SIInstrInfo.cpp

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//===- SIInstrInfo.cpp - SI Instruction Information  ----------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
/// \file
/// SI Implementation of TargetInstrInfo.
//
//===----------------------------------------------------------------------===//
 
#include "SIInstrInfo.h"
#include "AMDGPU.h"
#include "AMDGPUInstrInfo.h"
#include "GCNHazardRecognizer.h"
#include "GCNSubtarget.h"
#include "SIMachineFunctionInfo.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/CodeGen/LiveIntervals.h"
#include "llvm/CodeGen/LiveVariables.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineScheduler.h"
#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/CodeGen/ScheduleDAG.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/IntrinsicsAMDGPU.h"
#include "llvm/MC/MCContext.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Target/TargetMachine.h"
 
using namespace llvm;
 
#define DEBUG_TYPE "si-instr-info"
 
#define GET_INSTRINFO_CTOR_DTOR
#include "AMDGPUGenInstrInfo.inc"
 
namespace llvm {
 
class AAResults;
 
namespace AMDGPU {
#define GET_D16ImageDimIntrinsics_IMPL
#define GET_ImageDimIntrinsicTable_IMPL
#define GET_RsrcIntrinsics_IMPL
#include "AMDGPUGenSearchableTables.inc"
}
}
 
 
// Must be at least 4 to be able to branch over minimum unconditional branch
// code. This is only for making it possible to write reasonably small tests for
// long branches.
static cl::opt<unsigned>
BranchOffsetBits("amdgpu-s-branch-bits", cl::ReallyHidden, cl::init(16),
                 cl::desc("Restrict range of branch instructions (DEBUG)"));
 
static cl::opt<bool> Fix16BitCopies(
  "amdgpu-fix-16-bit-physreg-copies",
  cl::desc("Fix copies between 32 and 16 bit registers by extending to 32 bit"),
  cl::init(true),
  cl::ReallyHidden);
 
SIInstrInfo::SIInstrInfo(const GCNSubtarget &ST)
  : AMDGPUGenInstrInfo(AMDGPU::ADJCALLSTACKUP, AMDGPU::ADJCALLSTACKDOWN),
    RI(ST), ST(ST) {
  SchedModel.init(&ST);
}
 
//===----------------------------------------------------------------------===//
// TargetInstrInfo callbacks
//===----------------------------------------------------------------------===//
 
static unsigned getNumOperandsNoGlue(SDNode *Node) {
  unsigned N = Node->getNumOperands();
  while (N && Node->getOperand(N - 1).getValueType() == MVT::Glue)
    --N;
  return N;
}
 
/// Returns true if both nodes have the same value for the given
///        operand \p Op, or if both nodes do not have this operand.
static bool nodesHaveSameOperandValue(SDNode *N0, SDNode* N1, unsigned OpName) {
  unsigned Opc0 = N0->getMachineOpcode();
  unsigned Opc1 = N1->getMachineOpcode();
 
  int Op0Idx = AMDGPU::getNamedOperandIdx(Opc0, OpName);
  int Op1Idx = AMDGPU::getNamedOperandIdx(Opc1, OpName);
 
  if (Op0Idx == -1 && Op1Idx == -1)
    return true;
 
 
  if ((Op0Idx == -1 && Op1Idx != -1) ||
      (Op1Idx == -1 && Op0Idx != -1))
    return false;
 
  // getNamedOperandIdx returns the index for the MachineInstr's operands,
  // which includes the result as the first operand. We are indexing into the
  // MachineSDNode's operands, so we need to skip the result operand to get
  // the real index.
  --Op0Idx;
  --Op1Idx;
 
  return N0->getOperand(Op0Idx) == N1->getOperand(Op1Idx);
}
 
bool SIInstrInfo::isReallyTriviallyReMaterializable(
    const MachineInstr &MI) const {
  if (isVOP1(MI) || isVOP2(MI) || isVOP3(MI) || isSDWA(MI) || isSALU(MI)) {
    // Normally VALU use of exec would block the rematerialization, but that
    // is OK in this case to have an implicit exec read as all VALU do.
    // We really want all of the generic logic for this except for this.
 
    // Another potential implicit use is mode register. The core logic of
    // the RA will not attempt rematerialization if mode is set anywhere
    // in the function, otherwise it is safe since mode is not changed.
 
    // There is difference to generic method which does not allow
    // rematerialization if there are virtual register uses. We allow this,
    // therefore this method includes SOP instructions as well.
    return !MI.hasImplicitDef() &&
           MI.getNumImplicitOperands() == MI.getDesc().getNumImplicitUses() &&
           !MI.mayRaiseFPException();
  }
 
  return false;
}
 
// Returns true if the scalar result of a VALU instruction depends on exec.
static bool resultDependsOnExec(const MachineInstr &MI) {
  // Ignore comparisons which are only used masked with exec.
  // This allows some hoisting/sinking of VALU comparisons.
  if (MI.isCompare()) {
    const MachineRegisterInfo &MRI = MI.getParent()->getParent()->getRegInfo();
    Register DstReg = MI.getOperand(0).getReg();
    if (!DstReg.isVirtual())
      return true;
    for (MachineInstr &Use : MRI.use_nodbg_instructions(DstReg)) {
      switch (Use.getOpcode()) {
      case AMDGPU::S_AND_SAVEEXEC_B32:
      case AMDGPU::S_AND_SAVEEXEC_B64:
        break;
      case AMDGPU::S_AND_B32:
      case AMDGPU::S_AND_B64:
        if (!Use.readsRegister(AMDGPU::EXEC))
          return true;
        break;
      default:
        return true;
      }
    }
    return false;
  }
 
  switch (MI.getOpcode()) {
  default:
    break;
  case AMDGPU::V_READFIRSTLANE_B32:
    return true;
  }
 
  return false;
}
 
bool SIInstrInfo::isIgnorableUse(const MachineOperand &MO) const {
  // Any implicit use of exec by VALU is not a real register read.
  return MO.getReg() == AMDGPU::EXEC && MO.isImplicit() &&
         isVALU(*MO.getParent()) && !resultDependsOnExec(*MO.getParent());
}
 
bool SIInstrInfo::areLoadsFromSameBasePtr(SDNode *Load0, SDNode *Load1,
                                          int64_t &Offset0,
                                          int64_t &Offset1) const {
  if (!Load0->isMachineOpcode() || !Load1->isMachineOpcode())
    return false;
 
  unsigned Opc0 = Load0->getMachineOpcode();
  unsigned Opc1 = Load1->getMachineOpcode();
 
  // Make sure both are actually loads.
  if (!get(Opc0).mayLoad() || !get(Opc1).mayLoad())
    return false;
 
  if (isDS(Opc0) && isDS(Opc1)) {
 
    // FIXME: Handle this case:
    if (getNumOperandsNoGlue(Load0) != getNumOperandsNoGlue(Load1))
      return false;
 
    // Check base reg.
    if (Load0->getOperand(0) != Load1->getOperand(0))
      return false;
 
    // Skip read2 / write2 variants for simplicity.
    // TODO: We should report true if the used offsets are adjacent (excluded
    // st64 versions).
    int Offset0Idx = AMDGPU::getNamedOperandIdx(Opc0, AMDGPU::OpName::offset);
    int Offset1Idx = AMDGPU::getNamedOperandIdx(Opc1, AMDGPU::OpName::offset);
    if (Offset0Idx == -1 || Offset1Idx == -1)
      return false;
 
    // XXX - be careful of dataless loads
    // getNamedOperandIdx returns the index for MachineInstrs.  Since they
    // include the output in the operand list, but SDNodes don't, we need to
    // subtract the index by one.
    Offset0Idx -= get(Opc0).NumDefs;
    Offset1Idx -= get(Opc1).NumDefs;
    Offset0 = cast<ConstantSDNode>(Load0->getOperand(Offset0Idx))->getZExtValue();
    Offset1 = cast<ConstantSDNode>(Load1->getOperand(Offset1Idx))->getZExtValue();
    return true;
  }
 
  if (isSMRD(Opc0) && isSMRD(Opc1)) {
    // Skip time and cache invalidation instructions.
    if (AMDGPU::getNamedOperandIdx(Opc0, AMDGPU::OpName::sbase) == -1 ||
        AMDGPU::getNamedOperandIdx(Opc1, AMDGPU::OpName::sbase) == -1)
      return false;
 
    unsigned NumOps = getNumOperandsNoGlue(Load0);
    if (NumOps != getNumOperandsNoGlue(Load1))
      return false;
 
    // Check base reg.
    if (Load0->getOperand(0) != Load1->getOperand(0))
      return false;
 
    // Match register offsets, if both register and immediate offsets present.
    assert(NumOps == 4 || NumOps == 5);
    if (NumOps == 5 && Load0->getOperand(1) != Load1->getOperand(1))
      return false;
 
    const ConstantSDNode *Load0Offset =
        dyn_cast<ConstantSDNode>(Load0->getOperand(NumOps - 3));
    const ConstantSDNode *Load1Offset =
        dyn_cast<ConstantSDNode>(Load1->getOperand(NumOps - 3));
 
    if (!Load0Offset || !Load1Offset)
      return false;
 
    Offset0 = Load0Offset->getZExtValue();
    Offset1 = Load1Offset->getZExtValue();
    return true;
  }
 
  // MUBUF and MTBUF can access the same addresses.
  if ((isMUBUF(Opc0) || isMTBUF(Opc0)) && (isMUBUF(Opc1) || isMTBUF(Opc1))) {
 
    // MUBUF and MTBUF have vaddr at different indices.
    if (!nodesHaveSameOperandValue(Load0, Load1, AMDGPU::OpName::soffset) ||
        !nodesHaveSameOperandValue(Load0, Load1, AMDGPU::OpName::vaddr) ||
        !nodesHaveSameOperandValue(Load0, Load1, AMDGPU::OpName::srsrc))
      return false;
 
    int OffIdx0 = AMDGPU::getNamedOperandIdx(Opc0, AMDGPU::OpName::offset);
    int OffIdx1 = AMDGPU::getNamedOperandIdx(Opc1, AMDGPU::OpName::offset);
 
    if (OffIdx0 == -1 || OffIdx1 == -1)
      return false;
 
    // getNamedOperandIdx returns the index for MachineInstrs.  Since they
    // include the output in the operand list, but SDNodes don't, we need to
    // subtract the index by one.
    OffIdx0 -= get(Opc0).NumDefs;
    OffIdx1 -= get(Opc1).NumDefs;
 
    SDValue Off0 = Load0->getOperand(OffIdx0);
    SDValue Off1 = Load1->getOperand(OffIdx1);
 
    // The offset might be a FrameIndexSDNode.
    if (!isa<ConstantSDNode>(Off0) || !isa<ConstantSDNode>(Off1))
      return false;
 
    Offset0 = cast<ConstantSDNode>(Off0)->getZExtValue();
    Offset1 = cast<ConstantSDNode>(Off1)->getZExtValue();
    return true;
  }
 
  return false;
}
 
static bool isStride64(unsigned Opc) {
  switch (Opc) {
  case AMDGPU::DS_READ2ST64_B32:
  case AMDGPU::DS_READ2ST64_B64:
  case AMDGPU::DS_WRITE2ST64_B32:
  case AMDGPU::DS_WRITE2ST64_B64:
    return true;
  default:
    return false;
  }
}
 
bool SIInstrInfo::getMemOperandsWithOffsetWidth(
    const MachineInstr &LdSt, SmallVectorImpl<const MachineOperand *> &BaseOps,
    int64_t &Offset, bool &OffsetIsScalable, unsigned &Width,
    const TargetRegisterInfo *TRI) const {
  if (!LdSt.mayLoadOrStore())
    return false;
 
  unsigned Opc = LdSt.getOpcode();
  OffsetIsScalable = false;
  const MachineOperand *BaseOp, *OffsetOp;
  int DataOpIdx;
 
  if (isDS(LdSt)) {
    BaseOp = getNamedOperand(LdSt, AMDGPU::OpName::addr);
    OffsetOp = getNamedOperand(LdSt, AMDGPU::OpName::offset);
    if (OffsetOp) {
      // Normal, single offset LDS instruction.
      if (!BaseOp) {
        // DS_CONSUME/DS_APPEND use M0 for the base address.
        // TODO: find the implicit use operand for M0 and use that as BaseOp?
        return false;
      }
      BaseOps.push_back(BaseOp);
      Offset = OffsetOp->getImm();
      // Get appropriate operand, and compute width accordingly.
      DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdst);
      if (DataOpIdx == -1)
        DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::data0);
      Width = getOpSize(LdSt, DataOpIdx);
    } else {
      // The 2 offset instructions use offset0 and offset1 instead. We can treat
      // these as a load with a single offset if the 2 offsets are consecutive.
      // We will use this for some partially aligned loads.
      const MachineOperand *Offset0Op =
          getNamedOperand(LdSt, AMDGPU::OpName::offset0);
      const MachineOperand *Offset1Op =
          getNamedOperand(LdSt, AMDGPU::OpName::offset1);
 
      unsigned Offset0 = Offset0Op->getImm();
      unsigned Offset1 = Offset1Op->getImm();
      if (Offset0 + 1 != Offset1)
        return false;
 
      // Each of these offsets is in element sized units, so we need to convert
      // to bytes of the individual reads.
 
      unsigned EltSize;
      if (LdSt.mayLoad())
        EltSize = TRI->getRegSizeInBits(*getOpRegClass(LdSt, 0)) / 16;
      else {
        assert(LdSt.mayStore());
        int Data0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::data0);
        EltSize = TRI->getRegSizeInBits(*getOpRegClass(LdSt, Data0Idx)) / 8;
      }
 
      if (isStride64(Opc))
        EltSize *= 64;
 
      BaseOps.push_back(BaseOp);
      Offset = EltSize * Offset0;
      // Get appropriate operand(s), and compute width accordingly.
      DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdst);
      if (DataOpIdx == -1) {
        DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::data0);
        Width = getOpSize(LdSt, DataOpIdx);
        DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::data1);
        Width += getOpSize(LdSt, DataOpIdx);
      } else {
        Width = getOpSize(LdSt, DataOpIdx);
      }
    }
    return true;
  }
 
  if (isMUBUF(LdSt) || isMTBUF(LdSt)) {
    const MachineOperand *RSrc = getNamedOperand(LdSt, AMDGPU::OpName::srsrc);
    if (!RSrc) // e.g. BUFFER_WBINVL1_VOL
      return false;
    BaseOps.push_back(RSrc);
    BaseOp = getNamedOperand(LdSt, AMDGPU::OpName::vaddr);
    if (BaseOp && !BaseOp->isFI())
      BaseOps.push_back(BaseOp);
    const MachineOperand *OffsetImm =
        getNamedOperand(LdSt, AMDGPU::OpName::offset);
    Offset = OffsetImm->getImm();
    const MachineOperand *SOffset =
        getNamedOperand(LdSt, AMDGPU::OpName::soffset);
    if (SOffset) {
      if (SOffset->isReg())
        BaseOps.push_back(SOffset);
      else
        Offset += SOffset->getImm();
    }
    // Get appropriate operand, and compute width accordingly.
    DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdst);
    if (DataOpIdx == -1)
      DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdata);
    if (DataOpIdx == -1) // LDS DMA
      return false;
    Width = getOpSize(LdSt, DataOpIdx);
    return true;
  }
 
  if (isMIMG(LdSt)) {
    int SRsrcIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::srsrc);
    BaseOps.push_back(&LdSt.getOperand(SRsrcIdx));
    int VAddr0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vaddr0);
    if (VAddr0Idx >= 0) {
      // GFX10 possible NSA encoding.
      for (int I = VAddr0Idx; I < SRsrcIdx; ++I)
        BaseOps.push_back(&LdSt.getOperand(I));
    } else {
      BaseOps.push_back(getNamedOperand(LdSt, AMDGPU::OpName::vaddr));
    }
    Offset = 0;
    // Get appropriate operand, and compute width accordingly.
    DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdata);
    Width = getOpSize(LdSt, DataOpIdx);
    return true;
  }
 
  if (isSMRD(LdSt)) {
    BaseOp = getNamedOperand(LdSt, AMDGPU::OpName::sbase);
    if (!BaseOp) // e.g. S_MEMTIME
      return false;
    BaseOps.push_back(BaseOp);
    OffsetOp = getNamedOperand(LdSt, AMDGPU::OpName::offset);
    Offset = OffsetOp ? OffsetOp->getImm() : 0;
    // Get appropriate operand, and compute width accordingly.
    DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::sdst);
    Width = getOpSize(LdSt, DataOpIdx);
    return true;
  }
 
  if (isFLAT(LdSt)) {
    // Instructions have either vaddr or saddr or both or none.
    BaseOp = getNamedOperand(LdSt, AMDGPU::OpName::vaddr);
    if (BaseOp)
      BaseOps.push_back(BaseOp);
    BaseOp = getNamedOperand(LdSt, AMDGPU::OpName::saddr);
    if (BaseOp)
      BaseOps.push_back(BaseOp);
    Offset = getNamedOperand(LdSt, AMDGPU::OpName::offset)->getImm();
    // Get appropriate operand, and compute width accordingly.
    DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdst);
    if (DataOpIdx == -1)
      DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdata);
    if (DataOpIdx == -1) // LDS DMA
      return false;
    Width = getOpSize(LdSt, DataOpIdx);
    return true;
  }
 
  return false;
}
 
static bool memOpsHaveSameBasePtr(const MachineInstr &MI1,
                                  ArrayRef<const MachineOperand *> BaseOps1,
                                  const MachineInstr &MI2,
                                  ArrayRef<const MachineOperand *> BaseOps2) {
  // Only examine the first "base" operand of each instruction, on the
  // assumption that it represents the real base address of the memory access.
  // Other operands are typically offsets or indices from this base address.
  if (BaseOps1.front()->isIdenticalTo(*BaseOps2.front()))
    return true;
 
  if (!MI1.hasOneMemOperand() || !MI2.hasOneMemOperand())
    return false;
 
  auto MO1 = *MI1.memoperands_begin();
  auto MO2 = *MI2.memoperands_begin();
  if (MO1->getAddrSpace() != MO2->getAddrSpace())
    return false;
 
  auto Base1 = MO1->getValue();
  auto Base2 = MO2->getValue();
  if (!Base1 || !Base2)
    return false;
  Base1 = getUnderlyingObject(Base1);
  Base2 = getUnderlyingObject(Base2);
 
  if (isa<UndefValue>(Base1) || isa<UndefValue>(Base2))
    return false;
 
  return Base1 == Base2;
}
 
bool SIInstrInfo::shouldClusterMemOps(ArrayRef<const MachineOperand *> BaseOps1,
                                      ArrayRef<const MachineOperand *> BaseOps2,
                                      unsigned NumLoads,
                                      unsigned NumBytes) const {
  // If the mem ops (to be clustered) do not have the same base ptr, then they
  // should not be clustered
  if (!BaseOps1.empty() && !BaseOps2.empty()) {
    const MachineInstr &FirstLdSt = *BaseOps1.front()->getParent();
    const MachineInstr &SecondLdSt = *BaseOps2.front()->getParent();
    if (!memOpsHaveSameBasePtr(FirstLdSt, BaseOps1, SecondLdSt, BaseOps2))
      return false;
  } else if (!BaseOps1.empty() || !BaseOps2.empty()) {
    // If only one base op is empty, they do not have the same base ptr
    return false;
  }
 
  // In order to avoid register pressure, on an average, the number of DWORDS
  // loaded together by all clustered mem ops should not exceed 8. This is an
  // empirical value based on certain observations and performance related
  // experiments.
  // The good thing about this heuristic is - it avoids clustering of too many
  // sub-word loads, and also avoids clustering of wide loads. Below is the
  // brief summary of how the heuristic behaves for various `LoadSize`.
  // (1) 1 <= LoadSize <= 4: cluster at max 8 mem ops
  // (2) 5 <= LoadSize <= 8: cluster at max 4 mem ops
  // (3) 9 <= LoadSize <= 12: cluster at max 2 mem ops
  // (4) 13 <= LoadSize <= 16: cluster at max 2 mem ops
  // (5) LoadSize >= 17: do not cluster
  const unsigned LoadSize = NumBytes / NumLoads;
  const unsigned NumDWORDs = ((LoadSize + 3) / 4) * NumLoads;
  return NumDWORDs <= 8;
}
 
// FIXME: This behaves strangely. If, for example, you have 32 load + stores,
// the first 16 loads will be interleaved with the stores, and the next 16 will
// be clustered as expected. It should really split into 2 16 store batches.
//
// Loads are clustered until this returns false, rather than trying to schedule
// groups of stores. This also means we have to deal with saying different
// address space loads should be clustered, and ones which might cause bank
// conflicts.
//
// This might be deprecated so it might not be worth that much effort to fix.
bool SIInstrInfo::shouldScheduleLoadsNear(SDNode *Load0, SDNode *Load1,
                                          int64_t Offset0, int64_t Offset1,
                                          unsigned NumLoads) const {
  assert(Offset1 > Offset0 &&
         "Second offset should be larger than first offset!");
  // If we have less than 16 loads in a row, and the offsets are within 64
  // bytes, then schedule together.
 
  // A cacheline is 64 bytes (for global memory).
  return (NumLoads <= 16 && (Offset1 - Offset0) < 64);
}
 
static void reportIllegalCopy(const SIInstrInfo *TII, MachineBasicBlock &MBB,
                              MachineBasicBlock::iterator MI,
                              const DebugLoc &DL, MCRegister DestReg,
                              MCRegister SrcReg, bool KillSrc,
                              const char *Msg = "illegal SGPR to VGPR copy") {
  MachineFunction *MF = MBB.getParent();
  DiagnosticInfoUnsupported IllegalCopy(MF->getFunction(), Msg, DL, DS_Error);
  LLVMContext &C = MF->getFunction().getContext();
  C.diagnose(IllegalCopy);
 
  BuildMI(MBB, MI, DL, TII->get(AMDGPU::SI_ILLEGAL_COPY), DestReg)
    .addReg(SrcReg, getKillRegState(KillSrc));
}
 
/// Handle copying from SGPR to AGPR, or from AGPR to AGPR on GFX908. It is not
/// possible to have a direct copy in these cases on GFX908, so an intermediate
/// VGPR copy is required.
static void indirectCopyToAGPR(const SIInstrInfo &TII,
                               MachineBasicBlock &MBB,
                               MachineBasicBlock::iterator MI,
                               const DebugLoc &DL, MCRegister DestReg,
                               MCRegister SrcReg, bool KillSrc,
                               RegScavenger &RS,
                               Register ImpDefSuperReg = Register(),
                               Register ImpUseSuperReg = Register()) {
  assert((TII.getSubtarget().hasMAIInsts() &&
          !TII.getSubtarget().hasGFX90AInsts()) &&
         "Expected GFX908 subtarget.");
 
  assert((AMDGPU::SReg_32RegClass.contains(SrcReg) ||
          AMDGPU::AGPR_32RegClass.contains(SrcReg)) &&
         "Source register of the copy should be either an SGPR or an AGPR.");
 
  assert(AMDGPU::AGPR_32RegClass.contains(DestReg) &&
         "Destination register of the copy should be an AGPR.");
 
  const SIRegisterInfo &RI = TII.getRegisterInfo();
 
  // First try to find defining accvgpr_write to avoid temporary registers.
  for (auto Def = MI, E = MBB.begin(); Def != E; ) {
    --Def;
    if (!Def->definesRegister(SrcReg, &RI))
      continue;
    if (Def->getOpcode() != AMDGPU::V_ACCVGPR_WRITE_B32_e64)
      break;
 
    MachineOperand &DefOp = Def->getOperand(1);
    assert(DefOp.isReg() || DefOp.isImm());
 
    if (DefOp.isReg()) {
      // Check that register source operand if not clobbered before MI.
      // Immediate operands are always safe to propagate.
      bool SafeToPropagate = true;
      for (auto I = Def; I != MI && SafeToPropagate; ++I)
        if (I->modifiesRegister(DefOp.getReg(), &RI))
          SafeToPropagate = false;
 
      if (!SafeToPropagate)
        break;
 
      DefOp.setIsKill(false);
    }
 
    MachineInstrBuilder Builder =
      BuildMI(MBB, MI, DL, TII.get(AMDGPU::V_ACCVGPR_WRITE_B32_e64), DestReg)
      .add(DefOp);
    if (ImpDefSuperReg)
      Builder.addReg(ImpDefSuperReg, RegState::Define | RegState::Implicit);
 
    if (ImpUseSuperReg) {
      Builder.addReg(ImpUseSuperReg,
                     getKillRegState(KillSrc) | RegState::Implicit);
    }
 
    return;
  }
 
  RS.enterBasicBlock(MBB);
  RS.forward(MI);
 
  // Ideally we want to have three registers for a long reg_sequence copy
  // to hide 2 waitstates between v_mov_b32 and accvgpr_write.
  unsigned MaxVGPRs = RI.getRegPressureLimit(&AMDGPU::VGPR_32RegClass,
                                             *MBB.getParent());
 
  // Registers in the sequence are allocated contiguously so we can just
  // use register number to pick one of three round-robin temps.
  unsigned RegNo = (DestReg - AMDGPU::AGPR0) % 3;
  Register Tmp =
      MBB.getParent()->getInfo<SIMachineFunctionInfo>()->getVGPRForAGPRCopy();
  assert(MBB.getParent()->getRegInfo().isReserved(Tmp) &&
         "VGPR used for an intermediate copy should have been reserved.");
 
  // Only loop through if there are any free registers left, otherwise
  // scavenger may report a fatal error without emergency spill slot
  // or spill with the slot.
  while (RegNo-- && RS.FindUnusedReg(&AMDGPU::VGPR_32RegClass)) {
    Register Tmp2 = RS.scavengeRegister(&AMDGPU::VGPR_32RegClass, 0);
    if (!Tmp2 || RI.getHWRegIndex(Tmp2) >= MaxVGPRs)
      break;
    Tmp = Tmp2;
    RS.setRegUsed(Tmp);
  }
 
