/*
 * SPDX-License-Identifier: LicenseRef-CSSL-1.0
 */

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include "../../nrLDPCdecoder_defs.h"
#include "../../nrLDPC_types.h"                                                                                           
#include "../../nrLDPC_bnProc.h"


void nrLDPC_cnProc_BG2_generator_AVX2(const char* dir, int R)
{
  const char *ratestr[3]={"15","13","23"};

  if (R<0 || R>2) {printf("Illegal R %d\n",R); abort();}


//  system("mkdir -p ldpc_gen_files/avx2");

  char fname[FILENAME_MAX+1];
  snprintf(fname, sizeof(fname), "%s/cnProc/nrLDPC_cnProc_BG2_R%s_AVX2.h", dir, ratestr[R]);
  FILE *fd=fopen(fname,"w");
  if (fd == NULL) {
    printf("Cannot create file %s\n", fname);
    abort();
  }

  fprintf(fd,"#include <stdint.h>\n");
  fprintf(fd,"#include \"PHY/sse_intrin.h\"\n");
  fprintf(fd,"static inline void nrLDPC_cnProc_BG2_R%s_AVX2(int8_t* cnProcBuf, int8_t* cnProcBufRes, uint16_t Z) {\n",ratestr[R]);

  const uint8_t*  lut_numCnInCnGroups;
  const uint32_t* lut_startAddrCnGroups = lut_startAddrCnGroups_BG2;

  if (R==0)      lut_numCnInCnGroups = lut_numCnInCnGroups_BG2_R15;
  else if (R==1) lut_numCnInCnGroups = lut_numCnInCnGroups_BG2_R13;
  else if (R==2) lut_numCnInCnGroups = lut_numCnInCnGroups_BG2_R23;
  else { printf("aborting, illegal R %d\n",R); fclose(fd);abort();}


  // Number of CNs in Groups
  //uint32_t M;
  uint32_t j;
  uint32_t k;
  // Offset to each bit within a group in terms of 32 byte
  uint32_t bitOffsetInGroup;

  // Offsets are in units of bitOffsetInGroup (1*384/32)
  //    const uint8_t lut_idxCnProcG3[3][2] = {{12,24}, {0,24}, {0,12}};

  // =====================================================================
  // Process group with 3 BNs
  fprintf(fd,"//Process group with 3 BNs\n");
  // LUT with offsets for bits that need to be processed
  // 1. bit proc requires LLRs of 2. and 3. bit, 2.bits of 1. and 3. etc.
    // Offsets are in units of bitOffsetInGroup
    const uint8_t lut_idxCnProcG3[3][2] = {{72,144}, {0,144}, {0,72}};


  fprintf(fd,"                simde__m256i ymm0, min, sgn,ones,maxLLR;\n");
  fprintf(fd,"                ones   = simde_mm256_set1_epi8((char)1);\n");
  fprintf(fd,"                maxLLR = simde_mm256_set1_epi8((char)127);\n");
    fprintf(fd,"                uint32_t M;\n");
 

  if (lut_numCnInCnGroups[0] > 0)
    {
      // Number of groups of 32 CNs for parallel processing
      // Ceil for values not divisible by 32
     fprintf(fd," M = (%d*Z + 31)>>5;\n",lut_numCnInCnGroups[0] );

      // Set the offset to each bit within a group in terms of 32 byte
      bitOffsetInGroup = (lut_numCnInCnGroups_BG2_R15[0]*NR_LDPC_ZMAX)>>5;

      // Loop over every BN
      
      for (j=0; j<3; j++)
        {

            fprintf(fd,"            for (int i=0;i<M;i+=2) {\n");
            // Abs and sign of 32 CNs (first BN)
            //                ymm0 = p_cnProcBuf[lut_idxCnProcG3[j][0] + i];
            fprintf(fd,"                ymm0 = ((simde__m256i*)cnProcBuf)[%d+i];\n",(lut_startAddrCnGroups[0]>>5)+lut_idxCnProcG3[j][0]);
            //                sgn  = simde_mm256_sign_epi8(ones, ymm0);
            fprintf(fd,"                sgn  = simde_mm256_sign_epi8(ones, ymm0);\n");
            //                min  = simde_mm256_abs_epi8(ymm0);
            fprintf(fd,"                min  = simde_mm256_abs_epi8(ymm0);\n");
            
            // 32 CNs of second BN
            //                ymm0 = p_cnProcBuf[lut_idxCnProcG3[j][1] + i];
            fprintf(fd,"                ymm0 = ((simde__m256i*)cnProcBuf)[%d+i];\n",(lut_startAddrCnGroups[0]>>5)+lut_idxCnProcG3[j][1]);
            
