📄 text_fdct_mmx.c
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//////////////////////////////////////////////////////////////////////////////
//
// fdctmm32.c - AP922 MMX fDCT
// ----------
// Intel Application Note AP-922 - fast, precise implementation of DCT
// http://developer.intel.com/vtune/cbts/appnotes.htm
// ----------
//
// This code will run on any MMX CPU. The dct_row operation can be
// further optimized using PentiumIII/Athlon instructions (pshufw.)
// If the code will be run on a 3D-Now CPU (AMD K6-2/Athlon), a slight
// accruacy-boost can be obtained. Please see fdctam32.c for details.
//
// For a fast, precise MMX implementation of inverse-DCT
// visit http://www.elecard.com/peter
// or check out Avery Lee's Virtualdub source-code
// http://www.concentric.net/~psilon
//
// Revision history
// ----------------
//
// v1.01 08/26/2000 (clipper bugfix)
// In my haste to get this code out the door, I neglected to consider
// the numerical range of output. I *believe* an IEEE-1180/1990 fdct
// is range-limited to {-2048, +2047}.
// fdctmm32.c now saturates the output DCT coefficients to this range.
// A few comment typos were corrected. Equivalent-C code for
// the forward_dct column stage has also been added. The pseudo-C
// code in Intel's AP-922 omits several important operations that
// would cause dct8_frw_col() to fail, if it were used directly without
// modification.
// There is still room for additional optimization in the
// frw_dct_row_mmx() function. The data pack/unpack operation could be
// shortened with pshufw.
//
// v1.0 07/20/2000 (initial release)
// Initial release of AP922 MMX forward_DCT.
//
//
// liaor@iname.com http://members.tripod.com/~liaor
//////////////////////////////////////////////////////////////////////////////
#define INP eax // pointer to (short *blk)
#define OUT ecx // pointer to output (temporary store space qwTemp[])
#define TABLE ebx // pointer to tab_frw_01234567[]
#define TABLEF ebx // pointer to tg_all_16
#define round_frw_row edx
//#define round_frw_col edx
#define x0 INP + 0*16
#define x1 INP + 1*16
#define x2 INP + 2*16
#define x3 INP + 3*16
#define x4 INP + 4*16
#define x5 INP + 5*16
#define x6 INP + 6*16
#define x7 INP + 7*16
#define y0 OUT + 0*16
#define y1 OUT + 1*16
#define y2 OUT + 2*16
#define y3 OUT + 3*16
#define y4 OUT + 4*16
#define y5 OUT + 5*16
#define y6 OUT + 6*16
#define y7 OUT + 7*16
//////////////////////////////////////////////////////////////////////
//
// constants for the forward DCT
// -----------------------------
//
// Be sure to check that your compiler is aligning all constants to QWORD
// (8-byte) memory boundaries! Otherwise the unaligned memory access will
// severely stall MMX execution.
//
//////////////////////////////////////////////////////////////////////
#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)
// v1.01 The original SHIFT_FRW_ROW constant has been replaced by a
// "two stage" shift operation. The 1st-shift (CLIP1) aligns the
// intermediate 32-bit integer data to a {-32768, +32768} (16-bit word)
// range. The MMX instruction "packssdw" simultaneous clips and packs
// the intermediate-data into 16-bit format.
