Index: llvm/include/llvm/TableGen/Record.h
===================================================================
--- llvm/include/llvm/TableGen/Record.h
+++ llvm/include/llvm/TableGen/Record.h
@@ -905,7 +905,9 @@
   // possible to fold.
   Init *Fold(Record *CurRec, MultiClass *CurMultiClass) const override;
 
-  bool isComplete() const override { return false; }
+  bool isComplete() const override {
+    return LHS->isComplete() && MHS->isComplete() && RHS->isComplete();
+  }
 
   Init *resolveReferences(Record &R, const RecordVal *RV) const override;
 
Index: llvm/test/TableGen/if.td
===================================================================
--- llvm/test/TableGen/if.td
+++ llvm/test/TableGen/if.td
@@ -56,6 +56,23 @@
 // CHECK: def D8
 // CHECK-NEXT: bits<2> val = { 0, 0 };
 
+// Make sure !if gets evaluated throughout multiple layers of inheritance.
+class getInt<int c> {
+  int ret = !if(c, 0, 1);
+}
+class I1<int c> {
+  int i = getInt<c>.ret;
+}
+class I2<int c> : I1<c>;
+
+// CHECK: def DI1 {     // I1
+// CHECK-NEXT: int i = 0;
+def DI1: I1<1>;
+
+// CHECK: def DI2 {     // I1 I2
+// CHECK-NEXT: int i = 0;
+def DI2: I2<1>;
+
 // CHECK:      def One
 // CHECK-NEXT: list<int> first = [1, 2, 3];
 // CHECK-NEXT: list<int> rest = [1, 2, 3];