Add SplitKit API to query and select the current interval being worked on.

This makes it possible to target multiple registers in one pass.

llvm-svn: 129374

1 files changed, 9 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/SplitKit.h b/llvm/lib/CodeGen/SplitKit.h
index f1ff501fbdd..fab56f70d9b 100644
--- a/llvm/lib/CodeGen/SplitKit.h
+++ b/llvm/lib/CodeGen/SplitKit.h
@@ -283,7 +283,15 @@ public:
   void reset(LiveRangeEdit&);
 
   /// Create a new virtual register and live interval.
-  void openIntv();
+  /// Return the interval index, starting from 1. Interval index 0 is the
+  /// implicit complement interval.
+  unsigned openIntv();
+
+  /// currentIntv - Return the current interval index.
+  unsigned currentIntv() const { return OpenIdx; }
+
+  /// selectIntv - Select a previously opened interval index.
+  void selectIntv(unsigned Idx);
 
   /// enterIntvBefore - Enter the open interval before the instruction at Idx.
   /// If the parent interval is not live before Idx, a COPY is not inserted.