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1//===- HexagonBitTracker.cpp ----------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "HexagonBitTracker.h"10#include "HexagonInstrInfo.h"11#include "HexagonRegisterInfo.h"12#include "HexagonSubtarget.h"13#include "llvm/CodeGen/MachineFrameInfo.h"14#include "llvm/CodeGen/MachineFunction.h"15#include "llvm/CodeGen/MachineInstr.h"16#include "llvm/CodeGen/MachineOperand.h"17#include "llvm/CodeGen/MachineRegisterInfo.h"18#include "llvm/IR/Argument.h"19#include "llvm/IR/Attributes.h"20#include "llvm/IR/Function.h"21#include "llvm/IR/Type.h"22#include "llvm/Support/Compiler.h"23#include "llvm/Support/Debug.h"24#include "llvm/Support/ErrorHandling.h"25 26using namespace llvm;27 28using BT = BitTracker;29 30HexagonEvaluator::HexagonEvaluator(const HexagonRegisterInfo &tri,31                                   MachineRegisterInfo &mri,32                                   const HexagonInstrInfo &tii,33                                   MachineFunction &mf)34    : MachineEvaluator(tri, mri), MF(mf), MFI(mf.getFrameInfo()), TII(tii) {35  // Populate the VRX map (VR to extension-type).36  // Go over all the formal parameters of the function. If a given parameter37  // P is sign- or zero-extended, locate the virtual register holding that38  // parameter and create an entry in the VRX map indicating the type of ex-39  // tension (and the source type).40  // This is a bit complicated to do accurately, since the memory layout in-41  // formation is necessary to precisely determine whether an aggregate para-42  // meter will be passed in a register or in memory. What is given in MRI43  // is the association between the physical register that is live-in (i.e.44  // holds an argument), and the virtual register that this value will be45  // copied into. This, by itself, is not sufficient to map back the virtual46  // register to a formal parameter from Function (since consecutive live-ins47  // from MRI may not correspond to consecutive formal parameters from Func-48  // tion). To avoid the complications with in-memory arguments, only consi-49  // der the initial sequence of formal parameters that are known to be50  // passed via registers.51  unsigned InVirtReg, InPhysReg = 0;52 53  for (const Argument &Arg : MF.getFunction().args()) {54    Type *ATy = Arg.getType();55    unsigned Width = 0;56    if (ATy->isIntegerTy())57      Width = ATy->getIntegerBitWidth();58    else if (ATy->isPointerTy())59      Width = 32;60    // If pointer size is not set through target data, it will default to61    // Module::AnyPointerSize.62    if (Width == 0 || Width > 64)63      break;64    if (Arg.hasAttribute(Attribute::ByVal))65      continue;66    InPhysReg = getNextPhysReg(InPhysReg, Width);67    if (!InPhysReg)68      break;69    InVirtReg = getVirtRegFor(InPhysReg);70    if (!InVirtReg)71      continue;72    if (Arg.hasAttribute(Attribute::SExt))73      VRX.insert(std::make_pair(InVirtReg, ExtType(ExtType::SExt, Width)));74    else if (Arg.hasAttribute(Attribute::ZExt))75      VRX.insert(std::make_pair(InVirtReg, ExtType(ExtType::ZExt, Width)));76  }77}78 79BT::BitMask HexagonEvaluator::mask(Register Reg, unsigned Sub) const {80  if (Sub == 0)81    return MachineEvaluator::mask(Reg, 0);82  const TargetRegisterClass &RC = *MRI.getRegClass(Reg);83  unsigned ID = RC.getID();84  uint16_t RW = getRegBitWidth(RegisterRef(Reg, Sub));85  const auto &HRI = static_cast<const HexagonRegisterInfo&>(TRI);86  bool IsSubLo = (Sub == HRI.getHexagonSubRegIndex(RC, Hexagon::ps_sub_lo));87  switch (ID) {88    case Hexagon::DoubleRegsRegClassID:89    case Hexagon::DoubleRegs_with_isub_hi_in_IntRegsLow8RegClassID:90    case Hexagon::HvxWRRegClassID:91    case Hexagon::HvxVQRRegClassID:92      return IsSubLo ? BT::BitMask(0, RW-1)93                     : BT::BitMask(RW, 2*RW-1);94    default:95      break;96  }97#ifndef NDEBUG98  dbgs() << printReg(Reg, &TRI, Sub) << " in reg class "99         << TRI.getRegClassName(&RC) << '\n';100#endif101  llvm_unreachable("Unexpected register/subregister");102}103 104uint16_t HexagonEvaluator::getPhysRegBitWidth(MCRegister Reg) const {105  using namespace Hexagon;106  const auto &HST = MF.getSubtarget<HexagonSubtarget>();107  if (HST.useHVXOps()) {108    for (auto &RC : {HvxVRRegClass, HvxWRRegClass, HvxQRRegClass,109                     HvxVQRRegClass})110      if (RC.contains(Reg))111        return TRI.getRegSizeInBits(RC);112  }113  // Default treatment for other physical registers.114  if (const TargetRegisterClass *RC = TRI.getMinimalPhysRegClass(Reg))115    return TRI.getRegSizeInBits(*RC);116 117  llvm_unreachable(118      (Twine("Unhandled physical register") + TRI.getName(Reg)).str().c_str());119}120 121const TargetRegisterClass &HexagonEvaluator::composeWithSubRegIndex(122      const TargetRegisterClass &RC, unsigned Idx) const {123  if (Idx == 0)124    return RC;125 126#ifndef NDEBUG127  const auto &HRI = static_cast<const HexagonRegisterInfo&>(TRI);128  bool IsSubLo = (Idx == HRI.getHexagonSubRegIndex(RC, Hexagon::ps_sub_lo));129  bool IsSubHi = (Idx == HRI.getHexagonSubRegIndex(RC, Hexagon::ps_sub_hi));130  assert(IsSubLo != IsSubHi && "Must refer to either low or high subreg");131#endif132 133  switch (RC.getID()) {134    case Hexagon::DoubleRegsRegClassID:135    case Hexagon::DoubleRegs_with_isub_hi_in_IntRegsLow8RegClassID:136      return Hexagon::IntRegsRegClass;137    