using namespace llvm;
char ProcessImplicitDefs::ID = 0;
+char &llvm::ProcessImplicitDefsID = ProcessImplicitDefs::ID;
+
INITIALIZE_PASS_BEGIN(ProcessImplicitDefs, "processimpdefs",
"Process Implicit Definitions", false, false)
INITIALIZE_PASS_DEPENDENCY(LiveVariables)
AU.setPreservesCFG();
AU.addPreserved<AliasAnalysis>();
AU.addPreserved<LiveVariables>();
- AU.addRequired<LiveVariables>();
AU.addPreservedID(MachineLoopInfoID);
AU.addPreservedID(MachineDominatorsID);
AU.addPreservedID(TwoAddressInstructionPassID);
TII = fn.getTarget().getInstrInfo();
TRI = fn.getTarget().getRegisterInfo();
MRI = &fn.getRegInfo();
- LV = &getAnalysis<LiveVariables>();
+ LV = getAnalysisIfAvailable<LiveVariables>();
SmallSet<unsigned, 8> ImpDefRegs;
SmallVector<MachineInstr*, 8> ImpDefMIs;
if (MI->isCopy() && MI->getOperand(0).readsReg()) {
MachineOperand &MO = MI->getOperand(1);
if (MO.isUndef() || ImpDefRegs.count(MO.getReg())) {
- if (MO.isKill()) {
+ if (LV && MO.isKill()) {
LiveVariables::VarInfo& vi = LV->getVarInfo(MO.getReg());
vi.removeKill(MI);
}
MI->RemoveOperand(j);
if (isKill) {
ImpDefRegs.erase(Reg);
- LiveVariables::VarInfo& vi = LV->getVarInfo(Reg);
- vi.removeKill(MI);
+ if (LV) {
+ LiveVariables::VarInfo& vi = LV->getVarInfo(Reg);
+ vi.removeKill(MI);
+ }
}
ChangedToImpDef = true;
Changed = true;
}
// Update LiveVariables varinfo if the instruction is a kill.
- if (isKill) {
+ if (LV && isKill) {
LiveVariables::VarInfo& vi = LV->getVarInfo(Reg);
vi.removeKill(RMI);
}