Move some functionality for adding flags to MachineInstr's into methods on MachineInstr rather than LiveVariables.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46295 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 6d7f729..757b3bd 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -623,3 +623,93 @@
OS << "\n";
}
+bool MachineInstr::addRegisterKilled(unsigned IncomingReg,
+ const MRegisterInfo *RegInfo,
+ bool AddIfNotFound) {
+ bool Found = false;
+ for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
+ MachineOperand &MO = getOperand(i);
+ if (MO.isRegister() && MO.isUse()) {
+ unsigned Reg = MO.getReg();
+ if (!Reg)
+ continue;
+ if (Reg == IncomingReg) {
+ MO.setIsKill();
+ Found = true;
+ break;
+ } else if (MRegisterInfo::isPhysicalRegister(Reg) &&
+ MRegisterInfo::isPhysicalRegister(IncomingReg) &&
+ RegInfo->isSuperRegister(IncomingReg, Reg) &&
+ MO.isKill())
+ // A super-register kill already exists.
+ Found = true;
+ }
+ }
+
+ // If not found, this means an alias of one of the operand is killed. Add a
+ // new implicit operand if required.
+ if (!Found && AddIfNotFound) {
+ addOperand(MachineOperand::CreateReg(IncomingReg, false/*IsDef*/,
+ true/*IsImp*/,true/*IsKill*/));
+ return true;
+ }
+ return Found;
+}
+
+bool MachineInstr::addRegisterDead(unsigned IncomingReg,
+ const MRegisterInfo *RegInfo,
+ bool AddIfNotFound) {
+ bool Found = false;
+ for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
+ MachineOperand &MO = getOperand(i);
+ if (MO.isRegister() && MO.isDef()) {
+ unsigned Reg = MO.getReg();
+ if (!Reg)
+ continue;
+ if (Reg == IncomingReg) {
+ MO.setIsDead();
+ Found = true;
+ break;
+ } else if (MRegisterInfo::isPhysicalRegister(Reg) &&
+ MRegisterInfo::isPhysicalRegister(IncomingReg) &&
+ RegInfo->isSuperRegister(IncomingReg, Reg) &&
+ MO.isDead())
+ // There exists a super-register that's marked dead.
+ return true;
+ }
+ }
+
+ // If not found, this means an alias of one of the operand is dead. Add a
+ // new implicit operand.
+ if (!Found && AddIfNotFound) {
+ addOperand(MachineOperand::CreateReg(IncomingReg, true/*IsDef*/,
+ true/*IsImp*/,false/*IsKill*/,
+ true/*IsDead*/));
+ return true;
+ }
+ return Found;
+}
+
+/// copyKillDeadInfo - copies killed/dead information from one instr to another
+void MachineInstr::copyKillDeadInfo(MachineInstr *OldMI,
+ const MRegisterInfo *RegInfo) {
+ // If the instruction defines any virtual registers, update the VarInfo,
+ // kill and dead information for the instruction.
+ for (unsigned i = 0, e = OldMI->getNumOperands(); i != e; ++i) {
+ MachineOperand &MO = OldMI->getOperand(i);
+ if (MO.isRegister() && MO.getReg() &&
+ MRegisterInfo::isVirtualRegister(MO.getReg())) {
+ unsigned Reg = MO.getReg();
+ if (MO.isDef()) {
+ if (MO.isDead()) {
+ MO.setIsDead(false);
+ addRegisterDead(Reg, RegInfo);
+ }
+ }
+ if (MO.isKill()) {
+ MO.setIsKill(false);
+ addRegisterKilled(Reg, RegInfo);
+ }
+ }
+ }
+}