3gpplte_turbo_decoder_sse_8bit.c 57.2 KB
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/* file: 3gpplte_turbo_decoder_sse.c
   purpose: Routines for implementing max-logmap decoding of Turbo-coded (DLSCH) transport channels from 36-212, V8.6 2009-03
   authors: raymond.knopp@eurecom.fr, Laurent Thomas (Alcatel-Lucent)
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   date: 21.10.2009
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   Note: This routine currently requires SSE2,SSSE3 and SSE4.1 equipped computers.  It uses 16-bit inputs for LLRs and 8-bit arithmetic for internal computations!
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   Changelog: 17.11.2009 FK SSE4.1 not required anymore
   Aug. 2012 new parallelization options for higher speed (8-way parallelization)
   Jan. 2013 8-bit LLR support with 16-way parallelization
   Feb. 2013 New interleaving and hard-decision optimizations (L. Thomas)
   May 2013 Extracted 8-bit code
*/

///
///

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#include "PHY/sse_intrin.h"
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#ifndef TEST_DEBUG
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#include "PHY/defs.h"
#include "PHY/CODING/defs.h"
#include "PHY/CODING/lte_interleaver_inline.h"
#include "extern_3GPPinterleaver.h"
#else

#include "defs.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#endif

#ifdef MEX
#include "mex.h"
#endif

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#define SHUFFLE16(a,b,c,d,e,f,g,h) _mm_set_epi8(h==-1?-1:h*2+1, \
            h==-1?-1:h*2, \
            g==-1?-1:g*2+1, \
            g==-1?-1:g*2, \
            f==-1?-1:f*2+1, \
            f==-1?-1:f*2, \
            e==-1?-1:e*2+1, \
            e==-1?-1:e*2, \
            d==-1?-1:d*2+1, \
            d==-1?-1:d*2, \
            c==-1?-1:c*2+1, \
            c==-1?-1:c*2, \
            b==-1?-1:b*2+1, \
            b==-1?-1:b*2, \
            a==-1?-1:a*2+1, \
            a==-1?-1:a*2);
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//#define DEBUG_LOGMAP

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typedef int8_t llr_t; // internal decoder LLR data is 8-bit fixed
typedef int8_t channel_t;
#define MAX8 127


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void log_map8(llr_t* systematic,channel_t* y_parity, llr_t* m11, llr_t* m10, llr_t *alpha, llr_t *beta, llr_t* ext,unsigned short frame_length,unsigned char term_flag,unsigned char F,int offset8_flag,
              time_stats_t *alpha_stats,time_stats_t *beta_stats,time_stats_t *gamma_stats,time_stats_t *ext_stats);
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void compute_gamma8(llr_t* m11,llr_t* m10,llr_t* systematic, channel_t* y_parity, unsigned short frame_length,unsigned char term_flag);
void compute_alpha8(llr_t*alpha,llr_t *beta, llr_t* m11,llr_t* m10, unsigned short frame_length,unsigned char F);
void compute_beta8(llr_t*alpha, llr_t* beta,llr_t* m11,llr_t* m10, unsigned short frame_length,unsigned char F,int offset8_flag);
void compute_ext8(llr_t* alpha,llr_t* beta,llr_t* m11,llr_t* m10,llr_t* extrinsic, llr_t* ap, unsigned short frame_length);


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void print_bytes(char *s, int8_t *x)
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{
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  printf("%s  : %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d\n",s,
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         x[0],x[1],x[2],x[3],x[4],x[5],x[6],x[7],
         x[8],x[9],x[10],x[11],x[12],x[13],x[14],x[15]);
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}


void log_map8(llr_t* systematic,
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              channel_t* y_parity,
              llr_t* m11,
              llr_t* m10,
              llr_t *alpha,
              llr_t *beta,
              llr_t* ext,
              unsigned short frame_length,
              unsigned char term_flag,
              unsigned char F,
              int offset8_flag,
              time_stats_t *alpha_stats,
              time_stats_t *beta_stats,
              time_stats_t *gamma_stats,
              time_stats_t *ext_stats)
{
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#ifdef DEBUG_LOGMAP
  msg("log_map, frame_length %d\n",frame_length);
#endif

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  if (gamma_stats) start_meas(gamma_stats) ;
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  compute_gamma8(m11,m10,systematic,y_parity,frame_length,term_flag) ;
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  if (gamma_stats) stop_meas(gamma_stats);
  if (alpha_stats) start_meas(alpha_stats) ;
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  compute_alpha8(alpha,beta,m11,m10,frame_length,F)                  ;
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  if (alpha_stats) stop_meas(alpha_stats);
  if (beta_stats) start_meas(beta_stats)  ;
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  compute_beta8(alpha,beta,m11,m10,frame_length,F,offset8_flag)      ;
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  if (beta_stats) stop_meas(beta_stats);
  if (ext_stats) start_meas(ext_stats)   ;
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  compute_ext8(alpha,beta,m11,m10,ext,systematic,frame_length)       ;
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  if (ext_stats) stop_meas(ext_stats);
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}

void compute_gamma8(llr_t* m11,llr_t* m10,llr_t* systematic,channel_t* y_parity,
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                    unsigned short frame_length,unsigned char term_flag)
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{
  int k,K1;
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#if defined(__x86_64__)||defined(__i386__)
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  __m128i *systematic128 = (__m128i *)systematic;
  __m128i *y_parity128   = (__m128i *)y_parity;
  __m128i *m10_128        = (__m128i *)m10;
  __m128i *m11_128        = (__m128i *)m11;
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#elif defined(__arm__)
  int8x16_t *systematic128  = (int8x16_t *)systematic;
  int8x16_t *y_parity128    = (int8x16_t *)y_parity;
  int8x16_t *m10_128        = (int8x16_t *)m10;
  int8x16_t *m11_128        = (int8x16_t *)m11;
#endif
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#ifdef DEBUG_LOGMAP
  msg("compute_gamma, %p,%p,%p,%p,framelength %d\n",m11,m10,systematic,y_parity,frame_length);
#endif

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#if defined(__x86_64__) || defined(__i386__)
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  register __m128i sl,sh,ypl,yph; //K128=_mm_set1_epi8(-128);
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#endif
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  K1 = (frame_length>>4);

  for (k=0; k<K1; k++) {
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#if defined(__x86_64__) || defined(__i386__)
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    sl  = _mm_cvtepi8_epi16(systematic128[k]);
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    sh  = _mm_cvtepi8_epi16(_mm_srli_si128(systematic128[k],8));
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    ypl = _mm_cvtepi8_epi16(y_parity128[k]);
    yph = _mm_cvtepi8_epi16(_mm_srli_si128(y_parity128[k],8));
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    m11_128[k] = _mm_packs_epi16(_mm_srai_epi16(_mm_adds_epi16(sl,ypl),1),
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                                 _mm_srai_epi16(_mm_adds_epi16(sh,yph),1));
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    m10_128[k] = _mm_packs_epi16(_mm_srai_epi16(_mm_subs_epi16(sl,ypl),1),
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                                 _mm_srai_epi16(_mm_subs_epi16(sh,yph),1));
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#elif defined(__arm__)
    m11_128[k] = vhaddq_s8(systematic128[k],y_parity128[k]);
    m10_128[k] = vhsubq_s8(systematic128[k],y_parity128[k]);
#endif
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  }
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  // Termination

