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rewrite to address some cases like #1203, updates to division handling in NRA

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-08-12 13:24:54 -07:00
parent 7b47b0380e
commit f99048f3e7
4 changed files with 48 additions and 24 deletions
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7
src/ast/rewriter/arith_rewriter.cpp
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@ -755,6 +755,13 @@ br_status arith_rewriter::mk_mod_core(expr * arg1, expr * arg2, expr_ref & resul
return BR_DONE;
}
if (arg1 == arg2 && !m_util.is_numeral(arg2)) {
expr_ref zero(m_util.mk_int(0), m()), abs(m());
mk_abs_core(arg2, abs);
result = m().mk_ite(m().mk_eq(arg2, zero), m_util.mk_mod(zero, zero), abs);
return BR_DONE;
}
// mod is idempotent on non-zero modulus.
expr* t1, *t2;
if (m_util.is_mod(arg1, t1, t2) && t2 == arg2 && m_util.is_numeral(arg2, v2, is_int) && is_int && !v2.is_zero()) {