Imported Upstream version 5.18.0.161

Former-commit-id: 4db48158d3a35497b8f118ab21b5f08ac3d86d98

external/llvm/test/TableGen/2010-03-24-PrematureDefaults.td

@@ -0,0 +1,44 @@
+// RUN: llvm-tblgen %s | FileCheck %s
+// XFAIL: vg_leak
+
+class A<int k, bits<2> x = 1> {
+  int K = k;
+  bits<2> Bits = x;
+}
+
+// CHECK: def a1
+// CHECK: Bits = { 0, 1 }
+def a1 : A<12>;
+
+// CHECK: def a2
+// CHECK: Bits = { 1, 0 }
+def a2 : A<13, 2>;
+
+// Here was the bug: X.Bits would get resolved to the default a1.Bits while
+// resolving the first template argument. When the second template argument
+// was processed, X would be set correctly, but Bits retained the default
+// value.
+class B<int k, A x = a1> {
+  A X = x;
+  bits<2> Bits = X.Bits;
+}
+
+// CHECK: def b1
+// CHECK: Bits = { 0, 1 }
+def b1 : B<27>;
+
+// CHECK: def b2
+// CHECK: Bits = { 1, 0 }
+def b2 : B<28, a2>;
+
+class C<A x = a1> {
+  bits<2> Bits = x.Bits;
+}
+
+// CHECK: def c1
+// CHECK: Bits = { 0, 1 }
+def c1 : C;
+
+// CHECK: def c2
+// CHECK: Bits = { 1, 0 }
+def c2 : C<a2>;