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openairinterface5g/openair1/PHY/CODING/nrLDPC_encoder/ldpc_encoder_optim8segmulti.c
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Romain BeurdoucheandLaurent Thomas 06c81030dc fix(nrLDPC_coding_segment_encoder): address review 
1. nrLDPC_coding_segment_encoding: Clarifying encoder parameters
   The way the encoder implementation params was used could be made clearer:
   * `macro_num` was always used in order to calculate segment indexes.
     It is clearer to pass directly the first segment index.
   * The initialisation of a common implementation parameters structure can be made clearer.

2. nrLDPC_coding_segment_encoder: Remove multi segment dimension in encoder output
   The output of `LDPCencoder` was a 2D unsigned char array.
   But all the segments were actually packed in the first segment, 8 bits of different segments per byte of the first segment.
   So the first dimension was useless. This commit removes this dimension.

3. nrLDPC_coding_segment_encoder: Rename `nrLDPC_prepare_TB_encoding` into `nrLDPC_launch_TB_encoding`

4. nrLDPC_coding_segment_encoder: Remove the useless second rate matching for E2, one rate matching with max(E, E2) does the job.

5. nr_interleaving_ldpc: cleanup
   Rewrite code to use different SIMD sizes in a linear fashion.
   This means cascading preprocessor directives are used to start from a high SIMD size an decrease it progressively.

6. ldpc_encoder_optim8segmulti: linear usage of SIMD
   Use cascading preprocessor directives to include different SIMD sizes and types depending on which are available on the system.
   The different loops use a common index that is progressively incremented.
   Also add AVX512 version of bits distribution from 8 segments into one byte.

Co-authored-by: Laurent Thomas <laurent.thomas@open-cells.com>
2025-05-13 14:08:33 +00:00

