compiler/optimizing/code_generator_x86.cc [6419:6448]:
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void LocationsBuilderX86::VisitCheckCast(HCheckCast* instruction) {
  LocationSummary::CallKind call_kind = LocationSummary::kNoCall;
  bool throws_into_catch = instruction->CanThrowIntoCatchBlock();
  TypeCheckKind type_check_kind = instruction->GetTypeCheckKind();
  switch (type_check_kind) {
    case TypeCheckKind::kExactCheck:
    case TypeCheckKind::kAbstractClassCheck:
    case TypeCheckKind::kClassHierarchyCheck:
    case TypeCheckKind::kArrayObjectCheck:
      call_kind = (throws_into_catch || kEmitCompilerReadBarrier) ?
          LocationSummary::kCallOnSlowPath :
          LocationSummary::kNoCall;  // In fact, call on a fatal (non-returning) slow path.
      break;
    case TypeCheckKind::kArrayCheck:
    case TypeCheckKind::kUnresolvedCheck:
    case TypeCheckKind::kInterfaceCheck:
      call_kind = LocationSummary::kCallOnSlowPath;
      break;
  }
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction, call_kind);
  locations->SetInAt(0, Location::RequiresRegister());
  locations->SetInAt(1, Location::Any());
  // Note that TypeCheckSlowPathX86 uses this "temp" register too.
  locations->AddTemp(Location::RequiresRegister());
  // When read barriers are enabled, we need an additional temporary
  // register for some cases.
  if (TypeCheckNeedsATemporary(type_check_kind)) {
    locations->AddTemp(Location::RequiresRegister());
  }
}
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compiler/optimizing/code_generator_x86_64.cc [5782:5811]:
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void LocationsBuilderX86_64::VisitCheckCast(HCheckCast* instruction) {
  LocationSummary::CallKind call_kind = LocationSummary::kNoCall;
  bool throws_into_catch = instruction->CanThrowIntoCatchBlock();
  TypeCheckKind type_check_kind = instruction->GetTypeCheckKind();
  switch (type_check_kind) {
    case TypeCheckKind::kExactCheck:
    case TypeCheckKind::kAbstractClassCheck:
    case TypeCheckKind::kClassHierarchyCheck:
    case TypeCheckKind::kArrayObjectCheck:
      call_kind = (throws_into_catch || kEmitCompilerReadBarrier) ?
          LocationSummary::kCallOnSlowPath :
          LocationSummary::kNoCall;  // In fact, call on a fatal (non-returning) slow path.
      break;
    case TypeCheckKind::kArrayCheck:
    case TypeCheckKind::kUnresolvedCheck:
    case TypeCheckKind::kInterfaceCheck:
      call_kind = LocationSummary::kCallOnSlowPath;
      break;
  }
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction, call_kind);
  locations->SetInAt(0, Location::RequiresRegister());
  locations->SetInAt(1, Location::Any());
  // Note that TypeCheckSlowPathX86_64 uses this "temp" register too.
  locations->AddTemp(Location::RequiresRegister());
  // When read barriers are enabled, we need an additional temporary
  // register for some cases.
  if (TypeCheckNeedsATemporary(type_check_kind)) {
    locations->AddTemp(Location::RequiresRegister());
  }
}
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