idct_mmx.c

基于linux的DVD播放器程序

    static short _T2[] ATTRIBUTE_ALIGNED(8) = {T2,T2,T2,T2};
    static short _T3[] ATTRIBUTE_ALIGNED(8) = {T3,T3,T3,T3};
    static short _C4[] ATTRIBUTE_ALIGNED(8) = {C4,C4,C4,C4};

    /* column code adapted from peter gubanov */
    /* http://www.elecard.com/peter/idct.shtml */

    movq_m2r (*_T1, mm0);		// mm0 = T1

    movq_m2r (*(col+offset+1*8), mm1);	// mm1 = x1
    movq_r2r (mm0, mm2);		// mm2 = T1

    movq_m2r (*(col+offset+7*8), mm4);	// mm4 = x7
    pmulhw_r2r (mm1, mm0);		// mm0 = T1*x1

    movq_m2r (*_T3, mm5);		// mm5 = T3
    pmulhw_r2r (mm4, mm2);		// mm2 = T1*x7

    movq_m2r (*(col+offset+5*8), mm6);	// mm6 = x5
    movq_r2r (mm5, mm7);		// mm7 = T3-1

    movq_m2r (*(col+offset+3*8), mm3);	// mm3 = x3
    psubsw_r2r (mm4, mm0);		// mm0 = v17

    movq_m2r (*_T2, mm4);		// mm4 = T2
    pmulhw_r2r (mm3, mm5);		// mm5 = (T3-1)*x3

    paddsw_r2r (mm2, mm1);		// mm1 = u17
    pmulhw_r2r (mm6, mm7);		// mm7 = (T3-1)*x5

    /* slot */

    movq_r2r (mm4, mm2);		// mm2 = T2
    paddsw_r2r (mm3, mm5);		// mm5 = T3*x3

    pmulhw_m2r (*(col+offset+2*8), mm4);// mm4 = T2*x2
    paddsw_r2r (mm6, mm7);		// mm7 = T3*x5

    psubsw_r2r (mm6, mm5);		// mm5 = v35
    paddsw_r2r (mm3, mm7);		// mm7 = u35

    movq_m2r (*(col+offset+6*8), mm3);	// mm3 = x6
    movq_r2r (mm0, mm6);		// mm6 = v17

    pmulhw_r2r (mm3, mm2);		// mm2 = T2*x6
    psubsw_r2r (mm5, mm0);		// mm0 = b3

    psubsw_r2r (mm3, mm4);		// mm4 = v26
    paddsw_r2r (mm6, mm5);		// mm5 = v12

    movq_r2m (mm0, *(col+offset+3*8));	// save b3 in scratch0
    movq_r2r (mm1, mm6);		// mm6 = u17

    paddsw_m2r (*(col+offset+2*8), mm2);// mm2 = u26
    paddsw_r2r (mm7, mm6);		// mm6 = b0

    psubsw_r2r (mm7, mm1);		// mm1 = u12
    movq_r2r (mm1, mm7);		// mm7 = u12

    movq_m2r (*(col+offset+0*8), mm3);	// mm3 = x0
    paddsw_r2r (mm5, mm1);		// mm1 = u12+v12

    movq_m2r (*_C4, mm0);		// mm0 = C4/2
    psubsw_r2r (mm5, mm7);		// mm7 = u12-v12

    movq_r2m (mm6, *(col+offset+5*8));	// save b0 in scratch1
    pmulhw_r2r (mm0, mm1);		// mm1 = b1/2

    movq_r2r (mm4, mm6);		// mm6 = v26
    pmulhw_r2r (mm0, mm7);		// mm7 = b2/2

    movq_m2r (*(col+offset+4*8), mm5);	// mm5 = x4
    movq_r2r (mm3, mm0);		// mm0 = x0

    psubsw_r2r (mm5, mm3);		// mm3 = v04
    paddsw_r2r (mm5, mm0);		// mm0 = u04

    paddsw_r2r (mm3, mm4);		// mm4 = a1
    movq_r2r (mm0, mm5);		// mm5 = u04

    psubsw_r2r (mm6, mm3);		// mm3 = a2
    paddsw_r2r (mm2, mm5);		// mm5 = a0

    paddsw_r2r (mm1, mm1);		// mm1 = b1
    psubsw_r2r (mm2, mm0);		// mm0 = a3

    paddsw_r2r (mm7, mm7);		// mm7 = b2
    movq_r2r (mm3, mm2);		// mm2 = a2

    movq_r2r (mm4, mm6);		// mm6 = a1
    paddsw_r2r (mm7, mm3);		// mm3 = a2+b2

    psraw_i2r (COL_SHIFT, mm3);		// mm3 = y2
    paddsw_r2r (mm1, mm4);		// mm4 = a1+b1

