Add the Optimize Compares pass (disabled by default).

[oota-llvm.git] / include / llvm / Target / TargetInstrInfo.h

diff --git a/include/llvm/Target/TargetInstrInfo.h b/include/llvm/Target/TargetInstrInfo.h
index d5fe33ff88c2c059ff4699de60adad589f750c49..1c6ac1a61c772e9f422d764675aa812d59d65436 100644 (file)
--- a/include/llvm/Target/TargetInstrInfo.h
+++ b/include/llvm/Target/TargetInstrInfo.h
@@ -576,6 +576,21 @@ public:
   /// register allocation.
   virtual ScheduleHazardRecognizer*
   CreateTargetPostRAHazardRecognizer(const InstrItineraryData&) const = 0;
+
+  /// isCompareInstr - If the machine instruction is a comparison instruction,
+  /// then return true. Also return the source register in SrcReg and the value
+  /// it compares against in CmpValue.
+  virtual bool isCompareInstr(const MachineInstr *MI,
+                              unsigned &SrcReg, int &CmpValue) const {
+    return false;
+  }
+
+  /// convertToSetZeroFlag - Convert the instruction to set the zero flag so
+  /// that we can remove a "comparison with zero".
+  virtual bool convertToSetZeroFlag(MachineInstr *Instr,
+                                    MachineInstr *CmpInstr) const {
+    return false;
+  }
 };
 
 /// TargetInstrInfoImpl - This is the default implementation of