  // Insert copy to temporary VGPR.
  unsigned TmpCopyOp = AMDGPU::V_MOV_B32_e32;
  if (AMDGPU::AGPR_32RegClass.contains(SrcReg)) {
    TmpCopyOp = AMDGPU::V_ACCVGPR_READ_B32_e64;
  } else {
    assert(AMDGPU::SReg_32RegClass.contains(SrcReg));
  }
 
  MachineInstrBuilder UseBuilder = BuildMI(MBB, MI, DL, TII.get(TmpCopyOp), Tmp)
    .addReg(SrcReg, getKillRegState(KillSrc));
  if (ImpUseSuperReg) {
    UseBuilder.addReg(ImpUseSuperReg,
                      getKillRegState(KillSrc) | RegState::Implicit);
  }
 
  MachineInstrBuilder DefBuilder
    = BuildMI(MBB, MI, DL, TII.get(AMDGPU::V_ACCVGPR_WRITE_B32_e64), DestReg)
    .addReg(Tmp, RegState::Kill);
 
  if (ImpDefSuperReg)
    DefBuilder.addReg(ImpDefSuperReg, RegState::Define | RegState::Implicit);
}
 
static void expandSGPRCopy(const SIInstrInfo &TII, MachineBasicBlock &MBB,
                           MachineBasicBlock::iterator MI, const DebugLoc &DL,
                           MCRegister DestReg, MCRegister SrcReg, bool KillSrc,
                           const TargetRegisterClass *RC, bool Forward) {
  const SIRegisterInfo &RI = TII.getRegisterInfo();
  ArrayRef<int16_t> BaseIndices = RI.getRegSplitParts(RC, 4);
  MachineBasicBlock::iterator I = MI;
  MachineInstr *FirstMI = nullptr, *LastMI = nullptr;
 
  for (unsigned Idx = 0; Idx < BaseIndices.size(); ++Idx) {
    int16_t SubIdx = BaseIndices[Idx];
    Register Reg = RI.getSubReg(DestReg, SubIdx);
    unsigned Opcode = AMDGPU::S_MOV_B32;
 
    // Is SGPR aligned? If so try to combine with next.
    Register Src = RI.getSubReg(SrcReg, SubIdx);
    bool AlignedDest = ((Reg - AMDGPU::SGPR0) % 2) == 0;
    bool AlignedSrc = ((Src - AMDGPU::SGPR0) % 2) == 0;
    if (AlignedDest && AlignedSrc && (Idx + 1 < BaseIndices.size())) {
      // Can use SGPR64 copy
      unsigned Channel = RI.getChannelFromSubReg(SubIdx);
      SubIdx = RI.getSubRegFromChannel(Channel, 2);
      Opcode = AMDGPU::S_MOV_B64;
      Idx++;
    }
 
    LastMI = BuildMI(MBB, I, DL, TII.get(Opcode), RI.getSubReg(DestReg, SubIdx))
                 .addReg(RI.getSubReg(SrcReg, SubIdx))
                 .addReg(SrcReg, RegState::Implicit);
 
    if (!FirstMI)
      FirstMI = LastMI;
 
    if (!Forward)
      I--;
  }
 
  assert(FirstMI && LastMI);
  if (!Forward)
    std::swap(FirstMI, LastMI);
 
  FirstMI->addOperand(
      MachineOperand::CreateReg(DestReg, true /*IsDef*/, true /*IsImp*/));
 
  if (KillSrc)
    LastMI->addRegisterKilled(SrcReg, &RI);
}
 
void SIInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
                              MachineBasicBlock::iterator MI,
                              const DebugLoc &DL, MCRegister DestReg,
                              MCRegister SrcReg, bool KillSrc) const {
  const TargetRegisterClass *RC = RI.getPhysRegClass(DestReg);
 
  // FIXME: This is hack to resolve copies between 16 bit and 32 bit
  // registers until all patterns are fixed.
  if (Fix16BitCopies &&
      ((RI.getRegSizeInBits(*RC) == 16) ^
       (RI.getRegSizeInBits(*RI.getPhysRegClass(SrcReg)) == 16))) {
    MCRegister &RegToFix = (RI.getRegSizeInBits(*RC) == 16) ? DestReg : SrcReg;
    MCRegister Super = RI.get32BitRegister(RegToFix);
    assert(RI.getSubReg(Super, AMDGPU::lo16) == RegToFix);
    RegToFix = Super;
 
    if (DestReg == SrcReg) {
      // Insert empty bundle since ExpandPostRA expects an instruction here.
      BuildMI(MBB, MI, DL, get(AMDGPU::BUNDLE));
      return;
    }
 
    RC = RI.getPhysRegClass(DestReg);
  }
 
  if (RC == &AMDGPU::VGPR_32RegClass) {
    assert(AMDGPU::VGPR_32RegClass.contains(SrcReg) ||
           AMDGPU::SReg_32RegClass.contains(SrcReg) ||
           AMDGPU::AGPR_32RegClass.contains(SrcReg));
    unsigned Opc = AMDGPU::AGPR_32RegClass.contains(SrcReg) ?
                     AMDGPU::V_ACCVGPR_READ_B32_e64 : AMDGPU::V_MOV_B32_e32;
    BuildMI(MBB, MI, DL, get(Opc), DestReg)
      .addReg(SrcReg, getKillRegState(KillSrc));
    return;
  }
 
  if (RC == &AMDGPU::SReg_32_XM0RegClass ||
      RC == &AMDGPU::SReg_32RegClass) {
    if (SrcReg == AMDGPU::SCC) {
      BuildMI(MBB, MI, DL, get(AMDGPU::S_CSELECT_B32), DestReg)
          .addImm(1)
          .addImm(0);
      return;
    }
 
    if (DestReg == AMDGPU::VCC_LO) {
      if (AMDGPU::SReg_32RegClass.contains(SrcReg)) {
        BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), AMDGPU::VCC_LO)
          .addReg(SrcReg, getKillRegState(KillSrc));
      } else {
        // FIXME: Hack until VReg_1 removed.
        assert(AMDGPU::VGPR_32RegClass.contains(SrcReg));
        BuildMI(MBB, MI, DL, get(AMDGPU::V_CMP_NE_U32_e32))
          .addImm(0)
          .addReg(SrcReg, getKillRegState(KillSrc));
      }
 
      return;
    }
 
    if (!AMDGPU::SReg_32RegClass.contains(SrcReg)) {
      reportIllegalCopy(this, MBB, MI, DL, DestReg, SrcReg, KillSrc);
      return;
    }
 
    BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), DestReg)
            .addReg(SrcReg, getKillRegState(KillSrc));
    return;
  }
 
  if (RC == &AMDGPU::SReg_64RegClass) {
    if (SrcReg == AMDGPU::SCC) {
      BuildMI(MBB, MI, DL, get(AMDGPU::S_CSELECT_B64), DestReg)
          .addImm(1)
          .addImm(0);
      return;
    }
 
    if (DestReg == AMDGPU::VCC) {
      if (AMDGPU::SReg_64RegClass.contains(SrcReg)) {
        BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B64), AMDGPU::VCC)
          .addReg(SrcReg, getKillRegState(KillSrc));
      } else {
        // FIXME: Hack until VReg_1 removed.
        assert(AMDGPU::VGPR_32RegClass.contains(SrcReg));
        BuildMI(MBB, MI, DL, get(AMDGPU::V_CMP_NE_U32_e32))
          .addImm(0)
          .addReg(SrcReg, getKillRegState(KillSrc));
      }
 
      return;
    }
 
    if (!AMDGPU::SReg_64RegClass.contains(SrcReg)) {
      reportIllegalCopy(this, MBB, MI, DL, DestReg, SrcReg, KillSrc);
      return;
    }
 
    BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B64), DestReg)
            .addReg(SrcReg, getKillRegState(KillSrc));
    return;
  }
 
  if (DestReg == AMDGPU::SCC) {
    // Copying 64-bit or 32-bit sources to SCC barely makes sense,
    // but SelectionDAG emits such copies for i1 sources.
    if (AMDGPU::SReg_64RegClass.contains(SrcReg)) {
      // This copy can only be produced by patterns
      // with explicit SCC, which are known to be enabled
      // only for subtargets with S_CMP_LG_U64 present.
      assert(ST.hasScalarCompareEq64());
      BuildMI(MBB, MI, DL, get(AMDGPU::S_CMP_LG_U64))
          .addReg(SrcReg, getKillRegState(KillSrc))
          .addImm(0);
    } else {
      assert(AMDGPU::SReg_32RegClass.contains(SrcReg));
      BuildMI(MBB, MI, DL, get(AMDGPU::S_CMP_LG_U32))
          .addReg(SrcReg, getKillRegState(KillSrc))
          .addImm(0);
    }
 
    return;
  }
 
  if (RC == &AMDGPU::AGPR_32RegClass) {
    if (AMDGPU::VGPR_32RegClass.contains(SrcReg) ||
        (ST.hasGFX90AInsts() && AMDGPU::SReg_32RegClass.contains(SrcReg))) {
      BuildMI(MBB, MI, DL, get(AMDGPU::V_ACCVGPR_WRITE_B32_e64), DestReg)
        .addReg(SrcReg, getKillRegState(KillSrc));
      return;
    }
 
    if (AMDGPU::AGPR_32RegClass.contains(SrcReg) && ST.hasGFX90AInsts()) {
      BuildMI(MBB, MI, DL, get(AMDGPU::V_ACCVGPR_MOV_B32), DestReg)
        .addReg(SrcReg, getKillRegState(KillSrc));
      return;
    }
 
    // FIXME: Pass should maintain scavenger to avoid scan through the block on
    // every AGPR spill.
    RegScavenger RS;
    indirectCopyToAGPR(*this, MBB, MI, DL, DestReg, SrcReg, KillSrc, RS);
    return;
  }
 
  const unsigned Size = RI.getRegSizeInBits(*RC);
  if (Size == 16) {
    assert(AMDGPU::VGPR_LO16RegClass.contains(SrcReg) ||
           AMDGPU::VGPR_HI16RegClass.contains(SrcReg) ||
           AMDGPU::SReg_LO16RegClass.contains(SrcReg) ||
           AMDGPU::AGPR_LO16RegClass.contains(SrcReg));
 
    bool IsSGPRDst = AMDGPU::SReg_LO16RegClass.contains(DestReg);
    bool IsSGPRSrc = AMDGPU::SReg_LO16RegClass.contains(SrcReg);
    bool IsAGPRDst = AMDGPU::AGPR_LO16RegClass.contains(DestReg);
    bool IsAGPRSrc = AMDGPU::AGPR_LO16RegClass.contains(SrcReg);
    bool DstLow = AMDGPU::VGPR_LO16RegClass.contains(DestReg) ||
                  AMDGPU::SReg_LO16RegClass.contains(DestReg) ||
                  AMDGPU::AGPR_LO16RegClass.contains(DestReg);
    bool SrcLow = AMDGPU::VGPR_LO16RegClass.contains(SrcReg) ||
                  AMDGPU::SReg_LO16RegClass.contains(SrcReg) ||
                  AMDGPU::AGPR_LO16RegClass.contains(SrcReg);
    MCRegister NewDestReg = RI.get32BitRegister(DestReg);
    MCRegister NewSrcReg = RI.get32BitRegister(SrcReg);
 
    if (IsSGPRDst) {
      if (!IsSGPRSrc) {
        reportIllegalCopy(this, MBB, MI, DL, DestReg, SrcReg, KillSrc);
        return;
      }
 
      BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), NewDestReg)
        .addReg(NewSrcReg, getKillRegState(KillSrc));
      return;
    }
 
    if (IsAGPRDst || IsAGPRSrc) {
      if (!DstLow || !SrcLow) {
        reportIllegalCopy(this, MBB, MI, DL, DestReg, SrcReg, KillSrc,
                          "Cannot use hi16 subreg with an AGPR!");
      }
 
      copyPhysReg(MBB, MI, DL, NewDestReg, NewSrcReg, KillSrc);
      return;
    }
 
    if (IsSGPRSrc && !ST.hasSDWAScalar()) {
      if (!DstLow || !SrcLow) {
        reportIllegalCopy(this, MBB, MI, DL, DestReg, SrcReg, KillSrc,
                          "Cannot use hi16 subreg on VI!");
      }
 
      BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), NewDestReg)
        .addReg(NewSrcReg, getKillRegState(KillSrc));
      return;
    }
 
    auto MIB = BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_sdwa), NewDestReg)
      .addImm(0) // src0_modifiers
      .addReg(NewSrcReg)
      .addImm(0) // clamp
      .addImm(DstLow ? AMDGPU::SDWA::SdwaSel::WORD_0
                     : AMDGPU::SDWA::SdwaSel::WORD_1)
      .addImm(AMDGPU::SDWA::DstUnused::UNUSED_PRESERVE)
      .addImm(SrcLow ? AMDGPU::SDWA::SdwaSel::WORD_0
                     : AMDGPU::SDWA::SdwaSel::WORD_1)
      .addReg(NewDestReg, RegState::Implicit | RegState::Undef);
    // First implicit operand is $exec.
    MIB->tieOperands(0, MIB->getNumOperands() - 1);
    return;
  }
 
  const TargetRegisterClass *SrcRC = RI.getPhysRegClass(SrcReg);
  if (RC == RI.getVGPR64Class() && (SrcRC == RC || RI.isSGPRClass(SrcRC))) {
    if (ST.hasMovB64()) {
      BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B64_e32), DestReg)
        .addReg(SrcReg, getKillRegState(KillSrc));
      return;
    }
    if (ST.hasPackedFP32Ops()) {
      BuildMI(MBB, MI, DL, get(AMDGPU::V_PK_MOV_B32), DestReg)
        .addImm(SISrcMods::OP_SEL_1)
        .addReg(SrcReg)
        .addImm(SISrcMods::OP_SEL_0 | SISrcMods::OP_SEL_1)
        .addReg(SrcReg)
        .addImm(0) // op_sel_lo
        .addImm(0) // op_sel_hi
        .addImm(0) // neg_lo
        .addImm(0) // neg_hi
        .addImm(0) // clamp
        .addReg(SrcReg, getKillRegState(KillSrc) | RegState::Implicit);
      return;
    }
  }
 
  const bool Forward = RI.getHWRegIndex(DestReg) <= RI.getHWRegIndex(SrcReg);
  if (RI.isSGPRClass(RC)) {
    if (!RI.isSGPRClass(SrcRC)) {
      reportIllegalCopy(this, MBB, MI, DL, DestReg, SrcReg, KillSrc);
      return;
    }
    const bool CanKillSuperReg = KillSrc && !RI.regsOverlap(SrcReg, DestReg);
    expandSGPRCopy(*this, MBB, MI, DL, DestReg, SrcReg, CanKillSuperReg, RC,
                   Forward);
    return;
  }
 
  unsigned EltSize = 4;
  unsigned Opcode = AMDGPU::V_MOV_B32_e32;
  if (RI.isAGPRClass(RC)) {
    if (ST.hasGFX90AInsts() && RI.isAGPRClass(SrcRC))
      Opcode = AMDGPU::V_ACCVGPR_MOV_B32;
    else if (RI.hasVGPRs(SrcRC) ||
             (ST.hasGFX90AInsts() && RI.isSGPRClass(SrcRC)))
      Opcode = AMDGPU::V_ACCVGPR_WRITE_B32_e64;
    else
      Opcode = AMDGPU::INSTRUCTION_LIST_END;
  } else if (RI.hasVGPRs(RC) && RI.isAGPRClass(SrcRC)) {
    Opcode = AMDGPU::V_ACCVGPR_READ_B32_e64;
  } else if ((Size % 64 == 0) && RI.hasVGPRs(RC) &&
             (RI.isProperlyAlignedRC(*RC) &&
              (SrcRC == RC || RI.isSGPRClass(SrcRC)))) {
    // TODO: In 96-bit case, could do a 64-bit mov and then a 32-bit mov.
    if (ST.hasMovB64()) {
      Opcode = AMDGPU::V_MOV_B64_e32;
      EltSize = 8;
    } else if (ST.hasPackedFP32Ops()) {
      Opcode = AMDGPU::V_PK_MOV_B32;
      EltSize = 8;
    }
  }
 
  // For the cases where we need an intermediate instruction/temporary register
  // (destination is an AGPR), we need a scavenger.
  //
  // FIXME: The pass should maintain this for us so we don't have to re-scan the
  // whole block for every handled copy.
  std::unique_ptr<RegScavenger> RS;
  if (Opcode == AMDGPU::INSTRUCTION_LIST_END)
    RS.reset(new RegScavenger());
 
  ArrayRef<int16_t> SubIndices = RI.getRegSplitParts(RC, EltSize);
 
  // If there is an overlap, we can't kill the super-register on the last
  // instruction, since it will also kill the components made live by this def.
  const bool CanKillSuperReg = KillSrc && !RI.regsOverlap(SrcReg, DestReg);
 
  for (unsigned Idx = 0; Idx < SubIndices.size(); ++Idx) {
    unsigned SubIdx;
    if (Forward)
      SubIdx = SubIndices[Idx];
    else
      SubIdx = SubIndices[SubIndices.size() - Idx - 1];
 
    bool UseKill = CanKillSuperReg && Idx == SubIndices.size() - 1;
 
    if (Opcode == AMDGPU::INSTRUCTION_LIST_END) {
      Register ImpDefSuper = Idx == 0 ? Register(DestReg) : Register();
      Register ImpUseSuper = SrcReg;
      indirectCopyToAGPR(*this, MBB, MI, DL, RI.getSubReg(DestReg, SubIdx),
                         RI.getSubReg(SrcReg, SubIdx), UseKill, *RS,
                         ImpDefSuper, ImpUseSuper);
    } else if (Opcode == AMDGPU::V_PK_MOV_B32) {
      Register DstSubReg = RI.getSubReg(DestReg, SubIdx);
      Register SrcSubReg = RI.getSubReg(SrcReg, SubIdx);
      MachineInstrBuilder MIB =
        BuildMI(MBB, MI, DL, get(AMDGPU::V_PK_MOV_B32), DstSubReg)
        .addImm(SISrcMods::OP_SEL_1)
        .addReg(SrcSubReg)
        .addImm(SISrcMods::OP_SEL_0 | SISrcMods::OP_SEL_1)
        .addReg(SrcSubReg)
        .addImm(0) // op_sel_lo
        .addImm(0) // op_sel_hi
        .addImm(0) // neg_lo
        .addImm(0) // neg_hi
        .addImm(0) // clamp
        .addReg(SrcReg, getKillRegState(UseKill) | RegState::Implicit);
      if (Idx == 0)
        MIB.addReg(DestReg, RegState::Define | RegState::Implicit);
    } else {
      MachineInstrBuilder Builder =
        BuildMI(MBB, MI, DL, get(Opcode), RI.getSubReg(DestReg, SubIdx))
        .addReg(RI.getSubReg(SrcReg, SubIdx));
      if (Idx == 0)
        Builder.addReg(DestReg, RegState::Define | RegState::Implicit);
 
      Builder.addReg(SrcReg, getKillRegState(UseKill) | RegState::Implicit);
    }
  }
}
 
int SIInstrInfo::commuteOpcode(unsigned Opcode) const {
  int NewOpc;
 
  // Try to map original to commuted opcode
  NewOpc = AMDGPU::getCommuteRev(Opcode);
  if (NewOpc != -1)
    // Check if the commuted (REV) opcode exists on the target.
    return pseudoToMCOpcode(NewOpc) != -1 ? NewOpc : -1;
 
  // Try to map commuted to original opcode
  NewOpc = AMDGPU::getCommuteOrig(Opcode);
  if (NewOpc != -1)
    // Check if the original (non-REV) opcode exists on the target.
    return pseudoToMCOpcode(NewOpc) != -1 ? NewOpc : -1;
 
  return Opcode;
}
 
void SIInstrInfo::materializeImmediate(MachineBasicBlock &MBB,
                                       MachineBasicBlock::iterator MI,
                                       const DebugLoc &DL, unsigned DestReg,
                                       int64_t Value) const {
  MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
  const TargetRegisterClass *RegClass = MRI.getRegClass(DestReg);
  if (RegClass == &AMDGPU::SReg_32RegClass ||
      RegClass == &AMDGPU::SGPR_32RegClass ||
      RegClass == &AMDGPU::SReg_32_XM0RegClass ||
      RegClass == &AMDGPU::SReg_32_XM0_XEXECRegClass) {
    BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), DestReg)
      .addImm(Value);
    return;
  }
 
  if (RegClass == &AMDGPU::SReg_64RegClass ||
      RegClass == &AMDGPU::SGPR_64RegClass ||
      RegClass == &AMDGPU::SReg_64_XEXECRegClass) {
    BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B64), DestReg)
      .addImm(Value);
    return;
  }
 
  if (RegClass == &AMDGPU::VGPR_32RegClass) {
    BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DestReg)
      .addImm(Value);
    return;
  }
  if (RegClass->hasSuperClassEq(&AMDGPU::VReg_64RegClass)) {
    BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B64_PSEUDO), DestReg)
      .addImm(Value);
    return;
  }
 
  unsigned EltSize = 4;
  unsigned Opcode = AMDGPU::V_MOV_B32_e32;
  if (RI.isSGPRClass(RegClass)) {
    if (RI.getRegSizeInBits(*RegClass) > 32) {
      Opcode =  AMDGPU::S_MOV_B64;
      EltSize = 8;
    } else {
      Opcode = AMDGPU::S_MOV_B32;
      EltSize = 4;
    }
  }
 
  ArrayRef<int16_t> SubIndices = RI.getRegSplitParts(RegClass, EltSize);
  for (unsigned Idx = 0; Idx < SubIndices.size(); ++Idx) {
    int64_t IdxValue = Idx == 0 ? Value : 0;
 
    MachineInstrBuilder Builder = BuildMI(MBB, MI, DL,
      get(Opcode), RI.getSubReg(DestReg, SubIndices[Idx]));
    Builder.addImm(IdxValue);
  }
}
 
const TargetRegisterClass *
SIInstrInfo::getPreferredSelectRegClass(unsigned Size) const {
  return &AMDGPU::VGPR_32RegClass;
}
 
void SIInstrInfo::insertVectorSelect(MachineBasicBlock &MBB,
                                     MachineBasicBlock::iterator I,
                                     const DebugLoc &DL, Register DstReg,
                                     ArrayRef<MachineOperand> Cond,
                                     Register TrueReg,
                                     Register FalseReg) const {
  MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
  const TargetRegisterClass *BoolXExecRC =
    RI.getRegClass(AMDGPU::SReg_1_XEXECRegClassID);
  assert(MRI.getRegClass(DstReg) == &AMDGPU::VGPR_32RegClass &&
         "Not a VGPR32 reg");
 
  if (Cond.size() == 1) {
    Register SReg = MRI.createVirtualRegister(BoolXExecRC);
    BuildMI(MBB, I, DL, get(AMDGPU::COPY), SReg)
      .add(Cond[0]);
    BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstReg)
      .addImm(0)
      .addReg(FalseReg)
      .addImm(0)
      .addReg(TrueReg)
      .addReg(SReg);
  } else if (Cond.size() == 2) {
    assert(Cond[0].isImm() && "Cond[0] is not an immediate");
    switch (Cond[0].getImm()) {
    case SIInstrInfo::SCC_TRUE: {
      Register SReg = MRI.createVirtualRegister(BoolXExecRC);
      BuildMI(MBB, I, DL, get(ST.isWave32() ? AMDGPU::S_CSELECT_B32
                                            : AMDGPU::S_CSELECT_B64), SReg)
        .addImm(1)
        .addImm(0);
      BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstReg)
        .addImm(0)
        .addReg(FalseReg)
        .addImm(0)
        .addReg(TrueReg)
        .addReg(SReg);
      break;
    }
    case SIInstrInfo::SCC_FALSE: {
      Register SReg = MRI.createVirtualRegister(BoolXExecRC);
      BuildMI(MBB, I, DL, get(ST.isWave32() ? AMDGPU::S_CSELECT_B32
                                            : AMDGPU::S_CSELECT_B64), SReg)
        .addImm(0)
        .addImm(1);
      BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstReg)
        .addImm(0)
        .addReg(FalseReg)
        .addImm(0)
        .addReg(TrueReg)
        .addReg(SReg);
      break;
    }
    case SIInstrInfo::VCCNZ: {
      MachineOperand RegOp = Cond[1];
      RegOp.setImplicit(false);
      Register SReg = MRI.createVirtualRegister(BoolXExecRC);
      BuildMI(MBB, I, DL, get(AMDGPU::COPY), SReg)
        .add(RegOp);
      BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstReg)
          .addImm(0)
          .addReg(FalseReg)
          .addImm(0)
          .addReg(TrueReg)
          .addReg(SReg);
      break;
    }
    case SIInstrInfo::VCCZ: {
      MachineOperand RegOp = Cond[1];
      RegOp.setImplicit(false);
      Register SReg = MRI.createVirtualRegister(BoolXExecRC);
      BuildMI(MBB, I, DL, get(AMDGPU::COPY), SReg)
        .add(RegOp);
      BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstReg)
          .addImm(0)
          .addReg(TrueReg)
          .addImm(0)
          .addReg(FalseReg)
          .addReg(SReg);
      break;
    }
    case SIInstrInfo::EXECNZ: {
      Register SReg = MRI.createVirtualRegister(BoolXExecRC);
      Register SReg2 = MRI.createVirtualRegister(RI.getBoolRC());
      BuildMI(MBB, I, DL, get(ST.isWave32() ? AMDGPU::S_OR_SAVEEXEC_B32
                                            : AMDGPU::S_OR_SAVEEXEC_B64), SReg2)
        .addImm(0);
      BuildMI(MBB, I, DL, get(ST.isWave32() ? AMDGPU::S_CSELECT_B32
                                            : AMDGPU::S_CSELECT_B64), SReg)
        .addImm(1)
        .addImm(0);
      BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstReg)
        .addImm(0)
        .addReg(FalseReg)
        .addImm(0)
        .addReg(TrueReg)
        .addReg(SReg);
      break;
    }
    case SIInstrInfo::EXECZ: {
      Register SReg = MRI.createVirtualRegister(BoolXExecRC);
      Register SReg2 = MRI.createVirtualRegister(RI.getBoolRC());
      BuildMI(MBB, I, DL, get(ST.isWave32() ? AMDGPU::S_OR_SAVEEXEC_B32
                                            : AMDGPU::S_OR_SAVEEXEC_B64), SReg2)
        .addImm(0);
      BuildMI(MBB, I, DL, get(ST.isWave32() ? AMDGPU::S_CSELECT_B32
                                            : AMDGPU::S_CSELECT_B64), SReg)
        .addImm(0)
        .addImm(1);
      BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstReg)
        .addImm(0)
        .addReg(FalseReg)
        .addImm(0)
        .addReg(TrueReg)
        .addReg(SReg);
      llvm_unreachable("Unhandled branch predicate EXECZ");
      break;
    }
    default:
      llvm_unreachable("invalid branch predicate");
    }
  } else {
    llvm_unreachable("Can only handle Cond size 1 or 2");
  }
}
 
