idct_mmx.c

mediastreamer2是开源的网络传输媒体流的库

/*
 * idct_mmx.c
 * Copyright (C) 1999-2001 Aaron Holtzman <[e-mail]>
 *
 * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
 *
 * mpeg2dec is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * mpeg2dec is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with mpeg2dec; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "common.h"
#include "dsputil.h"

#include "mmx.h"

#define ATTR_ALIGN(align) __attribute__ ((__aligned__ (align)))

#define ROW_SHIFT 11
#define COL_SHIFT 6

#define round(bias) ((int)(((bias)+0.5) * (1<<ROW_SHIFT)))
#define rounder(bias) {round (bias), round (bias)}

#if 0
/* C row IDCT - it is just here to document the MMXEXT and MMX versions */
static inline void idct_row (int16_t * row, int offset,
                             int16_t * table, int32_t * rounder)
{
    int C1, C2, C3, C4, C5, C6, C7;
    int a0, a1, a2, a3, b0, b1, b2, b3;

    row += offset;

    C1 = table[1];
    C2 = table[2];
    C3 = table[3];
    C4 = table[4];
    C5 = table[5];
    C6 = table[6];
    C7 = table[7];

    a0 = C4*row[0] + C2*row[2] + C4*row[4] + C6*row[6] + *rounder;
    a1 = C4*row[0] + C6*row[2] - C4*row[4] - C2*row[6] + *rounder;
    a2 = C4*row[0] - C6*row[2] - C4*row[4] + C2*row[6] + *rounder;
    a3 = C4*row[0] - C2*row[2] + C4*row[4] - C6*row[6] + *rounder;

    b0 = C1*row[1] + C3*row[3] + C5*row[5] + C7*row[7];
    b1 = C3*row[1] - C7*row[3] - C1*row[5] - C5*row[7];
    b2 = C5*row[1] - C1*row[3] + C7*row[5] + C3*row[7];
    b3 = C7*row[1] - C5*row[3] + C3*row[5] - C1*row[7];

    row[0] = (a0 + b0) >> ROW_SHIFT;
    row[1] = (a1 + b1) >> ROW_SHIFT;
    row[2] = (a2 + b2) >> ROW_SHIFT;
    row[3] = (a3 + b3) >> ROW_SHIFT;
    row[4] = (a3 - b3) >> ROW_SHIFT;
    row[5] = (a2 - b2) >> ROW_SHIFT;
    row[6] = (a1 - b1) >> ROW_SHIFT;
    row[7] = (a0 - b0) >> ROW_SHIFT;
}
#endif


/* MMXEXT row IDCT */

#define mmxext_table(c1,c2,c3,c4,c5,c6,c7)      {  c4,  c2, -c4, -c2,   \
                                                   c4,  c6,  c4,  c6,   \
                                                   c1,  c3, -c1, -c5,   \
                                                   c5,  c7,  c3, -c7,   \
                                                   c4, -c6,  c4, -c6,   \
                                                  -c4,  c2,  c4, -c2,   \
                                                   c5, -c1,  c3, -c1,   \
                                                   c7,  c3,  c7, -c5 }

static inline void mmxext_row_head (int16_t * row, int offset, const int16_t * table)
{
    movq_m2r (*(row+offset), mm2);      // mm2 = x6 x4 x2 x0

    movq_m2r (*(row+offset+4), mm5);    // mm5 = x7 x5 x3 x1
    movq_r2r (mm2, mm0);                // mm0 = x6 x4 x2 x0

    movq_m2r (*table, mm3);             // mm3 = -C2 -C4 C2 C4
    movq_r2r (mm5, mm6);                // mm6 = x7 x5 x3 x1

    movq_m2r (*(table+4), mm4);         // mm4 = C6 C4 C6 C4
    pmaddwd_r2r (mm0, mm3);             // mm3 = -C4*x4-C2*x6 C4*x0+C2*x2

    pshufw_r2r (mm2, mm2, 0x4e);        // mm2 = x2 x0 x6 x4
}

static inline void mmxext_row (const int16_t * table, const int32_t * rounder)
{
    movq_m2r (*(table+8), mm1);         // mm1 = -C5 -C1 C3 C1
    pmaddwd_r2r (mm2, mm4);             // mm4 = C4*x0+C6*x2 C4*x4+C6*x6

    pmaddwd_m2r (*(table+16), mm0);     // mm0 = C4*x4-C6*x6 C4*x0-C6*x2
    pshufw_r2r (mm6, mm6, 0x4e);        // mm6 = x3 x1 x7 x5

    movq_m2r (*(table+12), mm7);        // mm7 = -C7 C3 C7 C5
    pmaddwd_r2r (mm5, mm1);             // mm1 = -C1*x5-C5*x7 C1*x1+C3*x3

    paddd_m2r (*rounder, mm3);          // mm3 += rounder
    pmaddwd_r2r (mm6, mm7);             // mm7 = C3*x1-C7*x3 C5*x5+C7*x7

