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Fix the case where an instruction is not properly marked as using all registers that alias its inputs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57286 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -575,8 +575,26 @@ void RALocal::ComputeLocalLiveness(MachineBasicBlock& MBB) {
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// them for later. Also, we have to process these
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// _before_ processing the defs, since an instr
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// uses regs before it defs them.
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if (MO.isReg() && MO.getReg() && MO.isUse())
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if (MO.isReg() && MO.getReg() && MO.isUse()) {
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LastUseDef[MO.getReg()] = std::make_pair(I, i);
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if (TargetRegisterInfo::isVirtualRegister(MO.getReg())) continue;
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const unsigned* subregs = TRI->getAliasSet(MO.getReg());
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if (subregs) {
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while (*subregs) {
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DenseMap<unsigned, std::pair<MachineInstr*, unsigned> >::iterator
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alias = LastUseDef.find(*subregs);
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if (alias != LastUseDef.end() &&
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alias->second.first != I)
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LastUseDef[*subregs] = std::make_pair(I, i);
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++subregs;
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}
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}
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}
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}
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for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {
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