Register SIInstrInfo::insertEQ(MachineBasicBlock *MBB,
                               MachineBasicBlock::iterator I,
                               const DebugLoc &DL,
                               Register SrcReg, int Value) const {
  MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo();
  Register Reg = MRI.createVirtualRegister(RI.getBoolRC());
  BuildMI(*MBB, I, DL, get(AMDGPU::V_CMP_EQ_I32_e64), Reg)
    .addImm(Value)
    .addReg(SrcReg);
 
  return Reg;
}
 
Register SIInstrInfo::insertNE(MachineBasicBlock *MBB,
                               MachineBasicBlock::iterator I,
                               const DebugLoc &DL,
                               Register SrcReg, int Value) const {
  MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo();
  Register Reg = MRI.createVirtualRegister(RI.getBoolRC());
  BuildMI(*MBB, I, DL, get(AMDGPU::V_CMP_NE_I32_e64), Reg)
    .addImm(Value)
    .addReg(SrcReg);
 
  return Reg;
}
 
unsigned SIInstrInfo::getMovOpcode(const TargetRegisterClass *DstRC) const {
 
  if (RI.isAGPRClass(DstRC))
    return AMDGPU::COPY;
  if (RI.getRegSizeInBits(*DstRC) == 32) {
    return RI.isSGPRClass(DstRC) ? AMDGPU::S_MOV_B32 : AMDGPU::V_MOV_B32_e32;
  } else if (RI.getRegSizeInBits(*DstRC) == 64 && RI.isSGPRClass(DstRC)) {
    return AMDGPU::S_MOV_B64;
  } else if (RI.getRegSizeInBits(*DstRC) == 64 && !RI.isSGPRClass(DstRC)) {
    return  AMDGPU::V_MOV_B64_PSEUDO;
  }
  return AMDGPU::COPY;
}
 
const MCInstrDesc &
SIInstrInfo::getIndirectGPRIDXPseudo(unsigned VecSize,
                                     bool IsIndirectSrc) const {
  if (IsIndirectSrc) {
    if (VecSize <= 32) // 4 bytes
      return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V1);
    if (VecSize <= 64) // 8 bytes
      return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V2);
    if (VecSize <= 96) // 12 bytes
      return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V3);
    if (VecSize <= 128) // 16 bytes
      return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V4);
    if (VecSize <= 160) // 20 bytes
      return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V5);
    if (VecSize <= 256) // 32 bytes
      return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V8);
    if (VecSize <= 512) // 64 bytes
      return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V16);
    if (VecSize <= 1024) // 128 bytes
      return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V32);
 
    llvm_unreachable("unsupported size for IndirectRegReadGPRIDX pseudos");
  }
 
  if (VecSize <= 32) // 4 bytes
    return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V1);
  if (VecSize <= 64) // 8 bytes
    return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V2);
  if (VecSize <= 96) // 12 bytes
    return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V3);
  if (VecSize <= 128) // 16 bytes
    return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V4);
  if (VecSize <= 160) // 20 bytes
    return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V5);
  if (VecSize <= 256) // 32 bytes
    return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V8);
  if (VecSize <= 512) // 64 bytes
    return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V16);
  if (VecSize <= 1024) // 128 bytes
    return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V32);
 
  llvm_unreachable("unsupported size for IndirectRegWriteGPRIDX pseudos");
}
 
static unsigned getIndirectVGPRWriteMovRelPseudoOpc(unsigned VecSize) {
  if (VecSize <= 32) // 4 bytes
    return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V1;
  if (VecSize <= 64) // 8 bytes
    return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V2;
  if (VecSize <= 96) // 12 bytes
    return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V3;
  if (VecSize <= 128) // 16 bytes
    return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V4;
  if (VecSize <= 160) // 20 bytes
    return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V5;
  if (VecSize <= 256) // 32 bytes
    return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V8;
  if (VecSize <= 512) // 64 bytes
    return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V16;
  if (VecSize <= 1024) // 128 bytes
    return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V32;
 
  llvm_unreachable("unsupported size for IndirectRegWrite pseudos");
}
 
static unsigned getIndirectSGPRWriteMovRelPseudo32(unsigned VecSize) {
  if (VecSize <= 32) // 4 bytes
    return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V1;
  if (VecSize <= 64) // 8 bytes
    return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V2;
  if (VecSize <= 96) // 12 bytes
    return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V3;
  if (VecSize <= 128) // 16 bytes
    return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V4;
  if (VecSize <= 160) // 20 bytes
    return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V5;
  if (VecSize <= 256) // 32 bytes
    return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V8;
  if (VecSize <= 512) // 64 bytes
    return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V16;
  if (VecSize <= 1024) // 128 bytes
    return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V32;
 
  llvm_unreachable("unsupported size for IndirectRegWrite pseudos");
}
 
static unsigned getIndirectSGPRWriteMovRelPseudo64(unsigned VecSize) {
  if (VecSize <= 64) // 8 bytes
    return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V1;
  if (VecSize <= 128) // 16 bytes
    return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V2;
  if (VecSize <= 256) // 32 bytes
    return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V4;
  if (VecSize <= 512) // 64 bytes
    return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V8;
  if (VecSize <= 1024) // 128 bytes
    return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V16;
 
  llvm_unreachable("unsupported size for IndirectRegWrite pseudos");
}
 
const MCInstrDesc &
SIInstrInfo::getIndirectRegWriteMovRelPseudo(unsigned VecSize, unsigned EltSize,
                                             bool IsSGPR) const {
  if (IsSGPR) {
    switch (EltSize) {
    case 32:
      return get(getIndirectSGPRWriteMovRelPseudo32(VecSize));
    case 64:
      return get(getIndirectSGPRWriteMovRelPseudo64(VecSize));
    default:
      llvm_unreachable("invalid reg indexing elt size");
    }
  }
 
  assert(EltSize == 32 && "invalid reg indexing elt size");
  return get(getIndirectVGPRWriteMovRelPseudoOpc(VecSize));
}
 
static unsigned getSGPRSpillSaveOpcode(unsigned Size) {
  switch (Size) {
  case 4:
    return AMDGPU::SI_SPILL_S32_SAVE;
  case 8:
    return AMDGPU::SI_SPILL_S64_SAVE;
  case 12:
    return AMDGPU::SI_SPILL_S96_SAVE;
  case 16:
    return AMDGPU::SI_SPILL_S128_SAVE;
  case 20:
    return AMDGPU::SI_SPILL_S160_SAVE;
  case 24:
    return AMDGPU::SI_SPILL_S192_SAVE;
  case 28:
    return AMDGPU::SI_SPILL_S224_SAVE;
  case 32:
    return AMDGPU::SI_SPILL_S256_SAVE;
  case 64:
    return AMDGPU::SI_SPILL_S512_SAVE;
  case 128:
    return AMDGPU::SI_SPILL_S1024_SAVE;
  default:
    llvm_unreachable("unknown register size");
  }
}
 
static unsigned getVGPRSpillSaveOpcode(unsigned Size) {
  switch (Size) {
  case 4:
    return AMDGPU::SI_SPILL_V32_SAVE;
  case 8:
    return AMDGPU::SI_SPILL_V64_SAVE;
  case 12:
    return AMDGPU::SI_SPILL_V96_SAVE;
  case 16:
    return AMDGPU::SI_SPILL_V128_SAVE;
  case 20:
    return AMDGPU::SI_SPILL_V160_SAVE;
  case 24:
    return AMDGPU::SI_SPILL_V192_SAVE;
  case 28:
    return AMDGPU::SI_SPILL_V224_SAVE;
  case 32:
    return AMDGPU::SI_SPILL_V256_SAVE;
  case 64:
    return AMDGPU::SI_SPILL_V512_SAVE;
  case 128:
    return AMDGPU::SI_SPILL_V1024_SAVE;
  default:
    llvm_unreachable("unknown register size");
  }
}
 
static unsigned getAGPRSpillSaveOpcode(unsigned Size) {
  switch (Size) {
  case 4:
    return AMDGPU::SI_SPILL_A32_SAVE;
  case 8:
    return AMDGPU::SI_SPILL_A64_SAVE;
  case 12:
    return AMDGPU::SI_SPILL_A96_SAVE;
  case 16:
    return AMDGPU::SI_SPILL_A128_SAVE;
  case 20:
    return AMDGPU::SI_SPILL_A160_SAVE;
  case 24:
    return AMDGPU::SI_SPILL_A192_SAVE;
  case 28:
    return AMDGPU::SI_SPILL_A224_SAVE;
  case 32:
    return AMDGPU::SI_SPILL_A256_SAVE;
  case 64:
    return AMDGPU::SI_SPILL_A512_SAVE;
  case 128:
    return AMDGPU::SI_SPILL_A1024_SAVE;
  default:
    llvm_unreachable("unknown register size");
  }
}
 
static unsigned getAVSpillSaveOpcode(unsigned Size) {
  switch (Size) {
  case 4:
    return AMDGPU::SI_SPILL_AV32_SAVE;
  case 8:
    return AMDGPU::SI_SPILL_AV64_SAVE;
  case 12:
    return AMDGPU::SI_SPILL_AV96_SAVE;
  case 16:
    return AMDGPU::SI_SPILL_AV128_SAVE;
  case 20:
    return AMDGPU::SI_SPILL_AV160_SAVE;
  case 24:
    return AMDGPU::SI_SPILL_AV192_SAVE;
  case 28:
    return AMDGPU::SI_SPILL_AV224_SAVE;
  case 32:
    return AMDGPU::SI_SPILL_AV256_SAVE;
  case 64:
    return AMDGPU::SI_SPILL_AV512_SAVE;
  case 128:
    return AMDGPU::SI_SPILL_AV1024_SAVE;
  default:
    llvm_unreachable("unknown register size");
  }
}
 
void SIInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
                                      MachineBasicBlock::iterator MI,
                                      Register SrcReg, bool isKill,
                                      int FrameIndex,
                                      const TargetRegisterClass *RC,
                                      const TargetRegisterInfo *TRI) const {
  MachineFunction *MF = MBB.getParent();
  SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();
  MachineFrameInfo &FrameInfo = MF->getFrameInfo();
  const DebugLoc &DL = MBB.findDebugLoc(MI);
 
  MachinePointerInfo PtrInfo
    = MachinePointerInfo::getFixedStack(*MF, FrameIndex);
  MachineMemOperand *MMO = MF->getMachineMemOperand(
      PtrInfo, MachineMemOperand::MOStore, FrameInfo.getObjectSize(FrameIndex),
      FrameInfo.getObjectAlign(FrameIndex));
  unsigned SpillSize = TRI->getSpillSize(*RC);
 
  MachineRegisterInfo &MRI = MF->getRegInfo();
  if (RI.isSGPRClass(RC)) {
    MFI->setHasSpilledSGPRs();
    assert(SrcReg != AMDGPU::M0 && "m0 should not be spilled");
    assert(SrcReg != AMDGPU::EXEC_LO && SrcReg != AMDGPU::EXEC_HI &&
           SrcReg != AMDGPU::EXEC && "exec should not be spilled");
 
    // We are only allowed to create one new instruction when spilling
    // registers, so we need to use pseudo instruction for spilling SGPRs.
    const MCInstrDesc &OpDesc = get(getSGPRSpillSaveOpcode(SpillSize));
 
    // The SGPR spill/restore instructions only work on number sgprs, so we need
    // to make sure we are using the correct register class.
    if (SrcReg.isVirtual() && SpillSize == 4) {
      MRI.constrainRegClass(SrcReg, &AMDGPU::SReg_32_XM0_XEXECRegClass);
    }
 
    BuildMI(MBB, MI, DL, OpDesc)
      .addReg(SrcReg, getKillRegState(isKill)) // data
      .addFrameIndex(FrameIndex)               // addr
      .addMemOperand(MMO)
      .addReg(MFI->getStackPtrOffsetReg(), RegState::Implicit);
 
    if (RI.spillSGPRToVGPR())
      FrameInfo.setStackID(FrameIndex, TargetStackID::SGPRSpill);
    return;
  }
 
  unsigned Opcode = RI.isVectorSuperClass(RC) ? getAVSpillSaveOpcode(SpillSize)
                    : RI.isAGPRClass(RC) ? getAGPRSpillSaveOpcode(SpillSize)
                                         : getVGPRSpillSaveOpcode(SpillSize);
  MFI->setHasSpilledVGPRs();
 
  BuildMI(MBB, MI, DL, get(Opcode))
    .addReg(SrcReg, getKillRegState(isKill)) // data
    .addFrameIndex(FrameIndex)               // addr
    .addReg(MFI->getStackPtrOffsetReg())     // scratch_offset
    .addImm(0)                               // offset
    .addMemOperand(MMO);
}
 
static unsigned getSGPRSpillRestoreOpcode(unsigned Size) {
  switch (Size) {
  case 4:
    return AMDGPU::SI_SPILL_S32_RESTORE;
  case 8:
    return AMDGPU::SI_SPILL_S64_RESTORE;
  case 12:
    return AMDGPU::SI_SPILL_S96_RESTORE;
  case 16:
    return AMDGPU::SI_SPILL_S128_RESTORE;
  case 20:
    return AMDGPU::SI_SPILL_S160_RESTORE;
  case 24:
    return AMDGPU::SI_SPILL_S192_RESTORE;
  case 28:
    return AMDGPU::SI_SPILL_S224_RESTORE;
  case 32:
    return AMDGPU::SI_SPILL_S256_RESTORE;
  case 64:
    return AMDGPU::SI_SPILL_S512_RESTORE;
  case 128:
    return AMDGPU::SI_SPILL_S1024_RESTORE;
  default:
    llvm_unreachable("unknown register size");
  }
}
 
static unsigned getVGPRSpillRestoreOpcode(unsigned Size) {
  switch (Size) {
  case 4:
    return AMDGPU::SI_SPILL_V32_RESTORE;
  case 8:
    return AMDGPU::SI_SPILL_V64_RESTORE;
  case 12:
    return AMDGPU::SI_SPILL_V96_RESTORE;
  case 16:
    return AMDGPU::SI_SPILL_V128_RESTORE;
  case 20:
    return AMDGPU::SI_SPILL_V160_RESTORE;
  case 24:
    return AMDGPU::SI_SPILL_V192_RESTORE;
  case 28:
    return AMDGPU::SI_SPILL_V224_RESTORE;
  case 32:
    return AMDGPU::SI_SPILL_V256_RESTORE;
  case 64:
    return AMDGPU::SI_SPILL_V512_RESTORE;
  case 128:
    return AMDGPU::SI_SPILL_V1024_RESTORE;
  default:
    llvm_unreachable("unknown register size");
  }
}
 
static unsigned getAGPRSpillRestoreOpcode(unsigned Size) {
  switch (Size) {
  case 4:
    return AMDGPU::SI_SPILL_A32_RESTORE;
  case 8:
    return AMDGPU::SI_SPILL_A64_RESTORE;
  case 12:
    return AMDGPU::SI_SPILL_A96_RESTORE;
  case 16:
    return AMDGPU::SI_SPILL_A128_RESTORE;
  case 20:
    return AMDGPU::SI_SPILL_A160_RESTORE;
  case 24:
    return AMDGPU::SI_SPILL_A192_RESTORE;
  case 28:
    return AMDGPU::SI_SPILL_A224_RESTORE;
  case 32:
    return AMDGPU::SI_SPILL_A256_RESTORE;
  case 64:
    return AMDGPU::SI_SPILL_A512_RESTORE;
  case 128:
    return AMDGPU::SI_SPILL_A1024_RESTORE;
  default:
    llvm_unreachable("unknown register size");
  }
}
 
static unsigned getAVSpillRestoreOpcode(unsigned Size) {
  switch (Size) {
  case 4:
    return AMDGPU::SI_SPILL_AV32_RESTORE;
  case 8:
    return AMDGPU::SI_SPILL_AV64_RESTORE;
  case 12:
    return AMDGPU::SI_SPILL_AV96_RESTORE;
  case 16:
    return AMDGPU::SI_SPILL_AV128_RESTORE;
  case 20:
    return AMDGPU::SI_SPILL_AV160_RESTORE;
  case 24:
    return AMDGPU::SI_SPILL_AV192_RESTORE;
  case 28:
    return AMDGPU::SI_SPILL_AV224_RESTORE;
  case 32:
    return AMDGPU::SI_SPILL_AV256_RESTORE;
  case 64:
    return AMDGPU::SI_SPILL_AV512_RESTORE;
  case 128:
    return AMDGPU::SI_SPILL_AV1024_RESTORE;
  default:
    llvm_unreachable("unknown register size");
  }
}
 
void SIInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
                                       MachineBasicBlock::iterator MI,
                                       Register DestReg, int FrameIndex,
                                       const TargetRegisterClass *RC,
                                       const TargetRegisterInfo *TRI) const {
  MachineFunction *MF = MBB.getParent();
  SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();
  MachineFrameInfo &FrameInfo = MF->getFrameInfo();
  const DebugLoc &DL = MBB.findDebugLoc(MI);
  unsigned SpillSize = TRI->getSpillSize(*RC);
 
  MachinePointerInfo PtrInfo
    = MachinePointerInfo::getFixedStack(*MF, FrameIndex);
 
  MachineMemOperand *MMO = MF->getMachineMemOperand(
      PtrInfo, MachineMemOperand::MOLoad, FrameInfo.getObjectSize(FrameIndex),
      FrameInfo.getObjectAlign(FrameIndex));
 
  if (RI.isSGPRClass(RC)) {
    MFI->setHasSpilledSGPRs();
    assert(DestReg != AMDGPU::M0 && "m0 should not be reloaded into");
    assert(DestReg != AMDGPU::EXEC_LO && DestReg != AMDGPU::EXEC_HI &&
           DestReg != AMDGPU::EXEC && "exec should not be spilled");
 
    // FIXME: Maybe this should not include a memoperand because it will be
    // lowered to non-memory instructions.
    const MCInstrDesc &OpDesc = get(getSGPRSpillRestoreOpcode(SpillSize));
    if (DestReg.isVirtual() && SpillSize == 4) {
      MachineRegisterInfo &MRI = MF->getRegInfo();
      MRI.constrainRegClass(DestReg, &AMDGPU::SReg_32_XM0_XEXECRegClass);
    }
 
    if (RI.spillSGPRToVGPR())
      FrameInfo.setStackID(FrameIndex, TargetStackID::SGPRSpill);
    BuildMI(MBB, MI, DL, OpDesc, DestReg)
      .addFrameIndex(FrameIndex) // addr
      .addMemOperand(MMO)
      .addReg(MFI->getStackPtrOffsetReg(), RegState::Implicit);
 
    return;
  }
 
  unsigned Opcode = RI.isVectorSuperClass(RC)
                        ? getAVSpillRestoreOpcode(SpillSize)
                    : RI.isAGPRClass(RC) ? getAGPRSpillRestoreOpcode(SpillSize)
                                         : getVGPRSpillRestoreOpcode(SpillSize);
  BuildMI(MBB, MI, DL, get(Opcode), DestReg)
      .addFrameIndex(FrameIndex)           // vaddr
      .addReg(MFI->getStackPtrOffsetReg()) // scratch_offset
      .addImm(0)                           // offset
      .addMemOperand(MMO);
}
 
void SIInstrInfo::insertNoop(MachineBasicBlock &MBB,
                             MachineBasicBlock::iterator MI) const {
  insertNoops(MBB, MI, 1);
}
 
void SIInstrInfo::insertNoops(MachineBasicBlock &MBB,
                              MachineBasicBlock::iterator MI,
                              unsigned Quantity) const {
  DebugLoc DL = MBB.findDebugLoc(MI);
  while (Quantity > 0) {
    unsigned Arg = std::min(Quantity, 8u);
    Quantity -= Arg;
    BuildMI(MBB, MI, DL, get(AMDGPU::S_NOP)).addImm(Arg - 1);
  }
}
 
void SIInstrInfo::insertReturn(MachineBasicBlock &MBB) const {
  auto MF = MBB.getParent();
  SIMachineFunctionInfo *Info = MF->getInfo<SIMachineFunctionInfo>();
 
  assert(Info->isEntryFunction());
 
  if (MBB.succ_empty()) {
    bool HasNoTerminator = MBB.getFirstTerminator() == MBB.end();
    if (HasNoTerminator) {
      if (Info->returnsVoid()) {
        BuildMI(MBB, MBB.end(), DebugLoc(), get(AMDGPU::S_ENDPGM)).addImm(0);
      } else {
        BuildMI(MBB, MBB.end(), DebugLoc(), get(AMDGPU::SI_RETURN_TO_EPILOG));
      }
    }
  }
}
 
unsigned SIInstrInfo::getNumWaitStates(const MachineInstr &MI) {
  switch (MI.getOpcode()) {
  default:
    if (MI.isMetaInstruction())
      return 0;
    return 1; // FIXME: Do wait states equal cycles?
 
  case AMDGPU::S_NOP:
    return MI.getOperand(0).getImm() + 1;
  // SI_RETURN_TO_EPILOG is a fallthrough to code outside of the function. The
  // hazard, even if one exist, won't really be visible. Should we handle it?
  }
}
 
bool SIInstrInfo::expandPostRAPseudo(MachineInstr &MI) const {
  const SIRegisterInfo *TRI = ST.getRegisterInfo();
  MachineBasicBlock &MBB = *MI.getParent();
  DebugLoc DL = MBB.findDebugLoc(MI);
  switch (MI.getOpcode()) {
  default: return TargetInstrInfo::expandPostRAPseudo(MI);
  case AMDGPU::S_MOV_B64_term:
    // This is only a terminator to get the correct spill code placement during
    // register allocation.
    MI.setDesc(get(AMDGPU::S_MOV_B64));
    break;
 
  case AMDGPU::S_MOV_B32_term:
    // This is only a terminator to get the correct spill code placement during
    // register allocation.
    MI.setDesc(get(AMDGPU::S_MOV_B32));
    break;
 
  case AMDGPU::S_XOR_B64_term:
    // This is only a terminator to get the correct spill code placement during
    // register allocation.
    MI.setDesc(get(AMDGPU::S_XOR_B64));
    break;
 
  case AMDGPU::S_XOR_B32_term:
    // This is only a terminator to get the correct spill code placement during
    // register allocation.
    MI.setDesc(get(AMDGPU::S_XOR_B32));
    break;
  case AMDGPU::S_OR_B64_term:
    // This is only a terminator to get the correct spill code placement during
    // register allocation.
    MI.setDesc(get(AMDGPU::S_OR_B64));
    break;
  case AMDGPU::S_OR_B32_term:
    // This is only a terminator to get the correct spill code placement during
    // register allocation.
    MI.setDesc(get(AMDGPU::S_OR_B32));
    break;
 
  case AMDGPU::S_ANDN2_B64_term:
    // This is only a terminator to get the correct spill code placement during
    // register allocation.
    MI.setDesc(get(AMDGPU::S_ANDN2_B64));
    break;
 
  case AMDGPU::S_ANDN2_B32_term:
    // This is only a terminator to get the correct spill code placement during
    // register allocation.
    MI.setDesc(get(AMDGPU::S_ANDN2_B32));
    break;
 
  case AMDGPU::S_AND_B64_term:
    // This is only a terminator to get the correct spill code placement during
    // register allocation.
    MI.setDesc(get(AMDGPU::S_AND_B64));
    break;
 
  case AMDGPU::S_AND_B32_term:
    // This is only a terminator to get the correct spill code placement during
    // register allocation.
    MI.setDesc(get(AMDGPU::S_AND_B32));
    break;
 
  case AMDGPU::V_MOV_B64_PSEUDO: {
    Register Dst = MI.getOperand(0).getReg();
    Register DstLo = RI.getSubReg(Dst, AMDGPU::sub0);
    Register DstHi = RI.getSubReg(Dst, AMDGPU::sub1);
 
    const MachineOperand &SrcOp = MI.getOperand(1);
    // FIXME: Will this work for 64-bit floating point immediates?
    assert(!SrcOp.isFPImm());
    if (ST.hasMovB64()) {
      MI.setDesc(get(AMDGPU::V_MOV_B64_e32));
      if (!isLiteralConstant(MI, 1) || isUInt<32>(SrcOp.getImm()))
        break;
    }
    if (SrcOp.isImm()) {
      APInt Imm(64, SrcOp.getImm());
      APInt Lo(32, Imm.getLoBits(32).getZExtValue());
      APInt Hi(32, Imm.getHiBits(32).getZExtValue());
      if (ST.hasPackedFP32Ops() && Lo == Hi && isInlineConstant(Lo)) {
        BuildMI(MBB, MI, DL, get(AMDGPU::V_PK_MOV_B32), Dst)
          .addImm(SISrcMods::OP_SEL_1)
          .addImm(Lo.getSExtValue())
          .addImm(SISrcMods::OP_SEL_1)
          .addImm(Lo.getSExtValue())
          .addImm(0)  // op_sel_lo
          .addImm(0)  // op_sel_hi
          .addImm(0)  // neg_lo
          .addImm(0)  // neg_hi
          .addImm(0); // clamp
      } else {
        BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstLo)
          .addImm(Lo.getSExtValue())
          .addReg(Dst, RegState::Implicit | RegState::Define);
        BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstHi)
          .addImm(Hi.getSExtValue())
          .addReg(Dst, RegState::Implicit | RegState::Define);
      }
    } else {
      assert(SrcOp.isReg());
      if (ST.hasPackedFP32Ops() &&
          !RI.isAGPR(MBB.getParent()->getRegInfo(), SrcOp.getReg())) {
        BuildMI(MBB, MI, DL, get(AMDGPU::V_PK_MOV_B32), Dst)
          .addImm(SISrcMods::OP_SEL_1) // src0_mod
          .addReg(SrcOp.getReg())
          .addImm(SISrcMods::OP_SEL_0 | SISrcMods::OP_SEL_1) // src1_mod
          .addReg(SrcOp.getReg())
          .addImm(0)  // op_sel_lo
          .addImm(0)  // op_sel_hi
          .addImm(0)  // neg_lo
          .addImm(0)  // neg_hi
          .addImm(0); // clamp
      } else {
        BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstLo)
          .addReg(RI.getSubReg(SrcOp.getReg(), AMDGPU::sub0))
          .addReg(Dst, RegState::Implicit | RegState::Define);
        BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstHi)
          .addReg(RI.getSubReg(SrcOp.getReg(), AMDGPU::sub1))
          .addReg(Dst, RegState::Implicit | RegState::Define);
      }
    }
    MI.eraseFromParent();
    break;
  }
  case AMDGPU::V_MOV_B64_DPP_PSEUDO: {
    expandMovDPP64(MI);
    break;
  }
  case AMDGPU::S_MOV_B64_IMM_PSEUDO: {
    const MachineOperand &SrcOp = MI.getOperand(1);
    assert(!SrcOp.isFPImm());
    APInt Imm(64, SrcOp.getImm());
    if (Imm.isIntN(32) || isInlineConstant(Imm)) {
      MI.setDesc(get(AMDGPU::S_MOV_B64));
      break;
    }
 