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#if defined(__x86_64__) || defined(__i386__)
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  sl  = _mm_cvtepi8_epi16(systematic128[k+term_flag]);
  sh = _mm_cvtepi8_epi16(_mm_srli_si128(systematic128[k],8));
  ypl = _mm_cvtepi8_epi16(y_parity128[k+term_flag]);
  yph = _mm_cvtepi8_epi16(_mm_srli_si128(y_parity128[k],8));
  m11_128[k] = _mm_packs_epi16(_mm_srai_epi16(_mm_adds_epi16(sl,ypl),1),
                               _mm_srai_epi16(_mm_adds_epi16(sh,yph),1));
  m10_128[k] = _mm_packs_epi16(_mm_srai_epi16(_mm_subs_epi16(sl,ypl),1),
                               _mm_srai_epi16(_mm_subs_epi16(sh,yph),1));
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#elif defined(__arm__)
  m11_128[k] = vhaddq_s8(systematic128[k+term_flag],y_parity128[k]);
  m10_128[k] = vhsubq_s8(systematic128[k+term_flag],y_parity128[k]);
#endif
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}

#define L 16

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void compute_alpha8(llr_t* alpha,llr_t* beta,llr_t* m_11,llr_t* m_10,unsigned short frame_length,unsigned char F)
{
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  int k,loopval,rerun_flag;
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#if defined(__x86_64__) || defined(__i386__)
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  __m128i *alpha128=(__m128i *)alpha,*alpha_ptr;
  __m128i *m11p,*m10p;
  __m128i m_b0,m_b1,m_b2,m_b3,m_b4,m_b5,m_b6,m_b7;
  __m128i new0,new1,new2,new3,new4,new5,new6,new7;
  __m128i alpha_max;
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#elif defined(__arm__)
  int8x16_t *alpha128=(int8x16_t *)alpha,*alpha_ptr;
  int8x16_t *m11p,*m10p;
  int8x16_t m_b0,m_b1,m_b2,m_b3,m_b4,m_b5,m_b6,m_b7;
  int8x16_t new0,new1,new2,new3,new4,new5,new6,new7;
  int8x16_t alpha_max;
#endif
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  // Set initial state: first colum is known
  // the other columns are unknown, so all states are set to same value
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#if defined(__x86_64__) || defined(__i386__)
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  alpha128[0] = _mm_set_epi8(-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,0);
  alpha128[1] = _mm_set_epi8(-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2);
  alpha128[2] = _mm_set_epi8(-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2);
  alpha128[3] = _mm_set_epi8(-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2);
  alpha128[4] = _mm_set_epi8(-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2);
  alpha128[5] = _mm_set_epi8(-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2);
  alpha128[6] = _mm_set_epi8(-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2);
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  alpha128[7] = _mm_set_epi8(-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2,-MAX8/2);
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  for (loopval=frame_length>>4, rerun_flag=0; rerun_flag<2; loopval=L, rerun_flag++) {
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    alpha_ptr = &alpha128[0];
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    m11p = (__m128i*)m_11;
    m10p = (__m128i*)m_10;
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    for (k=0;  k<loopval;  k++) {
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      m_b0 = _mm_adds_epi8(alpha_ptr[1],*m11p);  // m11
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      m_b4 = _mm_subs_epi8(alpha_ptr[1],*m11p);  // m00=-m11
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      m_b1 = _mm_subs_epi8(alpha_ptr[3],*m10p);  // m01=-m10
      m_b5 = _mm_adds_epi8(alpha_ptr[3],*m10p);  // m10
      m_b2 = _mm_adds_epi8(alpha_ptr[5],*m10p);  // m10
      m_b6 = _mm_subs_epi8(alpha_ptr[5],*m10p);  // m01=-m10
      m_b3 = _mm_subs_epi8(alpha_ptr[7],*m11p);  // m00=-m11
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      m_b7 = _mm_adds_epi8(alpha_ptr[7],*m11p);  // m11

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      new0 = _mm_subs_epi8(alpha_ptr[0],*m11p);  // m00=-m11
      new4 = _mm_adds_epi8(alpha_ptr[0],*m11p);  // m11
      new1 = _mm_adds_epi8(alpha_ptr[2],*m10p);  // m10
      new5 = _mm_subs_epi8(alpha_ptr[2],*m10p);  // m01=-m10
      new2 = _mm_subs_epi8(alpha_ptr[4],*m10p);  // m01=-m10
      new6 = _mm_adds_epi8(alpha_ptr[4],*m10p);  // m10
      new3 = _mm_adds_epi8(alpha_ptr[6],*m11p);  // m11
      new7 = _mm_subs_epi8(alpha_ptr[6],*m11p);  // m00=-m11
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      alpha_ptr += 8;
      m11p++;
      m10p++;
      alpha_ptr[0] = _mm_max_epi8(m_b0,new0);
      alpha_ptr[1] = _mm_max_epi8(m_b1,new1);
      alpha_ptr[2] = _mm_max_epi8(m_b2,new2);
      alpha_ptr[3] = _mm_max_epi8(m_b3,new3);
      alpha_ptr[4] = _mm_max_epi8(m_b4,new4);
      alpha_ptr[5] = _mm_max_epi8(m_b5,new5);
      alpha_ptr[6] = _mm_max_epi8(m_b6,new6);
      alpha_ptr[7] = _mm_max_epi8(m_b7,new7);
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      // compute and subtract maxima
      alpha_max = _mm_max_epi8(alpha_ptr[0],alpha_ptr[1]);
      alpha_max = _mm_max_epi8(alpha_max,alpha_ptr[2]);
      alpha_max = _mm_max_epi8(alpha_max,alpha_ptr[3]);
      alpha_max = _mm_max_epi8(alpha_max,alpha_ptr[4]);
      alpha_max = _mm_max_epi8(alpha_max,alpha_ptr[5]);
      alpha_max = _mm_max_epi8(alpha_max,alpha_ptr[6]);
      alpha_max = _mm_max_epi8(alpha_max,alpha_ptr[7]);

      alpha_ptr[0] = _mm_subs_epi8(alpha_ptr[0],alpha_max);
      alpha_ptr[1] = _mm_subs_epi8(alpha_ptr[1],alpha_max);
      alpha_ptr[2] = _mm_subs_epi8(alpha_ptr[2],alpha_max);
      alpha_ptr[3] = _mm_subs_epi8(alpha_ptr[3],alpha_max);
      alpha_ptr[4] = _mm_subs_epi8(alpha_ptr[4],alpha_max);
      alpha_ptr[5] = _mm_subs_epi8(alpha_ptr[5],alpha_max);
      alpha_ptr[6] = _mm_subs_epi8(alpha_ptr[6],alpha_max);
      alpha_ptr[7] = _mm_subs_epi8(alpha_ptr[7],alpha_max);
    }

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    // Set intial state for next iteration from the last state
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    // as acolum end states are the first states of the next column
    int K1= frame_length>>1;
    alpha128[0] = _mm_slli_si128(alpha128[K1],1);
    alpha128[1] = _mm_slli_si128(alpha128[1+K1],1);
    alpha128[2] = _mm_slli_si128(alpha128[2+K1],1);
    alpha128[3] = _mm_slli_si128(alpha128[3+K1],1);
    alpha128[4] = _mm_slli_si128(alpha128[4+K1],1);
    alpha128[5] = _mm_slli_si128(alpha128[5+K1],1);
    alpha128[6] = _mm_slli_si128(alpha128[6+K1],1);
    alpha128[7] = _mm_slli_si128(alpha128[7+K1],1);
    alpha[16] =  -MAX8/2;
    alpha[32] = -MAX8/2;
    alpha[48] = -MAX8/2;
    alpha[64] = -MAX8/2;
    alpha[80] = -MAX8/2;
    alpha[96] = -MAX8/2;
    alpha[112] = -MAX8/2;

