From 4d9e3007aedffd41fd397e70f151883a967fc3a7 Mon Sep 17 00:00:00 2001
From: Andrew Waterman
Date: Thu, 14 Apr 2016 22:23:52 -0700
Subject: Improve performance of hashing HasId (e.g. Data)

---
 src/main/scala/Chisel/internal/Builder.scala | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/main/scala/Chisel/internal/Builder.scala b/src/main/scala/Chisel/internal/Builder.scala
index e040b375..73dd5906 100644
--- a/src/main/scala/Chisel/internal/Builder.scala
+++ b/src/main/scala/Chisel/internal/Builder.scala
@@ -46,6 +46,11 @@ private[Chisel] trait HasId {
   _parent.foreach(_.addId(this))
 
   private[Chisel] val _id = Builder.idGen.next
+  override def hashCode = _id.toInt
+  override def equals(that: Any) = that match {
+    case x: HasId => _id == x._id
+    case _ => false
+  }
 
   private var _ref: Option[Arg] = None
   private[Chisel] def setRef(imm: Arg): Unit = _ref = Some(imm)
-- 
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