diff options
| -rw-r--r-- | include/llvm/Target/TargetInstrInfo.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/llvm/Target/TargetInstrInfo.h b/include/llvm/Target/TargetInstrInfo.h index 855ce86ed0..d5237f2f7c 100644 --- a/include/llvm/Target/TargetInstrInfo.h +++ b/include/llvm/Target/TargetInstrInfo.h @@ -177,6 +177,18 @@ public: return 0; } + /// commuteInstruction - If a target has any instructions that are commutable, + /// but require converting to a different instruction or making non-trivial + /// changes to commute them, this method can overloaded to do this. The + /// default implementation of this method simply swaps the first two operands + /// of MI and returns it. + /// + /// If a target wants to make more aggressive changes, they can construct and + /// return a new machine instruction. If an instruction cannot commute, it + /// can also return null. + /// + virtual MachineInstr *commuteInstruction(MachineInstr *MI) const; + /// Insert a goto (unconditional branch) sequence to TMBB, at the /// end of MBB virtual void insertGoto(MachineBasicBlock& MBB, |