public:
static char ID; // Pass identification, replacement for typeid
- LowerSubregsInstructionPass() : MachineFunctionPass(&ID) {}
+ LowerSubregsInstructionPass() : MachineFunctionPass(ID) {}
const char *getPassName() const {
return "Subregister lowering instruction pass";
bool runOnMachineFunction(MachineFunction&);
private:
- bool LowerExtract(MachineInstr *MI);
bool LowerSubregToReg(MachineInstr *MI);
bool LowerCopy(MachineInstr *MI);
void TransferDeadFlag(MachineInstr *MI, unsigned DstReg,
const TargetRegisterInfo *TRI);
- void TransferKillFlag(MachineInstr *MI, unsigned SrcReg,
- const TargetRegisterInfo *TRI,
- bool AddIfNotFound = false);
void TransferImplicitDefs(MachineInstr *MI);
};
}
}
-/// TransferKillFlag - MI is a pseudo-instruction with SrcReg killed,
-/// and the lowered replacement instructions immediately precede it.
-/// Mark the replacement instructions with the kill flag.
-void
-LowerSubregsInstructionPass::TransferKillFlag(MachineInstr *MI,
- unsigned SrcReg,
- const TargetRegisterInfo *TRI,
- bool AddIfNotFound) {
- for (MachineBasicBlock::iterator MII =
- prior(MachineBasicBlock::iterator(MI)); ; --MII) {
- if (MII->addRegisterKilled(SrcReg, TRI, AddIfNotFound))
- break;
- assert(MII != MI->getParent()->begin() &&
- "copyPhysReg output doesn't reference source register!");
- }
-}
-
/// TransferImplicitDefs - MI is a pseudo-instruction, and the lowered
/// replacement instructions immediately precede it. Copy any implicit-def
/// operands from MI to the replacement instruction.
}
}
-bool LowerSubregsInstructionPass::LowerExtract(MachineInstr *MI) {
- MachineBasicBlock *MBB = MI->getParent();
-
- assert(MI->getOperand(0).isReg() && MI->getOperand(0).isDef() &&
- MI->getOperand(1).isReg() && MI->getOperand(1).isUse() &&
- MI->getOperand(2).isImm() && "Malformed extract_subreg");
-
- unsigned DstReg = MI->getOperand(0).getReg();
- unsigned SuperReg = MI->getOperand(1).getReg();
- unsigned SubIdx = MI->getOperand(2).getImm();
- unsigned SrcReg = TRI->getSubReg(SuperReg, SubIdx);
-
- assert(TargetRegisterInfo::isPhysicalRegister(SuperReg) &&
- "Extract supperg source must be a physical register");
- assert(TargetRegisterInfo::isPhysicalRegister(DstReg) &&
- "Extract destination must be in a physical register");
- assert(SrcReg && "invalid subregister index for register");
-
- DEBUG(dbgs() << "subreg: CONVERTING: " << *MI);
-
- if (SrcReg == DstReg) {
- // No need to insert an identity copy instruction.
- if (MI->getOperand(1).isKill()) {
- // We must make sure the super-register gets killed. Replace the
- // instruction with KILL.
- MI->setDesc(TII->get(TargetOpcode::KILL));
- MI->RemoveOperand(2); // SubIdx
- DEBUG(dbgs() << "subreg: replace by: " << *MI);
- return true;
- }
-
- DEBUG(dbgs() << "subreg: eliminated!");
- } else {
- TII->copyPhysReg(*MBB, MI, MI->getDebugLoc(), DstReg, SrcReg, false);
- // Transfer the kill/dead flags, if needed.
- if (MI->getOperand(0).isDead())
- TransferDeadFlag(MI, DstReg, TRI);
- if (MI->getOperand(1).isKill())
- TransferKillFlag(MI, SuperReg, TRI, true);
- TransferImplicitDefs(MI);
- DEBUG({
- MachineBasicBlock::iterator dMI = MI;
- dbgs() << "subreg: " << *(--dMI);
- });
- }
-
- DEBUG(dbgs() << '\n');
- MBB->erase(MI);
- return true;
-}
-
bool LowerSubregsInstructionPass::LowerSubregToReg(MachineInstr *MI) {
MachineBasicBlock *MBB = MI->getParent();
assert((MI->getOperand(0).isReg() && MI->getOperand(0).isDef()) &&
MachineBasicBlock::iterator nmi = llvm::next(mi);
MachineInstr *MI = mi;
assert(!MI->isInsertSubreg() && "INSERT_SUBREG should no longer appear");
- if (MI->isExtractSubreg()) {
- MadeChange |= LowerExtract(MI);
- } else if (MI->isSubregToReg()) {
+ assert(MI->getOpcode() != TargetOpcode::EXTRACT_SUBREG &&
+ "EXTRACT_SUBREG should no longer appear");
+ if (MI->isSubregToReg()) {
MadeChange |= LowerSubregToReg(MI);
} else if (MI->isCopy()) {
MadeChange |= LowerCopy(MI);