    pmaddwd_m2r (*(table+20), mm2);     // mm2 = C4*x0-C2*x2 -C4*x4+C2*x6
    paddd_r2r (mm4, mm3);               // mm3 = a1 a0 + rounder

    pmaddwd_m2r (*(table+24), mm5);     // mm5 = C3*x5-C1*x7 C5*x1-C1*x3
    movq_r2r (mm3, mm4);                // mm4 = a1 a0 + rounder

    pmaddwd_m2r (*(table+28), mm6);     // mm6 = C7*x1-C5*x3 C7*x5+C3*x7
    paddd_r2r (mm7, mm1);               // mm1 = b1 b0

    paddd_m2r (*rounder, mm0);          // mm0 += rounder
    psubd_r2r (mm1, mm3);               // mm3 = a1-b1 a0-b0 + rounder

    psrad_i2r (ROW_SHIFT, mm3);         // mm3 = y6 y7
    paddd_r2r (mm4, mm1);               // mm1 = a1+b1 a0+b0 + rounder

    paddd_r2r (mm2, mm0);               // mm0 = a3 a2 + rounder
    psrad_i2r (ROW_SHIFT, mm1);         // mm1 = y1 y0

    paddd_r2r (mm6, mm5);               // mm5 = b3 b2
    movq_r2r (mm0, mm4);                // mm4 = a3 a2 + rounder

    paddd_r2r (mm5, mm0);               // mm0 = a3+b3 a2+b2 + rounder
    psubd_r2r (mm5, mm4);               // mm4 = a3-b3 a2-b2 + rounder
}

static inline void mmxext_row_tail (int16_t * row, int store)
{
    psrad_i2r (ROW_SHIFT, mm0);         // mm0 = y3 y2

    psrad_i2r (ROW_SHIFT, mm4);         // mm4 = y4 y5

    packssdw_r2r (mm0, mm1);            // mm1 = y3 y2 y1 y0

    packssdw_r2r (mm3, mm4);            // mm4 = y6 y7 y4 y5

    movq_r2m (mm1, *(row+store));       // save y3 y2 y1 y0
    pshufw_r2r (mm4, mm4, 0xb1);        // mm4 = y7 y6 y5 y4

    /* slot */

    movq_r2m (mm4, *(row+store+4));     // save y7 y6 y5 y4
}

static inline void mmxext_row_mid (int16_t * row, int store,
                                   int offset, const int16_t * table)
{
    movq_m2r (*(row+offset), mm2);      // mm2 = x6 x4 x2 x0
    psrad_i2r (ROW_SHIFT, mm0);         // mm0 = y3 y2

    movq_m2r (*(row+offset+4), mm5);    // mm5 = x7 x5 x3 x1
    psrad_i2r (ROW_SHIFT, mm4);         // mm4 = y4 y5

    packssdw_r2r (mm0, mm1);            // mm1 = y3 y2 y1 y0
    movq_r2r (mm5, mm6);                // mm6 = x7 x5 x3 x1

    packssdw_r2r (mm3, mm4);            // mm4 = y6 y7 y4 y5
    movq_r2r (mm2, mm0);                // mm0 = x6 x4 x2 x0

    movq_r2m (mm1, *(row+store));       // save y3 y2 y1 y0
    pshufw_r2r (mm4, mm4, 0xb1);        // mm4 = y7 y6 y5 y4

    movq_m2r (*table, mm3);             // mm3 = -C2 -C4 C2 C4
    movq_r2m (mm4, *(row+store+4));     // save y7 y6 y5 y4

    pmaddwd_r2r (mm0, mm3);             // mm3 = -C4*x4-C2*x6 C4*x0+C2*x2

    movq_m2r (*(table+4), mm4);         // mm4 = C6 C4 C6 C4
    pshufw_r2r (mm2, mm2, 0x4e);        // mm2 = x2 x0 x6 x4
}


/* MMX row IDCT */

#define mmx_table(c1,c2,c3,c4,c5,c6,c7) {  c4,  c2,  c4,  c6,   \
                                           c4,  c6, -c4, -c2,   \
                                           c1,  c3,  c3, -c7,   \
                                           c5,  c7, -c1, -c5,   \
                                           c4, -c6,  c4, -c2,   \
                                          -c4,  c2,  c4, -c6,   \
                                           c5, -c1,  c7, -c5,   \
                                           c7,  c3,  c3, -c1 }

static inline void mmx_row_head (int16_t * row, int offset, const int16_t * table)
{
    movq_m2r (*(row+offset), mm2);      // mm2 = x6 x4 x2 x0

    movq_m2r (*(row+offset+4), mm5);    // mm5 = x7 x5 x3 x1
    movq_r2r (mm2, mm0);                // mm0 = x6 x4 x2 x0

    movq_m2r (*table, mm3);             // mm3 = C6 C4 C2 C4
    movq_r2r (mm5, mm6);                // mm6 = x7 x5 x3 x1

    punpckldq_r2r (mm0, mm0);           // mm0 = x2 x0 x2 x0

    movq_m2r (*(table+4), mm4);         // mm4 = -C2 -C4 C6 C4
    pmaddwd_r2r (mm0, mm3);             // mm3 = C4*x0+C6*x2 C4*x0+C2*x2

