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This commit is contained in:
Nikolaj Bjorner 2021-07-18 12:05:52 +02:00
parent 439e499dd3
commit 0bfd24aae9
1 changed files with 22 additions and 0 deletions
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22
src/sat/smt/q_model_fixer.cpp
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@ -141,6 +141,19 @@ namespace q {
mdl.register_decl(f_new, fi);
}
/*
* For function f(...,t_idx, ..) collect the values of terms at position idx of f
* as "values".
* Map t_idx |-> mdl(t_idx)
* and mdl(t_idx) |-> t_idx
* Sort the values as [v_1, v_2, ..., v_n] with corresponding terms
* [t_1, t_2, ..., t_n]
*
* Create the term if p(x) = if x <= v_1 then t_1 else if x <= v_2 then t_2 else ... t_n
* where p is a fresh function
* and return p(x)
*/
expr_ref model_fixer::add_projection_function(model& mdl, func_decl* f, unsigned idx) {
sort* srt = f->get_domain(idx);
projection_function* proj = get_projection(srt);
@ -230,6 +243,15 @@ namespace q {
return value;
}
/**
* We are given a term f(...,arg_i,..) and value = mdl(arg_i)
* Create
* 1 the bounds t_j <= arg_i < t_{j+1} where
* v_j <= value < v_{j+1} for the corresponding values of t_j, t_{j+1}
* 2 or the bound arg_i < t_0 if value < v_0
* 3 or the bound arg_i >= t_last if value > v_last
*/
void model_fixer::invert_arg(app* t, unsigned i, expr* value, expr_ref_vector& lits) {
TRACE("q", tout << "invert-arg " << mk_pp(t, m) << " " << i << " " << mk_pp(value, m) << "\n";);
auto const* md = get_projection_data(t->get_decl(), i);