1 //===- XCoreRegisterInfo.cpp - XCore 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 XCore implementation of the MRegisterInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "XCoreRegisterInfo.h"
15 #include "XCoreMachineFunctionInfo.h"
17 #include "llvm/CodeGen/MachineInstrBuilder.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 #include "llvm/CodeGen/MachineFrameInfo.h"
20 #include "llvm/CodeGen/MachineLocation.h"
21 #include "llvm/CodeGen/MachineModuleInfo.h"
22 #include "llvm/CodeGen/MachineRegisterInfo.h"
23 #include "llvm/CodeGen/RegisterScavenging.h"
24 #include "llvm/Target/TargetFrameLowering.h"
25 #include "llvm/Target/TargetMachine.h"
26 #include "llvm/Target/TargetOptions.h"
27 #include "llvm/Target/TargetInstrInfo.h"
28 #include "llvm/Type.h"
29 #include "llvm/Function.h"
30 #include "llvm/ADT/BitVector.h"
31 #include "llvm/ADT/STLExtras.h"
32 #include "llvm/Support/Debug.h"
33 #include "llvm/Support/ErrorHandling.h"
34 #include "llvm/Support/raw_ostream.h"
36 #define GET_REGINFO_MC_DESC
37 #define GET_REGINFO_TARGET_DESC
38 #include "XCoreGenRegisterInfo.inc"
42 XCoreRegisterInfo::XCoreRegisterInfo(const TargetInstrInfo &tii)
43 : XCoreGenRegisterInfo(XCore::ADJCALLSTACKDOWN, XCore::ADJCALLSTACKUP),
48 static inline bool isImmUs(unsigned val) {
52 static inline bool isImmU6(unsigned val) {
53 return val < (1 << 6);
56 static inline bool isImmU16(unsigned val) {
57 return val < (1 << 16);
60 static const unsigned XCore_ArgRegs[] = {
61 XCore::R0, XCore::R1, XCore::R2, XCore::R3
64 const unsigned * XCoreRegisterInfo::getArgRegs(const MachineFunction *MF)
69 unsigned XCoreRegisterInfo::getNumArgRegs(const MachineFunction *MF)
71 return array_lengthof(XCore_ArgRegs);
74 bool XCoreRegisterInfo::needsFrameMoves(const MachineFunction &MF) {
75 return MF.getMMI().hasDebugInfo() ||
76 MF.getFunction()->needsUnwindTableEntry();
79 const unsigned* XCoreRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF)
81 static const unsigned CalleeSavedRegs[] = {
82 XCore::R4, XCore::R5, XCore::R6, XCore::R7,
83 XCore::R8, XCore::R9, XCore::R10, XCore::LR,
86 return CalleeSavedRegs;
89 BitVector XCoreRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
90 BitVector Reserved(getNumRegs());
91 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
93 Reserved.set(XCore::CP);
94 Reserved.set(XCore::DP);
95 Reserved.set(XCore::SP);
96 Reserved.set(XCore::LR);
98 Reserved.set(XCore::R10);
104 XCoreRegisterInfo::requiresRegisterScavenging(const MachineFunction &MF) const {
105 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
107 // TODO can we estimate stack size?
108 return TFI->hasFP(MF);
112 XCoreRegisterInfo::useFPForScavengingIndex(const MachineFunction &MF) const {
116 // This function eliminates ADJCALLSTACKDOWN,
117 // ADJCALLSTACKUP pseudo instructions
118 void XCoreRegisterInfo::
119 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
120 MachineBasicBlock::iterator I) const {
121 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
123 if (!TFI->hasReservedCallFrame(MF)) {
124 // Turn the adjcallstackdown instruction into 'extsp <amt>' and the
125 // adjcallstackup instruction into 'ldaw sp, sp[<amt>]'
126 MachineInstr *Old = I;
127 uint64_t Amount = Old->getOperand(0).getImm();
129 // We need to keep the stack aligned properly. To do this, we round the
130 // amount of space needed for the outgoing arguments up to the next
131 // alignment boundary.
132 unsigned Align = TFI->getStackAlignment();
133 Amount = (Amount+Align-1)/Align*Align;
135 assert(Amount%4 == 0);
138 bool isU6 = isImmU6(Amount);
139 if (!isU6 && !isImmU16(Amount)) {
140 // FIX could emit multiple instructions in this case.
142 errs() << "eliminateCallFramePseudoInstr size too big: "
149 if (Old->getOpcode() == XCore::ADJCALLSTACKDOWN) {
150 int Opcode = isU6 ? XCore::EXTSP_u6 : XCore::EXTSP_lu6;
151 New=BuildMI(MF, Old->getDebugLoc(), TII.get(Opcode))
154 assert(Old->getOpcode() == XCore::ADJCALLSTACKUP);
155 int Opcode = isU6 ? XCore::LDAWSP_ru6_RRegs : XCore::LDAWSP_lru6_RRegs;
156 New=BuildMI(MF, Old->getDebugLoc(), TII.get(Opcode), XCore::SP)
160 // Replace the pseudo instruction with a new instruction...
