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/*
Originally provided by Intel at AP-922
http://developer.intel.com/vtune/cbts/strmsimd/922down.htm
(See more app notes at http://developer.intel.com/vtune/cbts/strmsimd/appnotes.htm)
but in a limited edition.
column code adapted from peter gubanov
Copyright (c) 2000-2001 Peter Gubanov <peter@elecard.net.ru>
http://www.elecard.com/peter/idct.shtml
Rounding trick Copyright (c) 2000 Michel Lespinasse <walken@zoy.org>
mmi port by leonvs@iae.nl
*/
#include "../common.h"
#include "mmi.h"
#define BITS_INV_ACC 5 // 4 or 5 for IEEE
#define SHIFT_INV_ROW (16 - BITS_INV_ACC)
#define SHIFT_INV_COL (BITS_INV_ACC) //(1 + BITS_INV_ACC) no, FP15 is used
#define Rounder_0 0
#define Rounder_1 16
#define Rounder_2 32
#define Rounder_3 48
#define Rounder_4 64
#define Rounder_5 80
#define Rounder_6 96
#define Rounder_7 112
// assume SHIFT_INV_ROW == 11
static int roundertable[8][4] align16 = {
{65535, 65535, 65535, 65535},
{ 1023, 1023, 1023, 1023},
{ 1023, 1023, 1023, 1023},
{ 1023, 1023, 1023, 1023},
{ 0, 0, 0, 0},
{ 1023, 1023, 1023, 1023},
{ 1023, 1023, 1023, 1023},
{ 1023, 1023, 1023, 1023}
};
#define TAB_i_04 0
#define TAB_i_17 64
#define TAB_i_26 128
#define TAB_i_35 192
static short rowtable[4][32] align16 = {
{
16384, 16384, 22725, 12873, 21407, 8867, 19266, 4520,
16384, -16383, 19266, -22724, 8867, -21406, -4519, -12872,
16384, -16383, 12873, 4520, -8866, 21407, -22724, 19266,
16384, 16384, 4520, 19266, -21406, -8866, -12872, -22724},
{
22725, 22725, 31521, 17855, 29692, 12299, 26722, 6270,
22725, -22724, 26722, -31520, 12299, -29691, -6269, -17854,
22725, -22724, 17855, 6270, -12298, 29692, -31520, 26722,
22725, 22725, 6270, 26722, -29691, -12298, -17854, -31520},
{
21407, 21407, 29692, 16819, 27969, 11585, 25172, 5906,
21407, -21406, 25172, -29691, 11585, -27968, -5905, -16818,
21407, -21406, 16819, 5906, -11584, 27969, -29691, 25172,
21407, 21407, 5906, 25172, -27968, -11584, -16818, -29691},
{
19266, 19266, 26722, 15137, 25172, 10426, 22654, 5315,
19266, -19265, 22654, -26721, 10426, -25171, -5314, -15136,
19266, -19265, 15137, 5315, -10425, 25172, -26721, 22654,
19266, 19266, 5315, 22654, -25171, -10425, -15136, -26721}
};
#define TG_3_16_minus_one 0
#define ONE_plus_tg_3_16 16
#define ONE_plus_tg_1_16 32
#define TG_1_16_minus_one 48
#define TG_2_16_minus_one 64
#define ONE_plus_tg_2_16 80
#define ZERO_ocos_4_16 96
#define TG1 6518
#define TG2 13573
#define TG3 21895
#define MN1 -32768
#define PL1 32768
#define CS4 23170
static short coltable[7][8] align16 = {
{ MN1, TG3, MN1, TG3, MN1, TG3, MN1, TG3},
{-TG3, -PL1, -TG3, -PL1, -TG3, -PL1, -TG3, -PL1},
{-TG1, -PL1, -TG1, -PL1, -TG1, -PL1, -TG1, -PL1},
{ MN1, TG1, MN1, TG1, MN1, TG1, MN1, TG1},
