mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-04-23 17:15:31 +00:00
Code Activity

remove ad-hoc rewriting of division related to comparison.

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-01-27 17:33:14 -08:00
parent eea7805551
commit ca11dc1fc5
1 changed files with 0 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

26
src/ast/rewriter/arith_rewriter.cpp
View file

@ -457,32 +457,6 @@ br_status arith_rewriter::mk_le_ge_eq_core(expr * arg1, expr * arg2, op_kind kin
st = BR_DONE;
}
}
expr* e1 = nullptr, *e2 = nullptr;
if (m_util.is_div(arg1, e1, e2) && (!is_numeral(e2, a2) || !a2.is_zero())) {
new_arg1 = e1;
new_arg2 = m_util.mk_mul(e2, arg2);
expr_ref zero(m_util.mk_numeral(rational(0), m_util.is_int(arg1)), m());
expr_ref is_zero(m().mk_eq(zero, e2), m());
expr_ref div0(m_util.mk_div(e1, zero), m());
expr_ref mul2(m_util.mk_mul(e2, arg2), m());
switch (kind) {
case LE:
result = m().mk_or(
m().mk_and(is_zero, m_util.mk_le(div0, arg2)),
m().mk_and(m().mk_not(m_util.mk_le(e2, zero)), m_util.mk_le(e1, mul2)),
m().mk_and(m().mk_not(m_util.mk_ge(e2, zero)), m_util.mk_ge(e1, mul2)));
return BR_REWRITE_FULL;
case GE:
result = m().mk_or(
m().mk_and(is_zero, m_util.mk_ge(div0, arg2)),
m().mk_and(m().mk_not(m_util.mk_le(e2, zero)), m_util.mk_ge(e1, mul2)),
m().mk_and(m().mk_not(m_util.mk_ge(e2, zero)), m_util.mk_le(e1, mul2)));
return BR_REWRITE_FULL;
case EQ:
result = m().mk_ite(is_zero, m().mk_eq(div0, arg2), m().mk_eq(e1, mul2));
return BR_REWRITE_FULL;
}
}
expr* c = nullptr, *t = nullptr, *e = nullptr;
if (m().is_ite(arg1, c, t, e) && is_numeral(t, a1) && is_numeral(arg2, a2)) {
switch (kind) {