case Hexagon::HvxWRRegClassID:138      return Hexagon::HvxVRRegClass;139    case Hexagon::HvxVQRRegClassID:140      return Hexagon::HvxWRRegClass;141    default:142      break;143  }144#ifndef NDEBUG145  dbgs() << "Reg class id: " << RC.getID() << " idx: " << Idx << '\n';146#endif147  llvm_unreachable("Unimplemented combination of reg class/subreg idx");148}149 150namespace {151 152class RegisterRefs {153  std::vector<BT::RegisterRef> Vector;154 155public:156  RegisterRefs(const MachineInstr &MI) : Vector(MI.getNumOperands()) {157    for (unsigned i = 0, n = Vector.size(); i < n; ++i) {158      const MachineOperand &MO = MI.getOperand(i);159      if (MO.isReg())160        Vector[i] = BT::RegisterRef(MO);161      // For indices that don't correspond to registers, the entry will162      // remain constructed via the default constructor.163    }164  }165 166  size_t size() const { return Vector.size(); }167 168  const BT::RegisterRef &operator[](unsigned n) const {169    // The main purpose of this operator is to assert with bad argument.170    assert(n < Vector.size());171    return Vector[n];172  }173};174 175} // end anonymous namespace176 177bool HexagonEvaluator::evaluate(const MachineInstr &MI,178                                const CellMapType &Inputs,179                                CellMapType &Outputs) const {180  using namespace Hexagon;181 182  unsigned NumDefs = 0;183 184  // Basic correctness check: there should not be any defs with subregisters.185  for (const MachineOperand &MO : MI.operands()) {186    if (!MO.isReg() || !MO.isDef())187      continue;188    NumDefs++;189    assert(MO.getSubReg() == 0);190  }191 192  if (NumDefs == 0)193    return false;194 195  unsigned Opc = MI.getOpcode();196 197  if (MI.mayLoad()) {198    switch (Opc) {199      // These instructions may be marked as mayLoad, but they are generating200      // immediate values, so skip them.201      case CONST32:202      case CONST64:203        break;204      default:205        return evaluateLoad(MI, Inputs, Outputs);206    }207  }208 209  // Check COPY instructions that copy formal parameters into virtual210  // registers. Such parameters can be sign- or zero-extended at the211  // call site, and we should take advantage of this knowledge. The MRI212  // keeps a list of pairs of live-in physical and virtual registers,213  // which provides information about which virtual registers will hold214  // the argument values. The function will still contain instructions215  // defining those virtual registers, and in practice those are COPY216  // instructions from a physical to a virtual register. In such cases,217  // applying the argument extension to the virtual register can be seen218  // as simply mirroring the extension that had already been applied to219  // the physical register at the call site. If the defining instruction220  // was not a COPY, it would not be clear how to mirror that extension221  // on the callee's side. For that reason, only check COPY instructions222  // for potential extensions.223  if (MI.isCopy()) {224    if (evaluateFormalCopy(MI, Inputs, Outputs))225      return true;226  }227 228  // Beyond this point, if any operand is a global, skip that instruction.229  // The reason is that certain instructions that can take an immediate230  // operand can also have a global symbol in that operand. To avoid231  // checking what kind of operand a given instruction has individually232  // for each instruction, do it here. Global symbols as operands gene-233  // rally do not provide any useful information.234  for (const MachineOperand &MO : MI.operands()) {235    if (MO.isGlobal() || MO.isBlockAddress() || MO.isSymbol() || MO.isJTI() ||236        MO.isCPI())237      return false;238  }239 240  RegisterRefs Reg(MI);241#define op(i) MI.getOperand(i)242#define rc(i) RegisterCell::ref(getCell(Reg[i], Inputs))243#define im(i) MI.getOperand(i).getImm()244 245  // If the instruction has no register operands, skip it.246  if (Reg.size() == 0)247    return false;248 249  // Record result for register in operand 0.250  auto rr0 = [this,Reg] (const BT::RegisterCell &Val, CellMapType &Outputs)251        -> bool {252    putCell(Reg[0], Val, Outputs);253    return true;254  };255  // Get the cell corresponding to the N-th operand.256  auto cop = [this, &Reg, &MI, &Inputs](unsigned N,257                                        uint16_t W) -> BT::RegisterCell {258    const MachineOperand &Op = MI.getOperand(N);259    if (Op.isImm())260      return eIMM(Op.getImm(), W);261    if (!Op.isReg())262      return RegisterCell::self(0, W);263    assert(getRegBitWidth(Reg[N]) == W && "Register width mismatch");264    return rc(N);265  };266  // Extract RW low bits of the cell.267  auto lo = [this] (const BT::RegisterCell &RC, uint16_t RW)268        -> BT::RegisterCell {269    assert(RW <= RC.width());270    return eXTR(RC, 0, RW);271  };272  // Extract RW high bits of the cell.273  auto hi = [this] (const BT::RegisterCell &RC, uint16_t RW)274        -> BT::RegisterCell {275    uint16_t W = RC.width();276    assert(RW <= W);277    return eXTR(RC, W-RW, W);278  };279  // Extract N-th halfword (counting from the least significant position).280  auto half = [this] (const BT::RegisterCell &RC, unsigned N)281        -> BT::RegisterCell {282    assert(N*16+16 <= RC.width());283    return eXTR(RC, N*16, N*16+16);284  };285  // Shuffle bits (pick even/odd