diff options
Diffstat (limited to 'lib')
-rw-r--r-- | lib/CodeGen/MachineInstr.cpp | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp index e0444fa038..04bd265228 100644 --- a/lib/CodeGen/MachineInstr.cpp +++ b/lib/CodeGen/MachineInstr.cpp @@ -169,6 +169,37 @@ 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) { + for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { + MachineOperand &MO = getOperand(i); + if (MO.isReg() && MO.isUse() && MO.getReg() == Reg) + return &MO; + } + return NULL; +} + +/// copyKillDeadInfo - Copies kill / dead operand properties from MI. +/// +void MachineInstr::copyKillDeadInfo(const MachineInstr *MI) { + for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { + const MachineOperand &MO = MI->getOperand(i); + if (!MO.isReg() || (!MO.isKill() && !MO.isDead())) + continue; + for (unsigned j = 0, ee = getNumOperands(); j != ee; ++j) { + MachineOperand &MOp = getOperand(j); + if (!MOp.isIdenticalTo(MO)) + continue; + if (MO.isKill()) + MOp.setIsKill(); + else + MOp.setIsDead(); + break; + } + } +} + void MachineInstr::dump() const { llvm_cerr << " " << *this; } |