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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.openairinterface.org/?page_id=698
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
/*! \file ldpc_encoder_optim8segmulti.c
* \brief Defines the optimized LDPC encoder
* \author Florian Kaltenberger, Raymond Knopp, Kien le Trung (Eurecom)
* \email openair_tech@eurecom.fr
* \date 27-03-2018
* \version 1.0
* \note
* \warning
*/
#include <stdlib.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
#include "assertions.h"
#include "common/utils/LOG/log.h"
#include "time_meas.h"
#include "openair1/PHY/CODING/nrLDPC_defs.h"
#include "PHY/sse_intrin.h"
#include "openair1/PHY/CODING/nrLDPC_extern.h"
#include "ldpc_encode_parity_check.c"
#include "ldpc_generate_coefficient.c"
int LDPCencoder(uint8_t **input, uint8_t *output, encoder_implemparams_t *impp)
{
//set_log(PHY, 4);
int Zc = impp->Zc;
int Kb = impp->Kb;
short block_length = impp->K;
short BG = impp->BG;
int nrows=0,ncols=0;
int rate=3;
int no_punctured_columns,removed_bit;
//Table of possible lifting sizes
char temp;
int simd_size;
unsigned int macro_segment, macro_segment_end;
macro_segment = impp->first_seg;
macro_segment_end = (impp->n_segments > impp->first_seg + 8) ? impp->first_seg + 8 : impp->n_segments;
///printf("macro_segment: %d\n", macro_segment);
///printf("macro_segment_end: %d\n", macro_segment_end );
//determine number of bits in codeword
if (BG==1)
{
nrows=46; //parity check bits
ncols=22; //info bits
rate=3;
}
else if (BG==2)
{
nrows=42; //parity check bits
ncols=10; // info bits
rate=5;
}
#ifdef DEBUG_LDPC
LOG_D(PHY,"ldpc_encoder_optim_8seg: BG %d, Zc %d, Kb %d, block_length %d, segments %d\n",BG,Zc,Kb,block_length,impp->n_segments);
LOG_D(PHY,"ldpc_encoder_optim_8seg: PDU (seg 0) %x %x %x %x\n",input[0][0],input[0][1],input[0][2],input[0][3]);
#endif
AssertFatal(Zc > 0, "no valid Zc found for block length %d\n", block_length);
if ((Zc&31) > 0) simd_size = 16;
#ifdef __AVX512F__
else if ((BG==1) && Zc==384) simd_size =64;
#endif
else simd_size=32;
unsigned char cc[22*Zc] __attribute__((aligned(64))); //padded input, unpacked, max size
unsigned char dd[46*Zc] __attribute__((aligned(64))); //coded parity part output, unpacked, max size
// calculate number of punctured bits
no_punctured_columns=(int)((nrows-2)*Zc+block_length-block_length*rate)/Zc;
removed_bit=(nrows-no_punctured_columns-2) * Zc+block_length-(int)(block_length*rate);
//printf("%d\n",no_punctured_columns);
//printf("%d\n",removed_bit);
// unpack input
memset(cc,0,sizeof(cc));
memset(dd,0,sizeof(dd));
if(impp->tinput != NULL) start_meas(impp->tinput);
//interleave up to 8 transport-block segements at a time
unsigned int i_byte = 0;
#if defined(__AVX512F__) && defined(__AVX512BW__) && defined(__AVX512VBMI__)
const __m512i masks5[8] = { _mm512_set1_epi8(0x1), _mm512_set1_epi8(0x2),
_mm512_set1_epi8(0x4), _mm512_set1_epi8(0x8),
_mm512_set1_epi8(0x10), _mm512_set1_epi8(0x20),
_mm512_set1_epi8(0x40), _mm512_set1_epi8(0x80)};
const __m512i zero512 = _mm512_setzero_si512();
const uint8_t perm[64]__attribute__((aligned(64))) = {7,6,5,4,3,2,1,0, 15,14,13,12,11,10,9,8,
23,22,21,20,19,18,17,16, 31,30,29,28,27,26,25,24,
39,38,37,36,35,34,33,32, 47,46,45,44,43,42,41,40,
55,54,53,52,51,50,49,48, 63,62,61,60,59,58,57,56};
register __m512i c512;
for (; i_byte < ((block_length >> 6) << 6); i_byte += 64) {
unsigned int i = i_byte >> 6;
c512 = _mm512_mask_blend_epi8(((uint64_t *)&input[macro_segment][0])[i], zero512, masks5[0]);
for (int j = macro_segment + 1; j < macro_segment_end; j++) {
c512 = _mm512_or_si512(c512, _mm512_mask_blend_epi8(((uint64_t *)&input[j][0])[i], zero512, masks5[j - macro_segment]));
}
c512 = _mm512_permutexvar_epi8(*(__m512i*)perm, c512);
((__m512i *)cc)[i] = c512;
}
#endif
#ifndef __aarch64__
simde__m256i shufmask = simde_mm256_set_epi64x(0x0303030303030303, 0x0202020202020202,0x0101010101010101, 0x0000000000000000);
simde__m256i andmask = simde_mm256_set1_epi64x(0x0102040810204080); // every 8 bits -> 8 bytes, pattern repeats.
simde__m256i zero256 = simde_mm256_setzero_si256();
simde__m256i masks[8];
register simde__m256i c256;
masks[0] = simde_mm256_set1_epi8(0x1);
masks[1] = simde_mm256_set1_epi8(0x2);
masks[2] = simde_mm256_set1_epi8(0x4);
masks[3] = simde_mm256_set1_epi8(0x8);
masks[4] = simde_mm256_set1_epi8(0x10);
masks[5] = simde_mm256_set1_epi8(0x20);
masks[6] = simde_mm256_set1_epi8(0x40);
masks[7] = simde_mm256_set1_epi8(0x80);
for (; i_byte < ((block_length >> 5 ) << 5); i_byte += 32) {
unsigned int i = i_byte >> 5;
c256 = simde_mm256_and_si256(simde_mm256_cmpeq_epi8(simde_mm256_andnot_si256(simde_mm256_shuffle_epi8(simde_mm256_set1_epi32(((uint32_t*)input[macro_segment])[i]), shufmask),andmask),zero256),masks[0]);
for (int j=macro_segment+1; j < macro_segment_end; j++) {
c256 = simde_mm256_or_si256(simde_mm256_and_si256(simde_mm256_cmpeq_epi8(simde_mm256_andnot_si256(simde_mm256_shuffle_epi8(simde_mm256_set1_epi32(((uint32_t*)input[j])[i]), shufmask),andmask),zero256),masks[j-macro_segment]),c256);
}
((simde__m256i *)cc)[i] = c256;
}
#endif
#ifdef __aarch64__
simde__m128i shufmask = simde_mm_set_epi64x(0x0101010101010101, 0x0000000000000000);
simde__m128i andmask = simde_mm_set1_epi64x(0x0102040810204080); // every 8 bits -> 8 bytes, pattern repeats.
simde__m128i zero128 = simde_mm_setzero_si128();
simde__m128i masks[8];
register simde__m128i c128;
masks[0] = simde_mm_set1_epi8(0x1);
masks[1] = simde_mm_set1_epi8(0x2);
masks[2] = simde_mm_set1_epi8(0x4);
masks[3] = simde_mm_set1_epi8(0x8);
masks[4] = simde_mm_set1_epi8(0x10);
masks[5] = simde_mm_set1_epi8(0x20);
masks[6] = simde_mm_set1_epi8(0x40);
masks[7] = simde_mm_set1_epi8(0x80);
for (; i_byte < ((block_length >> 4 ) << 4); i_byte += 16) {
unsigned int i = i_byte >> 4;
c128 = simde_mm_and_si128(simde_mm_cmpeq_epi8(simde_mm_andnot_si128(simde_mm_shuffle_epi8(simde_mm_set1_epi16(((uint16_t*)input[macro_segment])[i]), shufmask),andmask),zero128),masks[0]);
for (int j=macro_segment+1; j < macro_segment_end; j++) {
c128 = simde_mm_or_si128(simde_mm_and_si128(simde_mm_cmpeq_epi8(simde_mm_andnot_si128(simde_mm_shuffle_epi8(simde_mm_set1_epi32(((uint16_t*)input[j])[i]), shufmask),andmask),zero128),masks[j-macro_segment]),c128);
}
((simde__m128i *)cc)[i] = c128;
}
#endif
for (; i_byte < block_length; i_byte++) {
unsigned int i = i_byte;
for (int j = macro_segment; j < macro_segment_end; j++) {
temp = (input[j][i/8]&(128>>(i&7)))>>(7-(i&7));
cc[i] |= (temp << (j-macro_segment));
}
}
if(impp->tinput != NULL) stop_meas(impp->tinput);
if ((BG==1 && Zc>=176) || (BG==2 && Zc>=72)) {
// extend matrix
if(impp->tprep != NULL) start_meas(impp->tprep);
if(impp->tprep != NULL) stop_meas(impp->tprep);
//parity check part
if(impp->tparity != NULL) start_meas(impp->tparity);
encode_parity_check_part_optim(cc, dd, BG, Zc, Kb, simd_size, ncols);
if(impp->tparity != NULL) stop_meas(impp->tparity);
}
else {
if (encode_parity_check_part_orig(cc, dd, BG, Zc, Kb, block_length)!=0) {
printf("Problem with encoder\n");
return(-1);
}
}
memcpy(output,&cc[2*Zc],(block_length-(2*Zc)));
memcpy(output+block_length-(2*Zc),dd,((nrows-no_punctured_columns) * Zc-removed_bit));
return 0;
}
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