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  }
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#elif defined(__arm__)
  alpha128[0] = vdupq_n_s8(-MAX8/2);
  alpha128[0] = vsetq_lane_s8(0,alpha128[0],0);
  alpha128[1] = vdupq_n_s8(-MAX8/2);
  alpha128[2] = vdupq_n_s8(-MAX8/2);
  alpha128[3] = vdupq_n_s8(-MAX8/2);
  alpha128[4] = vdupq_n_s8(-MAX8/2);
  alpha128[5] = vdupq_n_s8(-MAX8/2);
  alpha128[6] = vdupq_n_s8(-MAX8/2);
  alpha128[7] = vdupq_n_s8(-MAX8/2);
  for (loopval=frame_length>>4, rerun_flag=0; rerun_flag<2; loopval=L, rerun_flag++) {

    alpha_ptr = &alpha128[0];

    m11p = (int8x16_t*)m_11;
    m10p = (int8x16_t*)m_10;

    for (k=0;  k<loopval;  k++) {
      m_b0 = vqaddq_s8(alpha_ptr[1],*m11p);  // m11
      m_b4 = vqsubq_s8(alpha_ptr[1],*m11p);  // m00=-m11
      m_b1 = vqsubq_s8(alpha_ptr[3],*m10p);  // m01=-m10
      m_b5 = vqaddq_s8(alpha_ptr[3],*m10p);  // m10
      m_b2 = vqaddq_s8(alpha_ptr[5],*m10p);  // m10
      m_b6 = vqsubq_s8(alpha_ptr[5],*m10p);  // m01=-m10
      m_b3 = vqsubq_s8(alpha_ptr[7],*m11p);  // m00=-m11
      m_b7 = vqaddq_s8(alpha_ptr[7],*m11p);  // m11

      new0 = vqsubq_s8(alpha_ptr[0],*m11p);  // m00=-m11
      new4 = vqaddq_s8(alpha_ptr[0],*m11p);  // m11
      new1 = vqaddq_s8(alpha_ptr[2],*m10p);  // m10
      new5 = vqsubq_s8(alpha_ptr[2],*m10p);  // m01=-m10
      new2 = vqsubq_s8(alpha_ptr[4],*m10p);  // m01=-m10
      new6 = vqaddq_s8(alpha_ptr[4],*m10p);  // m10
      new3 = vqaddq_s8(alpha_ptr[6],*m11p);  // m11
      new7 = vqsubq_s8(alpha_ptr[6],*m11p);  // m00=-m11

      alpha_ptr += 8;
      m11p++;
      m10p++;
      alpha_ptr[0] = vmaxq_s8(m_b0,new0);
      alpha_ptr[1] = vmaxq_s8(m_b1,new1);
      alpha_ptr[2] = vmaxq_s8(m_b2,new2);
      alpha_ptr[3] = vmaxq_s8(m_b3,new3);
      alpha_ptr[4] = vmaxq_s8(m_b4,new4);
      alpha_ptr[5] = vmaxq_s8(m_b5,new5);
      alpha_ptr[6] = vmaxq_s8(m_b6,new6);
      alpha_ptr[7] = vmaxq_s8(m_b7,new7);

      // compute and subtract maxima
      alpha_max = vmaxq_s8(alpha_ptr[0],alpha_ptr[1]);
      alpha_max = vmaxq_s8(alpha_max,alpha_ptr[2]);
      alpha_max = vmaxq_s8(alpha_max,alpha_ptr[3]);
      alpha_max = vmaxq_s8(alpha_max,alpha_ptr[4]);
      alpha_max = vmaxq_s8(alpha_max,alpha_ptr[5]);
      alpha_max = vmaxq_s8(alpha_max,alpha_ptr[6]);
      alpha_max = vmaxq_s8(alpha_max,alpha_ptr[7]);

      alpha_ptr[0] = vqsubq_s8(alpha_ptr[0],alpha_max);
      alpha_ptr[1] = vqsubq_s8(alpha_ptr[1],alpha_max);
      alpha_ptr[2] = vqsubq_s8(alpha_ptr[2],alpha_max);
      alpha_ptr[3] = vqsubq_s8(alpha_ptr[3],alpha_max);
      alpha_ptr[4] = vqsubq_s8(alpha_ptr[4],alpha_max);
      alpha_ptr[5] = vqsubq_s8(alpha_ptr[5],alpha_max);
      alpha_ptr[6] = vqsubq_s8(alpha_ptr[6],alpha_max);
      alpha_ptr[7] = vqsubq_s8(alpha_ptr[7],alpha_max);
    }

    // Set intial state for next iteration from the last state
    // as a column end states are the first states of the next column
    int K1= frame_length>>1;
    alpha128[0] = (int8x16_t)vshlq_n_s64((int64x2_t)alpha128[K1],8);   alpha128[0] = vsetq_lane_s8(alpha[8],alpha128[0],7);
    alpha128[1] = (int8x16_t)vshlq_n_s64((int64x2_t)alpha128[1+K1],8); alpha128[1] = vsetq_lane_s8(alpha[24],alpha128[0],7);
    alpha128[2] = (int8x16_t)vshlq_n_s64((int64x2_t)alpha128[2+K1],8); alpha128[2] = vsetq_lane_s8(alpha[40],alpha128[0],7);
    alpha128[3] = (int8x16_t)vshlq_n_s64((int64x2_t)alpha128[3+K1],8); alpha128[3] = vsetq_lane_s8(alpha[56],alpha128[0],7);
    alpha128[4] = (int8x16_t)vshlq_n_s64((int64x2_t)alpha128[4+K1],8); alpha128[4] = vsetq_lane_s8(alpha[72],alpha128[0],7);
    alpha128[5] = (int8x16_t)vshlq_n_s64((int64x2_t)alpha128[5+K1],8); alpha128[5] = vsetq_lane_s8(alpha[88],alpha128[0],7);
    alpha128[6] = (int8x16_t)vshlq_n_s64((int64x2_t)alpha128[6+K1],8); alpha128[6] = vsetq_lane_s8(alpha[104],alpha128[0],7);
    alpha128[7] = (int8x16_t)vshlq_n_s64((int64x2_t)alpha128[7+K1],8); alpha128[7] = vsetq_lane_s8(alpha[120],alpha128[0],7);
    alpha[16] =  -MAX8/2;
    alpha[32] = -MAX8/2;
    alpha[48] = -MAX8/2;
    alpha[64] = -MAX8/2;
    alpha[80] = -MAX8/2;
    alpha[96] = -MAX8/2;
    alpha[112] = -MAX8/2;

  }
#endif

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}


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void compute_beta8(llr_t* alpha,llr_t* beta,llr_t *m_11,llr_t* m_10,unsigned short frame_length,unsigned char F,int offset8_flag)
{

387
  int k,rerun_flag, loopval;
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#if defined(__x86_64__) || defined(__i386__)
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  __m128i m11_128,m10_128;
  __m128i m_b0,m_b1,m_b2,m_b3,m_b4,m_b5,m_b6,m_b7;
  __m128i new0,new1,new2,new3,new4,new5,new6,new7;

  __m128i *beta128,*alpha128,*beta_ptr;
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  __m128i beta_max;
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#elif defined(__arm__)
  int8x16_t m11_128,m10_128;
  int8x16_t m_b0,m_b1,m_b2,m_b3,m_b4,m_b5,m_b6,m_b7;
  int8x16_t new0,new1,new2,new3,new4,new5,new6,new7;
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  int8x16_t *beta128,*alpha128,*beta_ptr;
  int8x16_t beta_max;
#endif
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  llr_t beta0,beta1;

  llr_t beta2,beta3,beta4,beta5,beta6,beta7;
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#if 0
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  int16_t m11,m10;
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  int16_t beta0_16,beta1_16,beta2_16,beta3_16,beta4_16,beta5_16,beta6_16,beta7_16,beta0_2,beta1_2,beta2_2,beta3_2,beta_m;
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  __m128i beta_16;
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  // termination for beta initialization

  m11=(int16_t)m_11[2+frame_length];
  m10=(int16_t)m_10[2+frame_length];

  beta0 = -m11;//M0T_TERM;
  beta1 = m11;//M1T_TERM;
  m11=(int16_t)m_11[1+frame_length];
  m10=(int16_t)m_10[1+frame_length];

