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fixes

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-06-09 10:18:18 -07:00 • committed by Arie Gurfinkel
parent 688cf79619
commit 0784074b67
3 changed files with 9 additions and 2 deletions
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7
src/qe/qe_mbi.cpp
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@ -104,6 +104,7 @@ namespace qe {
/** --------------------------------------------------------------
* ping-pong interpolation of Gurfinkel & Vizel
* compute a binary interpolant.
* TBD: also implement the one-sided versions that create clausal interpolants.
*/
lbool interpolator::binary(mbi_plugin& a, mbi_plugin& b, func_decl_ref_vector const& vars, expr_ref& itp) {
ast_manager& m = vars.get_manager();
@ -126,14 +127,18 @@ namespace qe {
itp = nullptr;
return l_true;
}
TRACE("mbi", tout << "new lits " << lits << "\n";);
break; // continue
case mbi_unsat: {
if (lits.empty()) {
itp = mk_and(itps[turn]);
// TBD, either a => itp and itp => !b
// or b => itp and itp => !a
itp = mk_and(itps[!turn]);
return l_false;
}
t2->block(lits);
expr_ref lemma(mk_not(mk_and(lits)));
TRACE("mbi", tout << lemma << "\n";);
blocks[turn].push_back(lemma);
itp = m.mk_implies(mk_and(blocks[!turn]), lemma);
// TBD: compute closure over variables not in vars