}
/// findRegisterDefOperandIdx() - Returns the operand index that is a def of
-/// the specific register or -1 if it is not found. It further tightening
- /// the search criteria to a def that is dead the register if isDead is true.
+/// the specified register or -1 if it is not found. If isDead is true, defs
+/// that are not dead are skipped. If TargetRegisterInfo is non-null, then it
+/// also checks if there is a def of a super-register.
int MachineInstr::findRegisterDefOperandIdx(unsigned Reg, bool isDead,
const TargetRegisterInfo *TRI) const {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
}
}
-/// isSafeToMove - Return true if it is safe to this instruction. If SawStore
-/// true, it means there is a store (or call) between the instruction the
-/// localtion and its intended destination.
+/// isSafeToMove - Return true if it is safe to this instruction. If SawStore is
+/// set to true, it means that there is a store (or call) between the
+/// instruction's location and its intended destination.
bool MachineInstr::isSafeToMove(const TargetInstrInfo *TII, bool &SawStore) {
// Ignore stuff that we obviously can't move.
if (TID->mayStore() || TID->isCall()) {
if (getNumMemOperands() > 0) {
OS << ", Mem:";
for (unsigned i = 0; i < getNumMemOperands(); i++) {
- const MemOperand &MRO = getMemOperand(i);
+ const MachineMemOperand &MRO = getMemOperand(i);
const Value *V = MRO.getValue();
assert((MRO.isLoad() || MRO.isStore()) &&
bool MachineInstr::addRegisterKilled(unsigned IncomingReg,
const TargetRegisterInfo *RegInfo,
bool AddIfNotFound) {
- // Go through the machine instruction's operands to eliminate any potentially
- // illegal conditions. I.e., a super- and sub-register both marked "kill".
- for (unsigned i = 0, e = getNumOperands(); i < e;) {
- MachineOperand &MO = getOperand(i);
- if (MO.isRegister() && MO.isUse()) {
- unsigned Reg = MO.getReg();
-
- if (!Reg || IncomingReg == Reg ||
- !TargetRegisterInfo::isPhysicalRegister(Reg) ||
- !TargetRegisterInfo::isPhysicalRegister(IncomingReg)) {
- ++i;
- continue;
- }
-
- if (RegInfo->isSuperRegister(IncomingReg, Reg) && MO.isKill())
- // The kill information is already handled by a super-register. Don't
- // add this sub-register as a kill.
- return true;
-
- if (RegInfo->isSubRegister(IncomingReg, Reg) && MO.isKill()) {
- if (MO.isImplicit()) {
- // Remove this implicit use that marks the sub-register
- // "kill". Let the super-register take care of this
- // information.
- RemoveOperand(i);
- --e;
- continue;
- } else {
- // The super-register is going to take care of this kill
- // information.
- MO.setIsKill(false);
- }
- }
- }
-
- ++i;
- }
-
- // If the register already exists, then make sure it or its super-register is
- // marked "kill".
+ bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(IncomingReg);
+ bool Found = false;
+ SmallVector<unsigned,4> DeadOps;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
MachineOperand &MO = getOperand(i);
+ if (!MO.isRegister() || !MO.isUse())
+ continue;
+ unsigned Reg = MO.getReg();
+ if (!Reg)
+ continue;
- if (MO.isRegister() && MO.isUse()) {
- unsigned Reg = MO.getReg();
- if (!Reg) continue;
-
- if (Reg == IncomingReg) {
+ if (Reg == IncomingReg) {
+ if (!Found) // One kill of reg per instruction.
MO.setIsKill();
- return true;
- }
-
- if (TargetRegisterInfo::isPhysicalRegister(Reg) &&
- TargetRegisterInfo::isPhysicalRegister(IncomingReg) &&
- RegInfo->isSuperRegister(IncomingReg, Reg) &&
- MO.isKill())
- // A super-register kill already exists.
- return true;
+ Found = true;
+ } else if (isPhysReg && MO.isKill() &&
+ TargetRegisterInfo::isPhysicalRegister(Reg)) {
+ // A super-register kill already exists.
+ if (RegInfo->isSuperRegister(IncomingReg, Reg))
+ Found = true;
+ else if (RegInfo->isSubRegister(IncomingReg, Reg))
+ DeadOps.push_back(i);
}
}
+ // Trim unneeded kill operands.
+ while (!DeadOps.empty()) {
+ unsigned OpIdx = DeadOps.back();
+ if (getOperand(OpIdx).isImplicit())
+ RemoveOperand(OpIdx);
+ else
+ getOperand(OpIdx).setIsKill(false);
+ DeadOps.pop_back();
+ }
+
// If not found, this means an alias of one of the operands is killed. Add a
// new implicit operand if required.
- if (AddIfNotFound) {
+ if (!Found && AddIfNotFound) {
addOperand(MachineOperand::CreateReg(IncomingReg,
false /*IsDef*/,
true /*IsImp*/,
true /*IsKill*/));
return true;
}
-
- return false;
+ return Found;
}
bool MachineInstr::addRegisterDead(unsigned IncomingReg,
const TargetRegisterInfo *RegInfo,
bool AddIfNotFound) {
+ bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(IncomingReg);
bool Found = false;
+ SmallVector<unsigned,4> DeadOps;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
MachineOperand &MO = getOperand(i);
- if (MO.isRegister() && MO.isDef()) {
- unsigned Reg = MO.getReg();
- if (!Reg)
- continue;
- if (Reg == IncomingReg) {
- MO.setIsDead();
+ if (!MO.isRegister() || !MO.isDef())
+ continue;
+ unsigned Reg = MO.getReg();
+ if (Reg == IncomingReg) {
+ MO.setIsDead();
+ Found = true;
+ } else if (isPhysReg && MO.isDead() &&
+ TargetRegisterInfo::isPhysicalRegister(Reg)) {
+ // There exists a super-register that's marked dead.
+ if (RegInfo->isSuperRegister(IncomingReg, Reg))
Found = true;
- break;
- } else if (TargetRegisterInfo::isPhysicalRegister(Reg) &&
- TargetRegisterInfo::isPhysicalRegister(IncomingReg) &&
- RegInfo->isSuperRegister(IncomingReg, Reg) &&
- MO.isDead())
- // There exists a super-register that's marked dead.
- return true;
+ else if (RegInfo->isSubRegister(IncomingReg, Reg))
+ DeadOps.push_back(i);
}
}
+ // Trim unneeded dead operands.
+ while (!DeadOps.empty()) {
+ unsigned OpIdx = DeadOps.back();
+ if (getOperand(OpIdx).isImplicit())
+ RemoveOperand(OpIdx);
+ else
+ getOperand(OpIdx).setIsDead(false);
+ DeadOps.pop_back();
+ }
+
// If not found, this means an alias of one of the operand is dead. Add a
// new implicit operand.
if (!Found && AddIfNotFound) {
projects / oota-llvm.git / blobdiff