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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-07-02 02:48:45 -07:00
parent 05bcf0bed7
commit 788de7d614
9 changed files with 174 additions and 45 deletions
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31
src/math/dd/dd_fdd.cpp
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@ -301,5 +301,36 @@ namespace dd {
return true;
}
bool_vector fdd::rational2bits(rational const& r) const {
bool_vector result;
for (unsigned i = 0; i < num_bits(); ++i)
result.push_back(r.get_bit(i));
return result;
}
rational fdd::bits2rational(bool_vector const& v) const {
rational result(0);
for (unsigned i = 0; i < num_bits(); ++i)
if (v[i])
result += rational::power_of_two(i);
return result;
}
bool fdd::sup(bdd const& b, rational& _lo) const {
bool_vector lo = rational2bits(_lo);
if (!sup(b, lo))
return false;
_lo = bits2rational(lo);
return true;
}
bool fdd::inf(bdd const& b, rational& _hi) const {
bool_vector hi = rational2bits(_hi);
if (!inf(b, hi))
return false;
_hi = bits2rational(hi);
return true;
}
}

8
src/math/dd/dd_fdd.h
View file

@ -47,6 +47,10 @@ namespace dd {
bool contains(bdd const& b, bool_vector const& value) const;
rational bits2rational(bool_vector const& v) const;
bool_vector rational2bits(rational const& r) const;
public:
/** Initialize FDD using BDD variables from 0 to num_bits-1. */
fdd(bdd_manager& manager, unsigned num_bits, unsigned start = 0, unsigned step = 1) : fdd(manager, seq(num_bits, start, step)) { }
@ -89,6 +93,10 @@ namespace dd {
bool sup(bdd const& b, bool_vector& lo) const;
bool inf(bdd const& b, bool_vector& hi) const;
bool sup(bdd const& b, rational& lo) const;
bool inf(bdd const& b, rational& hi) const;
};