diff options
Diffstat (limited to 'src/theory/bv/bitblast_strategies.cpp')
| -rw-r--r-- | src/theory/bv/bitblast_strategies.cpp | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/theory/bv/bitblast_strategies.cpp b/src/theory/bv/bitblast_strategies.cpp index fbf9a45ee..c25c40c22 100644 --- a/src/theory/bv/bitblast_strategies.cpp +++ b/src/theory/bv/bitblast_strategies.cpp @@ -648,6 +648,17 @@ void DefaultUdivBB (TNode node, Bits& q, Bitblaster* bb) { Bits r; uDivModRec(a, b, q, r, getSize(node)); + // adding a special case for division by 0 + std::vector<Node> iszero; + for (unsigned i = 0; i < b.size(); ++i) { + iszero.push_back(utils::mkNode(kind::IFF, b[i], utils::mkFalse())); + } + Node b_is_0 = utils::mkAnd(iszero); + + for (unsigned i = 0; i < q.size(); ++i) { + q[i] = utils::mkNode(kind::ITE, b_is_0, utils::mkFalse(), q[i]); + r[i] = utils::mkNode(kind::ITE, b_is_0, utils::mkFalse(), r[i]); + } // cache the remainder in case we need it later Node remainder = mkNode(kind::BITVECTOR_UREM_TOTAL, node[0], node[1]); @@ -664,6 +675,17 @@ void DefaultUremBB (TNode node, Bits& rem, Bitblaster* bb) { Bits q; uDivModRec(a, b, q, rem, getSize(node)); + // adding a special case for division by 0 + std::vector<Node> iszero; + for (unsigned i = 0; i < b.size(); ++i) { + iszero.push_back(utils::mkNode(kind::IFF, b[i], utils::mkFalse())); + } + Node b_is_0 = utils::mkAnd(iszero); + + for (unsigned i = 0; i < q.size(); ++i) { + q[i] = utils::mkNode(kind::ITE, b_is_0, utils::mkFalse(), q[i]); + rem[i] = utils::mkNode(kind::ITE, b_is_0, utils::mkFalse(), rem[i]); + } // cache the quotient in case we need it later Node quotient = mkNode(kind::BITVECTOR_UDIV_TOTAL, node[0], node[1]); |