fix #2652

Signed-off-by: Nikolaj Bjorner <[email protected]>

Author: NikolajBjorner

src/ast/fpa/bv2fpa_converter.cpp

@@ -466,16 +466,14 @@ void bv2fpa_converter::convert_uf2bvuf(model_core * mc, model_core * target_mode
                 }
                 continue;
             }
-            // kv.m_value contains the model for the unspecified cases of kv.m_key.
-            // TBD: instead of mapping the interpretation of f to just the graph for the
-            // uninterpreted case, map it to a condition, ite, that filters out the
-            // pre-condition for which argument combinations are interpreted vs. uninterpreted.
-            // if (m_fpa_util.is_to_ieee_bv(f)) {
-            // }
-            // if (m_fpa_util.is_to_sbv(f)) {
-            // }
 
 
+            //  f is a floating point function: f(x,y) : Float
+            //  f_uf is a bit-vector function: f_uf(xB,yB) : BitVec
+            //  then there is f_def: f_Bv(xB, yB) := if(range(xB),.., f_uf(xB,yB))
+            //  f(x,y) := to_float(if(range(to_bv(x)), ... f_uf(to_bv(xB), to_bv(yB)))) - not practical
+            //         := if(range_fp(x), ...., to_float(f_uf(...))                     - approach
+                                                               
             target_model->register_decl(f, convert_func_interp(mc, f, f_uf));            
         }
     }

src/ast/fpa/fpa2bv_converter.cpp

@@ -3201,26 +3201,6 @@ void fpa2bv_converter::mk_to_bv(func_decl * f, unsigned num, expr * const * args
     sort * xs = m.get_sort(x);
     sort * bv_srt = f->get_range();
 
-#if 0
-    // for this to work, the following is required:
-    // 1. split_fp should succeed even if the argument does not satisfy is_fp
-    //    we would need functions to access the sgn, exp and sig fields
-    // 2. an inverse of bv2rm, here called rm2bv. 
-    expr_ref arg1(m), arg2(m), _rm(m);
-    
-    var_subst vsubst(m, false);
-    expr* def = get_bv_def(f);
-    if (def) {
-        result = vsubst(def, 2, args);
-        return;
-    }    
-    arg1 = m.mk_var(0, m.get_sort(args[0]));
-    arg2 = m.mk_var(1, m.get_sort(args[1]));
-    _rm = m_util.mk_rm2bv(arg1);    
-    rm = _rm;
-    x = arg2;
-#endif
-
     expr_ref sgn(m), sig(m), exp(m), lz(m);
     unpack(x, sgn, sig, exp, lz, true);
 
@@ -3370,10 +3350,6 @@ void fpa2bv_converter::mk_to_bv(func_decl * f, unsigned num, expr * const * args
     result = m.mk_ite(c2, v2, result);
     result = m.mk_ite(c1, v1, result);
 
-#if 0
-    set_bv_def(f, result);    
-    result = vsubst(result, 2, args);
-#endif
     SASSERT(is_well_sorted(m, result));
 }
 

src/smt/smt_model_checker.cpp

@@ -238,7 +238,7 @@ namespace smt {
                 sk_value = get_type_compatible_term(sk_value);
             }
             func_decl * f = nullptr;
-            if (autil.is_as_array(sk_value, f) && cex->get_func_interp(f)) {
+            if (autil.is_as_array(sk_value, f) && cex->get_func_interp(f) && cex->get_func_interp(f)->get_interp()) {
                 expr_ref body(cex->get_func_interp(f)->get_interp(), m);
                 ptr_vector<sort> sorts(f->get_arity(), f->get_domain());
                 svector<symbol> names;