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/Target/TargetFrameLowering.h"
29 #include "llvm/Target/TargetMachine.h"
30 #include "llvm/Target/TargetOptions.h"
31 #include "llvm/Target/TargetInstrInfo.h"
32 #include "llvm/Support/CommandLine.h"
33 #include "llvm/Support/Debug.h"
34 #include "llvm/Support/ErrorHandling.h"
35 #include "llvm/Support/raw_ostream.h"
36 #include "llvm/ADT/BitVector.h"
37 #include "llvm/ADT/STLExtras.h"
39 #define GET_REGINFO_TARGET_DESC
40 #include "MBlazeGenRegisterInfo.inc"
45 MBlazeRegisterInfo(const MBlazeSubtarget &ST, const TargetInstrInfo &tii)
46 : MBlazeGenRegisterInfo(MBlaze::R15), Subtarget(ST), TII(tii) {}
48 /// getRegisterNumbering - Given the enum value for some register, e.g.
49 /// MBlaze::R0, return the number that it corresponds to (e.g. 0).
50 unsigned MBlazeRegisterInfo::getRegisterNumbering(unsigned RegEnum) {
52 case MBlaze::R0 : return 0;
53 case MBlaze::R1 : return 1;
54 case MBlaze::R2 : return 2;
55 case MBlaze::R3 : return 3;
56 case MBlaze::R4 : return 4;
57 case MBlaze::R5 : return 5;
58 case MBlaze::R6 : return 6;
59 case MBlaze::R7 : return 7;
60 case MBlaze::R8 : return 8;
61 case MBlaze::R9 : return 9;
62 case MBlaze::R10 : return 10;
63 case MBlaze::R11 : return 11;
64 case MBlaze::R12 : return 12;
65 case MBlaze::R13 : return 13;
66 case MBlaze::R14 : return 14;
67 case MBlaze::R15 : return 15;
68 case MBlaze::R16 : return 16;
69 case MBlaze::R17 : return 17;
70 case MBlaze::R18 : return 18;
71 case MBlaze::R19 : return 19;
72 case MBlaze::R20 : return 20;
73 case MBlaze::R21 : return 21;
74 case MBlaze::R22 : return 22;
75 case MBlaze::R23 : return 23;
76 case MBlaze::R24 : return 24;
77 case MBlaze::R25 : return 25;
78 case MBlaze::R26 : return 26;
79 case MBlaze::R27 : return 27;
80 case MBlaze::R28 : return 28;
81 case MBlaze::R29 : return 29;
82 case MBlaze::R30 : return 30;
83 case MBlaze::R31 : return 31;
84 case MBlaze::RPC : return 0x0000;
85 case MBlaze::RMSR : return 0x0001;
86 case MBlaze::REAR : return 0x0003;
87 case MBlaze::RESR : return 0x0005;
88 case MBlaze::RFSR : return 0x0007;
89 case MBlaze::RBTR : return 0x000B;
90 case MBlaze::REDR : return 0x000D;
91 case MBlaze::RPID : return 0x1000;
92 case MBlaze::RZPR : return 0x1001;
93 case MBlaze::RTLBX : return 0x1002;
94 case MBlaze::RTLBLO : return 0x1003;
95 case MBlaze::RTLBHI : return 0x1004;
96 case MBlaze::RPVR0 : return 0x2000;
97 case MBlaze::RPVR1 : return 0x2001;
98 case MBlaze::RPVR2 : return 0x2002;
99 case MBlaze::RPVR3 : return 0x2003;
100 case MBlaze::RPVR4 : return 0x2004;
101 case MBlaze::RPVR5 : return 0x2005;
102 case MBlaze::RPVR6 : return 0x2006;
103 case MBlaze::RPVR7 : return 0x2007;
104 case MBlaze::RPVR8 : return 0x2008;
105 case MBlaze::RPVR9 : return 0x2009;
106 case MBlaze::RPVR10 : return 0x200A;
107 case MBlaze::RPVR11 : return 0x200B;
108 default: llvm_unreachable("Unknown register number!");
110 return 0; // Not reached
113 /// getRegisterFromNumbering - Given the enum value for some register, e.g.
114 /// MBlaze::R0, return the number that it corresponds to (e.g. 0).
