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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "managed_register_arm.h"
#include "globals.h"
namespace art {
namespace arm {
// We need all registers for caching of locals.
// Register R9 .. R15 are reserved.
static const int kNumberOfAvailableCoreRegisters = (R8 - R0) + 1;
static const int kNumberOfAvailableSRegisters = kNumberOfSRegisters;
static const int kNumberOfAvailableDRegisters = kNumberOfDRegisters;
static const int kNumberOfAvailableOverlappingDRegisters =
kNumberOfOverlappingDRegisters;
static const int kNumberOfAvailableRegisterPairs = kNumberOfRegisterPairs;
// Returns true if this managed-register overlaps the other managed-register.
bool ArmManagedRegister::Overlaps(const ArmManagedRegister& other) const {
if (IsNoRegister() || other.IsNoRegister()) return false;
if (Equals(other)) return true;
if (IsRegisterPair()) {
Register low = AsRegisterPairLow();
Register high = AsRegisterPairHigh();
return ArmManagedRegister::FromCoreRegister(low).Overlaps(other) ||
ArmManagedRegister::FromCoreRegister(high).Overlaps(other);
}
if (IsOverlappingDRegister()) {
if (other.IsDRegister()) return Equals(other);
if (other.IsSRegister()) {
SRegister low = AsOverlappingDRegisterLow();
SRegister high = AsOverlappingDRegisterHigh();
SRegister other_sreg = other.AsSRegister();
return (low == other_sreg) || (high == other_sreg);
}
return false;
}
if (other.IsRegisterPair() || other.IsOverlappingDRegister()) {
return other.Overlaps(*this);
}
return false;
}
int ArmManagedRegister::AllocIdLow() const {
CHECK(IsOverlappingDRegister() || IsRegisterPair());
const int r = RegId() - (kNumberOfCoreRegIds + kNumberOfSRegIds);
int low;
if (r < kNumberOfOverlappingDRegIds) {
CHECK(IsOverlappingDRegister());
low = (r * 2) + kNumberOfCoreRegIds; // Return a SRegister.
} else {
CHECK(IsRegisterPair());
low = (r - kNumberOfDRegIds) * 2; // Return a Register.
if (low > 6) {
// we didn't got a pair higher than R6_R7, must be the dalvik special case
low = 1;
}
}
return low;
}
int ArmManagedRegister::AllocIdHigh() const {
return AllocIdLow() + 1;
}
void ArmManagedRegister::Print(std::ostream& os) const {
if (!IsValidManagedRegister()) {
os << "No Register";
} else if (IsCoreRegister()) {
os << "Core: " << static_cast<int>(AsCoreRegister());
} else if (IsRegisterPair()) {
os << "Pair: " << static_cast<int>(AsRegisterPairLow()) << ", "
<< static_cast<int>(AsRegisterPairHigh());
} else if (IsSRegister()) {
os << "SRegister: " << static_cast<int>(AsSRegister());
} else if (IsDRegister()) {
os << "DRegister: " << static_cast<int>(AsDRegister());
} else {
os << "??: " << RegId();
}
}
std::ostream& operator<<(std::ostream& os, const ArmManagedRegister& reg) {
reg.Print(os);
return os;
}
std::ostream& operator<<(std::ostream& os, const RegisterPair& r) {
os << ArmManagedRegister::FromRegisterPair(r);
return os;
}
} // namespace arm
} // namespace art
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