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Refactor code. No functionality change. 

llvm-svn: 62893
This commit is contained in:
Evan Cheng 2009-01-23 23:27:33 +00:00
parent ccfacfff9a
commit 6d8970695b
1 changed files with 38 additions and 20 deletions
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58
llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -69,6 +69,11 @@ namespace {
MachineInstr *MI, MachineInstr *DefMI,
MachineBasicBlock *MBB, unsigned Loc,
DenseMap<MachineInstr*, unsigned> &DistanceMap);
bool CommuteInstruction(MachineBasicBlock::iterator &mi,
MachineFunction::iterator &mbbi,
unsigned RegC, unsigned Dist,
DenseMap<MachineInstr*, unsigned> &DistanceMap);
public:
static char ID; // Pass identification, replacement for typeid
TwoAddressInstructionPass() : MachineFunctionPass(&ID) {}
@ -250,6 +255,38 @@ TwoAddressInstructionPass::isProfitableToReMat(unsigned Reg,
return MBB == DefMI->getParent();
}
/// CommuteInstruction - Commute a two-address instruction and update the basic
/// block, distance map, and live variables if needed. Return true if it is
/// successful.
bool
TwoAddressInstructionPass::CommuteInstruction(MachineBasicBlock::iterator &mi,
MachineFunction::iterator &mbbi,
unsigned RegC, unsigned Dist,
DenseMap<MachineInstr*, unsigned> &DistanceMap) {
MachineInstr *MI = mi;
DOUT << "2addr: COMMUTING : " << *MI;
MachineInstr *NewMI = TII->commuteInstruction(MI);
if (NewMI == 0) {
DOUT << "2addr: COMMUTING FAILED!\n";
return false;
}
DOUT << "2addr: COMMUTED TO: " << *NewMI;
// If the instruction changed to commute it, update livevar.
if (NewMI != MI) {
if (LV)
// Update live variables
LV->replaceKillInstruction(RegC, MI, NewMI);
mbbi->insert(mi, NewMI); // Insert the new inst
mbbi->erase(mi); // Nuke the old inst.
mi = NewMI;
DistanceMap.insert(std::make_pair(NewMI, Dist));
}
return true;
}
/// runOnMachineFunction - Reduce two-address instructions to two operands.
///
bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
@ -337,27 +374,8 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
assert(mi->getOperand(3-si).isReg() &&
"Not a proper commutative instruction!");
unsigned regC = mi->getOperand(3-si).getReg();
if (mi->killsRegister(regC)) {
DOUT << "2addr: COMMUTING : " << *mi;
MachineInstr *NewMI = TII->commuteInstruction(mi);
if (NewMI == 0) {
DOUT << "2addr: COMMUTING FAILED!\n";
} else {
DOUT << "2addr: COMMUTED TO: " << *NewMI;
// If the instruction changed to commute it, update livevar.
if (NewMI != mi) {
if (LV)
// Update live variables
LV->replaceKillInstruction(regC, mi, NewMI);
mbbi->insert(mi, NewMI); // Insert the new inst
mbbi->erase(mi); // Nuke the old inst.
mi = NewMI;
DistanceMap.insert(std::make_pair(NewMI, Dist));
}
if (CommuteInstruction(mi, mbbi, regC, Dist, DistanceMap)) {
++NumCommuted;
regB = regC;
goto InstructionRearranged;