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Commit 344ac0f9 authored by Alexandre Duret-Lutz's avatar Alexandre Duret-Lutz
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sccinfo: do not accumulate successors during merge 

The command in #96 now takes 1min 16s.

* src/twaalgos/sccinfo.cc: Only gather successor SCCs when popping an
SCC.
* wrap/python/tests/automata.ipynb: Adjust.
parent b13b591f
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src/twaalgos/sccinfo.cc
View file @ 344ac0f9
...@@ -25,6 +25,7 @@ ...@@ -25,6 +25,7 @@
#include "twaalgos/mask.hh" #include "twaalgos/mask.hh"
#include "misc/escape.hh" #include "misc/escape.hh"
namespace spot namespace spot
{ {
...@@ -51,9 +52,8 @@ namespace spot ...@@ -51,9 +52,8 @@ namespace spot
unsigned n = aut->num_states(); unsigned n = aut->num_states();
sccof_.resize(n, -1U); sccof_.resize(n, -1U);
typedef std::list<scc> stack_type;
std::deque<unsigned> live; std::deque<unsigned> live;
stack_type root_; // Stack of SCC roots. std::deque<scc> root_; // Stack of SCC roots.
std::vector<int> h_(n, 0); std::vector<int> h_(n, 0);
// Map of visited states. Values > 0 designate maximal SCC. // Map of visited states. Values > 0 designate maximal SCC.
// Values < 0 number states that are part of incomplete SCCs being // Values < 0 number states that are part of incomplete SCCs being
...@@ -79,7 +79,7 @@ namespace spot ...@@ -79,7 +79,7 @@ namespace spot
unsigned init = aut->get_init_state_number(); unsigned init = aut->get_init_state_number();
num_ = -1; num_ = -1;
h_[init] = num_; h_[init] = num_;
root_.emplace_front(num_, bddfalse, 0U); root_.emplace_back(num_, bddfalse, 0U);
todo_.emplace(init, aut->out(init).begin()); todo_.emplace(init, aut->out(init).begin());
live.emplace_back(init); live.emplace_back(init);
} }
...@@ -102,12 +102,12 @@ namespace spot ...@@ -102,12 +102,12 @@ namespace spot
// remove that SCC from the ARC/ROOT stacks. We must // remove that SCC from the ARC/ROOT stacks. We must
// discard from H all reachable states from this SCC. // discard from H all reachable states from this SCC.
assert(!root_.empty()); assert(!root_.empty());
if (root_.front().index == h_[curr]) if (root_.back().index == h_[curr])
{ {
int num = node_.size(); unsigned num = node_.size();
bdd cond = root_.front().in_cond; bdd cond = root_.back().in_cond;
auto acc = root_.front().node.acc_marks(); auto acc = root_.back().node.acc_marks();
bool triv = root_.front().node.is_trivial(); bool triv = root_.back().node.is_trivial();
node_.emplace_back(acc, triv); node_.emplace_back(acc, triv);
// Move all elements of this SCC from the live stack // Move all elements of this SCC from the live stack
...@@ -119,22 +119,30 @@ namespace spot ...@@ -119,22 +119,30 @@ namespace spot
nbs.insert(nbs.end(), i.base(), live.end()); nbs.insert(nbs.end(), i.base(), live.end());
live.erase(i.base(), live.end()); live.erase(i.base(), live.end());
std::set<unsigned> dests;
unsigned np1 = num + 1;
for (unsigned s: nbs) for (unsigned s: nbs)
{ {
sccof_[s] = num; sccof_[s] = num;
h_[s] = num + 1; h_[s] = np1;
} }
// Gather all successor SCCs
std::swap(node_.back().succ_, root_.front().node.succ_); for (unsigned s: nbs)
for (auto& t: aut->out(s))
{
unsigned n = sccof_[t.dst];
assert(n != -1U);
if (n == num)
continue;
dests.insert(n);
}
auto& succ = node_.back().succ_;
succ.insert(succ.end(), dests.begin(), dests.end());
node_.back().accepting_ = node_.back().accepting_ =
!triv && root_.front().node.accepting_; !triv && root_.back().node.accepting_;
node_.back().rejecting_ = node_.back().rejecting_ =
triv || !aut->acc().inf_satisfiable(acc); triv || !aut->acc().inf_satisfiable(acc);
root_.pop_front(); root_.pop_back();
// Record the transition between the SCC being popped
// and the previous SCC.
