fix #6153

Z3Prover · Jul 12, 2022 · ca80d99 · ca80d99
1 parent 43cf053
commit ca80d99
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Showing 2 changed files with 6 additions and 2 deletions.
diff --git a/src/smt/theory_arith_core.h b/src/smt/theory_arith_core.h
@@ -563,15 +563,16 @@ namespace smt {
         if (!m_util.is_zero(divisor)) {
             // if divisor is zero, then idiv and mod are uninterpreted functions.
             expr_ref div(m), mod(m), zero(m), abs_divisor(m), one(m);
-            expr_ref eqz(m), eq(m), lower(m), upper(m);
+            expr_ref eqz(m), eq(m), lower(m), upper(m), qr(m);
             div         = m_util.mk_idiv(dividend, divisor);
             mod         = m_util.mk_mod(dividend, divisor);
             zero        = m_util.mk_int(0);
             one        = m_util.mk_int(1);
             abs_divisor = m_util.mk_sub(m.mk_ite(m_util.mk_lt(divisor, zero), m_util.mk_sub(zero, divisor), divisor), one);
             s(abs_divisor);
             eqz         = m.mk_eq(divisor, zero);
-            eq          = m.mk_eq(m_util.mk_add(m_util.mk_mul(divisor, div), mod), dividend);
+            qr          = m_util.mk_add(m_util.mk_mul(divisor, div), mod);
+            eq          = m.mk_eq(qr, dividend);
             lower       = m_util.mk_ge(mod, zero);
             upper       = m_util.mk_le(mod, abs_divisor);
             TRACE("div_axiom_bug",
@@ -585,6 +586,8 @@ namespace smt {
             mk_axiom(eqz, upper, !m_util.is_numeral(abs_divisor));
             rational k;
 
+            m_arith_eq_adapter.mk_axioms(ensure_enode(qr), ensure_enode(mod));
+
             if (m_util.is_zero(dividend)) {
                 mk_axiom(eqz, m.mk_eq(div, zero));
                 mk_axiom(eqz, m.mk_eq(mod, zero));

diff --git a/src/smt/theory_lra.cpp b/src/smt/theory_lra.cpp
@@ -1271,6 +1271,7 @@ class theory_lra::imp {
             mk_axiom(eqz, eq);
             mk_axiom(eqz, mod_ge_0);
             mk_axiom(eqz, mod_lt_q);
+            m_arith_eq_adapter.mk_axioms(th.ensure_enode(mod_r), th.ensure_enode(p));
 
             if (a.is_zero(p)) {
                 mk_axiom(eqz, mk_literal(m.mk_eq(div, zero)));