1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "managed_register_arm64.h"
18#include "globals.h"
19
20namespace art {
21namespace arm64 {
22
23// TODO: Define convention
24//
25// Do not use APCS callee saved regs for now. Use:
26//  * [X0, X15]
27//  * [W0, W15]
28//  * [D0, D31]
29//  * [S0, S31]
30// static const int kNumberOfAvailableCoreRegisters = (X15 - X0) + 1;
31// static const int kNumberOfAvailableWRegisters = (W15 - W0) + 1;
32// static const int kNumberOfAvailableDRegisters = kNumberOfDRegisters;
33// static const int kNumberOfAvailableSRegisters = kNumberOfSRegisters;
34
35// Returns true if this managed-register overlaps the other managed-register.
36// GP Register Bank:
37//       31____0 W[n]
38// 63__________0 X[n]
39//
40// FP Register Bank:
41//       31____0 S[n]
42// 63__________0 D[n]
43bool Arm64ManagedRegister::Overlaps(const Arm64ManagedRegister& other) const {
44  if (IsNoRegister() || other.IsNoRegister()) return false;
45  if ((IsGPRegister() && other.IsGPRegister()) ||
46      (IsFPRegister() && other.IsFPRegister())) {
47    return (RegNo() == other.RegNo());
48  }
49  return false;
50}
51
52int Arm64ManagedRegister::RegNo() const {
53  CHECK(!IsNoRegister());
54  int no;
55  if (IsCoreRegister()) {
56    if (IsZeroRegister()) {
57      no = static_cast<int>(X31);
58    } else {
59      no = static_cast<int>(AsCoreRegister());
60    }
61  } else if (IsWRegister()) {
62    no = static_cast<int>(AsWRegister());
63  } else if (IsDRegister()) {
64    no = static_cast<int>(AsDRegister());
65  } else if (IsSRegister()) {
66    no = static_cast<int>(AsSRegister());
67  } else {
68    no = kNoRegister;
69  }
70  return no;
71}
72
73int Arm64ManagedRegister::RegIdLow() const {
74  CHECK(IsCoreRegister() || IsDRegister());
75  int low = RegNo();
76  if (IsCoreRegister()) {
77    low += kNumberOfCoreRegIds;
78  } else if (IsDRegister()) {
79    low += kNumberOfCoreRegIds + kNumberOfWRegIds + kNumberOfDRegIds;
80  }
81  return low;
82}
83
84// FIXME: Find better naming.
85int Arm64ManagedRegister::RegIdHigh() const {
86  CHECK(IsWRegister() || IsSRegister());
87  int high = RegNo();
88  if (IsSRegister()) {
89    high += kNumberOfCoreRegIds + kNumberOfWRegIds;
90  }
91  return high;
92}
93
94void Arm64ManagedRegister::Print(std::ostream& os) const {
95  if (!IsValidManagedRegister()) {
96    os << "No Register";
97  } else if (IsCoreRegister()) {
98    os << "XCore: " << static_cast<int>(AsCoreRegister());
99  } else if (IsWRegister()) {
100    os << "WCore: " << static_cast<int>(AsWRegister());
101  } else if (IsDRegister()) {
102    os << "DRegister: " << static_cast<int>(AsDRegister());
103  } else if (IsSRegister()) {
104    os << "SRegister: " << static_cast<int>(AsSRegister());
105  } else {
106    os << "??: " << RegId();
107  }
108}
109
110std::ostream& operator<<(std::ostream& os, const Arm64ManagedRegister& reg) {
111  reg.Print(os);
112  return os;
113}
114
115}  // namespace arm64
116}  // namespace art
117