  beta0_2 = beta0-m11;//+M0T_TERM;
  beta1_2 = beta0+m11;//+M1T_TERM;
  beta2_2 = beta1+m10;//M2T_TERM;
  beta3_2 = beta1-m10;//+M3T_TERM;
  m11=(int16_t)m_11[frame_length];
  m10=(int16_t)m_10[frame_length];

  beta0_16 = beta0_2-m11;//+M0T_TERM;
  beta1_16 = beta0_2+m11;//+M1T_TERM;
  beta2_16 = beta1_2+m10;//+M2T_TERM;
  beta3_16 = beta1_2-m10;//+M3T_TERM;
  beta4_16 = beta2_2-m10;//+M4T_TERM;
  beta5_16 = beta2_2+m10;//+M5T_TERM;
  beta6_16 = beta3_2+m11;//+M6T_TERM;
  beta7_16 = beta3_2-m11;//+M7T_TERM;

  beta_m = (beta0_16>beta1_16) ? beta0_16 : beta1_16;
  beta_m = (beta_m>beta2_16) ? beta_m : beta2_16;
  beta_m = (beta_m>beta3_16) ? beta_m : beta3_16;
  beta_m = (beta_m>beta4_16) ? beta_m : beta4_16;
  beta_m = (beta_m>beta5_16) ? beta_m : beta5_16;
  beta_m = (beta_m>beta6_16) ? beta_m : beta6_16;
  beta_m = (beta_m>beta7_16) ? beta_m : beta7_16;

  beta0_16=beta0_16-beta_m;
  beta1_16=beta1_16-beta_m;
  beta2_16=beta2_16-beta_m;
  beta3_16=beta3_16-beta_m;
  beta4_16=beta4_16-beta_m;
  beta5_16=beta5_16-beta_m;
  beta6_16=beta6_16-beta_m;
  beta7_16=beta7_16-beta_m;

  beta_16 = _mm_set_epi16(beta7_16,beta6_16,beta5_16,beta4_16,beta3_16,beta2_16,beta1_16,beta0_16);
  beta_16 = _mm_packs_epi16(beta_16,beta_16);
  beta0 = _mm_extract_epi8(beta_16,0);
  beta1 = _mm_extract_epi8(beta_16,1);
  beta2 = _mm_extract_epi8(beta_16,2);
  beta3 = _mm_extract_epi8(beta_16,3);
  beta4 = _mm_extract_epi8(beta_16,4);
  beta5 = _mm_extract_epi8(beta_16,5);
  beta6 = _mm_extract_epi8(beta_16,6);
  beta7 = _mm_extract_epi8(beta_16,7);

#endif

  // we are supposed to run compute_alpha just before compute_beta
  // so the initial states of backward computation can be set from last value of alpha states (forward computation)
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#if defined(__x86_64__) || defined(__i386__)
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  beta_ptr   = (__m128i*)&beta[frame_length<<3];
  alpha128   = (__m128i*)&alpha[0];
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#elif defined(__arm__)
  beta_ptr   = (int8x16_t*)&beta[frame_length<<3];
  alpha128   = (int8x16_t*)&alpha[0];
#endif
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  beta_ptr[0] = alpha128[(frame_length>>1)];
  beta_ptr[1] = alpha128[1+(frame_length>>1)];
  beta_ptr[2] = alpha128[2+(frame_length>>1)];
  beta_ptr[3] = alpha128[3+(frame_length>>1)];
  beta_ptr[4] = alpha128[4+(frame_length>>1)];
  beta_ptr[5] = alpha128[5+(frame_length>>1)];
  beta_ptr[6] = alpha128[6+(frame_length>>1)];
  beta_ptr[7] = alpha128[7+(frame_length>>1)];

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  for (rerun_flag=0, loopval=0;
       rerun_flag<2 ;
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       loopval=(frame_length>>4)-L,rerun_flag++) {

    if (offset8_flag==0) {
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      // FIXME! beta0-beta7 are used uninitialized. FIXME!
      // workaround: init with 0
      beta0 = beta1 = beta2 = beta3 = beta4 = beta5 = beta6 = beta7 = 0;

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#if defined(__x86_64__) || defined(__i386__)
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      beta_ptr[0] = _mm_insert_epi8(beta_ptr[0],beta0,15);
      beta_ptr[1] = _mm_insert_epi8(beta_ptr[1],beta1,15);
      beta_ptr[2] = _mm_insert_epi8(beta_ptr[2],beta2,15);
      beta_ptr[3] = _mm_insert_epi8(beta_ptr[3],beta3,15);
      beta_ptr[4] = _mm_insert_epi8(beta_ptr[4],beta4,15);
      beta_ptr[5] = _mm_insert_epi8(beta_ptr[5],beta5,15);
      beta_ptr[6] = _mm_insert_epi8(beta_ptr[6],beta6,15);
      beta_ptr[7] = _mm_insert_epi8(beta_ptr[7],beta7,15);
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#elif defined(__arm__)
      beta_ptr[0] = vsetq_lane_s8(beta0,beta_ptr[0],15);
      beta_ptr[1] = vsetq_lane_s8(beta1,beta_ptr[1],15);
      beta_ptr[2] = vsetq_lane_s8(beta2,beta_ptr[2],15);
      beta_ptr[3] = vsetq_lane_s8(beta3,beta_ptr[3],15);
      beta_ptr[4] = vsetq_lane_s8(beta4,beta_ptr[4],15);
      beta_ptr[5] = vsetq_lane_s8(beta5,beta_ptr[5],15);
      beta_ptr[6] = vsetq_lane_s8(beta6,beta_ptr[6],15);
      beta_ptr[7] = vsetq_lane_s8(beta7,beta_ptr[7],15);
#endif
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    }

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#if defined(__x86_64__) || defined(__i386__)
    beta_ptr = (__m128i*)&beta[frame_length<<3];
#elif defined(__arm__)
    beta_ptr = (int8x16_t*)&beta[frame_length<<3];
#endif
    for (k=(frame_length>>4)-1;
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         k>=loopval;
         k--) {
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#if defined(__x86_64__) || defined(__i386__)
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      m11_128=((__m128i*)m_11)[k];
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      m10_128=((__m128i*)m_10)[k];
      m_b0 = _mm_adds_epi8(beta_ptr[4],m11_128);  //m11
      m_b1 = _mm_subs_epi8(beta_ptr[4],m11_128);  //m00
      m_b2 = _mm_subs_epi8(beta_ptr[5],m10_128);  //m01
      m_b3 = _mm_adds_epi8(beta_ptr[5],m10_128);  //m10
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      m_b4 = _mm_adds_epi8(beta_ptr[6],m10_128);  //m10
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      m_b5 = _mm_subs_epi8(beta_ptr[6],m10_128);  //m01
      m_b6 = _mm_subs_epi8(beta_ptr[7],m11_128);  //m00
      m_b7 = _mm_adds_epi8(beta_ptr[7],m11_128);  //m11
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      new0 = _mm_subs_epi8(beta_ptr[0],m11_128);  //m00
      new1 = _mm_adds_epi8(beta_ptr[0],m11_128);  //m11
      new2 = _mm_adds_epi8(beta_ptr[1],m10_128);  //m10
      new3 = _mm_subs_epi8(beta_ptr[1],m10_128);  //m01
      new4 = _mm_subs_epi8(beta_ptr[2],m10_128);  //m01
      new5 = _mm_adds_epi8(beta_ptr[2],m10_128);  //m10
      new6 = _mm_adds_epi8(beta_ptr[3],m11_128);  //m11
      new7 = _mm_subs_epi8(beta_ptr[3],m11_128);  //m00
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      beta_ptr-=8;
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      beta_ptr[0] = _mm_max_epi8(m_b0,new0);
      beta_ptr[1] = _mm_max_epi8(m_b1,new1);
      beta_ptr[2] = _mm_max_epi8(m_b2,new2);
      beta_ptr[3] = _mm_max_epi8(m_b3,new3);
      beta_ptr[4] = _mm_max_epi8(m_b4,new4);
      beta_ptr[5] = _mm_max_epi8(m_b5,new5);
      beta_ptr[6] = _mm_max_epi8(m_b6,new6);
      beta_ptr[7] = _mm_max_epi8(m_b7,new7);
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      beta_max = _mm_max_epi8(beta_ptr[0],beta_ptr[1]);
      beta_max = _mm_max_epi8(beta_max   ,beta_ptr[2]);
      beta_max = _mm_max_epi8(beta_max   ,beta_ptr[3]);
      beta_max = _mm_max_epi8(beta_max   ,beta_ptr[4]);
      beta_max = _mm_max_epi8(beta_max   ,beta_ptr[5]);
      beta_max = _mm_max_epi8(beta_max   ,beta_ptr[6]);
      beta_max = _mm_max_epi8(beta_max   ,beta_ptr[7]);

