/*
dct64_altivec.c: Discrete Cosine Tansform (DCT) for Altivec
copyright ?-2006 by the mpg123 project - free software under the terms of the LGPL 2.1
see COPYING and AUTHORS files in distribution or http://mpg123.org
initially written by Michael Hipp
altivec optimization by tmkk
*/
/*
* Discrete Cosine Tansform (DCT) for subband synthesis
*
* -funroll-loops (for gcc) will remove the loops for better performance
* using loops in the source-code enhances readabillity
*
*
* TODO: write an optimized version for the down-sampling modes
* (in these modes the bands 16-31 (2:1) or 8-31 (4:1) are zero
*/
#include "mpg123lib_intern.h"
#ifndef __APPLE__
#include <altivec.h>
#endif
void dct64_altivec(real *out0,real *out1,real *samples)
{
ALIGNED(16) real bufs[32];
{
register real *b1,*costab;
vector unsigned char vinvert,vperm1,vperm2,vperm3,vperm4;
vector float v1,v2,v3,v4,v5,v6,v7,v8;
vector float vbs1,vbs2,vbs3,vbs4,vbs5,vbs6,vbs7,vbs8;
vector float vbs9,vbs10,vbs11,vbs12,vbs13,vbs14,vbs15,vbs16;
vector float vzero;
b1 = samples;
costab = pnts[0];
vzero = vec_xor(vzero,vzero);
#ifdef __APPLE__
vinvert = (vector unsigned char)(12,13,14,15,8,9,10,11,4,5,6,7,0,1,2,3);
#else
vinvert = (vector unsigned char){12,13,14,15,8,9,10,11,4,5,6,7,0,1,2,3};
#endif
vperm1 = vec_lvsl(0,b1);
vperm2 = vec_perm(vperm1,vperm1,vinvert);
v1 = vec_ld(0,b1);
v2 = vec_ld(16,b1);
v3 = vec_ld(112,b1);
v4 = vec_ld(127,b1);
v5 = vec_perm(v1,v2,vperm1); /* b1[0,1,2,3] */
v6 = vec_perm(v3,v4,vperm2); /* b1[31,30,29,28] */
vbs1 = vec_add(v5,v6);
vbs8 = vec_sub(v5,v6);
v1 = vec_ld(32,b1);
v4 = vec_ld(96,b1);
v5 = vec_perm(v2,v1,vperm1); /* b1[4,5,6,7] */
v6 = vec_perm(v4,v3,vperm2); /* b1[27,26,25,24] */
vbs2 = vec_add(v5,v6);
vbs7 = vec_sub(v5,v6);
v2 = vec_ld(48,b1);
v3 = vec_ld(80,b1);
v5 = vec_perm(v1,v2,vperm1); /* b1[8,9,10,11] */
v6 = vec_perm(v3,v4,vperm2); /* b1[23,22,21,20] */
vbs3 = vec_add(v5,v6);
vbs6 = vec_sub(v5,v6);
v1 = vec_ld(64,b1);
v5 = vec_perm(v2,v1,vperm1); /* b1[12,13,14,15] */
v6 = vec_perm(v1,v3,vperm2); /* b1[19,18,17,16] */
vbs4 = vec_add(v5,v6);
vbs5 = vec_sub(v5,v6);
v1 = vec_ld(0,costab);
vbs8 = vec_madd(vbs8,v1,vzero);
v2 = vec_ld(16,costab);
vbs7 = vec_madd(vbs7,v2,vzero);
v3 = vec_ld(32,costab);
vbs6 = vec_madd(vbs6,v3,vzero);
v4 = vec_ld(48,costab);
vbs5 = vec_madd(vbs5,v4,vzero);
vbs6 = vec_perm(vbs6,vbs6,vinvert);
vbs5 = vec_perm(vbs5,vbs5,vinvert);
costab = pnts[1];
v1 = vec_perm(vbs4,vbs4,vinvert);
vbs9 = vec_add(vbs1,v1);
v3 = vec_sub(vbs1,v1);
v5 = vec_ld(0,costab);
v2 = vec_perm(vbs3,vbs3,vinvert);
