Teach tablegen how to inherit from classes in 'defm' definitions.

The rule is simple: only inherit from a class list if they come
in the end, after the last multiclass.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106305 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 36 insertions, 0 deletions

diff --git a/test/TableGen/defmclass.td b/test/TableGen/defmclass.td
new file mode 100644
index 0000000000..ef8e8f794b
--- /dev/null
+++ b/test/TableGen/defmclass.td
@@ -0,0 +1,36 @@
+// RUN: tblgen %s | FileCheck %s
+// XFAIL: vg_leak
+
+class XD { bits<4> Prefix = 11; }
+// CHECK: Prefix = { 1, 1, 0, 0 };
+class XS { bits<4> Prefix = 12; }
+class VEX { bit hasVEX_4VPrefix = 1; }
+
+def xd : XD;
+
+class BaseI {
+  bits<4> Prefix = 0;
+  bit hasVEX_4VPrefix = 0;
+}
+
+class I<bits<4> op> : BaseI {
+  bits<4> opcode = op;
+  int val = !if(!eq(Prefix, xd.Prefix), 7, 21);
+}
+
+multiclass R {
+  def rr : I<4>;
+}
+
+multiclass M {
+  def rm : I<2>;
+}
+
+multiclass Y {
+  defm SS : R, M, XD;
+// CHECK: Prefix = { 1, 1, 0, 0 };
+// CHECK: Prefix = { 1, 1, 0, 0 };
+  defm SD : R, M, XS;
+}
+
+defm Instr : Y, VEX;