{ MN1, TG2, MN1, TG2, MN1, TG2, MN1, TG2},
{-TG2, -PL1, -TG2, -PL1, -TG2, -PL1, -TG2, -PL1},
{ CS4, 0, CS4, 0, CS4, 0, CS4, 0}
};
#define noprevh(rt, rd)
#define DCT_8_INV_ROW1(rowoff, taboff, rounder, outreg) { \
\
lq($4, rowoff, $16); /* r16 = x7 x6 x5 x4 x3 x2 x1 x0 */ \
lq($24, 0+taboff, $17); /* r17 = w19 w17 w3 w1 w18 w16 w2 w0 */ \
pinth($16, $16, $16); /* r16 = x7 x3 x6 x2 x5 x1 x4 x0 */ \
phmadh($17, $16, $17); /* r17 = (x7*w19+x3*w17)b0'' (x6*w3+x2*w1)a0'' (x5*w18+x1*w16)b0' (x4*w2+x0*w0)a0' */ \
lq($24, 16+taboff, $18);/* r18 = w23 w21 w7 w5 w22 w20 w6 w4 */ \
lq($24, 32+taboff, $19);/* r19 = w27 w25 w11 w9 w26 w24 w10 w8 */ \
lq($24, 48+taboff, $20);/* r20 = w31 w29 w15 w13 w30 w28 w14 w12 */ \
phmadh($18, $16, $18); /* r18 = (b1'')(a1'')(b1')(a1') */ \
pcpyud($17, $17, $21); /* r21 = (b0'')(a0'')(b0'')(a0'') */ \
paddw($17, $21, $17); /* r17 = (--)(--)(b0)(a0) */ \
phmadh($19, $16, $19); /* r19 = (b2'')(a2'')(b2')(a2') */ \
pcpyud($18, $18, $21); /* r21 = (b1'')(a1'')(b1'')(a1'') */ \
paddw($18, $21, $18); /* r18 = (--)(--)(b1)(a1) */ \
pcpyud($19, $19, $21); \
phmadh($20, $16, $20); /* r12 = (b3'')(a3'')(b3')(a3') */ \
lq($7, rounder, $22); /* r22 = rounder */ \
paddw($19, $21, $19); /* r19 = (--)(--)(b2)(a2) */ \
pextlw($19, $17, $16); /* r16 = (b2)(b0)(a2)(a0) */ \
pcpyud($20, $20, $21); \
paddw($20, $21, $20); /* r20 = (--)(--)(b3)(a3) */ \
pextlw($20, $18, $17); /* r17 = (b3)(b1)(a3)(a1) */ \
pextlw($17, $16, $20); /* r20 = (a3)(a2)(a1)(a0)" */ \
pextuw($17, $16, $21); /* r21 = (b3)(b2)(b1)(b0) */ \
paddw($20, $22, $20); /* r20 = (a3)(a2)(a1)(a0) */\
paddw($20, $21, $17); /* r17 = ()()()(a0+b0) */ \
psubw($20, $21, $18); /* r18 = ()()()(a0-b0) */ \
psraw($17, SHIFT_INV_ROW, $17); /* r17 = (y3 y2 y1 y0) */ \
psraw($18, SHIFT_INV_ROW, $18); /* r18 = (y4 y5 y6 y7) */ \
ppach($18, $17, outreg);/* out = y4 y5 y6 y7 y3 y2 y1 y0 Note order */ \
}
#define DCT_8_INV_COL4(pextop, blkoff, revop) { \
lq($24, TG_3_16_minus_one, $2); /* r2 = (tn3)(-1) x 4 */ \
pextop($11, $13, $3); /* r3 = (x3)(x5) x 4 */ \
lq($24, ONE_plus_tg_3_16, $16); /* r16 = -((+1)(tn3)) x 4 */ \
phmadh($3, $2, $17); /* r17 = (tm35) x 4 */ \
lq($24, ONE_plus_tg_1_16, $2); /* r2 = -((+1)(tn1)) x 4 */ \
phmadh($3, $16, $18); /* r18 = -(tp35) x 4 */ \
lq($24, TG_1_16_minus_one, $16);/* r16 = (tn1)(-1) x 4 */ \
pextop($9, $15, $3); /* r3 = (x1)(x7) x 4 */ \
phmadh($3, $2, $19); \
lq($24, ZERO_ocos_4_16, $2); /* r2 = (0)(cos4) x 4 */ \
phmadh($3, $16, $20); /* r20 = (tm17) x 4 */ \
psubw($0, $19, $19); /* r19 = (tp17) x 4 */ \
paddw($19, $18, $3); /* r3 = t1 */ \
paddw($20, $17, $16); /* r16 = t2 */ \
psubw($20, $17, $23); /* r23 = b3 */ \
psubw($19, $18, $20); /* r20 = b0 */ \
paddw($3, $16, $17); /* (t1+t2) */ \
