\n\t"\

  461.   "psubsw %%mm1,%%mm4          \n\t"/* a0-b0*/\

  462.   "movq 5*16+" #A2 ",%%mm3         \n\t"/* load b3*/\

  463.   "psraw $6,%%mm5 \n\t"/* dst0*/\

  464.   "movq %%mm2,%%mm6            \n\t"/* a3*/\

  465.   "psraw $6,%%mm4 \n\t"/* dst7*/\

  466.   "movq %%mm0,5*16+" #A2 "\n\t"\

  467.   "paddsw %%mm3,%%mm2          \n\t"/* a3+b3*/\

  468.   "movq %%mm7,6*16+" #A2 "\n\t"\

  469.   "psubsw %%mm3,%%mm6          \n\t"/* a3-b3*/\

  470.   "movq %%mm5,0*16+" #A2 "\n\t"\

  471.   "psraw $6,%%mm2 \n\t"/* dst3*/\

  472.   "movq %%mm4,7*16+" #A2 "\n\t"\

  473.   "psraw $6,%%mm6 \n\t"/* dst4*/\

  474.   "movq %%mm2,3*16+" #A2 "\n\t"\

  475.   "movq %%mm6,4*16+" #A2 "\n\t"

  476. 

  477. //=============================================================================

  478. // Code

  479. //=============================================================================

  480. 

  481. //-----------------------------------------------------------------------------

  482. // void idct_mmx(uint16_t block[64]);

  483. //-----------------------------------------------------------------------------

  484. 

  485. 

  486. void ff_idct_xvid_mmx(short *block){

  487. __asm__ volatile(

  488.             //# Process each row

  489.     DCT_8_INV_ROW_MMX(0*16(%0), 0*16(%0), 64*0(%2), 8*0(%1))

  490.     DCT_8_INV_ROW_MMX(1*16(%0), 1*16(%0), 64*1(%2), 8*1(%1))

  491.     DCT_8_INV_ROW_MMX(2*16(%0), 2*16(%0), 64*2(%2), 8*2(%1))

  492.     DCT_8_INV_ROW_MMX(3*16(%0), 3*16(%0), 64*3(%2), 8*3(%1))

  493.     DCT_8_INV_ROW_MMX(4*16(%0), 4*16(%0), 64*0(%2), 8*4(%1))

  494.     DCT_8_INV_ROW_MMX(5*16(%0), 5*16(%0), 64*3(%2), 8*5(%1))

  495.     DCT_8_INV_ROW_MMX(6*16(%0), 6*16(%0), 64*2(%2), 8*6(%1))

  496.     DCT_8_INV_ROW_MMX(7*16(%0), 7*16(%0), 64*1(%2), 8*7(%1))

  497. 

  498.             //# Process the columns (4 at a time)

  499.     DCT_8_INV_COL(0(%0), 0(%0))

  500.     DCT_8_INV_COL(8(%0), 8(%0))

  501.     :: "r"(block), "r"(rounder_0), "r"(tab_i_04_mmx), "r"(tg_1_16));

  502. }

  503. 

  504. //-----------------------------------------------------------------------------

  505. // void idct_xmm(uint16_t block[64]);

  506. //-----------------------------------------------------------------------------

  507. 

  508. 

  509. void ff_idct_xvid_mmx2(short *block){

  510. __asm__ volatile(

  511.             //# Process each row

  512.     DCT_8_INV_ROW_XMM(0*16(%0), 0*16(%0), 64*0(%2), 8*0(%1))

  513.     DCT_8_INV_ROW_XMM(1*16(%0), 1*16(%0), 64*1(%2), 8*1(%1))

  514.     DCT_8_INV_ROW_XMM(2*16(%0), 2*16(%0), 64*2(%2), 8*2(%1))

  515.     DCT_8_INV_ROW_XMM(3*16(%0), 3*16(%0), 64*3(%2), 8*3(%1))

  516.     DCT_8_INV_ROW_XMM(4*16(%0), 4*16(%0), 64*0(%2), 8*4(%1))

  517.     DCT_8_INV_ROW_XMM(5*16(%0), 5*16(%0), 64*3(%2), 8*5(%1))

  518.     DCT_8_INV_ROW_XMM(6*16(%0), 6*16(%0), 64*2(%2), 8*6(%1))

  519.     DCT_8_INV_ROW_XMM(7*16(%0), 7*16(%0), 64*1(%2), 8*7(%1))

  520. 

  521.             //# Process the columns (4 at a time)

  522.     DCT_8_INV_COL(0(%0), 0(%0))

  523.     DCT_8_INV_COL(8(%0), 8(%0))

  524.     :: "r"(block), "r"(rounder_0), "r"(tab_i_04_xmm), "r"(tg_1_16));

  525. }