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fill in ad-hoc interpretation for division by 0. #2561

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-10-01 20:07:31 -07:00
parent 8a568d438f
commit a635049e23
1 changed files with 12 additions and 0 deletions
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12
src/model/model_evaluator.cpp
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@ -51,6 +51,7 @@ struct evaluator_cfg : public default_rewriter_cfg {
fpa_rewriter m_f_rw;
seq_rewriter m_seq_rw;
array_util m_ar;
arith_util m_au;
unsigned long long m_max_memory;
unsigned m_max_steps;
bool m_model_completion;
@ -75,6 +76,7 @@ struct evaluator_cfg : public default_rewriter_cfg {
m_f_rw(m),
m_seq_rw(m),
m_ar(m),
m_au(m),
m_pinned(m) {
bool flat = true;
m_b_rw.set_flat(flat);
@ -331,6 +333,16 @@ struct evaluator_cfg : public default_rewriter_cfg {
return BR_REWRITE_FULL;
}
rational r;
if (is_decl_of(f, m_au.get_family_id(), OP_DIV) && m_au.is_numeral(args[1], r) && r.is_zero()) {
result = m_au.mk_real(0);
return BR_DONE;
}
if (is_decl_of(f, m_au.get_family_id(), OP_IDIV) && m_au.is_numeral(args[1], r) && r.is_zero()) {
result = m_au.mk_int(0);
return BR_DONE;
}
return BR_FAILED;
}