?? idct_mmx.c
字號(hào):
/*
;
; MMX iDCT
;
; Originally provided by Intel at AP-922
; http://developer.intel.com/vtune/cbts/strmsimd/922down.htm
; (See more app notes at http://developer.intel.com/vtune/cbts/strmsimd/appnotes.htm)
; but in a limited edition.
; New macro implements a column part for precise iDCT
; The routine precision now satisfies IEEE standard 1180-1990.
;
; Copyright (c) 2000-2001 Peter Gubanov <peter@elecard.net.ru>
; Rounding trick Copyright (c) 2000 Michel Lespinasse <walken@zoy.org>
;
; http://www.elecard.com/peter/idct.html
; http://www.linuxvideo.org/mpeg2dec/
;
; Conversion to MS-style inline C format (c) 2001 DivX Networks Inc. John Funnell
;
; Version v1.0.0 10 January 2001
;
*/
/*
if you are not setting the name of you MMX idct function with compile flag MMX_IDCT_NAME,
then you need to choose a name to insert in here:
*/
#define DEFAULT_FUNCTION_NAME idct
#ifndef MMX_IDCT_NAME
#define MMX_IDCT_NAME DEFAULT_FUNCTION_NAME
#endif
/* some types */
#define int16_t short
#define int32_t int
#define uint64_t unsigned __int64
#define MPTR qword ptr
/* some conversions from readable integer constants to qwords */
#define SHORT4_TO_QWORD(A, B, C, D) ( \
( ( ((uint64_t)(A)) & ((uint64_t)(0xffff)) ) << 0 ) | \
( ( ((uint64_t)(B)) & ((uint64_t)(0xffff)) ) << 16 ) | \
( ( ((uint64_t)(C)) & ((uint64_t)(0xffff)) ) << 32 ) | \
( ( ((uint64_t)(D)) & ((uint64_t)(0xffff)) ) << 48 ) )
#define INT2_TO_QWORD(A, B) ( \
( ( ((uint64_t)(A)) & ((uint64_t)(0xffffffff)) ) << 0 ) | \
( ( ((uint64_t)(B)) & ((uint64_t)(0xffffffff)) ) << 32 ) )
#define BITS_INV_ACC 5 /* 4 or 5 for IEEE */
#define SHIFT_INV_ROW (16 - BITS_INV_ACC)
#define SHIFT_INV_COL (1 + BITS_INV_ACC)
#define RND_INV_ROW (1024 * (6 - BITS_INV_ACC)) /* 1 << (SHIFT_INV_ROW-1) */
#define RND_INV_COL (16 * (BITS_INV_ACC - 3)) /* 1 << (SHIFT_INV_COL-1) */
#define RND_INV_CORR (RND_INV_COL - 1) /* correction -1.0 and round */
#define BITS_FRW_ACC 3 /* 2 or 3 for accuracy */
#define SHIFT_FRW_COL BITS_FRW_ACC
#define SHIFT_FRW_ROW (BITS_FRW_ACC + 17)
#define RND_FRW_ROW (262144 * (BITS_FRW_ACC - 1)) /* 1 << (SHIFT_FRW_ROW-1) */
const uint64_t tg_1_16 = SHORT4_TO_QWORD( 13036, 13036, 13036, 13036 );
const uint64_t tg_2_16 = SHORT4_TO_QWORD( 27146, 27146, 27146, 27146 );
const uint64_t tg_3_16 = SHORT4_TO_QWORD(-21746, -21746, -21746, -21746 );
const uint64_t ocos_4_16 = SHORT4_TO_QWORD( 23170, 23170, 23170, 23170 );
/* rounding value that is added before the row transform's rounding */
#if SHIFT_INV_ROW == 12
const uint64_t rounder[8] = {
INT2_TO_QWORD( 65536, 65536), /* rounder_0 */
INT2_TO_QWORD( 7195, 7195), /* rounder_1 */
INT2_TO_QWORD( 4520, 4520), /* rounder_2 */
INT2_TO_QWORD( 2407, 2407), /* rounder_3 */
INT2_TO_QWORD( 0, 0), /* rounder_4 */
