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