Subzero: Automatically infer regalloc preferences and overlap.

src/IceTargetLoweringX8632.h

 //===- subzero/src/IceTargetLoweringX8632.h - x86-32 lowering ---*- 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 TargetLoweringX8632 class, which
@@ skipping 129 matching lines @@
     Legal_Reg = 1 << 0, // physical register, not stack location
     Legal_Imm = 1 << 1,
     Legal_Mem = 1 << 2, // includes [eax+4*ecx] as well as [esp+12]
     // TODO(stichnot): LEAHACK: remove Legal_Reloc once a proper
     // emitter is used.
     Legal_Reloc = 1 << 3,
     Legal_All = ~Legal_None
   };
   typedef uint32_t LegalMask;
   Operand *legalize(Operand *From, LegalMask Allowed = Legal_All & ~Legal_Reloc,
-                    bool AllowOverlap = false,
                     int32_t RegNum = Variable::NoRegister);
-  Variable *legalizeToVar(Operand *From, bool AllowOverlap = false,
-                          int32_t RegNum = Variable::NoRegister);
+  Variable *legalizeToVar(Operand *From, int32_t RegNum = Variable::NoRegister);
   // Turn a pointer operand into a memory operand that can be
   // used by a real load/store operation. Legalizes the operand as well.
   // This is a nop if the operand is already a legal memory operand.
   OperandX8632Mem *FormMemoryOperand(Operand *Ptr, Type Ty);
 
   Variable *makeReg(Type Ty, int32_t RegNum = Variable::NoRegister);
   InstCall *makeHelperCall(const IceString &Name, Variable *Dest,
                            SizeT MaxSrcs) {
     bool SuppressMangling = true;
     const Type FunctionPointerType = IceType_i32;
@@ skipping 126 matching lines @@
   }
   void _lea(Variable *Dest, Operand *Src0) {
     Context.insert(InstX8632Lea::create(Func, Dest, Src0));
   }
   void _mfence() { Context.insert(InstX8632Mfence::create(Func)); }
   // If Dest=NULL is passed in, then a new variable is created, marked
   // as infinite register allocation weight, and returned through the
   // in/out Dest argument.
   void _mov(Variable *&Dest, Operand *Src0,
             int32_t RegNum = Variable::NoRegister) {
-    if (Dest == NULL) {
-      Dest = legalizeToVar(Src0, false, RegNum);
-    } else {
-      Context.insert(InstX8632Mov::create(Func, Dest, Src0));
-    }
+    if (Dest == NULL)
+      Dest = makeReg(Src0->getType(), RegNum);
+    Context.insert(InstX8632Mov::create(Func, Dest, Src0));
   }
   void _movd(Variable *Dest, Operand *Src0) {
     Context.insert(InstX8632Movd::create(Func, Dest, Src0));
   }
   void _movp(Variable *Dest, Operand *Src0) {
     Context.insert(InstX8632Movp::create(Func, Dest, Src0));
   }
   void _movq(Variable *Dest, Operand *Src0) {
     Context.insert(InstX8632Movq::create(Func, Dest, Src0));
   }
@@ skipping 190 matching lines @@
 };
 
 template <> void ConstantInteger32::emit(GlobalContext *Ctx) const;
 template <> void ConstantInteger64::emit(GlobalContext *Ctx) const;
 template <> void ConstantFloat::emit(GlobalContext *Ctx) const;
 template <> void ConstantDouble::emit(GlobalContext *Ctx) const;
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX8632_H