[RegisterConfiguration] Streamline access to arch defaults, simplify Registers.

src/compiler/register-allocator.cc

 // 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.
 
 #include "src/base/adapters.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/register-allocator.h"
 #include "src/string-stream.h"
 
 namespace v8 {
@@ skipping 66 matching lines @@
 
 bool IsOutputFPRegisterOf(Instruction* instr, MachineRepresentation rep,
                           int code) {
   for (size_t i = 0; i < instr->OutputCount(); i++) {
     InstructionOperand* output = instr->OutputAt(i);
     if (output->IsFPRegister()) {
       const LocationOperand* op = LocationOperand::cast(output);
       if (kSimpleFPAliasing) {
         if (op->register_code() == code) return true;
       } else {
-        if (RegisterConfiguration::ArchDefault(RegisterConfiguration::TURBOFAN)
-                ->AreAliases(op->representation(), op->register_code(), rep,
-                             code)) {
+        if (RegisterConfiguration::Turbofan()->AreAliases(
+                op->representation(), op->register_code(), rep, code)) {
           return true;
         }
       }
     }
   }
   return false;
 }
 
 
 // TODO(dcarney): fix frame to allow frame accesses to half size location.
@@ skipping 716 matching lines @@
   wrapper.register_configuration_ = config;
   for (const LiveRange* i = this; i != nullptr; i = i->next()) {
     wrapper.range_ = i;
     os << wrapper << std::endl;
     if (!with_children) break;
   }
 }
 
 
 void LiveRange::Print(bool with_children) const {
-  const RegisterConfiguration* config =
-      RegisterConfiguration::ArchDefault(RegisterConfiguration::TURBOFAN);
-  Print(config, with_children);
+  Print(RegisterConfiguration::Turbofan(), with_children);
 }
 
 
 struct TopLevelLiveRange::SpillMoveInsertionList : ZoneObject {
   SpillMoveInsertionList(int gap_index, InstructionOperand* operand,
                          SpillMoveInsertionList* next)
       : gap_index(gap_index), operand(operand), next(next) {}
   const int gap_index;
   InstructionOperand* const operand;
   SpillMoveInsertionList* const next;
@@ skipping 2930 matching lines @@
         }
       }
     }
   }
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8