Specify SubRegIndex components on the index itself.

It is simpler to define a composite index directly:

  def ssub_2 : SubRegIndex<[dsub_1, ssub_0]>;
  def ssub_3 : SubRegIndex<[dsub_1, ssub_1]>;

Than specifying the composite indices on each register:

  CompositeIndices = [(ssub_2 dsub_1, ssub_0),
                      (ssub_3 dsub_1, ssub_1)] in ...

This also makes it clear that SubRegIndex composition is supposed to be
unique.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149556 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 0 deletions

diff --git a/utils/TableGen/CodeGenRegisters.h b/utils/TableGen/CodeGenRegisters.h
index b83ad6e785..5fc0f65739 100644
--- a/utils/TableGen/CodeGenRegisters.h
+++ b/utils/TableGen/CodeGenRegisters.h
@@ -71,6 +71,9 @@ namespace llvm {
       return (Ins.second || Ins.first->second == B) ? 0 : Ins.first->second;
     }
 
+    // Update the composite maps of components specified in 'ComposedOf'.
+    void updateComponents(CodeGenRegBank&);
+
     // Clean out redundant composite mappings.
     void cleanComposites();