3gpplte_sse.c 10.5 KB
Newer Older
1
/*******************************************************************************
ghaddab's avatar
ghaddab committed
2 3
    OpenAirInterface 
    Copyright(c) 1999 - 2014 Eurecom
4

ghaddab's avatar
ghaddab committed
5 6 7 8
    OpenAirInterface is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
9 10


ghaddab's avatar
ghaddab committed
11 12 13 14
    OpenAirInterface 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 General Public License for more details.
15

ghaddab's avatar
ghaddab committed
16 17 18 19
    You should have received a copy of the GNU General Public License
    along with OpenAirInterface.The full GNU General Public License is 
   included in this distribution in the file called "COPYING". If not, 
   see <http://www.gnu.org/licenses/>.
20 21

  Contact Information
ghaddab's avatar
ghaddab committed
22 23 24 25
  OpenAirInterface Admin: openair_admin@eurecom.fr
  OpenAirInterface Tech : openair_tech@eurecom.fr
  OpenAirInterface Dev  : openair4g-devel@eurecom.fr
  
ghaddab's avatar
ghaddab committed
26
  Address      : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
27

ghaddab's avatar
ghaddab committed
28
 *******************************************************************************/
29 30 31 32 33 34 35 36 37 38
/* file: 3gpplte_sse.c
   purpose: Encoding routines for implementing Turbo-coded (DLSCH) transport channels from 36-212, V8.6 2009-03
   author: Laurent Thomas
   maintainer: raymond.knopp@eurecom.fr
   date: 09.2012
*/
#include "defs.h"
#include "extern_3GPPinterleaver.h"
#include <stdlib.h>

39
#include "PHY/sse_intrin.h"
40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77

//#define DEBUG_TURBO_ENCODER 1
#define CALLGRIND 1
unsigned short threegpplte_interleaver_output;
unsigned long long threegpplte_interleaver_tmp;

struct treillis {
  union {
    __m64 systematic_64[3];
    char systematic_8[24];
  };
  union {
    __m64 parity1_64[3];
    char parity1_8[24];
  };
  union {
    __m64 parity2_64[3];
    char parity2_8[24];
  };
  int exit_state;
}  __attribute__ ((aligned(64)));

struct treillis all_treillis[8][256];
int all_treillis_initialized=0;

inline unsigned char threegpplte_rsc(unsigned char input,unsigned char *state) {
  unsigned char output;
  output = (input ^ (*state>>2) ^ (*state>>1))&1;
  *state = (((input<<2)^(*state>>1))^((*state>>1)<<2)^((*state)<<2))&7;
  return(output);
}

inline void threegpplte_rsc_termination(unsigned char *x,unsigned char *z,unsigned char *state) {
  *z     = ((*state>>2) ^ (*state))   &1;
  *x     = ((*state)    ^ (*state>>1))   &1;
  *state = (*state)>>1;
}

78
void treillis_table_init(void) {
79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168
  //struct treillis t[][]=all_treillis;
  //t=memalign(16,sizeof(struct treillis)*8*256);
  int i, j,b;
  unsigned char v, current_state;

  bzero(all_treillis,sizeof(all_treillis));
  for (i=0; i<8; i++) { //all possible initial states
    for (j=0; j<=255; j++) { // all possible values of a byte
      current_state=i;
      for (b=0; b<8 ; b++ ) { // pre-compute the image of the byte j in _m128i vector right place
	all_treillis[i][j].systematic_8[b*3]= (j&(1<<(7-b)))>>(7-b);
	v=threegpplte_rsc( all_treillis[i][j].systematic_8[b*3] , 
			   &current_state);
	all_treillis[i][j].parity1_8[b*3+1]=v; // for the yparity1
	all_treillis[i][j].parity2_8[b*3+2]=v; // for the yparity2
      }
      all_treillis[i][j].exit_state=current_state;
    }
  }
  all_treillis_initialized=1;
  return ;
}


char interleave_compact_byte(short * base_interleaver,unsigned char * input, unsigned char * output, int n) {
 
