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create write disable mask for next visit on the fly

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This commit is contained in:
Ahmet Inan 2019-11-06 17:43:12 +01:00
commit 3b5a4088fc
1 changed files with 17 additions and 31 deletions
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48
ldpc_decoder.hh
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@ -79,7 +79,6 @@ class LDPCDecoder
{
TYPE *bl = bnl;
Loc *lo = loc;
wdm_t *wd = wdm;
auto bad = vmask(vzero<TYPE>());
for (int i = 0; i < PTY; ++i) {
int deg = cnt[i];
@ -88,8 +87,9 @@ class LDPCDecoder
TYPE min1 = vdup<TYPE>(127);
TYPE signs = vdup<TYPE>(127);
TYPE cnv = vdup<TYPE>(127);
bool write_conflict = false;
int last_offset = -1;
wdm_t first_wdb = 0;
wdm_t next_wdm = 0;
int last_offset = 0;
int8_t prev_val = 0;
for (int k = 0; k < deg; ++k) {
@ -102,8 +102,17 @@ class LDPCDecoder
tmp.v[0] = 127;
}
if (last_offset == offset)
write_conflict = true;
wdm_t this_wdb = (wdm[i]>>k)&1;
if (k) {
if (last_offset == offset) {
next_wdm |= this_wdb<<(k-1);
} else {
next_wdm |= first_wdb<<(k-1);
first_wdb = this_wdb;
}
} else {
first_wdb = this_wdb;
}
last_offset = offset;
TYPE inp = vqsub(tmp, bl[k]);
@ -143,33 +152,14 @@ class LDPCDecoder
if (offset == VAR-1 && shift == 1)
tmp.v[0] = prev_val;
if (!write_conflict || !((*wd>>k)&1)) {
if (!((wdm[i]>>k)&1)) {
bl[k] = out;
var[offset] = tmp;
csh[offset] = shift;
}
}
bad = vorr(bad, vclez(cnv));
if (write_conflict) {
for (int first = 0, k = 1; k < deg; ++k) {
if (lo[first].off != lo[k].off || k == deg-1) {
int last = k - 1;
if (k == deg-1)
++last;
if (last != first) {
int count = last - first + 1;
wdm_t mask = ((1 << count) - 1) << first;
wdm_t cur = *wd;
wdm_t tmp = cur & mask;
wdm_t ror = (tmp >> 1) | (tmp << (count-1));
*wd = (cur & ~mask) | (ror & mask);
}
first = k;
}
}
++wd;
}
wdm[i] = next_wdm;
lo += deg;
bl += deg;
}
@ -205,7 +195,6 @@ public:
for (int j = 0; j < W; ++j)
cnt[W*i+j] = cnc[i] + 2;
Loc *lo = loc;
wdm_t *wd = wdm;
for (int i = 0; i < q; ++i) {
int cnt = cnc[i];
int deg = cnt + 2;
@ -238,16 +227,13 @@ public:
for (int d = 0; d < deg-1; ++d)
if (lo[d].off == lo[d+1].off)
tmp |= 1 << d;
if (tmp)
*wd++ = tmp;
wdm[W*i+j] = tmp;
#if 0
std::cout << deg;
for (int d = 0; d < deg; ++d)
std::cout << '\t' << (int)lo[d].off << ':' << (int)lo[d].shi;
std::cout << std::endl;
#endif
lo += deg;
}
}