1 files changed, 9 insertions, 0 deletions
diff --git a/include/llvm/Target/TargetLowering.h b/include/llvm/Target/TargetLowering.h
index 091368382e..b49eeb2eea 100644
--- a/include/llvm/Target/TargetLowering.h
+++ b/include/llvm/Target/TargetLowering.h
@@ -1176,6 +1176,15 @@ public:
     return false;
   }
 
+  /// Return true if a truncation from Ty1 to Ty2 is permitted when deciding
+  /// whether a call is in tail position. Typically this means that both results
+  /// would be assigned to the same register or stack slot, but it could mean
+  /// the target performs adequate checks of its own before proceeding with the
+  /// tail call.
+  virtual bool allowTruncateForTailCall(Type * /*Ty1*/, Type * /*Ty2*/) const {
+    return false;
+  }
+
   virtual bool isTruncateFree(EVT /*VT1*/, EVT /*VT2*/) const {
     return false;
   }