from cells and merge into result).286  auto shuffle = [this] (const BT::RegisterCell &Rs, const BT::RegisterCell &Rt,287                         uint16_t BW, bool Odd) -> BT::RegisterCell {288    uint16_t I = Odd, Ws = Rs.width();289    assert(Ws == Rt.width());290    RegisterCell RC = eXTR(Rt, I*BW, I*BW+BW).cat(eXTR(Rs, I*BW, I*BW+BW));291    I += 2;292    while (I*BW < Ws) {293      RC.cat(eXTR(Rt, I*BW, I*BW+BW)).cat(eXTR(Rs, I*BW, I*BW+BW));294      I += 2;295    }296    return RC;297  };298 299  // The bitwidth of the 0th operand. In most (if not all) of the300  // instructions below, the 0th operand is the defined register.301  // Pre-compute the bitwidth here, because it is needed in many cases302  // cases below.303  uint16_t W0 = (Reg[0].Reg != 0) ? getRegBitWidth(Reg[0]) : 0;304 305  // Register id of the 0th operand. It can be 0.306  unsigned Reg0 = Reg[0].Reg;307 308  switch (Opc) {309    // Transfer immediate:310 311    case A2_tfrsi:312    case A2_tfrpi:313    case CONST32:314    case CONST64:315      return rr0(eIMM(im(1), W0), Outputs);316    case PS_false:317      return rr0(RegisterCell(W0).fill(0, W0, BT::BitValue::Zero), Outputs);318    case PS_true:319      return rr0(RegisterCell(W0).fill(0, W0, BT::BitValue::One), Outputs);320    case PS_fi: {321      int FI = op(1).getIndex();322      int Off = op(2).getImm();323      unsigned A = MFI.getObjectAlign(FI).value() + std::abs(Off);324      unsigned L = llvm::countr_zero(A);325      RegisterCell RC = RegisterCell::self(Reg[0].Reg, W0);326      RC.fill(0, L, BT::BitValue::Zero);327      return rr0(RC, Outputs);328    }329 330    // Transfer register:331 332    case A2_tfr:333    case A2_tfrp:334    case C2_pxfer_map:335      return rr0(rc(1), Outputs);336    case C2_tfrpr: {337      uint16_t RW = W0;338      uint16_t PW = 8; // XXX Pred size: getRegBitWidth(Reg[1]);339      assert(PW <= RW);340      RegisterCell PC = eXTR(rc(1), 0, PW);341      RegisterCell RC = RegisterCell(RW).insert(PC, BT::BitMask(0, PW-1));342      RC.fill(PW, RW, BT::BitValue::Zero);343      return rr0(RC, Outputs);344    }345    case C2_tfrrp: {346      uint16_t RW = W0;347      uint16_t PW = 8; // XXX Pred size: getRegBitWidth(Reg[1]);348      RegisterCell RC = RegisterCell::self(Reg[0].Reg, RW);349      RC.fill(PW, RW, BT::BitValue::Zero);350      return rr0(eINS(RC, eXTR(rc(1), 0, PW), 0), Outputs);351    }352 353    // Arithmetic:354 355    case A2_abs:356    case A2_absp:357      // TODO358      break;359 360    case A2_addsp: {361      uint16_t W1 = getRegBitWidth(Reg[1]);362      assert(W0 == 64 && W1 == 32);363      RegisterCell CW = RegisterCell(W0).insert(rc(1), BT::BitMask(0, W1-1));364      RegisterCell RC = eADD(eSXT(CW, W1), rc(2));365      return rr0(RC, Outputs);366    }367    case A2_add:368    case A2_addp:369      return rr0(eADD(rc(1), rc(2)), Outputs);370    case A2_addi:371      return rr0(eADD(rc(1), eIMM(im(2), W0)), Outputs);372    case S4_addi_asl_ri: {373      RegisterCell RC = eADD(eIMM(im(1), W0), eASL(rc(2), im(3)));374      return rr0(RC, Outputs);375    }376    case S4_addi_lsr_ri: {377      RegisterCell RC = eADD(eIMM(im(1), W0), eLSR(rc(2), im(3)));378      return rr0(RC, Outputs);379    }380    case S4_addaddi: {381      RegisterCell RC = eADD(rc(1), eADD(rc(2), eIMM(im(3), W0)));382      return rr0(RC, Outputs);383    }384    case M4_mpyri_addi: {385      RegisterCell M = eMLS(rc(2), eIMM(im(3), W0));386      RegisterCell RC = eADD(eIMM(im(1), W0), lo(M, W0));387      return rr0(RC, Outputs);388    }389    case M4_mpyrr_addi: {390      RegisterCell M = eMLS(rc(2), rc(3));391      RegisterCell RC = eADD(eIMM(im(1), W0), lo(M, W0));392      return rr0(RC, Outputs);393    }394    case M4_mpyri_addr_u2: {395      RegisterCell M = eMLS(eIMM(im(2), W0), rc(3));396      RegisterCell RC = eADD(rc(1), lo(M, W0));397      return rr0(RC, Outputs);398    }399    case M4_mpyri_addr: {400      RegisterCell M = eMLS(rc(2), eIMM(im(3), W0));401      RegisterCell RC = eADD(rc(1), lo(M, W0));402      return rr0(RC, Outputs);403    }404    case M4_mpyrr_addr: {405      RegisterCell M = eMLS(rc(2), rc(3));406      RegisterCell RC = eADD(rc(1), lo(M, W0));407      return rr0(RC, Outputs);408    }409    case S4_subaddi: {410      RegisterCell RC = eADD(rc(1), eSUB(eIMM(im(2), W0), rc(3)));411      return rr0(RC, Outputs);412    }413    case M2_accii: {414      RegisterCell RC = eADD(rc(1), eADD(rc(2), eIMM(im(3), W0)));415      return rr0(RC, Outputs);416    }417    case M2_acci: {418      RegisterCell RC = eADD(rc(1), eADD(rc(2), rc(3)));419      return rr0(RC, Outputs);420    }421    case M2_subacc: {422      RegisterCell RC = eADD(rc(1), eSUB(rc(2), rc(3)));423      return rr0(RC, Outputs);424    }425    case S2_addasl_rrri: {426      RegisterCell RC = eADD(rc(1), eASL(rc(2), im(3)));427      return rr0(RC, Outputs);428    }429    case C4_addipc: {430      RegisterCell RPC = RegisterCell::self(Reg[0].Reg, W0);431      RPC.fill(0, 2, BT::BitValue::Zero);432      return rr0(eADD(RPC, eIMM(im(2), W0)), Outputs);433    }434    case A2_sub:435    case A2_subp:436      return rr0(eSUB(rc(1), rc(2)), Outputs);437    case A2_subri:438      return rr0(eSUB(eIMM(im(1), W0), rc(2)), Outputs);439    case S4_subi_asl_ri: {440      RegisterCell RC = eSUB(eIMM(im(1), W0), eASL(rc(2), im(3)));441      return rr0(RC, Outputs);442    }443    case S4_subi_lsr_ri: {444      RegisterCell