From 071966f6bf2a535b318995cfa5d0f5b641fb4e14 Mon Sep 17 00:00:00 2001
From: Andrew Trick <atrick@apple.com>
Date: Tue, 18 Dec 2012 20:52:49 +0000
Subject: [PATCH] MISched: minor improvement, initialize remaining resources
 before the first scheduling decision.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170449 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/MachineScheduler.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/CodeGen/MachineScheduler.cpp b/lib/CodeGen/MachineScheduler.cpp
index c7afa08fcde..d49eda24a70 100644
--- a/lib/CodeGen/MachineScheduler.cpp
+++ b/lib/CodeGen/MachineScheduler.cpp
@@ -1166,6 +1166,16 @@ init(ScheduleDAGMI *DAG, const TargetSchedModel *SchedModel) {
       RemainingCounts[PIdx] += (Factor * PI->Cycles);
     }
   }
+  for (unsigned PIdx = 0, PEnd = SchedModel->getNumProcResourceKinds();
+       PIdx != PEnd; ++PIdx) {
+    if ((int)(RemainingCounts[PIdx] - RemainingCounts[CritResIdx])
+        >= (int)SchedModel->getLatencyFactor()) {
+      CritResIdx = PIdx;
+    }
+  }
+  MaxRemainingCount = std::max(
+    RemainingMicroOps * SchedModel->getMicroOpFactor(),
+    RemainingCounts[CritResIdx]);
 }
 
 void ConvergingScheduler::SchedBoundary::