Add Target hook to duplicate machine instructions.

Some instructions refer to unique labels, and so cannot be trivially cloned
with CloneMachineInstr.

llvm-svn: 92873

2 files changed, 8 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/TailDuplication.cpp b/llvm/lib/CodeGen/TailDuplication.cpp
index fddbebd9f7b..c99c74c0f4d 100644
--- a/llvm/lib/CodeGen/TailDuplication.cpp
+++ b/llvm/lib/CodeGen/TailDuplication.cpp
@@ -346,7 +346,7 @@ void TailDuplicatePass::DuplicateInstruction(MachineInstr *MI,
                                      MachineBasicBlock *PredBB,
                                      MachineFunction &MF,
                                      DenseMap<unsigned, unsigned> &LocalVRMap) {
-  MachineInstr *NewMI = MF.CloneMachineInstr(MI);
+  MachineInstr *NewMI = TII->duplicate(MI, MF);
   for (unsigned i = 0, e = NewMI->getNumOperands(); i != e; ++i) {
     MachineOperand &MO = NewMI->getOperand(i);
     if (!MO.isReg())
diff --git a/llvm/lib/CodeGen/TargetInstrInfoImpl.cpp b/llvm/lib/CodeGen/TargetInstrInfoImpl.cpp
index 393e315a321..a0fccabdb5a 100644
--- a/llvm/lib/CodeGen/TargetInstrInfoImpl.cpp
+++ b/llvm/lib/CodeGen/TargetInstrInfoImpl.cpp
@@ -150,6 +150,13 @@ void TargetInstrInfoImpl::reMaterialize(MachineBasicBlock &MBB,
   MBB.insert(I, MI);
 }
 
+MachineInstr *TargetInstrInfoImpl::duplicate(MachineInstr *Orig,
+                                             MachineFunction &MF) const {
+  assert(!Orig->getDesc().isNotDuplicable() &&
+         "Instruction cannot be duplicated");
+  return MF.CloneMachineInstr(Orig);
+}
+
 bool
 TargetInstrInfoImpl::isIdentical(const MachineInstr *MI,
                                  const MachineInstr *Other,