From acb55916dad1cfe7ede5fc18852bf3572a3944d2 Mon Sep 17 00:00:00 2001
From: Cary R <cygcary@yahoo.com>
Date: Mon, 13 Sep 2010 15:45:19 -0700
Subject: [PATCH] Resize constants in eval_expr when needed.

If we are given an unsized constant that is smaller then the requested
width then resize the constant to fit.
---
 netmisc.cc | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/netmisc.cc b/netmisc.cc
index f2644cc56..8bde89a53 100644
--- a/netmisc.cc
+++ b/netmisc.cc
@@ -289,8 +289,15 @@ NetExpr* elab_and_eval(Design*des, NetScope*scope,
 void eval_expr(NetExpr*&expr, int prune_width)
 {
       assert(expr);
-      if (dynamic_cast<NetEConst*>(expr)) return;
       if (dynamic_cast<NetECReal*>(expr)) return;
+	/* Resize a constant if allowed and needed. */
+      if (NetEConst *tmp = dynamic_cast<NetEConst*>(expr)) {
+	    if (prune_width <= 0) return;
+	    if (tmp->has_width()) return;
+	    if ((unsigned)prune_width <= tmp->expr_width()) return;
+	    expr = pad_to_width(expr, (unsigned)prune_width, *expr);
+	    return;
+      }
 
       NetExpr*tmp = expr->eval_tree(prune_width);
       if (tmp != 0) {