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simplify bounds by subsumption checks

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2023-06-09 10:21:38 -07:00
parent 1006955215
commit 555ccc8aab
1 changed files with 35 additions and 1 deletions
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36
src/ast/simplifiers/bound_simplifier.cpp
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@ -58,9 +58,9 @@ struct bound_simplifier::rw : public rewriter_tpl<rw_cfg> {
br_status bound_simplifier::reduce_app(func_decl* f, unsigned num_args, expr* const* args, expr_ref& result, proof_ref& pr) {
rational N, hi, lo;
if (a.is_mod(f) && num_args == 2 && a.is_numeral(args[1], N)) {
expr* x = args[0];
auto& im = m_interval;
scoped_dep_interval i(im);
expr* x = args[0];
get_bounds(x, i);
if (im.upper_is_inf(i) || im.lower_is_inf(i))
return BR_FAILED;
@ -83,6 +83,40 @@ br_status bound_simplifier::reduce_app(func_decl* f, unsigned num_args, expr* co
}
IF_VERBOSE(2, verbose_stream() << "potentially missed simplification: " << mk_pp(x, m) << " " << lo << " " << hi << " not reduced\n");
}
expr* x = nullptr;
bool strict = false;
bool is_upper_bound =
(a.is_le(f) && a.is_numeral(args[1], N) && (x = args[0], true)) ||
(a.is_ge(f) && a.is_numeral(args[0], N) && (x = args[1], true));
if (is_upper_bound) {
if (has_upper(x, hi, strict) && !strict && N >= hi) {
result = m.mk_true();
return BR_DONE;
}
if (has_lower(x, lo, strict) && !strict && N < lo) {
result = m.mk_false();
return BR_DONE;
}
return BR_FAILED;
}
bool is_lower_bound =
(a.is_le(f) && a.is_numeral(args[0], N) && (x = args[1], true)) ||
(a.is_ge(f) && a.is_numeral(args[1], N) && (x = args[0], true));
if (is_lower_bound) {
if (has_lower(x, lo, strict) && !strict && N <= lo) {
result = m.mk_true();
return BR_DONE;
}
if (has_upper(x, hi, strict) && !strict && N > hi) {
result = m.mk_false();
return BR_DONE;
}
return BR_FAILED;
}
return BR_FAILED;
}