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FFmpeg/libavcodec/x86/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 "libavcodec/dsputil.h"

  42. #include "idct_xvid.h"

  43. #include "dsputil_mmx.h"

  44. 

  45. /*!

  46.  * @file

  47.  * @brief SSE2 idct compatible with xvidmmx

  48.  */

  49. 

  50. #define X8(x)     x,x,x,x,x,x,x,x

  51. 

  52. #define ROW_SHIFT 11

  53. #define COL_SHIFT 6

  54. 

  55. DECLARE_ASM_CONST(16, int16_t, tan1)[] = {X8(13036)}; // tan( pi/16)

  56. DECLARE_ASM_CONST(16, int16_t, tan2)[] = {X8(27146)}; // tan(2pi/16) = sqrt(2)-1

  57. DECLARE_ASM_CONST(16, int16_t, tan3)[] = {X8(43790)}; // tan(3pi/16)-1

  58. DECLARE_ASM_CONST(16, int16_t, sqrt2)[]= {X8(23170)}; // 0.5/sqrt(2)

  59. DECLARE_ASM_CONST(8,  uint8_t, m127)[] = {X8(127)};

  60. 

  61. DECLARE_ASM_CONST(16, int16_t, iTab1)[] = {

  62.  0x4000, 0x539f, 0xc000, 0xac61, 0x4000, 0xdd5d, 0x4000, 0xdd5d,

  63.  0x4000, 0x22a3, 0x4000, 0x22a3, 0xc000, 0x539f, 0x4000, 0xac61,

  64.  0x3249, 0x11a8, 0x4b42, 0xee58, 0x11a8, 0x4b42, 0x11a8, 0xcdb7,

  65.  0x58c5, 0x4b42, 0xa73b, 0xcdb7, 0x3249, 0xa73b, 0x4b42, 0xa73b

  66. };

  67. 

  68. DECLARE_ASM_CONST(16, int16_t, iTab2)[] = {

  69.  0x58c5, 0x73fc, 0xa73b, 0x8c04, 0x58c5, 0xcff5, 0x58c5, 0xcff5,

  70.  0x58c5, 0x300b, 0x58c5, 0x300b, 0xa73b, 0x73fc, 0x58c5, 0x8c04,

  71.  0x45bf, 0x187e, 0x6862, 0xe782, 0x187e, 0x6862, 0x187e, 0xba41,

  72.  0x7b21, 0x6862, 0x84df, 0xba41, 0x45bf, 0x84df, 0x6862, 0x84df

  73. };

  74. 

  75. DECLARE_ASM_CONST(16, int16_t, iTab3)[] = {

  76.  0x539f, 0x6d41, 0xac61, 0x92bf, 0x539f, 0xd2bf, 0x539f, 0xd2bf,

  77.  0x539f, 0x2d41, 0x539f, 0x2d41, 0xac61, 0x6d41, 0x539f, 0x92bf,

  78.  0x41b3, 0x1712, 0x6254, 0xe8ee, 0x1712, 0x6254, 0x1712, 0xbe4d,

  79.  0x73fc, 0x6254, 0x8c04, 0xbe4d, 0x41b3, 0x8c04, 0x6254, 0x8c04

  80. };

  81. 

  82. DECLARE_ASM_CONST(16, int16_t, iTab4)[] = {

  83.  0x4b42, 0x6254, 0xb4be, 0x9dac, 0x4b42, 0xd746, 0x4b42, 0xd746,

  84.  0x4b42, 0x28ba, 0x4b42, 0x28ba, 0xb4be, 0x6254, 0x4b42, 0x9dac,

  85.  0x3b21, 0x14c3, 0x587e, 0xeb3d, 0x14c3, 0x587e, 0x14c3, 0xc4df,

  86.  0x6862, 0x587e, 0x979e, 0xc4df, 0x3b21, 0x979e, 0x587e, 0x979e

  87. };

  88. 

