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, 0 deletions

diff --git a/lib/CodeGen/LiveIntervalUnion.h b/lib/CodeGen/LiveIntervalUnion.h
index d8dcbda8d3..ff23cf61a3 100644
--- a/lib/CodeGen/LiveIntervalUnion.h
+++ b/lib/CodeGen/LiveIntervalUnion.h
@@ -24,6 +24,7 @@
 
 namespace llvm {
 
+class MachineLoopRange;
 class TargetRegisterInfo;
 
 #ifndef NDEBUG
@@ -76,6 +77,10 @@ public:
   bool empty() const { return Segments.empty(); }
   SlotIndex startIndex() const { return Segments.start(); }
 
+  // Provide public access to the underlying map to allow overlap iteration.
+  typedef LiveSegments Map;
+  const Map &getMap() { return Segments; }
+
   // Add a live virtual register to this union and merge its segments.
   void unify(LiveInterval &VirtReg);
 
@@ -223,6 +228,10 @@ public:
       return InterferingVRegs;
     }
 
+    /// checkLoopInterference - Return true if there is interference overlapping
+    /// Loop.
+    bool checkLoopInterference(MachineLoopRange*);
+
     void print(raw_ostream &OS, const TargetRegisterInfo *TRI);
   private:
     Query(const Query&);          // DO NOT IMPLEMENT