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fix #8109

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default behavior is conservative: if the body of a recursive function contains uninterpreted variables they are not rewritten.
Model evaluation will bind values to uninterpreted variables so the filter should not apply here.
This commit is contained in:
Nikolaj Bjorner 2026-01-07 10:56:50 -08:00
parent fbf65c5d76
commit ccc2a34444
5 changed files with 20 additions and 3 deletions
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14
src/ast/rewriter/recfun_rewriter.cpp
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@ -21,6 +21,12 @@ Author:
#include "ast/rewriter/var_subst.h"
#include "ast/datatype_decl_plugin.h"
#include "ast/for_each_expr.h"
#include "params/rewriter_params.hpp"
void recfun_rewriter::updt_params(params_ref const &p) {
rewriter_params rp(p);
m_recfun_unfold = rp.unfold_recursive_functions();
}
br_status recfun_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * const * args, expr_ref & result) {
if (m_rec.is_defined(f) && num_args > 0) {
@ -34,9 +40,11 @@ br_status recfun_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr *
for (unsigned i = 0; i < num_args; ++i)
if (!m.is_value(args[i]))
safe_to_subst = false;
for (auto t : subterms::all(expr_ref(r, m)))
if (is_uninterp(t))
return BR_FAILED;
if (!m_recfun_unfold) {
for (auto t : subterms::all(expr_ref(r, m)))
if (is_uninterp(t))
return BR_FAILED;
}
// check if there is an argument that is a constructor
// such that the recursive function can be partially evaluated.