/*

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];

}