            //                min  = simde_mm256_min_epu8(min, simde_mm256_abs_epi8(ymm0));
            fprintf(fd,"                min  = simde_mm256_min_epu8(min, simde_mm256_abs_epi8(ymm0));\n");
            
            //                sgn  = simde_mm256_sign_epi8(sgn, ymm0);
            fprintf(fd,"                sgn  = simde_mm256_sign_epi8(sgn, ymm0);\n");
            
            // Store result
            //                min = simde_mm256_min_epu8(min, maxLLR); // 128 in epi8 is -127
            fprintf(fd,"                min = simde_mm256_min_epu8(min, maxLLR);\n");
            //                *p_cnProcBufResBit = simde_mm256_sign_epi8(min, sgn);
            //                p_cnProcBufResBit++;
            fprintf(fd,"                ((simde__m256i*)cnProcBufRes)[%d+i] = simde_mm256_sign_epi8(min, sgn);\n",(lut_startAddrCnGroups[0]>>5)+(j*bitOffsetInGroup));

            // Abs and sign of 32 CNs (first BN)
            //                ymm0 = p_cnProcBuf[lut_idxCnProcG3[j][0] + i];
            fprintf(fd,"                ymm0 = ((simde__m256i*)cnProcBuf)[%d+i];\n",(lut_startAddrCnGroups[0]>>5)+lut_idxCnProcG3[j][0]+1);
            //                sgn  = simde_mm256_sign_epi8(ones, ymm0);
            fprintf(fd,"                sgn  = simde_mm256_sign_epi8(ones, ymm0);\n");
            //                min  = simde_mm256_abs_epi8(ymm0);
            fprintf(fd,"                min  = simde_mm256_abs_epi8(ymm0);\n");
      
            fprintf(fd,"            }\n");
          }
      }

  // =====================================================================
  // Process group with 4 BNs
  fprintf(fd,"//Process group with 4 BNs\n");
  
 // Offset is 20*384/32 = 240
    const uint16_t lut_idxCnProcG4[4][3] = {{240,480,720}, {0,480,720}, {0,240,720}, {0,240,480}};

    if (lut_numCnInCnGroups[1] > 0)
    {
            // Number of groups of 32 CNs for parallel processing
            // Ceil for values not divisible by 32
        fprintf(fd," M = (%d*Z + 31)>>5;\n",lut_numCnInCnGroups[1] );

            // Set the offset to each bit within a group in terms of 32 byte
            bitOffsetInGroup = (lut_numCnInCnGroups_BG2_R15[1]*NR_LDPC_ZMAX)>>5;

            // Loop over every BN
            
          for (j=0; j<4; j++)
          {

          // Loop over CNs

          fprintf(fd,"            for (int i=0;i<M;i++) {\n");
          // Abs and sign of 32 CNs (first BN)
          //                ymm0 = p_cnProcBuf[lut_idxCnProcG3[j][0] + i];
          fprintf(fd,"                ymm0 = ((simde__m256i*)cnProcBuf)[%d+i];\n",(lut_startAddrCnGroups[1]>>5)+lut_idxCnProcG4[j][0]);
          //                sgn  = simde_mm256_sign_epi8(ones, ymm0);
           fprintf(fd,"                sgn  = simde_mm256_sign_epi8(ones, ymm0);\n");
          //                min  = simde_mm256_abs_epi8(ymm0);
          fprintf(fd,"                min  = simde_mm256_abs_epi8(ymm0);\n");
            
            
          // Loop over BNs
            for (k=1; k<3; k++)
            {
            fprintf(fd,"                ymm0 = ((simde__m256i*)cnProcBuf)[%d+i];\n",(lut_startAddrCnGroups[1]>>5)+lut_idxCnProcG4[j][k]);
                
            //                min  = simde_mm256_min_epu8(min, simde_mm256_abs_epi8(ymm0));
            fprintf(fd,"                min  = simde_mm256_min_epu8(min, simde_mm256_abs_epi8(ymm0));\n");
                
            //                sgn  = simde_mm256_sign_epi8(sgn, ymm0);
                fprintf(fd,"                sgn  = simde_mm256_sign_epi8(sgn, ymm0);\n");
            }
            
