Line data Source code
1 : // Copyright 2014 the V8 project authors. All rights reserved.
2 : // Use of this source code is governed by a BSD-style license that can be
3 : // found in the LICENSE file.
4 :
5 : #ifndef V8_COMPILER_REGISTER_CONFIGURATION_H_
6 : #define V8_COMPILER_REGISTER_CONFIGURATION_H_
7 :
8 : #include "src/base/macros.h"
9 : #include "src/globals.h"
10 : #include "src/machine-type.h"
11 :
12 : namespace v8 {
13 : namespace internal {
14 :
15 : // An architecture independent representation of the sets of registers available
16 : // for instruction creation.
17 : class V8_EXPORT_PRIVATE RegisterConfiguration {
18 : public:
19 : enum AliasingKind {
20 : // Registers alias a single register of every other size (e.g. Intel).
21 : OVERLAP,
22 : // Registers alias two registers of the next smaller size (e.g. ARM).
23 : COMBINE
24 : };
25 :
26 : // Architecture independent maxes.
27 : static const int kMaxGeneralRegisters = 32;
28 : static const int kMaxFPRegisters = 32;
29 :
30 : // Default RegisterConfigurations for the target architecture.
31 : // TODO(X87): This distinction in RegisterConfigurations is temporary
32 : // until x87 TF supports all of the registers that Crankshaft does.
33 : static const RegisterConfiguration* Crankshaft();
34 : static const RegisterConfiguration* Turbofan();
35 :
36 : RegisterConfiguration(int num_general_registers, int num_double_registers,
37 : int num_allocatable_general_registers,
38 : int num_allocatable_double_registers,
39 : const int* allocatable_general_codes,
40 : const int* allocatable_double_codes,
41 : AliasingKind fp_aliasing_kind,
42 : char const* const* general_names,
43 : char const* const* float_names,
44 : char const* const* double_names,
45 : char const* const* simd128_names);
46 :
47 : int num_general_registers() const { return num_general_registers_; }
48 : int num_float_registers() const { return num_float_registers_; }
49 : int num_double_registers() const { return num_double_registers_; }
50 : int num_simd128_registers() const { return num_simd128_registers_; }
51 : int num_allocatable_general_registers() const {
52 : return num_allocatable_general_registers_;
53 : }
54 : int num_allocatable_float_registers() const {
55 : return num_allocatable_float_registers_;
56 : }
57 : int num_allocatable_double_registers() const {
58 : return num_allocatable_double_registers_;
59 : }
60 : int num_allocatable_simd128_registers() const {
61 : return num_allocatable_simd128_registers_;
62 : }
63 : AliasingKind fp_aliasing_kind() const { return fp_aliasing_kind_; }
64 : int32_t allocatable_general_codes_mask() const {
65 : return allocatable_general_codes_mask_;
66 : }
67 : int32_t allocatable_double_codes_mask() const {
68 : return allocatable_double_codes_mask_;
69 : }
70 : int32_t allocatable_float_codes_mask() const {
71 : return allocatable_float_codes_mask_;
72 : }
73 : int GetAllocatableGeneralCode(int index) const {
74 40832387 : return allocatable_general_codes_[index];
75 : }
76 : bool IsAllocatableGeneralCode(int index) const {
77 34736511 : return ((1 << index) & allocatable_general_codes_mask_) != 0;
78 : }
79 : int GetAllocatableFloatCode(int index) const {
80 1277625 : return allocatable_float_codes_[index];
81 : }
82 : bool IsAllocatableFloatCode(int index) const {
83 : return ((1 << index) & allocatable_float_codes_mask_) != 0;
84 : }
85 : int GetAllocatableDoubleCode(int index) const {
86 53597504 : return allocatable_double_codes_[index];
87 : }
88 : bool IsAllocatableDoubleCode(int index) const {
89 26962038 : return ((1 << index) & allocatable_double_codes_mask_) != 0;
90 : }
91 : int GetAllocatableSimd128Code(int index) const {
92 : return allocatable_simd128_codes_[index];
93 : }
94 : bool IsAllocatableSimd128Code(int index) const {
95 : return ((1 << index) & allocatable_simd128_codes_mask_) != 0;
96 : }
97 : const char* GetGeneralRegisterName(int code) const {
98 10794693 : return general_register_names_[code];
99 : }
100 : const char* GetFloatRegisterName(int code) const {
101 0 : return float_register_names_[code];
102 : }
103 : const char* GetDoubleRegisterName(int code) const {
104 383384 : return double_register_names_[code];
105 : }
106 : const char* GetSimd128RegisterName(int code) const {
107 0 : return simd128_register_names_[code];
108 : }
109 : const int* allocatable_general_codes() const {
110 : return allocatable_general_codes_;
111 : }
112 : const int* allocatable_float_codes() const {
113 : return allocatable_float_codes_;
114 : }
115 : const int* allocatable_double_codes() const {
116 : return allocatable_double_codes_;
117 : }
118 : const int* allocatable_simd128_codes() const {
119 : return allocatable_simd128_codes_;
120 : }
121 :
122 : // Aliasing calculations for floating point registers, when fp_aliasing_kind()
123 : // is COMBINE. Currently only implemented for kFloat32, kFloat64, or kSimd128
124 : // reps. Returns the number of aliases, and if > 0, alias_base_index is set to
125 : // the index of the first alias.
126 : int GetAliases(MachineRepresentation rep, int index,
127 : MachineRepresentation other_rep, int* alias_base_index) const;
128 : // Returns a value indicating whether two registers alias each other, when
129 : // fp_aliasing_kind() is COMBINE. Currently implemented for kFloat32,
130 : // kFloat64, or kSimd128 reps.
131 : bool AreAliases(MachineRepresentation rep, int index,
132 : MachineRepresentation other_rep, int other_index) const;
133 :
134 : private:
135 : const int num_general_registers_;
136 : int num_float_registers_;
137 : const int num_double_registers_;
138 : int num_simd128_registers_;
139 : int num_allocatable_general_registers_;
140 : int num_allocatable_float_registers_;
141 : int num_allocatable_double_registers_;
142 : int num_allocatable_simd128_registers_;
143 : int32_t allocatable_general_codes_mask_;
144 : int32_t allocatable_float_codes_mask_;
145 : int32_t allocatable_double_codes_mask_;
146 : int32_t allocatable_simd128_codes_mask_;
147 : const int* allocatable_general_codes_;
148 : int allocatable_float_codes_[kMaxFPRegisters];
149 : const int* allocatable_double_codes_;
150 : int allocatable_simd128_codes_[kMaxFPRegisters];
151 : AliasingKind fp_aliasing_kind_;
152 : char const* const* general_register_names_;
153 : char const* const* float_register_names_;
154 : char const* const* double_register_names_;
155 : char const* const* simd128_register_names_;
156 : };
157 :
158 : } // namespace internal
159 : } // namespace v8
160 :
161 : #endif // V8_COMPILER_REGISTER_CONFIGURATION_H_
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