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Go through the machine instruction's operands to make sure that we're not

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marking both a super- and sub-register as "killed". This removes implicit uses
that are marked as "killed".



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47862 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2008-03-03 22:14:33 +00:00
parent a0a570cec6
commit 4a23d72ec2
1 changed files with 58 additions and 18 deletions
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76
lib/CodeGen/MachineInstr.cpp
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@ -678,34 +678,74 @@ void MachineInstr::print(std::ostream &OS, const TargetMachine *TM) const {
bool MachineInstr::addRegisterKilled(unsigned IncomingReg,
const TargetRegisterInfo *RegInfo,
bool AddIfNotFound) {
bool Found = false;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
// Go through the machine instruction's operands to eliminate any potentially
// illegal conditions. I.e., a super- and sub-register both marked "kill".
Restart:
for (unsigned i = 0, e = getNumOperands(); i < e; ++i) {
MachineOperand &MO = getOperand(i);
if (MO.isRegister() && MO.isUse()) {
unsigned Reg = MO.getReg();
if (!Reg)
if (!Reg || IncomingReg == Reg ||
!TargetRegisterInfo::isPhysicalRegister(Reg) ||
!TargetRegisterInfo::isPhysicalRegister(IncomingReg))
continue;
if (Reg == IncomingReg) {
MO.setIsKill();
Found = true;
break;
} else if (TargetRegisterInfo::isPhysicalRegister(Reg) &&
TargetRegisterInfo::isPhysicalRegister(IncomingReg) &&
RegInfo->isSuperRegister(IncomingReg, Reg) &&
MO.isKill())
// A super-register kill already exists.
Found = true;
if (RegInfo->isSubRegister(IncomingReg, Reg)) {
if (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);
goto Restart; // Instruction was modified, redo checking.
} else {
// The super-register is going to take care of this kill
// information.
MO.setIsKill(false);
}
}
} else 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 not found, this means an alias of one of the operand is killed. Add a
// If the register already exists, then make sure it or its super-register is
// marked "kill".
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
MachineOperand &MO = getOperand(i);
if (MO.isRegister() && MO.isUse()) {
unsigned Reg = MO.getReg();
if (!Reg) continue;
if (Reg == IncomingReg) {
MO.setIsKill();
return true;
} else if (TargetRegisterInfo::isPhysicalRegister(Reg) &&
TargetRegisterInfo::isPhysicalRegister(IncomingReg) &&
RegInfo->isSuperRegister(IncomingReg, Reg) &&
MO.isKill()) {
// A super-register kill already exists.
return true;
}
}
}
// If not found, this means an alias of one of the operands is killed. Add a
// new implicit operand if required.
if (!Found && AddIfNotFound) {
addOperand(MachineOperand::CreateReg(IncomingReg, false/*IsDef*/,
true/*IsImp*/,true/*IsKill*/));
if (AddIfNotFound) {
addOperand(MachineOperand::CreateReg(IncomingReg,
false /*IsDef*/,
true /*IsImp*/,
true /*IsKill*/));
return true;
}
return Found;
return false;
}
bool MachineInstr::addRegisterDead(unsigned IncomingReg,