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[PBQP] Fix coalescing benefits

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As coalescing registers is a benefit, the cost should be improved (i.e. made smaller) when coalescing is possible.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220302 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnaud A. de Grandmaison 2014-10-21 16:24:15 +00:00
parent c65b578e25
commit a5d0ebdbc2
1 changed files with 2 additions and 2 deletions
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4
lib/CodeGen/RegAllocPBQP.cpp
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@ -350,7 +350,7 @@ public:
if (PRegOpt < Allowed.size()) {
PBQPRAGraph::RawVector NewCosts(G.getNodeCosts(NId));
NewCosts[PRegOpt + 1] += CBenefit;
NewCosts[PRegOpt + 1] -= CBenefit;
G.setNodeCosts(NId, std::move(NewCosts));
}
} else {
@ -395,7 +395,7 @@ private:
for (unsigned J = 0; J != Allowed2.size(); ++J) {
unsigned PReg2 = Allowed2[J];
if (PReg1 == PReg2)
CostMat[I + 1][J + 1] += -Benefit;
CostMat[I + 1][J + 1] -= Benefit;
}
}
}