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://review.tizen.org/git/?a=commitdiff_plain;h=f378617773fecebebdf2eeeb7e0fae04e38b60cf;p=platform%2Fupstream%2Fllvm.git

misched: copy comments so compareRPDelta is readable by itself.

llvm-svn: 157424
---

diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp
index 207d65a6..659b5ca 100644
--- a/llvm/lib/CodeGen/MachineScheduler.cpp
+++ b/llvm/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