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

#include <stdio.h>
#include <stdint.h>
#include "PHY/sse_intrin.h"
#include "../../nrLDPCdecoder_defs.h"
#include "../../nrLDPC_types.h"


void nrLDPC_bnProcPc_BG2_generator_128(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");

  char fname[FILENAME_MAX+1];
  snprintf(fname, sizeof(fname), "%s/bnProcPc128/nrLDPC_bnProcPc_BG2_R%s_128.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_bnProcPc_BG2_R%s_128(int8_t* bnProcBuf,int8_t* bnProcBufRes,int8_t* llrRes ,  int8_t* llrProcBuf, uint16_t Z  ) {\n",ratestr[R]);
    const uint8_t*  lut_numBnInBnGroups;
    const uint32_t* lut_startAddrBnGroups;
    const uint16_t* lut_startAddrBnGroupsLlr;
    if (R==0) {


      lut_numBnInBnGroups =  lut_numBnInBnGroups_BG2_R15;
      lut_startAddrBnGroups = lut_startAddrBnGroups_BG2_R15;
      lut_startAddrBnGroupsLlr = lut_startAddrBnGroupsLlr_BG2_R15;

    }
    else if (R==1){

      lut_numBnInBnGroups =  lut_numBnInBnGroups_BG2_R13;
      lut_startAddrBnGroups = lut_startAddrBnGroups_BG2_R13;
      lut_startAddrBnGroupsLlr = lut_startAddrBnGroupsLlr_BG2_R13;
    }
    else if (R==2) {

      lut_numBnInBnGroups = lut_numBnInBnGroups_BG2_R23;
      lut_startAddrBnGroups = lut_startAddrBnGroups_BG2_R23;
      lut_startAddrBnGroupsLlr = lut_startAddrBnGroupsLlr_BG2_R23;
    }
  else { printf("aborting, illegal R %d\n",R); fclose(fd);abort();}

        // Number of BNs in Groups
    uint32_t k;
    // Offset to each bit within a group in terms of 32 Byte
    uint32_t cnOffsetInGroup;
    uint8_t idxBnGroup = 0;

    fprintf(fd,"  // Process group with 1 CN\n");
    fprintf(fd,"        uint32_t M = (%d*Z + 15)>>4;\n",lut_numBnInBnGroups[0]);

    fprintf(fd,"        simde__m128i* p_bnProcBuf    = (simde__m128i*) &bnProcBuf    [%u];\n", lut_startAddrBnGroups[idxBnGroup]);
    fprintf(fd,"        simde__m128i* p_bnProcBufRes = (simde__m128i*) &bnProcBufRes [%u];\n", lut_startAddrBnGroups[idxBnGroup]);
    fprintf(fd,"        simde__m128i* p_llrProcBuf   = (simde__m128i*) &llrProcBuf   [%d];\n", lut_startAddrBnGroupsLlr[idxBnGroup]);
    fprintf(fd,"        simde__m128i* p_llrRes       = (simde__m128i*) &llrRes       [%d];\n", lut_startAddrBnGroupsLlr[idxBnGroup]);
    fprintf(fd,"        simde__m128i ymm0, ymm1, ymmRes0, ymmRes1;\n");


    fprintf(fd,"        for (int i=0;i<M;i++) {\n");
    fprintf(fd,"          p_bnProcBufRes[i] = p_llrProcBuf[i];\n");
    fprintf(fd,"          ymm0 = simde_mm_cvtepi8_epi16(p_bnProcBuf [i]);\n");
    fprintf(fd,"          ymm1 = simde_mm_cvtepi8_epi16(p_llrProcBuf[i]);\n");
    fprintf(fd,"          ymmRes0 = simde_mm_adds_epi16(ymm0, ymm1);\n");
    fprintf(fd,"          ymm0 = simde_mm_cvtepi8_epi16(simde_mm_srli_si128(p_bnProcBuf [i],8));\n");
    fprintf(fd,"          ymm1 = simde_mm_cvtepi8_epi16(simde_mm_srli_si128(p_llrProcBuf[i],8));\n");
    fprintf(fd,"          ymmRes1 = simde_mm_adds_epi16(ymm0, ymm1);\n");
    fprintf(fd,"          *p_llrRes = simde_mm_packs_epi16(ymmRes0, ymmRes1);\n");
    fprintf(fd,"          p_llrRes++;\n");
    fprintf(fd,"        }\n");
 
    
    for (uint32_t cnidx=1;cnidx<30;cnidx++) {
    // Process group with 4 CNs

       if (lut_numBnInBnGroups[cnidx] > 0)
       {
        // If elements in group move to next address
        idxBnGroup++;

        fprintf(fd,"  M = (%d*Z + 15)>>4;\n",lut_numBnInBnGroups[cnidx]);

        // Set the offset to each CN within a group in terms of 16 Byte
        cnOffsetInGroup = (lut_numBnInBnGroups[cnidx]*NR_LDPC_ZMAX)>>4;

        // Set pointers to start of group 2
        fprintf(fd,"  p_bnProcBuf     = (simde__m128i*) &bnProcBuf    [%u];\n", lut_startAddrBnGroups[idxBnGroup]);
        fprintf(fd,"  p_llrProcBuf    = (simde__m128i*) &llrProcBuf   [%d];\n", lut_startAddrBnGroupsLlr[idxBnGroup]);
        fprintf(fd,"  p_llrRes        = (simde__m128i*) &llrRes       [%d];\n", lut_startAddrBnGroupsLlr[idxBnGroup]);

        // Loop over BNs
        fprintf(fd,"        for (int i=0;i<M;i++) {\n");
            // First 16 LLRs of first CN
        fprintf(fd,"        ymmRes0 = simde_mm_cvtepi8_epi16(p_bnProcBuf [i]);\n");
        fprintf(fd,"        ymmRes1 = simde_mm_cvtepi8_epi16(simde_mm_srli_si128(p_bnProcBuf [i],8));\n");

            // Loop over CNs
        for (k=1; k<=cnidx; k++)
        {
           fprintf(fd,"        ymm0 = simde_mm_cvtepi8_epi16(p_bnProcBuf[%u + i]);\n", k * cnOffsetInGroup);
           fprintf(fd,"        ymmRes0 = simde_mm_adds_epi16(ymmRes0, ymm0);\n");

           fprintf(fd,"        ymm1 = simde_mm_cvtepi8_epi16(simde_mm_srli_si128(p_bnProcBuf[%u + i],8));\n", k * cnOffsetInGroup);

           fprintf(fd, "       ymmRes1 = simde_mm_adds_epi16(ymmRes1, ymm1); \n");
        }

            // Add LLR from receiver input
        fprintf(fd,"        ymm0    = simde_mm_cvtepi8_epi16(p_llrProcBuf[i]);\n");
        fprintf(fd,"        ymmRes0 = simde_mm_adds_epi16(ymmRes0, ymm0);\n");

        fprintf(fd,"        ymm1    = simde_mm_cvtepi8_epi16(simde_mm_srli_si128(p_llrProcBuf[i],8));\n");
        fprintf(fd,"        ymmRes1 = simde_mm_adds_epi16(ymmRes1, ymm1);\n");

            // Pack results back to epi8
        fprintf(fd,"        *p_llrRes = simde_mm_packs_epi16(ymmRes0, ymmRes1);\n");
        fprintf(fd,"        p_llrRes++;\n");

        fprintf(fd,"   }\n");
       }

    }


    fprintf(fd,"}\n");
    fclose(fd);
}//end of the function  nrLDPC_bnProcPc_BG2