    Register Dst = MI.getOperand(0).getReg();
    Register DstLo = RI.getSubReg(Dst, AMDGPU::sub0);
    Register DstHi = RI.getSubReg(Dst, AMDGPU::sub1);
 
    APInt Lo(32, Imm.getLoBits(32).getZExtValue());
    APInt Hi(32, Imm.getHiBits(32).getZExtValue());
    BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), DstLo)
      .addImm(Lo.getSExtValue())
      .addReg(Dst, RegState::Implicit | RegState::Define);
    BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), DstHi)
      .addImm(Hi.getSExtValue())
      .addReg(Dst, RegState::Implicit | RegState::Define);
    MI.eraseFromParent();
    break;
  }
  case AMDGPU::V_SET_INACTIVE_B32: {
    unsigned NotOpc = ST.isWave32() ? AMDGPU::S_NOT_B32 : AMDGPU::S_NOT_B64;
    unsigned Exec = ST.isWave32() ? AMDGPU::EXEC_LO : AMDGPU::EXEC;
    // FIXME: We may possibly optimize the COPY once we find ways to make LLVM
    // optimizations (mainly Register Coalescer) aware of WWM register liveness.
    BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), MI.getOperand(0).getReg())
        .add(MI.getOperand(1));
    auto FirstNot = BuildMI(MBB, MI, DL, get(NotOpc), Exec).addReg(Exec);
    FirstNot->addRegisterDead(AMDGPU::SCC, TRI); // SCC is overwritten
    BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), MI.getOperand(0).getReg())
      .add(MI.getOperand(2));
    BuildMI(MBB, MI, DL, get(NotOpc), Exec)
      .addReg(Exec);
    MI.eraseFromParent();
    break;
  }
  case AMDGPU::V_SET_INACTIVE_B64: {
    unsigned NotOpc = ST.isWave32() ? AMDGPU::S_NOT_B32 : AMDGPU::S_NOT_B64;
    unsigned Exec = ST.isWave32() ? AMDGPU::EXEC_LO : AMDGPU::EXEC;
    MachineInstr *Copy = BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B64_PSEUDO),
                                 MI.getOperand(0).getReg())
                             .add(MI.getOperand(1));
    expandPostRAPseudo(*Copy);
    auto FirstNot = BuildMI(MBB, MI, DL, get(NotOpc), Exec).addReg(Exec);
    FirstNot->addRegisterDead(AMDGPU::SCC, TRI); // SCC is overwritten
    Copy = BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B64_PSEUDO),
                   MI.getOperand(0).getReg())
               .add(MI.getOperand(2));
    expandPostRAPseudo(*Copy);
    BuildMI(MBB, MI, DL, get(NotOpc), Exec)
      .addReg(Exec);
    MI.eraseFromParent();
    break;
  }
  case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V1:
  case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V2:
  case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V3:
  case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V4:
  case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V5:
  case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V8:
  case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V16:
  case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V32:
  case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V1:
  case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V2:
  case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V3:
  case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V4:
  case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V5:
  case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V8:
  case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V16:
  case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V32:
  case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V1:
  case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V2:
  case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V4:
  case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V8:
  case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V16: {
    const TargetRegisterClass *EltRC = getOpRegClass(MI, 2);
 
    unsigned Opc;
    if (RI.hasVGPRs(EltRC)) {
      Opc = AMDGPU::V_MOVRELD_B32_e32;
    } else {
      Opc = RI.getRegSizeInBits(*EltRC) == 64 ? AMDGPU::S_MOVRELD_B64
                                              : AMDGPU::S_MOVRELD_B32;
    }
 
    const MCInstrDesc &OpDesc = get(Opc);
    Register VecReg = MI.getOperand(0).getReg();
    bool IsUndef = MI.getOperand(1).isUndef();
    unsigned SubReg = MI.getOperand(3).getImm();
    assert(VecReg == MI.getOperand(1).getReg());
 
    MachineInstrBuilder MIB =
      BuildMI(MBB, MI, DL, OpDesc)
        .addReg(RI.getSubReg(VecReg, SubReg), RegState::Undef)
        .add(MI.getOperand(2))
        .addReg(VecReg, RegState::ImplicitDefine)
        .addReg(VecReg, RegState::Implicit | (IsUndef ? RegState::Undef : 0));
 
    const int ImpDefIdx =
      OpDesc.getNumOperands() + OpDesc.getNumImplicitUses();
    const int ImpUseIdx = ImpDefIdx + 1;
    MIB->tieOperands(ImpDefIdx, ImpUseIdx);
    MI.eraseFromParent();
    break;
  }
  case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V1:
  case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V2:
  case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V3:
  case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V4:
  case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V5:
  case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V8:
  case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V16:
  case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V32: {
    assert(ST.useVGPRIndexMode());
    Register VecReg = MI.getOperand(0).getReg();
    bool IsUndef = MI.getOperand(1).isUndef();
    Register Idx = MI.getOperand(3).getReg();
    Register SubReg = MI.getOperand(4).getImm();
 
    MachineInstr *SetOn = BuildMI(MBB, MI, DL, get(AMDGPU::S_SET_GPR_IDX_ON))
                              .addReg(Idx)
                              .addImm(AMDGPU::VGPRIndexMode::DST_ENABLE);
    SetOn->getOperand(3).setIsUndef();
 
    const MCInstrDesc &OpDesc = get(AMDGPU::V_MOV_B32_indirect_write);
    MachineInstrBuilder MIB =
        BuildMI(MBB, MI, DL, OpDesc)
            .addReg(RI.getSubReg(VecReg, SubReg), RegState::Undef)
            .add(MI.getOperand(2))
            .addReg(VecReg, RegState::ImplicitDefine)
            .addReg(VecReg,
                    RegState::Implicit | (IsUndef ? RegState::Undef : 0));
 
    const int ImpDefIdx = OpDesc.getNumOperands() + OpDesc.getNumImplicitUses();
    const int ImpUseIdx = ImpDefIdx + 1;
    MIB->tieOperands(ImpDefIdx, ImpUseIdx);
 
    MachineInstr *SetOff = BuildMI(MBB, MI, DL, get(AMDGPU::S_SET_GPR_IDX_OFF));
 
    finalizeBundle(MBB, SetOn->getIterator(), std::next(SetOff->getIterator()));
 
    MI.eraseFromParent();
    break;
  }
  case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V1:
  case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V2:
  case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V3:
  case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V4:
  case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V5:
  case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V8:
  case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V16:
  case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V32: {
    assert(ST.useVGPRIndexMode());
    Register Dst = MI.getOperand(0).getReg();
    Register VecReg = MI.getOperand(1).getReg();
    bool IsUndef = MI.getOperand(1).isUndef();
    Register Idx = MI.getOperand(2).getReg();
    Register SubReg = MI.getOperand(3).getImm();
 
    MachineInstr *SetOn = BuildMI(MBB, MI, DL, get(AMDGPU::S_SET_GPR_IDX_ON))
                              .addReg(Idx)
                              .addImm(AMDGPU::VGPRIndexMode::SRC0_ENABLE);
    SetOn->getOperand(3).setIsUndef();
 
    BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_indirect_read))
        .addDef(Dst)
        .addReg(RI.getSubReg(VecReg, SubReg), RegState::Undef)
        .addReg(VecReg, RegState::Implicit | (IsUndef ? RegState::Undef : 0));
 
    MachineInstr *SetOff = BuildMI(MBB, MI, DL, get(AMDGPU::S_SET_GPR_IDX_OFF));
 
    finalizeBundle(MBB, SetOn->getIterator(), std::next(SetOff->getIterator()));
 
    MI.eraseFromParent();
    break;
  }
  case AMDGPU::SI_PC_ADD_REL_OFFSET: {
    MachineFunction &MF = *MBB.getParent();
    Register Reg = MI.getOperand(0).getReg();
    Register RegLo = RI.getSubReg(Reg, AMDGPU::sub0);
    Register RegHi = RI.getSubReg(Reg, AMDGPU::sub1);
 
    // Create a bundle so these instructions won't be re-ordered by the
    // post-RA scheduler.
    MIBundleBuilder Bundler(MBB, MI);
    Bundler.append(BuildMI(MF, DL, get(AMDGPU::S_GETPC_B64), Reg));
 
    // Add 32-bit offset from this instruction to the start of the
    // constant data.
    Bundler.append(BuildMI(MF, DL, get(AMDGPU::S_ADD_U32), RegLo)
                       .addReg(RegLo)
                       .add(MI.getOperand(1)));
 
    MachineInstrBuilder MIB = BuildMI(MF, DL, get(AMDGPU::S_ADDC_U32), RegHi)
                                  .addReg(RegHi);
    MIB.add(MI.getOperand(2));
 
    Bundler.append(MIB);
    finalizeBundle(MBB, Bundler.begin());
 
    MI.eraseFromParent();
    break;
  }
  case AMDGPU::ENTER_STRICT_WWM: {
    // This only gets its own opcode so that SIPreAllocateWWMRegs can tell when
    // Whole Wave Mode is entered.
    MI.setDesc(get(ST.isWave32() ? AMDGPU::S_OR_SAVEEXEC_B32
                                 : AMDGPU::S_OR_SAVEEXEC_B64));
    break;
  }
  case AMDGPU::ENTER_STRICT_WQM: {
    // This only gets its own opcode so that SIPreAllocateWWMRegs can tell when
    // STRICT_WQM is entered.
    const unsigned Exec = ST.isWave32() ? AMDGPU::EXEC_LO : AMDGPU::EXEC;
    const unsigned WQMOp = ST.isWave32() ? AMDGPU::S_WQM_B32 : AMDGPU::S_WQM_B64;
    const unsigned MovOp = ST.isWave32() ? AMDGPU::S_MOV_B32 : AMDGPU::S_MOV_B64;
    BuildMI(MBB, MI, DL, get(MovOp), MI.getOperand(0).getReg()).addReg(Exec);
    BuildMI(MBB, MI, DL, get(WQMOp), Exec).addReg(Exec);
 
    MI.eraseFromParent();
    break;
  }
  case AMDGPU::EXIT_STRICT_WWM:
  case AMDGPU::EXIT_STRICT_WQM: {
    // This only gets its own opcode so that SIPreAllocateWWMRegs can tell when
    // WWM/STICT_WQM is exited.
    MI.setDesc(get(ST.isWave32() ? AMDGPU::S_MOV_B32 : AMDGPU::S_MOV_B64));
    break;
  }
  case AMDGPU::SI_RETURN: {
    const MachineFunction *MF = MBB.getParent();
    const GCNSubtarget &ST = MF->getSubtarget<GCNSubtarget>();
    const SIRegisterInfo *TRI = ST.getRegisterInfo();
    // Hiding the return address use with SI_RETURN may lead to extra kills in
    // the function and missing live-ins. We are fine in practice because callee
    // saved register handling ensures the register value is restored before
    // RET, but we need the undef flag here to appease the MachineVerifier
    // liveness checks.
    MachineInstrBuilder MIB =
        BuildMI(MBB, MI, DL, get(AMDGPU::S_SETPC_B64_return))
            .addReg(TRI->getReturnAddressReg(*MF), RegState::Undef);
 
    MIB.copyImplicitOps(MI);
    MI.eraseFromParent();
    break;
  }
  }
  return true;
}
 
std::pair<MachineInstr*, MachineInstr*>
SIInstrInfo::expandMovDPP64(MachineInstr &MI) const {
  assert (MI.getOpcode() == AMDGPU::V_MOV_B64_DPP_PSEUDO);
 
  if (ST.hasMovB64() &&
      AMDGPU::isLegal64BitDPPControl(
        getNamedOperand(MI, AMDGPU::OpName::dpp_ctrl)->getImm())) {
    MI.setDesc(get(AMDGPU::V_MOV_B64_dpp));
    return std::make_pair(&MI, nullptr);
  }
 
  MachineBasicBlock &MBB = *MI.getParent();
  DebugLoc DL = MBB.findDebugLoc(MI);
  MachineFunction *MF = MBB.getParent();
  MachineRegisterInfo &MRI = MF->getRegInfo();
  Register Dst = MI.getOperand(0).getReg();
  unsigned Part = 0;
  MachineInstr *Split[2];
 
  for (auto Sub : { AMDGPU::sub0, AMDGPU::sub1 }) {
    auto MovDPP = BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_dpp));
    if (Dst.isPhysical()) {
      MovDPP.addDef(RI.getSubReg(Dst, Sub));
    } else {
      assert(MRI.isSSA());
      auto Tmp = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
      MovDPP.addDef(Tmp);
    }
 
    for (unsigned I = 1; I <= 2; ++I) { // old and src operands.
      const MachineOperand &SrcOp = MI.getOperand(I);
      assert(!SrcOp.isFPImm());
      if (SrcOp.isImm()) {
        APInt Imm(64, SrcOp.getImm());
        Imm.ashrInPlace(Part * 32);
        MovDPP.addImm(Imm.getLoBits(32).getZExtValue());
      } else {
        assert(SrcOp.isReg());
        Register Src = SrcOp.getReg();
        if (Src.isPhysical())
          MovDPP.addReg(RI.getSubReg(Src, Sub));
        else
          MovDPP.addReg(Src, SrcOp.isUndef() ? RegState::Undef : 0, Sub);
      }
    }
 
    for (unsigned I = 3; I < MI.getNumExplicitOperands(); ++I)
      MovDPP.addImm(MI.getOperand(I).getImm());
 
    Split[Part] = MovDPP;
    ++Part;
  }
 
  if (Dst.isVirtual())
    BuildMI(MBB, MI, DL, get(AMDGPU::REG_SEQUENCE), Dst)
      .addReg(Split[0]->getOperand(0).getReg())
      .addImm(AMDGPU::sub0)
      .addReg(Split[1]->getOperand(0).getReg())
      .addImm(AMDGPU::sub1);
 
  MI.eraseFromParent();
  return std::make_pair(Split[0], Split[1]);
}
 
bool SIInstrInfo::swapSourceModifiers(MachineInstr &MI,
                                      MachineOperand &Src0,
                                      unsigned Src0OpName,
                                      MachineOperand &Src1,
                                      unsigned Src1OpName) const {
  MachineOperand *Src0Mods = getNamedOperand(MI, Src0OpName);
  if (!Src0Mods)
    return false;
 
  MachineOperand *Src1Mods = getNamedOperand(MI, Src1OpName);
  assert(Src1Mods &&
         "All commutable instructions have both src0 and src1 modifiers");
 
  int Src0ModsVal = Src0Mods->getImm();
  int Src1ModsVal = Src1Mods->getImm();
 
  Src1Mods->setImm(Src0ModsVal);
  Src0Mods->setImm(Src1ModsVal);
  return true;
}
 
static MachineInstr *swapRegAndNonRegOperand(MachineInstr &MI,
                                             MachineOperand &RegOp,
                                             MachineOperand &NonRegOp) {
  Register Reg = RegOp.getReg();
  unsigned SubReg = RegOp.getSubReg();
  bool IsKill = RegOp.isKill();
  bool IsDead = RegOp.isDead();
  bool IsUndef = RegOp.isUndef();
  bool IsDebug = RegOp.isDebug();
 
  if (NonRegOp.isImm())
    RegOp.ChangeToImmediate(NonRegOp.getImm());
  else if (NonRegOp.isFI())
    RegOp.ChangeToFrameIndex(NonRegOp.getIndex());
  else if (NonRegOp.isGlobal()) {
    RegOp.ChangeToGA(NonRegOp.getGlobal(), NonRegOp.getOffset(),
                     NonRegOp.getTargetFlags());
  } else
    return nullptr;
 
  // Make sure we don't reinterpret a subreg index in the target flags.
  RegOp.setTargetFlags(NonRegOp.getTargetFlags());
 
  NonRegOp.ChangeToRegister(Reg, false, false, IsKill, IsDead, IsUndef, IsDebug);
  NonRegOp.setSubReg(SubReg);
 
  return &MI;
}
 
MachineInstr *SIInstrInfo::commuteInstructionImpl(MachineInstr &MI, bool NewMI,
                                                  unsigned Src0Idx,
                                                  unsigned Src1Idx) const {
  assert(!NewMI && "this should never be used");
 
  unsigned Opc = MI.getOpcode();
  int CommutedOpcode = commuteOpcode(Opc);
  if (CommutedOpcode == -1)
    return nullptr;
 
  assert(AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0) ==
           static_cast<int>(Src0Idx) &&
         AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1) ==
           static_cast<int>(Src1Idx) &&
         "inconsistency with findCommutedOpIndices");
 
  MachineOperand &Src0 = MI.getOperand(Src0Idx);
  MachineOperand &Src1 = MI.getOperand(Src1Idx);
 
  MachineInstr *CommutedMI = nullptr;
  if (Src0.isReg() && Src1.isReg()) {
    if (isOperandLegal(MI, Src1Idx, &Src0)) {
      // Be sure to copy the source modifiers to the right place.
      CommutedMI
        = TargetInstrInfo::commuteInstructionImpl(MI, NewMI, Src0Idx, Src1Idx);
    }
 
  } else if (Src0.isReg() && !Src1.isReg()) {
    // src0 should always be able to support any operand type, so no need to
    // check operand legality.
    CommutedMI = swapRegAndNonRegOperand(MI, Src0, Src1);
  } else if (!Src0.isReg() && Src1.isReg()) {
    if (isOperandLegal(MI, Src1Idx, &Src0))
      CommutedMI = swapRegAndNonRegOperand(MI, Src1, Src0);
  } else {
    // FIXME: Found two non registers to commute. This does happen.
    return nullptr;
  }
 
  if (CommutedMI) {
    swapSourceModifiers(MI, Src0, AMDGPU::OpName::src0_modifiers,
                        Src1, AMDGPU::OpName::src1_modifiers);
 
    CommutedMI->setDesc(get(CommutedOpcode));
  }
 
  return CommutedMI;
}
 
// This needs to be implemented because the source modifiers may be inserted
// between the true commutable operands, and the base
// TargetInstrInfo::commuteInstruction uses it.
bool SIInstrInfo::findCommutedOpIndices(const MachineInstr &MI,
                                        unsigned &SrcOpIdx0,
                                        unsigned &SrcOpIdx1) const {
  return findCommutedOpIndices(MI.getDesc(), SrcOpIdx0, SrcOpIdx1);
}
 
bool SIInstrInfo::findCommutedOpIndices(MCInstrDesc Desc, unsigned &SrcOpIdx0,
                                        unsigned &SrcOpIdx1) const {
  if (!Desc.isCommutable())
    return false;
 
  unsigned Opc = Desc.getOpcode();
  int Src0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0);
  if (Src0Idx == -1)
    return false;
 
  int Src1Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1);
  if (Src1Idx == -1)
    return false;
 
  return fixCommutedOpIndices(SrcOpIdx0, SrcOpIdx1, Src0Idx, Src1Idx);
}
 
bool SIInstrInfo::isBranchOffsetInRange(unsigned BranchOp,
                                        int64_t BrOffset) const {
  // BranchRelaxation should never have to check s_setpc_b64 because its dest
  // block is unanalyzable.
  assert(BranchOp != AMDGPU::S_SETPC_B64);
 
  // Convert to dwords.
  BrOffset /= 4;
 
  // The branch instructions do PC += signext(SIMM16 * 4) + 4, so the offset is
  // from the next instruction.
  BrOffset -= 1;
 
  return isIntN(BranchOffsetBits, BrOffset);
}
 
MachineBasicBlock *SIInstrInfo::getBranchDestBlock(
  const MachineInstr &MI) const {
  if (MI.getOpcode() == AMDGPU::S_SETPC_B64) {
    // This would be a difficult analysis to perform, but can always be legal so
    // there's no need to analyze it.
    return nullptr;
  }
 
  return MI.getOperand(0).getMBB();
}
 
void SIInstrInfo::insertIndirectBranch(MachineBasicBlock &MBB,
                                       MachineBasicBlock &DestBB,
                                       MachineBasicBlock &RestoreBB,
                                       const DebugLoc &DL, int64_t BrOffset,
                                       RegScavenger *RS) const {
  assert(RS && "RegScavenger required for long branching");
  assert(MBB.empty() &&
         "new block should be inserted for expanding unconditional branch");
  assert(MBB.pred_size() == 1);
  assert(RestoreBB.empty() &&
         "restore block should be inserted for restoring clobbered registers");
 
  MachineFunction *MF = MBB.getParent();
  MachineRegisterInfo &MRI = MF->getRegInfo();
 
  // FIXME: Virtual register workaround for RegScavenger not working with empty
  // blocks.
  Register PCReg = MRI.createVirtualRegister(&AMDGPU::SReg_64RegClass);
 
  auto I = MBB.end();
 
  // We need to compute the offset relative to the instruction immediately after
  // s_getpc_b64. Insert pc arithmetic code before last terminator.
  MachineInstr *GetPC = BuildMI(MBB, I, DL, get(AMDGPU::S_GETPC_B64), PCReg);
 
  auto &MCCtx = MF->getContext();
  MCSymbol *PostGetPCLabel =
      MCCtx.createTempSymbol("post_getpc", /*AlwaysAddSuffix=*/true);
  GetPC->setPostInstrSymbol(*MF, PostGetPCLabel);
 
  MCSymbol *OffsetLo =
      MCCtx.createTempSymbol("offset_lo", /*AlwaysAddSuffix=*/true);
  MCSymbol *OffsetHi =
      MCCtx.createTempSymbol("offset_hi", /*AlwaysAddSuffix=*/true);
  BuildMI(MBB, I, DL, get(AMDGPU::S_ADD_U32))
      .addReg(PCReg, RegState::Define, AMDGPU::sub0)
      .addReg(PCReg, 0, AMDGPU::sub0)
      .addSym(OffsetLo, MO_FAR_BRANCH_OFFSET);
  BuildMI(MBB, I, DL, get(AMDGPU::S_ADDC_U32))
      .addReg(PCReg, RegState::Define, AMDGPU::sub1)
      .addReg(PCReg, 0, AMDGPU::sub1)
      .addSym(OffsetHi, MO_FAR_BRANCH_OFFSET);
 
  // Insert the indirect branch after the other terminator.
  BuildMI(&MBB, DL, get(AMDGPU::S_SETPC_B64))
    .addReg(PCReg);
 
  // FIXME: If spilling is necessary, this will fail because this scavenger has
  // no emergency stack slots. It is non-trivial to spill in this situation,
  // because the restore code needs to be specially placed after the
  // jump. BranchRelaxation then needs to be made aware of the newly inserted
  // block.
  //
  // If a spill is needed for the pc register pair, we need to insert a spill
  // restore block right before the destination block, and insert a short branch
  // into the old destination block's fallthrough predecessor.
  // e.g.:
  //
  // s_cbranch_scc0 skip_long_branch:
  //
  // long_branch_bb:
  //   spill s[8:9]
  //   s_getpc_b64 s[8:9]
  //   s_add_u32 s8, s8, restore_bb
  //   s_addc_u32 s9, s9, 0
  //   s_setpc_b64 s[8:9]
  //
  // skip_long_branch:
  //   foo;
  //
  // .....
  //
  // dest_bb_fallthrough_predecessor:
  // bar;
  // s_branch dest_bb
  //
  // restore_bb:
  //  restore s[8:9]
  //  fallthrough dest_bb
  ///
  // dest_bb:
  //   buzz;
 
