/*

	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];

}