diff --git a/llvm/lib/TableGen/TGParser.cpp b/llvm/lib/TableGen/TGParser.cpp
--- a/llvm/lib/TableGen/TGParser.cpp
+++ b/llvm/lib/TableGen/TGParser.cpp
@@ -2640,6 +2640,11 @@
     return TokError("Value '" + FieldName->getValue() + "' unknown!");
 
   RecTy *Type = Field->getType();
+  if (!BitList.empty() && isa<BitsRecTy>(Type)) {
+    // When assigning to a subset of a 'bits' object, expect the RHS to have
+    // the type of that subset instead of the type of the whole object.
+    Type = BitsRecTy::get(BitList.size());
+  }
 
   Init *Val = ParseValue(CurRec, Type);
   if (!Val) return true;
diff --git a/llvm/test/TableGen/BitsInit.td b/llvm/test/TableGen/BitsInit.td
--- a/llvm/test/TableGen/BitsInit.td
+++ b/llvm/test/TableGen/BitsInit.td
@@ -56,6 +56,10 @@
   // Make sure we can initialise ints with bits<> values.
   int J = H;
   int K = { 0, 1 };
+
+  bits<2> L;
+  let L{0} = 1;
+  let L{1} = !eq(L{0}, 0);
 }
 
 // CHECK: def {{.*}} {
@@ -82,4 +86,5 @@
 // CHECK: bits<16> I = { 0, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0 };
 // CHECK: int J = 52275;
 // CHECK: int K = 1;
+// CHECK: bits<2> L = { 0, 1 };
 // CHECK: }