  RS->enterBasicBlockEnd(MBB);
  Register Scav = RS->scavengeRegisterBackwards(
      AMDGPU::SReg_64RegClass, MachineBasicBlock::iterator(GetPC),
      /* RestoreAfter */ false, 0, /* AllowSpill */ false);
  if (Scav) {
    RS->setRegUsed(Scav);
    MRI.replaceRegWith(PCReg, Scav);
    MRI.clearVirtRegs();
  } else {
    // As SGPR needs VGPR to be spilled, we reuse the slot of temporary VGPR for
    // SGPR spill.
    const GCNSubtarget &ST = MF->getSubtarget<GCNSubtarget>();
    const SIRegisterInfo *TRI = ST.getRegisterInfo();
    TRI->spillEmergencySGPR(GetPC, RestoreBB, AMDGPU::SGPR0_SGPR1, RS);
    MRI.replaceRegWith(PCReg, AMDGPU::SGPR0_SGPR1);
    MRI.clearVirtRegs();
  }
 
  MCSymbol *DestLabel = Scav ? DestBB.getSymbol() : RestoreBB.getSymbol();
  // Now, the distance could be defined.
  auto *Offset = MCBinaryExpr::createSub(
      MCSymbolRefExpr::create(DestLabel, MCCtx),
      MCSymbolRefExpr::create(PostGetPCLabel, MCCtx), MCCtx);
  // Add offset assignments.
  auto *Mask = MCConstantExpr::create(0xFFFFFFFFULL, MCCtx);
  OffsetLo->setVariableValue(MCBinaryExpr::createAnd(Offset, Mask, MCCtx));
  auto *ShAmt = MCConstantExpr::create(32, MCCtx);
  OffsetHi->setVariableValue(MCBinaryExpr::createAShr(Offset, ShAmt, MCCtx));
}
 
unsigned SIInstrInfo::getBranchOpcode(SIInstrInfo::BranchPredicate Cond) {
  switch (Cond) {
  case SIInstrInfo::SCC_TRUE:
    return AMDGPU::S_CBRANCH_SCC1;
  case SIInstrInfo::SCC_FALSE:
    return AMDGPU::S_CBRANCH_SCC0;
  case SIInstrInfo::VCCNZ:
    return AMDGPU::S_CBRANCH_VCCNZ;
  case SIInstrInfo::VCCZ:
    return AMDGPU::S_CBRANCH_VCCZ;
  case SIInstrInfo::EXECNZ:
    return AMDGPU::S_CBRANCH_EXECNZ;
  case SIInstrInfo::EXECZ:
    return AMDGPU::S_CBRANCH_EXECZ;
  default:
    llvm_unreachable("invalid branch predicate");
  }
}
 
SIInstrInfo::BranchPredicate SIInstrInfo::getBranchPredicate(unsigned Opcode) {
  switch (Opcode) {
  case AMDGPU::S_CBRANCH_SCC0:
    return SCC_FALSE;
  case AMDGPU::S_CBRANCH_SCC1:
    return SCC_TRUE;
  case AMDGPU::S_CBRANCH_VCCNZ:
    return VCCNZ;
  case AMDGPU::S_CBRANCH_VCCZ:
    return VCCZ;
  case AMDGPU::S_CBRANCH_EXECNZ:
    return EXECNZ;
  case AMDGPU::S_CBRANCH_EXECZ:
    return EXECZ;
  default:
    return INVALID_BR;
  }
}
 
bool SIInstrInfo::analyzeBranchImpl(MachineBasicBlock &MBB,
                                    MachineBasicBlock::iterator I,
                                    MachineBasicBlock *&TBB,
                                    MachineBasicBlock *&FBB,
                                    SmallVectorImpl<MachineOperand> &Cond,
                                    bool AllowModify) const {
  if (I->getOpcode() == AMDGPU::S_BRANCH) {
    // Unconditional Branch
    TBB = I->getOperand(0).getMBB();
    return false;
  }
 
  MachineBasicBlock *CondBB = nullptr;
 
  if (I->getOpcode() == AMDGPU::SI_NON_UNIFORM_BRCOND_PSEUDO) {
    CondBB = I->getOperand(1).getMBB();
    Cond.push_back(I->getOperand(0));
  } else {
    BranchPredicate Pred = getBranchPredicate(I->getOpcode());
    if (Pred == INVALID_BR)
      return true;
 
    CondBB = I->getOperand(0).getMBB();
    Cond.push_back(MachineOperand::CreateImm(Pred));
    Cond.push_back(I->getOperand(1)); // Save the branch register.
  }
  ++I;
 
  if (I == MBB.end()) {
    // Conditional branch followed by fall-through.
    TBB = CondBB;
    return false;
  }
 
  if (I->getOpcode() == AMDGPU::S_BRANCH) {
    TBB = CondBB;
    FBB = I->getOperand(0).getMBB();
    return false;
  }
 
  return true;
}
 
bool SIInstrInfo::analyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
                                MachineBasicBlock *&FBB,
                                SmallVectorImpl<MachineOperand> &Cond,
                                bool AllowModify) const {
  MachineBasicBlock::iterator I = MBB.getFirstTerminator();
  auto E = MBB.end();
  if (I == E)
    return false;
 
  // Skip over the instructions that are artificially terminators for special
  // exec management.
  while (I != E && !I->isBranch() && !I->isReturn()) {
    switch (I->getOpcode()) {
    case AMDGPU::S_MOV_B64_term:
    case AMDGPU::S_XOR_B64_term:
    case AMDGPU::S_OR_B64_term:
    case AMDGPU::S_ANDN2_B64_term:
    case AMDGPU::S_AND_B64_term:
    case AMDGPU::S_MOV_B32_term:
    case AMDGPU::S_XOR_B32_term:
    case AMDGPU::S_OR_B32_term:
    case AMDGPU::S_ANDN2_B32_term:
    case AMDGPU::S_AND_B32_term:
      break;
    case AMDGPU::SI_IF:
    case AMDGPU::SI_ELSE:
    case AMDGPU::SI_KILL_I1_TERMINATOR:
    case AMDGPU::SI_KILL_F32_COND_IMM_TERMINATOR:
      // FIXME: It's messy that these need to be considered here at all.
      return true;
    default:
      llvm_unreachable("unexpected non-branch terminator inst");
    }
 
    ++I;
  }
 
  if (I == E)
    return false;
 
  return analyzeBranchImpl(MBB, I, TBB, FBB, Cond, AllowModify);
}
 
unsigned SIInstrInfo::removeBranch(MachineBasicBlock &MBB,
                                   int *BytesRemoved) const {
  unsigned Count = 0;
  unsigned RemovedSize = 0;
  for (MachineInstr &MI : llvm::make_early_inc_range(MBB.terminators())) {
    // Skip over artificial terminators when removing instructions.
    if (MI.isBranch() || MI.isReturn()) {
      RemovedSize += getInstSizeInBytes(MI);
      MI.eraseFromParent();
      ++Count;
    }
  }
 
  if (BytesRemoved)
    *BytesRemoved = RemovedSize;
 
  return Count;
}
 
// Copy the flags onto the implicit condition register operand.
static void preserveCondRegFlags(MachineOperand &CondReg,
                                 const MachineOperand &OrigCond) {
  CondReg.setIsUndef(OrigCond.isUndef());
  CondReg.setIsKill(OrigCond.isKill());
}
 
unsigned SIInstrInfo::insertBranch(MachineBasicBlock &MBB,
                                   MachineBasicBlock *TBB,
                                   MachineBasicBlock *FBB,
                                   ArrayRef<MachineOperand> Cond,
                                   const DebugLoc &DL,
                                   int *BytesAdded) const {
  if (!FBB && Cond.empty()) {
    BuildMI(&MBB, DL, get(AMDGPU::S_BRANCH))
      .addMBB(TBB);
    if (BytesAdded)
      *BytesAdded = ST.hasOffset3fBug() ? 8 : 4;
    return 1;
  }
 
  if(Cond.size() == 1 && Cond[0].isReg()) {
     BuildMI(&MBB, DL, get(AMDGPU::SI_NON_UNIFORM_BRCOND_PSEUDO))
       .add(Cond[0])
       .addMBB(TBB);
     return 1;
  }
 
  assert(TBB && Cond[0].isImm());
 
  unsigned Opcode
    = getBranchOpcode(static_cast<BranchPredicate>(Cond[0].getImm()));
 
  if (!FBB) {
    Cond[1].isUndef();
    MachineInstr *CondBr =
      BuildMI(&MBB, DL, get(Opcode))
      .addMBB(TBB);
 
    // Copy the flags onto the implicit condition register operand.
    preserveCondRegFlags(CondBr->getOperand(1), Cond[1]);
    fixImplicitOperands(*CondBr);
 
    if (BytesAdded)
      *BytesAdded = ST.hasOffset3fBug() ? 8 : 4;
    return 1;
  }
 
  assert(TBB && FBB);
 
  MachineInstr *CondBr =
    BuildMI(&MBB, DL, get(Opcode))
    .addMBB(TBB);
  fixImplicitOperands(*CondBr);
  BuildMI(&MBB, DL, get(AMDGPU::S_BRANCH))
    .addMBB(FBB);
 
  MachineOperand &CondReg = CondBr->getOperand(1);
  CondReg.setIsUndef(Cond[1].isUndef());
  CondReg.setIsKill(Cond[1].isKill());
 
  if (BytesAdded)
    *BytesAdded = ST.hasOffset3fBug() ? 16 : 8;
 
  return 2;
}
 
bool SIInstrInfo::reverseBranchCondition(
  SmallVectorImpl<MachineOperand> &Cond) const {
  if (Cond.size() != 2) {
    return true;
  }
 
  if (Cond[0].isImm()) {
    Cond[0].setImm(-Cond[0].getImm());
    return false;
  }
 
  return true;
}
 
bool SIInstrInfo::canInsertSelect(const MachineBasicBlock &MBB,
                                  ArrayRef<MachineOperand> Cond,
                                  Register DstReg, Register TrueReg,
                                  Register FalseReg, int &CondCycles,
                                  int &TrueCycles, int &FalseCycles) const {
  switch (Cond[0].getImm()) {
  case VCCNZ:
  case VCCZ: {
    const MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
    const TargetRegisterClass *RC = MRI.getRegClass(TrueReg);
    if (MRI.getRegClass(FalseReg) != RC)
      return false;
 
    int NumInsts = AMDGPU::getRegBitWidth(RC->getID()) / 32;
    CondCycles = TrueCycles = FalseCycles = NumInsts; // ???
 
    // Limit to equal cost for branch vs. N v_cndmask_b32s.
    return RI.hasVGPRs(RC) && NumInsts <= 6;
  }
  case SCC_TRUE:
  case SCC_FALSE: {
    // FIXME: We could insert for VGPRs if we could replace the original compare
    // with a vector one.
    const MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
    const TargetRegisterClass *RC = MRI.getRegClass(TrueReg);
    if (MRI.getRegClass(FalseReg) != RC)
      return false;
 
    int NumInsts = AMDGPU::getRegBitWidth(RC->getID()) / 32;
 
    // Multiples of 8 can do s_cselect_b64
    if (NumInsts % 2 == 0)
      NumInsts /= 2;
 
    CondCycles = TrueCycles = FalseCycles = NumInsts; // ???
    return RI.isSGPRClass(RC);
  }
  default:
    return false;
  }
}
 
void SIInstrInfo::insertSelect(MachineBasicBlock &MBB,
                               MachineBasicBlock::iterator I, const DebugLoc &DL,
                               Register DstReg, ArrayRef<MachineOperand> Cond,
                               Register TrueReg, Register FalseReg) const {
  BranchPredicate Pred = static_cast<BranchPredicate>(Cond[0].getImm());
  if (Pred == VCCZ || Pred == SCC_FALSE) {
    Pred = static_cast<BranchPredicate>(-Pred);
    std::swap(TrueReg, FalseReg);
  }
 
  MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
  const TargetRegisterClass *DstRC = MRI.getRegClass(DstReg);
  unsigned DstSize = RI.getRegSizeInBits(*DstRC);
 
  if (DstSize == 32) {
    MachineInstr *Select;
    if (Pred == SCC_TRUE) {
      Select = BuildMI(MBB, I, DL, get(AMDGPU::S_CSELECT_B32), DstReg)
        .addReg(TrueReg)
        .addReg(FalseReg);
    } else {
      // Instruction's operands are backwards from what is expected.
      Select = BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e32), DstReg)
        .addReg(FalseReg)
        .addReg(TrueReg);
    }
 
    preserveCondRegFlags(Select->getOperand(3), Cond[1]);
    return;
  }
 
  if (DstSize == 64 && Pred == SCC_TRUE) {
    MachineInstr *Select =
      BuildMI(MBB, I, DL, get(AMDGPU::S_CSELECT_B64), DstReg)
      .addReg(TrueReg)
      .addReg(FalseReg);
 
    preserveCondRegFlags(Select->getOperand(3), Cond[1]);
    return;
  }
 
  static const int16_t Sub0_15[] = {
    AMDGPU::sub0, AMDGPU::sub1, AMDGPU::sub2, AMDGPU::sub3,
    AMDGPU::sub4, AMDGPU::sub5, AMDGPU::sub6, AMDGPU::sub7,
    AMDGPU::sub8, AMDGPU::sub9, AMDGPU::sub10, AMDGPU::sub11,
    AMDGPU::sub12, AMDGPU::sub13, AMDGPU::sub14, AMDGPU::sub15,
  };
 
  static const int16_t Sub0_15_64[] = {
    AMDGPU::sub0_sub1, AMDGPU::sub2_sub3,
    AMDGPU::sub4_sub5, AMDGPU::sub6_sub7,
    AMDGPU::sub8_sub9, AMDGPU::sub10_sub11,
    AMDGPU::sub12_sub13, AMDGPU::sub14_sub15,
  };
 
  unsigned SelOp = AMDGPU::V_CNDMASK_B32_e32;
  const TargetRegisterClass *EltRC = &AMDGPU::VGPR_32RegClass;
  const int16_t *SubIndices = Sub0_15;
  int NElts = DstSize / 32;
 
  // 64-bit select is only available for SALU.
  // TODO: Split 96-bit into 64-bit and 32-bit, not 3x 32-bit.
  if (Pred == SCC_TRUE) {
    if (NElts % 2) {
      SelOp = AMDGPU::S_CSELECT_B32;
      EltRC = &AMDGPU::SGPR_32RegClass;
    } else {
      SelOp = AMDGPU::S_CSELECT_B64;
      EltRC = &AMDGPU::SGPR_64RegClass;
      SubIndices = Sub0_15_64;
      NElts /= 2;
    }
  }
 
  MachineInstrBuilder MIB = BuildMI(
    MBB, I, DL, get(AMDGPU::REG_SEQUENCE), DstReg);
 
  I = MIB->getIterator();
 
  SmallVector<Register, 8> Regs;
  for (int Idx = 0; Idx != NElts; ++Idx) {
    Register DstElt = MRI.createVirtualRegister(EltRC);
    Regs.push_back(DstElt);
 
    unsigned SubIdx = SubIndices[Idx];
 
    MachineInstr *Select;
    if (SelOp == AMDGPU::V_CNDMASK_B32_e32) {
      Select =
        BuildMI(MBB, I, DL, get(SelOp), DstElt)
        .addReg(FalseReg, 0, SubIdx)
        .addReg(TrueReg, 0, SubIdx);
    } else {
      Select =
        BuildMI(MBB, I, DL, get(SelOp), DstElt)
        .addReg(TrueReg, 0, SubIdx)
        .addReg(FalseReg, 0, SubIdx);
    }
 
    preserveCondRegFlags(Select->getOperand(3), Cond[1]);
    fixImplicitOperands(*Select);
 
    MIB.addReg(DstElt)
       .addImm(SubIdx);
  }
}
 
bool SIInstrInfo::isFoldableCopy(const MachineInstr &MI) {
  switch (MI.getOpcode()) {
  case AMDGPU::V_MOV_B32_e32:
  case AMDGPU::V_MOV_B32_e64:
  case AMDGPU::V_MOV_B64_PSEUDO:
  case AMDGPU::V_MOV_B64_e32:
  case AMDGPU::V_MOV_B64_e64:
  case AMDGPU::S_MOV_B32:
  case AMDGPU::S_MOV_B64:
  case AMDGPU::COPY:
  case AMDGPU::V_ACCVGPR_WRITE_B32_e64:
  case AMDGPU::V_ACCVGPR_READ_B32_e64:
  case AMDGPU::V_ACCVGPR_MOV_B32:
    return true;
  default:
    return false;
  }
}
 
static constexpr unsigned ModifierOpNames[] = {
    AMDGPU::OpName::src0_modifiers, AMDGPU::OpName::src1_modifiers,
    AMDGPU::OpName::src2_modifiers, AMDGPU::OpName::clamp,
    AMDGPU::OpName::omod};
 
void SIInstrInfo::removeModOperands(MachineInstr &MI) const {
  unsigned Opc = MI.getOpcode();
  for (unsigned Name : reverse(ModifierOpNames))
    MI.removeOperand(AMDGPU::getNamedOperandIdx(Opc, Name));
}
 
bool SIInstrInfo::FoldImmediate(MachineInstr &UseMI, MachineInstr &DefMI,
                                Register Reg, MachineRegisterInfo *MRI) const {
  if (!MRI->hasOneNonDBGUse(Reg))
    return false;
 
  switch (DefMI.getOpcode()) {
  default:
    return false;
  case AMDGPU::S_MOV_B64:
    // TODO: We could fold 64-bit immediates, but this get complicated
    // when there are sub-registers.
    return false;
 
  case AMDGPU::V_MOV_B32_e32:
  case AMDGPU::S_MOV_B32:
  case AMDGPU::V_ACCVGPR_WRITE_B32_e64:
    break;
  }
 
  const MachineOperand *ImmOp = getNamedOperand(DefMI, AMDGPU::OpName::src0);
  assert(ImmOp);
  // FIXME: We could handle FrameIndex values here.
  if (!ImmOp->isImm())
    return false;
 
  unsigned Opc = UseMI.getOpcode();
  if (Opc == AMDGPU::COPY) {
    Register DstReg = UseMI.getOperand(0).getReg();
    bool Is16Bit = getOpSize(UseMI, 0) == 2;
    bool isVGPRCopy = RI.isVGPR(*MRI, DstReg);
    unsigned NewOpc = isVGPRCopy ? AMDGPU::V_MOV_B32_e32 : AMDGPU::S_MOV_B32;
    APInt Imm(32, ImmOp->getImm());
 
    if (UseMI.getOperand(1).getSubReg() == AMDGPU::hi16)
      Imm = Imm.ashr(16);
 
    if (RI.isAGPR(*MRI, DstReg)) {
      if (!isInlineConstant(Imm))
        return false;
      NewOpc = AMDGPU::V_ACCVGPR_WRITE_B32_e64;
    }
 
    if (Is16Bit) {
      if (isVGPRCopy)
        return false; // Do not clobber vgpr_hi16
 
      if (DstReg.isVirtual() && UseMI.getOperand(0).getSubReg() != AMDGPU::lo16)
        return false;
 
      UseMI.getOperand(0).setSubReg(0);
      if (DstReg.isPhysical()) {
        DstReg = RI.get32BitRegister(DstReg);
        UseMI.getOperand(0).setReg(DstReg);
      }
      assert(UseMI.getOperand(1).getReg().isVirtual());
    }
 
    UseMI.setDesc(get(NewOpc));
    UseMI.getOperand(1).ChangeToImmediate(Imm.getSExtValue());
    UseMI.addImplicitDefUseOperands(*UseMI.getParent()->getParent());
    return true;
  }
 
  if (Opc == AMDGPU::V_MAD_F32_e64 || Opc == AMDGPU::V_MAC_F32_e64 ||
      Opc == AMDGPU::V_MAD_F16_e64 || Opc == AMDGPU::V_MAC_F16_e64 ||
      Opc == AMDGPU::V_FMA_F32_e64 || Opc == AMDGPU::V_FMAC_F32_e64 ||
      Opc == AMDGPU::V_FMA_F16_e64 || Opc == AMDGPU::V_FMAC_F16_e64) {
    // Don't fold if we are using source or output modifiers. The new VOP2
    // instructions don't have them.
    if (hasAnyModifiersSet(UseMI))
      return false;
 
    // If this is a free constant, there's no reason to do this.
    // TODO: We could fold this here instead of letting SIFoldOperands do it
    // later.
    MachineOperand *Src0 = getNamedOperand(UseMI, AMDGPU::OpName::src0);
 
    // Any src operand can be used for the legality check.
    if (isInlineConstant(UseMI, *Src0, *ImmOp))
      return false;
 
    bool IsF32 = Opc == AMDGPU::V_MAD_F32_e64 || Opc == AMDGPU::V_MAC_F32_e64 ||
                 Opc == AMDGPU::V_FMA_F32_e64 || Opc == AMDGPU::V_FMAC_F32_e64;
    bool IsFMA = Opc == AMDGPU::V_FMA_F32_e64 || Opc == AMDGPU::V_FMAC_F32_e64 ||
                 Opc == AMDGPU::V_FMA_F16_e64 || Opc == AMDGPU::V_FMAC_F16_e64;
    MachineOperand *Src1 = getNamedOperand(UseMI, AMDGPU::OpName::src1);
    MachineOperand *Src2 = getNamedOperand(UseMI, AMDGPU::OpName::src2);
 
    // Multiplied part is the constant: Use v_madmk_{f16, f32}.
    // We should only expect these to be on src0 due to canonicalization.
    if (Src0->isReg() && Src0->getReg() == Reg) {
      if (!Src1->isReg() || RI.isSGPRClass(MRI->getRegClass(Src1->getReg())))
        return false;
 
      if (!Src2->isReg() || RI.isSGPRClass(MRI->getRegClass(Src2->getReg())))
        return false;
 
      unsigned NewOpc =
        IsFMA ? (IsF32 ? AMDGPU::V_FMAMK_F32 : AMDGPU::V_FMAMK_F16)
              : (IsF32 ? AMDGPU::V_MADMK_F32 : AMDGPU::V_MADMK_F16);
      if (pseudoToMCOpcode(NewOpc) == -1)
        return false;
 
      // We need to swap operands 0 and 1 since madmk constant is at operand 1.
 
      const int64_t Imm = ImmOp->getImm();
 
      // FIXME: This would be a lot easier if we could return a new instruction
      // instead of having to modify in place.
 