  89. DECLARE_ASM_CONST(16, int32_t, walkenIdctRounders)[] = {

  90.  65536, 65536, 65536, 65536,

  91.   3597,  3597,  3597,  3597,

  92.   2260,  2260,  2260,  2260,

  93.   1203,  1203,  1203,  1203,

  94.    120,   120,   120,   120,

  95.    512,   512,   512,   512

  96. };

  97. 

  98. // Temporary storage before the column pass

  99. #define ROW1 "%%xmm6"

  100. #define ROW3 "%%xmm4"

  101. #define ROW5 "%%xmm5"

  102. #define ROW7 "%%xmm7"

  103. 

  104. #define CLEAR_ODD(r) "pxor  "r","r" \n\t"

  105. #define PUT_ODD(dst) "pshufhw  $0x1B, %%xmm2, "dst"   \n\t"

  106. 

  107. #if ARCH_X86_64

  108. 

  109. # define ROW0 "%%xmm8"

  110. # define REG0 ROW0

  111. # define ROW2 "%%xmm9"

  112. # define REG2 ROW2

  113. # define ROW4 "%%xmm10"

  114. # define REG4 ROW4

  115. # define ROW6 "%%xmm11"

  116. # define REG6 ROW6

  117. # define CLEAR_EVEN(r) CLEAR_ODD(r)

  118. # define PUT_EVEN(dst) PUT_ODD(dst)

  119. # define XMMS "%%xmm12"

  120. # define MOV_32_ONLY "#"

  121. # define SREG2 REG2

  122. # define TAN3 "%%xmm13"

  123. # define TAN1 "%%xmm14"

  124. 

  125. #else

  126. 

  127. # define ROW0 "(%0)"

  128. # define REG0 "%%xmm4"

  129. # define ROW2 "2*16(%0)"

  130. # define REG2 "%%xmm4"

  131. # define ROW4 "4*16(%0)"

  132. # define REG4 "%%xmm6"

  133. # define ROW6 "6*16(%0)"

  134. # define REG6 "%%xmm6"

  135. # define CLEAR_EVEN(r)

  136. # define PUT_EVEN(dst) \

  137.     "pshufhw  $0x1B, %%xmm2, %%xmm2   \n\t" \

  138.     "movdqa          %%xmm2, "dst"    \n\t"

  139. # define XMMS "%%xmm2"

  140. # define MOV_32_ONLY "movdqa "

  141. # define SREG2 "%%xmm7"

  142. # define TAN3 "%%xmm0"

  143. # define TAN1 "%%xmm2"

  144. 

  145. #endif

  146. 

  147. #define ROUND(x) "paddd   "MANGLE(x)

  148. 

  149. #define JZ(reg, to)                         \

  150.     "testl     "reg","reg"            \n\t" \

  151.     "jz        "to"                   \n\t"

  152. 

  153. #define JNZ(reg, to)                        \

  154.     "testl     "reg","reg"            \n\t" \

  155.     "jnz       "to"                   \n\t"

  156. 

  157. #define TEST_ONE_ROW(src, reg, clear)       \

  158.     clear                                   \

  159.     "movq     "src", %%mm1            \n\t" \

  160.     "por    8+"src", %%mm1            \n\t" \

  161.     "paddusb  %%mm0, %%mm1            \n\t" \

  162.     "pmovmskb %%mm1, "reg"            \n\t"

  163. 

  164. #define TEST_TWO_ROWS(row1, row2, reg1, reg2, clear1, clear2) \

  165.     clear1                                  \

  166.     clear2                                  \

  167.     "movq     "row1", %%mm1           \n\t" \

  168.     "por    8+"row1", %%mm1           \n\t" \

  169.     "movq     "row2", %%mm2           \n\t" \

  170.     "por    8+"row2", %%mm2           \n\t" \

  171.     "paddusb   %%mm0, %%mm1           \n\t" \

  172.     "paddusb   %%mm0, %%mm2           \n\t" \

  173.     "pmovmskb  %%mm1, "reg1"          \n\t" \

  174.     "pmovmskb  %%mm2, "reg2"          \n\t"

  175. 