  char expandInput[768*8] __attribute__((aligned(16)));
  int i,loop=n>>4;
  __m128i *i_128=(__m128i *)input, *o_128=(__m128i*)expandInput;
  __m128i tmp1, tmp2, tmp3, tmp4; 
  __m128i BIT_MASK = _mm_set_epi8(  0b00000001,
				    0b00000010,
				    0b00000100,
				    0b00001000,
				    0b00010000,
				    0b00100000,
				    0b01000000,
				    0b10000000,
				    0b00000001,
				    0b00000010,
				    0b00000100,
				    0b00001000,
				    0b00010000,
				    0b00100000,
				    0b01000000,
				    0b10000000);

  if ((n&15) > 0)
    loop++;

  for (i=0; i<loop ; i++ ) {
    /* int cur_byte=i<<3; */
    /* for (b=0;b<8;b++) */
    /*   expandInput[cur_byte+b] = (input[i]&(1<<(7-b)))>>(7-b); */
    tmp1=_mm_load_si128(i_128++);
    tmp2=_mm_unpacklo_epi8(tmp1,tmp1);
    tmp3=_mm_unpacklo_epi16(tmp2,tmp2);
    tmp4=_mm_unpacklo_epi32(tmp3,tmp3);
    *o_128++=_mm_cmpeq_epi8(_mm_and_si128(tmp4,BIT_MASK),BIT_MASK);
    
    tmp4=_mm_unpackhi_epi32(tmp3,tmp3);
    *o_128++=_mm_cmpeq_epi8(_mm_and_si128(tmp4,BIT_MASK),BIT_MASK);; 
    
    tmp3=_mm_unpackhi_epi16(tmp2,tmp2);
    tmp4=_mm_unpacklo_epi32(tmp3,tmp3);
    *o_128++=_mm_cmpeq_epi8(_mm_and_si128(tmp4,BIT_MASK),BIT_MASK);; 
    
    tmp4=_mm_unpackhi_epi32(tmp3,tmp3);
    *o_128++=_mm_cmpeq_epi8(_mm_and_si128(tmp4,BIT_MASK),BIT_MASK);; 
    
    tmp2=_mm_unpackhi_epi8(tmp1,tmp1);
    tmp3=_mm_unpacklo_epi16(tmp2,tmp2);
    tmp4=_mm_unpacklo_epi32(tmp3,tmp3);
    *o_128++=_mm_cmpeq_epi8(_mm_and_si128(tmp4,BIT_MASK),BIT_MASK);;
    
    tmp4=_mm_unpackhi_epi32(tmp3,tmp3);
    *o_128++=_mm_cmpeq_epi8(_mm_and_si128(tmp4,BIT_MASK),BIT_MASK);; 
    
    tmp3=_mm_unpackhi_epi16(tmp2,tmp2);
    tmp4=_mm_unpacklo_epi32(tmp3,tmp3);
    *o_128++=_mm_cmpeq_epi8(_mm_and_si128(tmp4,BIT_MASK),BIT_MASK);; 
    
    tmp4=_mm_unpackhi_epi32(tmp3,tmp3);
    *o_128++=_mm_cmpeq_epi8(_mm_and_si128(tmp4,BIT_MASK),BIT_MASK);; 
  }
  
  short * ptr_intl=base_interleaver;
  __m128i tmp;
  int input_length_words=n>>1;
  unsigned short * systematic2_ptr=(unsigned short *) output;
169
//   int j;
170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331
  for ( i=0; i<  input_length_words ; i ++ ) {

    //    for (j=0;j<16;j++) printf("%d(%d).",ptr_intl[j],expandInput[ptr_intl[j]]);
    //    printf("\n");
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],7);
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],6);
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],5);
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],4);
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],3);
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],2);
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],1);
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],0);
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],8+7);
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],8+6);
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],8+5);
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],8+4);
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],8+3);
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],8+2);
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],8+1);
    tmp=_mm_insert_epi8(tmp,expandInput[*ptr_intl++],8+0);
    *systematic2_ptr++=(unsigned short)_mm_movemask_epi8(tmp);
  }  
  return n;
}



#define _mm_expand_si128(xmmx, out, bit_mask)		\
  {							\
   __m128i loc_mm;					\
   loc_mm=(xmmx);					\
   loc_mm=_mm_and_si128(loc_mm,bit_mask);		\
   out=_mm_cmpeq_epi8(loc_mm,bit_mask);		\
  }

void threegpplte_turbo_encoder(unsigned char *input,
			       unsigned short input_length_bytes,
			       unsigned char *output,
			       unsigned char F,
			       unsigned short interleaver_f1,
			       unsigned short interleaver_f2) {
  
  int i;
  unsigned char *x;
  unsigned char state0=0,state1=0;
  unsigned short input_length_bits = input_length_bytes<<3;
  short * base_interleaver;

  if (  all_treillis_initialized == 0 )
    treillis_table_init();
  
