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Split DAE::MarkLive into MarkLive and PropagateLiveness.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53600 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -134,6 +134,7 @@ namespace {
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const UseVector &MaybeLiveUses);
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void MarkLive(const RetOrArg &RA);
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void MarkLive(const Function &F);
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void PropagateLiveness(const RetOrArg &RA);
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bool RemoveDeadStuffFromFunction(Function *F);
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bool DeleteDeadVarargs(Function &Fn);
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};
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@ -545,7 +546,12 @@ void DAE::MarkLive(const RetOrArg &RA) {
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return; // We were already marked Live.
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DOUT << "DAE - Marking " << RA.getDescription() << " live\n";
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PropagateLiveness(RA);
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}
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/// PropagateLiveness - Given that RA is a live value, propagate it's liveness
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/// to any other values it uses (according to Uses).
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void DAE::PropagateLiveness(const RetOrArg &RA) {
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// We don't use upper_bound (or equal_range) here, because our recursive call
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// to ourselves is likely to cause the upper_bound (which is the first value
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// not belonging to RA) to become erased and the iterator invalidated.
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