1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
//===-- MipsSERegisterInfo.cpp - MIPS32/64 Register Information -== -------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the MIPS32/64 implementation of the TargetRegisterInfo
// class.
//
//===----------------------------------------------------------------------===//
#include "MipsSERegisterInfo.h"
#include "Mips.h"
#include "MipsAnalyzeImmediate.h"
#include "MipsMachineFunction.h"
#include "MipsSEInstrInfo.h"
#include "MipsSubtarget.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/DebugInfo.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Type.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetFrameLowering.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
MipsSERegisterInfo::MipsSERegisterInfo(const MipsSubtarget &ST)
: MipsRegisterInfo(ST) {}
bool MipsSERegisterInfo::
requiresRegisterScavenging(const MachineFunction &MF) const {
return true;
}
bool MipsSERegisterInfo::
requiresFrameIndexScavenging(const MachineFunction &MF) const {
return true;
}
const TargetRegisterClass *
MipsSERegisterInfo::intRegClass(unsigned Size) const {
if (Size == 4)
return &Mips::GPR32RegClass;
assert(Size == 8);
return &Mips::GPR64RegClass;
}
/// Determine whether a given opcode is an MSA load/store (supporting 10-bit
/// offsets) or a non-MSA load/store (supporting 16-bit offsets).
static inline bool isMSALoadOrStore(const unsigned Opcode) {
switch (Opcode) {
case Mips::LD_B:
case Mips::LD_H:
case Mips::LD_W:
case Mips::LD_D:
case Mips::ST_B:
case Mips::ST_H:
case Mips::ST_W:
case Mips::ST_D:
return true;
default:
return false;
}
}
void MipsSERegisterInfo::eliminateFI(MachineBasicBlock::iterator II,
unsigned OpNo, int FrameIndex,
uint64_t StackSize,
int64_t SPOffset) const {
MachineInstr &MI = *II;
MachineFunction &MF = *MI.getParent()->getParent();
MachineFrameInfo *MFI = MF.getFrameInfo();
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
int MinCSFI = 0;
int MaxCSFI = -1;
if (CSI.size()) {
MinCSFI = CSI[0].getFrameIdx();
MaxCSFI = CSI[CSI.size() - 1].getFrameIdx();
}
bool EhDataRegFI = MipsFI->isEhDataRegFI(FrameIndex);
// The following stack frame objects are always referenced relative to $sp:
// 1. Outgoing arguments.
// 2. Pointer to dynamically allocated stack space.
// 3. Locations for callee-saved registers.
// 4. Locations for eh data registers.
// Everything else is referenced relative to whatever register
// getFrameRegister() returns.
unsigned FrameReg;
if ((FrameIndex >= MinCSFI && FrameIndex <= MaxCSFI) || EhDataRegFI)
FrameReg = Subtarget.isABI_N64() ? Mips::SP_64 : Mips::SP;
else
FrameReg = getFrameRegister(MF);
// Calculate final offset.
// - There is no need to change the offset if the frame object is one of the
// following: an outgoing argument, pointer to a dynamically allocated
// stack space or a $gp restore location,
// - If the frame object is any of the following, its offset must be adjusted
// by adding the size of the stack:
// incoming argument, callee-saved register location or local variable.
bool IsKill = false;
int64_t Offset;
Offset = SPOffset + (int64_t)StackSize;
Offset += MI.getOperand(OpNo + 1).getImm();
DEBUG(errs() << "Offset : " << Offset << "\n" << "<--------->\n");
if (!MI.isDebugValue()) {
// Make sure Offset fits within the field available.
// For MSA instructions, this is a 10-bit signed immediate, otherwise it is
// a 16-bit signed immediate.
unsigned OffsetBitSize = isMSALoadOrStore(MI.getOpcode()) ? 10 : 16;
if (OffsetBitSize == 10 && !isInt<10>(Offset) && isInt<16>(Offset)) {
// If we have an offset that needs to fit into a signed 10-bit immediate
// and doesn't, but does fit into 16-bits then use an ADDiu
MachineBasicBlock &MBB = *MI.getParent();
DebugLoc DL = II->getDebugLoc();
unsigned ADDiu = Subtarget.isABI_N64() ? Mips::DADDiu : Mips::ADDiu;
const TargetRegisterClass *RC =
Subtarget.isABI_N64() ? &Mips::GPR64RegClass : &Mips::GPR32RegClass;
MachineRegisterInfo &RegInfo = MBB.getParent()->getRegInfo();
unsigned Reg = RegInfo.createVirtualRegister(RC);
const MipsSEInstrInfo &TII =
*static_cast<const MipsSEInstrInfo *>(
MBB.getParent()->getTarget().getInstrInfo());
BuildMI(MBB, II, DL, TII.get(ADDiu), Reg).addReg(FrameReg).addImm(Offset);
FrameReg = Reg;
Offset = 0;
IsKill = true;
} else if (!isInt<16>(Offset)) {
// Otherwise split the offset into 16-bit pieces and add it in multiple
// instructions.
MachineBasicBlock &MBB = *MI.getParent();
DebugLoc DL = II->getDebugLoc();
unsigned ADDu = Subtarget.isABI_N64() ? Mips::DADDu : Mips::ADDu;
unsigned NewImm = 0;
const MipsSEInstrInfo &TII =
*static_cast<const MipsSEInstrInfo *>(
MBB.getParent()->getTarget().getInstrInfo());
unsigned Reg = TII.loadImmediate(Offset, MBB, II, DL,
OffsetBitSize == 16 ? &NewImm : NULL);
BuildMI(MBB, II, DL, TII.get(ADDu), Reg).addReg(FrameReg)
.addReg(Reg, RegState::Kill);
FrameReg = Reg;
Offset = SignExtend64<16>(NewImm);
IsKill = true;
}
}
MI.getOperand(OpNo).ChangeToRegister(FrameReg, false, false, IsKill);
MI.getOperand(OpNo + 1).ChangeToImmediate(Offset);
}
|
