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 @@
// 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