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 kNumberOfAvailableXRegisters = (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  return (IsGPRegister() == other.IsGPRegister()) && (RegNo() == other.RegNo());
46}
47
48int Arm64ManagedRegister::RegNo() const {
49  CHECK(!IsNoRegister());
50  int no;
51  if (IsXRegister()) {
52    no = static_cast<int>(AsXRegister());
53  } else if (IsWRegister()) {
54    no = static_cast<int>(AsWRegister());
55  } else if (IsDRegister()) {
56    no = static_cast<int>(AsDRegister());
57  } else if (IsSRegister()) {
58    no = static_cast<int>(AsSRegister());
59  } else {
60    no = kNoRegister;
61  }
62  return no;
63}
64
65int Arm64ManagedRegister::RegIdLow() const {
66  CHECK(IsXRegister() || IsDRegister());
67  int low = RegNo();
68  if (IsXRegister()) {
69    low += kNumberOfXRegIds;
70  } else if (IsDRegister()) {
71    low += kNumberOfXRegIds + kNumberOfWRegIds + kNumberOfDRegIds;
72  }
73  return low;
74}
75
76// FIXME: Find better naming.
77int Arm64ManagedRegister::RegIdHigh() const {
78  CHECK(IsWRegister() || IsSRegister());
79  int high = RegNo();
80  if (IsSRegister()) {
81    high += kNumberOfXRegIds + kNumberOfWRegIds;
82  }
83  return high;
84}
85
86void Arm64ManagedRegister::Print(std::ostream& os) const {
87  if (!IsValidManagedRegister()) {
88    os << "No Register";
89  } else if (IsXRegister()) {
90    os << "XCore: " << static_cast<int>(AsXRegister());
91  } else if (IsWRegister()) {
92    os << "WCore: " << static_cast<int>(AsWRegister());
93  } else if (IsDRegister()) {
94    os << "DRegister: " << static_cast<int>(AsDRegister());
95  } else if (IsSRegister()) {
96    os << "SRegister: " << static_cast<int>(AsSRegister());
97  } else {
98    os << "??: " << RegId();
99  }
100}
101
102std::ostream& operator<<(std::ostream& os, const Arm64ManagedRegister& reg) {
103  reg.Print(os);
104  return os;
105}
106
107}  // namespace arm64
108}  // namespace art
109