Subzero: Local variable splitting.

src/IceTargetLowering.h

 //===- subzero/src/IceTargetLowering.h - Lowering interface -----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 303 matching lines @@
   virtual void emit(const ConstantUndef *C) const = 0;
   virtual void emit(const ConstantRelocatable *CR) const = 0;
 
   /// Performs target-specific argument lowering.
   virtual void lowerArguments() = 0;
 
   virtual void initNodeForLowering(CfgNode *) {}
   virtual void addProlog(CfgNode *Node) = 0;
   virtual void addEpilog(CfgNode *Node) = 0;
 
+  /// Create a properly-typed "mov" instruction.  This is primarily for local
+  /// variable splitting.
+  virtual Inst *createLoweredMove(Variable *Dest, Variable *SrcVar) {
+    // TODO(stichnot): make pure virtual by implementing for all targets
+    (void)Dest;
+    (void)SrcVar;
+    llvm::report_fatal_error("createLoweredMove() unimplemented");
+    return nullptr;
+  }
+
   virtual ~TargetLowering() = default;
 
 private:
   // This control variable is used by AutoBundle (RAII-style bundle
   // locking/unlocking) to prevent nested bundles.
   bool AutoBundling = false;
 
   /// This indicates whether we are in the genTargetHelperCalls phase, and
   /// therefore can do things like scalarization.
   bool GeneratingTargetHelpers = false;
@@ skipping 287 matching lines @@
   virtual void lower() {}
 
 protected:
   explicit TargetHeaderLowering(GlobalContext *Ctx) : Ctx(Ctx) {}
   GlobalContext *Ctx;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERING_H