all predicates on an MnemonicAlias must be AssemblerPredicates.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117890 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/AsmMatcherEmitter.cpp

@@ -1466,14 +1466,18 @@ static std::string GetAliasRequiredFeatures(Record *R,
   std::string Result;
   unsigned NumFeatures = 0;
   for (unsigned i = 0, e = ReqFeatures.size(); i != e; ++i) {
-    if (SubtargetFeatureInfo *F = Info.getSubtargetFeature(ReqFeatures[i])) {
+    SubtargetFeatureInfo *F = Info.getSubtargetFeature(ReqFeatures[i]);
+    
+    if (F == 0)
+      throw TGError(R->getLoc(), "Predicate '" + ReqFeatures[i]->getName() +
+                    "' is not marked as an AssemblerPredicate!");
+    
     if (NumFeatures)
       Result += '|';
   
     Result += F->getEnumName();
     ++NumFeatures;
   }
-  }
   
   if (NumFeatures > 1)
     Result = '(' + Result + ')';