Revert of Reland: Remove register index/code indirection

test/cctest/test-code-stubs-mips.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Rrdistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Rrdistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Rrdistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 16 matching lines @@
 
 #include <stdlib.h>
 
 #include "src/v8.h"
 
 #include "src/base/platform/platform.h"
 #include "src/code-stubs.h"
 #include "src/factory.h"
 #include "src/macro-assembler.h"
 #include "src/mips/constants-mips.h"
-#include "src/register-configuration.h"
 #include "src/simulator.h"
 #include "test/cctest/cctest.h"
 #include "test/cctest/test-code-stubs.h"
 
 using namespace v8::internal;
 
 #define __ masm.
 
 ConvertDToIFunc MakeConvertDToIFuncTrampoline(Isolate* isolate,
                                               Register source_reg,
@@ skipping 25 matching lines @@
     __ Move(f12, a0, a1);
   }
   // Push the double argument.
   __ Subu(sp, sp, Operand(kDoubleSize));
   __ sdc1(f12, MemOperand(sp));
   __ Move(source_reg, sp);
 
   // Save registers make sure they don't get clobbered.
   int source_reg_offset = kDoubleSize;
   int reg_num = 2;
-  for (; reg_num < Register::kNumRegisters; ++reg_num) {
+  for (; reg_num < Register::NumAllocatableRegisters(); ++reg_num) {
     Register reg = Register::from_code(reg_num);
-    if (reg.IsAllocatable()) {
-      if (!reg.is(destination_reg)) {
-        __ push(reg);
-        source_reg_offset += kPointerSize;
-      }
+    if (!reg.is(destination_reg)) {
+      __ push(reg);
+      source_reg_offset += kPointerSize;
     }
   }
 
   // Re-push the double argument.
   __ Subu(sp, sp, Operand(kDoubleSize));
   __ sdc1(f12, MemOperand(sp));
 
   // Call through to the actual stub
   if (inline_fastpath) {
     __ ldc1(f12, MemOperand(source_reg));
@@ skipping 90 matching lines @@
                                         false));
       RunAllTruncationTests(
           RunGeneratedCodeCallWrapper,
           MakeConvertDToIFuncTrampoline(isolate,
                                         source_registers[s],
                                         dest_registers[d],
                                         true));
     }
   }
 }