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/IR/Function.h"
30 #include "llvm/IR/Type.h"
31 #include "llvm/MC/MachineLocation.h"
32 #include "llvm/Support/Debug.h"
33 #include "llvm/Support/ErrorHandling.h"
34 #include "llvm/Support/raw_ostream.h"
35 #include "llvm/Target/TargetInstrInfo.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()
45 : HexagonGenRegisterInfo(Hexagon::R31) {}
48 bool HexagonRegisterInfo::isEHReturnCalleeSaveReg(unsigned R) const {
49 return R == Hexagon::R0 || R == Hexagon::R1 || R == Hexagon::R2 ||
50 R == Hexagon::R3 || R == Hexagon::D0 || R == Hexagon::D1;
53 bool HexagonRegisterInfo::isCalleeSaveReg(unsigned Reg) const {
54 return Hexagon::R16 <= Reg && Reg <= Hexagon::R27;
59 HexagonRegisterInfo::getCallerSavedRegs(const MachineFunction *MF,
60 const TargetRegisterClass *RC) const {
61 using namespace Hexagon;
63 static const MCPhysReg Int32[] = {
64 R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, 0
66 static const MCPhysReg Int64[] = {
67 D0, D1, D2, D3, D4, D5, D6, D7, 0
69 static const MCPhysReg Pred[] = {
72 static const MCPhysReg VecSgl[] = {
73 V0, V1, V2, V3, V4, V5, V6, V7, V8, V9, V10, V11, V12, V13,
74 V14, V15, V16, V17, V18, V19, V20, V21, V22, V23, V24, V25, V26, V27,
77 static const MCPhysReg VecDbl[] = {
78 W0, W1, W2, W3, W4, W5, W6, W7, W8, W9, W10, W11, W12, W13, W14, W15, 0
81 switch (RC->getID()) {
82 case IntRegsRegClassID:
84 case DoubleRegsRegClassID:
86 case PredRegsRegClassID:
88 case VectorRegsRegClassID:
89 case VectorRegs128BRegClassID:
91 case VecDblRegsRegClassID:
92 case VecDblRegs128BRegClassID:
98 static const MCPhysReg Empty[] = { 0 };
100 dbgs() << "Register class: " << getRegClassName(RC) << "\n";
102 llvm_unreachable("Unexpected register class");
108 HexagonRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
109 static const MCPhysReg CalleeSavedRegsV3[] = {
110 Hexagon::R16, Hexagon::R17, Hexagon::R18, Hexagon::R19,
111 Hexagon::R20, Hexagon::R21, Hexagon::R22, Hexagon::R23,
112 Hexagon::R24, Hexagon::R25, Hexagon::R26, Hexagon::R27, 0
115 // Functions that contain a call to __builtin_eh_return also save the first 4
116 // parameter registers.
117 static const MCPhysReg CalleeSavedRegsV3EHReturn[] = {
118 Hexagon::R0, Hexagon::R1, Hexagon::R2, Hexagon::R3,
119 Hexagon::R16, Hexagon::R17, Hexagon::R18, Hexagon::R19,
120 Hexagon::R20, Hexagon::R21, Hexagon::R22, Hexagon::R23,
121 Hexagon::R24, Hexagon::R25, Hexagon::R26, Hexagon::R27, 0
124 bool HasEHReturn = MF->getInfo<HexagonMachineFunctionInfo>()->hasEHReturn();
126 switch (MF->getSubtarget<HexagonSubtarget>().getHexagonArchVersion()) {
127 case HexagonSubtarget::V4:
128 case HexagonSubtarget::V5:
129 case HexagonSubtarget::V55:
130 case HexagonSubtarget::V60:
131 case HexagonSubtarget::V62:
132 return HasEHReturn ? CalleeSavedRegsV3EHReturn : CalleeSavedRegsV3;
135 llvm_unreachable("Callee saved registers requested for unknown architecture "
140 const uint32_t *HexagonRegisterInfo::getCallPreservedMask(
141 const MachineFunction &MF, CallingConv::ID) const {
142 return HexagonCSR_RegMask;
146 BitVector HexagonRegisterInfo::getReservedRegs(const MachineFunction &MF)
148 BitVector Reserved(getNumRegs());
149 Reserved.set(Hexagon::R29);
150 Reserved.set(Hexagon::R30);
151 Reserved.set(Hexagon::R31);
152 // Control registers.