      beta_ptr[0] = _mm_subs_epi8(beta_ptr[0],beta_max);
      beta_ptr[1] = _mm_subs_epi8(beta_ptr[1],beta_max);
      beta_ptr[2] = _mm_subs_epi8(beta_ptr[2],beta_max);
      beta_ptr[3] = _mm_subs_epi8(beta_ptr[3],beta_max);
      beta_ptr[4] = _mm_subs_epi8(beta_ptr[4],beta_max);
      beta_ptr[5] = _mm_subs_epi8(beta_ptr[5],beta_max);
      beta_ptr[6] = _mm_subs_epi8(beta_ptr[6],beta_max);
      beta_ptr[7] = _mm_subs_epi8(beta_ptr[7],beta_max);
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#elif defined(__arm__)
      m11_128=((int8x16_t*)m_11)[k];
      m10_128=((int8x16_t*)m_10)[k];
      m_b0 = vqaddq_s8(beta_ptr[4],m11_128);  //m11
      m_b1 = vqsubq_s8(beta_ptr[4],m11_128);  //m00
      m_b2 = vqsubq_s8(beta_ptr[5],m10_128);  //m01
      m_b3 = vqaddq_s8(beta_ptr[5],m10_128);  //m10
      m_b4 = vqaddq_s8(beta_ptr[6],m10_128);  //m10
      m_b5 = vqsubq_s8(beta_ptr[6],m10_128);  //m01
      m_b6 = vqsubq_s8(beta_ptr[7],m11_128);  //m00
      m_b7 = vqaddq_s8(beta_ptr[7],m11_128);  //m11

      new0 = vqsubq_s8(beta_ptr[0],m11_128);  //m00
      new1 = vqaddq_s8(beta_ptr[0],m11_128);  //m11
      new2 = vqaddq_s8(beta_ptr[1],m10_128);  //m10
      new3 = vqsubq_s8(beta_ptr[1],m10_128);  //m01
      new4 = vqsubq_s8(beta_ptr[2],m10_128);  //m01
      new5 = vqaddq_s8(beta_ptr[2],m10_128);  //m10
      new6 = vqaddq_s8(beta_ptr[3],m11_128);  //m11
      new7 = vqsubq_s8(beta_ptr[3],m11_128);  //m00

      beta_ptr-=8;
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      beta_ptr[0] = vmaxq_s8(m_b0,new0);
      beta_ptr[1] = vmaxq_s8(m_b1,new1);
      beta_ptr[2] = vmaxq_s8(m_b2,new2);
      beta_ptr[3] = vmaxq_s8(m_b3,new3);
      beta_ptr[4] = vmaxq_s8(m_b4,new4);
      beta_ptr[5] = vmaxq_s8(m_b5,new5);
      beta_ptr[6] = vmaxq_s8(m_b6,new6);
      beta_ptr[7] = vmaxq_s8(m_b7,new7);

      beta_max = vmaxq_s8(beta_ptr[0],beta_ptr[1]);
      beta_max = vmaxq_s8(beta_max   ,beta_ptr[2]);
      beta_max = vmaxq_s8(beta_max   ,beta_ptr[3]);
      beta_max = vmaxq_s8(beta_max   ,beta_ptr[4]);
      beta_max = vmaxq_s8(beta_max   ,beta_ptr[5]);
      beta_max = vmaxq_s8(beta_max   ,beta_ptr[6]);
      beta_max = vmaxq_s8(beta_max   ,beta_ptr[7]);

      beta_ptr[0] = vqsubq_s8(beta_ptr[0],beta_max);
      beta_ptr[1] = vqsubq_s8(beta_ptr[1],beta_max);
      beta_ptr[2] = vqsubq_s8(beta_ptr[2],beta_max);
      beta_ptr[3] = vqsubq_s8(beta_ptr[3],beta_max);
      beta_ptr[4] = vqsubq_s8(beta_ptr[4],beta_max);
      beta_ptr[5] = vqsubq_s8(beta_ptr[5],beta_max);
      beta_ptr[6] = vqsubq_s8(beta_ptr[6],beta_max);
      beta_ptr[7] = vqsubq_s8(beta_ptr[7],beta_max);
#endif
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    }

    // Set intial state for next iteration from the last state
625
    // as column last states are the first states of the next column
626 627 628
    // The initial state of column 0 is coming from tail bits (to be computed)

#if defined(__x86_64__) || defined(__i386__)
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    beta128 = (__m128i*)&beta[0];
    beta_ptr   = (__m128i*)&beta[frame_length<<3];
    beta_ptr[0] = _mm_srli_si128(beta128[0],1);
    beta_ptr[1] = _mm_srli_si128(beta128[1],1);
    beta_ptr[2] = _mm_srli_si128(beta128[2],1);
    beta_ptr[3] = _mm_srli_si128(beta128[3],1);
    beta_ptr[4] = _mm_srli_si128(beta128[4],1);
    beta_ptr[5] = _mm_srli_si128(beta128[5],1);
    beta_ptr[6] = _mm_srli_si128(beta128[6],1);
    beta_ptr[7] = _mm_srli_si128(beta128[7],1);
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#elif defined(__arm__)
    beta128 = (int8x16_t*)&beta[0];
    beta_ptr   = (int8x16_t*)&beta[frame_length<<3];
    beta_ptr[0] = (int8x16_t)vshrq_n_s64((int64x2_t)beta128[0],8);   beta_ptr[0] = vsetq_lane_s8(beta[7],beta_ptr[0],8);
    beta_ptr[1] = (int8x16_t)vshrq_n_s64((int64x2_t)beta128[1],8);   beta_ptr[1] = vsetq_lane_s8(beta[23],beta_ptr[1],8);
    beta_ptr[2] = (int8x16_t)vshrq_n_s64((int64x2_t)beta128[2],8);   beta_ptr[2] = vsetq_lane_s8(beta[39],beta_ptr[2],8);
    beta_ptr[3] = (int8x16_t)vshrq_n_s64((int64x2_t)beta128[3],8);   beta_ptr[3] = vsetq_lane_s8(beta[55],beta_ptr[3],8);
    beta_ptr[4] = (int8x16_t)vshrq_n_s64((int64x2_t)beta128[4],8);   beta_ptr[4] = vsetq_lane_s8(beta[71],beta_ptr[4],8);
    beta_ptr[5] = (int8x16_t)vshrq_n_s64((int64x2_t)beta128[5],8);   beta_ptr[5] = vsetq_lane_s8(beta[87],beta_ptr[5],8);
    beta_ptr[6] = (int8x16_t)vshrq_n_s64((int64x2_t)beta128[6],8);   beta_ptr[6] = vsetq_lane_s8(beta[103],beta_ptr[6],8);
    beta_ptr[7] = (int8x16_t)vshrq_n_s64((int64x2_t)beta128[7],8);   beta_ptr[7] = vsetq_lane_s8(beta[119],beta_ptr[7],8);
#endif
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  }
}