INT2_TO_QWORD( 240, 240), /* rounder_5 */
INT2_TO_QWORD( 1024, 1024), /* rounder_6 */
INT2_TO_QWORD( 1024, 1024) /* rounder_7 */
};
#elif SHIFT_INV_ROW == 11
const uint64_t rounder[2*8] = {
INT2_TO_QWORD( 65536, 65536), /* rounder_0 */
INT2_TO_QWORD( 3597, 3597), /* rounder_1 */
INT2_TO_QWORD( 2260, 2260), /* rounder_2 */
INT2_TO_QWORD( 1203, 1203), /* rounder_3 */
INT2_TO_QWORD( 0, 0), /* rounder_4 */
INT2_TO_QWORD( 120, 120), /* rounder_5 */
INT2_TO_QWORD( 512, 512), /* rounder_6 */
INT2_TO_QWORD( 512, 512) /* rounder_7 */
};
#endif
/*
;=============================================================================
;
; The first stage iDCT 8x8 - inverse DCTs of rows
;
;-----------------------------------------------------------------------------
; The 8-point inverse DCT direct algorithm
;-----------------------------------------------------------------------------
;
; static const short w[32] = {
; FIX(cos_4_16), FIX(cos_2_16), FIX(cos_4_16), FIX(cos_6_16),
; FIX(cos_4_16), FIX(cos_6_16), -FIX(cos_4_16), -FIX(cos_2_16),
; FIX(cos_4_16), -FIX(cos_6_16), -FIX(cos_4_16), FIX(cos_2_16),
; FIX(cos_4_16), -FIX(cos_2_16), FIX(cos_4_16), -FIX(cos_6_16),
; FIX(cos_1_16), FIX(cos_3_16), FIX(cos_5_16), FIX(cos_7_16),
; FIX(cos_3_16), -FIX(cos_7_16), -FIX(cos_1_16), -FIX(cos_5_16),
; FIX(cos_5_16), -FIX(cos_1_16), FIX(cos_7_16), FIX(cos_3_16),
; FIX(cos_7_16), -FIX(cos_5_16), FIX(cos_3_16), -FIX(cos_1_16) };
;
; #define DCT_8_INV_ROW(x, y)
;{
; int a0, a1, a2, a3, b0, b1, b2, b3;
;
; a0 =x[0]*w[0]+x[2]*w[1]+x[4]*w[2]+x[6]*w[3];
; a1 =x[0]*w[4]+x[2]*w[5]+x[4]*w[6]+x[6]*w[7];
; a2 = x[0] * w[ 8] + x[2] * w[ 9] + x[4] * w[10] + x[6] * w[11];
; a3 = x[0] * w[12] + x[2] * w[13] + x[4] * w[14] + x[6] * w[15];
; b0 = x[1] * w[16] + x[3] * w[17] + x[5] * w[18] + x[7] * w[19];
; b1 = x[1] * w[20] + x[3] * w[21] + x[5] * w[22] + x[7] * w[23];
; b2 = x[1] * w[24] + x[3] * w[25] + x[5] * w[26] + x[7] * w[27];
; b3 = x[1] * w[28] + x[3] * w[29] + x[5] * w[30] + x[7] * w[31];
;
; y[0] = SHIFT_ROUND ( a0 + b0 );
; y[1] = SHIFT_ROUND ( a1 + b1 );
; y[2] = SHIFT_ROUND ( a2 + b2 );
; y[3] = SHIFT_ROUND ( a3 + b3 );
; y[4] = SHIFT_ROUND ( a3 - b3 );
; y[5] = SHIFT_ROUND ( a2 - b2 );
; y[6] = SHIFT_ROUND ( a1 - b1 );
; y[7] = SHIFT_ROUND ( a0 - b0 );
;}
;
;-----------------------------------------------------------------------------
;
; In this implementation the outputs of the iDCT-1D are multiplied
; for rows 0,4 - by cos_4_16,
; for rows 1,7 - by cos_1_16,
; for rows 2,6 - by cos_2_16,
; for rows 3,5 - by cos_3_16
; and are shifted to the left for better accuracy
;
; For the constants used,
; FIX(float_const) = (short) (float_const * (1<<15) + 0.5)
;
;=============================================================================
