[Turbofan] Add concept of FP register aliasing on ARM 32.

src/register-configuration.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/register-configuration.h"
 #include "src/globals.h"
 #include "src/macro-assembler.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 52 matching lines @@
 enum CompilerSelector { CRANKSHAFT, TURBOFAN };
 
 class ArchDefaultRegisterConfiguration : public RegisterConfiguration {
  public:
   explicit ArchDefaultRegisterConfiguration(CompilerSelector compiler)
       : RegisterConfiguration(
             Register::kNumRegisters, DoubleRegister::kMaxNumRegisters,
 #if V8_TARGET_ARCH_IA32
             kMaxAllocatableGeneralRegisterCount,
             kMaxAllocatableDoubleRegisterCount,
-            kMaxAllocatableDoubleRegisterCount,
 #elif V8_TARGET_ARCH_X87
             kMaxAllocatableGeneralRegisterCount,
             compiler == TURBOFAN ? 1 : kMaxAllocatableDoubleRegisterCount,
-            compiler == TURBOFAN ? 1 : kMaxAllocatableDoubleRegisterCount,
 #elif V8_TARGET_ARCH_X64
             kMaxAllocatableGeneralRegisterCount,
             kMaxAllocatableDoubleRegisterCount,
-            kMaxAllocatableDoubleRegisterCount,
 #elif V8_TARGET_ARCH_ARM
             FLAG_enable_embedded_constant_pool
                 ? (kMaxAllocatableGeneralRegisterCount - 1)
                 : kMaxAllocatableGeneralRegisterCount,
             CpuFeatures::IsSupported(VFP32DREGS)
                 ? kMaxAllocatableDoubleRegisterCount
                 : (ALLOCATABLE_NO_VFP32_DOUBLE_REGISTERS(REGISTER_COUNT) 0),
-            ALLOCATABLE_NO_VFP32_DOUBLE_REGISTERS(REGISTER_COUNT) 0,
 #elif V8_TARGET_ARCH_ARM64
             kMaxAllocatableGeneralRegisterCount,
             kMaxAllocatableDoubleRegisterCount,
-            kMaxAllocatableDoubleRegisterCount,
 #elif V8_TARGET_ARCH_MIPS
             kMaxAllocatableGeneralRegisterCount,
             kMaxAllocatableDoubleRegisterCount,
-            kMaxAllocatableDoubleRegisterCount,
 #elif V8_TARGET_ARCH_MIPS64
             kMaxAllocatableGeneralRegisterCount,
             kMaxAllocatableDoubleRegisterCount,
-            kMaxAllocatableDoubleRegisterCount,
 #elif V8_TARGET_ARCH_PPC
             kMaxAllocatableGeneralRegisterCount,
             kMaxAllocatableDoubleRegisterCount,
-            kMaxAllocatableDoubleRegisterCount,
 #elif V8_TARGET_ARCH_S390
             kMaxAllocatableGeneralRegisterCount,
             kMaxAllocatableDoubleRegisterCount,
-            kMaxAllocatableDoubleRegisterCount,
 #else
 #error Unsupported target architecture.
 #endif
             kAllocatableGeneralCodes, kAllocatableDoubleCodes,
             kSimpleFPAliasing ? AliasingKind::OVERLAP : AliasingKind::COMBINE,
             kGeneralRegisterNames, kFloatRegisterNames, kDoubleRegisterNames,
             kSimd128RegisterNames) {
   }
 };
 
@@ skipping 18 matching lines @@
   return &kDefaultRegisterConfigurationForCrankshaft.Get();
 }
 
 const RegisterConfiguration* RegisterConfiguration::Turbofan() {
   return &kDefaultRegisterConfigurationForTurboFan.Get();
 }
 
 RegisterConfiguration::RegisterConfiguration(
     int num_general_registers, int num_double_registers,
     int num_allocatable_general_registers, int num_allocatable_double_registers,
-    int num_allocatable_aliased_double_registers,
     const int* allocatable_general_codes, const int* allocatable_double_codes,
     AliasingKind fp_aliasing_kind, const char* const* general_register_names,
     const char* const* float_register_names,
     const char* const* double_register_names,
     const char* const* simd128_register_names)
     : num_general_registers_(num_general_registers),
       num_float_registers_(0),
       num_double_registers_(num_double_registers),
       num_simd128_registers_(0),
       num_allocatable_general_registers_(num_allocatable_general_registers),
       num_allocatable_float_registers_(0),
       num_allocatable_double_registers_(num_allocatable_double_registers),
-      num_allocatable_aliased_double_registers_(
-          num_allocatable_aliased_double_registers),
       num_allocatable_simd128_registers_(0),
       allocatable_general_codes_mask_(0),
       allocatable_float_codes_mask_(0),
       allocatable_double_codes_mask_(0),
       allocatable_simd128_codes_mask_(0),
       allocatable_general_codes_(allocatable_general_codes),
       allocatable_double_codes_(allocatable_double_codes),
       fp_aliasing_kind_(fp_aliasing_kind),
       general_register_names_(general_register_names),
       float_register_names_(float_register_names),
@@ skipping 96 matching lines @@
     return index == other_index >> shift;
   }
   int shift = other_rep_int - rep_int;
   return index >> shift == other_index;
 }
 
 #undef REGISTER_COUNT
 
 }  // namespace internal
 }  // namespace v8