  176. ///IDCT pass on rows.

  177. #define iMTX_MULT(src, table, rounder, put) \

  178.     "movdqa        "src", %%xmm3      \n\t" \

  179.     "movdqa       %%xmm3, %%xmm0      \n\t" \

  180.     "pshufd   $0x11, %%xmm3, %%xmm1   \n\t" /* 4602 */ \

  181.     "punpcklqdq   %%xmm0, %%xmm0      \n\t" /* 0246 */ \

  182.     "pmaddwd     "table", %%xmm0      \n\t" \

  183.     "pmaddwd  16+"table", %%xmm1      \n\t" \

  184.     "pshufd   $0xBB, %%xmm3, %%xmm2   \n\t" /* 5713 */ \

  185.     "punpckhqdq   %%xmm3, %%xmm3      \n\t" /* 1357 */ \

  186.     "pmaddwd  32+"table", %%xmm2      \n\t" \

  187.     "pmaddwd  48+"table", %%xmm3      \n\t" \

  188.     "paddd        %%xmm1, %%xmm0      \n\t" \

  189.     "paddd        %%xmm3, %%xmm2      \n\t" \

  190.     rounder",     %%xmm0              \n\t" \

  191.     "movdqa       %%xmm2, %%xmm3      \n\t" \

  192.     "paddd        %%xmm0, %%xmm2      \n\t" \

  193.     "psubd        %%xmm3, %%xmm0      \n\t" \

  194.     "psrad           $11, %%xmm2      \n\t" \

  195.     "psrad           $11, %%xmm0      \n\t" \

  196.     "packssdw     %%xmm0, %%xmm2      \n\t" \

  197.     put                                     \

  198.     "1:                               \n\t"

  199. 

  200. #define iLLM_HEAD                           \

  201.     "movdqa   "MANGLE(tan3)", "TAN3"  \n\t" \

  202.     "movdqa   "MANGLE(tan1)", "TAN1"  \n\t" \

  203. 

  204. ///IDCT pass on columns.

