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When a variable is killed and redifined in a basic block only one
killing instruction is tracked. This causes the LiveIntervals to create bogus intervals. The workaound is to add a range to the interval from the redefinition to the end of the basic block. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10510 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -152,11 +152,14 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock* mbb,
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for (int i = 0, e = vi.Kills.size(); i != e; ++i) {
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MachineBasicBlock* killerBlock = vi.Kills[i].first;
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MachineInstr* killerInstr = vi.Kills[i].second;
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killedInDefiningBasicBlock |= mbb == killerBlock;
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unsigned start = (mbb == killerBlock ?
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instrIndex :
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getInstructionIndex(killerBlock->front()));
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unsigned end = getInstructionIndex(killerInstr) + 1;
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if (start < end) {
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killedInDefiningBasicBlock |= mbb == killerBlock;
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interval->addRange(start, end);
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}
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}
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if (!killedInDefiningBasicBlock) {
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