115 unsigned MBlazeRegisterInfo::getRegisterFromNumbering(unsigned Reg) {
117 case 0 : return MBlaze::R0;
118 case 1 : return MBlaze::R1;
119 case 2 : return MBlaze::R2;
120 case 3 : return MBlaze::R3;
121 case 4 : return MBlaze::R4;
122 case 5 : return MBlaze::R5;
123 case 6 : return MBlaze::R6;
124 case 7 : return MBlaze::R7;
125 case 8 : return MBlaze::R8;
126 case 9 : return MBlaze::R9;
127 case 10 : return MBlaze::R10;
128 case 11 : return MBlaze::R11;
129 case 12 : return MBlaze::R12;
130 case 13 : return MBlaze::R13;
131 case 14 : return MBlaze::R14;
132 case 15 : return MBlaze::R15;
133 case 16 : return MBlaze::R16;
134 case 17 : return MBlaze::R17;
135 case 18 : return MBlaze::R18;
136 case 19 : return MBlaze::R19;
137 case 20 : return MBlaze::R20;
138 case 21 : return MBlaze::R21;
139 case 22 : return MBlaze::R22;
140 case 23 : return MBlaze::R23;
141 case 24 : return MBlaze::R24;
142 case 25 : return MBlaze::R25;
143 case 26 : return MBlaze::R26;
144 case 27 : return MBlaze::R27;
145 case 28 : return MBlaze::R28;
146 case 29 : return MBlaze::R29;
147 case 30 : return MBlaze::R30;
148 case 31 : return MBlaze::R31;
149 default: llvm_unreachable("Unknown register number!");
151 return 0; // Not reached
154 unsigned MBlazeRegisterInfo::getSpecialRegisterFromNumbering(unsigned Reg) {
156 case 0x0000 : return MBlaze::RPC;
157 case 0x0001 : return MBlaze::RMSR;
158 case 0x0003 : return MBlaze::REAR;
159 case 0x0005 : return MBlaze::RESR;
160 case 0x0007 : return MBlaze::RFSR;
161 case 0x000B : return MBlaze::RBTR;
162 case 0x000D : return MBlaze::REDR;
163 case 0x1000 : return MBlaze::RPID;
164 case 0x1001 : return MBlaze::RZPR;
165 case 0x1002 : return MBlaze::RTLBX;
166 case 0x1003 : return MBlaze::RTLBLO;
167 case 0x1004 : return MBlaze::RTLBHI;
168 case 0x2000 : return MBlaze::RPVR0;
169 case 0x2001 : return MBlaze::RPVR1;
170 case 0x2002 : return MBlaze::RPVR2;
171 case 0x2003 : return MBlaze::RPVR3;
172 case 0x2004 : return MBlaze::RPVR4;
173 case 0x2005 : return MBlaze::RPVR5;
174 case 0x2006 : return MBlaze::RPVR6;
175 case 0x2007 : return MBlaze::RPVR7;
176 case 0x2008 : return MBlaze::RPVR8;
177 case 0x2009 : return MBlaze::RPVR9;
178 case 0x200A : return MBlaze::RPVR10;
179 case 0x200B : return MBlaze::RPVR11;
180 default: llvm_unreachable("Unknown register number!");
182 return 0; // Not reached
185 bool MBlazeRegisterInfo::isRegister(unsigned Reg) {
189 bool MBlazeRegisterInfo::isSpecialRegister(unsigned Reg) {
191 case 0x0000 : case 0x0001 : case 0x0003 : case 0x0005 :
192 case 0x0007 : case 0x000B : case 0x000D : case 0x1000 :
193 case 0x1001 : case 0x1002 : case 0x1003 : case 0x1004 :
194 case 0x2000 : case 0x2001 : case 0x2002 : case 0x2003 :
195 case 0x2004 : case 0x2005 : case 0x2006 : case 0x2007 :
196 case 0x2008 : case 0x2009 : case 0x200A : case 0x200B :
202 return false; // Not reached
205 unsigned MBlazeRegisterInfo::getPICCallReg() {
209 //===----------------------------------------------------------------------===//
210 // Callee Saved Registers methods
211 //===----------------------------------------------------------------------===//
213 /// MBlaze Callee Saved Registers
214 const unsigned* MBlazeRegisterInfo::
215 getCalleeSavedRegs(const MachineFunction *MF) const {
216 // MBlaze callee-save register range is R20 - R31
217 static const unsigned CalleeSavedRegs[] = {
218 MBlaze::R20, MBlaze::R21, MBlaze::R22, MBlaze::R23,
219 MBlaze::R24, MBlaze::R25, MBlaze::R26, MBlaze::R27,
220 MBlaze::R28, MBlaze::R29, MBlaze::R30, MBlaze::R31,
224 return CalleeSavedRegs;
227 BitVector MBlazeRegisterInfo::
228 getReservedRegs(const MachineFunction &MF) const {
229 BitVector Reserved(getNumRegs());
230 Reserved.set(MBlaze::R0);
231 Reserved.set(MBlaze::R1);
232 Reserved.set(MBlaze::R2);
233 Reserved.set(MBlaze::R13);
234 Reserved.set(MBlaze::R14);
235 Reserved.set(MBlaze::R15);
236 Reserved.set(MBlaze::R16);
237 Reserved.set(MBlaze::R17);
238 Reserved.set(MBlaze::R18);
239 Reserved.set(MBlaze::R19);
243 // This function eliminate ADJCALLSTACKDOWN/ADJCALLSTACKUP pseudo instructions
244 void MBlazeRegisterInfo::
245 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
246 MachineBasicBlock::iterator I) const {
247 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
249 if (!TFI->hasReservedCallFrame(MF)) {
250 // If we have a frame pointer, turn the adjcallstackup instruction into a
251 // 'addi r1, r1, -<amt>' and the adjcallstackdown instruction into
252 // 'addi r1, r1, <amt>'
253 MachineInstr *Old = I;
254 int Amount = Old->getOperand(0).getImm() + 4;
256 // We need to keep the stack aligned properly. To do this, we round the
257 // amount of space needed for the outgoing arguments up to the next
258 // alignment boundary.
