Revert of Remove register index/code indirection

src/arm/assembler-arm-inl.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 32 matching lines @@
 #include "src/debug/debug.h"
 
 
 namespace v8 {
 namespace internal {
 
 
 bool CpuFeatures::SupportsCrankshaft() { return IsSupported(VFP3); }
 
 
-int DoubleRegister::NumRegisters() {
+int Register::NumAllocatableRegisters() {
+  return kMaxNumAllocatableRegisters;
+}
+
+
+int DwVfpRegister::NumRegisters() {
   return CpuFeatures::IsSupported(VFP32DREGS) ? 32 : 16;
 }
 
 
+int DwVfpRegister::NumReservedRegisters() {
+  return kNumReservedRegisters;
+}
+
+
+int DwVfpRegister::NumAllocatableRegisters() {
+  return NumRegisters() - kNumReservedRegisters;
+}
+
+
+// static
+int DwVfpRegister::NumAllocatableAliasedRegisters() {
+  return LowDwVfpRegister::kMaxNumLowRegisters - kNumReservedRegisters;
+}
+
+
+int DwVfpRegister::ToAllocationIndex(DwVfpRegister reg) {
+  DCHECK(!reg.is(kDoubleRegZero));
+  DCHECK(!reg.is(kScratchDoubleReg));
+  if (reg.code() > kDoubleRegZero.code()) {
+    return reg.code() - kNumReservedRegisters;
+  }
+  return reg.code();
+}
+
+
+DwVfpRegister DwVfpRegister::FromAllocationIndex(int index) {
+  DCHECK(index >= 0 && index < NumAllocatableRegisters());
+  DCHECK(kScratchDoubleReg.code() - kDoubleRegZero.code() ==
+         kNumReservedRegisters - 1);
+  if (index >= kDoubleRegZero.code()) {
+    return from_code(index + kNumReservedRegisters);
+  }
+  return from_code(index);
+}
+
+
 void RelocInfo::apply(intptr_t delta) {
   if (RelocInfo::IsInternalReference(rmode_)) {
     // absolute code pointer inside code object moves with the code object.
     int32_t* p = reinterpret_cast<int32_t*>(pc_);
     *p += delta;  // relocate entry
   }
   // We do not use pc relative addressing on ARM, so there is
   // nothing else to do.
 }
 
@@ skipping 552 matching lines @@
     if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
       Assembler::FlushICacheWithoutIsolate(pc, 4 * kInstrSize);
     }
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_ARM_INL_H_