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This pass should not require phi elimination or live variable

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analysis. It should only preserve them and update LiveVariables if it
already ran.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11479 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos 2004-02-15 21:50:32 +00:00
parent 5aaf1d2820
commit f11800b718
1 changed files with 13 additions and 13 deletions
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26
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -65,9 +65,7 @@ const PassInfo *llvm::TwoAddressInstructionPassID = X.getPassInfo();
void TwoAddressInstructionPass::getAnalysisUsage(AnalysisUsage &AU) const void TwoAddressInstructionPass::getAnalysisUsage(AnalysisUsage &AU) const
{ {
AU.addPreserved<LiveVariables>(); AU.addPreserved<LiveVariables>();
AU.addRequired<LiveVariables>();
AU.addPreservedID(PHIEliminationID); AU.addPreservedID(PHIEliminationID);
AU.addRequiredID(PHIEliminationID);
MachineFunctionPass::getAnalysisUsage(AU); MachineFunctionPass::getAnalysisUsage(AU);
} }
@ -79,7 +77,7 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
const TargetMachine &TM = MF.getTarget(); const TargetMachine &TM = MF.getTarget();
const MRegisterInfo &MRI = *TM.getRegisterInfo(); const MRegisterInfo &MRI = *TM.getRegisterInfo();
const TargetInstrInfo &TII = TM.getInstrInfo(); const TargetInstrInfo &TII = TM.getInstrInfo();
LiveVariables &LV = getAnalysis<LiveVariables>(); LiveVariables* LV = getAnalysisToUpdate<LiveVariables>();
bool MadeChange = false; bool MadeChange = false;
@ -139,18 +137,20 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
DEBUG(std::cerr << "\t\tadded instruction: "; DEBUG(std::cerr << "\t\tadded instruction: ";
prevMi->print(std::cerr, TM)); prevMi->print(std::cerr, TM));
// update live variables for regA if (LV) {
assert(Added == 1 && // update live variables for regA
"Cannot handle multi-instruction copies yet!"); assert(Added == 1 &&
LiveVariables::VarInfo& varInfo = LV.getVarInfo(regA); "Cannot handle multi-instruction copies yet!");
varInfo.DefInst = prevMi; LiveVariables::VarInfo& varInfo = LV->getVarInfo(regA);
varInfo.DefInst = prevMi;
// update live variables for regB // update live variables for regB
if (LV.removeVirtualRegisterKilled(regB, &*mbbi, mi)) if (LV->removeVirtualRegisterKilled(regB, &*mbbi, mi))
LV.addVirtualRegisterKilled(regB, &*mbbi, prevMi); LV->addVirtualRegisterKilled(regB, &*mbbi, prevMi);
if (LV.removeVirtualRegisterDead(regB, &*mbbi, mi)) if (LV->removeVirtualRegisterDead(regB, &*mbbi, mi))
LV.addVirtualRegisterDead(regB, &*mbbi, prevMi); LV->addVirtualRegisterDead(regB, &*mbbi, prevMi);
}
// replace all occurences of regB with regA // replace all occurences of regB with regA
for (unsigned i = 1, e = mi->getNumOperands(); i != e; ++i) { for (unsigned i = 1, e = mi->getNumOperands(); i != e; ++i) {