// The 2nd-shift (CLIP2) restores the proper final range {-2048,+2047}
#define SHIFT_FRW_ROW_CLIP2 (4) // 4-bit shift -> { 32768 <> 2048 }
#define SHIFT_FRW_ROW_CLIP1 ( SHIFT_FRW_ROW - SHIFT_FRW_ROW_CLIP2 )
//#define RND_FRW_ROW (262144 * (BITS_FRW_ACC - 1)) //; 1 << (SHIFT_FRW_ROW-1)
#define RND_FRW_ROW (1 << (SHIFT_FRW_ROW-1))
//#define RND_FRW_COL (2 * (BITS_FRW_ACC - 1)) //; 1 << (SHIFT_FRW_COL-1)
#define RND_FRW_COL (1 << (SHIFT_FRW_COL-1))
const static __int64 one_corr = 0x0001000100010001;
const static long r_frw_row[2] = {RND_FRW_ROW, RND_FRW_ROW };
//const static short tg_1_16[4] = {13036, 13036, 13036, 13036 }; //tg * (2<<16) + 0.5
//const static short tg_2_16[4] = {27146, 27146, 27146, 27146 }; //tg * (2<<16) + 0.5
//const static short tg_3_16[4] = {-21746, -21746, -21746, -21746 }; //tg * (2<<16) + 0.5
//const static short cos_4_16[4] = {-19195, -19195, -19195, -19195 }; //cos * (2<<16) + 0.5
//const static short ocos_4_16[4] = {23170, 23170, 23170, 23170 }; //cos * (2<<15) + 0.5
//concatenated table, for forward DCT-column transformation
const static short tg_all_16[] = {
13036, 13036, 13036, 13036, // tg * (2<<16) + 0.5
27146, 27146, 27146, 27146, // tg * (2<<16) + 0.5
-21746, -21746, -21746, -21746, // tg * (2<<16) + 0.5
-19195, -19195, -19195, -19195, //cos * (2<<16) + 0.5
23170, 23170, 23170, 23170 }; //cos * (2<<15) + 0.5
#define tg_1_16 (TABLEF + 0)
#define tg_2_16 (TABLEF + 8)
#define tg_3_16 (TABLEF + 16)
#define cos_4_16 (TABLEF + 24)
#define ocos_4_16 (TABLEF + 32)
// CONCATENATED IDCT COEFF TABLE, rows 0,1,2,3,4,5,6,7 (in order )
//
/*
static const short tab_inv_01234567[] = { // inverse_dct coeff table
//row0, this row is required
16384, 16384, 16384, -16384, // ; movq-> w06 w04 w02 w00
21407, 8867, 8867, -21407, // w07 w05 w03 w01
16384, -16384, 16384, 16384, //; w14 w12 w10 w08
-8867, 21407, -21407, -8867, //; w15 w13 w11 w09
22725, 12873, 19266, -22725, //; w22 w20 w18 w16
19266, 4520, -4520, -12873, //; w23 w21 w19 w17
12873, 4520, 4520, 19266, //; w30 w28 w26 w24
-22725, 19266, -12873, -22725, //w31 w29 w27 w25
//row1
22725, 22725, 22725, -22725, // ; movq-> w06 w04 w02 w00
29692, 12299, 12299, -29692, // ; w07 w05 w03 w01
22725, -22725, 22725, 22725, //; w14 w12 w10 w08
-12299, 29692, -29692, -12299, //; w15 w13 w11 w09
31521, 17855, 26722, -31521, //; w22 w20 w18 w16
26722, 6270, -6270, -17855, //; w23 w21 w19 w17
17855, 6270, 6270, 26722, //; w30 w28 w26 w24
-31521, 26722, -17855, -31521, // w31 w29 w27 w25
//row2
21407, 21407, 21407, -21407, // ; movq-> w06 w04 w02 w00
27969, 11585, 11585, -27969, // ; w07 w05 w03 w01
21407, -21407, 21407, 21407, // ; w14 w12 w10 w08
-11585, 27969, -27969, -11585, // ;w15 w13 w11 w09
29692, 16819, 25172, -29692, // ;w22 w20 w18 w16
25172, 5906, -5906, -16819, // ;w23 w21 w19 w17
