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/CommandLine.h"
33 #include "llvm/Support/Debug.h"
34 #include "llvm/Support/ErrorHandling.h"
35 #include "llvm/Support/raw_ostream.h"
36 #include "llvm/Target/TargetInstrInfo.h"
37 #include "llvm/Target/TargetMachine.h"
38 #include "llvm/Target/TargetOptions.h"
42 HexagonRegisterInfo::HexagonRegisterInfo()
43 : HexagonGenRegisterInfo(Hexagon::R31) {}
46 bool HexagonRegisterInfo::isEHReturnCalleeSaveReg(unsigned R) const {
47 return R == Hexagon::R0 || R == Hexagon::R1 || R == Hexagon::R2 ||
48 R == Hexagon::R3 || R == Hexagon::D0 || R == Hexagon::D1;
51 bool HexagonRegisterInfo::isCalleeSaveReg(unsigned Reg) const {
52 return Hexagon::R16 <= Reg && Reg <= Hexagon::R27;
57 HexagonRegisterInfo::getCallerSavedRegs(const MachineFunction *MF) const {
58 static const MCPhysReg CallerSavedRegsV4[] = {
59 Hexagon::R0, Hexagon::R1, Hexagon::R2, Hexagon::R3, Hexagon::R4,
60 Hexagon::R5, Hexagon::R6, Hexagon::R7, Hexagon::R8, Hexagon::R9,
61 Hexagon::R10, Hexagon::R11, Hexagon::R12, Hexagon::R13, Hexagon::R14,
65 auto &HST = static_cast<const HexagonSubtarget&>(MF->getSubtarget());
66 switch (HST.getHexagonArchVersion()) {
67 case HexagonSubtarget::V4:
68 case HexagonSubtarget::V5:
69 case HexagonSubtarget::V55:
70 case HexagonSubtarget::V60:
71 return CallerSavedRegsV4;
74 "Callee saved registers requested for unknown archtecture version");
79 HexagonRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
80 static const MCPhysReg CalleeSavedRegsV3[] = {
81 Hexagon::R16, Hexagon::R17, Hexagon::R18, Hexagon::R19,
82 Hexagon::R20, Hexagon::R21, Hexagon::R22, Hexagon::R23,
83 Hexagon::R24, Hexagon::R25, Hexagon::R26, Hexagon::R27, 0
86 switch (MF->getSubtarget<HexagonSubtarget>().getHexagonArchVersion()) {
87 case HexagonSubtarget::V4:
88 case HexagonSubtarget::V5:
89 case HexagonSubtarget::V55:
90 case HexagonSubtarget::V60:
91 return CalleeSavedRegsV3;
93 llvm_unreachable("Callee saved registers requested for unknown architecture "
97 BitVector HexagonRegisterInfo::getReservedRegs(const MachineFunction &MF)
99 BitVector Reserved(getNumRegs());
100 Reserved.set(HEXAGON_RESERVED_REG_1);
101 Reserved.set(HEXAGON_RESERVED_REG_2);
102 Reserved.set(Hexagon::R29);
103 Reserved.set(Hexagon::R30);
104 Reserved.set(Hexagon::R31);
105 Reserved.set(Hexagon::D14);
106 Reserved.set(Hexagon::D15);
107 Reserved.set(Hexagon::LC0);
108 Reserved.set(Hexagon::LC1);
109 Reserved.set(Hexagon::SA0);
110 Reserved.set(Hexagon::SA1);
115 void HexagonRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
116 int SPAdj, unsigned FIOp,
117 RegScavenger *RS) const {
119 // Hexagon_TODO: Do we need to enforce this for Hexagon?
120 assert(SPAdj == 0 && "Unexpected");
122 MachineInstr &MI = *II;
123 MachineBasicBlock &MB = *MI.getParent();
124 MachineFunction &MF = *MB.getParent();
125 auto &HST = MF.getSubtarget<HexagonSubtarget>();
126 auto &HII = *HST.getInstrInfo();
127 auto &HFI = *HST.getFrameLowering();
130 int FI = MI.getOperand(FIOp).getIndex();
131 // Select the base pointer (BP) and calculate the actual offset from BP
132 // to the beginning of the object at index FI.
133 int Offset = HFI.getFrameIndexReference(MF, FI, BP);
134 // Add the offset from the instruction.
135 int RealOffset = Offset + MI.getOperand(FIOp+1).getImm();
137 unsigned Opc = MI.getOpcode();
139 case Hexagon::TFR_FIA:
140 MI.setDesc(HII.get(Hexagon::A2_addi));
141 MI.getOperand(FIOp).ChangeToImmediate(RealOffset);
142 MI.RemoveOperand(FIOp+1);
144 case Hexagon::TFR_FI:
145 // Set up the instruction for updating below.
146 MI.setDesc(HII.get(Hexagon::A2_addi));
150 if (HII.isValidOffset(Opc, RealOffset)) {
151 MI.getOperand(FIOp).ChangeToRegister(BP, false);
152 MI.getOperand(FIOp+1).ChangeToImmediate(RealOffset);
157 const Function *F = MF.getFunction();
158 dbgs() << "In function ";
159 if (F) dbgs() << F->getName();
160 else dbgs() << "<?>";
161 dbgs() << ", BB#" << MB.getNumber() << "\n" << MI;
163 llvm_unreachable("Unhandled instruction");
167 unsigned HexagonRegisterInfo::getRARegister() const {
172 unsigned HexagonRegisterInfo::getFrameRegister(const MachineFunction
174 const HexagonFrameLowering *TFI = getFrameLowering(MF);
176 return getFrameRegister();
177 return getStackRegister();
181 unsigned HexagonRegisterInfo::getFrameRegister() const {
186 unsigned HexagonRegisterInfo::getStackRegister() const {
191 bool HexagonRegisterInfo::useFPForScavengingIndex(const MachineFunction &MF)
193 return MF.getSubtarget<HexagonSubtarget>().getFrameLowering()->hasFP(MF);
197 unsigned HexagonRegisterInfo::getFirstCallerSavedNonParamReg() const {
202 #define GET_REGINFO_TARGET_DESC
203 #include "HexagonGenRegisterInfo.inc"