654 655
void compute_ext8(llr_t* alpha,llr_t* beta,llr_t* m_11,llr_t* m_10,llr_t* ext, llr_t* systematic,unsigned short frame_length)
{
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657
#if defined(__x86_64__) || defined(__i386__)
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  __m128i *alpha128=(__m128i *)alpha;
  __m128i *beta128=(__m128i *)beta;
  __m128i *m11_128,*m10_128,*ext_128;
  __m128i *alpha_ptr,*beta_ptr;
  __m128i m00_1,m00_2,m00_3,m00_4;
  __m128i m01_1,m01_2,m01_3,m01_4;
  __m128i m10_1,m10_2,m10_3,m10_4;
  __m128i m11_1,m11_2,m11_3,m11_4;
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#elif defined(__arm__)
  int8x16_t *alpha128=(int8x16_t *)alpha;
  int8x16_t *beta128=(int8x16_t *)beta;
  int8x16_t *m11_128,*m10_128,*ext_128;
  int8x16_t *alpha_ptr,*beta_ptr;
  int8x16_t m00_1,m00_2,m00_3,m00_4;
  int8x16_t m01_1,m01_2,m01_3,m01_4;
  int8x16_t m10_1,m10_2,m10_3,m10_4;
  int8x16_t m11_1,m11_2,m11_3,m11_4;
#endif
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  int k;

  //
  // LLR computation, 8 consequtive bits per loop
  //

#ifdef DEBUG_LOGMAP
  msg("compute_ext, %p, %p, %p, %p, %p, %p ,framelength %d\n",alpha,beta,m_11,m_10,ext,systematic,frame_length);
#endif

  alpha_ptr = alpha128;
  beta_ptr = &beta128[8];


690
  for (k=0; k<(frame_length>>4); k++) {
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#if defined(__x86_64__) || defined(__i386__)

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    m11_128        = (__m128i*)&m_11[k<<4];
    m10_128        = (__m128i*)&m_10[k<<4];
    ext_128        = (__m128i*)&ext[k<<4];

    m00_4 = _mm_adds_epi8(alpha_ptr[7],beta_ptr[3]); //ALPHA_BETA_4m00;
    m11_4 = _mm_adds_epi8(alpha_ptr[7],beta_ptr[7]); //ALPHA_BETA_4m11;
    m00_3 = _mm_adds_epi8(alpha_ptr[6],beta_ptr[7]); //ALPHA_BETA_3m00;
    m11_3 = _mm_adds_epi8(alpha_ptr[6],beta_ptr[3]); //ALPHA_BETA_3m11;
    m00_2 = _mm_adds_epi8(alpha_ptr[1],beta_ptr[4]); //ALPHA_BETA_2m00;
    m11_2 = _mm_adds_epi8(alpha_ptr[1],beta_ptr[0]); //ALPHA_BETA_2m11;
    m11_1 = _mm_adds_epi8(alpha_ptr[0],beta_ptr[4]); //ALPHA_BETA_1m11;
    m00_1 = _mm_adds_epi8(alpha_ptr[0],beta_ptr[0]); //ALPHA_BETA_1m00;
    m01_4 = _mm_adds_epi8(alpha_ptr[5],beta_ptr[6]); //ALPHA_BETA_4m01;
    m10_4 = _mm_adds_epi8(alpha_ptr[5],beta_ptr[2]); //ALPHA_BETA_4m10;
    m01_3 = _mm_adds_epi8(alpha_ptr[4],beta_ptr[2]); //ALPHA_BETA_3m01;
    m10_3 = _mm_adds_epi8(alpha_ptr[4],beta_ptr[6]); //ALPHA_BETA_3m10;
    m01_2 = _mm_adds_epi8(alpha_ptr[3],beta_ptr[1]); //ALPHA_BETA_2m01;
    m10_2 = _mm_adds_epi8(alpha_ptr[3],beta_ptr[5]); //ALPHA_BETA_2m10;
    m10_1 = _mm_adds_epi8(alpha_ptr[2],beta_ptr[1]); //ALPHA_BETA_1m10;
    m01_1 = _mm_adds_epi8(alpha_ptr[2],beta_ptr[5]); //ALPHA_BETA_1m01;

    m01_1 = _mm_max_epi8(m01_1,m01_2);
    m01_1 = _mm_max_epi8(m01_1,m01_3);
    m01_1 = _mm_max_epi8(m01_1,m01_4);
    m00_1 = _mm_max_epi8(m00_1,m00_2);
    m00_1 = _mm_max_epi8(m00_1,m00_3);
    m00_1 = _mm_max_epi8(m00_1,m00_4);
    m10_1 = _mm_max_epi8(m10_1,m10_2);
    m10_1 = _mm_max_epi8(m10_1,m10_3);
    m10_1 = _mm_max_epi8(m10_1,m10_4);
    m11_1 = _mm_max_epi8(m11_1,m11_2);
    m11_1 = _mm_max_epi8(m11_1,m11_3);
    m11_1 = _mm_max_epi8(m11_1,m11_4);

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    m01_1 = _mm_subs_epi8(m01_1,*m10_128);
    m00_1 = _mm_subs_epi8(m00_1,*m11_128);
    m10_1 = _mm_adds_epi8(m10_1,*m10_128);
    m11_1 = _mm_adds_epi8(m11_1,*m11_128);


    m01_1 = _mm_max_epi8(m01_1,m00_1);
    m10_1 = _mm_max_epi8(m10_1,m11_1);


    *ext_128 = _mm_subs_epi8(m10_1,m01_1);
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    alpha_ptr+=8;
    beta_ptr+=8;
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#elif defined(__arm__)

    m11_128        = (int8x16_t*)&m_11[k<<4];
    m10_128        = (int8x16_t*)&m_10[k<<4];
    ext_128        = (int8x16_t*)&ext[k<<4];

    m00_4 = vqaddq_s8(alpha_ptr[7],beta_ptr[3]); //ALPHA_BETA_4m00;
    m11_4 = vqaddq_s8(alpha_ptr[7],beta_ptr[7]); //ALPHA_BETA_4m11;
    m00_3 = vqaddq_s8(alpha_ptr[6],beta_ptr[7]); //ALPHA_BETA_3m00;
    m11_3 = vqaddq_s8(alpha_ptr[6],beta_ptr[3]); //ALPHA_BETA_3m11;
    m00_2 = vqaddq_s8(alpha_ptr[1],beta_ptr[4]); //ALPHA_BETA_2m00;
    m11_2 = vqaddq_s8(alpha_ptr[1],beta_ptr[0]); //ALPHA_BETA_2m11;
    m11_1 = vqaddq_s8(alpha_ptr[0],beta_ptr[4]); //ALPHA_BETA_1m11;
    m00_1 = vqaddq_s8(alpha_ptr[0],beta_ptr[0]); //ALPHA_BETA_1m00;
    m01_4 = vqaddq_s8(alpha_ptr[5],beta_ptr[6]); //ALPHA_BETA_4m01;
    m10_4 = vqaddq_s8(alpha_ptr[5],beta_ptr[2]); //ALPHA_BETA_4m10;
    m01_3 = vqaddq_s8(alpha_ptr[4],beta_ptr[2]); //ALPHA_BETA_3m01;
    m10_3 = vqaddq_s8(alpha_ptr[4],beta_ptr[6]); //ALPHA_BETA_3m10;
    m01_2 = vqaddq_s8(alpha_ptr[3],beta_ptr[1]); //ALPHA_BETA_2m01;
    m10_2 = vqaddq_s8(alpha_ptr[3],beta_ptr[5]); //ALPHA_BETA_2m10;
    m10_1 = vqaddq_s8(alpha_ptr[2],beta_ptr[1]); //ALPHA_BETA_1m10;
    m01_1 = vqaddq_s8(alpha_ptr[2],beta_ptr[5]); //ALPHA_BETA_1m01;

    m01_1 = vmaxq_s8(m01_1,m01_2);
    m01_1 = vmaxq_s8(m01_1,m01_3);
    m01_1 = vmaxq_s8(m01_1,m01_4);
    m00_1 = vmaxq_s8(m00_1,m00_2);
    m00_1 = vmaxq_s8(m00_1,m00_3);
    m00_1 = vmaxq_s8(m00_1,m00_4);
    m10_1 = vmaxq_s8(m10_1,m10_2);
    m10_1 = vmaxq_s8(m10_1,m10_3);
    m10_1 = vmaxq_s8(m10_1,m10_4);
    m11_1 = vmaxq_s8(m11_1,m11_2);
    m11_1 = vmaxq_s8(m11_1,m11_3);
    m11_1 = vmaxq_s8(m11_1,m11_4);


    m01_1 = vqsubq_s8(m01_1,*m10_128);
    m00_1 = vqsubq_s8(m00_1,*m11_128);
    m10_1 = vqaddq_s8(m10_1,*m10_128);
    m11_1 = vqaddq_s8(m11_1,*m11_128);


    m01_1 = vmaxq_s8(m01_1,m00_1);
    m10_1 = vmaxq_s8(m10_1,m11_1);


