mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2026-04-27 22:33:35 +00:00
Code Activity

overflow example works

Browse source 
- introduce weak/strong eval to temper unit propagation to use only weak evaluation.
- harness the amount of interval propagation provided on overflow constraints
- weak evaluation on overflow constraints is now trivialized
- viable insertion also does conflict detection
This commit is contained in:
Nikolaj Bjorner 2024-01-04 15:55:24 -08:00
parent 5fc208cefc
commit cb672c7992
14 changed files with 122 additions and 76 deletions
Download patch file Download diff file Expand all files Collapse all files

9
src/sat/smt/polysat/ule_constraint.cpp
View file

@ -131,13 +131,10 @@ namespace polysat {
unsigned const rhs_vars = rhs.free_vars().size();
unsigned const diff_vars = (lhs - rhs).free_vars().size();
if (diff_vars < lhs_vars || diff_vars < rhs_vars) {
LOG("reduce number of varables");
// verbose_stream() << "IN: " << ule_pp(to_lbool(is_positive), lhs, rhs) << "\n";
if (lhs_vars <= rhs_vars)
rhs = lhs - rhs - 1;
else
lhs = rhs - lhs;
// verbose_stream() << "OUT: " << ule_pp(to_lbool(is_positive), lhs, rhs) << "\n";
}
}
@ -231,7 +228,7 @@ namespace polysat {
lhs *= x;
SASSERT(lhs.leading_coefficient().is_power_of_two());
}
// verbose_stream() << "simplified " << lhs << " <= " << rhs << "\n";
TRACE("bv", tout << "simplified " << lhs << " <= " << rhs << "\n");
} // simplify_impl
}
@ -346,11 +343,11 @@ namespace polysat {
return eval(lhs(), rhs());
}
lbool ule_constraint::eval(assignment const& a) const {
lbool ule_constraint::weak_eval(assignment const& a) const {
return eval(a.apply_to(lhs()), a.apply_to(rhs()));
}
lbool ule_constraint::eval_unfold(assignment const& a) const {
lbool ule_constraint::strong_eval(assignment const& a) const {
return eval(a.apply_to(unfold_lhs()), a.apply_to(unfold_rhs()));
}