diff options
Diffstat (limited to 'lib/CodeGen/MachineScheduler.cpp')
| -rw-r--r-- | lib/CodeGen/MachineScheduler.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/CodeGen/MachineScheduler.cpp b/lib/CodeGen/MachineScheduler.cpp index 207d65a6b9..659b5ca3e2 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 |