From 0c13c00d0831ce0cc9836b327166afbfb20879be Mon Sep 17 00:00:00 2001
From: Andrew Waterman <waterman@eecs.berkeley.edu>
Date: Fri, 9 May 2014 19:09:26 -0700
Subject: [PATCH] Reduce node count by avoiding elsewhen :-(

---
 rocket/src/main/scala/btb.scala | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/rocket/src/main/scala/btb.scala b/rocket/src/main/scala/btb.scala
index e7a30221..d1f9f34d 100644
--- a/rocket/src/main/scala/btb.scala
+++ b/rocket/src/main/scala/btb.scala
@@ -150,6 +150,9 @@ class BTB(implicit conf: BTBConfig) extends Module {
     val waddr = Mux(updateHit, update.bits.prediction.bits.entry, nextRepl)
 
     for (i <- 0 until conf.entries) {
+      when ((pageReplEn & (idxPagesOH(i) | tgtPagesOH(i))).orR) {
+        idxValid(i) := false
+      }
       when (waddr === i) {
         idxValid(i) := updateValid
         when (updateTarget) {
@@ -161,8 +164,6 @@ class BTB(implicit conf: BTBConfig) extends Module {
           useRAS(i) := update.bits.isReturn
           isJump(i) := update.bits.isJump
         }
-      }.elsewhen ((pageReplEn & (idxPagesOH(i) | tgtPagesOH(i))).orR) {
-        idxValid(i) := false
       }
     }