vbs10 = vec_add(vbs2,v2);
v4 = vec_sub(vbs2,v2);
v6 = vec_ld(16,costab);
vbs12 = vec_madd(v3,v5,vzero);
vbs11 = vec_madd(v4,v6,vzero);
v7 = vec_sub(vbs7,vbs6);
v8 = vec_sub(vbs8,vbs5);
vbs13 = vec_add(vbs5,vbs8);
vbs14 = vec_add(vbs6,vbs7);
vbs15 = vec_madd(v7,v6,vzero);
vbs16 = vec_madd(v8,v5,vzero);
costab = pnts[2];
v1 = vec_perm(vbs10,vbs10,vinvert);
v5 = vec_perm(vbs14,vbs14,vinvert);
vbs1 = vec_add(v1,vbs9);
vbs5 = vec_add(v5,vbs13);
v2 = vec_sub(vbs9,v1);
v6 = vec_sub(vbs13,v5);
v3 = vec_ld(0,costab);
vbs11 = vec_perm(vbs11,vbs11,vinvert);
vbs15 = vec_perm(vbs15,vbs15,vinvert);
vbs3 = vec_add(vbs11,vbs12);
vbs7 = vec_add(vbs15,vbs16);
v4 = vec_sub(vbs12,vbs11);
v7 = vec_sub(vbs16,vbs15);
vbs2 = vec_madd(v2,v3,vzero);
vbs4 = vec_madd(v4,v3,vzero);
vbs6 = vec_madd(v6,v3,vzero);
vbs8 = vec_madd(v7,v3,vzero);
vbs2 = vec_perm(vbs2,vbs2,vinvert);
vbs4 = vec_perm(vbs4,vbs4,vinvert);
vbs6 = vec_perm(vbs6,vbs6,vinvert);
vbs8 = vec_perm(vbs8,vbs8,vinvert);
costab = pnts[3];
#ifdef __APPLE__
vperm1 = (vector unsigned char)(0,1,2,3,4,5,6,7,16,17,18,19,20,21,22,23);
vperm2 = (vector unsigned char)(12,13,14,15,8,9,10,11,28,29,30,31,24,25,26,27);
vperm3 = (vector unsigned char)(0,1,2,3,4,5,6,7,20,21,22,23,16,17,18,19);
#else
vperm1 = (vector unsigned char){0,1,2,3,4,5,6,7,16,17,18,19,20,21,22,23};
vperm2 = (vector unsigned char){12,13,14,15,8,9,10,11,28,29,30,31,24,25,26,27};
vperm3 = (vector unsigned char){0,1,2,3,4,5,6,7,20,21,22,23,16,17,18,19};
#endif
vperm4 = vec_add(vperm3,vec_splat_u8(8));
v1 = vec_ld(0,costab);
v2 = vec_splat(v1,0);
v3 = vec_splat(v1,1);
v1 = vec_mergeh(v2,v3);
v2 = vec_perm(vbs1,vbs3,vperm1);
v3 = vec_perm(vbs2,vbs4,vperm1);
v4 = vec_perm(vbs1,vbs3,vperm2);
v5 = vec_perm(vbs2,vbs4,vperm2);
v6 = vec_sub(v2,v4);
v7 = vec_sub(v3,v5);
v2 = vec_add(v2,v4);
v3 = vec_add(v3,v5);
v4 = vec_madd(v6,v1,vzero);
v5 = vec_nmsub(v7,v1,vzero);
vbs9 = vec_perm(v2,v4,vperm3);
vbs11 = vec_perm(v2,v4,vperm4);
vbs10 = vec_perm(v3,v5,vperm3);
vbs12 = vec_perm(v3,v5,vperm4);
v2 = vec_perm(vbs5,vbs7,vperm1);
v3 = vec_perm(vbs6,vbs8,vperm1);
v4 = vec_perm(vbs5,vbs7,vperm2);
v5 = vec_perm(vbs6,vbs8,vperm2);
v6 = vec_sub(v2,v4);
v7 = vec_sub(v3,v5);
v2 = vec_add(v2,v4);
v3 = vec_add(v3,v5);
v4 = vec_madd(v6,v1,vzero);
v5 = vec_nmsub(v7,v1,vzero);
vbs13 = vec_perm(v2,v4,vperm3);
vbs15 = vec_perm(v2,v4,vperm4);
vbs14 = vec_perm(v3,v5,vperm3);
vbs16 = vec_perm(v3,v5,vperm4);
costab = pnts[4];
v1 = vec_lde(0,costab);
#ifdef __APPLE__
v2 = (vector float)(1.0f,-1.0f,1.0f,-1.0f);
#else
v2 = (vector float){1.0f,-1.0f,1.0f,-1.0f};
#endif