169 XCoreRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
170 int SPAdj, RegScavenger *RS) const {
171 assert(SPAdj == 0 && "Unexpected");
172 MachineInstr &MI = *II;
173 DebugLoc dl = MI.getDebugLoc();
176 while (!MI.getOperand(i).isFI()) {
178 assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
181 MachineOperand &FrameOp = MI.getOperand(i);
182 int FrameIndex = FrameOp.getIndex();
184 MachineFunction &MF = *MI.getParent()->getParent();
185 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
186 int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex);
187 int StackSize = MF.getFrameInfo()->getStackSize();
190 DEBUG(errs() << "\nFunction : "
191 << MF.getFunction()->getName() << "\n");
192 DEBUG(errs() << "<--------->\n");
193 DEBUG(MI.print(errs()));
194 DEBUG(errs() << "FrameIndex : " << FrameIndex << "\n");
195 DEBUG(errs() << "FrameOffset : " << Offset << "\n");
196 DEBUG(errs() << "StackSize : " << StackSize << "\n");
201 // fold constant into offset.
202 Offset += MI.getOperand(i + 1).getImm();
203 MI.getOperand(i + 1).ChangeToImmediate(0);
205 assert(Offset%4 == 0 && "Misaligned stack offset");
207 DEBUG(errs() << "Offset : " << Offset << "\n" << "<--------->\n");
211 bool FP = TFI->hasFP(MF);
213 unsigned Reg = MI.getOperand(0).getReg();
214 bool isKill = MI.getOpcode() == XCore::STWFI && MI.getOperand(0).isKill();
216 assert(XCore::GRRegsRegisterClass->contains(Reg) &&
217 "Unexpected register operand");
219 MachineBasicBlock &MBB = *MI.getParent();
222 bool isUs = isImmUs(Offset);
223 unsigned FramePtr = XCore::R10;
227 report_fatal_error("eliminateFrameIndex Frame size too big: " +
229 unsigned ScratchReg = RS->scavengeRegister(XCore::GRRegsRegisterClass, II,
231 loadConstant(MBB, II, ScratchReg, Offset, dl);
232 switch (MI.getOpcode()) {
234 BuildMI(MBB, II, dl, TII.get(XCore::LDW_3r), Reg)
236 .addReg(ScratchReg, RegState::Kill);
239 BuildMI(MBB, II, dl, TII.get(XCore::STW_3r))
240 .addReg(Reg, getKillRegState(isKill))
242 .addReg(ScratchReg, RegState::Kill);
245 BuildMI(MBB, II, dl, TII.get(XCore::LDAWF_l3r), Reg)
247 .addReg(ScratchReg, RegState::Kill);
250 llvm_unreachable("Unexpected Opcode");
253 switch (MI.getOpcode()) {
255 BuildMI(MBB, II, dl, TII.get(XCore::LDW_2rus), Reg)
260 BuildMI(MBB, II, dl, TII.get(XCore::STW_2rus))
261 .addReg(Reg, getKillRegState(isKill))
266 BuildMI(MBB, II, dl, TII.get(XCore::LDAWF_l2rus), Reg)
271 llvm_unreachable("Unexpected Opcode");
275 bool isU6 = isImmU6(Offset);
276 if (!isU6 && !isImmU16(Offset))
277 report_fatal_error("eliminateFrameIndex Frame size too big: " +
280 switch (MI.getOpcode()) {
283 NewOpcode = (isU6) ? XCore::LDWSP_ru6 : XCore::LDWSP_lru6;
284 BuildMI(MBB, II, dl, TII.get(NewOpcode), Reg)
288 NewOpcode = (isU6) ? XCore::STWSP_ru6 : XCore::STWSP_lru6;
289 BuildMI(MBB, II, dl, TII.get(NewOpcode))
290 .addReg(Reg, getKillRegState(isKill))
294 NewOpcode = (isU6) ? XCore::LDAWSP_ru6 : XCore::LDAWSP_lru6;
295 BuildMI(MBB, II, dl, TII.get(NewOpcode), Reg)
299 llvm_unreachable("Unexpected Opcode");
302 // Erase old instruction.
306 void XCoreRegisterInfo::
307 loadConstant(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
308 unsigned DstReg, int64_t Value, DebugLoc dl) const {
309 // TODO use mkmsk if possible.
310 if (!isImmU16(Value)) {
311 // TODO use constant pool.
312 report_fatal_error("loadConstant value too big " + Twine(Value));
314 int Opcode = isImmU6(Value) ? XCore::LDC_ru6 : XCore::LDC_lru6;
315 BuildMI(MBB, I, dl, TII.get(Opcode), DstReg).addImm(Value);
318 int XCoreRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
319 return XCoreGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
322 int XCoreRegisterInfo::getLLVMRegNum(unsigned DwarfRegNo, bool isEH) const {
323 return XCoreGenRegisterInfo::getLLVMRegNumFull(DwarfRegNo,0);
326 unsigned XCoreRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
327 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
329 return TFI->hasFP(MF) ? XCore::R10 : XCore::SP;
332 unsigned XCoreRegisterInfo::getRARegister() const {