[llvm-commits] CVS: llvm/include/llvm/Target/TargetInstrInfo.h

[Chris Lattner]

Changes in directory llvm/include/llvm/Target:

TargetInstrInfo.h updated: 1.74 -> 1.75
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Log message:

Add a new method, described in the comment.


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Diffs of the changes:  (+12 -0)

Index: llvm/include/llvm/Target/TargetInstrInfo.h
diff -u llvm/include/llvm/Target/TargetInstrInfo.h:1.74 llvm/include/llvm/Target/TargetInstrInfo.h:1.75
--- llvm/include/llvm/Target/TargetInstrInfo.h:1.74	Sat Jan  1 20:28:31 2005
+++ llvm/include/llvm/Target/TargetInstrInfo.h	Wed Jan 19 00:53:02 2005
@@ -177,6 +177,18 @@
     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,