From a80c859df377908c687d59e9c0fc65006796b719 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Mon, 5 Jan 2009 22:40:26 +0000
Subject: [PATCH] Don't call setDepthDirty/setHeightDirty when adding an edge
 with latency 0, since it doesn't affect the depth or height.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61762 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/ScheduleDAG.cpp | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/lib/CodeGen/ScheduleDAG.cpp b/lib/CodeGen/ScheduleDAG.cpp
index c2d291dadd3..730080d0fa4 100644
--- a/lib/CodeGen/ScheduleDAG.cpp
+++ b/lib/CodeGen/ScheduleDAG.cpp
@@ -77,8 +77,10 @@ void SUnit::addPred(const SDep &D) {
     ++N->NumSuccsLeft;
   N->Succs.push_back(P);
   Preds.push_back(D);
-  this->setDepthDirty();
-  N->setHeightDirty();
+  if (P.getLatency() != 0) {
+    this->setDepthDirty();
+    N->setHeightDirty();
+  }
 }
 
 /// removePred - This removes the specified edge as a pred of the current
@@ -112,8 +114,10 @@ void SUnit::removePred(const SDep &D) {
         --NumPredsLeft;
       if (!isScheduled)
         --N->NumSuccsLeft;
-      this->setDepthDirty();
-      N->setHeightDirty();
+      if (P.getLatency() != 0) {
+        this->setDepthDirty();
+        N->setHeightDirty();
+      }
       return;
     }
 }
-- 
2.34.1