From d4a4ee78a36783b5d8d90c4382b4332a70485244 Mon Sep 17 00:00:00 2001
From: Andrew Waterman
Date: Mon, 10 Aug 2015 17:44:35 -0700
Subject: Make Bits.toBool safe

It now fails if the width is unknown or is not equal to 1.
We could consider relaxing this later, defining it as this.orR.
---
 src/main/scala/Chisel/Core.scala | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/main/scala/Chisel/Core.scala b/src/main/scala/Chisel/Core.scala
index 4b8d2ca3..1ab84681 100644
--- a/src/main/scala/Chisel/Core.scala
+++ b/src/main/scala/Chisel/Core.scala
@@ -639,7 +639,11 @@ sealed abstract class Bits(dirArg: Direction, width: Width, override val litArg:
   def asUInt(): UInt
   final def toSInt(): SInt = asSInt
   final def toUInt(): UInt = asUInt
-  def toBool(): Bool = this(0)
+
+  def toBool(): Bool = width match {
+    case KnownWidth(1) => this(0)
+    case _ => throwException(s"can't covert UInt<$width> to Bool")
+  }
 
   override def toBits = asUInt
   override def fromBits(n: Bits): this.type = {
-- 
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