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prepare for tuned viable sets

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-06-30 01:05:34 -04:00
parent a0b0c1f428
commit a374e739f1
6 changed files with 165 additions and 38 deletions
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32
src/math/dd/dd_fdd.cpp
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@ -120,4 +120,36 @@ namespace dd {
return out;
}
bool fdd::sup(bdd const& x, bool_vector& lo) {
SASSERT(lo.size() == num_bits());
//
// Assumption: common case is that high-order bits are before lower-order bits also
// after re-ordering.
//
// this checks that lo is included in x
bdd b = x;
while (!b.is_true()) {
unsigned const pos = var2pos(b.var());
SASSERT(pos != UINT_MAX && "Unexpected BDD variable");
if (lo[pos] && b.hi().is_false())
return false;
if (!lo[pos] && b.lo().is_false())
return false;
if (lo[pos])
b = b.hi();
else
b = b.lo();
}
return false;
}
bool fdd::inf(bdd const& b, bool_vector& hi) {
SASSERT(hi.size() == num_bits());
return false;
}
}