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// 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/macros.h"
#include "src/globals.h"
#include "src/machine-type.h"
namespace v8 {
namespace internal {
// An architecture independent representation of the sets of registers available
// for instruction creation.
class V8_EXPORT_PRIVATE RegisterConfiguration {
enum AliasingKind {
// Registers alias a single register of every other size (e.g. Intel).
// Registers alias two registers of the next smaller size (e.g. ARM).
// Architecture independent maxes.
static const int kMaxGeneralRegisters = 32;
static const int kMaxFPRegisters = 32;
// Default RegisterConfigurations for the target architecture.
// TODO(X87): This distinction in RegisterConfigurations is temporary
// until x87 TF supports all of the registers that Crankshaft does.
static const RegisterConfiguration* Crankshaft();
static const RegisterConfiguration* Turbofan();
RegisterConfiguration(int num_general_registers, int num_double_registers,
int num_allocatable_general_registers,
int num_allocatable_double_registers,
const int* allocatable_general_codes,
const int* allocatable_double_codes,
AliasingKind fp_aliasing_kind,
char const* const* general_names,
char const* const* float_names,
char const* const* double_names,
char const* const* simd128_names);
int num_general_registers() const { return num_general_registers_; }
int num_float_registers() const { return num_float_registers_; }
int num_double_registers() const { return num_double_registers_; }
int num_simd128_registers() const { return num_simd128_registers_; }
int num_allocatable_general_registers() const {
return num_allocatable_general_registers_;
int num_allocatable_float_registers() const {
return num_allocatable_float_registers_;
int num_allocatable_double_registers() const {
return num_allocatable_double_registers_;
int num_allocatable_simd128_registers() const {
return num_allocatable_simd128_registers_;
AliasingKind fp_aliasing_kind() const { return fp_aliasing_kind_; }
int32_t allocatable_general_codes_mask() const {
return allocatable_general_codes_mask_;
int32_t allocatable_double_codes_mask() const {
return allocatable_double_codes_mask_;
int GetAllocatableGeneralCode(int index) const {
return allocatable_general_codes_[index];
bool IsAllocatableGeneralCode(int index) const {
return ((1 << index) & allocatable_general_codes_mask_) != 0;
int GetAllocatableFloatCode(int index) const {
return allocatable_float_codes_[index];
bool IsAllocatableFloatCode(int index) const {
return ((1 << index) & allocatable_float_codes_mask_) != 0;
int GetAllocatableDoubleCode(int index) const {
return allocatable_double_codes_[index];
bool IsAllocatableDoubleCode(int index) const {
return ((1 << index) & allocatable_double_codes_mask_) != 0;
int GetAllocatableSimd128Code(int index) const {
return allocatable_simd128_codes_[index];
bool IsAllocatableSimd128Code(int index) const {
return ((1 << index) & allocatable_simd128_codes_mask_) != 0;
const char* GetGeneralRegisterName(int code) const {
return general_register_names_[code];
const char* GetFloatRegisterName(int code) const {
return float_register_names_[code];
const char* GetDoubleRegisterName(int code) const {
return double_register_names_[code];
const char* GetSimd128RegisterName(int code) const {
return simd128_register_names_[code];
const int* allocatable_general_codes() const {
return allocatable_general_codes_;
const int* allocatable_float_codes() const {
return allocatable_float_codes_;
const int* allocatable_double_codes() const {
return allocatable_double_codes_;
const int* allocatable_simd128_codes() const {
return allocatable_simd128_codes_;
// Aliasing calculations for floating point registers, when fp_aliasing_kind()
// is COMBINE. Currently only implemented for kFloat32, kFloat64, or kSimd128
// reps. Returns the number of aliases, and if > 0, alias_base_index is set to
// the index of the first alias.
int GetAliases(MachineRepresentation rep, int index,
MachineRepresentation other_rep, int* alias_base_index) const;
// Returns a value indicating whether two registers alias each other, when
// fp_aliasing_kind() is COMBINE. Currently implemented for kFloat32,
// kFloat64, or kSimd128 reps.
bool AreAliases(MachineRepresentation rep, int index,
MachineRepresentation other_rep, int other_index) const;
const int num_general_registers_;
int num_float_registers_;
const int num_double_registers_;
int num_simd128_registers_;
int num_allocatable_general_registers_;
int num_allocatable_float_registers_;
int num_allocatable_double_registers_;
int num_allocatable_simd128_registers_;
int32_t allocatable_general_codes_mask_;
int32_t allocatable_float_codes_mask_;
int32_t allocatable_double_codes_mask_;
int32_t allocatable_simd128_codes_mask_;
const int* allocatable_general_codes_;
int allocatable_float_codes_[kMaxFPRegisters];
const int* allocatable_double_codes_;
int allocatable_simd128_codes_[kMaxFPRegisters];
AliasingKind fp_aliasing_kind_;
char const* const* general_register_names_;
char const* const* float_register_names_;
char const* const* double_register_names_;
char const* const* simd128_register_names_;
} // namespace internal
} // namespace v8