ffmpeg/libavcodec/i386/fdct_mmx.c

/*
 * MMX optimized forward DCT
 * The gcc porting is Copyright (c) 2001 Fabrice Bellard.
 * cleanup/optimizations are Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
 *
 * 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
static 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
};
static const int16_t cos_4_16[4] ATTR_ALIGN(8) = {
    -19195, -19195, -19195, -19195,	//cos * (2<<16) + 0.5
};

static const int16_t ocos_4_16[4] ATTR_ALIGN(8) = {
    23170, 23170, 23170, 23170,	//cos * (2<<15) + 0.5
};

static const long long  fdct_one_corr ATTR_ALIGN(8) = 0x0001000100010001LL;
static const long fdct_r_row[2] ATTR_ALIGN(8) = {RND_FRW_ROW, RND_FRW_ROW };

static const int16_t tab_frw_01234567[] ATTR_ALIGN(8) = {  // forward_dct coeff table
  16384,   16384,   -8867,  -21407, 
  16384,   16384,   21407,    8867, 
  16384,  -16384,   21407,   -8867, 
 -16384,   16384,    8867,  -21407, 
  22725,   19266,  -22725,  -12873, 
  12873,    4520,   19266,   -4520, 
  12873,  -22725,   19266,  -22725, 
   4520,   19266,    4520,  -12873, 

  22725,   22725,  -12299,  -29692, 
  22725,   22725,   29692,   12299, 
  22725,  -22725,   29692,  -12299, 
 -22725,   22725,   12299,  -29692, 
  31521,   26722,  -31521,  -17855, 
  17855,    6270,   26722,   -6270, 
  17855,  -31521,   26722,  -31521, 
   6270,   26722,    6270,  -17855, 

  21407,   21407,  -11585,  -27969, 
  21407,   21407,   27969,   11585, 
  21407,  -21407,   27969,  -11585, 
 -21407,   21407,   11585,  -27969, 
  29692,   25172,  -29692,  -16819, 
  16819,    5906,   25172,   -5906, 
  16819,  -29692,   25172,  -29692, 
   5906,   25172,    5906,  -16819, 

  19266,   19266,  -10426,  -25172, 
  19266,   19266,   25172,   10426, 
  19266,  -19266,   25172,  -10426, 
 -19266,   19266,   10426,  -25172, 
  26722,   22654,  -26722,  -15137, 
  15137,    5315,   22654,   -5315, 
  15137,  -26722,   22654,  -26722, 
   5315,   22654,    5315,  -15137, 

  16384,   16384,   -8867,  -21407, 
  16384,   16384,   21407,    8867, 
  16384,  -16384,   21407,   -8867, 
 -16384,   16384,    8867,  -21407, 
  22725,   19266,  -22725,  -12873, 
  12873,    4520,   19266,   -4520, 
  12873,  -22725,   19266,  -22725, 
   4520,   19266,    4520,  -12873, 

  19266,   19266,  -10426,  -25172, 
  19266,   19266,   25172,   10426, 
  19266,  -19266,   25172,  -10426, 
 -19266,   19266,   10426,  -25172, 
  26722,   22654,  -26722,  -15137, 
  15137,    5315,   22654,   -5315, 
  15137,  -26722,   22654,  -26722, 
   5315,   22654,    5315,  -15137, 

  21407,   21407,  -11585,  -27969, 
  21407,   21407,   27969,   11585, 
  21407,  -21407,   27969,  -11585, 
 -21407,   21407,   11585,  -27969, 
  29692,   25172,  -29692,  -16819, 
  16819,    5906,   25172,   -5906, 
  16819,  -29692,   25172,  -29692, 
   5906,   25172,    5906,  -16819, 

  22725,   22725,  -12299,  -29692, 
  22725,   22725,   29692,   12299, 
  22725,  -22725,   29692,  -12299, 
 -22725,   22725,   12299,  -29692, 
  31521,   26722,  -31521,  -17855, 
  17855,    6270,   26722,   -6270, 
  17855,  -31521,   26722,  -31521, 
   6270,   26722,    6270,  -17855, 
};