if (!root_.empty())
root_.front().node.succ_.emplace_back(num);
} }
continue; continue;
} }
...@@ -155,7 +163,7 @@ namespace spot ...@@ -155,7 +163,7 @@ namespace spot
// Yes. Number it, stack it, and register its successors // Yes. Number it, stack it, and register its successors
// for later processing. // for later processing.
h_[dest] = --num_; h_[dest] = --num_;
root_.emplace_front(num_, cond, acc); root_.emplace_back(num_, cond, acc);
todo_.emplace(dest, aut->out(dest).begin()); todo_.emplace(dest, aut->out(dest).begin());
live.emplace_back(dest); live.emplace_back(dest);
continue; continue;
...@@ -165,17 +173,7 @@ namespace spot ...@@ -165,17 +173,7 @@ namespace spot
// Have we reached a maximal SCC? // Have we reached a maximal SCC?
if (spi > 0) if (spi > 0)
{ continue;
--spi;
// Record that there is a transition from this SCC to the
// dest SCC labelled with cond.
auto& succ = root_.front().node.succ_;
scc_succs::iterator i =
std::find(succ.begin(), succ.end(), (unsigned) spi);
if (i == succ.end())
succ.emplace_back(spi);
continue;
}
// Now this is the most interesting case. We have reached a // Now this is the most interesting case. We have reached a
// state S1 which is already part of a non-dead SCC. Any such // state S1 which is already part of a non-dead SCC. Any such
...@@ -196,32 +194,27 @@ namespace spot ...@@ -196,32 +194,27 @@ namespace spot
is_accepting = aut->acc().accepting(acc); is_accepting = aut->acc().accepting(acc);
assert(!root_.empty()); assert(!root_.empty());
while (threshold > root_.front().index) while (threshold > root_.back().index)
{ {
acc |= root_.front().node.acc_; acc |= root_.back().node.acc_;
acc |= root_.front().in_acc; acc |= root_.back().in_acc;
is_accepting |= root_.front().node.accepting_; is_accepting |= root_.back().node.accepting_;
succs.insert(succs.end(), root_.pop_back();
root_.front().node.succ_.begin(),
root_.front().node.succ_.end());
root_.pop_front();
assert(!root_.empty()); assert(!root_.empty());
} }
// Note that we do not always have // Note that we do not always have
// threshold == root_.front().index // threshold == root_.back().index
// after this loop, the SCC whose index is threshold might have // after this loop, the SCC whose index is threshold might have
// been merged with a higher SCC. // been merged with a higher SCC.
// Accumulate all acceptance conditions, states, SCC // Accumulate all acceptance conditions, states, SCC
// successors, and conditions into the merged SCC. // successors, and conditions into the merged SCC.
root_.front().node.acc_ |= acc; root_.back().node.acc_ |= acc;
root_.front().node.accepting_ |= is_accepting root_.back().node.accepting_ |= is_accepting
|| aut->acc().accepting(root_.front().node.acc_); || aut->acc().accepting(root_.back().node.acc_);
root_.front().node.succ_.insert(root_.front().node.succ_.end(),
succs.begin(), succs.end());
// This SCC is no longer trivial. // This SCC is no longer trivial.
root_.front().node.trivial_ = false; root_.back().node.trivial_ = false;
} }
determine_usefulness(); determine_usefulness();
......