  205. #define iLLM_PASS(dct)                      \

  206.     "movdqa   "TAN3", %%xmm1          \n\t" \

  207.     "movdqa   "TAN1", %%xmm3          \n\t" \

  208.     "pmulhw   %%xmm4, "TAN3"          \n\t" \

  209.     "pmulhw   %%xmm5, %%xmm1          \n\t" \

  210.     "paddsw   %%xmm4, "TAN3"          \n\t" \

  211.     "paddsw   %%xmm5, %%xmm1          \n\t" \

  212.     "psubsw   %%xmm5, "TAN3"          \n\t" \

  213.     "paddsw   %%xmm4, %%xmm1          \n\t" \

  214.     "pmulhw   %%xmm7, %%xmm3          \n\t" \

  215.     "pmulhw   %%xmm6, "TAN1"          \n\t" \

  216.     "paddsw   %%xmm6, %%xmm3          \n\t" \

  217.     "psubsw   %%xmm7, "TAN1"          \n\t" \

  218.     "movdqa   %%xmm3, %%xmm7          \n\t" \

  219.     "movdqa   "TAN1", %%xmm6          \n\t" \

  220.     "psubsw   %%xmm1, %%xmm3          \n\t" \

  221.     "psubsw   "TAN3", "TAN1"          \n\t" \

  222.     "paddsw   %%xmm7, %%xmm1          \n\t" \

  223.     "paddsw   %%xmm6, "TAN3"          \n\t" \

  224.     "movdqa   %%xmm3, %%xmm6          \n\t" \

  225.     "psubsw   "TAN3", %%xmm3          \n\t" \

  226.     "paddsw   %%xmm6, "TAN3"          \n\t" \

  227.     "movdqa   "MANGLE(sqrt2)", %%xmm4 \n\t" \

  228.     "pmulhw   %%xmm4, %%xmm3          \n\t" \

  229.     "pmulhw   %%xmm4, "TAN3"          \n\t" \

  230.     "paddsw   "TAN3", "TAN3"          \n\t" \

  231.     "paddsw   %%xmm3, %%xmm3          \n\t" \

  232.     "movdqa   "MANGLE(tan2)", %%xmm7  \n\t" \

  233.     MOV_32_ONLY ROW2", "REG2"         \n\t" \

  234.     MOV_32_ONLY ROW6", "REG6"         \n\t" \

  235.     "movdqa   %%xmm7, %%xmm5          \n\t" \

  236.     "pmulhw   "REG6", %%xmm7          \n\t" \

  237.     "pmulhw   "REG2", %%xmm5          \n\t" \

  238.     "paddsw   "REG2", %%xmm7          \n\t" \

  239.     "psubsw   "REG6", %%xmm5          \n\t" \

  240.     MOV_32_ONLY ROW0", "REG0"         \n\t" \

  241.     MOV_32_ONLY ROW4", "REG4"         \n\t" \

  242.     MOV_32_ONLY"  "TAN1", (%0)        \n\t" \

  243.     "movdqa   "REG0", "XMMS"          \n\t" \

  244.     "psubsw   "REG4", "REG0"          \n\t" \

  245.     "paddsw   "XMMS", "REG4"          \n\t" \

  246.     "movdqa   "REG4", "XMMS"          \n\t" \

  247.     "psubsw   %%xmm7, "REG4"          \n\t" \

  248.     "paddsw   "XMMS", %%xmm7          \n\t" \

  249.     "movdqa   "REG0", "XMMS"          \n\t" \

  250.     "psubsw   %%xmm5, "REG0"          \n\t" \

  251.     "paddsw   "XMMS", %%xmm5          \n\t" \

  252.     "movdqa   %%xmm5, "XMMS"          \n\t" \

  253.     "psubsw   "TAN3", %%xmm5          \n\t" \

  254.     "paddsw   "XMMS", "TAN3"          \n\t" \

  255.     "movdqa   "REG0", "XMMS"          \n\t" \

  256.     "psubsw   %%xmm3, "REG0"          \n\t" \

  257.     "paddsw   "XMMS", %%xmm3          \n\t" \

  258.     MOV_32_ONLY"  (%0), "TAN1"        \n\t" \

  259.     "psraw        $6, %%xmm5          \n\t" \

  260.     "psraw        $6, "REG0"          \n\t" \

  261.     "psraw        $6, "TAN3"          \n\t" \

  262.     "psraw        $6, %%xmm3          \n\t" \

  263.     "movdqa   "TAN3", 1*16("dct")     \n\t" \

  264.     "movdqa   %%xmm3, 2*16("dct")     \n\t" \

  265.     "movdqa   "REG0", 5*16("dct")     \n\t" \

  266.     "movdqa   %%xmm5, 6*16("dct")     \n\t" \

  267.     "movdqa   %%xmm7, %%xmm0          \n\t" \

  268.     "movdqa   "REG4", %%xmm4          \n\t" \

  269.     "psubsw   %%xmm1, %%xmm7          \n\t" \

  270.     "psubsw   "TAN1", "REG4"          \n\t" \

  271.     "paddsw   %%xmm0, %%xmm1          \n\t" \

  272.     "paddsw   %%xmm4, "TAN1"          \n\t" \

  273.     "psraw        $6, %%xmm1          \n\t" \

  274.     "psraw        $6, %%xmm7          \n\t" \

  275.     "psraw        $6, "TAN1"          \n\t" \

  276.     "psraw        $6, "REG4"          \n\t" \

  277.     "movdqa   %%xmm1, ("dct")         \n\t" \

  278.     "movdqa   "TAN1", 3*16("dct")     \n\t" \

  279.     "movdqa   "REG4", 4*16("dct")     \n\t" \

  280.     "movdqa   %%xmm7, 7*16("dct")     \n\t"

  281. 

  282. ///IDCT pass on columns, assuming rows 4-7 are zero.