      Register Src1Reg = Src1->getReg();
      unsigned Src1SubReg = Src1->getSubReg();
      Src0->setReg(Src1Reg);
      Src0->setSubReg(Src1SubReg);
      Src0->setIsKill(Src1->isKill());
 
      if (Opc == AMDGPU::V_MAC_F32_e64 ||
          Opc == AMDGPU::V_MAC_F16_e64 ||
          Opc == AMDGPU::V_FMAC_F32_e64 ||
          Opc == AMDGPU::V_FMAC_F16_e64)
        UseMI.untieRegOperand(
            AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src2));
 
      Src1->ChangeToImmediate(Imm);
 
      removeModOperands(UseMI);
      UseMI.setDesc(get(NewOpc));
 
      bool DeleteDef = MRI->use_nodbg_empty(Reg);
      if (DeleteDef)
        DefMI.eraseFromParent();
 
      return true;
    }
 
    // Added part is the constant: Use v_madak_{f16, f32}.
    if (Src2->isReg() && Src2->getReg() == Reg) {
      // Not allowed to use constant bus for another operand.
      // We can however allow an inline immediate as src0.
      bool Src0Inlined = false;
      if (Src0->isReg()) {
        // Try to inline constant if possible.
        // If the Def moves immediate and the use is single
        // We are saving VGPR here.
        MachineInstr *Def = MRI->getUniqueVRegDef(Src0->getReg());
        if (Def && Def->isMoveImmediate() &&
          isInlineConstant(Def->getOperand(1)) &&
          MRI->hasOneUse(Src0->getReg())) {
          Src0->ChangeToImmediate(Def->getOperand(1).getImm());
          Src0Inlined = true;
        } else if ((Src0->getReg().isPhysical() &&
                    (ST.getConstantBusLimit(Opc) <= 1 &&
                     RI.isSGPRClass(RI.getPhysRegClass(Src0->getReg())))) ||
                   (Src0->getReg().isVirtual() &&
                    (ST.getConstantBusLimit(Opc) <= 1 &&
                     RI.isSGPRClass(MRI->getRegClass(Src0->getReg())))))
          return false;
          // VGPR is okay as Src0 - fallthrough
      }
 
      if (Src1->isReg() && !Src0Inlined ) {
        // We have one slot for inlinable constant so far - try to fill it
        MachineInstr *Def = MRI->getUniqueVRegDef(Src1->getReg());
        if (Def && Def->isMoveImmediate() &&
            isInlineConstant(Def->getOperand(1)) &&
            MRI->hasOneUse(Src1->getReg()) &&
            commuteInstruction(UseMI)) {
            Src0->ChangeToImmediate(Def->getOperand(1).getImm());
        } else if ((Src1->getReg().isPhysical() &&
                    RI.isSGPRClass(RI.getPhysRegClass(Src1->getReg()))) ||
                   (Src1->getReg().isVirtual() &&
                    RI.isSGPRClass(MRI->getRegClass(Src1->getReg()))))
          return false;
          // VGPR is okay as Src1 - fallthrough
      }
 
      unsigned NewOpc =
        IsFMA ? (IsF32 ? AMDGPU::V_FMAAK_F32 : AMDGPU::V_FMAAK_F16)
              : (IsF32 ? AMDGPU::V_MADAK_F32 : AMDGPU::V_MADAK_F16);
      if (pseudoToMCOpcode(NewOpc) == -1)
        return false;
 
      const int64_t Imm = ImmOp->getImm();
 
      // FIXME: This would be a lot easier if we could return a new instruction
      // instead of having to modify in place.
 
      if (Opc == AMDGPU::V_MAC_F32_e64 ||
          Opc == AMDGPU::V_MAC_F16_e64 ||
          Opc == AMDGPU::V_FMAC_F32_e64 ||
          Opc == AMDGPU::V_FMAC_F16_e64)
        UseMI.untieRegOperand(
            AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src2));
 
      // ChangingToImmediate adds Src2 back to the instruction.
      Src2->ChangeToImmediate(Imm);
 
      // These come before src2.
      removeModOperands(UseMI);
      UseMI.setDesc(get(NewOpc));
      // It might happen that UseMI was commuted
      // and we now have SGPR as SRC1. If so 2 inlined
      // constant and SGPR are illegal.
      legalizeOperands(UseMI);
 
      bool DeleteDef = MRI->use_nodbg_empty(Reg);
      if (DeleteDef)
        DefMI.eraseFromParent();
 
      return true;
    }
  }
 
  return false;
}
 
static bool
memOpsHaveSameBaseOperands(ArrayRef<const MachineOperand *> BaseOps1,
                           ArrayRef<const MachineOperand *> BaseOps2) {
  if (BaseOps1.size() != BaseOps2.size())
    return false;
  for (size_t I = 0, E = BaseOps1.size(); I < E; ++I) {
    if (!BaseOps1[I]->isIdenticalTo(*BaseOps2[I]))
      return false;
  }
  return true;
}
 
static bool offsetsDoNotOverlap(int WidthA, int OffsetA,
                                int WidthB, int OffsetB) {
  int LowOffset = OffsetA < OffsetB ? OffsetA : OffsetB;
  int HighOffset = OffsetA < OffsetB ? OffsetB : OffsetA;
  int LowWidth = (LowOffset == OffsetA) ? WidthA : WidthB;
  return LowOffset + LowWidth <= HighOffset;
}
 
bool SIInstrInfo::checkInstOffsetsDoNotOverlap(const MachineInstr &MIa,
                                               const MachineInstr &MIb) const {
  SmallVector<const MachineOperand *, 4> BaseOps0, BaseOps1;
  int64_t Offset0, Offset1;
  unsigned Dummy0, Dummy1;
  bool Offset0IsScalable, Offset1IsScalable;
  if (!getMemOperandsWithOffsetWidth(MIa, BaseOps0, Offset0, Offset0IsScalable,
                                     Dummy0, &RI) ||
      !getMemOperandsWithOffsetWidth(MIb, BaseOps1, Offset1, Offset1IsScalable,
                                     Dummy1, &RI))
    return false;
 
  if (!memOpsHaveSameBaseOperands(BaseOps0, BaseOps1))
    return false;
 
  if (!MIa.hasOneMemOperand() || !MIb.hasOneMemOperand()) {
    // FIXME: Handle ds_read2 / ds_write2.
    return false;
  }
  unsigned Width0 = MIa.memoperands().front()->getSize();
  unsigned Width1 = MIb.memoperands().front()->getSize();
  return offsetsDoNotOverlap(Width0, Offset0, Width1, Offset1);
}
 
bool SIInstrInfo::areMemAccessesTriviallyDisjoint(const MachineInstr &MIa,
                                                  const MachineInstr &MIb) const {
  assert(MIa.mayLoadOrStore() &&
         "MIa must load from or modify a memory location");
  assert(MIb.mayLoadOrStore() &&
         "MIb must load from or modify a memory location");
 
  if (MIa.hasUnmodeledSideEffects() || MIb.hasUnmodeledSideEffects())
    return false;
 
  // XXX - Can we relax this between address spaces?
  if (MIa.hasOrderedMemoryRef() || MIb.hasOrderedMemoryRef())
    return false;
 
  // TODO: Should we check the address space from the MachineMemOperand? That
  // would allow us to distinguish objects we know don't alias based on the
  // underlying address space, even if it was lowered to a different one,
  // e.g. private accesses lowered to use MUBUF instructions on a scratch
  // buffer.
  if (isDS(MIa)) {
    if (isDS(MIb))
      return checkInstOffsetsDoNotOverlap(MIa, MIb);
 
    return !isFLAT(MIb) || isSegmentSpecificFLAT(MIb);
  }
 
  if (isMUBUF(MIa) || isMTBUF(MIa)) {
    if (isMUBUF(MIb) || isMTBUF(MIb))
      return checkInstOffsetsDoNotOverlap(MIa, MIb);
 
    return !isFLAT(MIb) && !isSMRD(MIb);
  }
 
  if (isSMRD(MIa)) {
    if (isSMRD(MIb))
      return checkInstOffsetsDoNotOverlap(MIa, MIb);
 
    return !isFLAT(MIb) && !isMUBUF(MIb) && !isMTBUF(MIb);
  }
 
  if (isFLAT(MIa)) {
    if (isFLAT(MIb))
      return checkInstOffsetsDoNotOverlap(MIa, MIb);
 
    return false;
  }
 
  return false;
}
 
static bool getFoldableImm(Register Reg, const MachineRegisterInfo &MRI,
                           int64_t &Imm, MachineInstr **DefMI = nullptr) {
  if (Reg.isPhysical())
    return false;
  auto *Def = MRI.getUniqueVRegDef(Reg);
  if (Def && SIInstrInfo::isFoldableCopy(*Def) && Def->getOperand(1).isImm()) {
    Imm = Def->getOperand(1).getImm();
    if (DefMI)
      *DefMI = Def;
    return true;
  }
  return false;
}
 
static bool getFoldableImm(const MachineOperand *MO, int64_t &Imm,
                           MachineInstr **DefMI = nullptr) {
  if (!MO->isReg())
    return false;
  const MachineFunction *MF = MO->getParent()->getParent()->getParent();
  const MachineRegisterInfo &MRI = MF->getRegInfo();
  return getFoldableImm(MO->getReg(), MRI, Imm, DefMI);
}
 
static void updateLiveVariables(LiveVariables *LV, MachineInstr &MI,
                                MachineInstr &NewMI) {
  if (LV) {
    unsigned NumOps = MI.getNumOperands();
    for (unsigned I = 1; I < NumOps; ++I) {
      MachineOperand &Op = MI.getOperand(I);
      if (Op.isReg() && Op.isKill())
        LV->replaceKillInstruction(Op.getReg(), MI, NewMI);
    }
  }
}
 
MachineInstr *SIInstrInfo::convertToThreeAddress(MachineInstr &MI,
                                                 LiveVariables *LV,
                                                 LiveIntervals *LIS) const {
  MachineBasicBlock &MBB = *MI.getParent();
  unsigned Opc = MI.getOpcode();
 
  // Handle MFMA.
  int NewMFMAOpc = AMDGPU::getMFMAEarlyClobberOp(Opc);
  if (NewMFMAOpc != -1) {
    MachineInstrBuilder MIB =
        BuildMI(MBB, MI, MI.getDebugLoc(), get(NewMFMAOpc));
    for (unsigned I = 0, E = MI.getNumOperands(); I != E; ++I)
      MIB.add(MI.getOperand(I));
    updateLiveVariables(LV, MI, *MIB);
    if (LIS)
      LIS->ReplaceMachineInstrInMaps(MI, *MIB);
    return MIB;
  }
 
  if (SIInstrInfo::isWMMA(MI)) {
    unsigned NewOpc = AMDGPU::mapWMMA2AddrTo3AddrOpcode(MI.getOpcode());
    MachineInstrBuilder MIB = BuildMI(MBB, MI, MI.getDebugLoc(), get(NewOpc))
                                  .setMIFlags(MI.getFlags());
    for (unsigned I = 0, E = MI.getNumOperands(); I != E; ++I)
      MIB->addOperand(MI.getOperand(I));
 
    updateLiveVariables(LV, MI, *MIB);
    if (LIS)
      LIS->ReplaceMachineInstrInMaps(MI, *MIB);
 
    return MIB;
  }
 
  // Handle MAC/FMAC.
  bool IsF16 = Opc == AMDGPU::V_MAC_F16_e32 || Opc == AMDGPU::V_MAC_F16_e64 ||
               Opc == AMDGPU::V_FMAC_F16_e32 || Opc == AMDGPU::V_FMAC_F16_e64;
  bool IsFMA = Opc == AMDGPU::V_FMAC_F32_e32 || Opc == AMDGPU::V_FMAC_F32_e64 ||
               Opc == AMDGPU::V_FMAC_LEGACY_F32_e32 ||
               Opc == AMDGPU::V_FMAC_LEGACY_F32_e64 ||
               Opc == AMDGPU::V_FMAC_F16_e32 || Opc == AMDGPU::V_FMAC_F16_e64 ||
               Opc == AMDGPU::V_FMAC_F64_e32 || Opc == AMDGPU::V_FMAC_F64_e64;
  bool IsF64 = Opc == AMDGPU::V_FMAC_F64_e32 || Opc == AMDGPU::V_FMAC_F64_e64;
  bool IsLegacy = Opc == AMDGPU::V_MAC_LEGACY_F32_e32 ||
                  Opc == AMDGPU::V_MAC_LEGACY_F32_e64 ||
                  Opc == AMDGPU::V_FMAC_LEGACY_F32_e32 ||
                  Opc == AMDGPU::V_FMAC_LEGACY_F32_e64;
  bool Src0Literal = false;
 
  switch (Opc) {
  default:
    return nullptr;
  case AMDGPU::V_MAC_F16_e64:
  case AMDGPU::V_FMAC_F16_e64:
  case AMDGPU::V_MAC_F32_e64:
  case AMDGPU::V_MAC_LEGACY_F32_e64:
  case AMDGPU::V_FMAC_F32_e64:
  case AMDGPU::V_FMAC_LEGACY_F32_e64:
  case AMDGPU::V_FMAC_F64_e64:
    break;
  case AMDGPU::V_MAC_F16_e32:
  case AMDGPU::V_FMAC_F16_e32:
  case AMDGPU::V_MAC_F32_e32:
  case AMDGPU::V_MAC_LEGACY_F32_e32:
  case AMDGPU::V_FMAC_F32_e32:
  case AMDGPU::V_FMAC_LEGACY_F32_e32:
  case AMDGPU::V_FMAC_F64_e32: {
    int Src0Idx = AMDGPU::getNamedOperandIdx(MI.getOpcode(),
                                             AMDGPU::OpName::src0);
    const MachineOperand *Src0 = &MI.getOperand(Src0Idx);
    if (!Src0->isReg() && !Src0->isImm())
      return nullptr;
 
    if (Src0->isImm() && !isInlineConstant(MI, Src0Idx, *Src0))
      Src0Literal = true;
 
    break;
  }
  }
 
  MachineInstrBuilder MIB;
  const MachineOperand *Dst = getNamedOperand(MI, AMDGPU::OpName::vdst);
  const MachineOperand *Src0 = getNamedOperand(MI, AMDGPU::OpName::src0);
  const MachineOperand *Src0Mods =
    getNamedOperand(MI, AMDGPU::OpName::src0_modifiers);
  const MachineOperand *Src1 = getNamedOperand(MI, AMDGPU::OpName::src1);
  const MachineOperand *Src1Mods =
    getNamedOperand(MI, AMDGPU::OpName::src1_modifiers);
  const MachineOperand *Src2 = getNamedOperand(MI, AMDGPU::OpName::src2);
  const MachineOperand *Src2Mods =
      getNamedOperand(MI, AMDGPU::OpName::src2_modifiers);
  const MachineOperand *Clamp = getNamedOperand(MI, AMDGPU::OpName::clamp);
  const MachineOperand *Omod = getNamedOperand(MI, AMDGPU::OpName::omod);
 
  if (!Src0Mods && !Src1Mods && !Src2Mods && !Clamp && !Omod && !IsF64 &&
      !IsLegacy &&
      // If we have an SGPR input, we will violate the constant bus restriction.
      (ST.getConstantBusLimit(Opc) > 1 || !Src0->isReg() ||
       !RI.isSGPRReg(MBB.getParent()->getRegInfo(), Src0->getReg()))) {
    MachineInstr *DefMI;
    const auto killDef = [&]() -> void {
      const MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
      // The only user is the instruction which will be killed.
      Register DefReg = DefMI->getOperand(0).getReg();
      if (!MRI.hasOneNonDBGUse(DefReg))
        return;
      // We cannot just remove the DefMI here, calling pass will crash.
      DefMI->setDesc(get(AMDGPU::IMPLICIT_DEF));
      for (unsigned I = DefMI->getNumOperands() - 1; I != 0; --I)
        DefMI->removeOperand(I);
      if (LV)
        LV->getVarInfo(DefReg).AliveBlocks.clear();
    };
 
    int64_t Imm;
    if (!Src0Literal && getFoldableImm(Src2, Imm, &DefMI)) {
      unsigned NewOpc =
          IsFMA ? (IsF16 ? AMDGPU::V_FMAAK_F16 : AMDGPU::V_FMAAK_F32)
                : (IsF16 ? AMDGPU::V_MADAK_F16 : AMDGPU::V_MADAK_F32);
      if (pseudoToMCOpcode(NewOpc) != -1) {
        MIB = BuildMI(MBB, MI, MI.getDebugLoc(), get(NewOpc))
                  .add(*Dst)
                  .add(*Src0)
                  .add(*Src1)
                  .addImm(Imm);
        updateLiveVariables(LV, MI, *MIB);
        if (LIS)
          LIS->ReplaceMachineInstrInMaps(MI, *MIB);
        killDef();
        return MIB;
      }
    }
    unsigned NewOpc = IsFMA
                          ? (IsF16 ? AMDGPU::V_FMAMK_F16 : AMDGPU::V_FMAMK_F32)
                          : (IsF16 ? AMDGPU::V_MADMK_F16 : AMDGPU::V_MADMK_F32);
    if (!Src0Literal && getFoldableImm(Src1, Imm, &DefMI)) {
      if (pseudoToMCOpcode(NewOpc) != -1) {
        MIB = BuildMI(MBB, MI, MI.getDebugLoc(), get(NewOpc))
                  .add(*Dst)
                  .add(*Src0)
                  .addImm(Imm)
                  .add(*Src2);
        updateLiveVariables(LV, MI, *MIB);
        if (LIS)
          LIS->ReplaceMachineInstrInMaps(MI, *MIB);
        killDef();
        return MIB;
      }
    }
    if (Src0Literal || getFoldableImm(Src0, Imm, &DefMI)) {
      if (Src0Literal) {
        Imm = Src0->getImm();
        DefMI = nullptr;
      }
      if (pseudoToMCOpcode(NewOpc) != -1 &&
          isOperandLegal(
              MI, AMDGPU::getNamedOperandIdx(NewOpc, AMDGPU::OpName::src0),
              Src1)) {
        MIB = BuildMI(MBB, MI, MI.getDebugLoc(), get(NewOpc))
                  .add(*Dst)
                  .add(*Src1)
                  .addImm(Imm)
                  .add(*Src2);
        updateLiveVariables(LV, MI, *MIB);
        if (LIS)
          LIS->ReplaceMachineInstrInMaps(MI, *MIB);
        if (DefMI)
          killDef();
        return MIB;
      }
    }
  }
 
  // VOP2 mac/fmac with a literal operand cannot be converted to VOP3 mad/fma
  // because VOP3 does not allow a literal operand.
  // TODO: Remove this restriction for GFX10.
  if (Src0Literal)
    return nullptr;
 
  unsigned NewOpc = IsFMA ? IsF16 ? AMDGPU::V_FMA_F16_gfx9_e64
                                  : IsF64 ? AMDGPU::V_FMA_F64_e64
                                          : IsLegacy
                                                ? AMDGPU::V_FMA_LEGACY_F32_e64
                                                : AMDGPU::V_FMA_F32_e64
                          : IsF16 ? AMDGPU::V_MAD_F16_e64
                                  : IsLegacy ? AMDGPU::V_MAD_LEGACY_F32_e64
                                             : AMDGPU::V_MAD_F32_e64;
  if (pseudoToMCOpcode(NewOpc) == -1)
    return nullptr;
 
  MIB = BuildMI(MBB, MI, MI.getDebugLoc(), get(NewOpc))
            .add(*Dst)
            .addImm(Src0Mods ? Src0Mods->getImm() : 0)
            .add(*Src0)
            .addImm(Src1Mods ? Src1Mods->getImm() : 0)
            .add(*Src1)
            .addImm(Src2Mods ? Src2Mods->getImm() : 0)
            .add(*Src2)
            .addImm(Clamp ? Clamp->getImm() : 0)
            .addImm(Omod ? Omod->getImm() : 0);
  updateLiveVariables(LV, MI, *MIB);
  if (LIS)
    LIS->ReplaceMachineInstrInMaps(MI, *MIB);
  return MIB;
}
 
// It's not generally safe to move VALU instructions across these since it will
// start using the register as a base index rather than directly.
// XXX - Why isn't hasSideEffects sufficient for these?
static bool changesVGPRIndexingMode(const MachineInstr &MI) {
  switch (MI.getOpcode()) {
  case AMDGPU::S_SET_GPR_IDX_ON:
  case AMDGPU::S_SET_GPR_IDX_MODE:
  case AMDGPU::S_SET_GPR_IDX_OFF:
    return true;
  default:
    return false;
  }
}
 
bool SIInstrInfo::isSchedulingBoundary(const MachineInstr &MI,
                                       const MachineBasicBlock *MBB,
                                       const MachineFunction &MF) const {
  // Skipping the check for SP writes in the base implementation. The reason it
  // was added was apparently due to compile time concerns.
  //
  // TODO: Do we really want this barrier? It triggers unnecessary hazard nops
  // but is probably avoidable.
 
  // Copied from base implementation.
  // Terminators and labels can't be scheduled around.
  if (MI.isTerminator() || MI.isPosition())
    return true;
 
  // INLINEASM_BR can jump to another block
  if (MI.getOpcode() == TargetOpcode::INLINEASM_BR)
    return true;
 
  if (MI.getOpcode() == AMDGPU::SCHED_BARRIER && MI.getOperand(0).getImm() == 0)
    return true;
 
  // Target-independent instructions do not have an implicit-use of EXEC, even
  // when they operate on VGPRs. Treating EXEC modifications as scheduling
  // boundaries prevents incorrect movements of such instructions.
  return MI.modifiesRegister(AMDGPU::EXEC, &RI) ||
         MI.getOpcode() == AMDGPU::S_SETREG_IMM32_B32 ||
         MI.getOpcode() == AMDGPU::S_SETREG_B32 ||
         changesVGPRIndexingMode(MI);
}
 
bool SIInstrInfo::isAlwaysGDS(uint16_t Opcode) const {
  return Opcode == AMDGPU::DS_ORDERED_COUNT ||
         Opcode == AMDGPU::DS_GWS_INIT ||
         Opcode == AMDGPU::DS_GWS_SEMA_V ||
         Opcode == AMDGPU::DS_GWS_SEMA_BR ||
         Opcode == AMDGPU::DS_GWS_SEMA_P ||
         Opcode == AMDGPU::DS_GWS_SEMA_RELEASE_ALL ||
         Opcode == AMDGPU::DS_GWS_BARRIER;
}
 
bool SIInstrInfo::modifiesModeRegister(const MachineInstr &MI) {
  // Skip the full operand and register alias search modifiesRegister
  // does. There's only a handful of instructions that touch this, it's only an
  // implicit def, and doesn't alias any other registers.
  if (const MCPhysReg *ImpDef = MI.getDesc().getImplicitDefs()) {
    for (; ImpDef && *ImpDef; ++ImpDef) {
      if (*ImpDef == AMDGPU::MODE)
        return true;
    }
  }
 
  return false;
}
 
bool SIInstrInfo::hasUnwantedEffectsWhenEXECEmpty(const MachineInstr &MI) const {
  unsigned Opcode = MI.getOpcode();
 
  if (MI.mayStore() && isSMRD(MI))
    return true; // scalar store or atomic
 
  // This will terminate the function when other lanes may need to continue.
  if (MI.isReturn())
    return true;
 
  // These instructions cause shader I/O that may cause hardware lockups
  // when executed with an empty EXEC mask.
  //
  // Note: exp with VM = DONE = 0 is automatically skipped by hardware when
  //       EXEC = 0, but checking for that case here seems not worth it
  //       given the typical code patterns.
  if (Opcode == AMDGPU::S_SENDMSG || Opcode == AMDGPU::S_SENDMSGHALT ||
      isEXP(Opcode) ||
      Opcode == AMDGPU::DS_ORDERED_COUNT || Opcode == AMDGPU::S_TRAP ||
      Opcode == AMDGPU::DS_GWS_INIT || Opcode == AMDGPU::DS_GWS_BARRIER)
    return true;
 
  if (MI.isCall() || MI.isInlineAsm())
    return true; // conservative assumption
 
  // A mode change is a scalar operation that influences vector instructions.
  if (modifiesModeRegister(MI))
    return true;
 
  // These are like SALU instructions in terms of effects, so it's questionable
  // whether we should return true for those.
  //
  // However, executing them with EXEC = 0 causes them to operate on undefined
  // data, which we avoid by returning true here.
  if (Opcode == AMDGPU::V_READFIRSTLANE_B32 ||
      Opcode == AMDGPU::V_READLANE_B32 || Opcode == AMDGPU::V_WRITELANE_B32)
    return true;
 
  return false;
}
 
bool SIInstrInfo::mayReadEXEC(const MachineRegisterInfo &MRI,
                              const MachineInstr &MI) const {
  if (MI.isMetaInstruction())
    return false;
 
  // This won't read exec if this is an SGPR->SGPR copy.
  if (MI.isCopyLike()) {
    if (!RI.isSGPRReg(MRI, MI.getOperand(0).getReg()))
      return true;
 
    // Make sure this isn't copying exec as a normal operand
    return MI.readsRegister(AMDGPU::EXEC, &RI);
  }
 
  // Make a conservative assumption about the callee.
  if (MI.isCall())
    return true;
 
  // Be conservative with any unhandled generic opcodes.
  if (!isTargetSpecificOpcode(MI.getOpcode()))
    return true;
 
  return !isSALU(MI) || MI.readsRegister(AMDGPU::EXEC, &RI);
}
 
bool SIInstrInfo::isInlineConstant(const APInt &Imm) const {
  switch (Imm.getBitWidth()) {
  case 1: // This likely will be a condition code mask.
    return true;
 
  case 32:
    return AMDGPU::isInlinableLiteral32(Imm.getSExtValue(),
                                        ST.hasInv2PiInlineImm());
  case 64:
    return AMDGPU::isInlinableLiteral64(Imm.getSExtValue(),
                                        ST.hasInv2PiInlineImm());
  case 16:
    return ST.has16BitInsts() &&
           AMDGPU::isInlinableLiteral16(Imm.getSExtValue(),
                                        ST.hasInv2PiInlineImm());
  default:
    llvm_unreachable("invalid bitwidth");
  }
}
 
bool SIInstrInfo::isInlineConstant(const MachineOperand &MO,
                                   uint8_t OperandType) const {
  if (!MO.isImm() ||
      OperandType < AMDGPU::OPERAND_SRC_FIRST ||
      OperandType > AMDGPU::OPERAND_SRC_LAST)
    return false;
 
  // MachineOperand provides no way to tell the true operand size, since it only
  // records a 64-bit value. We need to know the size to determine if a 32-bit
  // floating point immediate bit pattern is legal for an integer immediate. It
  // would be for any 32-bit integer operand, but would not be for a 64-bit one.
 
