/* * idct for sh4 * * Copyright (c) 2001-2003 BERO * * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavcodec/dsputil.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 #if 1 #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") #else /* generic C code for check */ static void ftrv_(const float xf[],float fv[]) { float f0,f1,f2,f3; f0 = fv[0]; f1 = fv[1]; f2 = fv[2]; f3 = fv[3]; fv[0] = xf[0]*f0 + xf[4]*f1 + xf[ 8]*f2 + xf[12]*f3; fv[1] = xf[1]*f0 + xf[5]*f1 + xf[ 9]*f2 + xf[13]*f3; fv[2] = xf[2]*f0 + xf[6]*f1 + xf[10]*f2 + xf[14]*f3; fv[3] = xf[3]*f0 + xf[7]*f1 + xf[11]*f2 + xf[15]*f3; } static void load_matrix_(float xf[],const float table[]) { int i; for(i=0;i<16;i++) xf[i]=table[i]; } #define ftrv() ftrv_(xf,fv) #define load_matrix(table) load_matrix_(xf,table) #define DEFREG \ float fv[4],xf[16] #define fr0 fv[0] #define fr1 fv[1] #define fr2 fv[2] #define fr3 fv[3] #endif #if 1 #define DESCALE(x,n) (x)*(1.0f/(1<<(n))) #else #define DESCALE(x,n) (((int)(x)+(1<<(n-1)))>>(n)) #endif /* this code work worse on gcc cvs. 3.2.3 work fine */ #if 1 //optimized void idct_sh4(DCTELEM *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); } #else void idct_sh4(DCTELEM *block) { DEFREG; int i; float tblock[8*8],*fblock; /* row */ /* even part */ load_matrix(even_table); fblock = tblock; i = 8; do { fr0 = block[0]; fr1 = block[2]; fr2 = block[4]; fr3 = block[6]; block+=8; ftrv(); fblock[0] = fr0; fblock[2] = fr1; fblock[4] = fr2; fblock[6] = fr3; fblock+=8; } while(--i); block-=8*8; fblock-=8*8; 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[0]; t1 = fblock[2]; t2 = fblock[4]; t3 = fblock[6]; fblock[0] = t0 + fr0; fblock[7] = t0 - fr0; fblock[1] = t1 + fr1; fblock[6] = t1 - fr1; fblock[2] = t2 + fr2; fblock[5] = t2 - fr2; fblock[3] = t3 + fr3; fblock[4] = t3 - fr3; fblock+=8; } while(--i); block-=8*8; fblock-=8*8; /* col */ /* even part */ load_matrix(even_table); i = 8; do { fr0 = fblock[8*0]; fr1 = fblock[8*2]; fr2 = fblock[8*4]; fr3 = fblock[8*6]; ftrv(); fblock[8*0] = fr0; fblock[8*2] = fr1; fblock[8*4] = fr2; fblock[8*6] = fr3; fblock++; } while(--i); fblock-=8; load_matrix(odd_table); i=8; do { float t0,t1,t2,t3; fr0 = fblock[8*1]; fr1 = fblock[8*3]; fr2 = fblock[8*5]; fr3 = fblock[8*7]; ftrv(); t0 = fblock[8*0]; t1 = fblock[8*2]; t2 = fblock[8*4]; t3 = fblock[8*6]; fblock++; 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); } #endif