1 //===- MBlazeRegisterInfo.cpp - MBlaze Register Information -== -*- C++ -*-===//
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 MBlaze implementation of the TargetRegisterInfo
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "mblaze-frame-info"
18 #include "MBlazeSubtarget.h"
19 #include "MBlazeRegisterInfo.h"
20 #include "MBlazeMachineFunction.h"
21 #include "llvm/Constants.h"
22 #include "llvm/Type.h"
23 #include "llvm/Function.h"
24 #include "llvm/CodeGen/ValueTypes.h"
25 #include "llvm/CodeGen/MachineInstrBuilder.h"
26 #include "llvm/CodeGen/MachineFunction.h"
27 #include "llvm/CodeGen/MachineFrameInfo.h"
28 #include "llvm/CodeGen/MachineLocation.h"
29 #include "llvm/Target/TargetFrameLowering.h"
30 #include "llvm/Target/TargetMachine.h"
31 #include "llvm/Target/TargetOptions.h"
32 #include "llvm/Target/TargetInstrInfo.h"
33 #include "llvm/Support/CommandLine.h"
34 #include "llvm/Support/Debug.h"
35 #include "llvm/Support/ErrorHandling.h"
36 #include "llvm/Support/raw_ostream.h"
37 #include "llvm/ADT/BitVector.h"
38 #include "llvm/ADT/STLExtras.h"
40 #define GET_REGINFO_MC_DESC
41 #define GET_REGINFO_TARGET_DESC
42 #include "MBlazeGenRegisterInfo.inc"
47 MBlazeRegisterInfo(const MBlazeSubtarget &ST, const TargetInstrInfo &tii)
48 : MBlazeGenRegisterInfo(MBlaze::ADJCALLSTACKDOWN, MBlaze::ADJCALLSTACKUP),
49 Subtarget(ST), TII(tii) {}
51 /// getRegisterNumbering - Given the enum value for some register, e.g.
52 /// MBlaze::R0, return the number that it corresponds to (e.g. 0).
53 unsigned MBlazeRegisterInfo::getRegisterNumbering(unsigned RegEnum) {
55 case MBlaze::R0 : return 0;
56 case MBlaze::R1 : return 1;
57 case MBlaze::R2 : return 2;
58 case MBlaze::R3 : return 3;
59 case MBlaze::R4 : return 4;
60 case MBlaze::R5 : return 5;
61 case MBlaze::R6 : return 6;
62 case MBlaze::R7 : return 7;
63 case MBlaze::R8 : return 8;
64 case MBlaze::R9 : return 9;
65 case MBlaze::R10 : return 10;
66 case MBlaze::R11 : return 11;
67 case MBlaze::R12 : return 12;
68 case MBlaze::R13 : return 13;
69 case MBlaze::R14 : return 14;
70 case MBlaze::R15 : return 15;
71 case MBlaze::R16 : return 16;
72 case MBlaze::R17 : return 17;
73 case MBlaze::R18 : return 18;
74 case MBlaze::R19 : return 19;
75 case MBlaze::R20 : return 20;
76 case MBlaze::R21 : return 21;
77 case MBlaze::R22 : return 22;
78 case MBlaze::R23 : return 23;
79 case MBlaze::R24 : return 24;
80 case MBlaze::R25 : return 25;
81 case MBlaze::R26 : return 26;
82 case MBlaze::R27 : return 27;
83 case MBlaze::R28 : return 28;
84 case MBlaze::R29 : return 29;
85 case MBlaze::R30 : return 30;
86 case MBlaze::R31 : return 31;
87 case MBlaze::RPC : return 0x0000;
88 case MBlaze::RMSR : return 0x0001;
89 case MBlaze::REAR : return 0x0003;
90 case MBlaze::RESR : return 0x0005;
91 case MBlaze::RFSR : return 0x0007;
92 case MBlaze::RBTR : return 0x000B;
93 case MBlaze::REDR : return 0x000D;
94 case MBlaze::RPID : return 0x1000;
95 case MBlaze::RZPR : return 0x1001;
96 case MBlaze::RTLBX : return 0x1002;