    *ext_128 = vqsubq_s8(m10_1,m01_1);

    alpha_ptr+=8;
    beta_ptr+=8;

#endif
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  }


}



//int pi2[n],pi3[n+8],pi5[n+8],pi4[n+8],pi6[n+8],
int *pi2tab8[188],*pi5tab8[188],*pi4tab8[188],*pi6tab8[188];

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void free_td8(void)
{
  int ind;

  for (ind=0; ind<188; ind++) {
    free(pi2tab8[ind]);
    free(pi5tab8[ind]);
    free(pi4tab8[ind]);
    free(pi6tab8[ind]);
  }
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}

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void init_td8()
{
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  int ind,i,j,n,n2,pi,pi3;
  short * base_interleaver;

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  for (ind=0; ind<188; ind++) {
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    n = f1f2mat[ind].nb_bits;
    base_interleaver=il_tb+f1f2mat[ind].beg_index;
#ifdef MEX
    // This is needed for the Mex implementation to make the memory persistent
    pi2tab8[ind] = mxMalloc((n+8)*sizeof(int));
    pi5tab8[ind] = mxMalloc((n+8)*sizeof(int));
    pi4tab8[ind] = mxMalloc((n+8)*sizeof(int));
    pi6tab8[ind] = mxMalloc((n+8)*sizeof(int));
#else
    pi2tab8[ind] = malloc((n+8)*sizeof(int));
    pi5tab8[ind] = malloc((n+8)*sizeof(int));
    pi4tab8[ind] = malloc((n+8)*sizeof(int));
    pi6tab8[ind] = malloc((n+8)*sizeof(int));
#endif

    if ((n&15)>0) {
      n2 = n+8;
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    } else
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      n2 = n;

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    for (j=0,i=0; i<n2; i++,j+=16) {

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      if (j>=n2)
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        j-=(n2-1);

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      pi2tab8[ind][i] = j;
      //    printf("pi2[%d] = %d\n",i,j);
    }
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    for (i=0; i<n2; i++) {
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      pi = base_interleaver[i];//(unsigned int)threegpplte_interleaver(f1,f2,n);
      pi3 = pi2tab8[ind][pi];
      pi4tab8[ind][pi2tab8[ind][i]] = pi3;
      pi5tab8[ind][pi3] = pi2tab8[ind][i];
      pi6tab8[ind][pi] = pi2tab8[ind][i];
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    }
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  }
}

unsigned char phy_threegpplte_turbo_decoder8(short *y,
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    unsigned char *decoded_bytes,
    unsigned short n,
    unsigned short f1,
    unsigned short f2,
    unsigned char max_iterations,
    unsigned char crc_type,
    unsigned char F,
    time_stats_t *init_stats,
    time_stats_t *alpha_stats,
    time_stats_t *beta_stats,
    time_stats_t *gamma_stats,
    time_stats_t *ext_stats,
    time_stats_t *intl1_stats,
    time_stats_t *intl2_stats)
{

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  /*  y is a pointer to the input
      decoded_bytes is a pointer to the decoded output
      n is the size in bits of the coded block, with the tail */

  int n2;

  llr_t y8[3*(n+16)] __attribute__((aligned(16)));


  llr_t systematic0[n+16] __attribute__ ((aligned(16)));
  llr_t systematic1[n+16] __attribute__ ((aligned(16)));
  llr_t systematic2[n+16] __attribute__ ((aligned(16)));
  llr_t yparity1[n+16] __attribute__ ((aligned(16)));
  llr_t yparity2[n+16] __attribute__ ((aligned(16)));

  llr_t ext[n+128] __attribute__((aligned(16)));
  llr_t ext2[n+128] __attribute__((aligned(16)));

  llr_t alpha[(n+16)*8] __attribute__ ((aligned(16)));
  llr_t beta[(n+16)*8] __attribute__ ((aligned(16)));
  llr_t m11[n+16] __attribute__ ((aligned(16)));
  llr_t m10[n+16] __attribute__ ((aligned(16)));

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  //  int *pi2_p,*pi4_p,*pi5_p,*pi6_p;
  int *pi4_p,*pi5_p,*pi6_p;
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  llr_t *s,*s1,*s2,*yp1,*yp2,*yp;
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  unsigned int i,j,iind;//,pi;
  unsigned char iteration_cnt=0;
  unsigned int crc,oldcrc,crc_len;
gauthier's avatar
gauthier committed
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  uint8_t temp;
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#if defined(__x86_64__) || defined(__i386__)
  __m128i *yp128;
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  __m128i tmp128[(n+8)>>3];
  __m128i tmp, zeros=_mm_setzero_si128();
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#elif defined(__arm__)
  int8x16_t *yp128;
  int8x16_t tmp128[(n+8)>>3];
  int8x16_t tmp, zeros=vdupq_n_s8(0);
  const uint8_t __attribute__ ((aligned (16))) _Powers[16]= 
    { 1, 2, 4, 8, 16, 32, 64, 128, 1, 2, 4, 8, 16, 32, 64, 128 };
  
  // Set the powers of 2 (do it once for all, if applicable)
  uint8x16_t Powers= vld1q_u8(_Powers);
#endif
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  int offset8_flag=0;

  if (crc_type > 3) {
    msg("Illegal crc length!\n");
    return 255;
  }


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  if (init_stats) start_meas(init_stats);
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  if ((n&15)>0) {
    n2 = n+8;
    offset8_flag=1;
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  } else
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    n2 = n;


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  for (iind=0; iind < 188 && f1f2mat[iind].nb_bits != n; iind++);
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  if ( iind == 188 ) {
    msg("Illegal frame length!\n");
    return 255;
  }
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  switch (crc_type) {
  case CRC24_A:
  case CRC24_B:
    crc_len=3;
    break;
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  case CRC16:
    crc_len=2;
    break;
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  case CRC8:
    crc_len=1;
    break;
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  default:
    crc_len=3;
  }

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#if defined(__x86_64__) || defined(__i386__)