            // Store result
            //                min = simde_mm256_min_epu8(min, maxLLR); // 128 in epi8 is -127
            fprintf(fd,"                min = simde_mm256_min_epu8(min, maxLLR);\n");
            //                *p_cnProcBufResBit = simde_mm256_sign_epi8(min, sgn);
                //                p_cnProcBufResBit++;
            fprintf(fd,"                ((simde__m256i*)cnProcBufRes)[%d+i] = simde_mm256_sign_epi8(min, sgn);\n",(lut_startAddrCnGroups[1]>>5)+(j*bitOffsetInGroup));
            fprintf(fd,"            }\n");
          }
      }


  // =====================================================================
  // Process group with 5 BNs
    fprintf(fd,"//Process group with 5 BNs\n");

    // Offset is 9*384/32 = 108
    const uint16_t lut_idxCnProcG5[5][4] = {{108,216,324,432}, {0,216,324,432},
                                            {0,108,324,432}, {0,108,216,432}, {0,108,216,324}};



    if (lut_numCnInCnGroups[2] > 0)
    {
      // Number of groups of 32 CNs for parallel processing
      // Ceil for values not divisible by 32
    fprintf(fd," M = (%d*Z + 31)>>5;\n",lut_numCnInCnGroups[2] );
      // Set the offset to each bit within a group in terms of 32 byte
      bitOffsetInGroup = (lut_numCnInCnGroups_BG2_R15[2]*NR_LDPC_ZMAX)>>5;

      // Loop over every BN
      
      for (j=0; j<5; j++)
	    {

         
         fprintf(fd,"            for (int i=0;i<M;i++) {\n");
        // Abs and sign of 32 CNs (first BN)
        //                ymm0 = p_cnProcBuf[lut_idxCnProcG3[j][0] + i];
        fprintf(fd,"                ymm0 = ((simde__m256i*)cnProcBuf)[%d+i];\n",(lut_startAddrCnGroups[2]>>5)+lut_idxCnProcG5[j][0]);
        //                sgn  = simde_mm256_sign_epi8(ones, ymm0);
        fprintf(fd,"                sgn  = simde_mm256_sign_epi8(ones, ymm0);\n");
        //                min  = simde_mm256_abs_epi8(ymm0);
        fprintf(fd,"                min  = simde_mm256_abs_epi8(ymm0);\n");
        
        
        // Loop over BNs
        for (k=1; k<4; k++)
        {
          fprintf(fd,"                ymm0 = ((simde__m256i*)cnProcBuf)[%d+i];\n",(lut_startAddrCnGroups[2]>>5)+lut_idxCnProcG5[j][k]);
            
          //                min  = simde_mm256_min_epu8(min, simde_mm256_abs_epi8(ymm0));
          fprintf(fd,"                min  = simde_mm256_min_epu8(min, simde_mm256_abs_epi8(ymm0));\n");
            
          //                sgn  = simde_mm256_sign_epi8(sgn, ymm0);
          fprintf(fd,"                sgn  = simde_mm256_sign_epi8(sgn, ymm0);\n");
        }
        
          // Store result
        //                min = simde_mm256_min_epu8(min, maxLLR); // 128 in epi8 is -127
        fprintf(fd,"                min = simde_mm256_min_epu8(min, maxLLR);\n");
        //                *p_cnProcBufResBit = simde_mm256_sign_epi8(min, sgn);
        fprintf(fd,"                ((simde__m256i*)cnProcBufRes)[%d+i] = simde_mm256_sign_epi8(min, sgn);\n",(lut_startAddrCnGroups[2]>>5)+(j*bitOffsetInGroup));
        fprintf(fd,"           }\n");
      }
    }

  // =====================================================================
  // Process group with 6 BNs
  fprintf(fd,"//Process group with 6 BNs\n");
    // Offset is 3*384/32 = 36
  const uint16_t lut_idxCnProcG6[6][5] = {{36,72,108,144,180}, {0,72,108,144,180},
                                            {0,36,108,144,180}, {0,36,72,144,180},
                                            {0,36,72,108,180}, {0,36,72,108,144}};


  if (lut_numCnInCnGroups[3] > 0)
  {
      // Number of groups of 32 CNs for parallel processing
      // Ceil for values not divisible by 32
      fprintf(fd, "M = (%d*Z + 31)>>5;\n",lut_numCnInCnGroups[3] );

      // Set the offset to each bit within a group in terms of 32 byte
      bitOffsetInGroup = (lut_numCnInCnGroups_BG2_R15[3]*NR_LDPC_ZMAX)>>5;