*/
/*
;=============================================================================
; code for MMX
;=============================================================================
; Table for rows 0,4 - constants are multiplied by cos_4_16
*/
const uint64_t tab_i_04[8*8] = {
/* Table for rows 0,4 - constants are multiplied by cos_4_16 */
SHORT4_TO_QWORD( 16384, 16384, 16384, -16384 ), /* movq-> w06 w04 w02 w00 */
SHORT4_TO_QWORD( 21407, 8867, 8867, -21407 ), /* w07 w05 w03 w01 */
SHORT4_TO_QWORD( 16384, -16384, 16384, 16384 ), /* w14 w12 w10 w08 */
SHORT4_TO_QWORD( -8867, 21407, -21407, -8867 ), /* w15 w13 w11 w09 */
SHORT4_TO_QWORD( 22725, 12873, 19266, -22725 ), /* w22 w20 w18 w16 */
SHORT4_TO_QWORD( 19266, 4520, -4520, -12873 ), /* w23 w21 w19 w17 */
SHORT4_TO_QWORD( 12873, 4520, 4520, 19266 ), /* w30 w28 w26 w24 */
SHORT4_TO_QWORD(-22725, 19266, -12873, -22725 ), /* w31 w29 w27 w25 */
/* Table for rows 1,7 - constants are multiplied by cos_1_16 */
SHORT4_TO_QWORD( 22725, 22725, 22725, -22725 ), /* movq-> w06 w04 w02 w00 */
SHORT4_TO_QWORD( 29692, 12299, 12299, -29692 ), /* w07 w05 w03 w01 */
SHORT4_TO_QWORD( 22725, -22725, 22725, 22725 ), /* w14 w12 w10 w08 */
SHORT4_TO_QWORD(-12299, 29692, -29692, -12299 ), /* w15 w13 w11 w09 */
SHORT4_TO_QWORD( 31521, 17855, 26722, -31521 ), /* w22 w20 w18 w16 */
SHORT4_TO_QWORD( 26722, 6270, -6270, -17855 ), /* w23 w21 w19 w17 */
SHORT4_TO_QWORD( 17855, 6270, 6270, 26722 ), /* w30 w28 w26 w24 */
SHORT4_TO_QWORD(-31521, 26722, -17855, -31521 ), /* w31 w29 w27 w25 */
/* Table for rows 2,6 - constants are multiplied by cos_2_16 */
SHORT4_TO_QWORD( 21407, 21407, 21407, -21407 ), /* movq-> w06 w04 w02 w00 */
SHORT4_TO_QWORD( 27969, 11585, 11585, -27969 ), /* w07 w05 w03 w01 */
SHORT4_TO_QWORD( 21407, -21407, 21407, 21407 ), /* w14 w12 w10 w08 */
SHORT4_TO_QWORD(-11585, 27969, -27969, -11585 ), /* w15 w13 w11 w09 */
SHORT4_TO_QWORD( 29692, 16819, 25172, -29692 ), /* w22 w20 w18 w16 */
SHORT4_TO_QWORD( 25172, 5906, -5906, -16819 ), /* w23 w21 w19 w17 */
SHORT4_TO_QWORD( 16819, 5906, 5906, 25172 ), /* w30 w28 w26 w24 */
SHORT4_TO_QWORD(-29692, 25172, -16819, -29692 ), /* w31 w29 w27 w25 */
/* Table for rows 3,5 - constants are multiplied by cos_3_16 */
SHORT4_TO_QWORD( 19266, 19266, 19266, -19266 ), /* movq-> w06 w04 w02 w00 */
SHORT4_TO_QWORD( 25172, 10426, 10426, -25172 ), /* w07 w05 w03 w01 */
SHORT4_TO_QWORD( 19266, -19266, 19266, 19266 ), /* w14 w12 w10 w08 */
SHORT4_TO_QWORD(-10426, 25172, -25172, -10426 ), /* w15 w13 w11 w09 */
SHORT4_TO_QWORD( 26722, 15137, 22654, -26722 ), /* w22 w20 w18 w16 */
SHORT4_TO_QWORD( 22654, 5315, -5315, -15137 ), /* w23 w21 w19 w17 */
SHORT4_TO_QWORD( 15137, 5315, 5315, 22654 ), /* w30 w28 w26 w24 */
