Differential D11817 Diff 33608 lib/Target/PowerPC/PPCEarlyReturn.cpp

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lib/Target/PowerPC/PPCEarlyReturn.cpp

Show First 20 Lines • Show All 65 Lines • ▼ Show 20 Lines	bool processBlock(MachineBasicBlock &ReturnMBB) {
(I->getOpcode() != PPC::BLR && I->getOpcode() != PPC::BLR8) \|\|		(I->getOpcode() != PPC::BLR && I->getOpcode() != PPC::BLR8) \|\|
I != ReturnMBB.getLastNonDebugInstr())		I != ReturnMBB.getLastNonDebugInstr())
return Changed;		return Changed;

SmallVector<MachineBasicBlock*, 8> PredToRemove;		SmallVector<MachineBasicBlock*, 8> PredToRemove;
for (MachineBasicBlock::pred_iterator PI = ReturnMBB.pred_begin(),		for (MachineBasicBlock::pred_iterator PI = ReturnMBB.pred_begin(),
PIE = ReturnMBB.pred_end(); PI != PIE; ++PI) {		PIE = ReturnMBB.pred_end(); PI != PIE; ++PI) {
bool OtherReference = false, BlockChanged = false;		bool OtherReference = false, BlockChanged = false;

		if ((*PI)->empty())
		continue;

for (MachineBasicBlock::iterator J = (*PI)->getLastNonDebugInstr();;) {		for (MachineBasicBlock::iterator J = (*PI)->getLastNonDebugInstr();;) {
		if (J == (*PI)->end())
		break;

MachineInstrBuilder MIB;		MachineInstrBuilder MIB;
if (J->getOpcode() == PPC::B) {		if (J->getOpcode() == PPC::B) {
if (J->getOperand(0).getMBB() == &ReturnMBB) {		if (J->getOperand(0).getMBB() == &ReturnMBB) {
// This is an unconditional branch to the return. Replace the		// This is an unconditional branch to the return. Replace the
// branch with a blr.		// branch with a blr.
MIB =		MIB =
BuildMI(**PI, J, J->getDebugLoc(), TII->get(I->getOpcode()));		BuildMI(**PI, J, J->getDebugLoc(), TII->get(I->getOpcode()));
MIB.copyImplicitOps(I);		MIB.copyImplicitOps(I);
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