16819, 5906, 5906, 25172, // ;w30 w28 w26 w24
-29692, 25172, -16819, -29692, // ;w31 w29 w27 w25
//row3
19266, 19266, 19266, -19266, //; movq-> w06 w04 w02 w00
25172, 10426, 10426, -25172, //; w07 w05 w03 w01
19266, -19266, 19266, 19266, //; w14 w12 w10 w08
-10426, 25172, -25172, -10426, //; w15 w13 w11 w09
26722, 15137, 22654, -26722, //; w22 w20 w18 w16
22654, 5315, -5315, -15137, //; w23 w21 w19 w17
15137, 5315, 5315, 22654, //; w30 w28 w26 w24
-26722, 22654, -15137, -26722, //; w31 w29 w27 w25
//row4
16384, 16384, 16384, -16384, // ; movq-> w06 w04 w02 w00
21407, 8867, 8867, -21407, // w07 w05 w03 w01
16384, -16384, 16384, 16384, //; w14 w12 w10 w08
-8867, 21407, -21407, -8867, //; w15 w13 w11 w09
22725, 12873, 19266, -22725, //; w22 w20 w18 w16
19266, 4520, -4520, -12873, //; w23 w21 w19 w17
12873, 4520, 4520, 19266, //; w30 w28 w26 w24
-22725, 19266, -12873, -22725, //w31 w29 w27 w25
//row5
19266, 19266, 19266, -19266, //; movq-> w06 w04 w02 w00
25172, 10426, 10426, -25172, //; w07 w05 w03 w01
19266, -19266, 19266, 19266, //; w14 w12 w10 w08
-10426, 25172, -25172, -10426, //; w15 w13 w11 w09
26722, 15137, 22654, -26722, //; w22 w20 w18 w16
22654, 5315, -5315, -15137, //; w23 w21 w19 w17
15137, 5315, 5315, 22654, //; w30 w28 w26 w24
-26722, 22654, -15137, -26722, //; w31 w29 w27 w25
//row6
21407, 21407, 21407, -21407, // ; movq-> w06 w04 w02 w00
27969, 11585, 11585, -27969, // ; w07 w05 w03 w01
21407, -21407, 21407, 21407, // ; w14 w12 w10 w08
-11585, 27969, -27969, -11585, // ;w15 w13 w11 w09
29692, 16819, 25172, -29692, // ;w22 w20 w18 w16
25172, 5906, -5906, -16819, // ;w23 w21 w19 w17
16819, 5906, 5906, 25172, // ;w30 w28 w26 w24
-29692, 25172, -16819, -29692, // ;w31 w29 w27 w25
//row7
22725, 22725, 22725, -22725, // ; movq-> w06 w04 w02 w00
29692, 12299, 12299, -29692, // ; w07 w05 w03 w01
22725, -22725, 22725, 22725, //; w14 w12 w10 w08
-12299, 29692, -29692, -12299, //; w15 w13 w11 w09
31521, 17855, 26722, -31521, //; w22 w20 w18 w16
26722, 6270, -6270, -17855, //; w23 w21 w19 w17
17855, 6270, 6270, 26722, //; w30 w28 w26 w24
-31521, 26722, -17855, -31521}; // w31 w29 w27 w25
*/
static const short tab_frw_01234567[] = { // forward_dct coeff table
//row0
16384, 16384, 21407, -8867, // w09 w01 w08 w00
16384, 16384, 8867, -21407, // w13 w05 w12 w04
16384, -16384, 8867, 21407, // w11 w03 w10 w02
-16384, 16384, -21407, -8867, // w15 w07 w14 w06
22725, 12873, 19266, -22725, // w22 w20 w18 w16
19266, 4520, -4520, -12873, // w23 w21 w19 w17
12873, 4520, 4520, 19266, // w30 w28 w26 w24
-22725, 19266, -12873, -22725, // w31 w29 w27 w25
//row1
22725, 22725, 29692, -12299, // w09 w01 w08 w00
22725, 22725, 12299, -29692, // w13 w05 w12 w04
22725, -22725, 12299, 29692, // w11 w03 w10 w02
-22725, 22725, -29692, -12299, // w15 w07 w14 w06