      // Loop over every BN
      
    for (j=0; j<6; j++)
    {
	

	    // Loop over CNs
	 
	    fprintf(fd,"            for (int i=0;i<M;i++) {\n");
	    // Abs and sign of 32 CNs (first BN)
	    //                ymm0 = p_cnProcBuf[lut_idxCnProcG3[j][0] + i];
	    fprintf(fd,"                ymm0 = ((simde__m256i*)cnProcBuf)[%d+i];\n",(lut_startAddrCnGroups[3]>>5)+lut_idxCnProcG6[j][0]);
	    //                sgn  = simde_mm256_sign_epi8(ones, ymm0);
	    fprintf(fd,"                sgn  = simde_mm256_sign_epi8(ones, ymm0);\n");
	   //                min  = simde_mm256_abs_epi8(ymm0);
	    fprintf(fd,"                min  = simde_mm256_abs_epi8(ymm0);\n");
	  
	  
	    // Loop over BNs
	    for (k=1; k<5; k++)
	    {
	    fprintf(fd,"                ymm0 = ((simde__m256i*)cnProcBuf)[%d+i];\n",(lut_startAddrCnGroups[3]>>5)+lut_idxCnProcG6[j][k]);
	      
	    //                min  = simde_mm256_min_epu8(min, simde_mm256_abs_epi8(ymm0));
	    fprintf(fd,"                min  = simde_mm256_min_epu8(min, simde_mm256_abs_epi8(ymm0));\n");
	      
	    //                sgn  = simde_mm256_sign_epi8(sgn, ymm0);
	    fprintf(fd,"                sgn  = simde_mm256_sign_epi8(sgn, ymm0);\n");
	    }
	  
      // Store result
      //                min = simde_mm256_min_epu8(min, maxLLR); // 128 in epi8 is -127
      fprintf(fd,"                min = simde_mm256_min_epu8(min, maxLLR);\n");
      //                *p_cnProcBufResBit = simde_mm256_sign_epi8(min, sgn);
      //                p_cnProcBufResBit++;
      fprintf(fd,"                ((simde__m256i*)cnProcBufRes)[%d+i] = simde_mm256_sign_epi8(min, sgn);\n",(lut_startAddrCnGroups[3]>>5)+(j*bitOffsetInGroup));
      fprintf(fd,"            }\n");
	  }
  }



  // =====================================================================
  // Process group with 8 BNs
  fprintf(fd,"//Process group with 8 BNs\n");
 // Offset is 2*384/32 = 24
    const uint8_t lut_idxCnProcG8[8][7] = {{24,48,72,96,120,144,168}, {0,48,72,96,120,144,168},
                                           {0,24,72,96,120,144,168}, {0,24,48,96,120,144,168},
                                           {0,24,48,72,120,144,168}, {0,24,48,72,96,144,168},
                                           {0,24,48,72,96,120,168}, {0,24,48,72,96,120,144}};






    if (lut_numCnInCnGroups[4] > 0)
    {
      // Number of groups of 32 CNs for parallel processing
      // Ceil for values not divisible by 32
     fprintf(fd, "M = (%d*Z + 31)>>5;\n",lut_numCnInCnGroups[4] );

      // Set the offset to each bit within a group in terms of 32 byte
      bitOffsetInGroup = (lut_numCnInCnGroups_BG2_R15[4]*NR_LDPC_ZMAX)>>5;

      // Loop over every BN
      
      for (j=0; j<8; j++)
      {

	      // Loop over CNs
        fprintf(fd,"            for (int i=0;i<M;i++) {\n");
        // Abs and sign of 32 CNs (first BN)
        //                ymm0 = p_cnProcBuf[lut_idxCnProcG3[j][0] + i];
        fprintf(fd,"                ymm0 = ((simde__m256i*)cnProcBuf)[%d+i];\n",(lut_startAddrCnGroups[4]>>5)+lut_idxCnProcG8[j][0]);
        //                sgn  = simde_mm256_sign_epi8(ones, ymm0);
        fprintf(fd,"                sgn  = simde_mm256_sign_epi8(ones, ymm0);\n");
        //                min  = simde_mm256_abs_epi8(ymm0);
        fprintf(fd,"                min  = simde_mm256_abs_epi8(ymm0);\n");
        
	      // Loop over BNs
          for (k=1; k<7; k++)
          {
          fprintf(fd,"                ymm0 = ((simde__m256i*)cnProcBuf)[%d+i];\n",(lut_startAddrCnGroups[4]>>5)+lut_idxCnProcG8[j][k]);
            
          //                min  = simde_mm256_min_epu8(min, simde_mm256_abs_epi8(ymm0));
          fprintf(fd,"                min  = simde_mm256_min_epu8(min, simde_mm256_abs_epi8(ymm0));\n");
            