    psraw_i2r (COL_SHIFT, mm4);		// mm4 = y1
    psubsw_r2r (mm1, mm6);		// mm6 = a1-b1

    movq_m2r (*(col+offset+5*8), mm1);	// mm1 = b0
    psubsw_r2r (mm7, mm2);		// mm2 = a2-b2

    psraw_i2r (COL_SHIFT, mm6);		// mm6 = y6
    movq_r2r (mm5, mm7);		// mm7 = a0

    movq_r2m (mm4, *(col+offset+1*8));	// save y1
    psraw_i2r (COL_SHIFT, mm2);		// mm2 = y5

    movq_r2m (mm3, *(col+offset+2*8));	// save y2
    paddsw_r2r (mm1, mm5);		// mm5 = a0+b0

    movq_m2r (*(col+offset+3*8), mm4);	// mm4 = b3
    psubsw_r2r (mm1, mm7);		// mm7 = a0-b0

    psraw_i2r (COL_SHIFT, mm5);		// mm5 = y0
    movq_r2r (mm0, mm3);		// mm3 = a3

    movq_r2m (mm2, *(col+offset+5*8));	// save y5
    psubsw_r2r (mm4, mm3);		// mm3 = a3-b3

    psraw_i2r (COL_SHIFT, mm7);		// mm7 = y7
    paddsw_r2r (mm0, mm4);		// mm4 = a3+b3

    movq_r2m (mm5, *(col+offset+0*8));	// save y0
    psraw_i2r (COL_SHIFT, mm3);		// mm3 = y4

    movq_r2m (mm6, *(col+offset+6*8));	// save y6
    psraw_i2r (COL_SHIFT, mm4);		// mm4 = y3

    movq_r2m (mm7, *(col+offset+7*8));	// save y7

    movq_r2m (mm3, *(col+offset+4*8));	// save y4

    movq_r2m (mm4, *(col+offset+3*8));	// save y3
}


static int32_t rounder0[] ATTRIBUTE_ALIGNED(8) =
    rounder ((1 << (COL_SHIFT - 1)) - 0.5);
static int32_t rounder4[] ATTRIBUTE_ALIGNED(8) = rounder (0);
static int32_t rounder1[] ATTRIBUTE_ALIGNED(8) =
    rounder (1.25683487303);	/* C1*(C1/C4+C1+C7)/2 */
static int32_t rounder7[] ATTRIBUTE_ALIGNED(8) =
    rounder (-0.25);		/* C1*(C7/C4+C7-C1)/2 */
static int32_t rounder2[] ATTRIBUTE_ALIGNED(8) =
    rounder (0.60355339059);	/* C2 * (C6+C2)/2 */
static int32_t rounder6[] ATTRIBUTE_ALIGNED(8) =
    rounder (-0.25);		/* C2 * (C6-C2)/2 */
static int32_t rounder3[] ATTRIBUTE_ALIGNED(8) =
    rounder (0.087788325588);	/* C3*(-C3/C4+C3+C5)/2 */
static int32_t rounder5[] ATTRIBUTE_ALIGNED(8) =
    rounder (-0.441341716183);	/* C3*(-C5/C4+C5-C3)/2 */


#define declare_idct(idct,table,idct_row_head,idct_row,idct_row_tail,idct_row_mid)	\
static inline void idct (int16_t * block)				\
{									\
    static int16_t table04[] ATTRIBUTE_ALIGNED(16) =			\
	table (22725, 21407, 19266, 16384, 12873,  8867, 4520);		\
    static int16_t table17[] ATTRIBUTE_ALIGNED(16) =			\
	table (31521, 29692, 26722, 22725, 17855, 12299, 6270);		\
    static int16_t table26[] ATTRIBUTE_ALIGNED(16) =			\
	table (29692, 27969, 25172, 21407, 16819, 11585, 5906);		\
    static int16_t table35[] ATTRIBUTE_ALIGNED(16) =			\
	table (26722, 25172, 22654, 19266, 15137, 10426, 5315);		\
									\
    idct_row_head (block, 0*8, table04);				\
    idct_row (table04, rounder0);					\
    idct_row_mid (block, 0*8, 4*8, table04);				\
    idct_row (table04, rounder4);					\
    idct_row_mid (block, 4*8, 1*8, table17);				\
    idct_row (table17, rounder1);					\
    idct_row_mid (block, 1*8, 7*8, table17);				\
    idct_row (table17, rounder7);					\
    idct_row_mid (block, 7*8, 2*8, table26);				\
    idct_row (table26, rounder2);					\
    idct_row_mid (block, 2*8, 6*8, table26);				\
    idct_row (table26, rounder6);					\
    idct_row_mid (block, 6*8, 3*8, table35);				\
    idct_row (table35, rounder3);					\
    idct_row_mid (block, 3*8, 5*8, table35);				\
    idct_row (table35, rounder5);					\
    idct_row_tail (block, 5*8);						\
									\
    idct_col (block, 0);						\
    idct_col (block, 4);						\
}


