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feat(nrLDPC_coding_t2): Shift encoder output with 64 bits shift

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Use 64 bits shift to shift the output segment of the encoding operations to their offset in the coding library output buffer.
This commit is contained in:
Romain Beurdouche
2025-05-13 14:08:33 +00:00
parent 2feb36407c
commit 360f341394
1 changed files with 20 additions and 12 deletions
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openair1/PHY/CODING/nrLDPC_coding/nrLDPC_coding_t2/nrLDPC_coding_t2.c
+20 -12
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@@ -657,33 +657,41 @@ retrieve_ldpc_enc_op(struct rte_bbdev_enc_op **ops,
int bit_offset = 0;
int byte_offset = 0;
p_out = nrLDPC_slot_encoding_parameters->TBs[h].output;
for (unsigned int i = 0; i < nrLDPC_slot_encoding_parameters->TBs[h].C; ++i) {
for (unsigned int r = 0; r < nrLDPC_slot_encoding_parameters->TBs[h].C; ++r) {
struct rte_bbdev_op_data *output = &ops[j]->ldpc_enc.output;
struct rte_mbuf *m = output->data;
uint16_t data_len = rte_pktmbuf_data_len(m) - output->offset;
const char *data = m->buf_addr + m->data_off;
uint8_t *data = m->buf_addr + m->data_off;
reverse_bits_u8(data, data_len, data);
if (bit_offset == 0) {
memcpy(&p_out[byte_offset], data, data_len);
} else {
uint8_t carry = 0;
p_out[byte_offset - 1] |= data[0] >> bit_offset;
for (size_t i = 0; i < data_len; i++) {
size_t i = 0;
for (; i < (data_len & ~0x7); i += 8) {
uint8_t carry = *data << bit_offset;
p_out[byte_offset + i - 1] |= carry;
simde__m64 current = *((simde__m64 *)data);
data += 8;
current = simde_mm_srli_si64(current, 8 - bit_offset);
*(simde__m64 *)&p_out[byte_offset + i] = current;
}
for (; i < data_len; i++) {
uint8_t current = *data++;
p_out[byte_offset + i] = (current << (8 - bit_offset));
if (i != 0) {
carry = current >> bit_offset;
p_out[byte_offset + i - 1] |= carry;
}
uint8_t carry = current << bit_offset;
p_out[byte_offset + i - 1] |= carry;
p_out[byte_offset + i] = (current >> (8 - bit_offset));
}
}
E_sum += nrLDPC_slot_encoding_parameters->TBs[h].segments[i].E;
E_sum += nrLDPC_slot_encoding_parameters->TBs[h].segments[r].E;
byte_offset = (E_sum + 7) / 8;
bit_offset = E_sum % 8;
rte_pktmbuf_free(m);
rte_pktmbuf_free(ops[j]->ldpc_enc.input.data);
++j;
}
reverse_bits_u8(p_out, byte_offset, p_out);
}
return 0;
}