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- Add LiveVariables::replaceKillInstruction. This does a subset of instructionChanged. That is, it only update the VarInfo.kills if the new instruction is known to have the correct dead and kill markers.
- CommuteInstruction copies kill / dead markers over to new instruction. So use replaceKillInstruction instead. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53061 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -189,6 +189,11 @@ public:
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/// the records for NewMI.
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void instructionChanged(MachineInstr *OldMI, MachineInstr *NewMI);
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/// replaceKillInstruction - Update register kill info by replacing a kill
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/// instruction with a new one.
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void replaceKillInstruction(unsigned Reg, MachineInstr *OldMI,
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MachineInstr *NewMI);
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/// addVirtualRegisterKilled - Add information about the fact that the
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/// specified register is killed after being used by the specified
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/// instruction. If AddIfNotFound is true, add a implicit operand if it's
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@ -684,6 +684,15 @@ void LiveVariables::instructionChanged(MachineInstr *OldMI,
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}
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}
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/// replaceKillInstruction - Update register kill info by replacing a kill
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/// instruction with a new one.
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void LiveVariables::replaceKillInstruction(unsigned Reg, MachineInstr *OldMI,
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MachineInstr *NewMI) {
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VarInfo &VI = getVarInfo(Reg);
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if (VI.removeKill(OldMI))
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VI.Kills.push_back(NewMI); // Yes, there was a kill of it
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}
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/// removeVirtualRegistersKilled - Remove all killed info for the specified
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/// instruction.
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void LiveVariables::removeVirtualRegistersKilled(MachineInstr *MI) {
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@ -375,10 +375,9 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
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DOUT << "2addr: COMMUTED TO: " << *NewMI;
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// If the instruction changed to commute it, update livevar.
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if (NewMI != mi) {
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if (LV) {
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if (LV)
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// Update live variables
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LV->instructionChanged(mi, NewMI);
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}
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LV->replaceKillInstruction(regC, mi, NewMI);
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mbbi->insert(mi, NewMI); // Insert the new inst
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mbbi->erase(mi); // Nuke the old inst.
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