RC = eSUB(eIMM(im(1), W0), eLSR(rc(2), im(3)));445      return rr0(RC, Outputs);446    }447    case M2_naccii: {448      RegisterCell RC = eSUB(rc(1), eADD(rc(2), eIMM(im(3), W0)));449      return rr0(RC, Outputs);450    }451    case M2_nacci: {452      RegisterCell RC = eSUB(rc(1), eADD(rc(2), rc(3)));453      return rr0(RC, Outputs);454    }455    // 32-bit negation is done by "Rd = A2_subri 0, Rs"456    case A2_negp:457      return rr0(eSUB(eIMM(0, W0), rc(1)), Outputs);458 459    case M2_mpy_up: {460      RegisterCell M = eMLS(rc(1), rc(2));461      return rr0(hi(M, W0), Outputs);462    }463    case M2_dpmpyss_s0:464      return rr0(eMLS(rc(1), rc(2)), Outputs);465    case M2_dpmpyss_acc_s0:466      return rr0(eADD(rc(1), eMLS(rc(2), rc(3))), Outputs);467    case M2_dpmpyss_nac_s0:468      return rr0(eSUB(rc(1), eMLS(rc(2), rc(3))), Outputs);469    case M2_mpyi: {470      RegisterCell M = eMLS(rc(1), rc(2));471      return rr0(lo(M, W0), Outputs);472    }473    case M2_macsip: {474      RegisterCell M = eMLS(rc(2), eIMM(im(3), W0));475      RegisterCell RC = eADD(rc(1), lo(M, W0));476      return rr0(RC, Outputs);477    }478    case M2_macsin: {479      RegisterCell M = eMLS(rc(2), eIMM(im(3), W0));480      RegisterCell RC = eSUB(rc(1), lo(M, W0));481      return rr0(RC, Outputs);482    }483    case M2_maci: {484      RegisterCell M = eMLS(rc(2), rc(3));485      RegisterCell RC = eADD(rc(1), lo(M, W0));486      return rr0(RC, Outputs);487    }488    case M2_mnaci: {489      RegisterCell M = eMLS(rc(2), rc(3));490      RegisterCell RC = eSUB(rc(1), lo(M, W0));491      return rr0(RC, Outputs);492    }493    case M2_mpysmi: {494      RegisterCell M = eMLS(rc(1), eIMM(im(2), W0));495      return rr0(lo(M, 32), Outputs);496    }497    case M2_mpysin: {498      RegisterCell M = eMLS(rc(1), eIMM(-im(2), W0));499      return rr0(lo(M, 32), Outputs);500    }501    case M2_mpysip: {502      RegisterCell M = eMLS(rc(1), eIMM(im(2), W0));503      return rr0(lo(M, 32), Outputs);504    }505    case M2_mpyu_up: {506      RegisterCell M = eMLU(rc(1), rc(2));507      return rr0(hi(M, W0), Outputs);508    }509    case M2_dpmpyuu_s0:510      return rr0(eMLU(rc(1), rc(2)), Outputs);511    case M2_dpmpyuu_acc_s0:512      return rr0(eADD(rc(1), eMLU(rc(2), rc(3))), Outputs);513    case M2_dpmpyuu_nac_s0:514      return rr0(eSUB(rc(1), eMLU(rc(2), rc(3))), Outputs);515    //case M2_mpysu_up:516 517    // Logical/bitwise:518 519    case A2_andir:520      return rr0(eAND(rc(1), eIMM(im(2), W0)), Outputs);521    case A2_and:522    case A2_andp:523      return rr0(eAND(rc(1), rc(2)), Outputs);524    case A4_andn:525    case A4_andnp:526      return rr0(eAND(rc(1), eNOT(rc(2))), Outputs);527    case S4_andi_asl_ri: {528      RegisterCell RC = eAND(eIMM(im(1), W0), eASL(rc(2), im(3)));529      return rr0(RC, Outputs);530    }531    case S4_andi_lsr_ri: {532      RegisterCell RC = eAND(eIMM(im(1), W0), eLSR(rc(2), im(3)));533      return rr0(RC, Outputs);534    }535    case M4_and_and:536      return rr0(eAND(rc(1), eAND(rc(2), rc(3))), Outputs);537    case M4_and_andn:538      return rr0(eAND(rc(1), eAND(rc(2), eNOT(rc(3)))), Outputs);539    case M4_and_or:540      return rr0(eAND(rc(1), eORL(rc(2), rc(3))), Outputs);541    case M4_and_xor:542      return rr0(eAND(rc(1), eXOR(rc(2), rc(3))), Outputs);543    case A2_orir:544      return rr0(eORL(rc(1), eIMM(im(2), W0)), Outputs);545    case A2_or:546    case A2_orp:547      return rr0(eORL(rc(1), rc(2)), Outputs);548    case A4_orn:549    case A4_ornp:550      return rr0(eORL(rc(1), eNOT(rc(2))), Outputs);551    case S4_ori_asl_ri: {552      RegisterCell RC = eORL(eIMM(im(1), W0), eASL(rc(2), im(3)));553      return rr0(RC, Outputs);554    }555    case S4_ori_lsr_ri: {556      RegisterCell RC = eORL(eIMM(im(1), W0), eLSR(rc(2), im(3)));557      return rr0(RC, Outputs);558    }559    case M4_or_and:560      return rr0(eORL(rc(1), eAND(rc(2), rc(3))), Outputs);561    case M4_or_andn:562      return rr0(eORL(rc(1), eAND(rc(2), eNOT(rc(3)))), Outputs);563    case S4_or_andi:564    case S4_or_andix: {565      RegisterCell RC = eORL(rc(1), eAND(rc(2), eIMM(im(3), W0)));566      return rr0(RC, Outputs);567    }568    case S4_or_ori: {569      RegisterCell RC = eORL(rc(1), eORL(rc(2), eIMM(im(3), W0)));570      return rr0(RC, Outputs);571    }572    case M4_or_or:573      return rr0(eORL(rc(1), eORL(rc(2), rc(3))), Outputs);574    case M4_or_xor:575      return rr0(eORL(rc(1), eXOR(rc(2), rc(3))), Outputs);576    case A2_xor:577    case A2_xorp:578      return rr0(eXOR(rc(1), rc(2)), Outputs);579    case M4_xor_and:580      return rr0(eXOR(rc(1), eAND(rc(2), rc(3))), Outputs);581    case M4_xor_andn:582      return rr0(eXOR(rc(1), eAND(rc(2), eNOT(rc(3)))), Outputs);583    case M4_xor_or:584      return rr0(eXOR(rc(1), eORL(rc(2), rc(3))), Outputs);585    case M4_xor_xacc:586      return rr0(eXOR(rc(1), eXOR(rc(2), rc(3))), Outputs);587    case A2_not:588    case A2_notp:589      return rr0(eNOT(rc(1)), Outputs);590 591    case S2_asl_i_r:592    case S2_asl_i_p:593      return rr0(eASL(rc(1), im(2)), Outputs);594    case A2_aslh:595      return rr0(eASL(rc(1), 16), Outputs);596    case S2_asl_i_r_acc:597    case S2_asl_i_p_acc:598      return rr0(eADD(rc(1), eASL(rc(2), im(3))), Outputs);599    case S2_asl_i_r_nac:600    case S2_asl_i_p_nac:601      return rr0(eSUB(rc(1), eASL(rc(2), im(3))), Outputs);602    