  // look for f1 and f2 precomputed interleaver values
  for (i=0;f1f2mat[i].nb_bits!= input_length_bits && i <188; i++);
  if ( i == 188 ) {
    msg("Illegal frame length!\n");
    return;
  }
  else {
    base_interleaver=il_tb+f1f2mat[i].beg_index;
  }


  unsigned char systematic2[768];
  interleave_compact_byte(base_interleaver,input,systematic2,input_length_bytes);
 
  __m64 *ptr_output=(__m64*) output;
  unsigned char cur_s1, cur_s2;
  int code_rate;
  for ( state0=state1=i=0 ; i<input_length_bytes; i++ ) {
    cur_s1=input[i];
    cur_s2=systematic2[i];
    for ( code_rate=0; code_rate<3; code_rate++) {
        *ptr_output++ = _mm_add_pi8(all_treillis[state0][cur_s1].systematic_64[code_rate],
                        _mm_add_pi8(all_treillis[state0][cur_s1].parity1_64[code_rate],
                                    all_treillis[state1][cur_s2].parity2_64[code_rate]));
    }
    state0=all_treillis[state0][cur_s1].exit_state;
    state1=all_treillis[state1][cur_s2].exit_state;
  }
  
  x=output+(input_length_bits*3);

  // Trellis termination
  threegpplte_rsc_termination(&x[0],&x[1],&state0);
#ifdef DEBUG_TURBO_ENCODER 
  printf("term: x0 %d, x1 %d, state0 %d\n",x[0],x[1],state0);
#endif //DEBUG_TURBO_ENCODER

  threegpplte_rsc_termination(&x[2],&x[3],&state0);
#ifdef DEBUG_TURBO_ENCODER 
  printf("term: x0 %d, x1 %d, state0 %d\n",x[2],x[3],state0);
#endif //DEBUG_TURBO_ENCODER

  threegpplte_rsc_termination(&x[4],&x[5],&state0);
#ifdef DEBUG_TURBO_ENCODER 
  printf("term: x0 %d, x1 %d, state0 %d\n",x[4],x[5],state0);
#endif //DEBUG_TURBO_ENCODER

  threegpplte_rsc_termination(&x[6],&x[7],&state1);

#ifdef DEBUG_TURBO_ENCODER 
  printf("term: x0 %d, x1 %d, state1 %d\n",x[6],x[7],state1);
#endif //DEBUG_TURBO_ENCODER
  threegpplte_rsc_termination(&x[8],&x[9],&state1);
#ifdef DEBUG_TURBO_ENCODER 
  printf("term: x0 %d, x1 %d, state1 %d\n",x[8],x[9],state1);
#endif //DEBUG_TURBO_ENCODER
  threegpplte_rsc_termination(&x[10],&x[11],&state1);

#ifdef DEBUG_TURBO_ENCODER 
  printf("term: x0 %d, x1 %d, state1 %d\n",x[10],x[11],state1);
#endif //DEBUG_TURBO_ENCODER

  _mm_empty();
  _m_empty();
}



#ifdef MAIN

#define INPUT_LENGTH 5
#define F1 3
#define F2 10

int main(int argc,char **argv) {

  unsigned char input[INPUT_LENGTH],state,state2;
  unsigned char output[12+(3*(INPUT_LENGTH<<3))],x,z;
  int i;
  unsigned char out;

  for (state=0;state<8;state++) {
    for (i=0;i<2;i++) {
      state2=state;
      out = threegpplte_rsc(i,&state2);
      printf("State (%d->%d) : (%d,%d)\n",state,state2,i,out);      
    }
  }
  printf("\n");

  for (state=0;state<8;state++) {
    
    state2=state;
    threegpplte_rsc_termination(&x,&z,&state2);
    printf("Termination: (%d->%d) : (%d,%d)\n",state,state2,x,z);   
  }

  for (i=0;i<5;i++) {
    input[i] = i*219;
    printf("Input %d : %x\n",i,input[i]);
  }

  threegpplte_turbo_encoder(&input[0],
			    5,
			    &output[0],
			    F1,
			    F2);
  return(0);
}

#endif // MAIN