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add case for abs (normally simplified, but not with default_tactic=smt).

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Nikolaj Bjorner 2022-01-09 11:55:21 -08:00
parent 671d071e54
commit f1bf660adc
4 changed files with 15 additions and 3 deletions
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8
src/sat/smt/arith_axioms.cpp
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@ -49,6 +49,14 @@ namespace arith {
}
}
void solver::mk_abs_axiom(app* n) {
expr* x = nullptr;
VERIFY(a.is_abs(n, x));
literal is_nonneg = mk_literal(a.mk_ge(x, a.mk_numeral(rational::zero(), n->get_sort())));
add_clause(~is_nonneg, eq_internalize(n, x));
add_clause(is_nonneg, eq_internalize(n, a.mk_uminus(x)));
}
// t = n^0
void solver::mk_power0_axioms(app* t, app* n) {
expr_ref p0(a.mk_power0(n, t->get_arg(1)), m);