Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 1 | // Copyright 2011 Google Inc. All Rights Reserved. |
| 2 | |
Brian Carlstrom | 578bbdc | 2011-07-21 14:07:47 -0700 | [diff] [blame] | 3 | #include "globals.h" |
| 4 | #include "calling_convention.h" |
| 5 | #include "managed_register.h" |
Ian Rogers | b033c75 | 2011-07-20 12:22:35 -0700 | [diff] [blame] | 6 | |
| 7 | namespace art { |
| 8 | |
| 9 | // We need all registers for caching of locals. |
| 10 | // Register R9 .. R15 are reserved. |
| 11 | static const int kNumberOfAvailableCoreRegisters = (R8 - R0) + 1; |
| 12 | static const int kNumberOfAvailableSRegisters = kNumberOfSRegisters; |
| 13 | static const int kNumberOfAvailableDRegisters = kNumberOfDRegisters; |
| 14 | static const int kNumberOfAvailableOverlappingDRegisters = |
| 15 | kNumberOfOverlappingDRegisters; |
| 16 | static const int kNumberOfAvailableRegisterPairs = kNumberOfRegisterPairs; |
| 17 | |
| 18 | |
| 19 | // Returns true if this managed-register overlaps the other managed-register. |
| 20 | bool ManagedRegister::Overlaps(const ManagedRegister& other) const { |
| 21 | if (IsNoRegister() || other.IsNoRegister()) return false; |
| 22 | if (Equals(other)) return true; |
| 23 | if (IsRegisterPair()) { |
| 24 | Register low = AsRegisterPairLow(); |
| 25 | Register high = AsRegisterPairHigh(); |
| 26 | return ManagedRegister::FromCoreRegister(low).Overlaps(other) || |
| 27 | ManagedRegister::FromCoreRegister(high).Overlaps(other); |
| 28 | } |
| 29 | if (IsOverlappingDRegister()) { |
| 30 | if (other.IsDRegister()) return Equals(other); |
| 31 | if (other.IsSRegister()) { |
| 32 | SRegister low = AsOverlappingDRegisterLow(); |
| 33 | SRegister high = AsOverlappingDRegisterHigh(); |
| 34 | SRegister other_sreg = other.AsSRegister(); |
| 35 | return (low == other_sreg) || (high == other_sreg); |
| 36 | } |
| 37 | return false; |
| 38 | } |
| 39 | if (other.IsRegisterPair() || other.IsOverlappingDRegister()) { |
| 40 | return other.Overlaps(*this); |
| 41 | } |
| 42 | return false; |
| 43 | } |
| 44 | |
| 45 | |
| 46 | int ManagedRegister::AllocIdLow() const { |
| 47 | CHECK(IsOverlappingDRegister() || IsRegisterPair()); |
| 48 | const int r = RegId() - (kNumberOfCoreRegIds + kNumberOfSRegIds); |
| 49 | int low; |
| 50 | if (r < kNumberOfOverlappingDRegIds) { |
| 51 | CHECK(IsOverlappingDRegister()); |
| 52 | low = (r * 2) + kNumberOfCoreRegIds; // Return a SRegister. |
| 53 | } else { |
| 54 | CHECK(IsRegisterPair()); |
| 55 | low = (r - kNumberOfDRegIds) * 2; // Return a Register. |
| 56 | } |
| 57 | return low; |
| 58 | } |
| 59 | |
| 60 | |
| 61 | int ManagedRegister::AllocIdHigh() const { |
| 62 | return AllocIdLow() + 1; |
| 63 | } |
| 64 | |
| 65 | |
| 66 | void ManagedRegister::Print(std::ostream& os) const { |
| 67 | if (!IsValidManagedRegister()) { |
| 68 | os << "No Register"; |
| 69 | } else if (IsCoreRegister()) { |
| 70 | os << "Core: " << static_cast<int>(AsCoreRegister()); |
| 71 | } else if (IsRegisterPair()) { |
| 72 | os << "Pair: " << static_cast<int>(AsRegisterPairLow()) << ", " |
| 73 | << static_cast<int>(AsRegisterPairHigh()); |
| 74 | } else if (IsSRegister()) { |
| 75 | os << "SRegister: " << static_cast<int>(AsSRegister()); |
| 76 | } else if (IsDRegister()) { |
| 77 | os << "DRegister: " << static_cast<int>(AsDRegister()); |
| 78 | } else { |
| 79 | os << "??: " << RegId(); |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | std::ostream& operator<<(std::ostream& os, const ManagedRegister& reg) { |
| 84 | reg.Print(os); |
| 85 | return os; |
| 86 | } |
| 87 | |
| 88 | std::ostream& operator<<(std::ostream& os, const RegisterPair& r) { |
| 89 | os << ManagedRegister::FromRegisterPair(r); |
| 90 | return os; |
| 91 | } |
| 92 | |
| 93 | } // namespace art |