From: Andrew Trick <atrick@apple.com>
Date: Thu, 24 May 2012 22:11:01 +0000 (+0000)
Subject: misched: copy comments so compareRPDelta is readable by itself.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=c8fe4ecb47644e76f5e38b8b75997912554a24a3;p=oota-llvm.git

misched: copy comments so compareRPDelta is readable by itself.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157424 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/MachineScheduler.cpp b/lib/CodeGen/MachineScheduler.cpp
index 207d65a6b94..659b5ca3e25 100644
--- a/lib/CodeGen/MachineScheduler.cpp
+++ b/lib/CodeGen/MachineScheduler.cpp
@@ -815,19 +815,22 @@ static bool compareRPDelta(const RegPressureDelta &LHS,
   // Compare each component of pressure in decreasing order of importance
   // without checking if any are valid. Invalid PressureElements are assumed to
   // have UnitIncrease==0, so are neutral.
+
+  // Avoid increasing the max critical pressure in the scheduled region.
   if (LHS.Excess.UnitIncrease != RHS.Excess.UnitIncrease)
     return LHS.Excess.UnitIncrease < RHS.Excess.UnitIncrease;
 
+  // Avoid increasing the max critical pressure in the scheduled region.
   if (LHS.CriticalMax.UnitIncrease != RHS.CriticalMax.UnitIncrease)
     return LHS.CriticalMax.UnitIncrease < RHS.CriticalMax.UnitIncrease;
 
+  // Avoid increasing the max pressure of the entire region.
   if (LHS.CurrentMax.UnitIncrease != RHS.CurrentMax.UnitIncrease)
     return LHS.CurrentMax.UnitIncrease < RHS.CurrentMax.UnitIncrease;
 
   return false;
 }
 
-
 /// Pick the best candidate from the top queue.
 ///
 /// TODO: getMaxPressureDelta results can be mostly cached for each SUnit during