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MI Sched: revert a minor heuristic that snuck in with -misched-vcopy.

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I'll fix the heuristic in a general way in a follow-up commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180815 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2013-04-30 22:10:59 +00:00
parent 13ec4812fc
commit f13fc1b23a
1 changed files with 6 additions and 0 deletions
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6
lib/CodeGen/MachineScheduler.cpp
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@ -1990,9 +1990,15 @@ void ConvergingScheduler::tryCandidate(SchedCandidate &Cand,
return; return;
// Weak edges are for clustering and other constraints. // Weak edges are for clustering and other constraints.
//
// Deferring TryCand here does not change Cand's reason. This is good in the
// sense that a bad candidate shouldn't affect a previous candidate's
// goodness, but bad in that it is assymetric and depends on queue order.
CandReason OrigReason = Cand.Reason;
if (tryLess(getWeakLeft(TryCand.SU, Zone.isTop()), if (tryLess(getWeakLeft(TryCand.SU, Zone.isTop()),
getWeakLeft(Cand.SU, Zone.isTop()), getWeakLeft(Cand.SU, Zone.isTop()),
TryCand, Cand, Weak)) { TryCand, Cand, Weak)) {
Cand.Reason = OrigReason;
return; return;
} }
// Avoid critical resource consumption and balance the schedule. // Avoid critical resource consumption and balance the schedule.