case S2_asl_i_r_and:603    case S2_asl_i_p_and:604      return rr0(eAND(rc(1), eASL(rc(2), im(3))), Outputs);605    case S2_asl_i_r_or:606    case S2_asl_i_p_or:607      return rr0(eORL(rc(1), eASL(rc(2), im(3))), Outputs);608    case S2_asl_i_r_xacc:609    case S2_asl_i_p_xacc:610      return rr0(eXOR(rc(1), eASL(rc(2), im(3))), Outputs);611    case S2_asl_i_vh:612    case S2_asl_i_vw:613      // TODO614      break;615 616    case S2_asr_i_r:617    case S2_asr_i_p:618      return rr0(eASR(rc(1), im(2)), Outputs);619    case A2_asrh:620      return rr0(eASR(rc(1), 16), Outputs);621    case S2_asr_i_r_acc:622    case S2_asr_i_p_acc:623      return rr0(eADD(rc(1), eASR(rc(2), im(3))), Outputs);624    case S2_asr_i_r_nac:625    case S2_asr_i_p_nac:626      return rr0(eSUB(rc(1), eASR(rc(2), im(3))), Outputs);627    case S2_asr_i_r_and:628    case S2_asr_i_p_and:629      return rr0(eAND(rc(1), eASR(rc(2), im(3))), Outputs);630    case S2_asr_i_r_or:631    case S2_asr_i_p_or:632      return rr0(eORL(rc(1), eASR(rc(2), im(3))), Outputs);633    case S2_asr_i_r_rnd: {634      // The input is first sign-extended to 64 bits, then the output635      // is truncated back to 32 bits.636      assert(W0 == 32);637      RegisterCell XC = eSXT(rc(1).cat(eIMM(0, W0)), W0);638      RegisterCell RC = eASR(eADD(eASR(XC, im(2)), eIMM(1, 2*W0)), 1);639      return rr0(eXTR(RC, 0, W0), Outputs);640    }641    case S2_asr_i_r_rnd_goodsyntax: {642      int64_t S = im(2);643      if (S == 0)644        return rr0(rc(1), Outputs);645      // Result: S2_asr_i_r_rnd Rs, u5-1646      RegisterCell XC = eSXT(rc(1).cat(eIMM(0, W0)), W0);647      RegisterCell RC = eLSR(eADD(eASR(XC, S-1), eIMM(1, 2*W0)), 1);648      return rr0(eXTR(RC, 0, W0), Outputs);649    }650    case S2_asr_r_vh:651    case S2_asr_i_vw:652    case S2_asr_i_svw_trun:653      // TODO654      break;655 656    case S2_lsr_i_r:657    case S2_lsr_i_p:658      return rr0(eLSR(rc(1), im(2)), Outputs);659    case S2_lsr_i_r_acc:660    case S2_lsr_i_p_acc:661      return rr0(eADD(rc(1), eLSR(rc(2), im(3))), Outputs);662    case S2_lsr_i_r_nac:663    case S2_lsr_i_p_nac:664      return rr0(eSUB(rc(1), eLSR(rc(2), im(3))), Outputs);665    case S2_lsr_i_r_and:666    case S2_lsr_i_p_and:667      return rr0(eAND(rc(1), eLSR(rc(2), im(3))), Outputs);668    case S2_lsr_i_r_or:669    case S2_lsr_i_p_or:670      return rr0(eORL(rc(1), eLSR(rc(2), im(3))), Outputs);671    case S2_lsr_i_r_xacc:672    case S2_lsr_i_p_xacc:673      return rr0(eXOR(rc(1), eLSR(rc(2), im(3))), Outputs);674 675    case S2_clrbit_i: {676      RegisterCell RC = rc(1);677      RC[im(2)] = BT::BitValue::Zero;678      return rr0(RC, Outputs);679    }680    case S2_setbit_i: {681      RegisterCell RC = rc(1);682      RC[im(2)] = BT::BitValue::One;683      return rr0(RC, Outputs);684    }685    case S2_togglebit_i: {686      RegisterCell RC = rc(1);687      uint16_t BX = im(2);688      RC[BX] = RC[BX].is(0) ? BT::BitValue::One689                            : RC[BX].is(1) ? BT::BitValue::Zero690                                           : BT::BitValue::self();691      return rr0(RC, Outputs);692    }693 694    case A4_bitspliti: {695      uint16_t W1 = getRegBitWidth(Reg[1]);696      uint16_t BX = im(2);697      // Res.uw[1] = Rs[bx+1:], Res.uw[0] = Rs[0:bx]698      const BT::BitValue Zero = BT::BitValue::Zero;699      RegisterCell RZ = RegisterCell(W0).fill(BX, W1, Zero)700                                        .fill(W1+(W1-BX), W0, Zero);701      RegisterCell BF1 = eXTR(rc(1), 0, BX), BF2 = eXTR(rc(1), BX, W1);702      RegisterCell RC = eINS(eINS(RZ, BF1, 0), BF2, W1);703      return rr0(RC, Outputs);704    }705    case S4_extract:706    case S4_extractp:707    case S2_extractu:708    case S2_extractup: {709      uint16_t Wd = im(2), Of = im(3);710      assert(Wd <= W0);711      if (Wd == 0)712        return rr0(eIMM(0, W0), Outputs);713      // If the width extends beyond the register size, pad the register714      // with 0 bits.715      RegisterCell Pad = (Wd+Of > W0) ? rc(1).cat(eIMM(0, Wd+Of-W0)) : rc(1);716      RegisterCell Ext = eXTR(Pad, Of, Wd+Of);717      // Ext is short, need to extend it with 0s or sign bit.718      RegisterCell RC = RegisterCell(W0).insert(Ext, BT::BitMask(0, Wd-1));719      if (Opc == S2_extractu || Opc == S2_extractup)720        return rr0(eZXT(RC, Wd), Outputs);721      return rr0(eSXT(RC, Wd), Outputs);722    }723    case S2_insert:724    case S2_insertp: {725      uint16_t Wd = im(3), Of = im(4);726      assert(Wd < W0 && Of < W0);727      // If Wd+Of exceeds W0, the inserted bits are truncated.728      if (Wd+Of > W0)729        Wd = W0-Of;730      if (Wd == 0)731        return rr0(rc(1), Outputs);732      return rr0(eINS(rc(1), eXTR(rc(2), 0, Wd), Of), Outputs);733    }734 735    // Bit permutations:736 737    case A2_combineii:738    case A4_combineii:739    case A4_combineir:740    case A4_combineri:741    case A2_combinew:742    case V6_vcombine:743      assert(W0 % 2 == 0);744      return rr0(cop(2, W0/2).cat(cop(1, W0/2)), Outputs);745    case A2_combine_ll:746    case A2_combine_lh:747    case A2_combine_hl:748    case A2_combine_hh: {749      assert(W0 == 32);750      assert(getRegBitWidth(Reg[1]) == 32 && getRegBitWidth(Reg[2]) == 32);751      // Low half in the output is 0 for _ll and _hl, 1 otherwise:752      unsigned LoH = !