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Use findRegisterUseOperand to find a kill of particular register. 

llvm-svn: 34512
This commit is contained in:
Evan Cheng 2007-02-23 01:04:26 +00:00
parent 956fdeb694
commit 9965aebd5d
2 changed files with 8 additions and 5 deletions
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5
llvm/include/llvm/CodeGen/MachineInstr.h
View File

@ -390,8 +390,9 @@ public:
}
/// findRegisterUseOperand() - Returns the MachineOperand that is a use of
/// the specific register or NULL if it is not found.
MachineOperand *findRegisterUseOperand(unsigned Reg);
/// the specific register or NULL if it is not found. It further tightening
/// the search criteria to a use that kills the register if isKill is true.
MachineOperand *findRegisterUseOperand(unsigned Reg, bool isKill = false);
/// findRegisterDefOperand() - Returns the MachineOperand that is a def of
/// the specific register or NULL if it is not found.

8
llvm/lib/CodeGen/MachineInstr.cpp
View File

@ -170,12 +170,14 @@ bool MachineOperand::isIdenticalTo(const MachineOperand &Other) const {
}
/// findRegisterUseOperand() - Returns the MachineOperand that is a use of
/// the specific register or NULL if it is not found.
MachineOperand *MachineInstr::findRegisterUseOperand(unsigned Reg) {
/// the specific register or NULL if it is not found. It further tightening
/// the search criteria to a use that kills the register if isKill is true.
MachineOperand *MachineInstr::findRegisterUseOperand(unsigned Reg, bool isKill){
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
MachineOperand &MO = getOperand(i);
if (MO.isReg() && MO.isUse() && MO.getReg() == Reg)
return &MO;
if (!isKill || MO.isKill())
return &MO;
}
return NULL;
}