1 files changed, 673 insertions, 0 deletions

diff --git a/contrib/llvm-project/llvm/lib/CodeGen/MachineRegisterInfo.cpp b/contrib/llvm-project/llvm/lib/CodeGen/MachineRegisterInfo.cpp
new file mode 100644
index 000000000000..f0fd0405d69d
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/CodeGen/MachineRegisterInfo.cpp
@@ -0,0 +1,673 @@
+//===- lib/Codegen/MachineRegisterInfo.cpp --------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Implementation of the MachineRegisterInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/ADT/iterator_range.h"
+#include "llvm/CodeGen/LowLevelType.h"
+#include "llvm/CodeGen/MachineBasicBlock.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineOperand.h"
+#include "llvm/CodeGen/TargetInstrInfo.h"
+#include "llvm/CodeGen/TargetRegisterInfo.h"
+#include "llvm/CodeGen/TargetSubtargetInfo.h"
+#include "llvm/Config/llvm-config.h"
+#include "llvm/IR/Attributes.h"
+#include "llvm/IR/DebugLoc.h"
+#include "llvm/IR/Function.h"
+#include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cassert>
+
+using namespace llvm;
+
+static cl::opt<bool> EnableSubRegLiveness("enable-subreg-liveness", cl::Hidden,
+  cl::init(true), cl::desc("Enable subregister liveness tracking."));
+
+// Pin the vtable to this file.
+void MachineRegisterInfo::Delegate::anchor() {}
+
+MachineRegisterInfo::MachineRegisterInfo(MachineFunction *MF)
+    : MF(MF), TracksSubRegLiveness(MF->getSubtarget().enableSubRegLiveness() &&
+                                   EnableSubRegLiveness),
+      IsUpdatedCSRsInitialized(false) {
+  unsigned NumRegs = getTargetRegisterInfo()->getNumRegs();
+  VRegInfo.reserve(256);
+  RegAllocHints.reserve(256);
+  UsedPhysRegMask.resize(NumRegs);
+  PhysRegUseDefLists.reset(new MachineOperand*[NumRegs]());
+}
+
+/// setRegClass - Set the register class of the specified virtual register.
+///
+void
+MachineRegisterInfo::setRegClass(unsigned Reg, const TargetRegisterClass *RC) {
+  assert(RC && RC->isAllocatable() && "Invalid RC for virtual register");
+  VRegInfo[Reg].first = RC;
+}
+
+void MachineRegisterInfo::setRegBank(unsigned Reg,
+                                     const RegisterBank &RegBank) {
+  VRegInfo[Reg].first = &RegBank;
+}
+
+static const TargetRegisterClass *
+constrainRegClass(MachineRegisterInfo &MRI, unsigned Reg,
+                  const TargetRegisterClass *OldRC,
+                  const TargetRegisterClass *RC, unsigned MinNumRegs) {
+  if (OldRC == RC)
+    return RC;
+  const TargetRegisterClass *NewRC =
+      MRI.getTargetRegisterInfo()->getCommonSubClass(OldRC, RC);
+  if (!NewRC || NewRC == OldRC)
+    return NewRC;
+  if (NewRC->getNumRegs() < MinNumRegs)
+    return nullptr;
+  MRI.setRegClass(Reg, NewRC);
+  return NewRC;
+}
+
+const TargetRegisterClass *
+MachineRegisterInfo::constrainRegClass(unsigned Reg,
+                                       const TargetRegisterClass *RC,
+                                       unsigned MinNumRegs) {
+  return ::constrainRegClass(*this, Reg, getRegClass(Reg), RC, MinNumRegs);
+}
+
+bool
+MachineRegisterInfo::constrainRegAttrs(unsigned Reg,
+                                       unsigned ConstrainingReg,
+                                       unsigned MinNumRegs) {
+  const LLT RegTy = getType(Reg);
+  const LLT ConstrainingRegTy = getType(ConstrainingReg);
+  if (RegTy.isValid() && ConstrainingRegTy.isValid() &&
