diff options
Diffstat (limited to 'lib/CodeGen/DeadMachineInstructionElim.cpp')
| -rw-r--r-- | lib/CodeGen/DeadMachineInstructionElim.cpp | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/lib/CodeGen/DeadMachineInstructionElim.cpp b/lib/CodeGen/DeadMachineInstructionElim.cpp index b4394e8d56..8964269dde 100644 --- a/lib/CodeGen/DeadMachineInstructionElim.cpp +++ b/lib/CodeGen/DeadMachineInstructionElim.cpp @@ -33,7 +33,6 @@ namespace { const MachineRegisterInfo *MRI; const TargetInstrInfo *TII; BitVector LivePhysRegs; - BitVector ReservedRegs; public: static char ID; // Pass identification, replacement for typeid @@ -70,7 +69,7 @@ bool DeadMachineInstructionElim::isDead(const MachineInstr *MI) const { unsigned Reg = MO.getReg(); if (TargetRegisterInfo::isPhysicalRegister(Reg)) { // Don't delete live physreg defs, or any reserved register defs. - if (LivePhysRegs.test(Reg) || ReservedRegs.test(Reg)) + if (LivePhysRegs.test(Reg) || MRI->isReserved(Reg)) return false; } else { if (!MRI->use_nodbg_empty(Reg)) @@ -90,9 +89,6 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) { TRI = MF.getTarget().getRegisterInfo(); TII = MF.getTarget().getInstrInfo(); - // Treat reserved registers as always live. - ReservedRegs = TRI->getReservedRegs(MF); - // Loop over all instructions in all blocks, from bottom to top, so that it's // more likely that chains of dependent but ultimately dead instructions will // be cleaned up. @@ -101,7 +97,7 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) { MachineBasicBlock *MBB = &*I; // Start out assuming that reserved registers are live out of this block. - LivePhysRegs = ReservedRegs; + LivePhysRegs = MRI->getReservedRegs(); // Also add any explicit live-out physregs for this block. if (!MBB->empty() && MBB->back().isReturn()) |