v3 = vec_splat(v1,0);
v1 = vec_madd(v2,v3,vzero);
v2 = vec_mergeh(vbs9,vbs10);
v3 = vec_mergel(vbs9,vbs10);
v4 = vec_mergeh(vbs11,vbs12);
v5 = vec_mergel(vbs11,vbs12);
v6 = vec_mergeh(v2,v3);
v7 = vec_mergel(v2,v3);
v2 = vec_mergeh(v4,v5);
v3 = vec_mergel(v4,v5);
v4 = vec_sub(v6,v7);
v5 = vec_sub(v2,v3);
v6 = vec_add(v6,v7);
v7 = vec_add(v2,v3);
v2 = vec_madd(v4,v1,vzero);
v3 = vec_madd(v5,v1,vzero);
vbs1 = vec_mergeh(v6,v2);
vbs2 = vec_mergel(v6,v2);
vbs3 = vec_mergeh(v7,v3);
vbs4 = vec_mergel(v7,v3);
v2 = vec_mergeh(vbs13,vbs14);
v3 = vec_mergel(vbs13,vbs14);
v4 = vec_mergeh(vbs15,vbs16);
v5 = vec_mergel(vbs15,vbs16);
v6 = vec_mergeh(v2,v3);
v7 = vec_mergel(v2,v3);
v2 = vec_mergeh(v4,v5);
v3 = vec_mergel(v4,v5);
v4 = vec_sub(v6,v7);
v5 = vec_sub(v2,v3);
v6 = vec_add(v6,v7);
v7 = vec_add(v2,v3);
v2 = vec_madd(v4,v1,vzero);
v3 = vec_madd(v5,v1,vzero);
vbs5 = vec_mergeh(v6,v2);
vbs6 = vec_mergel(v6,v2);
vbs7 = vec_mergeh(v7,v3);
vbs8 = vec_mergel(v7,v3);
vec_st(vbs1,0,bufs);
vec_st(vbs2,16,bufs);
vec_st(vbs3,32,bufs);
vec_st(vbs4,48,bufs);
vec_st(vbs5,64,bufs);
vec_st(vbs6,80,bufs);
vec_st(vbs7,96,bufs);
vec_st(vbs8,112,bufs);
}
{
register real *b1;
register int i;
for(b1=bufs,i=8;i;i--,b1+=4)
b1[2] += b1[3];
for(b1=bufs,i=4;i;i--,b1+=8)
{
b1[4] += b1[6];
b1[6] += b1[5];
b1[5] += b1[7];
}
for(b1=bufs,i=2;i;i--,b1+=16)
{
b1[8] += b1[12];
b1[12] += b1[10];
b1[10] += b1[14];
b1[14] += b1[9];
b1[9] += b1[13];
b1[13] += b1[11];
b1[11] += b1[15];
}
}
out0[0x10*16] = bufs[0];
out0[0x10*15] = bufs[16+0] + bufs[16+8];
out0[0x10*14] = bufs[8];
out0[0x10*13] = bufs[16+8] + bufs[16+4];
out0[0x10*12] = bufs[4];
out0[0x10*11] = bufs[16+4] + bufs[16+12];
out0[0x10*10] = bufs[12];
out0[0x10* 9] = bufs[16+12] + bufs[16+2];
out0[0x10* 8] = bufs[2];
out0[0x10* 7] = bufs[16+2] + bufs[16+10];
out0[0x10* 6] = bufs[10];
out0[0x10* 5] = bufs[16+10] + bufs[16+6];
out0[0x10* 4] = bufs[6];
out0[0x10* 3] = bufs[16+6] + bufs[16+14];
out0[0x10* 2] = bufs[14];
out0[0x10* 1] = bufs[16+14] + bufs[16+1];
out0[0x10* 0] = bufs[1];
out1[0x10* 0] = bufs[1];
out1[0x10* 1] = bufs[16+1] + bufs[16+9];
out1[0x10* 2] = bufs[9];
out1[0x10* 3] = bufs[16+9] + bufs[16+5];
out1[0x10* 4] = bufs[5];
out1[0x10* 5] = bufs[16+5] + bufs[16+13];
out1[0x10* 6] = bufs[13];
out1[0x10* 7] = bufs[16+13] + bufs[16+3];
out1[0x10* 8] = bufs[3];
out1[0x10* 9] = bufs[16+3] + bufs[16+11];
out1[0x10*10] = bufs[11];
out1[0x10*11] = bufs[16+11] + bufs[16+7];
out1[0x10*12] = bufs[7];
out1[0x10*13] = bufs[16+7] + bufs[16+15];
out1[0x10*14] = bufs[15];
out1[0x10*15] = bufs[16+15];
}