+      RegTy != ConstrainingRegTy)
+    return false;
+  const auto ConstrainingRegCB = getRegClassOrRegBank(ConstrainingReg);
+  if (!ConstrainingRegCB.isNull()) {
+    const auto RegCB = getRegClassOrRegBank(Reg);
+    if (RegCB.isNull())
+      setRegClassOrRegBank(Reg, ConstrainingRegCB);
+    else if (RegCB.is<const TargetRegisterClass *>() !=
+             ConstrainingRegCB.is<const TargetRegisterClass *>())
+      return false;
+    else if (RegCB.is<const TargetRegisterClass *>()) {
+      if (!::constrainRegClass(
+              *this, Reg, RegCB.get<const TargetRegisterClass *>(),
+              ConstrainingRegCB.get<const TargetRegisterClass *>(), MinNumRegs))
+        return false;
+    } else if (RegCB != ConstrainingRegCB)
+      return false;
+  }
+  if (ConstrainingRegTy.isValid())
+    setType(Reg, ConstrainingRegTy);
+  return true;
+}
+
+bool
+MachineRegisterInfo::recomputeRegClass(unsigned Reg) {
+  const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
+  const TargetRegisterClass *OldRC = getRegClass(Reg);
+  const TargetRegisterClass *NewRC =
+      getTargetRegisterInfo()->getLargestLegalSuperClass(OldRC, *MF);
+
+  // Stop early if there is no room to grow.
+  if (NewRC == OldRC)
+    return false;
+
+  // Accumulate constraints from all uses.
+  for (MachineOperand &MO : reg_nodbg_operands(Reg)) {
+    // Apply the effect of the given operand to NewRC.
+    MachineInstr *MI = MO.getParent();
+    unsigned OpNo = &MO - &MI->getOperand(0);
+    NewRC = MI->getRegClassConstraintEffect(OpNo, NewRC, TII,
+                                            getTargetRegisterInfo());
+    if (!NewRC || NewRC == OldRC)
+      return false;
+  }
+  setRegClass(Reg, NewRC);
+  return true;
+}
+
+unsigned MachineRegisterInfo::createIncompleteVirtualRegister(StringRef Name) {
+  unsigned Reg = TargetRegisterInfo::index2VirtReg(getNumVirtRegs());
+  VRegInfo.grow(Reg);
+  RegAllocHints.grow(Reg);
+  insertVRegByName(Name, Reg);
+  return Reg;
+}
+
+/// createVirtualRegister - Create and return a new virtual register in the
+/// function with the specified register class.
+///
+Register
+MachineRegisterInfo::createVirtualRegister(const TargetRegisterClass *RegClass,
+                                           StringRef Name) {
+  assert(RegClass && "Cannot create register without RegClass!");
+  assert(RegClass->isAllocatable() &&
+         "Virtual register RegClass must be allocatable.");
+
+  // New virtual register number.
+  unsigned Reg = createIncompleteVirtualRegister(Name);
+  VRegInfo[Reg].first = RegClass;
+  if (TheDelegate)
+    TheDelegate->MRI_NoteNewVirtualRegister(Reg);
+  return Reg;
+}
+
+Register MachineRegisterInfo::cloneVirtualRegister(Register VReg,
+                                                   StringRef Name) {
+  unsigned Reg = createIncompleteVirtualRegister(Name);
+  VRegInfo[Reg].first = VRegInfo[VReg].first;
+  setType(Reg, getType(VReg));
+  if (TheDelegate)
+    TheDelegate->MRI_NoteNewVirtualRegister(Reg);
+  return Reg;
+}
+
+void MachineRegisterInfo::setType(unsigned VReg, LLT Ty) {
+  VRegToType.grow(VReg);
+  VRegToType[VReg] = Ty;
+}
+
+Register
+MachineRegisterInfo::createGenericVirtualRegister(LLT Ty, StringRef Name) {
+  // New virtual register number.
+  unsigned Reg = createIncompleteVirtualRegister(Name);
+  // FIXME: Should we use a dummy register class?