31521, 17855, 26722, -31521, // w22 w20 w18 w16
26722, 6270, -6270, -17855, // w23 w21 w19 w17
17855, 6270, 6270, 26722, // w30 w28 w26 w24
-31521, 26722, -17855, -31521, // w31 w29 w27 w25
//row2
21407, 21407, 27969, -11585, // w09 w01 w08 w00
21407, 21407, 11585, -27969, // w13 w05 w12 w04
21407, -21407, 11585, 27969, // w11 w03 w10 w02
-21407, 21407, -27969, -11585, // w15 w07 w14 w06
29692, 16819, 25172, -29692, // w22 w20 w18 w16
25172, 5906, -5906, -16819, // w23 w21 w19 w17
16819, 5906, 5906, 25172, // w30 w28 w26 w24
-29692, 25172, -16819, -29692, // w31 w29 w27 w25
//row3
19266, 19266, 25172, -10426, // w09 w01 w08 w00
19266, 19266, 10426, -25172, // w13 w05 w12 w04
19266, -19266, 10426, 25172, // w11 w03 w10 w02
-19266, 19266, -25172, -10426, // w15 w07 w14 w06,
26722, 15137, 22654, -26722, // w22 w20 w18 w16
22654, 5315, -5315, -15137, // w23 w21 w19 w17
15137, 5315, 5315, 22654, // w30 w28 w26 w24
-26722, 22654, -15137, -26722, // w31 w29 w27 w25,
//row4
16384, 16384, 21407, -8867, // w09 w01 w08 w00
16384, 16384, 8867, -21407, // w13 w05 w12 w04
16384, -16384, 8867, 21407, // w11 w03 w10 w02
-16384, 16384, -21407, -8867, // w15 w07 w14 w06
22725, 12873, 19266, -22725, // w22 w20 w18 w16
19266, 4520, -4520, -12873, // w23 w21 w19 w17
12873, 4520, 4520, 19266, // w30 w28 w26 w24
-22725, 19266, -12873, -22725, // w31 w29 w27 w25
//row5
19266, 19266, 25172, -10426, // w09 w01 w08 w00
19266, 19266, 10426, -25172, // w13 w05 w12 w04
19266, -19266, 10426, 25172, // w11 w03 w10 w02
-19266, 19266, -25172, -10426, // w15 w07 w14 w06
26722, 15137, 22654, -26722, // w22 w20 w18 w16
22654, 5315, -5315, -15137, // w23 w21 w19 w17
15137, 5315, 5315, 22654, // w30 w28 w26 w24
-26722, 22654, -15137, -26722, // w31 w29 w27 w25
//row6
21407, 21407, 27969, -11585, // w09 w01 w08 w00
21407, 21407, 11585, -27969, // w13 w05 w12 w04
21407, -21407, 11585, 27969, // w11 w03 w10 w02
-21407, 21407, -27969, -11585, // w15 w07 w14 w06,
29692, 16819, 25172, -29692, // w22 w20 w18 w16
25172, 5906, -5906, -16819, // w23 w21 w19 w17
16819, 5906, 5906, 25172, // w30 w28 w26 w24
-29692, 25172, -16819, -29692, // w31 w29 w27 w25,
//row7
22725, 22725, 29692, -12299, // w09 w01 w08 w00
22725, 22725, 12299, -29692, // w13 w05 w12 w04
22725, -22725, 12299, 29692, // w11 w03 w10 w02
-22725, 22725, -29692, -12299, // w15 w07 w14 w06,
31521, 17855, 26722, -31521, // w22 w20 w18 w16
26722, 6270, -6270, -17855, // w23 w21 w19 w17
17855, 6270, 6270, 26722, // w30 w28 w26 w24
-31521, 26722, -17855, -31521 // w31 w29 w27 w25
};
void
fdct_mm32( short *blk )
{
static __int64 xt70[2]; // xt7xt6xt5xt4, xt3xt2xt1xt0
static int a0, a1, a2, a3, b0, b1, b2, b3;
static short *sptr, *optr, *tf; // tf = table_ptr
static short *xt = (short *) &xt70[0];
static int j;
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