Revert of Reland: Remove register index/code indirection

src/compiler/instruction-selector-impl.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_
 #define V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_
 
 #include "src/compiler/instruction.h"
 #include "src/compiler/instruction-selector.h"
 #include "src/compiler/linkage.h"
@@ skipping 33 matching lines @@
   }
 
   InstructionOperand DefineSameAsFirst(Node* node) {
     return Define(node,
                   UnallocatedOperand(UnallocatedOperand::SAME_AS_FIRST_INPUT,
                                      GetVReg(node)));
   }
 
   InstructionOperand DefineAsFixed(Node* node, Register reg) {
     return Define(node, UnallocatedOperand(UnallocatedOperand::FIXED_REGISTER,
-                                           reg.code(), GetVReg(node)));
+                                           Register::ToAllocationIndex(reg),
+                                           GetVReg(node)));
   }
 
   InstructionOperand DefineAsFixed(Node* node, DoubleRegister reg) {
     return Define(node,
                   UnallocatedOperand(UnallocatedOperand::FIXED_DOUBLE_REGISTER,
-                                     reg.code(), GetVReg(node)));
+                                     DoubleRegister::ToAllocationIndex(reg),
+                                     GetVReg(node)));
   }
 
   InstructionOperand DefineAsConstant(Node* node) {
     selector()->MarkAsDefined(node);
     int virtual_register = GetVReg(node);
     sequence()->AddConstant(virtual_register, ToConstant(node));
     return ConstantOperand(virtual_register);
   }
 
   InstructionOperand DefineAsLocation(Node* node, LinkageLocation location,
@@ skipping 27 matching lines @@
 
   // Use a unique register for the node that does not alias any temporary or
   // output registers.
   InstructionOperand UseUniqueRegister(Node* node) {
     return Use(node, UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER,
                                         GetVReg(node)));
   }
 
   InstructionOperand UseFixed(Node* node, Register reg) {
     return Use(node, UnallocatedOperand(UnallocatedOperand::FIXED_REGISTER,
-                                        reg.code(), GetVReg(node)));
+                                        Register::ToAllocationIndex(reg),
+                                        GetVReg(node)));
   }
 
   InstructionOperand UseFixed(Node* node, DoubleRegister reg) {
     return Use(node,
                UnallocatedOperand(UnallocatedOperand::FIXED_DOUBLE_REGISTER,
-                                  reg.code(), GetVReg(node)));
+                                  DoubleRegister::ToAllocationIndex(reg),
+                                  GetVReg(node)));
   }
 
   InstructionOperand UseImmediate(Node* node) {
     return sequence()->AddImmediate(ToConstant(node));
   }
 
   InstructionOperand UseLocation(Node* node, LinkageLocation location,
                                  MachineType type) {
     return Use(node, ToUnallocatedOperand(location, type, GetVReg(node)));
   }
 
   InstructionOperand TempRegister() {
     return UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER,
                               UnallocatedOperand::USED_AT_START,
                               sequence()->NextVirtualRegister());
   }
 
   InstructionOperand TempDoubleRegister() {
     UnallocatedOperand op = UnallocatedOperand(
         UnallocatedOperand::MUST_HAVE_REGISTER,
         UnallocatedOperand::USED_AT_START, sequence()->NextVirtualRegister());
     sequence()->MarkAsRepresentation(kRepFloat64, op.virtual_register());
     return op;
   }
 
   InstructionOperand TempRegister(Register reg) {
-    return UnallocatedOperand(UnallocatedOperand::FIXED_REGISTER, reg.code(),
+    return UnallocatedOperand(UnallocatedOperand::FIXED_REGISTER,
+                              Register::ToAllocationIndex(reg),
                               InstructionOperand::kInvalidVirtualRegister);
   }
 
   InstructionOperand TempImmediate(int32_t imm) {
     return sequence()->AddImmediate(Constant(imm));
   }
 
   InstructionOperand TempLocation(LinkageLocation location, MachineType type) {
     return ToUnallocatedOperand(location, type,
                                 sequence()->NextVirtualRegister());
@@ skipping 185 matching lines @@
                : (frame_state_descriptor->GetTotalSize() +
                   1);  // Include deopt id.
   }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_