From f378617773fecebebdf2eeeb7e0fae04e38b60cf Mon Sep 17 00:00:00 2001 From: Andrew Trick Date: Thu, 24 May 2012 22:11:01 +0000 Subject: [PATCH] misched: copy comments so compareRPDelta is readable by itself. llvm-svn: 157424 --- llvm/lib/CodeGen/MachineScheduler.cpp | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) 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 -- 2.7.4