add a new target hook.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43165 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 0 deletions

diff --git a/include/llvm/Target/TargetLowering.h b/include/llvm/Target/TargetLowering.h
index e7e99a7..48f3d7c 100644
--- a/include/llvm/Target/TargetLowering.h
+++ b/include/llvm/Target/TargetLowering.h
@@ -885,6 +885,15 @@ public:
   /// implement this.  The default implementation of this aborts.
   virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
 
+  /// ExpandOperation - This callback is invoked for operations that are 
+  /// unsupported by the target, which are registered to use 'custom' lowering,
+  /// and whose result type needs to be expanded.
+  ///
+  /// If the target has no operations that require custom lowering, it need not
+  /// implement this.  The default implementation of this aborts.
+  virtual std::pair<SDOperand,SDOperand> 
+    ExpandOperation(SDOperand Op, SelectionDAG &DAG);
+  
   /// IsEligibleForTailCallOptimization - Check whether the call is eligible for
   /// tail call optimization. Targets which want to do tail call optimization
   /// should override this function.