+  VRegInfo[Reg].first = static_cast<RegisterBank *>(nullptr);
+  setType(Reg, Ty);
+  if (TheDelegate)
+    TheDelegate->MRI_NoteNewVirtualRegister(Reg);
+  return Reg;
+}
+
+void MachineRegisterInfo::clearVirtRegTypes() { VRegToType.clear(); }
+
+/// clearVirtRegs - Remove all virtual registers (after physreg assignment).
+void MachineRegisterInfo::clearVirtRegs() {
+#ifndef NDEBUG
+  for (unsigned i = 0, e = getNumVirtRegs(); i != e; ++i) {
+    unsigned Reg = TargetRegisterInfo::index2VirtReg(i);
+    if (!VRegInfo[Reg].second)
+      continue;
+    verifyUseList(Reg);
+    llvm_unreachable("Remaining virtual register operands");
+  }
+#endif
+  VRegInfo.clear();
+  for (auto &I : LiveIns)
+    I.second = 0;
+}
+
+void MachineRegisterInfo::verifyUseList(unsigned Reg) const {
+#ifndef NDEBUG
+  bool Valid = true;
+  for (MachineOperand &M : reg_operands(Reg)) {
+    MachineOperand *MO = &M;
+    MachineInstr *MI = MO->getParent();
+    if (!MI) {
+      errs() << printReg(Reg, getTargetRegisterInfo())
+             << " use list MachineOperand " << MO
+             << " has no parent instruction.\n";
+      Valid = false;
+      continue;
+    }
+    MachineOperand *MO0 = &MI->getOperand(0);
+    unsigned NumOps = MI->getNumOperands();
+    if (!(MO >= MO0 && MO < MO0+NumOps)) {
+      errs() << printReg(Reg, getTargetRegisterInfo())
+             << " use list MachineOperand " << MO
+             << " doesn't belong to parent MI: " << *MI;
+      Valid = false;
+    }
+    if (!MO->isReg()) {
+      errs() << printReg(Reg, getTargetRegisterInfo())
+             << " MachineOperand " << MO << ": " << *MO
+             << " is not a register\n";
+      Valid = false;
+    }
+    if (MO->getReg() != Reg) {
+      errs() << printReg(Reg, getTargetRegisterInfo())
+             << " use-list MachineOperand " << MO << ": "
+             << *MO << " is the wrong register\n";
+      Valid = false;
+    }
+  }
+  assert(Valid && "Invalid use list");
+#endif
+}
+
+void MachineRegisterInfo::verifyUseLists() const {
+#ifndef NDEBUG
+  for (unsigned i = 0, e = getNumVirtRegs(); i != e; ++i)
+    verifyUseList(TargetRegisterInfo::index2VirtReg(i));
+  for (unsigned i = 1, e = getTargetRegisterInfo()->getNumRegs(); i != e; ++i)
+    verifyUseList(i);
+#endif
+}
+
+/// Add MO to the linked list of operands for its register.
+void MachineRegisterInfo::addRegOperandToUseList(MachineOperand *MO) {
+  assert(!MO->isOnRegUseList() && "Already on list");
+  MachineOperand *&HeadRef = getRegUseDefListHead(MO->getReg());
+  MachineOperand *const Head = HeadRef;
+
+  // Head points to the first list element.
+  // Next is NULL on the last list element.
+  // Prev pointers are circular, so Head->Prev == Last.
+
+  // Head is NULL for an empty list.
+  if (!Head) {
+    MO->Contents.Reg.Prev = MO;
+    MO->Contents.Reg.Next = nullptr;
+    HeadRef = MO;
+    return;
+  }
+  assert(MO->getReg() == Head->getReg() && "Different regs on the same list!");
+
+  // Insert MO between Last and Head in the circular Prev chain.
+  MachineOperand *Last = Head->Contents.Reg.Prev;
+  assert(Last && "Inconsistent use list");
+  assert(MO->getReg() == Last->getReg() && "Different regs on the same list!");
+  Head->Contents.Reg.Prev = MO;
+  MO->Contents.Reg.Prev = Last;
+
+  // Def operands always precede uses. This allows def_iterator to stop early.