    movq_m2r (*(table+8), mm1);         // mm1 = -C7 C3 C3 C1
    punpckhdq_r2r (mm2, mm2);           // mm2 = x6 x4 x6 x4
}

static inline void mmx_row (const int16_t * table, const int32_t * rounder)
{
    pmaddwd_r2r (mm2, mm4);             // mm4 = -C4*x4-C2*x6 C4*x4+C6*x6
    punpckldq_r2r (mm5, mm5);           // mm5 = x3 x1 x3 x1

    pmaddwd_m2r (*(table+16), mm0);     // mm0 = C4*x0-C2*x2 C4*x0-C6*x2
    punpckhdq_r2r (mm6, mm6);           // mm6 = x7 x5 x7 x5

    movq_m2r (*(table+12), mm7);        // mm7 = -C5 -C1 C7 C5
    pmaddwd_r2r (mm5, mm1);             // mm1 = C3*x1-C7*x3 C1*x1+C3*x3

    paddd_m2r (*rounder, mm3);          // mm3 += rounder
    pmaddwd_r2r (mm6, mm7);             // mm7 = -C1*x5-C5*x7 C5*x5+C7*x7

    pmaddwd_m2r (*(table+20), mm2);     // mm2 = C4*x4-C6*x6 -C4*x4+C2*x6
    paddd_r2r (mm4, mm3);               // mm3 = a1 a0 + rounder

    pmaddwd_m2r (*(table+24), mm5);     // mm5 = C7*x1-C5*x3 C5*x1-C1*x3
    movq_r2r (mm3, mm4);                // mm4 = a1 a0 + rounder

    pmaddwd_m2r (*(table+28), mm6);     // mm6 = C3*x5-C1*x7 C7*x5+C3*x7
    paddd_r2r (mm7, mm1);               // mm1 = b1 b0

    paddd_m2r (*rounder, mm0);          // mm0 += rounder
    psubd_r2r (mm1, mm3);               // mm3 = a1-b1 a0-b0 + rounder

    psrad_i2r (ROW_SHIFT, mm3);         // mm3 = y6 y7
    paddd_r2r (mm4, mm1);               // mm1 = a1+b1 a0+b0 + rounder

    paddd_r2r (mm2, mm0);               // mm0 = a3 a2 + rounder
    psrad_i2r (ROW_SHIFT, mm1);         // mm1 = y1 y0

    paddd_r2r (mm6, mm5);               // mm5 = b3 b2
    movq_r2r (mm0, mm7);                // mm7 = a3 a2 + rounder

    paddd_r2r (mm5, mm0);               // mm0 = a3+b3 a2+b2 + rounder
    psubd_r2r (mm5, mm7);               // mm7 = a3-b3 a2-b2 + rounder
}

static inline void mmx_row_tail (int16_t * row, int store)
{
    psrad_i2r (ROW_SHIFT, mm0);         // mm0 = y3 y2

    psrad_i2r (ROW_SHIFT, mm7);         // mm7 = y4 y5

    packssdw_r2r (mm0, mm1);            // mm1 = y3 y2 y1 y0

    packssdw_r2r (mm3, mm7);            // mm7 = y6 y7 y4 y5

    movq_r2m (mm1, *(row+store));       // save y3 y2 y1 y0
    movq_r2r (mm7, mm4);                // mm4 = y6 y7 y4 y5

    pslld_i2r (16, mm7);                // mm7 = y7 0 y5 0

    psrld_i2r (16, mm4);                // mm4 = 0 y6 0 y4

    por_r2r (mm4, mm7);                 // mm7 = y7 y6 y5 y4

    /* slot */

    movq_r2m (mm7, *(row+store+4));     // save y7 y6 y5 y4
}

static inline void mmx_row_mid (int16_t * row, int store,
                                int offset, const int16_t * table)
{
    movq_m2r (*(row+offset), mm2);      // mm2 = x6 x4 x2 x0
    psrad_i2r (ROW_SHIFT, mm0);         // mm0 = y3 y2

    movq_m2r (*(row+offset+4), mm5);    // mm5 = x7 x5 x3 x1
    psrad_i2r (ROW_SHIFT, mm7);         // mm7 = y4 y5

    packssdw_r2r (mm0, mm1);            // mm1 = y3 y2 y1 y0
    movq_r2r (mm5, mm6);                // mm6 = x7 x5 x3 x1

    packssdw_r2r (mm3, mm7);            // mm7 = y6 y7 y4 y5
    movq_r2r (mm2, mm0);                // mm0 = x6 x4 x2 x0

    movq_r2m (mm1, *(row+store));       // save y3 y2 y1 y0
    movq_r2r (mm7, mm1);                // mm1 = y6 y7 y4 y5

    punpckldq_r2r (mm0, mm0);           // mm0 = x2 x0 x2 x0
    psrld_i2r (16, mm7);                // mm7 = 0 y6 0 y4