(Opc == A2_combine_ll || Opc == A2_combine_hl);753      // High half in the output is 0 for _ll and _lh, 1 otherwise:754      unsigned HiH = !(Opc == A2_combine_ll || Opc == A2_combine_lh);755      RegisterCell R1 = rc(1);756      RegisterCell R2 = rc(2);757      RegisterCell RC = half(R2, LoH).cat(half(R1, HiH));758      return rr0(RC, Outputs);759    }760    case S2_packhl: {761      assert(W0 == 64);762      assert(getRegBitWidth(Reg[1]) == 32 && getRegBitWidth(Reg[2]) == 32);763      RegisterCell R1 = rc(1);764      RegisterCell R2 = rc(2);765      RegisterCell RC = half(R2, 0).cat(half(R1, 0)).cat(half(R2, 1))766                                   .cat(half(R1, 1));767      return rr0(RC, Outputs);768    }769    case S2_shuffeb: {770      RegisterCell RC = shuffle(rc(1), rc(2), 8, false);771      return rr0(RC, Outputs);772    }773    case S2_shuffeh: {774      RegisterCell RC = shuffle(rc(1), rc(2), 16, false);775      return rr0(RC, Outputs);776    }777    case S2_shuffob: {778      RegisterCell RC = shuffle(rc(1), rc(2), 8, true);779      return rr0(RC, Outputs);780    }781    case S2_shuffoh: {782      RegisterCell RC = shuffle(rc(1), rc(2), 16, true);783      return rr0(RC, Outputs);784    }785    case C2_mask: {786      uint16_t WR = W0;787      uint16_t WP = 8; // XXX Pred size: getRegBitWidth(Reg[1]);788      assert(WR == 64 && WP == 8);789      RegisterCell R1 = rc(1);790      RegisterCell RC(WR);791      for (uint16_t i = 0; i < WP; ++i) {792        const BT::BitValue &V = R1[i];793        BT::BitValue F = (V.is(0) || V.is(1)) ? V : BT::BitValue::self();794        RC.fill(i*8, i*8+8, F);795      }796      return rr0(RC, Outputs);797    }798 799    // Mux:800 801    case C2_muxii:802    case C2_muxir:803    case C2_muxri:804    case C2_mux: {805      BT::BitValue PC0 = rc(1)[0];806      RegisterCell R2 = cop(2, W0);807      RegisterCell R3 = cop(3, W0);808      if (PC0.is(0) || PC0.is(1))809        return rr0(RegisterCell::ref(PC0 ? R2 : R3), Outputs);810      R2.meet(R3, Reg[0].Reg);811      return rr0(R2, Outputs);812    }813    case C2_vmux:814      // TODO815      break;816 817    // Sign- and zero-extension:818 819    case A2_sxtb:820      return rr0(eSXT(rc(1), 8), Outputs);821    case A2_sxth:822      return rr0(eSXT(rc(1), 16), Outputs);823    case A2_sxtw: {824      uint16_t W1 = getRegBitWidth(Reg[1]);825      assert(W0 == 64 && W1 == 32);826      RegisterCell RC = eSXT(rc(1).cat(eIMM(0, W1)), W1);827      return rr0(RC, Outputs);828    }829    case A2_zxtb:830      return rr0(eZXT(rc(1), 8), Outputs);831    case A2_zxth:832      return rr0(eZXT(rc(1), 16), Outputs);833 834    // Saturations835 836    case A2_satb:837      return rr0(eSXT(RegisterCell::self(0, W0).regify(Reg0), 8), Outputs);838    case A2_sath:839      return rr0(eSXT(RegisterCell::self(0, W0).regify(Reg0), 16), Outputs);840    case A2_satub:841      return rr0(eZXT(RegisterCell::self(0, W0).regify(Reg0), 8), Outputs);842    case A2_satuh:843      return rr0(eZXT(RegisterCell::self(0, W0).regify(Reg0), 16), Outputs);844 845    // Bit count:846 847    case S2_cl0:848    case S2_cl0p:849      // Always produce a 32-bit result.850      return rr0(eCLB(rc(1), false/*bit*/, 32), Outputs);851    case S2_cl1:852    case S2_cl1p:853      return rr0(eCLB(rc(1), true/*bit*/, 32), Outputs);854    case S2_clb:855    case S2_clbp: {856      uint16_t W1 = getRegBitWidth(Reg[1]);857      RegisterCell R1 = rc(1);858      BT::BitValue TV = R1[W1-1];859      if (TV.is(0) || TV.is(1))860        return rr0(eCLB(R1, TV, 32), Outputs);861      break;862    }863    case S2_ct0:864    case S2_ct0p:865      return rr0(eCTB(rc(1), false/*bit*/, 32), Outputs);866    case S2_ct1:867    case S2_ct1p:868      return rr0(eCTB(rc(1), true/*bit*/, 32), Outputs);869    case S5_popcountp:870      // TODO871      break;872 873    case C2_all8: {874      RegisterCell P1 = rc(1);875      bool Has0 = false, All1 = true;876      for (uint16_t i = 0; i < 8/*XXX*/; ++i) {877        if (!P1[i].is(1))878          All1 = false;879        if (!P1[i].is(0))880          continue;881        Has0 = true;882        break;883      }884      if (!Has0 && !All1)885        break;886      RegisterCell RC(W0);887      RC.fill(0, W0, (All1 ? BT::BitValue::One : BT::BitValue::Zero));888      return rr0(RC, Outputs);889    }890    case C2_any8: {891      RegisterCell P1 = rc(1);892      bool Has1 = false, All0 = true;893      for (uint16_t i = 0; i < 8/*XXX*/; ++i) {894        if (!P1[i].is(0))895          All0 = false;896        if (!P1[i].is(1))897          continue;898        Has1 = true;899        break;900      }901      if (!Has1 && !All0)902        break;903      RegisterCell RC(W0);904      RC.fill(0, W0, (Has1 ? BT::BitValue::One : BT::BitValue::Zero));905      return rr0(RC, Outputs);906    }907    case C2_and:908      return rr0(eAND(rc(1), rc(2)), Outputs);909    case C2_andn:910      return rr0(eAND(rc(1), eNOT(rc(2))), Outputs);911    case C2_not:912      return rr0(eNOT(rc(1)), Outputs);913    case C2_or:914      return rr0(eORL(rc(1), rc(2)), Outputs);915    case C2_orn:916      return rr0(eORL(rc(1), eNOT(rc(2))), Outputs);917    case C2_xor:918      return rr0(eXOR(rc(1), rc(2)), Outputs);919    case C4_and_and:920      return rr0(eAND(rc(1), eAND(rc(2), rc(3))), Outputs);921    case C4_and_andn:922      return rr0(eAND(rc(1), eAND(rc(2), eNOT(rc(3)))), Outputs);923    case C4_and_or:924      return rr0(eAND(rc(1), eORL(rc(2), rc(3))), Outputs);925    