#define COPY_MMX(offset,r0,r1,r2)	\
do {					\
    movq_m2r (*(block+offset), r0);	\
    dest += stride;			\
    movq_m2r (*(block+offset+4), r1);	\
    movq_r2m (r2, *dest);		\
    packuswb_r2r (r1, r0);		\
} while (0)

static void block_copy (int16_t * block, uint8_t * dest, int stride)
{
    movq_m2r (*(block+0*8), mm0);
    movq_m2r (*(block+0*8+4), mm1);
    movq_m2r (*(block+1*8), mm2);
    packuswb_r2r (mm1, mm0);
    movq_m2r (*(block+1*8+4), mm3);
    movq_r2m (mm0, *dest);
    packuswb_r2r (mm3, mm2);
    COPY_MMX (2*8, mm0, mm1, mm2);
    COPY_MMX (3*8, mm2, mm3, mm0);
    COPY_MMX (4*8, mm0, mm1, mm2);
    COPY_MMX (5*8, mm2, mm3, mm0);
    COPY_MMX (6*8, mm0, mm1, mm2);
    COPY_MMX (7*8, mm2, mm3, mm0);
    movq_r2m (mm2, *(dest+stride));
}


#define ADD_MMX(offset,r1,r2,r3,r4)	\
do {					\
    movq_m2r (*(dest+2*stride), r1);	\
    packuswb_r2r (r4, r3);		\
    movq_r2r (r1, r2);			\
    dest += stride;			\
    movq_r2m (r3, *dest);		\
    punpcklbw_r2r (mm0, r1);		\
    paddsw_m2r (*(block+offset), r1);	\
    punpckhbw_r2r (mm0, r2);		\
    paddsw_m2r (*(block+offset+4), r2);	\
} while (0)

static void block_add (int16_t * block, uint8_t * dest, int stride)
{
    movq_m2r (*dest, mm1);
    pxor_r2r (mm0, mm0);
    movq_m2r (*(dest+stride), mm3);
    movq_r2r (mm1, mm2);
    punpcklbw_r2r (mm0, mm1);
    movq_r2r (mm3, mm4);
    paddsw_m2r (*(block+0*8), mm1);
    punpckhbw_r2r (mm0, mm2);
    paddsw_m2r (*(block+0*8+4), mm2);
    punpcklbw_r2r (mm0, mm3);
    paddsw_m2r (*(block+1*8), mm3);
    packuswb_r2r (mm2, mm1);
    punpckhbw_r2r (mm0, mm4);
    movq_r2m (mm1, *dest);
    paddsw_m2r (*(block+1*8+4), mm4);
    ADD_MMX (2*8, mm1, mm2, mm3, mm4);
    ADD_MMX (3*8, mm3, mm4, mm1, mm2);
    ADD_MMX (4*8, mm1, mm2, mm3, mm4);
    ADD_MMX (5*8, mm3, mm4, mm1, mm2);
    ADD_MMX (6*8, mm1, mm2, mm3, mm4);
    ADD_MMX (7*8, mm3, mm4, mm1, mm2);
    packuswb_r2r (mm4, mm3);
    movq_r2m (mm3, *(dest+stride));
}


declare_idct (mmxext_idct, mmxext_table,
	      mmxext_row_head, mmxext_row, mmxext_row_tail, mmxext_row_mid)

void idct_block_copy_mmxext (int16_t * block, uint8_t * dest, int stride)
{
    mmxext_idct (block);
    block_copy (block, dest, stride);
}

void idct_block_add_mmxext (int16_t * block, uint8_t * dest, int stride)
{
    mmxext_idct (block);
    block_add (block, dest, stride);
}


declare_idct (mmx_idct, mmx_table,
	      mmx_row_head, mmx_row, mmx_row_tail, mmx_row_mid)

void idct_block_copy_mmx (int16_t * block, uint8_t * dest, int stride)
{
    mmx_idct (block);
    block_copy (block, dest, stride);
}

void idct_block_add_mmx (int16_t * block, uint8_t * dest, int stride)
{
    mmx_idct (block);
    block_add (block, dest, stride);
}