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A value defined by an implicit_def can be liven to a use BB. This is unfortunate. But register allocator still has to add it to the live-in set of the use BB.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72889 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -542,6 +542,24 @@ void RALinScan::linearScan()
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// Ignore splited live intervals.
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if (!isPhys && vrm_->getPreSplitReg(cur.reg))
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continue;
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// A register defined by an implicit_def can be liveout the def BB and livein
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// to a use BB. Add it to the livein set of the use BB's.
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if (!isPhys && cur.empty()) {
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if (MachineInstr *DefMI = mri_->getVRegDef(cur.reg)) {
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assert(DefMI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF);
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MachineBasicBlock *DefMBB = DefMI->getParent();
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SmallPtrSet<MachineBasicBlock*, 4> Seen;
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Seen.insert(DefMBB);
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for (MachineRegisterInfo::reg_iterator ri = mri_->reg_begin(cur.reg),
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re = mri_->reg_end(); ri != re; ++ri) {
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MachineInstr *UseMI = &*ri;
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MachineBasicBlock *UseMBB = UseMI->getParent();
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if (Seen.insert(UseMBB))
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UseMBB->addLiveIn(Reg);
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}
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}
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}
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for (LiveInterval::Ranges::const_iterator I = cur.begin(), E = cur.end();
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I != E; ++I) {
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const LiveRange &LR = *I;
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