SHORT4_TO_QWORD(-26722, 22654, -15137, -26722 ), /* w31 w29 w27 w25 */
/* Table for rows 0,4 - constants are multiplied by cos_4_16 */
SHORT4_TO_QWORD( 16384, 16384, 16384, -16384 ), /* movq-> w06 w04 w02 w00 */
SHORT4_TO_QWORD( 21407, 8867, 8867, -21407 ), /* w07 w05 w03 w01 */
SHORT4_TO_QWORD( 16384, -16384, 16384, 16384 ), /* w14 w12 w10 w08 */
SHORT4_TO_QWORD(-8867, 21407, -21407, -8867 ), /* w15 w13 w11 w09 */
SHORT4_TO_QWORD( 22725, 12873, 19266, -22725 ), /* w22 w20 w18 w16 */
SHORT4_TO_QWORD( 19266, 4520, -4520, -12873 ), /* w23 w21 w19 w17 */
SHORT4_TO_QWORD( 12873, 4520, 4520, 19266 ), /* w30 w28 w26 w24 */
SHORT4_TO_QWORD(-22725, 19266, -12873, -22725 ), /* w31 w29 w27 w25 */
/* Table for rows 3,5 - constants are multiplied by cos_3_16 */
SHORT4_TO_QWORD( 19266, 19266, 19266, -19266 ), /* movq-> w06 w04 w02 w00 */
SHORT4_TO_QWORD( 25172, 10426, 10426, -25172 ), /* w07 w05 w03 w01 */
SHORT4_TO_QWORD( 19266, -19266, 19266, 19266 ), /* w14 w12 w10 w08 */
SHORT4_TO_QWORD(-10426, 25172, -25172, -10426 ), /* w15 w13 w11 w09 */
SHORT4_TO_QWORD( 26722, 15137, 22654, -26722 ), /* w22 w20 w18 w16 */
SHORT4_TO_QWORD( 22654, 5315, -5315, -15137 ), /* w23 w21 w19 w17 */
SHORT4_TO_QWORD( 15137, 5315, 5315, 22654 ), /* w30 w28 w26 w24 */
SHORT4_TO_QWORD(-26722, 22654, -15137, -26722 ), /* w31 w29 w27 w25 */
/* Table for rows 2,6 - constants are multiplied by cos_2_16 */
SHORT4_TO_QWORD( 21407, 21407, 21407, -21407 ), /* movq-> w06 w04 w02 w00 */
SHORT4_TO_QWORD( 27969, 11585, 11585, -27969 ), /* w07 w05 w03 w01 */
SHORT4_TO_QWORD( 21407, -21407, 21407, 21407 ), /* w14 w12 w10 w08 */
SHORT4_TO_QWORD(-11585, 27969, -27969, -11585 ), /* w15 w13 w11 w09 */
SHORT4_TO_QWORD( 29692, 16819, 25172, -29692 ), /* w22 w20 w18 w16 */
SHORT4_TO_QWORD( 25172, 5906, -5906, -16819 ), /* w23 w21 w19 w17 */
SHORT4_TO_QWORD( 16819, 5906, 5906, 25172 ), /* w30 w28 w26 w24 */
SHORT4_TO_QWORD(-29692, 25172, -16819, -29692 ), /* w31 w29 w27 w25 */
/* Table for rows 1,7 - constants are multiplied by cos_1_16 */
SHORT4_TO_QWORD( 22725, 22725, 22725, -22725 ), /* movq-> w06 w04 w02 w00 */
SHORT4_TO_QWORD( 29692, 12299, 12299, -29692 ), /* w07 w05 w03 w01 */
SHORT4_TO_QWORD( 22725, -22725, 22725, 22725 ), /* w14 w12 w10 w08 */
SHORT4_TO_QWORD(-12299, 29692, -29692, -12299 ), /* w15 w13 w11 w09 */
SHORT4_TO_QWORD( 31521, 17855, 26722, -31521 ), /* w22 w20 w18 w16 */
SHORT4_TO_QWORD( 26722, 6270, -6270, -17855 ), /* w23 w21 w19 w17 */
SHORT4_TO_QWORD( 17855, 6270, 6270, 26722 ), /* w30 w28 w26 w24 */
SHORT4_TO_QWORD(-31521, 26722, -17855, -31521 ), /* w31 w29 w27 w25 */
};
uint64_t tempMatrix[64/4];
#define INP eax
#define ROUNDER ebx
#define TABLE ecx
#define OUTP edx
/* the function itself */
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