diff options
| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-10-15 21:57:41 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-10-15 21:57:41 +0000 |
| commit | fb9ebbf236974beac31705eaeb9f50ab585af6ab (patch) | |
| tree | 7d01bb6c43ca1854b208c80f34b6158644eb78f9 /lib/CodeGen/DeadMachineInstructionElim.cpp | |
| parent | e4f273908bd37df5f0f6b2c575dcb2af99f6b85b (diff) | |
Switch most getReservedRegs() clients to the MRI equivalent.
Using the cached bit vector in MRI avoids comstantly allocating and
recomputing the reserved register bit vector.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165983 91177308-0d34-0410-b5e6-96231b3b80d8
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()) |