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port Grobner: fixes in nex simplifications

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2019-11-01 14:15:54 -07:00
parent ede4310b32
commit 3e0cf4b96d
4 changed files with 117 additions and 90 deletions
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54
src/math/lp/nex.h
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@ -473,32 +473,36 @@ inline rational get_nex_val(const nex* e, std::function<rational (unsigned)> var
}
inline std::unordered_set<lpvar> get_vars_of_expr(const nex *e ) {
std::unordered_set<lpvar> r;
switch (e->type()) {
case expr_type::SCALAR:
return r;
case expr_type::SUM:
{
for (auto c: *to_sum(e))
for ( lpvar j : get_vars_of_expr(c))
r.insert(j);
}
return r;
case expr_type::MUL:
{
for (auto &c: *to_mul(e))
for ( lpvar j : get_vars_of_expr(c.e()))
r.insert(j);
}
return r;
case expr_type::VAR:
r.insert(to_var(e)->var());
return r;
default:
TRACE("nla_cn_details", tout << e->type() << "\n";);
SASSERT(false);
return r;
std::unordered_set<lpvar> r;
switch (e->type()) {
case expr_type::SCALAR:
return r;
case expr_type::SUM:
{
for (auto c: *to_sum(e))
for ( lpvar j : get_vars_of_expr(c))
r.insert(j);
}
return r;
case expr_type::MUL:
{
for (auto &c: *to_mul(e))
for ( lpvar j : get_vars_of_expr(c.e()))
r.insert(j);
}
return r;
case expr_type::VAR:
r.insert(to_var(e)->var());
return r;
default:
TRACE("nla_cn_details", tout << e->type() << "\n";);
SASSERT(false);
return r;
}
}
inline bool is_zero_scalar(nex *e) {
return e->is_scalar() && to_scalar(e)->value().is_zero();
}
}