Fix pad, second try (#465)

* Bugfix: pad is max(width,const) during constprop

* Fixed max syntax

1 files changed, 2 insertions, 2 deletions

diff --git a/src/main/scala/firrtl/passes/ConstProp.scala b/src/main/scala/firrtl/passes/ConstProp.scala
index 8736ee31..bb3fb1e8 100644
--- a/src/main/scala/firrtl/passes/ConstProp.scala
+++ b/src/main/scala/firrtl/passes/ConstProp.scala
@@ -196,8 +196,8 @@ object ConstProp extends Pass {
       case _ => e
     }
     case Pad => e.args.head match {
-      case UIntLiteral(v, _) => UIntLiteral(v, IntWidth(e.consts.head))
-      case SIntLiteral(v, _) => SIntLiteral(v, IntWidth(e.consts.head))
+      case UIntLiteral(v, IntWidth(w)) => UIntLiteral(v, IntWidth(e.consts.head max w))
+      case SIntLiteral(v, IntWidth(w)) => SIntLiteral(v, IntWidth(e.consts.head max w))
       case _ if bitWidth(e.args.head.tpe) == e.consts.head => e.args.head
       case _ => e
     }