  int64_t Imm = MO.getImm();
  switch (OperandType) {
  case AMDGPU::OPERAND_REG_IMM_INT32:
  case AMDGPU::OPERAND_REG_IMM_FP32:
  case AMDGPU::OPERAND_REG_IMM_FP32_DEFERRED:
  case AMDGPU::OPERAND_REG_INLINE_C_INT32:
  case AMDGPU::OPERAND_REG_INLINE_C_FP32:
  case AMDGPU::OPERAND_REG_IMM_V2FP32:
  case AMDGPU::OPERAND_REG_INLINE_C_V2FP32:
  case AMDGPU::OPERAND_REG_IMM_V2INT32:
  case AMDGPU::OPERAND_REG_INLINE_C_V2INT32:
  case AMDGPU::OPERAND_REG_INLINE_AC_INT32:
  case AMDGPU::OPERAND_REG_INLINE_AC_FP32: {
    int32_t Trunc = static_cast<int32_t>(Imm);
    return AMDGPU::isInlinableLiteral32(Trunc, ST.hasInv2PiInlineImm());
  }
  case AMDGPU::OPERAND_REG_IMM_INT64:
  case AMDGPU::OPERAND_REG_IMM_FP64:
  case AMDGPU::OPERAND_REG_INLINE_C_INT64:
  case AMDGPU::OPERAND_REG_INLINE_C_FP64:
  case AMDGPU::OPERAND_REG_INLINE_AC_FP64:
    return AMDGPU::isInlinableLiteral64(MO.getImm(),
                                        ST.hasInv2PiInlineImm());
  case AMDGPU::OPERAND_REG_IMM_INT16:
  case AMDGPU::OPERAND_REG_INLINE_C_INT16:
  case AMDGPU::OPERAND_REG_INLINE_AC_INT16:
    // We would expect inline immediates to not be concerned with an integer/fp
    // distinction. However, in the case of 16-bit integer operations, the
    // "floating point" values appear to not work. It seems read the low 16-bits
    // of 32-bit immediates, which happens to always work for the integer
    // values.
    //
    // See llvm bugzilla 46302.
    //
    // TODO: Theoretically we could use op-sel to use the high bits of the
    // 32-bit FP values.
    return AMDGPU::isInlinableIntLiteral(Imm);
  case AMDGPU::OPERAND_REG_IMM_V2INT16:
  case AMDGPU::OPERAND_REG_INLINE_C_V2INT16:
  case AMDGPU::OPERAND_REG_INLINE_AC_V2INT16:
    // This suffers the same problem as the scalar 16-bit cases.
    return AMDGPU::isInlinableIntLiteralV216(Imm);
  case AMDGPU::OPERAND_REG_IMM_FP16:
  case AMDGPU::OPERAND_REG_IMM_FP16_DEFERRED:
  case AMDGPU::OPERAND_REG_INLINE_C_FP16:
  case AMDGPU::OPERAND_REG_INLINE_AC_FP16: {
    if (isInt<16>(Imm) || isUInt<16>(Imm)) {
      // A few special case instructions have 16-bit operands on subtargets
      // where 16-bit instructions are not legal.
      // TODO: Do the 32-bit immediates work? We shouldn't really need to handle
      // constants in these cases
      int16_t Trunc = static_cast<int16_t>(Imm);
      return ST.has16BitInsts() &&
             AMDGPU::isInlinableLiteral16(Trunc, ST.hasInv2PiInlineImm());
    }
 
    return false;
  }
  case AMDGPU::OPERAND_REG_IMM_V2FP16:
  case AMDGPU::OPERAND_REG_INLINE_C_V2FP16:
  case AMDGPU::OPERAND_REG_INLINE_AC_V2FP16: {
    uint32_t Trunc = static_cast<uint32_t>(Imm);
    return AMDGPU::isInlinableLiteralV216(Trunc, ST.hasInv2PiInlineImm());
  }
  case AMDGPU::OPERAND_KIMM32:
  case AMDGPU::OPERAND_KIMM16:
    return false;
  default:
    llvm_unreachable("invalid bitwidth");
  }
}
 
bool SIInstrInfo::isLiteralConstantLike(const MachineOperand &MO,
                                        const MCOperandInfo &OpInfo) const {
  switch (MO.getType()) {
  case MachineOperand::MO_Register:
    return false;
  case MachineOperand::MO_Immediate:
    return !isInlineConstant(MO, OpInfo);
  case MachineOperand::MO_FrameIndex:
  case MachineOperand::MO_MachineBasicBlock:
  case MachineOperand::MO_ExternalSymbol:
  case MachineOperand::MO_GlobalAddress:
  case MachineOperand::MO_MCSymbol:
    return true;
  default:
    llvm_unreachable("unexpected operand type");
  }
}
 
static bool compareMachineOp(const MachineOperand &Op0,
                             const MachineOperand &Op1) {
  if (Op0.getType() != Op1.getType())
    return false;
 
  switch (Op0.getType()) {
  case MachineOperand::MO_Register:
    return Op0.getReg() == Op1.getReg();
  case MachineOperand::MO_Immediate:
    return Op0.getImm() == Op1.getImm();
  default:
    llvm_unreachable("Didn't expect to be comparing these operand types");
  }
}
 
bool SIInstrInfo::isImmOperandLegal(const MachineInstr &MI, unsigned OpNo,
                                    const MachineOperand &MO) const {
  const MCInstrDesc &InstDesc = MI.getDesc();
  const MCOperandInfo &OpInfo = InstDesc.OpInfo[OpNo];
 
  assert(MO.isImm() || MO.isTargetIndex() || MO.isFI() || MO.isGlobal());
 
  if (OpInfo.OperandType == MCOI::OPERAND_IMMEDIATE)
    return true;
 
  if (OpInfo.RegClass < 0)
    return false;
 
  if (MO.isImm() && isInlineConstant(MO, OpInfo)) {
    if (isMAI(MI) && ST.hasMFMAInlineLiteralBug() &&
        OpNo ==(unsigned)AMDGPU::getNamedOperandIdx(MI.getOpcode(),
                                                    AMDGPU::OpName::src2))
      return false;
    return RI.opCanUseInlineConstant(OpInfo.OperandType);
  }
 
  if (!RI.opCanUseLiteralConstant(OpInfo.OperandType))
    return false;
 
  if (!isVOP3(MI) || !AMDGPU::isSISrcOperand(InstDesc, OpNo))
    return true;
 
  return ST.hasVOP3Literal();
}
 
bool SIInstrInfo::hasVALU32BitEncoding(unsigned Opcode) const {
  // GFX90A does not have V_MUL_LEGACY_F32_e32.
  if (Opcode == AMDGPU::V_MUL_LEGACY_F32_e64 && ST.hasGFX90AInsts())
    return false;
 
  int Op32 = AMDGPU::getVOPe32(Opcode);
  if (Op32 == -1)
    return false;
 
  return pseudoToMCOpcode(Op32) != -1;
}
 
bool SIInstrInfo::hasModifiers(unsigned Opcode) const {
  // The src0_modifier operand is present on all instructions
  // that have modifiers.
 
  return AMDGPU::getNamedOperandIdx(Opcode,
                                    AMDGPU::OpName::src0_modifiers) != -1;
}
 
bool SIInstrInfo::hasModifiersSet(const MachineInstr &MI,
                                  unsigned OpName) const {
  const MachineOperand *Mods = getNamedOperand(MI, OpName);
  return Mods && Mods->getImm();
}
 
bool SIInstrInfo::hasAnyModifiersSet(const MachineInstr &MI) const {
  return any_of(ModifierOpNames,
                [&](unsigned Name) { return hasModifiersSet(MI, Name); });
}
 
bool SIInstrInfo::canShrink(const MachineInstr &MI,
                            const MachineRegisterInfo &MRI) const {
  const MachineOperand *Src2 = getNamedOperand(MI, AMDGPU::OpName::src2);
  // Can't shrink instruction with three operands.
  if (Src2) {
    switch (MI.getOpcode()) {
      default: return false;
 
      case AMDGPU::V_ADDC_U32_e64:
      case AMDGPU::V_SUBB_U32_e64:
      case AMDGPU::V_SUBBREV_U32_e64: {
        const MachineOperand *Src1
          = getNamedOperand(MI, AMDGPU::OpName::src1);
        if (!Src1->isReg() || !RI.isVGPR(MRI, Src1->getReg()))
          return false;
        // Additional verification is needed for sdst/src2.
        return true;
      }
      case AMDGPU::V_MAC_F16_e64:
      case AMDGPU::V_MAC_F32_e64:
      case AMDGPU::V_MAC_LEGACY_F32_e64:
      case AMDGPU::V_FMAC_F16_e64:
      case AMDGPU::V_FMAC_F32_e64:
      case AMDGPU::V_FMAC_F64_e64:
      case AMDGPU::V_FMAC_LEGACY_F32_e64:
        if (!Src2->isReg() || !RI.isVGPR(MRI, Src2->getReg()) ||
            hasModifiersSet(MI, AMDGPU::OpName::src2_modifiers))
          return false;
        break;
 
      case AMDGPU::V_CNDMASK_B32_e64:
        break;
    }
  }
 
  const MachineOperand *Src1 = getNamedOperand(MI, AMDGPU::OpName::src1);
  if (Src1 && (!Src1->isReg() || !RI.isVGPR(MRI, Src1->getReg()) ||
               hasModifiersSet(MI, AMDGPU::OpName::src1_modifiers)))
    return false;
 
  // We don't need to check src0, all input types are legal, so just make sure
  // src0 isn't using any modifiers.
  if (hasModifiersSet(MI, AMDGPU::OpName::src0_modifiers))
    return false;
 
  // Can it be shrunk to a valid 32 bit opcode?
  if (!hasVALU32BitEncoding(MI.getOpcode()))
    return false;
 
  // Check output modifiers
  return !hasModifiersSet(MI, AMDGPU::OpName::omod) &&
         !hasModifiersSet(MI, AMDGPU::OpName::clamp);
}
 
// Set VCC operand with all flags from \p Orig, except for setting it as
// implicit.
static void copyFlagsToImplicitVCC(MachineInstr &MI,
                                   const MachineOperand &Orig) {
 
  for (MachineOperand &Use : MI.implicit_operands()) {
    if (Use.isUse() &&
        (Use.getReg() == AMDGPU::VCC || Use.getReg() == AMDGPU::VCC_LO)) {
      Use.setIsUndef(Orig.isUndef());
      Use.setIsKill(Orig.isKill());
      return;
    }
  }
}
 
MachineInstr *SIInstrInfo::buildShrunkInst(MachineInstr &MI,
                                           unsigned Op32) const {
  MachineBasicBlock *MBB = MI.getParent();
  MachineInstrBuilder Inst32 =
    BuildMI(*MBB, MI, MI.getDebugLoc(), get(Op32))
    .setMIFlags(MI.getFlags());
 
  // Add the dst operand if the 32-bit encoding also has an explicit $vdst.
  // For VOPC instructions, this is replaced by an implicit def of vcc.
  if (AMDGPU::getNamedOperandIdx(Op32, AMDGPU::OpName::vdst) != -1) {
    // dst
    Inst32.add(MI.getOperand(0));
  } else if (AMDGPU::getNamedOperandIdx(Op32, AMDGPU::OpName::sdst) != -1) {
    // VOPCX instructions won't be writing to an explicit dst, so this should
    // not fail for these instructions.
    assert(((MI.getOperand(0).getReg() == AMDGPU::VCC) ||
            (MI.getOperand(0).getReg() == AMDGPU::VCC_LO)) &&
           "Unexpected case");
  }
 
  Inst32.add(*getNamedOperand(MI, AMDGPU::OpName::src0));
 
  const MachineOperand *Src1 = getNamedOperand(MI, AMDGPU::OpName::src1);
  if (Src1)
    Inst32.add(*Src1);
 
  const MachineOperand *Src2 = getNamedOperand(MI, AMDGPU::OpName::src2);
 
  if (Src2) {
    int Op32Src2Idx = AMDGPU::getNamedOperandIdx(Op32, AMDGPU::OpName::src2);
    if (Op32Src2Idx != -1) {
      Inst32.add(*Src2);
    } else {
      // In the case of V_CNDMASK_B32_e32, the explicit operand src2 is
      // replaced with an implicit read of vcc or vcc_lo. The implicit read
      // of vcc was already added during the initial BuildMI, but we
      // 1) may need to change vcc to vcc_lo to preserve the original register
      // 2) have to preserve the original flags.
      fixImplicitOperands(*Inst32);
      copyFlagsToImplicitVCC(*Inst32, *Src2);
    }
  }
 
  return Inst32;
}
 
bool SIInstrInfo::usesConstantBus(const MachineRegisterInfo &MRI,
                                  const MachineOperand &MO,
                                  const MCOperandInfo &OpInfo) const {
  // Literal constants use the constant bus.
  //if (isLiteralConstantLike(MO, OpInfo))
  // return true;
  if (MO.isImm())
    return !isInlineConstant(MO, OpInfo);
 
  if (!MO.isReg())
    return true; // Misc other operands like FrameIndex
 
  if (!MO.isUse())
    return false;
 
  if (MO.getReg().isVirtual())
    return RI.isSGPRClass(MRI.getRegClass(MO.getReg()));
 
  // Null is free
  if (MO.getReg() == AMDGPU::SGPR_NULL || MO.getReg() == AMDGPU::SGPR_NULL64)
    return false;
 
  // SGPRs use the constant bus
  if (MO.isImplicit()) {
    return MO.getReg() == AMDGPU::M0 ||
           MO.getReg() == AMDGPU::VCC ||
           MO.getReg() == AMDGPU::VCC_LO;
  } else {
    return AMDGPU::SReg_32RegClass.contains(MO.getReg()) ||
           AMDGPU::SReg_64RegClass.contains(MO.getReg());
  }
}
 
static Register findImplicitSGPRRead(const MachineInstr &MI) {
  for (const MachineOperand &MO : MI.implicit_operands()) {
    // We only care about reads.
    if (MO.isDef())
      continue;
 
    switch (MO.getReg()) {
    case AMDGPU::VCC:
    case AMDGPU::VCC_LO:
    case AMDGPU::VCC_HI:
    case AMDGPU::M0:
    case AMDGPU::FLAT_SCR:
      return MO.getReg();
 
    default:
      break;
    }
  }
 
  return AMDGPU::NoRegister;
}
 
static bool shouldReadExec(const MachineInstr &MI) {
  if (SIInstrInfo::isVALU(MI)) {
    switch (MI.getOpcode()) {
    case AMDGPU::V_READLANE_B32:
    case AMDGPU::V_WRITELANE_B32:
      return false;
    }
 
    return true;
  }
 
  if (MI.isPreISelOpcode() ||
      SIInstrInfo::isGenericOpcode(MI.getOpcode()) ||
      SIInstrInfo::isSALU(MI) ||
      SIInstrInfo::isSMRD(MI))
    return false;
 
  return true;
}
 
static bool isSubRegOf(const SIRegisterInfo &TRI,
                       const MachineOperand &SuperVec,
                       const MachineOperand &SubReg) {
  if (SubReg.getReg().isPhysical())
    return TRI.isSubRegister(SuperVec.getReg(), SubReg.getReg());
 
  return SubReg.getSubReg() != AMDGPU::NoSubRegister &&
         SubReg.getReg() == SuperVec.getReg();
}
 
bool SIInstrInfo::verifyInstruction(const MachineInstr &MI,
                                    StringRef &ErrInfo) const {
  uint16_t Opcode = MI.getOpcode();
  if (SIInstrInfo::isGenericOpcode(MI.getOpcode()))
    return true;
 
  const MachineFunction *MF = MI.getParent()->getParent();
  const MachineRegisterInfo &MRI = MF->getRegInfo();
 
  int Src0Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src0);
  int Src1Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src1);
  int Src2Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src2);
  int Src3Idx = -1;
  if (Src0Idx == -1) {
    // VOPD V_DUAL_* instructions use different operand names.
    Src0Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src0X);
    Src1Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::vsrc1X);
    Src2Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src0Y);
    Src3Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::vsrc1Y);
  }
 
  // Make sure the number of operands is correct.
  const MCInstrDesc &Desc = get(Opcode);
  if (!Desc.isVariadic() &&
      Desc.getNumOperands() != MI.getNumExplicitOperands()) {
    ErrInfo = "Instruction has wrong number of operands.";
    return false;
  }
 
  if (MI.isInlineAsm()) {
    // Verify register classes for inlineasm constraints.
    for (unsigned I = InlineAsm::MIOp_FirstOperand, E = MI.getNumOperands();
         I != E; ++I) {
      const TargetRegisterClass *RC = MI.getRegClassConstraint(I, this, &RI);
      if (!RC)
        continue;
 
      const MachineOperand &Op = MI.getOperand(I);
      if (!Op.isReg())
        continue;
 
      Register Reg = Op.getReg();
      if (!Reg.isVirtual() && !RC->contains(Reg)) {
        ErrInfo = "inlineasm operand has incorrect register class.";
        return false;
      }
    }
 
    return true;
  }
 
  if (isMIMG(MI) && MI.memoperands_empty() && MI.mayLoadOrStore()) {
    ErrInfo = "missing memory operand from MIMG instruction.";
    return false;
  }
 
  // Make sure the register classes are correct.
  for (int i = 0, e = Desc.getNumOperands(); i != e; ++i) {
    const MachineOperand &MO = MI.getOperand(i);
    if (MO.isFPImm()) {
      ErrInfo = "FPImm Machine Operands are not supported. ISel should bitcast "
                "all fp values to integers.";
      return false;
    }
 
    int RegClass = Desc.OpInfo[i].RegClass;
 
    switch (Desc.OpInfo[i].OperandType) {
    case MCOI::OPERAND_REGISTER:
      if (MI.getOperand(i).isImm() || MI.getOperand(i).isGlobal()) {
        ErrInfo = "Illegal immediate value for operand.";
        return false;
      }
      break;
    case AMDGPU::OPERAND_REG_IMM_INT32:
    case AMDGPU::OPERAND_REG_IMM_FP32:
    case AMDGPU::OPERAND_REG_IMM_FP32_DEFERRED:
    case AMDGPU::OPERAND_REG_IMM_V2FP32:
      break;
    case AMDGPU::OPERAND_REG_INLINE_C_INT32:
    case AMDGPU::OPERAND_REG_INLINE_C_FP32:
    case AMDGPU::OPERAND_REG_INLINE_C_INT64:
    case AMDGPU::OPERAND_REG_INLINE_C_FP64:
    case AMDGPU::OPERAND_REG_INLINE_C_INT16:
    case AMDGPU::OPERAND_REG_INLINE_C_FP16:
    case AMDGPU::OPERAND_REG_INLINE_AC_INT32:
    case AMDGPU::OPERAND_REG_INLINE_AC_FP32:
    case AMDGPU::OPERAND_REG_INLINE_AC_INT16:
    case AMDGPU::OPERAND_REG_INLINE_AC_FP16:
    case AMDGPU::OPERAND_REG_INLINE_AC_FP64: {
      if (!MO.isReg() && (!MO.isImm() || !isInlineConstant(MI, i))) {
        ErrInfo = "Illegal immediate value for operand.";
        return false;
      }
      break;
    }
    case MCOI::OPERAND_IMMEDIATE:
    case AMDGPU::OPERAND_KIMM32:
      // Check if this operand is an immediate.
      // FrameIndex operands will be replaced by immediates, so they are
      // allowed.
      if (!MI.getOperand(i).isImm() && !MI.getOperand(i).isFI()) {
        ErrInfo = "Expected immediate, but got non-immediate";
        return false;
      }
      LLVM_FALLTHROUGH;
    default:
      continue;
    }
 
    if (!MO.isReg())
      continue;
    Register Reg = MO.getReg();
    if (!Reg)
      continue;
 
    // FIXME: Ideally we would have separate instruction definitions with the
    // aligned register constraint.
    // FIXME: We do not verify inline asm operands, but custom inline asm
    // verification is broken anyway
    if (ST.needsAlignedVGPRs()) {
      const TargetRegisterClass *RC = RI.getRegClassForReg(MRI, Reg);
      if (RI.hasVectorRegisters(RC) && MO.getSubReg()) {
        const TargetRegisterClass *SubRC =
            RI.getSubRegClass(RC, MO.getSubReg());
        RC = RI.getCompatibleSubRegClass(RC, SubRC, MO.getSubReg());
        if (RC)
          RC = SubRC;
      }
 
      // Check that this is the aligned version of the class.
      if (!RC || !RI.isProperlyAlignedRC(*RC)) {
        ErrInfo = "Subtarget requires even aligned vector registers";
        return false;
      }
    }
 
    if (RegClass != -1) {
      if (Reg.isVirtual())
        continue;
 
      const TargetRegisterClass *RC = RI.getRegClass(RegClass);
      if (!RC->contains(Reg)) {
        ErrInfo = "Operand has incorrect register class.";
        return false;
      }
    }
  }
 
  // Verify SDWA
  if (isSDWA(MI)) {
    if (!ST.hasSDWA()) {
      ErrInfo = "SDWA is not supported on this target";
      return false;
    }
 
    int DstIdx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::vdst);
 
    for (int OpIdx : {DstIdx, Src0Idx, Src1Idx, Src2Idx}) {
      if (OpIdx == -1)
        continue;
      const MachineOperand &MO = MI.getOperand(OpIdx);
 
      if (!ST.hasSDWAScalar()) {
        // Only VGPRS on VI
        if (!MO.isReg() || !RI.hasVGPRs(RI.getRegClassForReg(MRI, MO.getReg()))) {
          ErrInfo = "Only VGPRs allowed as operands in SDWA instructions on VI";
          return false;
        }
      } else {
        // No immediates on GFX9
        if (!MO.isReg()) {
          ErrInfo =
            "Only reg allowed as operands in SDWA instructions on GFX9+";
          return false;
        }
      }
    }
 
    if (!ST.hasSDWAOmod()) {
      // No omod allowed on VI
      const MachineOperand *OMod = getNamedOperand(MI, AMDGPU::OpName::omod);
      if (OMod != nullptr &&
        (!OMod->isImm() || OMod->getImm() != 0)) {
        ErrInfo = "OMod not allowed in SDWA instructions on VI";
        return false;
      }
    }
 
    uint16_t BasicOpcode = AMDGPU::getBasicFromSDWAOp(Opcode);
    if (isVOPC(BasicOpcode)) {
      if (!ST.hasSDWASdst() && DstIdx != -1) {
        // Only vcc allowed as dst on VI for VOPC
        const MachineOperand &Dst = MI.getOperand(DstIdx);
        if (!Dst.isReg() || Dst.getReg() != AMDGPU::VCC) {
          ErrInfo = "Only VCC allowed as dst in SDWA instructions on VI";
          return false;
        }
      } else if (!ST.hasSDWAOutModsVOPC()) {
        // No clamp allowed on GFX9 for VOPC
        const MachineOperand *Clamp = getNamedOperand(MI, AMDGPU::OpName::clamp);
        if (Clamp && (!Clamp->isImm() || Clamp->getImm() != 0)) {
          ErrInfo = "Clamp not allowed in VOPC SDWA instructions on VI";
          return false;
        }
 
        // No omod allowed on GFX9 for VOPC
        const MachineOperand *OMod = getNamedOperand(MI, AMDGPU::OpName::omod);
        if (OMod && (!OMod->isImm() || OMod->getImm() != 0)) {
          ErrInfo = "OMod not allowed in VOPC SDWA instructions on VI";
          return false;
        }
      }
    }
 
    const MachineOperand *DstUnused = getNamedOperand(MI, AMDGPU::OpName::dst_unused);
    if (DstUnused && DstUnused->isImm() &&
        DstUnused->getImm() == AMDGPU::SDWA::UNUSED_PRESERVE) {
      const MachineOperand &Dst = MI.getOperand(DstIdx);
      if (!Dst.isReg() || !Dst.isTied()) {
        ErrInfo = "Dst register should have tied register";
        return false;
      }
 
      const MachineOperand &TiedMO =
          MI.getOperand(MI.findTiedOperandIdx(DstIdx));
      if (!TiedMO.isReg() || !TiedMO.isImplicit() || !TiedMO.isUse()) {
        ErrInfo =
            "Dst register should be tied to implicit use of preserved register";
        return false;
      } else if (TiedMO.getReg().isPhysical() &&
                 Dst.getReg() != TiedMO.getReg()) {
        ErrInfo = "Dst register should use same physical register as preserved";
        return false;
      }
    }
  }
 
  // Verify MIMG
  if (isMIMG(MI.getOpcode()) && !MI.mayStore()) {
    // Ensure that the return type used is large enough for all the options
    // being used TFE/LWE require an extra result register.
    const MachineOperand *DMask = getNamedOperand(MI, AMDGPU::OpName::dmask);
    if (DMask) {
      uint64_t DMaskImm = DMask->getImm();
      uint32_t RegCount =
          isGather4(MI.getOpcode()) ? 4 : countPopulation(DMaskImm);
      const MachineOperand *TFE = getNamedOperand(MI, AMDGPU::OpName::tfe);
      const MachineOperand *LWE = getNamedOperand(MI, AMDGPU::OpName::lwe);
      const MachineOperand *D16 = getNamedOperand(MI, AMDGPU::OpName::d16);
 
      // Adjust for packed 16 bit values
      if (D16 && D16->getImm() && !ST.hasUnpackedD16VMem())
        RegCount >>= 1;
 
      // Adjust if using LWE or TFE
      if ((LWE && LWE->getImm()) || (TFE && TFE->getImm()))
        RegCount += 1;
 
      const uint32_t DstIdx =
          AMDGPU::getNamedOperandIdx(MI.getOpcode(), AMDGPU::OpName::vdata);
      const MachineOperand &Dst = MI.getOperand(DstIdx);
      if (Dst.isReg()) {
        const TargetRegisterClass *DstRC = getOpRegClass(MI, DstIdx);
        uint32_t DstSize = RI.getRegSizeInBits(*DstRC) / 32;
        if (RegCount > DstSize) {
          ErrInfo = "MIMG instruction returns too many registers for dst "
                    "register class";
          return false;
        }
      }
    }
  }
 
  // Verify VOP*. Ignore multiple sgpr operands on writelane.
  if (isVALU(MI) && Desc.getOpcode() != AMDGPU::V_WRITELANE_B32) {
    unsigned ConstantBusCount = 0;
    bool UsesLiteral = false;
    const MachineOperand *LiteralVal = nullptr;
 
    int ImmIdx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::imm);
    if (ImmIdx != -1) {
      ++ConstantBusCount;
      UsesLiteral = true;
      LiteralVal = &MI.getOperand(ImmIdx);
    }
 
    SmallVector<Register, 2> SGPRsUsed;
    Register SGPRUsed;
 
    // Only look at the true operands. Only a real operand can use the constant
    // bus, and we don't want to check pseudo-operands like the source modifier
    // flags.
    for (int OpIdx : {Src0Idx, Src1Idx, Src2Idx, Src3Idx}) {
      if (OpIdx == -1)
        continue;
      const MachineOperand &MO = MI.getOperand(OpIdx);
      if (usesConstantBus(MRI, MO, MI.getDesc().OpInfo[OpIdx])) {
        if (MO.isReg()) {
          SGPRUsed = MO.getReg();
          if (llvm::all_of(SGPRsUsed, [SGPRUsed](unsigned SGPR) {
                return SGPRUsed != SGPR;
              })) {
            ++ConstantBusCount;
            SGPRsUsed.push_back(SGPRUsed);
          }
        } else {
          if (!UsesLiteral) {
            ++ConstantBusCount;
            UsesLiteral = true;
            LiteralVal = &MO;
          } else if (!MO.isIdenticalTo(*LiteralVal)) {
            assert(isVOP2(MI) || isVOP3(MI));
            ErrInfo = "VOP2/VOP3 instruction uses more than one literal";
            return false;
          }
        }
      }
    }
 
    SGPRUsed = findImplicitSGPRRead(MI);
    if (SGPRUsed != AMDGPU::NoRegister) {
      // Implicit uses may safely overlap true operands
      if (llvm::all_of(SGPRsUsed, [this, SGPRUsed](unsigned SGPR) {
            return !RI.regsOverlap(SGPRUsed, SGPR);
          })) {
        ++ConstantBusCount;
        SGPRsUsed.push_back(SGPRUsed);
      }
    }
 
    // v_writelane_b32 is an exception from constant bus restriction:
    // vsrc0 can be sgpr, const or m0 and lane select sgpr, m0 or inline-const
    if (ConstantBusCount > ST.getConstantBusLimit(Opcode) &&
        Opcode != AMDGPU::V_WRITELANE_B32) {
      ErrInfo = "VOP* instruction violates constant bus restriction";
      return false;
    }
 
    if (isVOP3(MI) && UsesLiteral && !ST.hasVOP3Literal()) {
      ErrInfo = "VOP3 instruction uses literal";
      return false;
    }
  }
 
