Add TargetRegisterClass::getSuperRegIndices().

This is a pointer into one of the tables used by
getMatchingSuperRegClass(). It makes it possible to use a shared
implementation of that function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156121 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 0 deletions

diff --git a/include/llvm/Target/TargetRegisterInfo.h b/include/llvm/Target/TargetRegisterInfo.h
index dd8044dd85..85562b6010 100644
--- a/include/llvm/Target/TargetRegisterInfo.h
+++ b/include/llvm/Target/TargetRegisterInfo.h
@@ -43,6 +43,7 @@ public:
   const MCRegisterClass *MC;
   const vt_iterator VTs;
   const uint32_t *SubClassMask;
+  const uint16_t *SuperRegIndices;
   const sc_iterator SuperClasses;
   const sc_iterator SuperRegClasses;
   ArrayRef<uint16_t> (*OrderFunc)(const MachineFunction&);
@@ -163,6 +164,18 @@ public:
     return SubClassMask;
   }
 
+  /// getSuperRegIndices - Returns a 0-terminated list of sub-register indices
+  /// that projec some super-register class into this register class. The list
+  /// has an entry for each Idx such that:
+  ///
+  ///   There exists SuperRC where:
+  ///     For all Reg in SuperRC:
+  ///       this->contains(Reg:Idx)
+  ///
+  const uint16_t *getSuperRegIndices() const {
+    return SuperRegIndices;
+  }
+
   /// getSuperClasses - Returns a NULL terminated list of super-classes.  The
   /// classes are ordered by ID which is also a topological ordering from large
   /// to small classes.  The list does NOT include the current class.