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use a write disable mask instead of array

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This commit is contained in:
Ahmet Inan 2019-09-30 14:20:39 +02:00
commit 3688d55b0a
1 changed files with 13 additions and 17 deletions
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30
ldpc_decoder2.hh
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@ -44,6 +44,8 @@ class LDPCDecoder
typedef SIMD<int8_t, SIMD_SIZE> TYPE;
typedef struct { uint16_t off; uint16_t shi; } Loc;
typedef uint32_t wd_t;
static_assert(sizeof(wd_t) * 8 >= TABLE::LINKS_MAX_CN, "write disable mask needs at least as many bits as max check node links");
Rotate<TYPE, D> rotate;
TYPE bnl[BNL];
@ -142,13 +144,11 @@ class LDPCDecoder
int cnt = cnc[i];
int deg = cnt + 2;
for (int j = 0; j < W; ++j) {
bool wd[deg], repeat = false;
for (int d = 0; d < deg; ++d)
wd[d] = false;
wd_t wd = 0;
for (int c = 1; c < cnt; ++c)
if (lo[c].off == lo[c-1].off)
wd[c] = repeat = true;
do {
wd |= 1 << c;
while (1) {
TYPE par[2];
if (i) {
par[0] = pty[W*(i-1)+j];
@ -185,28 +185,24 @@ class LDPCDecoder
pty[PTY-1] = rotate(par[0], -1);
}
pty[W*i+j] = par[1];
if (repeat) {
if (wd) {
for (int c = 0; c < cnt; ++c)
if (!wd[c])
if (!((wd>>c)&1))
msg[lo[c].off] = rotate(mes[c], lo[c].shi);
for (int d = 0; d < deg; ++d)
if (!wd[d])
if (!((wd>>d)&1))
bl[d] = out[d];
repeat = false;
for (int c = 1; c < cnt; ++c) {
if (wd[c] && !wd[c-1]) {
wd[c] = false;
repeat = true;
++c;
}
}
for (int c = 1; c < cnt; ++c)
if (((wd>>c)&1) && !((wd>>(c-1))&1))
wd ^= 1 << c++;
} else {
for (int c = 0; c < cnt; ++c)
msg[lo[c].off] = rotate(mes[c], lo[c].shi);
for (int d = 0; d < deg; ++d)
bl[d] = out[d];
break;
}
} while (repeat);
}
lo += cnt;
bl += deg;
}