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rewrite to_int comparisons

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This commit is contained in:
Nikolaj Bjorner 2020-07-30 10:23:23 -07:00
parent f6cbe3a016
commit 69b4a819a6
1 changed files with 18 additions and 0 deletions
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18
src/ast/rewriter/arith_rewriter.cpp
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@ -616,6 +616,24 @@ br_status arith_rewriter::mk_le_ge_eq_core(expr * arg1, expr * arg2, op_kind kin
case EQ: result = m().mk_ite(c, m().mk_eq(t, arg2), m().mk_eq(e, arg2)); return BR_REWRITE2;
}
}
if (m_util.is_to_int(arg2) && is_numeral(arg1)) {
kind = inv(kind);
std::swap(arg1, arg2);
}
if (m_util.is_to_int(arg1, t) && is_numeral(arg2, a2)) {
switch (kind) {
case LE:
result = m_util.mk_lt(t, m_util.mk_numeral(a2+1, false));
return BR_DONE;
case GE:
result = m_util.mk_ge(t, m_util.mk_numeral(a2, false));
return BR_REWRITE1;
case EQ:
result = m_util.mk_ge(t, m_util.mk_numeral(a2, false));
result = m().mk_and(m_util.mk_lt(t, m_util.mk_numeral(a2+1, false)), result);
return BR_DONE;
}
}
if ((m_arith_lhs || m_arith_ineq_lhs) && is_numeral(arg2, a2) && is_neg_poly(arg1, new_arg1)) {
a2.neg();
new_arg2 = m_util.mk_numeral(a2, m_util.is_int(new_arg1));