static always_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 always_inline void fdct_row_mmx2(const int16_t *in, int16_t *out, const int16_t *table)
{ 
    pshufw_m2r(*(in + 4), mm5, 0x1B);
    movq_m2r(*(in + 0), mm0);
    movq_r2r(mm0, mm1);	
    paddsw_r2r(mm5, mm0);
    psubsw_r2r(mm5, mm1);
    pshufw_r2r(mm0, mm2, 0x4E);
    pshufw_r2r(mm1, mm3, 0x4E);
    movq_m2r(*(table + 0), mm4);
    movq_m2r(*(table + 4), mm6);
    movq_m2r(*(table + 16), mm5);
    movq_m2r(*(table + 20), mm7);
    pmaddwd_r2r(mm0, mm4);
    pmaddwd_r2r(mm1, mm5);
    pmaddwd_r2r(mm2, mm6);
    pmaddwd_r2r(mm3, mm7);
    pmaddwd_m2r(*(table + 8), mm0);
    pmaddwd_m2r(*(table + 12), mm2);
    pmaddwd_m2r(*(table + 24), mm1);
    pmaddwd_m2r(*(table + 28), mm3);
    paddd_r2r(mm6, mm4);
    paddd_r2r(mm7, mm5);
    paddd_r2r(mm2, mm0);
    paddd_r2r(mm3, mm1);
    movq_m2r(*fdct_r_row, mm7);
    paddd_r2r(mm7, mm4);
    paddd_r2r(mm7, mm5);
    paddd_r2r(mm7, mm0);
    paddd_r2r(mm7, mm1);
    psrad_i2r(SHIFT_FRW_ROW, mm4);
    psrad_i2r(SHIFT_FRW_ROW, mm5);
    psrad_i2r(SHIFT_FRW_ROW, mm0);
    psrad_i2r(SHIFT_FRW_ROW, mm1);
    packssdw_r2r(mm0, mm4);
    packssdw_r2r(mm1, mm5);
    movq_r2r(mm4, mm2);
    punpcklwd_r2r(mm5, mm4);
    punpckhwd_r2r(mm5, mm2);
    movq_r2m(mm4, *(out + 0));
    movq_r2m(mm2, *(out + 4));
}

static always_inline void fdct_row_mmx(const int16_t *in, int16_t *out, const int16_t *table)
{ 
    movd_m2r(*(in + 6), mm1);
    punpcklwd_m2r(*(in + 4), mm1);
    movq_r2r(mm1, mm2);
    psrlq_i2r(0x20, mm1);
    movq_m2r(*(in + 0), mm0);
    punpcklwd_r2r(mm2, mm1);
    movq_r2r(mm0, mm5);	
    paddsw_r2r(mm1, mm0);
    psubsw_r2r(mm1, mm5);
    movq_r2r(mm0, mm1);	    
    movq_r2r(mm5, mm6);	
    punpckldq_r2r(mm5, mm3);
    punpckhdq_r2r(mm3, mm6);
    movq_m2r(*(table + 0), mm3);
    movq_m2r(*(table + 4), mm4);
    punpckldq_r2r(mm0, mm2);
    pmaddwd_r2r(mm0, mm3);
    punpckhdq_r2r(mm2, mm1);
    movq_m2r(*(table + 16), mm2);
    pmaddwd_r2r(mm1, mm4);
    pmaddwd_m2r(*(table + 8), mm0);
    movq_m2r(*(table + 20), mm7);
    pmaddwd_r2r(mm5, mm2);
    paddd_m2r(*fdct_r_row, mm3);
    pmaddwd_r2r(mm6, mm7);
    pmaddwd_m2r(*(table + 12), mm1);
    paddd_r2r(mm4, mm3);
    pmaddwd_m2r(*(table + 24), mm5);
    pmaddwd_m2r(*(table + 28), mm6);
    paddd_r2r(mm7, mm2);
    paddd_m2r(*fdct_r_row, mm0);
    psrad_i2r(SHIFT_FRW_ROW, mm3);
    paddd_m2r(*fdct_r_row, mm2);
    paddd_r2r(mm1, mm0);
    paddd_m2r(*fdct_r_row, mm5);
    psrad_i2r(SHIFT_FRW_ROW, mm2);
    paddd_r2r(mm6, mm5);
    psrad_i2r(SHIFT_FRW_ROW, mm0);
    psrad_i2r(SHIFT_FRW_ROW, mm5);
    packssdw_r2r(mm0, mm3);
    packssdw_r2r(mm5, mm2);
    movq_r2r(mm3, mm6);
    punpcklwd_r2r(mm2, mm3);
    punpckhwd_r2r(mm2, mm6);
    movq_r2m(mm3, *(out + 0));
    movq_r2m(mm6, *(out + 4));
}

void ff_fdct_mmx(int16_t *block)
{
    int64_t align_tmp[16] ATTR_ALIGN(8);
    int16_t * const block_tmp= (int16_t*)align_tmp;
    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_mmx(block1, out, table);
        block1 += 8;
        table += 32;
        out += 8;
    }
}

void ff_fdct_mmx2(int16_t *block)
{
    int64_t align_tmp[16] ATTR_ALIGN(8);
    int16_t * const block_tmp= (int16_t*)align_tmp;
    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_mmx2(block1, out, table);
        block1 += 8;
        table += 32;
        out += 8;
    }
}