  283. #define iLLM_PASS_SPARSE(dct)               \

  284.     "pmulhw   %%xmm4, "TAN3"          \n\t" \

  285.     "paddsw   %%xmm4, "TAN3"          \n\t" \

  286.     "movdqa   %%xmm6, %%xmm3          \n\t" \

  287.     "pmulhw   %%xmm6, "TAN1"          \n\t" \

  288.     "movdqa   %%xmm4, %%xmm1          \n\t" \

  289.     "psubsw   %%xmm1, %%xmm3          \n\t" \

  290.     "paddsw   %%xmm6, %%xmm1          \n\t" \

  291.     "movdqa   "TAN1", %%xmm6          \n\t" \

  292.     "psubsw   "TAN3", "TAN1"          \n\t" \

  293.     "paddsw   %%xmm6, "TAN3"          \n\t" \

  294.     "movdqa   %%xmm3, %%xmm6          \n\t" \

  295.     "psubsw   "TAN3", %%xmm3          \n\t" \

  296.     "paddsw   %%xmm6, "TAN3"          \n\t" \

  297.     "movdqa   "MANGLE(sqrt2)", %%xmm4 \n\t" \

  298.     "pmulhw   %%xmm4, %%xmm3          \n\t" \

  299.     "pmulhw   %%xmm4, "TAN3"          \n\t" \

  300.     "paddsw   "TAN3", "TAN3"          \n\t" \

  301.     "paddsw   %%xmm3, %%xmm3          \n\t" \

  302.     "movdqa   "MANGLE(tan2)", %%xmm5  \n\t" \

  303.     MOV_32_ONLY ROW2", "SREG2"        \n\t" \

  304.     "pmulhw   "SREG2", %%xmm5         \n\t" \

  305.     MOV_32_ONLY ROW0", "REG0"         \n\t" \

  306.     "movdqa   "REG0", %%xmm6          \n\t" \

  307.     "psubsw   "SREG2", %%xmm6         \n\t" \

  308.     "paddsw   "REG0", "SREG2"         \n\t" \

  309.     MOV_32_ONLY"  "TAN1", (%0)        \n\t" \

  310.     "movdqa   "REG0", "XMMS"          \n\t" \

  311.     "psubsw   %%xmm5, "REG0"          \n\t" \

  312.     "paddsw   "XMMS", %%xmm5          \n\t" \

  313.     "movdqa   %%xmm5, "XMMS"          \n\t" \

  314.     "psubsw   "TAN3", %%xmm5          \n\t" \

  315.     "paddsw   "XMMS", "TAN3"          \n\t" \

  316.     "movdqa   "REG0", "XMMS"          \n\t" \

  317.     "psubsw   %%xmm3, "REG0"          \n\t" \

  318.     "paddsw   "XMMS", %%xmm3          \n\t" \

  319.     MOV_32_ONLY"  (%0), "TAN1"        \n\t" \

  320.     "psraw        $6, %%xmm5          \n\t" \

  321.     "psraw        $6, "REG0"          \n\t" \

  322.     "psraw        $6, "TAN3"          \n\t" \

  323.     "psraw        $6, %%xmm3          \n\t" \

  324.     "movdqa   "TAN3", 1*16("dct")     \n\t" \

  325.     "movdqa   %%xmm3, 2*16("dct")     \n\t" \

  326.     "movdqa   "REG0", 5*16("dct")     \n\t" \

  327.     "movdqa   %%xmm5, 6*16("dct")     \n\t" \

  328.     "movdqa   "SREG2", %%xmm0         \n\t" \

  329.     "movdqa   %%xmm6, %%xmm4          \n\t" \

  330.     "psubsw   %%xmm1, "SREG2"         \n\t" \

  331.     "psubsw   "TAN1", %%xmm6          \n\t" \

  332.     "paddsw   %%xmm0, %%xmm1          \n\t" \

  333.     "paddsw   %%xmm4, "TAN1"          \n\t" \

  334.     "psraw        $6, %%xmm1          \n\t" \

  335.     "psraw        $6, "SREG2"         \n\t" \

  336.     "psraw        $6, "TAN1"          \n\t" \

  337.     "psraw        $6, %%xmm6          \n\t" \

  338.     "movdqa   %%xmm1, ("dct")         \n\t" \

  339.     "movdqa   "TAN1", 3*16("dct")     \n\t" \

  340.     "movdqa   %%xmm6, 4*16("dct")     \n\t" \

  341.     "movdqa   "SREG2", 7*16("dct")    \n\t"

  342. 