+  // Insert def operands at the front, and use operands at the back.
+  if (MO->isDef()) {
+    // Insert def at the front.
+    MO->Contents.Reg.Next = Head;
+    HeadRef = MO;
+  } else {
+    // Insert use at the end.
+    MO->Contents.Reg.Next = nullptr;
+    Last->Contents.Reg.Next = MO;
+  }
+}
+
+/// Remove MO from its use-def list.
+void MachineRegisterInfo::removeRegOperandFromUseList(MachineOperand *MO) {
+  assert(MO->isOnRegUseList() && "Operand not on use list");
+  MachineOperand *&HeadRef = getRegUseDefListHead(MO->getReg());
+  MachineOperand *const Head = HeadRef;
+  assert(Head && "List already empty");
+
+  // Unlink this from the doubly linked list of operands.
+  MachineOperand *Next = MO->Contents.Reg.Next;
+  MachineOperand *Prev = MO->Contents.Reg.Prev;
+
+  // Prev links are circular, next link is NULL instead of looping back to Head.
+  if (MO == Head)
+    HeadRef = Next;
+  else
+    Prev->Contents.Reg.Next = Next;
+
+  (Next ? Next : Head)->Contents.Reg.Prev = Prev;
+
+  MO->Contents.Reg.Prev = nullptr;
+  MO->Contents.Reg.Next = nullptr;
+}
+
+/// Move NumOps operands from Src to Dst, updating use-def lists as needed.
+///
+/// The Dst range is assumed to be uninitialized memory. (Or it may contain
+/// operands that won't be destroyed, which is OK because the MO destructor is
+/// trivial anyway).
+///
+/// The Src and Dst ranges may overlap.
+void MachineRegisterInfo::moveOperands(MachineOperand *Dst,
+                                       MachineOperand *Src,
+                                       unsigned NumOps) {
+  assert(Src != Dst && NumOps && "Noop moveOperands");
+
+  // Copy backwards if Dst is within the Src range.
+  int Stride = 1;
+  if (Dst >= Src && Dst < Src + NumOps) {
+    Stride = -1;
+    Dst += NumOps - 1;
+    Src += NumOps - 1;
+  }
+
+  // Copy one operand at a time.
+  do {
+    new (Dst) MachineOperand(*Src);
+
+    // Dst takes Src's place in the use-def chain.
+    if (Src->isReg()) {
+      MachineOperand *&Head = getRegUseDefListHead(Src->getReg());
+      MachineOperand *Prev = Src->Contents.Reg.Prev;
+      MachineOperand *Next = Src->Contents.Reg.Next;
+      assert(Head && "List empty, but operand is chained");
+      assert(Prev && "Operand was not on use-def list");
+
+      // Prev links are circular, next link is NULL instead of looping back to
+      // Head.
+      if (Src == Head)
+        Head = Dst;
+      else
+        Prev->Contents.Reg.Next = Dst;
+
+      // Update Prev pointer. This also works when Src was pointing to itself
+      // in a 1-element list. In that case Head == Dst.
+      (Next ? Next : Head)->Contents.Reg.Prev = Dst;
+    }
+
+    Dst += Stride;
+    Src += Stride;
+  } while (--NumOps);
+}
+
+/// replaceRegWith - Replace all instances of FromReg with ToReg in the
+/// machine function.  This is like llvm-level X->replaceAllUsesWith(Y),
+/// except that it also changes any definitions of the register as well.
+/// If ToReg is a physical register we apply the sub register to obtain the
+/// final/proper physical register.
+void MachineRegisterInfo::replaceRegWith(unsigned FromReg, unsigned ToReg) {
+  assert(FromReg != ToReg && "Cannot replace a reg with itself");
+
+  const TargetRegisterInfo *TRI = getTargetRegisterInfo();
+
+  // TODO: This could be more efficient by bulk changing the operands.
