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Keep track of the number of positively biased nodes when adding constraints.

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If there are no positive nodes, the algorithm can be aborted early.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129021 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-04-06 19:14:00 +00:00
parent 9efa2a263e
commit 70d4370b47
3 changed files with 16 additions and 3 deletions
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lib/CodeGen/RegAllocGreedy.cpp
+1
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@@ -772,6 +772,7 @@ unsigned RAGreedy::tryRegionSplit(LiveInterval &VirtReg, AllocationOrder &Order,
SpillPlacer->prepare(LiveBundles);
SpillPlacer->addConstraints(SplitConstraints);
DEBUG(dbgs() << ", " << SpillPlacer->getPositiveNodes() << " biased nodes");
SpillPlacer->finish();
// No live bundles, defer to splitSingleBlocks().