97 case MBlaze::RTLBLO : return 0x1003;
98 case MBlaze::RTLBHI : return 0x1004;
99 case MBlaze::RPVR0 : return 0x2000;
100 case MBlaze::RPVR1 : return 0x2001;
101 case MBlaze::RPVR2 : return 0x2002;
102 case MBlaze::RPVR3 : return 0x2003;
103 case MBlaze::RPVR4 : return 0x2004;
104 case MBlaze::RPVR5 : return 0x2005;
105 case MBlaze::RPVR6 : return 0x2006;
106 case MBlaze::RPVR7 : return 0x2007;
107 case MBlaze::RPVR8 : return 0x2008;
108 case MBlaze::RPVR9 : return 0x2009;
109 case MBlaze::RPVR10 : return 0x200A;
110 case MBlaze::RPVR11 : return 0x200B;
111 default: llvm_unreachable("Unknown register number!");
113 return 0; // Not reached
116 /// getRegisterFromNumbering - Given the enum value for some register, e.g.
117 /// MBlaze::R0, return the number that it corresponds to (e.g. 0).
118 unsigned MBlazeRegisterInfo::getRegisterFromNumbering(unsigned Reg) {
120 case 0 : return MBlaze::R0;
121 case 1 : return MBlaze::R1;
122 case 2 : return MBlaze::R2;
123 case 3 : return MBlaze::R3;
124 case 4 : return MBlaze::R4;
125 case 5 : return MBlaze::R5;
126 case 6 : return MBlaze::R6;
127 case 7 : return MBlaze::R7;
128 case 8 : return MBlaze::R8;
129 case 9 : return MBlaze::R9;
130 case 10 : return MBlaze::R10;
131 case 11 : return MBlaze::R11;
132 case 12 : return MBlaze::R12;
133 case 13 : return MBlaze::R13;
134 case 14 : return MBlaze::R14;
135 case 15 : return MBlaze::R15;
136 case 16 : return MBlaze::R16;
137 case 17 : return MBlaze::R17;
138 case 18 : return MBlaze::R18;
139 case 19 : return MBlaze::R19;
140 case 20 : return MBlaze::R20;
141 case 21 : return MBlaze::R21;
142 case 22 : return MBlaze::R22;
143 case 23 : return MBlaze::R23;
144 case 24 : return MBlaze::R24;
145 case 25 : return MBlaze::R25;
146 case 26 : return MBlaze::R26;
147 case 27 : return MBlaze::R27;
148 case 28 : return MBlaze::R28;
149 case 29 : return MBlaze::R29;
150 case 30 : return MBlaze::R30;
151 case 31 : return MBlaze::R31;
152 default: llvm_unreachable("Unknown register number!");
154 return 0; // Not reached
157 unsigned MBlazeRegisterInfo::getSpecialRegisterFromNumbering(unsigned Reg) {
159 case 0x0000 : return MBlaze::RPC;
160 case 0x0001 : return MBlaze::RMSR;
161 case 0x0003 : return MBlaze::REAR;
162 case 0x0005 : return MBlaze::RESR;
163 case 0x0007 : return MBlaze::RFSR;
164 case 0x000B : return MBlaze::RBTR;
165 case 0x000D : return MBlaze::REDR;
166 case 0x1000 : return MBlaze::RPID;
167 case 0x1001 : return MBlaze::RZPR;
168 case 0x1002 : return MBlaze::RTLBX;
169 case 0x1003 : return MBlaze::RTLBLO;
170 case 0x1004 : return MBlaze::RTLBHI;
171 case 0x2000 : return MBlaze::RPVR0;
172 case 0x2001 : return MBlaze::RPVR1;
173 case 0x2002 : return MBlaze::RPVR2;
174 case 0x2003 : return MBlaze::RPVR3;
175 case 0x2004 : return MBlaze::RPVR4;
176 case 0x2005 : return MBlaze::RPVR5;
177 case 0x2006 : return MBlaze::RPVR6;
178 case 0x2007 : return MBlaze::RPVR7;
179 case 0x2008 : return MBlaze::RPVR8;
180 case 0x2009 : return MBlaze::RPVR9;
181 case 0x200A : return MBlaze::RPVR10;