+  for (reg_iterator I = reg_begin(FromReg), E = reg_end(); I != E; ) {
+    MachineOperand &O = *I;
+    ++I;
+    if (TargetRegisterInfo::isPhysicalRegister(ToReg)) {
+      O.substPhysReg(ToReg, *TRI);
+    } else {
+      O.setReg(ToReg);
+    }
+  }
+}
+
+/// getVRegDef - Return the machine instr that defines the specified virtual
+/// register or null if none is found.  This assumes that the code is in SSA
+/// form, so there should only be one definition.
+MachineInstr *MachineRegisterInfo::getVRegDef(unsigned Reg) const {
+  // Since we are in SSA form, we can use the first definition.
+  def_instr_iterator I = def_instr_begin(Reg);
+  assert((I.atEnd() || std::next(I) == def_instr_end()) &&
+         "getVRegDef assumes a single definition or no definition");
+  return !I.atEnd() ? &*I : nullptr;
+}
+
+/// getUniqueVRegDef - Return the unique machine instr that defines the
+/// specified virtual register or null if none is found.  If there are
+/// multiple definitions or no definition, return null.
+MachineInstr *MachineRegisterInfo::getUniqueVRegDef(unsigned Reg) const {
+  if (def_empty(Reg)) return nullptr;
+  def_instr_iterator I = def_instr_begin(Reg);
+  if (std::next(I) != def_instr_end())
+    return nullptr;
+  return &*I;
+}
+
+bool MachineRegisterInfo::hasOneNonDBGUse(unsigned RegNo) const {
+  use_nodbg_iterator UI = use_nodbg_begin(RegNo);
+  if (UI == use_nodbg_end())
+    return false;
+  return ++UI == use_nodbg_end();
+}
+
+bool MachineRegisterInfo::hasOneNonDBGUser(unsigned RegNo) const {
+  use_instr_nodbg_iterator UI = use_instr_nodbg_begin(RegNo);
+  if (UI == use_instr_nodbg_end())
+    return false;
+  return ++UI == use_instr_nodbg_end();
+}
+
+/// clearKillFlags - Iterate over all the uses of the given register and
+/// clear the kill flag from the MachineOperand. This function is used by
+/// optimization passes which extend register lifetimes and need only
+/// preserve conservative kill flag information.
+void MachineRegisterInfo::clearKillFlags(unsigned Reg) const {
+  for (MachineOperand &MO : use_operands(Reg))
+    MO.setIsKill(false);
+}
+
+bool MachineRegisterInfo::isLiveIn(unsigned Reg) const {
+  for (livein_iterator I = livein_begin(), E = livein_end(); I != E; ++I)
+    if (I->first == Reg || I->second == Reg)
+      return true;
+  return false;
+}
+
+/// getLiveInPhysReg - If VReg is a live-in virtual register, return the
+/// corresponding live-in physical register.
+unsigned MachineRegisterInfo::getLiveInPhysReg(unsigned VReg) const {
+  for (livein_iterator I = livein_begin(), E = livein_end(); I != E; ++I)
+    if (I->second == VReg)
+      return I->first;
+  return 0;
+}
+
+/// getLiveInVirtReg - If PReg is a live-in physical register, return the
+/// corresponding live-in physical register.
+unsigned MachineRegisterInfo::getLiveInVirtReg(unsigned PReg) const {
+  for (livein_iterator I = livein_begin(), E = livein_end(); I != E; ++I)
+    if (I->first == PReg)
+      return I->second;
+  return 0;
+}
+
+/// EmitLiveInCopies - Emit copies to initialize livein virtual registers
+/// into the given entry block.
+void
+MachineRegisterInfo::EmitLiveInCopies(MachineBasicBlock *EntryMBB,
+                                      const TargetRegisterInfo &TRI,
+                                      const TargetInstrInfo &TII) {
+  // Emit the copies into the top of the block.
+  for (unsigned i = 0, e = LiveIns.size(); i != e; ++i)
+    if (LiveIns[i].second) {
+      if (use_nodbg_empty(LiveIns[i].second)) {
+        // The livein has no non-dbg uses. Drop it.
+        //
+        // It would be preferable to have isel avoid creating live-in
+        // records for unused arguments in the first place, but it's
+        // complicated by the debug info code for arguments.
