1 //===-- HexagonRegisterInfo.cpp - Hexagon 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 Hexagon implementation of the TargetRegisterInfo
13 //===----------------------------------------------------------------------===//
15 #include "HexagonRegisterInfo.h"
17 #include "HexagonMachineFunctionInfo.h"
18 #include "HexagonSubtarget.h"
19 #include "HexagonTargetMachine.h"
20 #include "llvm/ADT/BitVector.h"
21 #include "llvm/ADT/STLExtras.h"
22 #include "llvm/CodeGen/MachineFrameInfo.h"
23 #include "llvm/CodeGen/MachineFunction.h"
24 #include "llvm/CodeGen/MachineFunctionPass.h"
25 #include "llvm/CodeGen/MachineInstrBuilder.h"
26 #include "llvm/CodeGen/MachineRegisterInfo.h"
27 #include "llvm/CodeGen/PseudoSourceValue.h"
28 #include "llvm/CodeGen/RegisterScavenging.h"
29 #include "llvm/CodeGen/TargetInstrInfo.h"
30 #include "llvm/IR/Function.h"
31 #include "llvm/IR/Type.h"
32 #include "llvm/MC/MachineLocation.h"
33 #include "llvm/Support/Debug.h"
34 #include "llvm/Support/ErrorHandling.h"
35 #include "llvm/Support/raw_ostream.h"
36 #include "llvm/Target/TargetMachine.h"
37 #include "llvm/Target/TargetOptions.h"
39 #define GET_REGINFO_TARGET_DESC
40 #include "HexagonGenRegisterInfo.inc"
44 HexagonRegisterInfo::HexagonRegisterInfo(unsigned HwMode)
45 : HexagonGenRegisterInfo(Hexagon::R31, 0/*DwarfFlavor*/, 0/*EHFlavor*/,
49 bool HexagonRegisterInfo::isEHReturnCalleeSaveReg(unsigned R) const {
50 return R == Hexagon::R0 || R == Hexagon::R1 || R == Hexagon::R2 ||
51 R == Hexagon::R3 || R == Hexagon::D0 || R == Hexagon::D1;
55 HexagonRegisterInfo::getCallerSavedRegs(const MachineFunction *MF,
56 const TargetRegisterClass *RC) const {
57 using namespace Hexagon;
59 static const MCPhysReg Int32[] = {
60 R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, 0
62 static const MCPhysReg Int64[] = {
63 D0, D1, D2, D3, D4, D5, D6, D7, 0
65 static const MCPhysReg Pred[] = {
68 static const MCPhysReg VecSgl[] = {
69 V0, V1, V2, V3, V4, V5, V6, V7, V8, V9, V10, V11, V12, V13,
70 V14, V15, V16, V17, V18, V19, V20, V21, V22, V23, V24, V25, V26, V27,
73 static const MCPhysReg VecDbl[] = {
74 W0, W1, W2, W3, W4, W5, W6, W7, W8, W9, W10, W11, W12, W13, W14, W15, 0
77 switch (RC->getID()) {
78 case IntRegsRegClassID:
80 case DoubleRegsRegClassID:
82 case PredRegsRegClassID:
92 static const MCPhysReg Empty[] = { 0 };
94 dbgs() << "Register class: " << getRegClassName(RC) << "\n";
96 llvm_unreachable("Unexpected register class");
102 HexagonRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
103 static const MCPhysReg CalleeSavedRegsV3[] = {
104 Hexagon::R16, Hexagon::R17, Hexagon::R18, Hexagon::R19,
105 Hexagon::R20, Hexagon::R21, Hexagon::R22, Hexagon::R23,
106 Hexagon::R24, Hexagon::R25, Hexagon::R26, Hexagon::R27, 0
109 // Functions that contain a call to __builtin_eh_return also save the first 4
110 // parameter registers.
111 static const MCPhysReg CalleeSavedRegsV3EHReturn[] = {
112 Hexagon::R0, Hexagon::R1, Hexagon::R2, Hexagon::R3,
113 Hexagon::R16, Hexagon::R17, Hexagon::R18, Hexagon::R19,
114 Hexagon::R20, Hexagon::R21, Hexagon::R22, Hexagon::R23,
115 Hexagon::R24, Hexagon::R25, Hexagon::R26, Hexagon::R27, 0
118 bool HasEHReturn = MF->getInfo<HexagonMachineFunctionInfo>()->hasEHReturn();
120 switch (MF->getSubtarget<HexagonSubtarget>().getHexagonArchVersion()) {
121 case Hexagon::ArchEnum::V4:
122 case Hexagon::ArchEnum::V5:
123 case Hexagon::ArchEnum::V55:
124 case Hexagon::ArchEnum::V60:
125 case Hexagon::ArchEnum::V62:
126 case Hexagon::ArchEnum::V65:
127 return HasEHReturn ? CalleeSavedRegsV3EHReturn : CalleeSavedRegsV3;
130 llvm_unreachable("Callee saved registers requested for unknown architecture "
135 const uint32_t *HexagonRegisterInfo::getCallPreservedMask(
136 const MachineFunction &MF, CallingConv::ID) const {
137 return HexagonCSR_RegMask;
141 BitVector HexagonRegisterInfo::getReservedRegs(const MachineFunction &MF)
143 BitVector Reserved(getNumRegs());
144 Reserved.set(Hexagon::R29);
145 Reserved.set(Hexagon::R30);
146 Reserved.set(Hexagon::R31);
147 Reserved.set(Hexagon::VTMP);
148 // Control registers.
