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Updated packed LDPC output format to be compliant with 38.321

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This commit is contained in:
sebastian
2019-10-10 10:20:06 +02:00
parent 2daf95a027
commit 2cd4d9f670
1 changed files with 19 additions and 6 deletions
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openair1/PHY/CODING/nrLDPC_decoder/nrLDPC_bnProc.h
+19 -6
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@@ -47,7 +47,7 @@ static inline void nrLDPC_bnProcPc(t_nrLDPC_lut* p_lut, t_nrLDPC_procBuf* p_proc
int8_t* bnProcBufRes = p_procBuf->bnProcBufRes; int8_t* bnProcBufRes = p_procBuf->bnProcBufRes;
int8_t* llrRes = p_procBuf->llrRes; int8_t* llrRes = p_procBuf->llrRes;
int8_t* llrProcBuf = p_procBuf->llrProcBuf; int8_t* llrProcBuf = p_procBuf->llrProcBuf;
__m128i* p_bnProcBuf; __m128i* p_bnProcBuf;
__m256i* p_bnProcBufRes; __m256i* p_bnProcBufRes;
__m128i* p_llrProcBuf; __m128i* p_llrProcBuf;
@@ -1693,7 +1693,7 @@ static inline void nrLDPC_bnProc(t_nrLDPC_lut* p_lut, t_nrLDPC_procBuf* p_procBu
int8_t* bnProcBuf = p_procBuf->bnProcBuf; int8_t* bnProcBuf = p_procBuf->bnProcBuf;
int8_t* bnProcBufRes = p_procBuf->bnProcBufRes; int8_t* bnProcBufRes = p_procBuf->bnProcBufRes;
int8_t* llrRes = p_procBuf->llrRes; int8_t* llrRes = p_procBuf->llrRes;
__m256i* p_bnProcBuf; __m256i* p_bnProcBuf;
__m256i* p_bnProcBufRes; __m256i* p_bnProcBufRes;
__m256i* p_llrRes; __m256i* p_llrRes;
@@ -2775,24 +2775,37 @@ static inline void nrLDPC_llr2bit(int8_t* out, int8_t* llrOut, uint16_t numLLR)
} }
/** /**
\brief Performs hard-decision on output LLRs and packs the output in 32 bit values. \brief Performs hard-decision on output LLRs and packs the output in byte aligned output according to TS 38.321 Section 6.1.1.
i = 0,1,2,...
IN[i] : a0, a1, a2, ..., a_{A-1}
OUT[i]: a7,a6,a5,a4,a3,a2,a1,a0|a15,14,...,a8|a23,a22,...,a16|a31,a30,...,a24|...
\param out Pointer hard-decision output, every int8_t contains 8 bits \param out Pointer hard-decision output, every int8_t contains 8 bits
\param llrOut Pointer to output LLRs \param llrOut Pointer to output LLRs
\param numLLR Number of LLRs \param numLLR Number of LLRs
*/ */
static inline void nrLDPC_llr2bitPacked(int8_t* out, int8_t* llrOut, uint16_t numLLR) static inline void nrLDPC_llr2bitPacked(int8_t* out, int8_t* llrOut, uint16_t numLLR)
{ {
/** Vector for moving LSB 1 to MSB 1 */
const uint8_t const127_256_epu8[32] __attribute__ ((aligned(32))) = {127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127,127};
/** Vector of indices for shuffling input */
const uint8_t constShuffle_256_epi8[32] __attribute__ ((aligned(32))) = {7,6,5,4,3,2,1,0,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,15,14,13,12,11,10,9,8};
__m256i* p_llrOut = (__m256i*) llrOut; __m256i* p_llrOut = (__m256i*) llrOut;
uint32_t* p_bits = (uint32_t*) out; uint32_t* p_bits = (uint32_t*) out;
__m256i inPerm;
int8_t* p_llrOut8; int8_t* p_llrOut8;
uint32_t bitsTmp = 0; uint32_t bitsTmp = 0;
uint32_t i; uint32_t i;
uint32_t M = numLLR>>5; uint32_t M = numLLR>>5;
uint32_t Mr = numLLR&31; uint32_t Mr = numLLR&31;
const __m256i* p_127 = (__m256i*) const127_256_epu8;
const __m256i* p_shuffle = (__m256i*) constShuffle_256_epi8;
for (i=0; i<M; i++) for (i=0; i<M; i++)
{ {
*p_bits++ = _mm256_movemask_epi8(*p_llrOut); inPerm = _mm256_shuffle_epi8(*p_llrOut,*p_shuffle);
*p_bits++ = _mm256_movemask_epi8(_mm256_adds_epu8(inPerm, *p_127));
p_llrOut++; p_llrOut++;
} }
@@ -2805,11 +2818,11 @@ static inline void nrLDPC_llr2bitPacked(int8_t* out, int8_t* llrOut, uint16_t nu
{ {
if (p_llrOut8[i] < 0) if (p_llrOut8[i] < 0)
{ {
bitsTmp |= (1<<i); bitsTmp |= (1<<((7-i) + (16*(i/8))));
} }
else else
{ {
bitsTmp &= (0<<i); bitsTmp |= (0<<((7-i) + (16*(i/8))));
} }
} }
} }