+        LiveIns.erase(LiveIns.begin() + i);
+        --i; --e;
+      } else {
+        // Emit a copy.
+        BuildMI(*EntryMBB, EntryMBB->begin(), DebugLoc(),
+                TII.get(TargetOpcode::COPY), LiveIns[i].second)
+          .addReg(LiveIns[i].first);
+
+        // Add the register to the entry block live-in set.
+        EntryMBB->addLiveIn(LiveIns[i].first);
+      }
+    } else {
+      // Add the register to the entry block live-in set.
+      EntryMBB->addLiveIn(LiveIns[i].first);
+    }
+}
+
+LaneBitmask MachineRegisterInfo::getMaxLaneMaskForVReg(unsigned Reg) const {
+  // Lane masks are only defined for vregs.
+  assert(TargetRegisterInfo::isVirtualRegister(Reg));
+  const TargetRegisterClass &TRC = *getRegClass(Reg);
+  return TRC.getLaneMask();
+}
+
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
+LLVM_DUMP_METHOD void MachineRegisterInfo::dumpUses(unsigned Reg) const {
+  for (MachineInstr &I : use_instructions(Reg))
+    I.dump();
+}
+#endif
+
+void MachineRegisterInfo::freezeReservedRegs(const MachineFunction &MF) {
+  ReservedRegs = getTargetRegisterInfo()->getReservedRegs(MF);
+  assert(ReservedRegs.size() == getTargetRegisterInfo()->getNumRegs() &&
+         "Invalid ReservedRegs vector from target");
+}
+
+bool MachineRegisterInfo::isConstantPhysReg(unsigned PhysReg) const {
+  assert(TargetRegisterInfo::isPhysicalRegister(PhysReg));
+
+  const TargetRegisterInfo *TRI = getTargetRegisterInfo();
+  if (TRI->isConstantPhysReg(PhysReg))
+    return true;
+
+  // Check if any overlapping register is modified, or allocatable so it may be
+  // used later.
+  for (MCRegAliasIterator AI(PhysReg, TRI, true);
+       AI.isValid(); ++AI)
+    if (!def_empty(*AI) || isAllocatable(*AI))
+      return false;
+  return true;
+}
+
+bool
+MachineRegisterInfo::isCallerPreservedOrConstPhysReg(unsigned PhysReg) const {
+  const TargetRegisterInfo *TRI = getTargetRegisterInfo();
+  return isConstantPhysReg(PhysReg) ||
+      TRI->isCallerPreservedPhysReg(PhysReg, *MF);
+}
+
+/// markUsesInDebugValueAsUndef - Mark every DBG_VALUE referencing the
+/// specified register as undefined which causes the DBG_VALUE to be
+/// deleted during LiveDebugVariables analysis.
+void MachineRegisterInfo::markUsesInDebugValueAsUndef(unsigned Reg) const {
+  // Mark any DBG_VALUE that uses Reg as undef (but don't delete it.)
+  MachineRegisterInfo::use_instr_iterator nextI;
+  for (use_instr_iterator I = use_instr_begin(Reg), E = use_instr_end();
+       I != E; I = nextI) {
+    nextI = std::next(I);  // I is invalidated by the setReg
+    MachineInstr *UseMI = &*I;
+    if (UseMI->isDebugValue())
+      UseMI->getOperand(0).setReg(0U);
+  }
+}
+
+static const Function *getCalledFunction(const MachineInstr &MI) {
+  for (const MachineOperand &MO : MI.operands()) {
+    if (!MO.isGlobal())
+      continue;
+    const Function *Func = dyn_cast<Function>(MO.getGlobal());
+    if (Func != nullptr)
+      return Func;
+  }
+  return nullptr;
+}
+
+static bool isNoReturnDef(const MachineOperand &MO) {
+  // Anything which is not a noreturn function is a real def.
+  const MachineInstr &MI = *MO.getParent();
+  if (!MI.isCall())
+    return false;
+  const MachineBasicBlock &MBB = *MI.getParent();
+  if (!MBB.succ_empty())
+    return false;
+  const MachineFunction &MF = *MBB.getParent();
+  // We need to keep correct unwind information even if the function will
+  // not return, since the runtime may need it.
