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RegisterPressureTracker: reword stale comments.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237544 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2611,8 +2611,7 @@ void GenericScheduler::tryCandidate(SchedCandidate &Cand,
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TryCand, Cand, PhysRegCopy))
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return;
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// Avoid exceeding the target's limit. If signed PSetID is negative, it is
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// invalid; convert it to INT_MAX to give it lowest priority.
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// Avoid exceeding the target's limit.
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if (DAG->isTrackingPressure() && tryPressure(TryCand.RPDelta.Excess,
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Cand.RPDelta.Excess,
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TryCand, Cand, RegExcess))
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@ -750,9 +750,11 @@ void RegPressureTracker::bumpUpwardPressure(const MachineInstr *MI) {
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///
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/// This assumes that the current LiveOut set is sufficient.
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///
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/// FIXME: This is expensive for an on-the-fly query. We need to cache the
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/// result per-SUnit with enough information to adjust for the current
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/// scheduling position. But this works as a proof of concept.
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/// This is expensive for an on-the-fly query because it calls
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/// bumpUpwardPressure to recompute the pressure sets based on current
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/// liveness. This mainly exists to verify correctness, e.g. with
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/// -verify-misched. getUpwardPressureDelta is the fast version of this query
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/// that uses the per-SUnit cache of the PressureDiff.
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void RegPressureTracker::
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getMaxUpwardPressureDelta(const MachineInstr *MI, PressureDiff *PDiff,
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RegPressureDelta &Delta,
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@ -809,10 +811,8 @@ getMaxUpwardPressureDelta(const MachineInstr *MI, PressureDiff *PDiff,
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#endif
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}
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/// This is a prototype of the fast version of querying register pressure that
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/// does not directly depend on current liveness. It's still slow because we
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/// recompute pressure change on-the-fly. This implementation only exists to
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/// prove correctness.
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/// This is the fast version of querying register pressure that does not
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/// directly depend on current liveness.
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///
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/// @param Delta captures information needed for heuristics.
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///
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@ -950,6 +950,11 @@ void RegPressureTracker::bumpDownwardPressure(const MachineInstr *MI) {
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/// register units of that pressure set introduced by this instruction.
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///
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/// This assumes that the current LiveIn set is sufficient.
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///
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/// This is expensive for an on-the-fly query because it calls
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/// bumpDownwardPressure to recompute the pressure sets based on current
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/// liveness. We don't yet have a fast version of downward pressure tracking
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/// analagous to getUpwardPressureDelta.
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void RegPressureTracker::
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getMaxDownwardPressureDelta(const MachineInstr *MI, RegPressureDelta &Delta,
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ArrayRef<PressureChange> CriticalPSets,
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