182 case 0x200B : return MBlaze::RPVR11;
183 default: llvm_unreachable("Unknown register number!");
185 return 0; // Not reached
188 bool MBlazeRegisterInfo::isRegister(unsigned Reg) {
192 bool MBlazeRegisterInfo::isSpecialRegister(unsigned Reg) {
194 case 0x0000 : case 0x0001 : case 0x0003 : case 0x0005 :
195 case 0x0007 : case 0x000B : case 0x000D : case 0x1000 :
196 case 0x1001 : case 0x1002 : case 0x1003 : case 0x1004 :
197 case 0x2000 : case 0x2001 : case 0x2002 : case 0x2003 :
198 case 0x2004 : case 0x2005 : case 0x2006 : case 0x2007 :
199 case 0x2008 : case 0x2009 : case 0x200A : case 0x200B :
205 return false; // Not reached
208 unsigned MBlazeRegisterInfo::getPICCallReg() {
212 //===----------------------------------------------------------------------===//
213 // Callee Saved Registers methods
214 //===----------------------------------------------------------------------===//
216 /// MBlaze Callee Saved Registers
217 const unsigned* MBlazeRegisterInfo::
218 getCalleeSavedRegs(const MachineFunction *MF) const {
219 // MBlaze callee-save register range is R20 - R31
220 static const unsigned CalleeSavedRegs[] = {
221 MBlaze::R20, MBlaze::R21, MBlaze::R22, MBlaze::R23,
222 MBlaze::R24, MBlaze::R25, MBlaze::R26, MBlaze::R27,
223 MBlaze::R28, MBlaze::R29, MBlaze::R30, MBlaze::R31,
227 return CalleeSavedRegs;
230 BitVector MBlazeRegisterInfo::
231 getReservedRegs(const MachineFunction &MF) const {
232 BitVector Reserved(getNumRegs());
233 Reserved.set(MBlaze::R0);
234 Reserved.set(MBlaze::R1);
235 Reserved.set(MBlaze::R2);
236 Reserved.set(MBlaze::R13);
237 Reserved.set(MBlaze::R14);
238 Reserved.set(MBlaze::R15);
239 Reserved.set(MBlaze::R16);
240 Reserved.set(MBlaze::R17);
241 Reserved.set(MBlaze::R18);
242 Reserved.set(MBlaze::R19);
246 // This function eliminate ADJCALLSTACKDOWN/ADJCALLSTACKUP pseudo instructions
247 void MBlazeRegisterInfo::
248 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
249 MachineBasicBlock::iterator I) const {
250 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
252 if (!TFI->hasReservedCallFrame(MF)) {
253 // If we have a frame pointer, turn the adjcallstackup instruction into a
254 // 'addi r1, r1, -<amt>' and the adjcallstackdown instruction into
255 // 'addi r1, r1, <amt>'
256 MachineInstr *Old = I;
257 int Amount = Old->getOperand(0).getImm() + 4;
259 // We need to keep the stack aligned properly. To do this, we round the
260 // amount of space needed for the outgoing arguments up to the next
261 // alignment boundary.
262 unsigned Align = TFI->getStackAlignment();
263 Amount = (Amount+Align-1)/Align*Align;
266 if (Old->getOpcode() == MBlaze::ADJCALLSTACKDOWN) {
267 New = BuildMI(MF,Old->getDebugLoc(),TII.get(MBlaze::ADDIK),MBlaze::R1)
268 .addReg(MBlaze::R1).addImm(-Amount);
270 assert(Old->getOpcode() == MBlaze::ADJCALLSTACKUP);
271 New = BuildMI(MF,Old->getDebugLoc(),TII.get(MBlaze::ADDIK),MBlaze::R1)
272 .addReg(MBlaze::R1).addImm(Amount);
275 // Replace the pseudo instruction with a new instruction...