            //                sgn  = simde_mm256_sign_epi8(sgn, ymm0);
          fprintf(fd,"                sgn  = simde_mm256_sign_epi8(sgn, ymm0);\n");
          
          }
	  
	        // Store result
          //                min = simde_mm256_min_epu8(min, maxLLR); // 128 in epi8 is -127
          fprintf(fd,"                min = simde_mm256_min_epu8(min, maxLLR);\n");
          //                *p_cnProcBufResBit = simde_mm256_sign_epi8(min, sgn);
          //                p_cnProcBufResBit++;
          fprintf(fd,"                ((simde__m256i*)cnProcBufRes)[%d+i] = simde_mm256_sign_epi8(min, sgn);\n",(lut_startAddrCnGroups[4]>>5)+(j*bitOffsetInGroup));
          fprintf(fd,"              }\n");
        }
    }

 
  // =====================================================================
  // Process group with 10 BNs
  fprintf(fd,"//Process group with 10 BNs\n");

    const uint8_t lut_idxCnProcG10[10][9] = {{24,48,72,96,120,144,168,192,216}, {0,48,72,96,120,144,168,192,216},
                                             {0,24,72,96,120,144,168,192,216}, {0,24,48,96,120,144,168,192,216},
                                             {0,24,48,72,120,144,168,192,216}, {0,24,48,72,96,144,168,192,216},
                                             {0,24,48,72,96,120,168,192,216}, {0,24,48,72,96,120,144,192,216},
                                             {0,24,48,72,96,120,144,168,216}, {0,24,48,72,96,120,144,168,192}};





    if (lut_numCnInCnGroups[5] > 0)
    {
      // Number of groups of 32 CNs for parallel processing
      // Ceil for values not divisible by 32
    fprintf(fd, "M = (%d*Z + 31)>>5;\n",lut_numCnInCnGroups[5] );

      // Set the offset to each bit within a group in terms of 32 byte
      bitOffsetInGroup = (lut_numCnInCnGroups_BG2_R15[5]*NR_LDPC_ZMAX)>>5;

      // Loop over every BN
      
      for (j=0; j<10; j++)
      {

      // Loop over CNs

      fprintf(fd,"            for (int i=0;i<M;i++) {\n");
      // Abs and sign of 32 CNs (first BN)
        //                ymm0 = p_cnProcBuf[lut_idxCnProcG3[j][0] + i];
      fprintf(fd,"                ymm0 = ((simde__m256i*)cnProcBuf)[%d+i];\n",(lut_startAddrCnGroups[5]>>5)+lut_idxCnProcG10[j][0]);
        //                sgn  = simde_mm256_sign_epi8(ones, ymm0);
      fprintf(fd,"                sgn  = simde_mm256_sign_epi8(ones, ymm0);\n");
        //                min  = simde_mm256_abs_epi8(ymm0);
      fprintf(fd,"                min  = simde_mm256_abs_epi8(ymm0);\n");
        
	  
	  // Loop over BNs
	     for (k=1; k<9; k++)
	     {
          fprintf(fd,"                ymm0 = ((simde__m256i*)cnProcBuf)[%d+i];\n",(lut_startAddrCnGroups[5]>>5)+lut_idxCnProcG10[j][k]);
            
            //                min  = simde_mm256_min_epu8(min, simde_mm256_abs_epi8(ymm0));
          fprintf(fd,"                min  = simde_mm256_min_epu8(min, simde_mm256_abs_epi8(ymm0));\n");
            
            //                sgn  = simde_mm256_sign_epi8(sgn, ymm0);
          fprintf(fd,"                sgn  = simde_mm256_sign_epi8(sgn, ymm0);\n");
        }
	  
          // Store result
            //                min = simde_mm256_min_epu8(min, maxLLR); // 128 in epi8 is -127
          fprintf(fd,"                min = simde_mm256_min_epu8(min, maxLLR);\n");
            //                *p_cnProcBufResBit = simde_mm256_sign_epi8(min, sgn);
            //                p_cnProcBufResBit++;
          fprintf(fd,"                ((simde__m256i*)cnProcBufRes)[%d+i] = simde_mm256_sign_epi8(min, sgn);\n",(lut_startAddrCnGroups[5]>>5)+(j*bitOffsetInGroup));
          fprintf(fd,"            }\n");
      }
    }


  fprintf(fd,"}\n");
  fclose(fd);
}//end of the function  nrLDPC_cnProc_BG2

