Subzero. Eliminates the use of Variable64On32 as operands in ARM.

src/IceInstARM32.h

 //===- subzero/src/IceInstARM32.h - ARM32 machine instructions --*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 1115 matching lines @@
   bool isRedundantAssign() const override {
     return !isMultiDest() && !isMultiSource() &&
            checkForRedundantAssign(getDest(), getSrc(0));
   }
   bool isSimpleAssign() const override { return true; }
   void emit(const Cfg *Func) const override;
   void emitIAS(const Cfg *Func) const override;
   void dump(const Cfg *Func) const override;
   static bool classof(const Inst *Inst) { return isClassof(Inst, Mov); }
 
-  bool isMultiDest() const {
-    assert(getDest() != nullptr);
-    return llvm::isa<Variable64On32>(getDest());
+  bool isMultiDest() const { return DestHi != nullptr; }
+
+  bool isMultiSource() const {
+    assert(getSrcSize() == 1 || getSrcSize() == 2);
+    return getSrcSize() == 2;
   }
 
-  bool isMultiSource() const {
-    assert(getSrcSize() == 1);
-    return llvm::isa<Variable64On32>(getSrc(0));
-  }
+  Variable *getDestHi() const { return DestHi; }
 
 private:
   InstARM32Mov(Cfg *Func, Variable *Dest, Operand *Src,
-               CondARM32::Cond Predicate)
-      : InstARM32Pred(Func, InstARM32::Mov, 1, Dest, Predicate) {
-    addSource(Src);
-  }
+               CondARM32::Cond Predicate);
 
   void emitMultiDestSingleSource(const Cfg *Func) const;
   void emitSingleDestMultiSource(const Cfg *Func) const;
   void emitSingleDestSingleSource(const Cfg *Func) const;
+
+  Variable *DestHi = nullptr;
 };
 
 class InstARM32Vcmp final : public InstARM32Pred {
   InstARM32Vcmp() = delete;
   InstARM32Vcmp(const InstARM32Vcmp &) = delete;
   InstARM32Vcmp &operator=(const InstARM32Vcmp &) = delete;
 
 public:
   static InstARM32Vcmp *create(Cfg *Func, Variable *Src0, Variable *Src1,
                                CondARM32::Cond Predicate) {
@@ skipping 53 matching lines @@
 // default implementations. Without this, there is the possibility of ODR
 // violations and link errors.
 
 template <> void InstARM32Ldr::emit(const Cfg *Func) const;
 template <> void InstARM32Movw::emit(const Cfg *Func) const;
 template <> void InstARM32Movt::emit(const Cfg *Func) const;
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEINSTARM32_H