Add Target hook to duplicate machine instructions.

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92873 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 0 deletions

diff --git a/include/llvm/Target/TargetInstrInfo.h b/include/llvm/Target/TargetInstrInfo.h
index 1bcd6fd836..f7798018b5 100644
--- a/include/llvm/Target/TargetInstrInfo.h
+++ b/include/llvm/Target/TargetInstrInfo.h
@@ -232,6 +232,12 @@ public:
                              const MachineInstr *Orig,
                              const TargetRegisterInfo *TRI) const = 0;
 
+  /// duplicate - Create a duplicate of the Orig instruction in MF. This is like
+  /// MachineFunction::CloneMachineInstr(), but the target may update operands
+  /// that are required to be unique.
+  virtual MachineInstr *duplicate(MachineInstr *Orig,
+                                  MachineFunction &MF) const = 0;
+
   /// convertToThreeAddress - This method must be implemented by targets that
   /// set the M_CONVERTIBLE_TO_3_ADDR flag.  When this flag is set, the target
   /// may be able to convert a two-address instruction into one or more true
@@ -560,6 +566,8 @@ public:
                              unsigned DestReg, unsigned SubReg,
                              const MachineInstr *Orig,
                              const TargetRegisterInfo *TRI) const;
+  virtual MachineInstr *duplicate(MachineInstr *Orig,
+                                  MachineFunction &MF) const;
   virtual bool isIdentical(const MachineInstr *MI,
                            const MachineInstr *Other,
                            const MachineRegisterInfo *MRI) const;