case C4_and_orn:926      return rr0(eAND(rc(1), eORL(rc(2), eNOT(rc(3)))), Outputs);927    case C4_or_and:928      return rr0(eORL(rc(1), eAND(rc(2), rc(3))), Outputs);929    case C4_or_andn:930      return rr0(eORL(rc(1), eAND(rc(2), eNOT(rc(3)))), Outputs);931    case C4_or_or:932      return rr0(eORL(rc(1), eORL(rc(2), rc(3))), Outputs);933    case C4_or_orn:934      return rr0(eORL(rc(1), eORL(rc(2), eNOT(rc(3)))), Outputs);935    case C2_bitsclr:936    case C2_bitsclri:937    case C2_bitsset:938    case C4_nbitsclr:939    case C4_nbitsclri:940    case C4_nbitsset:941      // TODO942      break;943    case S2_tstbit_i:944    case S4_ntstbit_i: {945      BT::BitValue V = rc(1)[im(2)];946      if (V.is(0) || V.is(1)) {947        // If instruction is S2_tstbit_i, test for 1, otherwise test for 0.948        bool TV = (Opc == S2_tstbit_i);949        BT::BitValue F = V.is(TV) ? BT::BitValue::One : BT::BitValue::Zero;950        return rr0(RegisterCell(W0).fill(0, W0, F), Outputs);951      }952      break;953    }954 955    default:956      // For instructions that define a single predicate registers, store957      // the low 8 bits of the register only.958      if (unsigned DefR = getUniqueDefVReg(MI)) {959        if (MRI.getRegClass(DefR) == &Hexagon::PredRegsRegClass) {960          BT::RegisterRef PD(DefR, 0);961          uint16_t RW = getRegBitWidth(PD);962          uint16_t PW = 8; // XXX Pred size: getRegBitWidth(Reg[1]);963          RegisterCell RC = RegisterCell::self(DefR, RW);964          RC.fill(PW, RW, BT::BitValue::Zero);965          putCell(PD, RC, Outputs);966          return true;967        }968      }969      return MachineEvaluator::evaluate(MI, Inputs, Outputs);970  }971  #undef im972  #undef rc973  #undef op974  return false;975}976 977bool HexagonEvaluator::evaluate(const MachineInstr &BI,978                                const CellMapType &Inputs,979                                BranchTargetList &Targets,980                                bool &FallsThru) const {981  // We need to evaluate one branch at a time. TII::analyzeBranch checks982  // all the branches in a basic block at once, so we cannot use it.983  unsigned Opc = BI.getOpcode();984  bool SimpleBranch = false;985  bool Negated = false;986  switch (Opc) {987    case Hexagon::J2_jumpf:988    case Hexagon::J2_jumpfpt:989    case Hexagon::J2_jumpfnew:990    case Hexagon::J2_jumpfnewpt:991      Negated = true;992      [[fallthrough]];993    case Hexagon::J2_jumpt:994    case Hexagon::J2_jumptpt:995    case Hexagon::J2_jumptnew:996    case Hexagon::J2_jumptnewpt:997      // Simple branch:  if([!]Pn) jump ...998      // i.e. Op0 = predicate, Op1 = branch target.999      SimpleBranch = true;1000      break;1001    case Hexagon::J2_jump:1002      Targets.insert(BI.getOperand(0).getMBB());1003      FallsThru = false;1004      return true;1005    default:1006      // If the branch is of unknown type, assume that all successors are1007      // executable.1008      return false;1009  }1010 1011  if (!SimpleBranch)1012    return false;1013 1014  // BI is a conditional branch if we got here.1015  RegisterRef PR = BI.getOperand(0);1016  RegisterCell PC = getCell(PR, Inputs);1017  const BT::BitValue &Test = PC[0];1018 1019  // If the condition is neither true nor false, then it's unknown.1020  if (!Test.is(0) && !Test.is(1))1021    return false;1022 1023  // "Test.is(!Negated)" means "branch condition is true".1024  if (!Test.is(!Negated)) {1025    // Condition known to be false.1026    FallsThru = true;1027    return true;1028  }1029 1030  Targets.insert(BI.getOperand(1).getMBB());1031  FallsThru = false;1032  return true;1033}1034 1035unsigned HexagonEvaluator::getUniqueDefVReg(const MachineInstr &MI) const {1036  unsigned DefReg = 0;1037  for (const MachineOperand &Op : MI.operands()) {1038    if (!Op.isReg() || !Op.isDef())1039      continue;1040    Register R = Op.getReg();1041    if (!R.isVirtual())1042      continue;1043    if (DefReg != 0)1044      return 0;1045    DefReg = R;1046  }1047  return DefReg;1048}1049 1050bool HexagonEvaluator::evaluateLoad(const MachineInstr &MI,1051                                    const CellMapType &Inputs,1052                                    CellMapType &Outputs) const {1053  using namespace Hexagon;1054 1055  if (TII.isPredicated(MI))1056    return false;1057  assert(MI.mayLoad() && "A load that mayn't?");1058  unsigned Opc = MI.getOpcode();1059 1060  uint16_t BitNum;1061  bool SignEx;1062 1063  switch (Opc) {1064    default:1065      return false;1066 1067#if 01068    // memb_fifo1069    case L2_loadalignb_pbr:1070    case L2_loadalignb_pcr:1071    case L2_loadalignb_pi:1072    // memh_fifo1073    case L2_loadalignh_pbr:1074    case L2_loadalignh_pcr:1075    case L2_loadalignh_pi:1076    // membh1077    case L2_loadbsw2_pbr:1078    case L2_loadbsw2_pci:1079    case L2_loadbsw2_pcr:1080    case L2_loadbsw2_pi:1081    case L2_loadbsw4_pbr:1082    case L2_loadbsw4_pci:1083    case L2_loadbsw4_pcr:1084    case L2_loadbsw4_pi:1085    // memubh1086    case L2_loadbzw2_pbr:1087    case L2_loadbzw2_pci:1088    case L2_loadbzw2_pcr:1089    case L2_loadbzw2_pi:1090    case L2_loadbzw4_pbr:1091    case L2_loadbzw4_pci:1092    case L2_loadbzw4_pcr:1093    case L2_loadbzw4_pi:1094#endif1095 1096    case L2_loadrbgp:1097    case L2_loadrb_io:1098    case L2_loadrb_pbr:1099    case L2_loadrb_pci:1100    case