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add "legacy" support for theory case splits

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this replicates what was done in theory_str to add axioms excluding each
pair of literals from being assigned True at the same time;
no new heuristics are being used in smt_context (yet)
This commit is contained in:
Murphy Berzish 2016-12-16 15:50:03 -05:00
parent dd8cd8199b
commit e85f9d33c4
4 changed files with 49 additions and 8 deletions
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21
src/smt/smt_context.cpp
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@ -2939,6 +2939,27 @@ namespace smt {
assert_expr_core(e, pr);
}
void context::mk_th_case_split(unsigned num_lits, literal * lits) {
TRACE("theory_case_split", display_literals_verbose(tout << "theory case split: ", num_lits, lits); tout << std::endl;);
// If we don't use the theory case split heuristic,
// for each pair of literals (l1, l2) we add the clause (~l1 OR ~l2)
// to enforce the condition that more than one literal can't be
// assigned 'true' simultaneously.
if (!m_fparams.m_theory_case_split) {
for (unsigned i = 0; i < num_lits; ++i) {
for (unsigned j = i+1; j < num_lits; ++j) {
literal l1 = lits[i];
literal l2 = lits[j];
literal excl[2] = {~l1, ~l2};
justification * j_excl = 0;
mk_clause(2, excl, j_excl);
}
}
} else {
NOT_IMPLEMENTED_YET();
}
}
bool context::reduce_assertions() {
if (!m_asserted_formulas.inconsistent()) {
SASSERT(at_base_level());