  // Special case for writelane - this can break the multiple constant bus rule,
  // but still can't use more than one SGPR register
  if (Desc.getOpcode() == AMDGPU::V_WRITELANE_B32) {
    unsigned SGPRCount = 0;
    Register SGPRUsed = AMDGPU::NoRegister;
 
    for (int OpIdx : {Src0Idx, Src1Idx}) {
      if (OpIdx == -1)
        break;
 
      const MachineOperand &MO = MI.getOperand(OpIdx);
 
      if (usesConstantBus(MRI, MO, MI.getDesc().OpInfo[OpIdx])) {
        if (MO.isReg() && MO.getReg() != AMDGPU::M0) {
          if (MO.getReg() != SGPRUsed)
            ++SGPRCount;
          SGPRUsed = MO.getReg();
        }
      }
      if (SGPRCount > ST.getConstantBusLimit(Opcode)) {
        ErrInfo = "WRITELANE instruction violates constant bus restriction";
        return false;
      }
    }
  }
 
  // Verify misc. restrictions on specific instructions.
  if (Desc.getOpcode() == AMDGPU::V_DIV_SCALE_F32_e64 ||
      Desc.getOpcode() == AMDGPU::V_DIV_SCALE_F64_e64) {
    const MachineOperand &Src0 = MI.getOperand(Src0Idx);
    const MachineOperand &Src1 = MI.getOperand(Src1Idx);
    const MachineOperand &Src2 = MI.getOperand(Src2Idx);
    if (Src0.isReg() && Src1.isReg() && Src2.isReg()) {
      if (!compareMachineOp(Src0, Src1) &&
          !compareMachineOp(Src0, Src2)) {
        ErrInfo = "v_div_scale_{f32|f64} require src0 = src1 or src2";
        return false;
      }
    }
    if ((getNamedOperand(MI, AMDGPU::OpName::src0_modifiers)->getImm() &
         SISrcMods::ABS) ||
        (getNamedOperand(MI, AMDGPU::OpName::src1_modifiers)->getImm() &
         SISrcMods::ABS) ||
        (getNamedOperand(MI, AMDGPU::OpName::src2_modifiers)->getImm() &
         SISrcMods::ABS)) {
      ErrInfo = "ABS not allowed in VOP3B instructions";
      return false;
    }
  }
 
  if (isSOP2(MI) || isSOPC(MI)) {
    const MachineOperand &Src0 = MI.getOperand(Src0Idx);
    const MachineOperand &Src1 = MI.getOperand(Src1Idx);
 
    if (!Src0.isReg() && !Src1.isReg() &&
        !isInlineConstant(Src0, Desc.OpInfo[Src0Idx].OperandType) &&
        !isInlineConstant(Src1, Desc.OpInfo[Src1Idx].OperandType) &&
        !Src0.isIdenticalTo(Src1)) {
      ErrInfo = "SOP2/SOPC instruction requires too many immediate constants";
      return false;
    }
  }
 
  if (isSOPK(MI)) {
    auto Op = getNamedOperand(MI, AMDGPU::OpName::simm16);
    if (Desc.isBranch()) {
      if (!Op->isMBB()) {
        ErrInfo = "invalid branch target for SOPK instruction";
        return false;
      }
    } else {
      uint64_t Imm = Op->getImm();
      if (sopkIsZext(MI)) {
        if (!isUInt<16>(Imm)) {
          ErrInfo = "invalid immediate for SOPK instruction";
          return false;
        }
      } else {
        if (!isInt<16>(Imm)) {
          ErrInfo = "invalid immediate for SOPK instruction";
          return false;
        }
      }
    }
  }
 
  if (Desc.getOpcode() == AMDGPU::V_MOVRELS_B32_e32 ||
      Desc.getOpcode() == AMDGPU::V_MOVRELS_B32_e64 ||
      Desc.getOpcode() == AMDGPU::V_MOVRELD_B32_e32 ||
      Desc.getOpcode() == AMDGPU::V_MOVRELD_B32_e64) {
    const bool IsDst = Desc.getOpcode() == AMDGPU::V_MOVRELD_B32_e32 ||
                       Desc.getOpcode() == AMDGPU::V_MOVRELD_B32_e64;
 
    const unsigned StaticNumOps = Desc.getNumOperands() +
      Desc.getNumImplicitUses();
    const unsigned NumImplicitOps = IsDst ? 2 : 1;
 
    // Allow additional implicit operands. This allows a fixup done by the post
    // RA scheduler where the main implicit operand is killed and implicit-defs
    // are added for sub-registers that remain live after this instruction.
    if (MI.getNumOperands() < StaticNumOps + NumImplicitOps) {
      ErrInfo = "missing implicit register operands";
      return false;
    }
 
    const MachineOperand *Dst = getNamedOperand(MI, AMDGPU::OpName::vdst);
    if (IsDst) {
      if (!Dst->isUse()) {
        ErrInfo = "v_movreld_b32 vdst should be a use operand";
        return false;
      }
 
      unsigned UseOpIdx;
      if (!MI.isRegTiedToUseOperand(StaticNumOps, &UseOpIdx) ||
          UseOpIdx != StaticNumOps + 1) {
        ErrInfo = "movrel implicit operands should be tied";
        return false;
      }
    }
 
    const MachineOperand &Src0 = MI.getOperand(Src0Idx);
    const MachineOperand &ImpUse
      = MI.getOperand(StaticNumOps + NumImplicitOps - 1);
    if (!ImpUse.isReg() || !ImpUse.isUse() ||
        !isSubRegOf(RI, ImpUse, IsDst ? *Dst : Src0)) {
      ErrInfo = "src0 should be subreg of implicit vector use";
      return false;
    }
  }
 
  // Make sure we aren't losing exec uses in the td files. This mostly requires
  // being careful when using let Uses to try to add other use registers.
  if (shouldReadExec(MI)) {
    if (!MI.hasRegisterImplicitUseOperand(AMDGPU::EXEC)) {
      ErrInfo = "VALU instruction does not implicitly read exec mask";
      return false;
    }
  }
 
  if (isSMRD(MI)) {
    if (MI.mayStore() &&
        ST.getGeneration() == AMDGPUSubtarget::VOLCANIC_ISLANDS) {
      // The register offset form of scalar stores may only use m0 as the
      // soffset register.
      const MachineOperand *Soff = getNamedOperand(MI, AMDGPU::OpName::soffset);
      if (Soff && Soff->getReg() != AMDGPU::M0) {
        ErrInfo = "scalar stores must use m0 as offset register";
        return false;
      }
    }
  }
 
  if (isFLAT(MI) && !ST.hasFlatInstOffsets()) {
    const MachineOperand *Offset = getNamedOperand(MI, AMDGPU::OpName::offset);
    if (Offset->getImm() != 0) {
      ErrInfo = "subtarget does not support offsets in flat instructions";
      return false;
    }
  }
 
  if (isMIMG(MI)) {
    const MachineOperand *DimOp = getNamedOperand(MI, AMDGPU::OpName::dim);
    if (DimOp) {
      int VAddr0Idx = AMDGPU::getNamedOperandIdx(Opcode,
                                                 AMDGPU::OpName::vaddr0);
      int SRsrcIdx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::srsrc);
      const AMDGPU::MIMGInfo *Info = AMDGPU::getMIMGInfo(Opcode);
      const AMDGPU::MIMGBaseOpcodeInfo *BaseOpcode =
          AMDGPU::getMIMGBaseOpcodeInfo(Info->BaseOpcode);
      const AMDGPU::MIMGDimInfo *Dim =
          AMDGPU::getMIMGDimInfoByEncoding(DimOp->getImm());
 
      if (!Dim) {
        ErrInfo = "dim is out of range";
        return false;
      }
 
      bool IsA16 = false;
      if (ST.hasR128A16()) {
        const MachineOperand *R128A16 = getNamedOperand(MI, AMDGPU::OpName::r128);
        IsA16 = R128A16->getImm() != 0;
      } else if (ST.hasGFX10A16()) {
        const MachineOperand *A16 = getNamedOperand(MI, AMDGPU::OpName::a16);
        IsA16 = A16->getImm() != 0;
      }
 
      bool IsNSA = SRsrcIdx - VAddr0Idx > 1;
 
      unsigned AddrWords =
          AMDGPU::getAddrSizeMIMGOp(BaseOpcode, Dim, IsA16, ST.hasG16());
 
      unsigned VAddrWords;
      if (IsNSA) {
        VAddrWords = SRsrcIdx - VAddr0Idx;
      } else {
        const TargetRegisterClass *RC = getOpRegClass(MI, VAddr0Idx);
        VAddrWords = MRI.getTargetRegisterInfo()->getRegSizeInBits(*RC) / 32;
        if (AddrWords > 8)
          AddrWords = 16;
      }
 
      if (VAddrWords != AddrWords) {
        LLVM_DEBUG(dbgs() << "bad vaddr size, expected " << AddrWords
                          << " but got " << VAddrWords << "\n");
        ErrInfo = "bad vaddr size";
        return false;
      }
    }
  }
 
  const MachineOperand *DppCt = getNamedOperand(MI, AMDGPU::OpName::dpp_ctrl);
  if (DppCt) {
    using namespace AMDGPU::DPP;
 
    unsigned DC = DppCt->getImm();
    if (DC == DppCtrl::DPP_UNUSED1 || DC == DppCtrl::DPP_UNUSED2 ||
        DC == DppCtrl::DPP_UNUSED3 || DC > DppCtrl::DPP_LAST ||
        (DC >= DppCtrl::DPP_UNUSED4_FIRST && DC <= DppCtrl::DPP_UNUSED4_LAST) ||
        (DC >= DppCtrl::DPP_UNUSED5_FIRST && DC <= DppCtrl::DPP_UNUSED5_LAST) ||
        (DC >= DppCtrl::DPP_UNUSED6_FIRST && DC <= DppCtrl::DPP_UNUSED6_LAST) ||
        (DC >= DppCtrl::DPP_UNUSED7_FIRST && DC <= DppCtrl::DPP_UNUSED7_LAST) ||
        (DC >= DppCtrl::DPP_UNUSED8_FIRST && DC <= DppCtrl::DPP_UNUSED8_LAST)) {
      ErrInfo = "Invalid dpp_ctrl value";
      return false;
    }
    if (DC >= DppCtrl::WAVE_SHL1 && DC <= DppCtrl::WAVE_ROR1 &&
        ST.getGeneration() >= AMDGPUSubtarget::GFX10) {
      ErrInfo = "Invalid dpp_ctrl value: "
                "wavefront shifts are not supported on GFX10+";
      return false;
    }
    if (DC >= DppCtrl::BCAST15 && DC <= DppCtrl::BCAST31 &&
        ST.getGeneration() >= AMDGPUSubtarget::GFX10) {
      ErrInfo = "Invalid dpp_ctrl value: "
                "broadcasts are not supported on GFX10+";
      return false;
    }
    if (DC >= DppCtrl::ROW_SHARE_FIRST && DC <= DppCtrl::ROW_XMASK_LAST &&
        ST.getGeneration() < AMDGPUSubtarget::GFX10) {
      if (DC >= DppCtrl::ROW_NEWBCAST_FIRST &&
          DC <= DppCtrl::ROW_NEWBCAST_LAST &&
          !ST.hasGFX90AInsts()) {
        ErrInfo = "Invalid dpp_ctrl value: "
                  "row_newbroadcast/row_share is not supported before "
                  "GFX90A/GFX10";
        return false;
      } else if (DC > DppCtrl::ROW_NEWBCAST_LAST || !ST.hasGFX90AInsts()) {
        ErrInfo = "Invalid dpp_ctrl value: "
                  "row_share and row_xmask are not supported before GFX10";
        return false;
      }
    }
 
    int DstIdx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::vdst);
 
    if (Opcode != AMDGPU::V_MOV_B64_DPP_PSEUDO &&
        ((DstIdx >= 0 &&
          (Desc.OpInfo[DstIdx].RegClass == AMDGPU::VReg_64RegClassID ||
           Desc.OpInfo[DstIdx].RegClass == AMDGPU::VReg_64_Align2RegClassID)) ||
         ((Src0Idx >= 0 &&
           (Desc.OpInfo[Src0Idx].RegClass == AMDGPU::VReg_64RegClassID ||
            Desc.OpInfo[Src0Idx].RegClass ==
                AMDGPU::VReg_64_Align2RegClassID)))) &&
        !AMDGPU::isLegal64BitDPPControl(DC)) {
      ErrInfo = "Invalid dpp_ctrl value: "
                "64 bit dpp only support row_newbcast";
      return false;
    }
  }
 
  if ((MI.mayStore() || MI.mayLoad()) && !isVGPRSpill(MI)) {
    const MachineOperand *Dst = getNamedOperand(MI, AMDGPU::OpName::vdst);
    uint16_t DataNameIdx = isDS(Opcode) ? AMDGPU::OpName::data0
                                        : AMDGPU::OpName::vdata;
    const MachineOperand *Data = getNamedOperand(MI, DataNameIdx);
    const MachineOperand *Data2 = getNamedOperand(MI, AMDGPU::OpName::data1);
    if (Data && !Data->isReg())
      Data = nullptr;
 
    if (ST.hasGFX90AInsts()) {
      if (Dst && Data &&
          (RI.isAGPR(MRI, Dst->getReg()) != RI.isAGPR(MRI, Data->getReg()))) {
        ErrInfo = "Invalid register class: "
                  "vdata and vdst should be both VGPR or AGPR";
        return false;
      }
      if (Data && Data2 &&
          (RI.isAGPR(MRI, Data->getReg()) != RI.isAGPR(MRI, Data2->getReg()))) {
        ErrInfo = "Invalid register class: "
                  "both data operands should be VGPR or AGPR";
        return false;
      }
    } else {
      if ((Dst && RI.isAGPR(MRI, Dst->getReg())) ||
          (Data && RI.isAGPR(MRI, Data->getReg())) ||
          (Data2 && RI.isAGPR(MRI, Data2->getReg()))) {
        ErrInfo = "Invalid register class: "
                  "agpr loads and stores not supported on this GPU";
        return false;
      }
    }
  }
 
  if (ST.needsAlignedVGPRs()) {
    const auto isAlignedReg = [&MI, &MRI, this](unsigned OpName) -> bool {
      const MachineOperand *Op = getNamedOperand(MI, OpName);
      if (!Op)
        return true;
      Register Reg = Op->getReg();
      if (Reg.isPhysical())
        return !(RI.getHWRegIndex(Reg) & 1);
      const TargetRegisterClass &RC = *MRI.getRegClass(Reg);
      return RI.getRegSizeInBits(RC) > 32 && RI.isProperlyAlignedRC(RC) &&
             !(RI.getChannelFromSubReg(Op->getSubReg()) & 1);
    };
 
    if (MI.getOpcode() == AMDGPU::DS_GWS_INIT ||
        MI.getOpcode() == AMDGPU::DS_GWS_SEMA_BR ||
        MI.getOpcode() == AMDGPU::DS_GWS_BARRIER) {
 
      if (!isAlignedReg(AMDGPU::OpName::data0)) {
        ErrInfo = "Subtarget requires even aligned vector registers "
                  "for DS_GWS instructions";
        return false;
      }
    }
 
    if (isMIMG(MI)) {
      if (!isAlignedReg(AMDGPU::OpName::vaddr)) {
        ErrInfo = "Subtarget requires even aligned vector registers "
                  "for vaddr operand of image instructions";
        return false;
      }
    }
  }
 
  if (MI.getOpcode() == AMDGPU::V_ACCVGPR_WRITE_B32_e64 &&
      !ST.hasGFX90AInsts()) {
    const MachineOperand *Src = getNamedOperand(MI, AMDGPU::OpName::src0);
    if (Src->isReg() && RI.isSGPRReg(MRI, Src->getReg())) {
      ErrInfo = "Invalid register class: "
                "v_accvgpr_write with an SGPR is not supported on this GPU";
      return false;
    }
  }
 
  if (Desc.getOpcode() == AMDGPU::G_AMDGPU_WAVE_ADDRESS) {
    const MachineOperand &SrcOp = MI.getOperand(1);
    if (!SrcOp.isReg() || SrcOp.getReg().isVirtual()) {
      ErrInfo = "pseudo expects only physical SGPRs";
      return false;
    }
  }
 
  return true;
}
 
unsigned SIInstrInfo::getVALUOp(const MachineInstr &MI) const {
  switch (MI.getOpcode()) {
  default: return AMDGPU::INSTRUCTION_LIST_END;
  case AMDGPU::REG_SEQUENCE: return AMDGPU::REG_SEQUENCE;
  case AMDGPU::COPY: return AMDGPU::COPY;
  case AMDGPU::PHI: return AMDGPU::PHI;
  case AMDGPU::INSERT_SUBREG: return AMDGPU::INSERT_SUBREG;
  case AMDGPU::WQM: return AMDGPU::WQM;
  case AMDGPU::SOFT_WQM: return AMDGPU::SOFT_WQM;
  case AMDGPU::STRICT_WWM: return AMDGPU::STRICT_WWM;
  case AMDGPU::STRICT_WQM: return AMDGPU::STRICT_WQM;
  case AMDGPU::S_MOV_B32: {
    const MachineRegisterInfo &MRI = MI.getParent()->getParent()->getRegInfo();
    return MI.getOperand(1).isReg() ||
           RI.isAGPR(MRI, MI.getOperand(0).getReg()) ?
           AMDGPU::COPY : AMDGPU::V_MOV_B32_e32;
  }
  case AMDGPU::S_ADD_I32:
    return ST.hasAddNoCarry() ? AMDGPU::V_ADD_U32_e64 : AMDGPU::V_ADD_CO_U32_e32;
  case AMDGPU::S_ADDC_U32:
    return AMDGPU::V_ADDC_U32_e32;
  case AMDGPU::S_SUB_I32:
    return ST.hasAddNoCarry() ? AMDGPU::V_SUB_U32_e64 : AMDGPU::V_SUB_CO_U32_e32;
    // FIXME: These are not consistently handled, and selected when the carry is
    // used.
  case AMDGPU::S_ADD_U32:
    return AMDGPU::V_ADD_CO_U32_e32;
  case AMDGPU::S_SUB_U32:
    return AMDGPU::V_SUB_CO_U32_e32;
  case AMDGPU::S_SUBB_U32: return AMDGPU::V_SUBB_U32_e32;
  case AMDGPU::S_MUL_I32: return AMDGPU::V_MUL_LO_U32_e64;
  case AMDGPU::S_MUL_HI_U32: return AMDGPU::V_MUL_HI_U32_e64;
  case AMDGPU::S_MUL_HI_I32: return AMDGPU::V_MUL_HI_I32_e64;
  case AMDGPU::S_AND_B32: return AMDGPU::V_AND_B32_e64;
  case AMDGPU::S_OR_B32: return AMDGPU::V_OR_B32_e64;
  case AMDGPU::S_XOR_B32: return AMDGPU::V_XOR_B32_e64;
  case AMDGPU::S_XNOR_B32:
    return ST.hasDLInsts() ? AMDGPU::V_XNOR_B32_e64 : AMDGPU::INSTRUCTION_LIST_END;
  case AMDGPU::S_MIN_I32: return AMDGPU::V_MIN_I32_e64;
  case AMDGPU::S_MIN_U32: return AMDGPU::V_MIN_U32_e64;
  case AMDGPU::S_MAX_I32: return AMDGPU::V_MAX_I32_e64;
  case AMDGPU::S_MAX_U32: return AMDGPU::V_MAX_U32_e64;
  case AMDGPU::S_ASHR_I32: return AMDGPU::V_ASHR_I32_e32;
  case AMDGPU::S_ASHR_I64: return AMDGPU::V_ASHR_I64_e64;
  case AMDGPU::S_LSHL_B32: return AMDGPU::V_LSHL_B32_e32;
  case AMDGPU::S_LSHL_B64: return AMDGPU::V_LSHL_B64_e64;
  case AMDGPU::S_LSHR_B32: return AMDGPU::V_LSHR_B32_e32;
  case AMDGPU::S_LSHR_B64: return AMDGPU::V_LSHR_B64_e64;
  case AMDGPU::S_SEXT_I32_I8: return AMDGPU::V_BFE_I32_e64;
  case AMDGPU::S_SEXT_I32_I16: return AMDGPU::V_BFE_I32_e64;
  case AMDGPU::S_BFE_U32: return AMDGPU::V_BFE_U32_e64;
  case AMDGPU::S_BFE_I32: return AMDGPU::V_BFE_I32_e64;
  case AMDGPU::S_BFM_B32: return AMDGPU::V_BFM_B32_e64;
  case AMDGPU::S_BREV_B32: return AMDGPU::V_BFREV_B32_e32;
  case AMDGPU::S_NOT_B32: return AMDGPU::V_NOT_B32_e32;
  case AMDGPU::S_NOT_B64: return AMDGPU::V_NOT_B32_e32;
  case AMDGPU::S_CMP_EQ_I32: return AMDGPU::V_CMP_EQ_I32_e64;
  case AMDGPU::S_CMP_LG_I32: return AMDGPU::V_CMP_NE_I32_e64;
  case AMDGPU::S_CMP_GT_I32: return AMDGPU::V_CMP_GT_I32_e64;
  case AMDGPU::S_CMP_GE_I32: return AMDGPU::V_CMP_GE_I32_e64;
  case AMDGPU::S_CMP_LT_I32: return AMDGPU::V_CMP_LT_I32_e64;
  case AMDGPU::S_CMP_LE_I32: return AMDGPU::V_CMP_LE_I32_e64;
  case AMDGPU::S_CMP_EQ_U32: return AMDGPU::V_CMP_EQ_U32_e64;
  case AMDGPU::S_CMP_LG_U32: return AMDGPU::V_CMP_NE_U32_e64;
  case AMDGPU::S_CMP_GT_U32: return AMDGPU::V_CMP_GT_U32_e64;
  case AMDGPU::S_CMP_GE_U32: return AMDGPU::V_CMP_GE_U32_e64;
  case AMDGPU::S_CMP_LT_U32: return AMDGPU::V_CMP_LT_U32_e64;
  case AMDGPU::S_CMP_LE_U32: return AMDGPU::V_CMP_LE_U32_e64;
  case AMDGPU::S_CMP_EQ_U64: return AMDGPU::V_CMP_EQ_U64_e64;
  case AMDGPU::S_CMP_LG_U64: return AMDGPU::V_CMP_NE_U64_e64;
  case AMDGPU::S_BCNT1_I32_B32: return AMDGPU::V_BCNT_U32_B32_e64;
  case AMDGPU::S_FF1_I32_B32: return AMDGPU::V_FFBL_B32_e32;
  case AMDGPU::S_FLBIT_I32_B32: return AMDGPU::V_FFBH_U32_e32;
  case AMDGPU::S_FLBIT_I32: return AMDGPU::V_FFBH_I32_e64;
  case AMDGPU::S_CBRANCH_SCC0: return AMDGPU::S_CBRANCH_VCCZ;
  case AMDGPU::S_CBRANCH_SCC1: return AMDGPU::S_CBRANCH_VCCNZ;
  }
  llvm_unreachable(
      "Unexpected scalar opcode without corresponding vector one!");
}
 
static const TargetRegisterClass *
adjustAllocatableRegClass(const GCNSubtarget &ST, const SIRegisterInfo &RI,
                          const MachineRegisterInfo &MRI,
                          const MCInstrDesc &TID, unsigned RCID,
                          bool IsAllocatable) {
  if ((IsAllocatable || !ST.hasGFX90AInsts() || !MRI.reservedRegsFrozen()) &&
      (((TID.mayLoad() || TID.mayStore()) &&
        !(TID.TSFlags & SIInstrFlags::VGPRSpill)) ||
       (TID.TSFlags & (SIInstrFlags::DS | SIInstrFlags::MIMG)))) {
    switch (RCID) {
    case AMDGPU::AV_32RegClassID:
      RCID = AMDGPU::VGPR_32RegClassID;
      break;
    case AMDGPU::AV_64RegClassID:
      RCID = AMDGPU::VReg_64RegClassID;
      break;
    case AMDGPU::AV_96RegClassID:
      RCID = AMDGPU::VReg_96RegClassID;
      break;
    case AMDGPU::AV_128RegClassID:
      RCID = AMDGPU::VReg_128RegClassID;
      break;
    case AMDGPU::AV_160RegClassID:
      RCID = AMDGPU::VReg_160RegClassID;
      break;
    case AMDGPU::AV_512RegClassID:
      RCID = AMDGPU::VReg_512RegClassID;
      break;
    default:
      break;
    }
  }
 
  return RI.getProperlyAlignedRC(RI.getRegClass(RCID));
}
 
const TargetRegisterClass *SIInstrInfo::getRegClass(const MCInstrDesc &TID,
    unsigned OpNum, const TargetRegisterInfo *TRI,
    const MachineFunction &MF)
  const {
  if (OpNum >= TID.getNumOperands())
    return nullptr;
  auto RegClass = TID.OpInfo[OpNum].RegClass;
  bool IsAllocatable = false;
  if (TID.TSFlags & (SIInstrFlags::DS | SIInstrFlags::FLAT)) {
    // vdst and vdata should be both VGPR or AGPR, same for the DS instructions
    // with two data operands. Request register class constrained to VGPR only
    // of both operands present as Machine Copy Propagation can not check this
    // constraint and possibly other passes too.
    //
    // The check is limited to FLAT and DS because atomics in non-flat encoding
    // have their vdst and vdata tied to be the same register.
    const int VDstIdx = AMDGPU::getNamedOperandIdx(TID.Opcode,
                                                   AMDGPU::OpName::vdst);
    const int DataIdx = AMDGPU::getNamedOperandIdx(TID.Opcode,
        (TID.TSFlags & SIInstrFlags::DS) ? AMDGPU::OpName::data0
                                         : AMDGPU::OpName::vdata);
    if (DataIdx != -1) {
      IsAllocatable = VDstIdx != -1 ||