  343. inline void ff_idct_xvid_sse2(short *block)

  344. {

  345.     __asm__ volatile(

  346.     "movq     "MANGLE(m127)", %%mm0                              \n\t"

  347.     iMTX_MULT("(%0)",     MANGLE(iTab1), ROUND(walkenIdctRounders),      PUT_EVEN(ROW0))

  348.     iMTX_MULT("1*16(%0)", MANGLE(iTab2), ROUND(walkenIdctRounders+1*16), PUT_ODD(ROW1))

  349.     iMTX_MULT("2*16(%0)", MANGLE(iTab3), ROUND(walkenIdctRounders+2*16), PUT_EVEN(ROW2))

  350. 

  351.     TEST_TWO_ROWS("3*16(%0)", "4*16(%0)", "%%eax", "%%ecx", CLEAR_ODD(ROW3), CLEAR_EVEN(ROW4))

  352.     JZ("%%eax", "1f")

  353.     iMTX_MULT("3*16(%0)", MANGLE(iTab4), ROUND(walkenIdctRounders+3*16), PUT_ODD(ROW3))

  354. 

  355.     TEST_TWO_ROWS("5*16(%0)", "6*16(%0)", "%%eax", "%%edx", CLEAR_ODD(ROW5), CLEAR_EVEN(ROW6))

  356.     TEST_ONE_ROW("7*16(%0)", "%%esi", CLEAR_ODD(ROW7))

  357.     iLLM_HEAD

  358.     ASMALIGN(4)

  359.     JNZ("%%ecx", "2f")

  360.     JNZ("%%eax", "3f")

  361.     JNZ("%%edx", "4f")

  362.     JNZ("%%esi", "5f")

  363.     iLLM_PASS_SPARSE("%0")

  364.     "jmp 6f                                                      \n\t"

  365.     "2:                                                          \n\t"

  366.     iMTX_MULT("4*16(%0)", MANGLE(iTab1), "#", PUT_EVEN(ROW4))

  367.     "3:                                                          \n\t"

  368.     iMTX_MULT("5*16(%0)", MANGLE(iTab4), ROUND(walkenIdctRounders+4*16), PUT_ODD(ROW5))

  369.     JZ("%%edx", "1f")

  370.     "4:                                                          \n\t"

  371.     iMTX_MULT("6*16(%0)", MANGLE(iTab3), ROUND(walkenIdctRounders+5*16), PUT_EVEN(ROW6))

  372.     JZ("%%esi", "1f")

  373.     "5:                                                          \n\t"

  374.     iMTX_MULT("7*16(%0)", MANGLE(iTab2), ROUND(walkenIdctRounders+5*16), PUT_ODD(ROW7))

  375. #if !ARCH_X86_64

  376.     iLLM_HEAD

  377. #endif

  378.     iLLM_PASS("%0")

  379.     "6:                                                          \n\t"

  380.     : "+r"(block)

  381.     :

  382.     : "%eax", "%ecx", "%edx", "%esi", "memory");

  383. }

  384. 

  385. void ff_idct_xvid_sse2_put(uint8_t *dest, int line_size, short *block)

  386. {

  387.     ff_idct_xvid_sse2(block);

  388.     put_pixels_clamped_mmx(block, dest, line_size);

  389. }

  390. 

  391. void ff_idct_xvid_sse2_add(uint8_t *dest, int line_size, short *block)

  392. {

  393.     ff_idct_xvid_sse2(block);

  394.     add_pixels_clamped_mmx(block, dest, line_size);

  395. }