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/*
* idct for sh4
*
* Copyright (c) 2001-2003 BERO <bero@geocities.co.jp>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "dsputil_sh4.h"
#include "sh4.h"
#define c1 1.38703984532214752434 /* sqrt(2)*cos(1*pi/16) */
#define c2 1.30656296487637657577 /* sqrt(2)*cos(2*pi/16) */
#define c3 1.17587560241935884520 /* sqrt(2)*cos(3*pi/16) */
#define c4 1.00000000000000000000 /* sqrt(2)*cos(4*pi/16) */
#define c5 0.78569495838710234903 /* sqrt(2)*cos(5*pi/16) */
#define c6 0.54119610014619712324 /* sqrt(2)*cos(6*pi/16) */
#define c7 0.27589937928294311353 /* sqrt(2)*cos(7*pi/16) */
static const float even_table[] __attribute__ ((aligned(8))) = {
c4, c4, c4, c4,
c2, c6,-c6,-c2,
c4,-c4,-c4, c4,
c6,-c2, c2,-c6
};
static const float odd_table[] __attribute__ ((aligned(8))) = {
c1, c3, c5, c7,
c3,-c7,-c1,-c5,
c5,-c1, c7, c3,
c7,-c5, c3,-c1
};
#undef c1
#undef c2
#undef c3
#undef c4
#undef c5
#undef c6
#undef c7
#define load_matrix(table) \
do { \
const float *t = table; \
__asm__ volatile( \
" fschg\n" \
" fmov @%0+,xd0\n" \
" fmov @%0+,xd2\n" \
" fmov @%0+,xd4\n" \
" fmov @%0+,xd6\n" \
" fmov @%0+,xd8\n" \
" fmov @%0+,xd10\n" \
" fmov @%0+,xd12\n" \
" fmov @%0+,xd14\n" \
" fschg\n" \
: "+r"(t) \
); \
} while (0)
#define ftrv() \
__asm__ volatile("ftrv xmtrx,fv0" \
: "+f"(fr0),"+f"(fr1),"+f"(fr2),"+f"(fr3));
#define DEFREG \
register float fr0 __asm__("fr0"); \
register float fr1 __asm__("fr1"); \
register float fr2 __asm__("fr2"); \
register float fr3 __asm__("fr3")
#define DESCALE(x,n) (x)*(1.0f/(1<<(n)))
/* this code work worse on gcc cvs. 3.2.3 work fine */
//optimized
void ff_idct_sh4(int16_t *block)
{
DEFREG;
int i;
float tblock[8*8],*fblock;
int ofs1,ofs2,ofs3;
int fpscr;
fp_single_enter(fpscr);
/* row */
/* even part */
load_matrix(even_table);
fblock = tblock+4;
i = 8;
do {
fr0 = block[0];
fr1 = block[2];
fr2 = block[4];
fr3 = block[6];
block+=8;
ftrv();
*--fblock = fr3;
*--fblock = fr2;
*--fblock = fr1;
*--fblock = fr0;
fblock+=8+4;
} while(--i);
block-=8*8;
fblock-=8*8+4;
load_matrix(odd_table);
i = 8;
do {
float t0,t1,t2,t3;
fr0 = block[1];
fr1 = block[3];
fr2 = block[5];
fr3 = block[7];
block+=8;
ftrv();
t0 = *fblock++;
t1 = *fblock++;
t2 = *fblock++;
t3 = *fblock++;
fblock+=4;
*--fblock = t0 - fr0;
*--fblock = t1 - fr1;
*--fblock = t2 - fr2;
*--fblock = t3 - fr3;
*--fblock = t3 + fr3;
*--fblock = t2 + fr2;
*--fblock = t1 + fr1;
*--fblock = t0 + fr0;
fblock+=8;
} while(--i);
block-=8*8;
fblock-=8*8;
/* col */
/* even part */
load_matrix(even_table);
ofs1 = sizeof(float)*2*8;
ofs2 = sizeof(float)*4*8;
ofs3 = sizeof(float)*6*8;
i = 8;
#define OA(fblock,ofs) *(float*)((char*)fblock + ofs)
do {
fr0 = OA(fblock, 0);
fr1 = OA(fblock,ofs1);
fr2 = OA(fblock,ofs2);
fr3 = OA(fblock,ofs3);
ftrv();
OA(fblock,0 ) = fr0;
OA(fblock,ofs1) = fr1;
OA(fblock,ofs2) = fr2;
OA(fblock,ofs3) = fr3;
fblock++;
} while(--i);
fblock-=8;
load_matrix(odd_table);
i=8;
do {
float t0,t1,t2,t3;
t0 = OA(fblock, 0); /* [8*0] */
t1 = OA(fblock,ofs1); /* [8*2] */
t2 = OA(fblock,ofs2); /* [8*4] */
t3 = OA(fblock,ofs3); /* [8*6] */
fblock+=8;
fr0 = OA(fblock, 0); /* [8*1] */
fr1 = OA(fblock,ofs1); /* [8*3] */
fr2 = OA(fblock,ofs2); /* [8*5] */
fr3 = OA(fblock,ofs3); /* [8*7] */
fblock+=-8+1;
ftrv();
block[8*0] = DESCALE(t0 + fr0,3);
block[8*7] = DESCALE(t0 - fr0,3);
block[8*1] = DESCALE(t1 + fr1,3);
block[8*6] = DESCALE(t1 - fr1,3);
block[8*2] = DESCALE(t2 + fr2,3);
block[8*5] = DESCALE(t2 - fr2,3);
block[8*3] = DESCALE(t3 + fr3,3);
block[8*4] = DESCALE(t3 - fr3,3);
block++;
} while(--i);
fp_single_leave(fpscr);
}
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