153 Reserved.set(Hexagon::SA0); // C0
154 Reserved.set(Hexagon::LC0); // C1
155 Reserved.set(Hexagon::SA1); // C2
156 Reserved.set(Hexagon::LC1); // C3
157 Reserved.set(Hexagon::P3_0); // C4
158 Reserved.set(Hexagon::USR); // C8
159 Reserved.set(Hexagon::PC); // C9
160 Reserved.set(Hexagon::UGP); // C10
161 Reserved.set(Hexagon::GP); // C11
162 Reserved.set(Hexagon::CS0); // C12
163 Reserved.set(Hexagon::CS1); // C13
164 Reserved.set(Hexagon::UPCYCLELO); // C14
165 Reserved.set(Hexagon::UPCYCLEHI); // C15
166 Reserved.set(Hexagon::FRAMELIMIT); // C16
167 Reserved.set(Hexagon::FRAMEKEY); // C17
168 Reserved.set(Hexagon::PKTCOUNTLO); // C18
169 Reserved.set(Hexagon::PKTCOUNTHI); // C19
170 Reserved.set(Hexagon::UTIMERLO); // C30
171 Reserved.set(Hexagon::UTIMERHI); // C31
172 // Out of the control registers, only C8 is explicitly defined in
173 // HexagonRegisterInfo.td. If others are defined, make sure to add
174 // them here as well.
175 Reserved.set(Hexagon::C8);
176 Reserved.set(Hexagon::USR_OVF);
178 for (int x = Reserved.find_first(); x >= 0; x = Reserved.find_next(x))
179 markSuperRegs(Reserved, x);
185 void HexagonRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
186 int SPAdj, unsigned FIOp,
187 RegScavenger *RS) const {
189 // Hexagon_TODO: Do we need to enforce this for Hexagon?
190 assert(SPAdj == 0 && "Unexpected");
192 MachineInstr &MI = *II;
193 MachineBasicBlock &MB = *MI.getParent();
194 MachineFunction &MF = *MB.getParent();
195 auto &HST = MF.getSubtarget<HexagonSubtarget>();
196 auto &HII = *HST.getInstrInfo();
197 auto &HFI = *HST.getFrameLowering();
200 int FI = MI.getOperand(FIOp).getIndex();
201 // Select the base pointer (BP) and calculate the actual offset from BP
202 // to the beginning of the object at index FI.
203 int Offset = HFI.getFrameIndexReference(MF, FI, BP);
204 // Add the offset from the instruction.
205 int RealOffset = Offset + MI.getOperand(FIOp+1).getImm();
208 unsigned Opc = MI.getOpcode();
210 case Hexagon::PS_fia:
211 MI.setDesc(HII.get(Hexagon::A2_addi));
212 MI.getOperand(FIOp).ChangeToImmediate(RealOffset);
213 MI.RemoveOperand(FIOp+1);
216 // Set up the instruction for updating below.
217 MI.setDesc(HII.get(Hexagon::A2_addi));
221 if (!HII.isValidOffset(Opc, RealOffset)) {
222 // If the offset is not valid, calculate the address in a temporary
223 // register and use it with offset 0.
224 auto &MRI = MF.getRegInfo();
225 unsigned TmpR = MRI.createVirtualRegister(&Hexagon::IntRegsRegClass);
226 const DebugLoc &DL = MI.getDebugLoc();
227 BuildMI(MB, II, DL, HII.get(Hexagon::A2_addi), TmpR)
235 MI.getOperand(FIOp).ChangeToRegister(BP, false, false, IsKill);
236 MI.getOperand(FIOp+1).ChangeToImmediate(RealOffset);
240 unsigned HexagonRegisterInfo::getRARegister() const {
245 unsigned HexagonRegisterInfo::getFrameRegister(const MachineFunction
247 const HexagonFrameLowering *TFI = getFrameLowering(MF);
249 return getFrameRegister();
250 return getStackRegister();
254 unsigned HexagonRegisterInfo::getFrameRegister() const {
259 unsigned HexagonRegisterInfo::getStackRegister() const {
264 unsigned HexagonRegisterInfo::getHexagonSubRegIndex(
265 const TargetRegisterClass *RC, unsigned GenIdx) const {
266 assert(GenIdx == Hexagon::ps_sub_lo || GenIdx == Hexagon::ps_sub_hi);
268 static const unsigned ISub[] = { Hexagon::isub_lo, Hexagon::isub_hi };
269 static const unsigned VSub[] = { Hexagon::vsub_lo, Hexagon::vsub_hi };
271 switch (RC->getID()) {
272 case Hexagon::CtrRegs64RegClassID:
273 case Hexagon::DoubleRegsRegClassID:
275 case Hexagon::VecDblRegsRegClassID:
276 case Hexagon::VecDblRegs128BRegClassID:
280 if (const TargetRegisterClass *SuperRC = *RC->getSuperClasses())
281 return getHexagonSubRegIndex(SuperRC, GenIdx);
283 llvm_unreachable("Invalid register class");
286 bool HexagonRegisterInfo::useFPForScavengingIndex(const MachineFunction &MF)
288 return MF.getSubtarget<HexagonSubtarget>().getFrameLowering()->hasFP(MF);
292 unsigned HexagonRegisterInfo::getFirstCallerSavedNonParamReg() const {