1 //===-- SparcRegisterInfo.cpp - SPARC Register Information ----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the SPARC implementation of the TargetRegisterInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "SparcRegisterInfo.h"
16 #include "SparcMachineFunctionInfo.h"
17 #include "SparcSubtarget.h"
18 #include "llvm/ADT/BitVector.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/CodeGen/MachineFrameInfo.h"
21 #include "llvm/CodeGen/MachineFunction.h"
22 #include "llvm/CodeGen/MachineInstrBuilder.h"
23 #include "llvm/IR/Type.h"
24 #include "llvm/Support/CommandLine.h"
25 #include "llvm/Support/ErrorHandling.h"
26 #include "llvm/Target/TargetInstrInfo.h"
28 #define GET_REGINFO_TARGET_DESC
29 #include "SparcGenRegisterInfo.inc"
34 ReserveAppRegisters("sparc-reserve-app-registers", cl::Hidden, cl::init(false),
35 cl::desc("Reserve application registers (%g2-%g4)"));
37 SparcRegisterInfo::SparcRegisterInfo(SparcSubtarget &st)
38 : SparcGenRegisterInfo(SP::I7), Subtarget(st) {
41 const uint16_t* SparcRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF)
47 SparcRegisterInfo::getCallPreservedMask(CallingConv::ID CC) const {
51 BitVector SparcRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
52 BitVector Reserved(getNumRegs());
53 // FIXME: G1 reserved for now for large imm generation by frame code.
56 // G1-G4 can be used in applications.
57 if (ReserveAppRegisters) {
62 // G5 is not reserved in 64 bit mode.
63 if (!Subtarget.is64Bit())
73 // Unaliased double registers are not available in non-V9 targets.
74 if (!Subtarget.isV9()) {
75 for (unsigned n = 0; n != 16; ++n) {
76 for (MCRegAliasIterator AI(SP::D16 + n, this, true); AI.isValid(); ++AI)
84 const TargetRegisterClass*
85 SparcRegisterInfo::getPointerRegClass(const MachineFunction &MF,
86 unsigned Kind) const {
87 return Subtarget.is64Bit() ? &SP::I64RegsRegClass : &SP::IntRegsRegClass;
90 static void replaceFI(MachineFunction &MF,
91 MachineBasicBlock::iterator II,
94 unsigned FIOperandNum, int Offset,
97 // Replace frame index with a frame pointer reference.
98 if (Offset >= -4096 && Offset <= 4095) {
99 // If the offset is small enough to fit in the immediate field, directly
101 MI.getOperand(FIOperandNum).ChangeToRegister(FramePtr, false);
102 MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset);
104 // Otherwise, emit a G1 = SETHI %hi(offset). FIXME: it would be better to
105 // scavenge a register here instead of reserving G1 all of the time.
106 const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
107 unsigned OffHi = (unsigned)Offset >> 10U;
108 BuildMI(*MI.getParent(), II, dl, TII.get(SP::SETHIi), SP::G1).addImm(OffHi);
110 BuildMI(*MI.getParent(), II, dl, TII.get(SP::ADDrr), SP::G1).addReg(SP::G1)
112 // Insert: G1+%lo(offset) into the user.
113 MI.getOperand(FIOperandNum).ChangeToRegister(SP::G1, false);
114 MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset & ((1 << 10)-1));
120 SparcRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
121 int SPAdj, unsigned FIOperandNum,
122 RegScavenger *RS) const {
123 assert(SPAdj == 0 && "Unexpected");
125 MachineInstr &MI = *II;
126 DebugLoc dl = MI.getDebugLoc();
127 int FrameIndex = MI.getOperand(FIOperandNum).getIndex();
129 // Addressable stack objects are accessed using neg. offsets from %fp
130 MachineFunction &MF = *MI.getParent()->getParent();
131 int64_t Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
132 MI.getOperand(FIOperandNum + 1).getImm() +
133 Subtarget.getStackPointerBias();
134 SparcMachineFunctionInfo *FuncInfo = MF.getInfo<SparcMachineFunctionInfo>();
135 unsigned FramePtr = SP::I6;
136 if (FuncInfo->isLeafProc()) {
137 // Use %sp and adjust offset if needed.
139 int stackSize = MF.getFrameInfo()->getStackSize();
140 Offset += (stackSize) ? Subtarget.getAdjustedFrameSize(stackSize) : 0 ;
143 if (!Subtarget.isV9() || !Subtarget.hasHardQuad()) {
144 if (MI.getOpcode() == SP::STQFri) {
145 const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
146 unsigned SrcReg = MI.getOperand(2).getReg();
147 unsigned SrcEvenReg = getSubReg(SrcReg, SP::sub_even64);
148 unsigned SrcOddReg = getSubReg(SrcReg, SP::sub_odd64);
150 BuildMI(*MI.getParent(), II, dl, TII.get(SP::STDFri))
151 .addReg(FramePtr).addImm(0).addReg(SrcEvenReg);
152 replaceFI(MF, II, *StMI, dl, 0, Offset, FramePtr);
153 MI.setDesc(TII.get(SP::STDFri));
154 MI.getOperand(2).setReg(SrcOddReg);
156 } else if (MI.getOpcode() == SP::LDQFri) {
157 const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
158 unsigned DestReg = MI.getOperand(0).getReg();
159 unsigned DestEvenReg = getSubReg(DestReg, SP::sub_even64);
160 unsigned DestOddReg = getSubReg(DestReg, SP::sub_odd64);
162 BuildMI(*MI.getParent(), II, dl, TII.get(SP::LDDFri), DestEvenReg)
163 .addReg(FramePtr).addImm(0);
164 replaceFI(MF, II, *StMI, dl, 1, Offset, FramePtr);
166 MI.setDesc(TII.get(SP::LDDFri));
167 MI.getOperand(0).setReg(DestOddReg);
172 replaceFI(MF, II, MI, dl, FIOperandNum, Offset, FramePtr);
176 unsigned SparcRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
180 unsigned SparcRegisterInfo::getEHExceptionRegister() const {
181 llvm_unreachable("What is the exception register");
184 unsigned SparcRegisterInfo::getEHHandlerRegister() const {
185 llvm_unreachable("What is the exception handler register");