Fixed propagation of width hints for $signed() and $unsigned()

diff --git a/frontends/ast/genrtlil.cc b/frontends/ast/genrtlil.cc
index f3ca0c787a971bdcb023509dd500dc54161c3bcd..ce34f708abf93e492842f1d3a4b15a472283fd37 100644 (file)
--- a/frontends/ast/genrtlil.cc
+++ b/frontends/ast/genrtlil.cc
@@ -950,7 +950,10 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
        // just pass thru the signal. the parent will evaluated the is_signed property and inperpret the SigSpec accordingly
        case AST_TO_SIGNED:
        case AST_TO_UNSIGNED: {
-                       RTLIL::SigSpec sig = children[0]->genRTLIL();
+                       int sub_width_hint;
+                       bool sub_sign_hint;
+                       children[0]->detectSignWidth(sub_width_hint, sub_sign_hint);
+                       RTLIL::SigSpec sig = children[0]->genRTLIL(width_hint, sub_sign_hint);
                        is_signed = sign_hint;
                        return sig;
        }