280 // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
284 // FrameIndex represent objects inside a abstract stack.
285 // We must replace FrameIndex with an stack/frame pointer
287 void MBlazeRegisterInfo::
288 eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
289 RegScavenger *RS) const {
290 MachineInstr &MI = *II;
291 MachineFunction &MF = *MI.getParent()->getParent();
292 MachineFrameInfo *MFI = MF.getFrameInfo();
295 while (!MI.getOperand(i).isFI()) {
297 assert(i < MI.getNumOperands() &&
298 "Instr doesn't have FrameIndex operand!");
301 unsigned oi = i == 2 ? 1 : 2;
303 DEBUG(dbgs() << "\nFunction : " << MF.getFunction()->getName() << "\n";
304 dbgs() << "<--------->\n" << MI);
306 int FrameIndex = MI.getOperand(i).getIndex();
307 int stackSize = MFI->getStackSize();
308 int spOffset = MFI->getObjectOffset(FrameIndex);
310 DEBUG(MBlazeFunctionInfo *MBlazeFI = MF.getInfo<MBlazeFunctionInfo>();
311 dbgs() << "FrameIndex : " << FrameIndex << "\n"
312 << "spOffset : " << spOffset << "\n"
313 << "stackSize : " << stackSize << "\n"
314 << "isFixed : " << MFI->isFixedObjectIndex(FrameIndex) << "\n"
315 << "isLiveIn : " << MBlazeFI->isLiveIn(FrameIndex) << "\n"
316 << "isSpill : " << MFI->isSpillSlotObjectIndex(FrameIndex)
319 // as explained on LowerFormalArguments, detect negative offsets
320 // and adjust SPOffsets considering the final stack size.
321 int Offset = (spOffset < 0) ? (stackSize - spOffset) : spOffset;
322 Offset += MI.getOperand(oi).getImm();
324 DEBUG(dbgs() << "Offset : " << Offset << "\n" << "<--------->\n");
326 MI.getOperand(oi).ChangeToImmediate(Offset);
327 MI.getOperand(i).ChangeToRegister(getFrameRegister(MF), false);
330 void MBlazeRegisterInfo::
331 processFunctionBeforeFrameFinalized(MachineFunction &MF) const {
332 // Set the stack offset where GP must be saved/loaded from.
333 MachineFrameInfo *MFI = MF.getFrameInfo();
334 MBlazeFunctionInfo *MBlazeFI = MF.getInfo<MBlazeFunctionInfo>();
335 if (MBlazeFI->needGPSaveRestore())
336 MFI->setObjectOffset(MBlazeFI->getGPFI(), MBlazeFI->getGPStackOffset());
339 unsigned MBlazeRegisterInfo::getRARegister() const {
343 unsigned MBlazeRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
344 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
346 return TFI->hasFP(MF) ? MBlaze::R19 : MBlaze::R1;
349 unsigned MBlazeRegisterInfo::getEHExceptionRegister() const {
350 llvm_unreachable("What is the exception register");
354 unsigned MBlazeRegisterInfo::getEHHandlerRegister() const {
355 llvm_unreachable("What is the exception handler register");
359 int MBlazeRegisterInfo::getDwarfRegNum(unsigned RegNo, bool isEH) const {
360 return MBlazeGenRegisterInfo::getDwarfRegNumFull(RegNo,0);
363 int MBlazeRegisterInfo::getLLVMRegNum(unsigned DwarfRegNo, bool isEH) const {
364 return MBlazeGenRegisterInfo::getLLVMRegNumFull(DwarfRegNo,0);