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reg3:: subrule:: remove non-branching NLES

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Zeno Rogue 2022-07-13 20:58:42 +02:00
parent 0e14d06e40
commit 58c78220df
1 changed files with 41 additions and 1 deletions
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42
reg3.cpp
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@ -1904,6 +1904,8 @@ EX namespace reg3 {
}
}
/* find all back paths */
auto &nles = nonlooping_earlier_states;
nles.clear();
vector<address> bfs;
@ -1933,6 +1935,8 @@ EX namespace reg3 {
for(auto p: q) q2[p]++;
DEBB(DF_GEOM, ("q2 = ", q2));
/* remove BFS roots, and addresses that lead only there */
bfs = {};
for(int i=0; i<isize(root); i++)
bfs.emplace_back(i, root[i]);
@ -1957,7 +1961,43 @@ EX namespace reg3 {
}
DEBB(DF_GEOM, ("removed cases = ", isize(bfs)));
/* remove non-branching states */
set<address> good;
bfs = {};
auto visit = [&] (address a) { if(good.count(a)) return; good.insert(a); bfs.push_back(a); };
for(auto& a: nonlooping_earlier_states) if(isize(a.second) > 1) visit(a.first);
for(int i=0; i<isize(bfs); i++) {
address last = bfs[i];
int state = last.second;
int fv = last.first;
for(int d=0; d<childpos[state+1]-childpos[state]; d++) {
int nstate = children[childpos[state]+d];
if(nstate < -1) nstate += (1<<16);
if(nstate >= 0) {
address next = {connection(fv, d), nstate};
if(!nles.count(next)) continue;
visit(next);
}
}
}
set<address> bad;
for(auto& a: nonlooping_earlier_states) if(!good.count(a.first)) bad.insert(a.first);
for(auto& b: bad) nonlooping_earlier_states.erase(b);
int to_cut = 0;
for(auto& a: nonlooping_earlier_states) {
set<address> goods;
for(auto& b: a.second) if(good.count(b)) goods.insert(b); else to_cut++;
a.second = goods;
}
println(hlog, "to_cut = ", to_cut, " from ", isize(bad), " bad cases");
// just the number of FV's
int pstable = 0;
for(auto& p: nonlooping_earlier_states)