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  // note: this makes valgrind freak
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  __m128i avg=_mm_set1_epi32(0);
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  for (i=0; i<(3*(n>>4))+1; i++) {
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    __m128i tmp=_mm_abs_epi16(_mm_unpackhi_epi16(((__m128i*)y)[i],((__m128i*)y)[i]));
    avg=_mm_add_epi32(_mm_cvtepi16_epi32(_mm_abs_epi16(((__m128i*)y)[i])),avg);
    avg=_mm_add_epi32(_mm_cvtepi16_epi32(tmp),avg);
  }
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  int32_t round_avg=(_mm_extract_epi32(avg,0)+_mm_extract_epi32(avg,1)+_mm_extract_epi32(avg,2)+_mm_extract_epi32(avg,3))/(n*3);
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  //printf("avg input turbo: %d sum %d taille bloc %d\n",round_avg,round_sum,n);
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  if (round_avg < 16 )
    for (i=0,j=0; i<(3*(n2>>4))+1; i++,j+=2)
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      ((__m128i *)y8)[i] = _mm_packs_epi16(((__m128i *)y)[j],((__m128i *)y)[j+1]);
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  else if (round_avg < 32)
    for (i=0,j=0; i<(3*(n2>>4))+1; i++,j+=2)
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      ((__m128i *)y8)[i] = _mm_packs_epi16(_mm_srai_epi16(((__m128i *)y)[j],1),_mm_srai_epi16(((__m128i *)y)[j+1],1));
  else if (round_avg < 64 )
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    for (i=0,j=0; i<(3*(n2>>4))+1; i++,j+=2)
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      ((__m128i *)y8)[i] = _mm_packs_epi16(_mm_srai_epi16(((__m128i *)y)[j],2),_mm_srai_epi16(((__m128i *)y)[j+1],2));
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  else if (round_avg < 128)
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    for (i=0,j=0; i<(3*(n2>>4))+1; i++,j+=2)
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      ((__m128i *)y8)[i] = _mm_packs_epi16(_mm_srai_epi16(((__m128i *)y)[j],3),_mm_srai_epi16(((__m128i *)y)[j+1],3));
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  else
    for (i=0,j=0; i<(3*(n2>>4))+1; i++,j+=2)
      ((__m128i *)y8)[i] = _mm_packs_epi16(_mm_srai_epi16(((__m128i *)y)[j],3),_mm_srai_epi16(((__m128i *)y)[j+1],4));
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  yp128 = (__m128i*)y8;
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#elif defined(__arm__)

  int32x4_t avg=vdupq_n_s32(0);

  for (i=0; i<(3*(n>>4))+1; i++) {
    int16x8_t tmp=vabsq_s16(((int16x8_t*)y)[i]);
    avg = vqaddq_s32(avg,vaddl_s16(((int16x4_t*)&tmp)[0],((int16x4_t*)&tmp)[1]));
  }

  int32_t round_avg=(vgetq_lane_s32(avg,0)+vgetq_lane_s32(avg,1)+vgetq_lane_s32(avg,2)+vgetq_lane_s32(avg,3))/(n*3);

  //printf("avg input turbo: %d sum %d taille bloc %d\n",round_avg,round_sum,n);

  if (round_avg < 16 )
    for (i=0,j=0; i<(3*(n2>>3))+1; i++,j+=2)
      ((int8x8_t *)y8)[i] = vqmovn_s16(((int16x8_t *)y)[j]);
  else if (round_avg < 32)
    for (i=0,j=0; i<(3*(n2>>3))+1; i++,j+=2)
      ((int8x8_t *)y8)[i] = vqmovn_s16(vshrq_n_s16(((int16x8_t *)y)[j],1));
  else if (round_avg < 64 )
    for (i=0,j=0; i<(3*(n2>>3))+1; i++,j+=2)
      ((int8x8_t *)y8)[i] = vqmovn_s16(vshrq_n_s16(((int16x8_t *)y)[j],2));
  else
    for (i=0,j=0; i<(3*(n2>>3))+1; i++,j+=2)
      ((int8x8_t *)y8)[i] = vqmovn_s16(vshrq_n_s16(((int16x8_t *)y)[j],3));

  yp128 = (int8x16_t*)y8;

#endif
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  s = systematic0;
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  s1 = systematic1;
  s2 = systematic2;
  yp1 = yparity1;
  yp2 = yparity2;
  yp=y8;
#if 1
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  for (i=0; i<16 ; i++ )
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    for (j=0; j<n2; j+=16) {
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      int k=i+j;
      s[k]=*yp++;
      yp1[k]=*yp++;
      yp2[k]=*yp++;
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    }

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#endif
#if 0
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  for (i=0; i<n2; i+=16) {
    pi2_p = &pi2tab8[iind][i];

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    j=pi2_p[0];
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#if defined(__x86_64__) || defined(__i386__)
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    s[j]   = _mm_extract_epi8(yp128[0],0);
    yp1[j] = _mm_extract_epi8(yp128[0],1);
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    yp2[j] = _mm_extract_epi8(yp128[0],2);
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    j=pi2_p[1];
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    s[j]   = _mm_extract_epi8(yp128[0],3);
    yp1[j] = _mm_extract_epi8(yp128[0],4);
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    yp2[j] = _mm_extract_epi8(yp128[0],5);
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    j=pi2_p[2];
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    s[j]   = _mm_extract_epi8(yp128[0],6);
    yp1[j] = _mm_extract_epi8(yp128[0],7);
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    yp2[j] = _mm_extract_epi8(yp128[0],8);
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    j=pi2_p[3];
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    s[j]   = _mm_extract_epi8(yp128[0],9);
    yp1[j] = _mm_extract_epi8(yp128[0],10);
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    yp2[j] = _mm_extract_epi8(yp128[0],11);
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    j=pi2_p[4];
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    s[j]   = _mm_extract_epi8(yp128[0],12);
    yp1[j] = _mm_extract_epi8(yp128[0],13);
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    yp2[j] = _mm_extract_epi8(yp128[0],14);
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    j=pi2_p[5];
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    s[j]   = _mm_extract_epi8(yp128[0],15);
    yp1[j] = _mm_extract_epi8(yp128[1],0);
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    yp2[j] = _mm_extract_epi8(yp128[1],1);
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    j=pi2_p[6];
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    s[j]   = _mm_extract_epi8(yp128[1],2);
    yp1[j] = _mm_extract_epi8(yp128[1],3);
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    yp2[j] = _mm_extract_epi8(yp128[1],4);
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    j=pi2_p[7];
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    s[j]   = _mm_extract_epi8(yp128[1],5);
    yp1[j] = _mm_extract_epi8(yp128[1],6);
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    yp2[j] = _mm_extract_epi8(yp128[1],7);
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    j=pi2_p[8];
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    s[j]   = _mm_extract_epi8(yp128[1],8);
    yp1[j] = _mm_extract_epi8(yp128[1],9);
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    yp2[j] = _mm_extract_epi8(yp128[1],10);
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    j=pi2_p[9];
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    s[j]   = _mm_extract_epi8(yp128[1],11);
    yp1[j] = _mm_extract_epi8(yp128[1],12);
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    yp2[j] = _mm_extract_epi8(yp128[1],13);
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    j=pi2_p[10];
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    s[j]   = _mm_extract_epi8(yp128[1],14);
    yp1[j] = _mm_extract_epi8(yp128[1],15);
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    yp2[j] = _mm_extract_epi8(yp128[2],0);
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    j=pi2_p[11];
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    s[j]   = _mm_extract_epi8(yp128[2],1);
    yp1[j] = _mm_extract_epi8(yp128[2],2);
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    yp2[j] = _mm_extract_epi8(yp128[2],3);
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    j=pi2_p[12];
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    s[j]   = _mm_extract_epi8(yp128[2],4);
    yp1[j] = _mm_extract_epi8(yp128[2],5);
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    yp2[j] = _mm_extract_epi8(yp128[2],6);
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    j=pi2_p[13];
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    s[j]   = _mm_extract_epi8(yp128[2],7);
    yp1[j] = _mm_extract_epi8(yp128[2],8);
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    yp2[j] = _mm_extract_epi8(yp128[2],9);
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    j=pi2_p[14];
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    s[j]   = _mm_extract_epi8(yp128[2],10);
    yp1[j] = _mm_extract_epi8(yp128[2],11);
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    yp2[j] = _mm_extract_epi8(yp128[2],12);
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    j=pi2_p[15];
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    s[j]   = _mm_extract_epi8(yp128[2],13);
    yp1[j] = _mm_extract_epi8(yp128[2],14);
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    yp2[j] = _mm_extract_epi8(yp128[2],15);

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