Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 1 | // Copyright 2011 Google Inc. All Rights Reserved. |
| 2 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 3 | #include "managed_register_x86.h" |
| 4 | |
Brian Carlstrom | 578bbdc | 2011-07-21 14:07:47 -0700 | [diff] [blame] | 5 | #include "globals.h" |
| 6 | #include "calling_convention.h" |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 7 | |
| 8 | namespace art { |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 9 | namespace x86 { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 10 | |
| 11 | // These cpu registers are never available for allocation. |
| 12 | static const Register kReservedCpuRegistersArray[] = { EBP, ESP }; |
| 13 | |
| 14 | |
| 15 | // We reduce the number of available registers for allocation in debug-code |
| 16 | // mode in order to increase register pressure. |
| 17 | |
| 18 | // We need all registers for caching. |
| 19 | static const int kNumberOfAvailableCpuRegisters = kNumberOfCpuRegisters; |
| 20 | static const int kNumberOfAvailableXmmRegisters = kNumberOfXmmRegisters; |
| 21 | static const int kNumberOfAvailableRegisterPairs = kNumberOfRegisterPairs; |
| 22 | |
| 23 | |
| 24 | // Define register pairs. |
| 25 | // This list must be kept in sync with the RegisterPair enum. |
| 26 | #define REGISTER_PAIR_LIST(P) \ |
| 27 | P(EAX, EDX) \ |
| 28 | P(EAX, ECX) \ |
| 29 | P(EAX, EBX) \ |
| 30 | P(EAX, EDI) \ |
| 31 | P(EDX, ECX) \ |
| 32 | P(EDX, EBX) \ |
| 33 | P(EDX, EDI) \ |
| 34 | P(ECX, EBX) \ |
| 35 | P(ECX, EDI) \ |
| 36 | P(EBX, EDI) |
| 37 | |
| 38 | |
| 39 | struct RegisterPairDescriptor { |
| 40 | RegisterPair reg; // Used to verify that the enum is in sync. |
| 41 | Register low; |
| 42 | Register high; |
| 43 | }; |
| 44 | |
| 45 | |
| 46 | static const RegisterPairDescriptor kRegisterPairs[] = { |
| 47 | #define REGISTER_PAIR_ENUMERATION(low, high) { low##_##high, low, high }, |
| 48 | REGISTER_PAIR_LIST(REGISTER_PAIR_ENUMERATION) |
| 49 | #undef REGISTER_PAIR_ENUMERATION |
| 50 | }; |
| 51 | |
| 52 | std::ostream& operator<<(std::ostream& os, const RegisterPair& reg) { |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 53 | os << X86ManagedRegister::FromRegisterPair(reg); |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 54 | return os; |
| 55 | } |
| 56 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 57 | bool X86ManagedRegister::Overlaps(const X86ManagedRegister& other) const { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 58 | if (IsNoRegister() || other.IsNoRegister()) return false; |
| 59 | CHECK(IsValidManagedRegister()); |
| 60 | CHECK(other.IsValidManagedRegister()); |
| 61 | if (Equals(other)) return true; |
| 62 | if (IsRegisterPair()) { |
| 63 | Register low = AsRegisterPairLow(); |
| 64 | Register high = AsRegisterPairHigh(); |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 65 | return X86ManagedRegister::FromCpuRegister(low).Overlaps(other) || |
| 66 | X86ManagedRegister::FromCpuRegister(high).Overlaps(other); |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 67 | } |
| 68 | if (other.IsRegisterPair()) { |
| 69 | return other.Overlaps(*this); |
| 70 | } |
| 71 | return false; |
| 72 | } |
| 73 | |
| 74 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 75 | int X86ManagedRegister::AllocIdLow() const { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 76 | CHECK(IsRegisterPair()); |
| 77 | const int r = RegId() - (kNumberOfCpuRegIds + kNumberOfXmmRegIds + |
| 78 | kNumberOfX87RegIds); |
| 79 | CHECK_EQ(r, kRegisterPairs[r].reg); |
| 80 | return kRegisterPairs[r].low; |
| 81 | } |
| 82 | |
| 83 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 84 | int X86ManagedRegister::AllocIdHigh() const { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 85 | CHECK(IsRegisterPair()); |
| 86 | const int r = RegId() - (kNumberOfCpuRegIds + kNumberOfXmmRegIds + |
| 87 | kNumberOfX87RegIds); |
| 88 | CHECK_EQ(r, kRegisterPairs[r].reg); |
| 89 | return kRegisterPairs[r].high; |
| 90 | } |
| 91 | |
| 92 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 93 | void X86ManagedRegister::Print(std::ostream& os) const { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 94 | if (!IsValidManagedRegister()) { |
| 95 | os << "No Register"; |
| 96 | } else if (IsXmmRegister()) { |
| 97 | os << "XMM: " << static_cast<int>(AsXmmRegister()); |
| 98 | } else if (IsX87Register()) { |
| 99 | os << "X87: " << static_cast<int>(AsX87Register()); |
| 100 | } else if (IsCpuRegister()) { |
| 101 | os << "CPU: " << static_cast<int>(AsCpuRegister()); |
| 102 | } else if (IsRegisterPair()) { |
| 103 | os << "Pair: " << AsRegisterPairLow() << ", " << AsRegisterPairHigh(); |
| 104 | } else { |
| 105 | os << "??: " << RegId(); |
| 106 | } |
| 107 | } |
| 108 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 109 | std::ostream& operator<<(std::ostream& os, const X86ManagedRegister& reg) { |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 110 | reg.Print(os); |
| 111 | return os; |
| 112 | } |
| 113 | |
Ian Rogers | 2c8f653 | 2011-09-02 17:16:34 -0700 | [diff] [blame] | 114 | } // namespace x86 |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 115 | } // namespace art |