Subzero: Automatically infer regalloc preferences and overlap.

src/IceInstX8632.h

 //===- subzero/src/IceInstX8632.h - Low-level x86 instructions --*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the InstX8632 and OperandX8632 classes and
@@ skipping 726 matching lines @@
 template <InstX8632::InstKindX8632 K>
 class InstX8632Movlike : public InstX8632 {
 public:
   static InstX8632Movlike *create(Cfg *Func, Variable *Dest, Operand *Source) {
     return new (Func->allocate<InstX8632Movlike>())
         InstX8632Movlike(Func, Dest, Source);
   }
   virtual bool isRedundantAssign() const {
     return checkForRedundantAssign(getDest(), getSrc(0));
   }
+  virtual bool isSimpleAssign() const { return true; }
   virtual void emit(const Cfg *Func) const;
   virtual void dump(const Cfg *Func) const {
     Ostream &Str = Func->getContext()->getStrDump();
     Str << Opcode << "." << getDest()->getType() << " ";
     dumpDest(Func);
     Str << ", ";
     dumpSources(Func);
   }
   static bool classof(const Inst *Inst) { return isClassof(Inst, K); }
 
@@ skipping 435 matching lines @@
   virtual void dump(const Cfg *Func) const;
   static bool classof(const Inst *Inst) { return isClassof(Inst, Movsx); }
 
 private:
   InstX8632Movsx(Cfg *Func, Variable *Dest, Operand *Source);
   InstX8632Movsx(const InstX8632Movsx &) LLVM_DELETED_FUNCTION;
   InstX8632Movsx &operator=(const InstX8632Movsx &) LLVM_DELETED_FUNCTION;
   virtual ~InstX8632Movsx() {}
 };
 
-// Movsx - copy from a narrower integer type to a wider integer
+// Movzx - copy from a narrower integer type to a wider integer
 // type, with zero extension.
 class InstX8632Movzx : public InstX8632 {
 public:
   static InstX8632Movzx *create(Cfg *Func, Variable *Dest, Operand *Source) {
     return new (Func->allocate<InstX8632Movzx>())
         InstX8632Movzx(Func, Dest, Source);
   }
   virtual void emit(const Cfg *Func) const;
   virtual void dump(const Cfg *Func) const;
   static bool classof(const Inst *Inst) { return isClassof(Inst, Movzx); }
@@ skipping 194 matching lines @@
 template <> void InstX8632Psub::emit(const Cfg *Func) const;
 template <> void InstX8632Sqrtss::emit(const Cfg *Func) const;
 template <> void InstX8632Subss::emit(const Cfg *Func) const;
 
 template <> void InstX8632Cbwdq::emitIAS(const Cfg *Func) const;
 template <> void InstX8632Movd::emitIAS(const Cfg *Func) const;
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEINSTX8632_H