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Fix miscomputation of live intervals. The catch is that registers can
be dead at the defining instruction but can only be killed in subsequent ones. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10833 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -196,6 +196,21 @@ void LiveIntervals::handlePhysicalRegisterDef(MachineBasicBlock* mbb,
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unsigned start = getInstructionIndex(*mi);
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unsigned end = start;
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// register can be dead by the instruction defining it but it can
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// only be killed by subsequent instructions
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for (LiveVariables::killed_iterator
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ki = lv_->dead_begin(*mi),
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ke = lv_->dead_end(*mi);
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ki != ke; ++ki) {
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if (reg == ki->second) {
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end = getInstructionIndex(ki->first) + 1;
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DEBUG(std::cerr << " dead\n");
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goto exit;
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}
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}
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++mi;
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for (MachineBasicBlock::iterator e = mbb->end(); mi != e; ++mi) {
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for (LiveVariables::killed_iterator
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ki = lv_->dead_begin(*mi),
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@ -203,6 +218,7 @@ void LiveIntervals::handlePhysicalRegisterDef(MachineBasicBlock* mbb,
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ki != ke; ++ki) {
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if (reg == ki->second) {
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end = getInstructionIndex(ki->first) + 1;
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DEBUG(std::cerr << " dead\n");
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goto exit;
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}
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}
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@ -213,6 +229,7 @@ void LiveIntervals::handlePhysicalRegisterDef(MachineBasicBlock* mbb,
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ki != ke; ++ki) {
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if (reg == ki->second) {
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end = getInstructionIndex(ki->first) + 1;
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DEBUG(std::cerr << " killed\n");
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goto exit;
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}
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}
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