diff --git a/eval_tree.cc b/eval_tree.cc
index af2382380..80bcb867e 100644
--- a/eval_tree.cc
+++ b/eval_tree.cc
@@ -1507,26 +1507,29 @@ NetExpr*NetETernary::blended_arguments_(const NetExpr*te, const NetExpr*fe) cons
       return rc;
 }
 
-NetExpr* NetEUnary::eval_tree_real_()
+NetExpr* NetEUnary::eval_tree_real_(const NetExpr*ex) const
 {
-      NetECReal*val= dynamic_cast<NetECReal*> (expr_), *res;
+      const NetECReal*val= dynamic_cast<const NetECReal*> (ex);
       if (val == 0) return 0;
 
+      double res_val = val->value().as_double();
       switch (op_) {
 	  case '+':
-	    res = new NetECReal(val->value());
-	    ivl_assert(*this, res);
 	    break;
 
 	  case '-':
-	    res = new NetECReal(-(val->value()));
-	    ivl_assert(*this, res);
+	    res_val = -res_val;
+	    break;
+
+	  case 'm':
+	    if (res_val < 0.0) res_val = -res_val;
 	    break;
 
 	  default:
 	    return 0;
       }
-
+      NetECReal *res = new NetECReal( verireal(res_val) );
+      ivl_assert(*this, res);
       res->set_line(*this);
 
       if (debug_eval_tree)
@@ -1539,9 +1542,14 @@ NetExpr* NetEUnary::eval_tree_real_()
 NetExpr* NetEUnary::eval_tree()
 {
       eval_expr(expr_);
-      if (expr_type() == IVL_VT_REAL) return eval_tree_real_();
+      return eval_arguments_(expr_);
+}
 
-      NetEConst*rval = dynamic_cast<NetEConst*>(expr_);
+NetExpr* NetEUnary::eval_arguments_(const NetExpr*ex) const
+{
+      if (expr_type() == IVL_VT_REAL) return eval_tree_real_(ex);
+
+      const NetEConst*rval = dynamic_cast<const NetEConst*>(ex);
       if (rval == 0) return 0;
 
       verinum val = rval->value();
@@ -1563,6 +1571,17 @@ NetExpr* NetEUnary::eval_tree()
 	    }
 	    break;
 
+	  case 'm':
+	    if (!val.is_defined()) {
+		  for (unsigned idx = 0 ;  idx < val.len() ;  idx += 1)
+			val.set(idx, verinum::Vx);
+	    } else if (val.is_negative()) {
+		  verinum tmp (verinum::V0, val.len());
+		  tmp.has_sign(val.has_sign());
+		  val = verinum(tmp - val, val.len());
+	    }
+	    break;
+
 	  case '~':
 	      /* Bitwise not is even simpler than logical
 	         not. Just invert all the bits of the operand and
@@ -1604,11 +1623,11 @@ NetExpr* NetEUBits::eval_tree()
       return NetEUnary::eval_tree();
 }
 
-NetEConst* NetEUReduce::eval_tree_real_()
+NetEConst* NetEUReduce::eval_tree_real_(const NetExpr*ex) const
 {
       ivl_assert(*this, op_ == '!');
 
-      NetECReal*val= dynamic_cast<NetECReal*> (expr_);
+      const NetECReal*val= dynamic_cast<const NetECReal*> (ex);
       if (val == 0) return 0;
 
       verinum::V res = val->value().as_double() == 0.0 ? verinum::V1 :
@@ -1628,9 +1647,14 @@ NetEConst* NetEUReduce::eval_tree_real_()
 NetEConst* NetEUReduce::eval_tree()
 {
       eval_expr(expr_);
-      if (expr_type() == IVL_VT_REAL) return eval_tree_real_();
+      return eval_arguments_(expr_);
+}
 
-      NetEConst*rval = dynamic_cast<NetEConst*>(expr_);
+NetEConst* NetEUReduce::eval_arguments_(const NetExpr*ex) const
+{
+      if (expr_type() == IVL_VT_REAL) return eval_tree_real_(ex);
+
+      const NetEConst*rval = dynamic_cast<const NetEConst*>(ex);
       if (rval == 0) return 0;
 
       verinum val = rval->value();
diff --git a/net_func_eval.cc b/net_func_eval.cc
index 1187e9433..827e98a5d 100644
--- a/net_func_eval.cc
+++ b/net_func_eval.cc
@@ -293,6 +293,14 @@ NetExpr* NetEConst::evaluate_function(const LineInfo&,
       return res;
 }
 
+NetExpr* NetECReal::evaluate_function(const LineInfo&,
+				      map<perm_string,NetExpr*>&) const
+{
+      NetECReal*res = new NetECReal(value_);
+      res->set_line(*this);
+      return res;
+}
+
 NetExpr* NetESelect::evaluate_function(const LineInfo&loc,
 				    map<perm_string,NetExpr*>&context_map) const
 {
@@ -372,6 +380,17 @@ NetExpr* NetETernary::evaluate_function(const LineInfo&loc,
       return res;
 }
 
+NetExpr* NetEUnary::evaluate_function(const LineInfo&loc,
+				    map<perm_string,NetExpr*>&context_map) const
+{
+      NetExpr*val = expr_->evaluate_function(loc, context_map);
+      if (val == 0) return 0;
+
+      NetExpr*res = eval_arguments_(val);
+      delete val;
+      return res;
+}
+
 NetExpr* NetEUFunc::evaluate_function(const LineInfo&loc,
 				      map<perm_string,NetExpr*>&context_map) const
 {
diff --git a/netlist.h b/netlist.h
index 7c08f1061..9d97165bd 100644
--- a/netlist.h
+++ b/netlist.h
@@ -1943,6 +1943,8 @@ class NetECReal  : public NetExpr {
       virtual void dump(ostream&) const;
 
       virtual NetECReal* dup_expr() const;
+      virtual NetExpr*evaluate_function(const LineInfo&loc,
+					std::map<perm_string,NetExpr*>&ctx) const;
       virtual NetNet*synthesize(Design*, NetScope*scope, NetExpr*);
       virtual NexusSet* nex_input(bool rem_out = true);
 
@@ -4100,6 +4102,8 @@ class NetEUnary  : public NetExpr {
 
       virtual NetEUnary* dup_expr() const;
       virtual NetExpr* eval_tree();
+      virtual NetExpr* evaluate_function(const LineInfo&loc,
+					 std::map<perm_string,NetExpr*>&ctx) const;
       virtual NetNet* synthesize(Design*, NetScope*scope, NetExpr*root);
 
       virtual ivl_variable_type_t expr_type() const;
@@ -4112,7 +4116,8 @@ class NetEUnary  : public NetExpr {
       NetExpr* expr_;
 
     private:
-      virtual NetExpr* eval_tree_real_();
+      virtual NetExpr* eval_arguments_(const NetExpr*ex) const;
+      virtual NetExpr* eval_tree_real_(const NetExpr*ex) const;
 };
 
 class NetEUBits : public NetEUnary {
@@ -4140,7 +4145,8 @@ class NetEUReduce : public NetEUnary {
       virtual ivl_variable_type_t expr_type() const;
 
     private:
-      virtual NetEConst* eval_tree_real_();
+      virtual NetEConst* eval_arguments_(const NetExpr*ex) const;
+      virtual NetEConst* eval_tree_real_(const NetExpr*ex) const;
 };
 
 class NetECast : public NetEUnary {