Subzero : Live Range Splitting after initial Register Allocation

src/IceRegAlloc.h

Index: src/IceRegAlloc.h
diff --git a/src/IceRegAlloc.h b/src/IceRegAlloc.h
index fb1a0d86560ab858920049679573a89b3e57a19b..4738ba81fc858ce7a83d862d032c6ae7b7831e4a 100644
--- a/src/IceRegAlloc.h
+++ b/src/IceRegAlloc.h
@@ -32,7 +32,8 @@ class LinearScan {
 
 public:
   explicit LinearScan(Cfg *Func);
-  void init(RegAllocKind Kind);
+  void init(RegAllocKind Kind, CfgSet<Variable *> ExtraVars = {},
+            CfgSet<Variable *> ExcludeVars = {});
   void scan(const SmallBitVector &RegMask, bool Randomized);
   // Returns the number of times some variable has been assigned a register but
   // later evicted because of a higher-priority allocation.  The idea is that we
@@ -40,6 +41,7 @@ public:
   // until there are no more evictions.
   SizeT getNumEvictions() const { return Evicted.size(); }
   bool hasEvictions() const { return !Evicted.empty(); }
+  void setSplittingMode() { SplittingMode = true; }
   void dump(Cfg *Func) const;
 
   // TODO(stichnot): Statically choose the size based on the target being
@@ -131,9 +133,10 @@ private:
   llvm::SmallVector<const SmallBitVector *, REGS_SIZE> RegAliases;
   bool FindPreference = false;
   bool FindOverlap = false;
-
   const bool Verbose;
   const bool UseReserve;
+  bool SplittingMode = false;
+  CfgVector<Variable *> Vars;
 };
 
 } // end of namespace Ice