+  if (MF.getFunction().hasFnAttribute(Attribute::UWTable))
+    return false;
+  const Function *Called = getCalledFunction(MI);
+  return !(Called == nullptr || !Called->hasFnAttribute(Attribute::NoReturn) ||
+           !Called->hasFnAttribute(Attribute::NoUnwind));
+}
+
+bool MachineRegisterInfo::isPhysRegModified(unsigned PhysReg,
+                                            bool SkipNoReturnDef) const {
+  if (UsedPhysRegMask.test(PhysReg))
+    return true;
+  const TargetRegisterInfo *TRI = getTargetRegisterInfo();
+  for (MCRegAliasIterator AI(PhysReg, TRI, true); AI.isValid(); ++AI) {
+    for (const MachineOperand &MO : make_range(def_begin(*AI), def_end())) {
+      if (!SkipNoReturnDef && isNoReturnDef(MO))
+        continue;
+      return true;
+    }
+  }
+  return false;
+}
+
+bool MachineRegisterInfo::isPhysRegUsed(unsigned PhysReg) const {
+  if (UsedPhysRegMask.test(PhysReg))
+    return true;
+  const TargetRegisterInfo *TRI = getTargetRegisterInfo();
+  for (MCRegAliasIterator AliasReg(PhysReg, TRI, true); AliasReg.isValid();
+       ++AliasReg) {
+    if (!reg_nodbg_empty(*AliasReg))
+      return true;
+  }
+  return false;
+}
+
+void MachineRegisterInfo::disableCalleeSavedRegister(unsigned Reg) {
+
+  const TargetRegisterInfo *TRI = getTargetRegisterInfo();
+  assert(Reg && (Reg < TRI->getNumRegs()) &&
+         "Trying to disable an invalid register");
+
+  if (!IsUpdatedCSRsInitialized) {
+    const MCPhysReg *CSR = TRI->getCalleeSavedRegs(MF);
+    for (const MCPhysReg *I = CSR; *I; ++I)
+      UpdatedCSRs.push_back(*I);
+
+    // Zero value represents the end of the register list
+    // (no more registers should be pushed).
+    UpdatedCSRs.push_back(0);
+
+    IsUpdatedCSRsInitialized = true;
+  }
+
+  // Remove the register (and its aliases from the list).
+  for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI)
+    UpdatedCSRs.erase(std::remove(UpdatedCSRs.begin(), UpdatedCSRs.end(), *AI),
+                      UpdatedCSRs.end());
+}
+
+const MCPhysReg *MachineRegisterInfo::getCalleeSavedRegs() const {
+  if (IsUpdatedCSRsInitialized)
+    return UpdatedCSRs.data();
+
+  return getTargetRegisterInfo()->getCalleeSavedRegs(MF);
+}
+
+void MachineRegisterInfo::setCalleeSavedRegs(ArrayRef<MCPhysReg> CSRs) {
+  if (IsUpdatedCSRsInitialized)
+    UpdatedCSRs.clear();
+
+  for (MCPhysReg Reg : CSRs)
+    UpdatedCSRs.push_back(Reg);
+
+  // Zero value represents the end of the register list
+  // (no more registers should be pushed).
+  UpdatedCSRs.push_back(0);
+  IsUpdatedCSRsInitialized = true;
+}
+
+bool MachineRegisterInfo::isReservedRegUnit(unsigned Unit) const {
+  const TargetRegisterInfo *TRI = getTargetRegisterInfo();
+  for (MCRegUnitRootIterator Root(Unit, TRI); Root.isValid(); ++Root) {
+    bool IsRootReserved = true;
+    for (MCSuperRegIterator Super(*Root, TRI, /*IncludeSelf=*/true);
+         Super.isValid(); ++Super) {
+      unsigned Reg = *Super;
+      if (!isReserved(Reg)) {
+        IsRootReserved = false;
+        break;
+      }
+    }
+    if (IsRootReserved)
+      return true;
+  }
+  return false;
+}