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FFmpeg/libavcodec/i386/fdct_mmx.c
Michael Niedermayer ad324c9351 dct cleanup 
more accurate mmx dct (dont discard bits for fun)
fixing mmx quantizer bug for qscale%2==1 (bias was slightly wrong)

Originally committed as revision 895 to svn://svn.ffmpeg.org/ffmpeg/trunk
2002-09-01 16:52:33 +00:00

292 lines
10 KiB
C
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/*
* MMX optimized forward DCT
* The gcc porting is Copyright (c) 2001 Fabrice Bellard.
*
* from fdctam32.c - AP922 MMX(3D-Now) forward-DCT
*
* Intel Application Note AP-922 - fast, precise implementation of DCT
* http://developer.intel.com/vtune/cbts/appnotes.htm
*/
#include "../common.h"
#include "mmx.h"
#define ATTR_ALIGN(align) __attribute__ ((__aligned__ (align)))
//////////////////////////////////////////////////////////////////////
//
// 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 - 3)
//#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))
//concatenated table, for forward DCT transformation
const int16_t fdct_tg_all_16[] ATTR_ALIGN(8) = {
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
};
const int16_t cos_4_16[4] = {
-19195, -19195, -19195, -19195, //cos * (2<<16) + 0.5
};
const int16_t ocos_4_16[4] = {
23170, 23170, 23170, 23170, //cos * (2<<15) + 0.5
};
const long long fdct_one_corr ATTR_ALIGN(8) = 0x0001000100010001LL;
const long fdct_r_row[2] ATTR_ALIGN(8) = {RND_FRW_ROW, RND_FRW_ROW };
const int16_t tab_frw_01234567[] ATTR_ALIGN(8) = { // 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
};
static inline void fdct_col(const int16_t *in, int16_t *out, int offset)
{
movq_m2r(*(in + offset + 1 * 8), mm0);
movq_m2r(*(in + offset + 6 * 8), mm1);
movq_r2r(mm0, mm2);
movq_m2r(*(in + offset + 2 * 8), mm3);
paddsw_r2r(mm1, mm0);
movq_m2r(*(in + offset + 5 * 8), mm4);
psllw_i2r(SHIFT_FRW_COL, mm0);
movq_m2r(*(in + offset + 0 * 8), mm5);
paddsw_r2r(mm3, mm4);
paddsw_m2r(*(in + offset + 7 * 8), mm5);
psllw_i2r(SHIFT_FRW_COL, mm4);
movq_r2r(mm0, mm6);
psubsw_r2r(mm1, mm2);
movq_m2r(*(fdct_tg_all_16 + 4), mm1);
psubsw_r2r(mm4, mm0);
movq_m2r(*(in + offset + 3 * 8), mm7);
pmulhw_r2r(mm0, mm1);
paddsw_m2r(*(in + offset + 4 * 8), mm7);
psllw_i2r(SHIFT_FRW_COL, mm5);
paddsw_r2r(mm4, mm6);
psllw_i2r(SHIFT_FRW_COL, mm7);
movq_r2r(mm5, mm4);
psubsw_r2r(mm7, mm5);
paddsw_r2r(mm5, mm1);
paddsw_r2r(mm7, mm4);
por_m2r(fdct_one_corr, mm1);
psllw_i2r(SHIFT_FRW_COL + 1, mm2);
pmulhw_m2r(*(fdct_tg_all_16 + 4), mm5);
movq_r2r(mm4, mm7);
psubsw_m2r(*(in + offset + 5 * 8), mm3);
psubsw_r2r(mm6, mm4);
movq_r2m(mm1, *(out + offset + 2 * 8));
paddsw_r2r(mm6, mm7);
movq_m2r(*(in + offset + 3 * 8), mm1);
psllw_i2r(SHIFT_FRW_COL + 1, mm3);
psubsw_m2r(*(in + offset + 4 * 8), mm1);
movq_r2r(mm2, mm6);
movq_r2m(mm4, *(out + offset + 4 * 8));
paddsw_r2r(mm3, mm2);
pmulhw_m2r(*ocos_4_16, mm2);
psubsw_r2r(mm3, mm6);
