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Avoid spilling stack slots... to stack slots.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23478 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -334,6 +334,12 @@ splitLiveRangesLiveAcrossInvokes(std::vector<InvokeInst*> &Invokes) {
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cast<Instruction>(Inst->use_back())->getParent() == BB &&
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!isa<PHINode>(Inst->use_back())) continue;
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// If this is an alloca in the entry block, it's not a real register
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// value.
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if (AllocaInst *AI = dyn_cast<AllocaInst>(Inst))
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if (isa<ConstantInt>(AI->getArraySize()) && BB == F->begin())
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continue;
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// Avoid iterator invalidation by copying users to a temporary vector.
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std::vector<Instruction*> Users;
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for (Value::use_iterator UI = Inst->use_begin(), E = Inst->use_end();
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