149 Reserved.set(Hexagon::SA0); // C0
150 Reserved.set(Hexagon::LC0); // C1
151 Reserved.set(Hexagon::SA1); // C2
152 Reserved.set(Hexagon::LC1); // C3
153 Reserved.set(Hexagon::P3_0); // C4
154 Reserved.set(Hexagon::USR); // C8
155 Reserved.set(Hexagon::PC); // C9
156 Reserved.set(Hexagon::UGP); // C10
157 Reserved.set(Hexagon::GP); // C11
158 Reserved.set(Hexagon::CS0); // C12
159 Reserved.set(Hexagon::CS1); // C13
160 Reserved.set(Hexagon::UPCYCLELO); // C14
161 Reserved.set(Hexagon::UPCYCLEHI); // C15
162 Reserved.set(Hexagon::FRAMELIMIT); // C16
163 Reserved.set(Hexagon::FRAMEKEY); // C17
164 Reserved.set(Hexagon::PKTCOUNTLO); // C18
165 Reserved.set(Hexagon::PKTCOUNTHI); // C19
166 Reserved.set(Hexagon::UTIMERLO); // C30
167 Reserved.set(Hexagon::UTIMERHI); // C31
168 // Out of the control registers, only C8 is explicitly defined in
169 // HexagonRegisterInfo.td. If others are defined, make sure to add
170 // them here as well.
171 Reserved.set(Hexagon::C8);
172 Reserved.set(Hexagon::USR_OVF);
174 for (int x = Reserved.find_first(); x >= 0; x = Reserved.find_next(x))
175 markSuperRegs(Reserved, x);
181 void HexagonRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
182 int SPAdj, unsigned FIOp,
183 RegScavenger *RS) const {
185 // Hexagon_TODO: Do we need to enforce this for Hexagon?
186 assert(SPAdj == 0 && "Unexpected");
188 MachineInstr &MI = *II;
189 MachineBasicBlock &MB = *MI.getParent();
190 MachineFunction &MF = *MB.getParent();
191 auto &HST = MF.getSubtarget<HexagonSubtarget>();
192 auto &HII = *HST.getInstrInfo();
193 auto &HFI = *HST.getFrameLowering();
196 int FI = MI.getOperand(FIOp).getIndex();
197 // Select the base pointer (BP) and calculate the actual offset from BP
198 // to the beginning of the object at index FI.
199 int Offset = HFI.getFrameIndexReference(MF, FI, BP);
200 // Add the offset from the instruction.
201 int RealOffset = Offset + MI.getOperand(FIOp+1).getImm();
204 unsigned Opc = MI.getOpcode();
206 case Hexagon::PS_fia:
207 MI.setDesc(HII.get(Hexagon::A2_addi));
208 MI.getOperand(FIOp).ChangeToImmediate(RealOffset);
209 MI.RemoveOperand(FIOp+1);
212 // Set up the instruction for updating below.
213 MI.setDesc(HII.get(Hexagon::A2_addi));
217 if (!HII.isValidOffset(Opc, RealOffset, this)) {
218 // If the offset is not valid, calculate the address in a temporary
219 // register and use it with offset 0.
220 auto &MRI = MF.getRegInfo();
221 unsigned TmpR = MRI.createVirtualRegister(&Hexagon::IntRegsRegClass);
222 const DebugLoc &DL = MI.getDebugLoc();
223 BuildMI(MB, II, DL, HII.get(Hexagon::A2_addi), TmpR)
231 MI.getOperand(FIOp).ChangeToRegister(BP, false, false, IsKill);
232 MI.getOperand(FIOp+1).ChangeToImmediate(RealOffset);
236 unsigned HexagonRegisterInfo::getRARegister() const {
241 unsigned HexagonRegisterInfo::getFrameRegister(const MachineFunction
243 const HexagonFrameLowering *TFI = getFrameLowering(MF);
245 return getFrameRegister();
246 return getStackRegister();
250 unsigned HexagonRegisterInfo::getFrameRegister() const {
255 unsigned HexagonRegisterInfo::getStackRegister() const {
260 unsigned HexagonRegisterInfo::getHexagonSubRegIndex(
261 const TargetRegisterClass &RC, unsigned GenIdx) const {
262 assert(GenIdx == Hexagon::ps_sub_lo || GenIdx == Hexagon::ps_sub_hi);
264 static const unsigned ISub[] = { Hexagon::isub_lo, Hexagon::isub_hi };
265 static const unsigned VSub[] = { Hexagon::vsub_lo, Hexagon::vsub_hi };
267 switch (RC.getID()) {
268 case Hexagon::CtrRegs64RegClassID:
269 case Hexagon::DoubleRegsRegClassID:
271 case Hexagon::HvxWRRegClassID:
275 if (const TargetRegisterClass *SuperRC = *RC.getSuperClasses())
276 return getHexagonSubRegIndex(*SuperRC, GenIdx);
278 llvm_unreachable("Invalid register class");
281 bool HexagonRegisterInfo::useFPForScavengingIndex(const MachineFunction &MF)
283 return MF.getSubtarget<HexagonSubtarget>().getFrameLowering()->hasFP(MF);
286 const TargetRegisterClass *
287 HexagonRegisterInfo::getPointerRegClass(const MachineFunction &MF,
288 unsigned Kind) const {
289 return &Hexagon::IntRegsRegClass;
292 unsigned HexagonRegisterInfo::getFirstCallerSavedNonParamReg() const {