259 unsigned Align = TFI->getStackAlignment();
260 Amount = (Amount+Align-1)/Align*Align;
263 if (Old->getOpcode() == MBlaze::ADJCALLSTACKDOWN) {
264 New = BuildMI(MF,Old->getDebugLoc(),TII.get(MBlaze::ADDIK),MBlaze::R1)
265 .addReg(MBlaze::R1).addImm(-Amount);
267 assert(Old->getOpcode() == MBlaze::ADJCALLSTACKUP);
268 New = BuildMI(MF,Old->getDebugLoc(),TII.get(MBlaze::ADDIK),MBlaze::R1)
269 .addReg(MBlaze::R1).addImm(Amount);
272 // Replace the pseudo instruction with a new instruction...
277 // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
281 // FrameIndex represent objects inside a abstract stack.
282 // We must replace FrameIndex with an stack/frame pointer
284 void MBlazeRegisterInfo::
285 eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
286 RegScavenger *RS) const {
287 MachineInstr &MI = *II;
288 MachineFunction &MF = *MI.getParent()->getParent();
289 MachineFrameInfo *MFI = MF.getFrameInfo();
292 while (!MI.getOperand(i).isFI()) {
294 assert(i < MI.getNumOperands() &&
295 "Instr doesn't have FrameIndex operand!");
298 unsigned oi = i == 2 ? 1 : 2;
300 DEBUG(dbgs() << "\nFunction : " << MF.getFunction()->getName() << "\n";
301 dbgs() << "<--------->\n" << MI);
303 int FrameIndex = MI.getOperand(i).getIndex();
304 int stackSize = MFI->getStackSize();
305 int spOffset = MFI->getObjectOffset(FrameIndex);
307 DEBUG(MBlazeFunctionInfo *MBlazeFI = MF.getInfo<MBlazeFunctionInfo>();
308 dbgs() << "FrameIndex : " << FrameIndex << "\n"
309 << "spOffset : " << spOffset << "\n"
310 << "stackSize : " << stackSize << "\n"
311 << "isFixed : " << MFI->isFixedObjectIndex(FrameIndex) << "\n"
312 << "isLiveIn : " << MBlazeFI->isLiveIn(FrameIndex) << "\n"
313 << "isSpill : " << MFI->isSpillSlotObjectIndex(FrameIndex)
316 // as explained on LowerFormalArguments, detect negative offsets
317 // and adjust SPOffsets considering the final stack size.
318 int Offset = (spOffset < 0) ? (stackSize - spOffset) : spOffset;
319 Offset += MI.getOperand(oi).getImm();
321 DEBUG(dbgs() << "Offset : " << Offset << "\n" << "<--------->\n");
323 MI.getOperand(oi).ChangeToImmediate(Offset);
324 MI.getOperand(i).ChangeToRegister(getFrameRegister(MF), false);
327 void MBlazeRegisterInfo::
328 processFunctionBeforeFrameFinalized(MachineFunction &MF) const {
329 // Set the stack offset where GP must be saved/loaded from.
330 MachineFrameInfo *MFI = MF.getFrameInfo();
331 MBlazeFunctionInfo *MBlazeFI = MF.getInfo<MBlazeFunctionInfo>();
332 if (MBlazeFI->needGPSaveRestore())
333 MFI->setObjectOffset(MBlazeFI->getGPFI(), MBlazeFI->getGPStackOffset());
336 unsigned MBlazeRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
337 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
339 return TFI->hasFP(MF) ? MBlaze::R19 : MBlaze::R1;
342 unsigned MBlazeRegisterInfo::getEHExceptionRegister() const {
343 llvm_unreachable("What is the exception register");
347 unsigned MBlazeRegisterInfo::getEHHandlerRegister() const {
348 llvm_unreachable("What is the exception handler register");