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 {
52 SparcRegisterInfo::getRTCallPreservedMask(CallingConv::ID CC) const {
56 BitVector SparcRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
57 BitVector Reserved(getNumRegs());
58 // FIXME: G1 reserved for now for large imm generation by frame code.
61 // G1-G4 can be used in applications.
62 if (ReserveAppRegisters) {
67 // G5 is not reserved in 64 bit mode.
68 if (!Subtarget.is64Bit())
78 // Unaliased double registers are not available in non-V9 targets.
79 if (!Subtarget.isV9()) {
80 for (unsigned n = 0; n != 16; ++n) {
81 for (MCRegAliasIterator AI(SP::D16 + n, this, true); AI.isValid(); ++AI)
89 const TargetRegisterClass*
90 SparcRegisterInfo::getPointerRegClass(const MachineFunction &MF,
91 unsigned Kind) const {
92 return Subtarget.is64Bit() ? &SP::I64RegsRegClass : &SP::IntRegsRegClass;
95 static void replaceFI(MachineFunction &MF,
96 MachineBasicBlock::iterator II,
99 unsigned FIOperandNum, int Offset,
102 // Replace frame index with a frame pointer reference.
103 if (Offset >= -4096 && Offset <= 4095) {
104 // If the offset is small enough to fit in the immediate field, directly
106 MI.getOperand(FIOperandNum).ChangeToRegister(FramePtr, false);
107 MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset);
109 // Otherwise, emit a G1 = SETHI %hi(offset). FIXME: it would be better to
110 // scavenge a register here instead of reserving G1 all of the time.
111 const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
112 unsigned OffHi = (unsigned)Offset >> 10U;
113 BuildMI(*MI.getParent(), II, dl, TII.get(SP::SETHIi), SP::G1).addImm(OffHi);
115 BuildMI(*MI.getParent(), II, dl, TII.get(SP::ADDrr), SP::G1).addReg(SP::G1)
117 // Insert: G1+%lo(offset) into the user.
118 MI.getOperand(FIOperandNum).ChangeToRegister(SP::G1, false);
119 MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset & ((1 << 10)-1));
125 SparcRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
126 int SPAdj, unsigned FIOperandNum,
127 RegScavenger *RS) const {
128 assert(SPAdj == 0 && "Unexpected");
130 MachineInstr &MI = *II;
131 DebugLoc dl = MI.getDebugLoc();
132 int FrameIndex = MI.getOperand(FIOperandNum).getIndex();
134 // Addressable stack objects are accessed using neg. offsets from %fp
135 MachineFunction &MF = *MI.getParent()->getParent();
136 int64_t Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
137 MI.getOperand(FIOperandNum + 1).getImm() +
138 Subtarget.getStackPointerBias();
139 SparcMachineFunctionInfo *FuncInfo = MF.getInfo<SparcMachineFunctionInfo>();
140 unsigned FramePtr = SP::I6;
141 if (FuncInfo->isLeafProc()) {
142 // Use %sp and adjust offset if needed.
144 int stackSize = MF.getFrameInfo()->getStackSize();
145 Offset += (stackSize) ? Subtarget.getAdjustedFrameSize(stackSize) : 0 ;
148 if (!Subtarget.isV9() || !Subtarget.hasHardQuad()) {
149 if (MI.getOpcode() == SP::STQFri) {
150 const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
151 unsigned SrcReg = MI.getOperand(2).getReg();
152 unsigned SrcEvenReg = getSubReg(SrcReg, SP::sub_even64);
153 unsigned SrcOddReg = getSubReg(SrcReg, SP::sub_odd64);
155 BuildMI(*MI.getParent(), II, dl, TII.get(SP::STDFri))
156 .addReg(FramePtr).addImm(0).addReg(SrcEvenReg);
157 replaceFI(MF, II, *StMI, dl, 0, Offset, FramePtr);
158 MI.setDesc(TII.get(SP::STDFri));
159 MI.getOperand(2).setReg(SrcOddReg);
161 } else if (MI.getOpcode() == SP::LDQFri) {
162 const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
163 unsigned DestReg = MI.getOperand(0).getReg();
164 unsigned DestEvenReg = getSubReg(DestReg, SP::sub_even64);
165 unsigned DestOddReg = getSubReg(DestReg, SP::sub_odd64);
167 BuildMI(*MI.getParent(), II, dl, TII.get(SP::LDDFri), DestEvenReg)
168 .addReg(FramePtr).addImm(0);
169 replaceFI(MF, II, *StMI, dl, 1, Offset, FramePtr);
171 MI.setDesc(TII.get(SP::LDDFri));
172 MI.getOperand(0).setReg(DestOddReg);
177 replaceFI(MF, II, MI, dl, FIOperandNum, Offset, FramePtr);
181 unsigned SparcRegisterInfo::getFrameRegister(const MachineFunction &MF) const {