psubw($3, $16, $18); /* (t1-t2) */ \
psraw($17, 15, $17); \
lq($24, TG_2_16_minus_one, $3); /* r3 = (tn2)(-1) x 4 */ \
pmulth($17, $2, $21); /* r21 = b1 */ \
psraw($18, 15, $18); \
lq($24, ONE_plus_tg_2_16, $16); /* r16 = -((+1)(tn2)) x 4 */ \
pmulth($18, $2, $22); /* r22 = b2 */ \
\
pextop($10, $14, $2); /* r2 = (x2)(x6) x 4 */ \
phmadh($2, $3, $18); /* r18 = (tm26) x 4 */ \
phmadh($2, $16, $19); /* r19 = -(tp26) x 4 */ \
pextop($8, $0, $17); /* r17 = (x0)(0) x 4 */ \
psraw($17, 1, $17); \
pextop($12, $0, $16); /* r16 = (x4)(0) x 4 */ \
psraw($16, 1, $16); \
paddw($17, $16, $2); /* r2 = tp04 */ \
psubw($17, $16, $3); /* r3 = tm04 */ \
psubw($2, $19, $16); /* r16 = a0 */ \
paddw($3, $18, $17); /* r17 = a1 */ \
psubw($3, $18, $18); /* r18 = a2 */ \
paddw($2, $19, $19); /* r19 = a3 */ \
\
paddw($16, $20, $2); /* y0 a0+b0 */ \
psubw($16, $20, $16); /* y7 a0-b0 */ \
psraw($2, SHIFT_INV_COL+16, $2); \
psraw($16, SHIFT_INV_COL+16, $16); \
ppach($0, $2, $2); \
ppach($0, $16, $16); \
revop($2, $2); \
revop($16, $16); \
sd3(2, 0+blkoff, 4); \
sd3(16, 112+blkoff, 4); \
\
paddw($17, $21, $3); /* y1 a1+b1 */ \
psubw($17, $21, $17); /* y6 a1-b1 */ \
psraw($3, SHIFT_INV_COL+16, $3); \
psraw($17, SHIFT_INV_COL+16, $17); \
ppach($0, $3, $3); \
ppach($0, $17, $17); \
revop($3, $3); \
revop($17, $17); \
sd3(3, 16+blkoff, 4); \
sd3(17, 96+blkoff, 4); \
\
paddw($18, $22, $2); /* y2 a2+b2 */ \
psubw($18, $22, $18); /* y5 a2-b2 */ \
psraw($2, SHIFT_INV_COL+16, $2); \
psraw($18, SHIFT_INV_COL+16, $18); \
ppach($0, $2, $2); \
ppach($0, $18, $18); \
revop($2, $2); \
revop($18, $18); \
sd3(2, 32+blkoff, 4); \
sd3(18, 80+blkoff, 4); \
\
paddw($19, $23, $3); /* y3 a3+b3 */ \
psubw($19, $23, $19); /* y4 a3-b3 */ \
psraw($3, SHIFT_INV_COL+16, $3); \
psraw($19, SHIFT_INV_COL+16, $19); \
ppach($0, $3, $3); \
ppach($0, $19, $19); \
revop($3, $3); \
revop($19, $19); \
sd3(3, 48+blkoff, 4); \
sd3(19, 64+blkoff, 4); \
}
void ff_mmi_idct(int16_t * block)
{
/* $4 = block */
__asm__ __volatile__("la $24, %0"::"m"(rowtable[0][0]));
__asm__ __volatile__("la $7, %0"::"m"(roundertable[0][0]));
DCT_8_INV_ROW1(0, TAB_i_04, Rounder_0, $8);
DCT_8_INV_ROW1(16, TAB_i_17, Rounder_1, $9);
DCT_8_INV_ROW1(32, TAB_i_26, Rounder_2, $10);
DCT_8_INV_ROW1(48, TAB_i_35, Rounder_3, $11);
DCT_8_INV_ROW1(64, TAB_i_04, Rounder_4, $12);
DCT_8_INV_ROW1(80, TAB_i_35, Rounder_5, $13);
DCT_8_INV_ROW1(96, TAB_i_26, Rounder_6, $14);
DCT_8_INV_ROW1(112, TAB_i_17, Rounder_7, $15);
__asm__ __volatile__("la $24, %0"::"m"(coltable[0][0]));
DCT_8_INV_COL4(pextlh, 0, noprevh);
DCT_8_INV_COL4(pextuh, 8, prevh);
//let savedtemp regs be saved
__asm__ __volatile__(" ":::"$16", "$17", "$18", "$19", "$20", "$21",
"$22", "$23");
}
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