pmulhw_m2r(*ocos_4_16, mm6);
psubsw_r2r(mm0, mm5);
por_m2r(fdct_one_corr, mm5);
psllw_i2r(SHIFT_FRW_COL, mm1);
por_m2r(fdct_one_corr, mm2);
movq_r2r(mm1, mm4);
movq_m2r(*(in + offset + 0 * 8), mm3);
paddsw_r2r(mm6, mm1);
psubsw_m2r(*(in + offset + 7 * 8), mm3);
psubsw_r2r(mm6, mm4);
movq_m2r(*(fdct_tg_all_16 + 0), mm0);
psllw_i2r(SHIFT_FRW_COL, mm3);
movq_m2r(*(fdct_tg_all_16 + 8), mm6);
pmulhw_r2r(mm1, mm0);
movq_r2m(mm7, *(out + offset + 0 * 8));
pmulhw_r2r(mm4, mm6);
movq_r2m(mm5, *(out + offset + 6 * 8));
movq_r2r(mm3, mm7);
movq_m2r(*(fdct_tg_all_16 + 8), mm5);
psubsw_r2r(mm2, mm7);
paddsw_r2r(mm2, mm3);
pmulhw_r2r(mm7, mm5);
paddsw_r2r(mm3, mm0);
paddsw_r2r(mm4, mm6);
pmulhw_m2r(*(fdct_tg_all_16 + 0), mm3);
por_m2r(fdct_one_corr, mm0);
paddsw_r2r(mm7, mm5);
psubsw_r2r(mm6, mm7);
movq_r2m(mm0, *(out + offset + 1 * 8));
paddsw_r2r(mm4, mm5);
movq_r2m(mm7, *(out + offset + 3 * 8));
psubsw_r2r(mm1, mm3);
movq_r2m(mm5, *(out + offset + 5 * 8));
movq_r2m(mm3, *(out + offset + 7 * 8));
}
static inline void fdct_row(const int16_t *in, int16_t *out, const int16_t *table)
{
movd_m2r(*(in + 6), mm5);
punpcklwd_m2r(*(in + 4), mm5);
movq_r2r(mm5, mm2);
psrlq_i2r(0x20, mm5);
movq_m2r(*(in + 0), mm0);
punpcklwd_r2r(mm2, mm5);
movq_r2r(mm0, mm1);
paddsw_r2r(mm5, mm0);
psubsw_r2r(mm5, mm1);
movq_r2r(mm0, mm2);
punpcklwd_r2r(mm1, mm0);
punpckhwd_r2r(mm1, mm2);
movq_r2r(mm2, mm1);
movq_r2r(mm0, mm2);
movq_m2r(*(table + 0), mm3);
punpcklwd_r2r(mm1, mm0);
movq_r2r(mm0, mm5);
punpckldq_r2r(mm0, mm0);
movq_m2r(*(table + 4), mm4);
punpckhwd_r2r(mm1, mm2);
pmaddwd_r2r(mm0, mm3);
movq_r2r(mm2, mm6);
movq_m2r(*(table + 16), mm1);
punpckldq_r2r(mm2, mm2);
pmaddwd_r2r(mm2, mm4);
punpckhdq_r2r(mm5, mm5);
pmaddwd_m2r(*(table + 8), mm0);
punpckhdq_r2r(mm6, mm6);
movq_m2r(*(table + 20), mm7);
pmaddwd_r2r(mm5, mm1);
paddd_m2r(*fdct_r_row, mm3);
pmaddwd_r2r(mm6, mm7);
pmaddwd_m2r(*(table + 12), mm2);
paddd_r2r(mm4, mm3);
pmaddwd_m2r(*(table + 24), mm5);
pmaddwd_m2r(*(table + 28), mm6);
paddd_r2r(mm7, mm1);
paddd_m2r(*fdct_r_row, mm0);
psrad_i2r(SHIFT_FRW_ROW, mm3);
paddd_m2r(*fdct_r_row, mm1);
paddd_r2r(mm2, mm0);
paddd_m2r(*fdct_r_row, mm5);
psrad_i2r(SHIFT_FRW_ROW, mm1);
paddd_r2r(mm6, mm5);
psrad_i2r(SHIFT_FRW_ROW, mm0);
psrad_i2r(SHIFT_FRW_ROW, mm5);
packssdw_r2r(mm0, mm3);
packssdw_r2r(mm5, mm1);
movq_r2r(mm3, mm6);
punpcklwd_r2r(mm1, mm3);
punpckhwd_r2r(mm1, mm6);
movq_r2m(mm3, *(out + 0));
movq_r2m(mm6, *(out + 4));
}
void fdct_mmx(int16_t *block)
{
/* XXX: not thread safe */
static int16_t block_tmp[64] ATTR_ALIGN(8);
int16_t *block1, *out;
const int16_t *table;
int i;
block1 = block_tmp;
fdct_col(block, block1, 0);
fdct_col(block, block1, 4);
block1 = block_tmp;
table = tab_frw_01234567;
out = block;
for(i=8;i>0;i--) {
fdct_row(block1, out, table);
block1 += 8;
table += 32;
out += 8;
}
}
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