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fix bug in blocked clause elimination: it was ignoring unit literals

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-03-31 13:26:20 -07:00
parent aa2721517b
commit 55eb11d91b
5 changed files with 33 additions and 37 deletions
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15
src/tactic/bv/bit_blaster_model_converter.cpp
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@ -52,7 +52,7 @@ struct bit_blaster_model_converter : public model_converter {
m_newbits.push_back(f);
}
virtual ~bit_blaster_model_converter() {
~bit_blaster_model_converter() override {
}
void collect_bits(obj_hashtable<func_decl> & bits) {
@ -123,10 +123,7 @@ struct bit_blaster_model_converter : public model_converter {
SASSERT(is_uninterp_const(bit));
func_decl * bit_decl = to_app(bit)->get_decl();
expr * bit_val = old_model->get_const_interp(bit_decl);
if (bit_val == 0) {
goto bail;
}
if (m().is_true(bit_val))
if (bit_val != nullptr && m().is_true(bit_val))
val++;
}
}
@ -141,18 +138,12 @@ struct bit_blaster_model_converter : public model_converter {
func_decl * bit_decl = to_app(bit)->get_decl();
expr * bit_val = old_model->get_const_interp(bit_decl);
// remark: if old_model does not assign bit_val, then assume it is false.
if (bit_val == 0) {
goto bail;
}
if (!util.is_zero(bit_val))
if (bit_val != nullptr && !util.is_zero(bit_val))
val++;
}
}
new_val = util.mk_numeral(val, bv_sz);
new_model->register_decl(m_vars.get(i), new_val);
continue;
bail:
new_model->register_decl(m_vars.get(i), mk_bv(bs, *old_model));
}
}