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misched: copy comments so compareRPDelta is readable by itself.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157424 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2012-05-24 22:11:01 +00:00
parent 5f887fab35
commit c8fe4ecb47
1 changed files with 4 additions and 1 deletions
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5
lib/CodeGen/MachineScheduler.cpp
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@ -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