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* Fix incorrect computation of the runOnMachineFunction return value

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* Turn a bunch of instance variables into automatic variables

llvm-svn: 11035
This commit is contained in:
Chris Lattner 2004-01-31 21:14:04 +00:00
parent b0addcc1b0
commit 05b7fef02f
1 changed files with 23 additions and 30 deletions
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53
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -43,18 +43,10 @@ namespace {
Statistic<> numInstrsAdded("twoaddressinstruction",
"Number of instructions added");
class TwoAddressInstructionPass : public MachineFunctionPass
struct TwoAddressInstructionPass : public MachineFunctionPass
{
private:
MachineFunction* mf_;
const TargetMachine* tm_;
const MRegisterInfo* mri_;
LiveVariables* lv_;
public:
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
private:
/// runOnMachineFunction - pass entry point
bool runOnMachineFunction(MachineFunction&);
};
@ -75,31 +67,32 @@ void TwoAddressInstructionPass::getAnalysisUsage(AnalysisUsage &AU) const
}
/// runOnMachineFunction - Reduce two-address instructions to two
/// operands
/// operands.
///
bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &fn) {
bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
DEBUG(std::cerr << "Machine Function\n");
mf_ = &fn;
tm_ = &fn.getTarget();
mri_ = tm_->getRegisterInfo();
lv_ = &getAnalysis<LiveVariables>();
const TargetMachine &TM = MF.getTarget();
const MRegisterInfo &MRI = *TM.getRegisterInfo();
LiveVariables &LV = getAnalysis<LiveVariables>();
const TargetInstrInfo &TII = TM.getInstrInfo();
const TargetInstrInfo& tii = tm_->getInstrInfo();
bool MadeChange = false;
for (MachineFunction::iterator mbbi = mf_->begin(), mbbe = mf_->end();
for (MachineFunction::iterator mbbi = MF.begin(), mbbe = MF.end();
mbbi != mbbe; ++mbbi) {
for (MachineBasicBlock::iterator mii = mbbi->begin();
mii != mbbi->end(); ++mii) {
MachineInstr* mi = *mii;
unsigned opcode = mi->getOpcode();
// ignore if it is not a two-address instruction
if (!tii.isTwoAddrInstr(opcode))
if (!TII.isTwoAddrInstr(opcode))
continue;
++numTwoAddressInstrs;
MadeChange = true;
DEBUG(std::cerr << "\tinstruction: "; mi->print(std::cerr, *tm_));
DEBUG(std::cerr << "\tinstruction: "; mi->print(std::cerr, TM));
// we have nothing to do if the two operands are the same
if (mi->getOperand(0).getAllocatedRegNum() ==
@ -133,23 +126,23 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &fn) {
}
const TargetRegisterClass* rc =
mf_->getSSARegMap()->getRegClass(regA);
numInstrsAdded += mri_->copyRegToReg(*mbbi, mii, regA, regB, rc);
MF.getSSARegMap()->getRegClass(regA);
numInstrsAdded += MRI.copyRegToReg(*mbbi, mii, regA, regB, rc);
MachineInstr* prevMi = *(mii - 1);
DEBUG(std::cerr << "\t\tadded instruction: ";
prevMi->print(std::cerr, *tm_));
prevMi->print(std::cerr, TM));
// update live variables for regA
LiveVariables::VarInfo& varInfo = lv_->getVarInfo(regA);
LiveVariables::VarInfo& varInfo = LV.getVarInfo(regA);
varInfo.DefInst = prevMi;
// update live variables for regB
if (lv_->removeVirtualRegisterKilled(regB, &*mbbi, mi))
lv_->addVirtualRegisterKilled(regB, &*mbbi, prevMi);
if (LV.removeVirtualRegisterKilled(regB, &*mbbi, mi))
LV.addVirtualRegisterKilled(regB, &*mbbi, prevMi);
if (lv_->removeVirtualRegisterDead(regB, &*mbbi, mi))
lv_->addVirtualRegisterDead(regB, &*mbbi, prevMi);
if (LV.removeVirtualRegisterDead(regB, &*mbbi, mi))
LV.addVirtualRegisterDead(regB, &*mbbi, prevMi);
// replace all occurences of regB with regA
for (unsigned i = 1; i < mi->getNumOperands(); ++i) {
@ -158,11 +151,11 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &fn) {
mi->SetMachineOperandReg(i, regA);
}
DEBUG(std::cerr << "\t\tmodified original to: ";
mi->print(std::cerr, *tm_));
mi->print(std::cerr, TM));
assert(mi->getOperand(0).getAllocatedRegNum() ==
mi->getOperand(1).getAllocatedRegNum());
}
}
return numInstrsAdded != 0;
return MadeChange;
}