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limit code length to 256

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Ahmet Inan 2026-02-02 07:54:51 +01:00
commit 520382a396
3 changed files with 7 additions and 15 deletions
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2
pac_encoder.hh
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@ -26,7 +26,7 @@ class PACEncoder
return output; return output;
} }
public: public:
void operator()(TYPE *codeword, const TYPE *message, const int *rank_map, int mesg_bits, int level) void operator()(TYPE *codeword, const TYPE *message, const uint8_t *rank_map, int mesg_bits, int level)
{ {
int length = 1 << level; int length = 1 << level;
int state = 0; int state = 0;

16
pac_list_decoder.hh
View file

@ -18,7 +18,7 @@ struct PACListTree
typedef typename PH::PATH PATH; typedef typename PH::PATH PATH;
typedef typename PH::MAP MAP; typedef typename PH::MAP MAP;
static const int N = 1 << M; static const int N = 1 << M;
static MAP decode(PATH *metric, TYPE *message, MAP *maps, int *count, int *state, TYPE *hard, TYPE *soft, const int *rank, int frozen) static MAP decode(PATH *metric, TYPE *message, MAP *maps, int *count, int *state, TYPE *hard, TYPE *soft, const uint8_t *rank, int frozen)
{ {
for (int i = 0; i < N/2; ++i) for (int i = 0; i < N/2; ++i)
soft[i+N/2] = PH::prod(soft[i+N], soft[i+N/2+N]); soft[i+N/2] = PH::prod(soft[i+N], soft[i+N/2+N]);
@ -97,7 +97,7 @@ struct PACListTree<TYPE, 1>
*hard = hrd; *hard = hrd;
return map; return map;
} }
static MAP decode(PATH *metric, TYPE *message, MAP *maps, int *count, int *state, TYPE *hard, TYPE *soft, const int *rank, int frozen) static MAP decode(PATH *metric, TYPE *message, MAP *maps, int *count, int *state, TYPE *hard, TYPE *soft, const uint8_t *rank, int frozen)
{ {
soft[1] = PH::prod(soft[2], soft[3]); soft[1] = PH::prod(soft[2], soft[3]);
MAP lmap, rmap; MAP lmap, rmap;
@ -118,7 +118,7 @@ struct PACListTree<TYPE, 1>
template <typename TYPE, int MAX_M> template <typename TYPE, int MAX_M>
class PACListDecoder class PACListDecoder
{ {
static_assert(MAX_M >= 5 && MAX_M <= 16); static_assert(MAX_M >= 5 && MAX_M <= 8);
typedef PolarHelper<TYPE> PH; typedef PolarHelper<TYPE> PH;
typedef typename TYPE::value_type VALUE; typedef typename TYPE::value_type VALUE;
typedef typename PH::PATH PATH; typedef typename PH::PATH PATH;
@ -128,7 +128,7 @@ class PACListDecoder
TYPE hard[MAX_N]; TYPE hard[MAX_N];
MAP maps[MAX_N]; MAP maps[MAX_N];
public: public:
void operator()(int *rank, TYPE *message, const VALUE *codeword, const int *rank_map, int mesg_bits, int level) void operator()(int *rank, TYPE *message, const VALUE *codeword, const uint8_t *rank_map, int mesg_bits, int level)
{ {
assert(level <= MAX_M); assert(level <= MAX_M);
PATH metric[TYPE::SIZE]; PATH metric[TYPE::SIZE];
@ -149,14 +149,6 @@ public:
case 6: PACListTree<TYPE, 6>::decode(metric, message, maps, &count, state, hard, soft, rank_map, frozen); break; case 6: PACListTree<TYPE, 6>::decode(metric, message, maps, &count, state, hard, soft, rank_map, frozen); break;
case 7: PACListTree<TYPE, 7>::decode(metric, message, maps, &count, state, hard, soft, rank_map, frozen); break; case 7: PACListTree<TYPE, 7>::decode(metric, message, maps, &count, state, hard, soft, rank_map, frozen); break;
case 8: PACListTree<TYPE, 8>::decode(metric, message, maps, &count, state, hard, soft, rank_map, frozen); break; case 8: PACListTree<TYPE, 8>::decode(metric, message, maps, &count, state, hard, soft, rank_map, frozen); break;
case 9: PACListTree<TYPE, 9>::decode(metric, message, maps, &count, state, hard, soft, rank_map, frozen); break;
case 10: PACListTree<TYPE, 10>::decode(metric, message, maps, &count, state, hard, soft, rank_map, frozen); break;
case 11: PACListTree<TYPE, 11>::decode(metric, message, maps, &count, state, hard, soft, rank_map, frozen); break;
case 12: PACListTree<TYPE, 12>::decode(metric, message, maps, &count, state, hard, soft, rank_map, frozen); break;
case 13: PACListTree<TYPE, 13>::decode(metric, message, maps, &count, state, hard, soft, rank_map, frozen); break;
case 14: PACListTree<TYPE, 14>::decode(metric, message, maps, &count, state, hard, soft, rank_map, frozen); break;
case 15: PACListTree<TYPE, 15>::decode(metric, message, maps, &count, state, hard, soft, rank_map, frozen); break;
case 16: PACListTree<TYPE, 16>::decode(metric, message, maps, &count, state, hard, soft, rank_map, frozen); break;
default: assert(false); default: assert(false);
} }

4
tests/pac_list_regression_test.cc
View file

@ -20,7 +20,7 @@ Copyright 2025 Ahmet Inan <inan@aicodix.de>
int main() int main()
{ {
const int MAX_M = 10; const int MAX_M = 8;
const int MAX_N = 1 << MAX_M; const int MAX_N = 1 << MAX_M;
const int M = 7; const int M = 7;
const int N = 1 << M; const int N = 1 << M;
@ -52,7 +52,7 @@ int main()
auto rel_seq = new int[MAX_N]; auto rel_seq = new int[MAX_N];
(*construct)(rel_seq, MAX_M); (*construct)(rel_seq, MAX_M);
delete construct; delete construct;
auto rank_map = new int[N]; auto rank_map = new uint8_t[N];
for (int i = 0, j = 0; i < MAX_N && j < N; ++i) { for (int i = 0, j = 0; i < MAX_N && j < N; ++i) {
int index = rel_seq[i]; int index = rel_seq[i];
if (index < N) if (index < N)