wrap/python/tests/automata.ipynb
View file @ 344ac0f9
...@@ -176,7 +176,7 @@ ...@@ -176,7 +176,7 @@
"</svg>\n" "</svg>\n"
], ],
"text": [ "text": [
"<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f44bdf3f8d0> >" "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe49c07cf30> >"
] ]
} }
], ],
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"<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"312\" y=\"-196.8\">!c &amp; d</text>\n", "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"215.5\" y=\"-236.8\">!d</text>\n",
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"</g>\n", "</g>\n",
"<!-- 2&#45;&gt;1 -->\n", "<!-- 2&#45;&gt;1 -->\n",
"<g class=\"edge\" id=\"edge8\"><title>2-&gt;1</title>\n", "<g class=\"edge\" id=\"edge8\"><title>2-&gt;1</title>\n",
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"</g>\n", "</g>\n",
"<!-- 2&#45;&gt;2 -->\n", "<!-- 2&#45;&gt;2 -->\n",
"<g class=\"edge\" id=\"edge9\"><title>2-&gt;2</title>\n", "<g class=\"edge\" id=\"edge9\"><title>2-&gt;2</title>\n",
...@@ -458,6 +440,24 @@ ...@@ -458,6 +440,24 @@
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"<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"379.5\" y=\"-232.8\">!c</text>\n", "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"379.5\" y=\"-232.8\">!c</text>\n",
"</g>\n", "</g>\n",
"<!-- 3&#45;&gt;1 -->\n",
"<g class=\"edge\" id=\"edge10\"><title>3-&gt;1</title>\n",
"<path d=\"M258.25,-249.586C243.436,-253.647 221.422,-257.015 205,-248 192.725,-241.262 184.14,-228.191 178.545,-216.482\" fill=\"none\" stroke=\"black\"/>\n",
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"<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"205\" y=\"-256.8\">c &amp; d</text>\n",
"</g>\n",
"<!-- 3&#45;&gt;2 -->\n",
"<g class=\"edge\" id=\"edge11\"><title>3-&gt;2</title>\n",
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"<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"312\" y=\"-229.8\">!c &amp; d</text>\n",
"</g>\n",
"<!-- 3&#45;&gt;3 -->\n",
"<g class=\"edge\" id=\"edge12\"><title>3-&gt;3</title>\n",
"<path d=\"M266.521,-259.916C264.179,-270.15 267.172,-280 275.5,-280 281.876,-280 285.125,-274.226 285.246,-266.927\" fill=\"none\" stroke=\"black\"/>\n",
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"</g>\n",
"<!-- 4&#45;&gt;4 -->\n", "<!-- 4&#45;&gt;4 -->\n",
"<g class=\"edge\" id=\"edge13\"><title>4-&gt;4</title>\n", "<g class=\"edge\" id=\"edge13\"><title>4-&gt;4</title>\n",
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...@@ -568,7 +568,7 @@ ...@@ -568,7 +568,7 @@
"</svg>\n" "</svg>\n"
], ],
"text": [ "text": [
"<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f44bdff74b0> >" "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe49c065360> >"
] ]
} }
], ],
...@@ -638,7 +638,7 @@ ...@@ -638,7 +638,7 @@
"</svg>\n" "</svg>\n"
], ],
"text": [ "text": [
"<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f44bdff7510> >" "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe49c0654b0> >"
] ]
} }
], ],
...@@ -714,7 +714,7 @@ ...@@ -714,7 +714,7 @@
"</svg>\n" "</svg>\n"
], ],
"text": [ "text": [
"<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f44bdff73c0> >" "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe49c065270> >"
] ]
} }
], ],
...@@ -1174,7 +1174,7 @@ ...@@ -1174,7 +1174,7 @@
"</svg>\n" "</svg>\n"
], ],
"text": [ "text": [
"<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f44bdff7420> >" "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe49c0652d0> >"
] ]
} }
], ],
...@@ -1275,7 +1275,7 @@ ...@@ -1275,7 +1275,7 @@
"</svg>\n" "</svg>\n"
], ],
"text": [ "text": [
"<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f44bdff72d0> >" "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe49c065150> >"
] ]
} }
], ],
...@@ -1393,7 +1393,7 @@ ...@@ -1393,7 +1393,7 @@
"</svg>\n" "</svg>\n"
], ],
"text": [ "text": [
"<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f44bdff7360> >" "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe49c0651e0> >"
] ]
} }
], ],
...@@ -1493,7 +1493,7 @@ ...@@ -1493,7 +1493,7 @@
"</svg>\n" "</svg>\n"
], ],
"text": [ "text": [
"<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f44bdff7450> >" "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe49c065300> >"
] ]
} }
], ],
...@@ -1967,7 +1967,7 @@ ...@@ -1967,7 +1967,7 @@
"</svg>\n" "</svg>\n"
], ],
"text": [ "text": [
"<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f44bdfd9ba0> >" "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe49c04ad80> >"
] ]
} }
], ],
...@@ -2170,7 +2170,7 @@ ...@@ -2170,7 +2170,7 @@
"</svg>\n" "</svg>\n"
], ],
"text": [ "text": [
"<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f44c5f30cc0> >" "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe49f10ec90> >"
] ]
} }
], ],
......
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