From: Andrew Trick <atrick@apple.com>
Date: Mon, 17 Jun 2013 21:45:07 +0000 (+0000)
Subject: MI-Sched: Remove another heuristic that is sensitive to queue order.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=07023fef3acd0d17af099f580d8d254e9d45eb87;p=oota-llvm.git

MI-Sched: Remove another heuristic that is sensitive to queue order.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184130 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/MachineScheduler.cpp b/lib/CodeGen/MachineScheduler.cpp
index 5a9c4e45132..55e58969a04 100644
--- a/lib/CodeGen/MachineScheduler.cpp
+++ b/lib/CodeGen/MachineScheduler.cpp
@@ -2113,15 +2113,9 @@ void ConvergingScheduler::tryCandidate(SchedCandidate &Cand,
     return;
 
   // Weak edges are for clustering and other constraints.
-  //
-  // Deferring TryCand here does not change Cand's reason. This is good in the
-  // sense that a bad candidate shouldn't affect a previous candidate's
-  // goodness, but bad in that it is assymetric and depends on queue order.
-  CandReason OrigReason = Cand.Reason;
   if (tryLess(getWeakLeft(TryCand.SU, Zone.isTop()),
               getWeakLeft(Cand.SU, Zone.isTop()),
               TryCand, Cand, Weak)) {
-    Cand.Reason = OrigReason;
     return;
   }
   // Avoid critical resource consumption and balance the schedule.