From 72b69311072fd48b7c0d5c0b0b318b4dbe5da154 Mon Sep 17 00:00:00 2001
From: Jack Koenig
Date: Wed, 31 Oct 2018 11:36:36 -0700
Subject: Speed up ExpandConnects by replacing foldLeft + List appends with
 flatMap

---
 src/main/scala/firrtl/passes/Passes.scala | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

(limited to 'src')

diff --git a/src/main/scala/firrtl/passes/Passes.scala b/src/main/scala/firrtl/passes/Passes.scala
index 3658d368..45413348 100644
--- a/src/main/scala/firrtl/passes/Passes.scala
+++ b/src/main/scala/firrtl/passes/Passes.scala
@@ -125,13 +125,13 @@ object ExpandConnects extends Pass {
           case sx: DefMemory => genders(sx.name) = MALE; sx
           case sx: DefNode => genders(sx.name) = MALE; sx
           case sx: IsInvalid =>
-            val invalids = (create_exps(sx.expr) foldLeft Seq[Statement]())(
-               (invalids,  expx) => gender(set_gender(expx)) match {
-                  case BIGENDER => invalids :+ IsInvalid(sx.info, expx)
-                  case FEMALE => invalids :+ IsInvalid(sx.info, expx)
-                  case _ => invalids
+            val invalids = create_exps(sx.expr).flatMap { case expx =>
+               gender(set_gender(expx)) match {
+                  case BIGENDER => Some(IsInvalid(sx.info, expx))
+                  case FEMALE => Some(IsInvalid(sx.info, expx))
+                  case _ => None
                }
-            )
+            }
             invalids.size match {
                case 0 => EmptyStmt
                case 1 => invalids.head
-- 
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