L2_loadrb_pcr:1101    case L2_loadrb_pi:1102    case PS_loadrbabs:1103    case L4_loadrb_ap:1104    case L4_loadrb_rr:1105    case L4_loadrb_ur:1106      BitNum = 8;1107      SignEx = true;1108      break;1109 1110    case L2_loadrubgp:1111    case L2_loadrub_io:1112    case L2_loadrub_pbr:1113    case L2_loadrub_pci:1114    case L2_loadrub_pcr:1115    case L2_loadrub_pi:1116    case PS_loadrubabs:1117    case L4_loadrub_ap:1118    case L4_loadrub_rr:1119    case L4_loadrub_ur:1120      BitNum = 8;1121      SignEx = false;1122      break;1123 1124    case L2_loadrhgp:1125    case L2_loadrh_io:1126    case L2_loadrh_pbr:1127    case L2_loadrh_pci:1128    case L2_loadrh_pcr:1129    case L2_loadrh_pi:1130    case PS_loadrhabs:1131    case L4_loadrh_ap:1132    case L4_loadrh_rr:1133    case L4_loadrh_ur:1134      BitNum = 16;1135      SignEx = true;1136      break;1137 1138    case L2_loadruhgp:1139    case L2_loadruh_io:1140    case L2_loadruh_pbr:1141    case L2_loadruh_pci:1142    case L2_loadruh_pcr:1143    case L2_loadruh_pi:1144    case L4_loadruh_rr:1145    case PS_loadruhabs:1146    case L4_loadruh_ap:1147    case L4_loadruh_ur:1148      BitNum = 16;1149      SignEx = false;1150      break;1151 1152    case L2_loadrigp:1153    case L2_loadri_io:1154    case L2_loadri_pbr:1155    case L2_loadri_pci:1156    case L2_loadri_pcr:1157    case L2_loadri_pi:1158    case L2_loadw_locked:1159    case PS_loadriabs:1160    case L4_loadri_ap:1161    case L4_loadri_rr:1162    case L4_loadri_ur:1163    case LDriw_pred:1164      BitNum = 32;1165      SignEx = true;1166      break;1167 1168    case L2_loadrdgp:1169    case L2_loadrd_io:1170    case L2_loadrd_pbr:1171    case L2_loadrd_pci:1172    case L2_loadrd_pcr:1173    case L2_loadrd_pi:1174    case L4_loadd_locked:1175    case PS_loadrdabs:1176    case L4_loadrd_ap:1177    case L4_loadrd_rr:1178    case L4_loadrd_ur:1179      BitNum = 64;1180      SignEx = true;1181      break;1182  }1183 1184  const MachineOperand &MD = MI.getOperand(0);1185  assert(MD.isReg() && MD.isDef());1186  RegisterRef RD = MD;1187 1188  uint16_t W = getRegBitWidth(RD);1189  assert(W >= BitNum && BitNum > 0);1190  RegisterCell Res(W);1191 1192  for (uint16_t i = 0; i < BitNum; ++i)1193    Res[i] = BT::BitValue::self(BT::BitRef(RD.Reg, i));1194 1195  if (SignEx) {1196    const BT::BitValue &Sign = Res[BitNum-1];1197    for (uint16_t i = BitNum; i < W; ++i)1198      Res[i] = BT::BitValue::ref(Sign);1199  } else {1200    for (uint16_t i = BitNum; i < W; ++i)1201      Res[i] = BT::BitValue::Zero;1202  }1203 1204  putCell(RD, Res, Outputs);1205  return true;1206}1207 1208bool HexagonEvaluator::evaluateFormalCopy(const MachineInstr &MI,1209                                          const CellMapType &Inputs,1210                                          CellMapType &Outputs) const {1211  // If MI defines a formal parameter, but is not a copy (loads are handled1212  // in evaluateLoad), then it's not clear what to do.1213  assert(MI.isCopy());1214 1215  RegisterRef RD = MI.getOperand(0);1216  RegisterRef RS = MI.getOperand(1);1217  assert(RD.Sub == 0);1218  if (!RS.Reg.isPhysical())1219    return false;1220  RegExtMap::const_iterator F = VRX.find(RD.Reg);1221  if (F == VRX.end())1222    return false;1223 1224  uint16_t EW = F->second.Width;1225  // Store RD's cell into the map. This will associate the cell with a virtual1226  // register, and make zero-/sign-extends possible (otherwise we would be ex-1227  // tending "self" bit values, which will have no effect, since "self" values1228  // cannot be references to anything).1229  putCell(RD, getCell(RS, Inputs), Outputs);1230 1231  RegisterCell Res;1232  // Read RD's cell from the outputs instead of RS's cell from the inputs:1233  if (F->second.Type == ExtType::SExt)1234    Res = eSXT(getCell(RD, Outputs), EW);1235  else if (F->second.Type == ExtType::ZExt)1236    Res = eZXT(getCell(RD, Outputs), EW);1237 1238  putCell(RD, Res, Outputs);1239  return true;1240}1241 1242unsigned HexagonEvaluator::getNextPhysReg(unsigned PReg, unsigned Width) const {1243  using namespace Hexagon;1244 1245  bool Is64 = DoubleRegsRegClass.contains(PReg);1246  assert(PReg == 0 || Is64 || IntRegsRegClass.contains(PReg));1247 1248  static const unsigned Phys32[] = { R0, R1, R2, R3, R4, R5 };1249  static const unsigned Phys64[] = { D0, D1, D2 };1250  const unsigned Num32 = sizeof(Phys32)/sizeof(unsigned);1251  const unsigned Num64 = sizeof(Phys64)/sizeof(unsigned);1252 1253  // Return the first parameter register of the required width.1254  if (PReg == 0)1255    return (Width <= 32) ? Phys32[0] : Phys64[0];1256 1257  // Set Idx32, Idx64 in such a way that Idx+1 would give the index of the1258  // next register.1259  unsigned Idx32 = 0, Idx64 = 0;1260  if (!Is64) {1261    while (Idx32 < Num32) {1262      if (Phys32[Idx32] == PReg)1263        break;1264      Idx32++;1265    }1266    Idx64 = Idx32/2;1267  } else {1268    while (Idx64 < Num64) {1269      if (Phys64[Idx64] == PReg)1270        break;1271      Idx64++;1272    }1273    Idx32 = Idx64*2+1;1274  }1275 1276  if (Width <= 32)1277    return (Idx32+1 < Num32) ? Phys32[Idx32+1] : 0;1278  return (Idx64+1 < Num64) ? Phys64[Idx64+1] : 0;1279}1280 1281unsigned HexagonEvaluator::getVirtRegFor(unsigned PReg) const {1282  for (std::pair<MCRegister, Register> P : MRI.liveins())1283    if (P.first == PReg)1284      return P.second;1285  return 0;1286}1287