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simplify more aggressively in horner scheme, imlement is_linear

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2019-08-21 10:31:13 -07:00
parent eb5b9557ed
commit 81a9edae7e
4 changed files with 40 additions and 9 deletions
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19
src/math/lp/horner.cpp
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@ -133,6 +133,20 @@ nex * horner::nexvar(lpvar j, cross_nested& cn) const {
return e;
}
nex * horner::nexvar(const rational & coeff, lpvar j, cross_nested& cn) const {
// todo: consider deepen the recursion
if (!c().is_monomial_var(j))
return cn.mk_mul(cn.mk_scalar(coeff), cn.mk_var(j));
const monomial& m = c().emons()[j];
nex_mul * e = cn.mk_mul(cn.mk_scalar(coeff));
for (lpvar k : m.vars()) {
e->add_child(cn.mk_var(k));
CTRACE("nla_horner", c().is_monomial_var(k), c().print_var(k, tout) << "\n";);
}
return e;
}
template <typename T> nex_sum* horner::create_sum_from_row(const T& row, cross_nested& cn) {
TRACE("nla_horner", tout << "row="; m_core->print_term(row, tout) << "\n";);
SASSERT(row.size() > 1);
@ -140,8 +154,9 @@ template <typename T> nex_sum* horner::create_sum_from_row(const T& row, cross_n
for (const auto &p : row) {
if (p.coeff().is_one())
e->add_child(nexvar(p.var(), cn));
else
e->add_child(cn.mk_mul(cn.mk_scalar(p.coeff()), nexvar(p.var(), cn)));
else {
e->add_child(nexvar(p.coeff(), p.var(), cn));
}
}
return e;
}