Provide LiveIntervalUnion::Query::checkLoopInterference.

This is a three-way interval list intersection between a virtual register, a
live interval union, and a loop. It will be used to identify interference-free
loops for live range splitting.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122034 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 3 deletions

diff --git a/include/llvm/CodeGen/MachineLoopRanges.h b/include/llvm/CodeGen/MachineLoopRanges.h
index 7e6bec639c..730b729dba 100644
--- a/include/llvm/CodeGen/MachineLoopRanges.h
+++ b/include/llvm/CodeGen/MachineLoopRanges.h
@@ -29,15 +29,18 @@ class raw_ostream;
 /// MachineLoopRange - Range information for a single loop.
 class MachineLoopRange {
   friend class MachineLoopRanges;
-  typedef IntervalMap<SlotIndex, unsigned, 4> RangeMap;
-  typedef RangeMap::Allocator Allocator;
 
+public:
+  typedef IntervalMap<SlotIndex, unsigned, 4> Map;
+  typedef Map::Allocator Allocator;
+
+private:
   /// The mapped loop.
   const MachineLoop *const Loop;
 
   /// Map intervals to a bit mask.
   /// Bit 0 = inside loop block.
-  RangeMap Intervals;
+  Map Intervals;
 
   /// Create a MachineLoopRange, only accessible to MachineLoopRanges.
   MachineLoopRange(const MachineLoop*, Allocator&, SlotIndexes&);
@@ -47,6 +50,9 @@ public:
   /// inteructions.
   bool overlaps(SlotIndex Start, SlotIndex Stop);
 
+  /// getMap - Allow public read-only access for IntervalMapOverlaps.
+  const Map &getMap() { return Intervals; }
+
   /// print - Print loop ranges on OS.
   void print(raw_ostream&) const;
 };