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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 PHY/CODING/nrSmallBlock/decodeSmallBlock.c
* \brief
* \author Turker Yilmaz
* \date 2019
* \version 0.1
* \company EURECOM
* \email turker.yilmaz@eurecom.fr
* \note
* \warning
*/
#include "PHY/CODING/nrSmallBlock/nr_small_block_defs.h"
#include "assertions.h"
#include "PHY/sse_intrin.h"
//#define DEBUG_DECODESMALLBLOCK
//input = [d̂_0] [d̂_1] [d̂_2] ... [d̂_31]
//output = [? ... ? ĉ_K-1 ... ĉ_2 ĉ_1 ĉ_0]
uint16_t decodeSmallBlock(int8_t *in, uint8_t len){
uint16_t out = 0;
AssertFatal(len >= 3 && len <= 11, "[decodeSmallBlock] Message Length = %d (Small Block Coding is only defined for input lengths 3 to 11)", len);
if(len<7) {
int16_t Rhat[NR_SMALL_BLOCK_CODED_BITS] = {0}, Rhatabs[NR_SMALL_BLOCK_CODED_BITS] = {0};
uint16_t maxVal;
uint8_t maxInd = 0;
int jmax = (1<<(len-1));
for (int j = 0; j < jmax; ++j)
for (int k = 0; k < NR_SMALL_BLOCK_CODED_BITS; ++k)
Rhat[j] += in[k] * hadamard32InterleavedTransposed[j][k];
#if defined(__AVX2__)
for (int i = 0; i < NR_SMALL_BLOCK_CODED_BITS; i += 16) {
__m256i a15_a0 = _mm256_loadu_si256((__m256i*)&Rhat[i]);
a15_a0 = _mm256_abs_epi16(a15_a0);
_mm256_storeu_si256((__m256i*)(&Rhatabs[i]), a15_a0);
}
#else
for (int i = 0; i < NR_SMALL_BLOCK_CODED_BITS; i += 8) {
__m128i a7_a0 = _mm_loadu_si128((__m128i*)&Rhat[i]);
a7_a0 = _mm_abs_epi16(a7_a0);
_mm_storeu_si128((__m128i*)(&Rhatabs[i]), a7_a0);
}
#endif
maxVal = Rhatabs[0];
for (int k = 1; k < jmax; ++k){
if (Rhatabs[k] > maxVal){
maxVal = Rhatabs[k];
maxInd = k;
}
}
out = properOrderedBasis[maxInd] | ( (Rhat[maxInd] > 0) ? (uint16_t)0 : (uint16_t)1 );
#ifdef DEBUG_DECODESMALLBLOCK
for (int k = 0; k < jmax; ++k)
printf("[decodeSmallBlock]Rhat[%d]=%d %d %d %d\n",k, Rhat[k], maxVal, maxInd, ((uint32_t)out>>k)&1);
printf("[decodeSmallBlock]0x%x 0x%x\n", out, properOrderedBasis[maxInd]);
#endif
} else {
uint8_t maxRow = 0, maxCol = 0;
#if defined(__AVX2__)
int16_t maxVal = 0;
int DmatrixElementVal = 0;
int8_t DmatrixElement[NR_SMALL_BLOCK_CODED_BITS] = {0};
__m256i _in_256 = _mm256_loadu_si256 ((__m256i*)&in[0]);
__m256i _maskD_256, _Dmatrixj_256, _maskH_256, _DmatrixElement_256;
for (int j = 0; j < ( 1<<(len-6) ); ++j) {
_maskD_256 = _mm256_loadu_si256 ((__m256i*)(&maskD[j][0]));
_Dmatrixj_256 = _mm256_sign_epi8 (_in_256, _maskD_256);
for (int k = 0; k < NR_SMALL_BLOCK_CODED_BITS; ++k) {
_maskH_256 = _mm256_loadu_si256 ((__m256i*)(&hadamard32InterleavedTransposed[k][0]));
_DmatrixElement_256 = _mm256_sign_epi8 (_Dmatrixj_256, _maskH_256);
#if defined(__AVX512F__)
DmatrixElementVal = _mm512_reduce_add_epi32 (
_mm512_add_epi32(
_mm512_cvtepi8_epi32 (_mm256_extracti128_si256 (_DmatrixElement_256, 1)),
_mm512_cvtepi8_epi32 (_mm256_castsi256_si128 (_DmatrixElement_256))
)
);
#else
_mm256_storeu_si256((__m256i*)(&DmatrixElement[0]), _DmatrixElement_256);
for (int i = 0; i < NR_SMALL_BLOCK_CODED_BITS; ++i)
DmatrixElementVal += DmatrixElement[i];
#endif
if (abs(DmatrixElementVal) > abs(maxVal)){
maxVal = DmatrixElementVal;
maxRow = j;
maxCol = k;
}
DmatrixElementVal=0;
}
}
out = properOrderedBasisExtended[maxRow] | properOrderedBasis[maxCol] | ( (maxVal > 0) ? (uint16_t)0 : (uint16_t)1 );
#else
int8_t Dmatrix[NR_SMALL_BLOCK_CODED_BITS][NR_SMALL_BLOCK_CODED_BITS] = {0};
int16_t DmatrixFHT[NR_SMALL_BLOCK_CODED_BITS][NR_SMALL_BLOCK_CODED_BITS] = {0};
uint16_t maxVal;
uint8_t rowLimit = 1<<(len-6);
for (int j = 0; j < ( rowLimit ); ++j)
for (int k = 0; k < NR_SMALL_BLOCK_CODED_BITS; ++k)
Dmatrix[j][k] = in[k] * maskD[j][k];
for (int i = 0; i < ( rowLimit ); ++i)
for (int j = 0; j < NR_SMALL_BLOCK_CODED_BITS; ++j)
for (int k = 0; k < NR_SMALL_BLOCK_CODED_BITS; ++k)
DmatrixFHT[i][j] += Dmatrix[i][k] * hadamard32InterleavedTransposed[j][k];
maxVal = abs(DmatrixFHT[0][0]);
for (int i = 0; i < ( rowLimit ); ++i)
for (int j = 0; j < NR_SMALL_BLOCK_CODED_BITS; ++j)
if (abs(DmatrixFHT[i][j]) > maxVal){
maxVal = abs(DmatrixFHT[i][j]);
maxRow = i;
maxCol = j;
}
out = properOrderedBasisExtended[maxRow] | properOrderedBasis[maxCol] | ( (DmatrixFHT[maxRow][maxCol] > 0) ? (uint16_t)0 : (uint16_t)1 );
#endif
#ifdef DEBUG_DECODESMALLBLOCK
for (int k = 0; k < NR_SMALL_BLOCK_CODED_BITS; ++k)
printf("[decodeSmallBlock]maxRow = %d maxCol = %d out[%d]=%d\n", maxRow, maxCol, k, ((uint32_t)out>>k)&1);
#endif
}
return out;
}