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Avoid adding duplicate function live-in's.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104560 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -293,6 +293,10 @@ public:
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/// corresponding live-in physical register.
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unsigned getLiveInPhysReg(unsigned VReg) const;
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/// getLiveInVirtReg - If PReg is a live-in physical register, return the
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/// corresponding live-in physical register.
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unsigned getLiveInVirtReg(unsigned PReg) const;
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/// EmitLiveInCopies - Emit copies to initialize livein virtual registers
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/// into the given entry block.
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void EmitLiveInCopies(MachineBasicBlock *EntryMBB,
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@ -398,8 +398,14 @@ void MachineFunction::viewCFGOnly() const
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unsigned MachineFunction::addLiveIn(unsigned PReg,
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const TargetRegisterClass *RC) {
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assert(RC->contains(PReg) && "Not the correct regclass!");
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unsigned VReg = getRegInfo().createVirtualRegister(RC);
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getRegInfo().addLiveIn(PReg, VReg);
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MachineRegisterInfo &MRI = getRegInfo();
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unsigned VReg = MRI.getLiveInVirtReg(PReg);
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if (VReg) {
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assert(MRI.getRegClass(VReg) == RC && "Register class mismatch!");
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return VReg;
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}
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VReg = MRI.createVirtualRegister(RC);
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MRI.addLiveIn(PReg, VReg);
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return VReg;
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}
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@ -165,6 +165,15 @@ unsigned MachineRegisterInfo::getLiveInPhysReg(unsigned VReg) const {
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return 0;
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}
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/// getLiveInVirtReg - If PReg is a live-in physical register, return the
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/// corresponding live-in physical register.
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unsigned MachineRegisterInfo::getLiveInVirtReg(unsigned PReg) const {
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for (livein_iterator I = livein_begin(), E = livein_end(); I != E; ++I)
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if (I->first == PReg)
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return I->second;
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return 0;
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}
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static cl::opt<bool>
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SchedLiveInCopies("schedule-livein-copies", cl::Hidden,
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cl::desc("Schedule copies of livein registers"),
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