Use llvm_unreachable for unknown TargetCostKind.

TargetTransformInfo::getInstructionCost's switch covers all TargetCostKind cases so we shouldn't return for a default case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312888 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Analysis/TargetTransformInfo.h b/include/llvm/Analysis/TargetTransformInfo.h
index 99afdb1cb9678e8b38735f3f9108326d6215fa22..dbf95a716ed6087dfac0881dded45932f66b9f07 100644 (file)
--- a/include/llvm/Analysis/TargetTransformInfo.h
+++ b/include/llvm/Analysis/TargetTransformInfo.h
@@ -142,8 +142,7 @@ public:
     case TCK_CodeSize:
       return getUserCost(I);
     }
-
-    return 0;
+    llvm_unreachable("Unknown instruction cost kind");
   }
 
   /// \brief Underlying constants for 'cost' values in this interface.