compiler/optimizing/code_generator_x86.cc [1583:1605]:
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void LocationsBuilderX86::VisitSelect(HSelect* select) {
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(select);
  if (Primitive::IsFloatingPointType(select->GetType())) {
    locations->SetInAt(0, Location::RequiresFpuRegister());
    locations->SetInAt(1, Location::Any());
  } else {
    locations->SetInAt(0, Location::RequiresRegister());
    if (SelectCanUseCMOV(select)) {
      if (select->InputAt(1)->IsConstant()) {
        // Cmov can't handle a constant value.
        locations->SetInAt(1, Location::RequiresRegister());
      } else {
        locations->SetInAt(1, Location::Any());
      }
    } else {
      locations->SetInAt(1, Location::Any());
    }
  }
  if (IsBooleanValueOrMaterializedCondition(select->GetCondition())) {
    locations->SetInAt(2, Location::RequiresRegister());
  }
  locations->SetOut(Location::SameAsFirstInput());
}
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compiler/optimizing/code_generator_x86_64.cc [1557:1578]:
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void LocationsBuilderX86_64::VisitSelect(HSelect* select) {
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(select);
  if (Primitive::IsFloatingPointType(select->GetType())) {
    locations->SetInAt(0, Location::RequiresFpuRegister());
    locations->SetInAt(1, Location::Any());
  } else {
    locations->SetInAt(0, Location::RequiresRegister());
    if (SelectCanUseCMOV(select)) {
      if (select->InputAt(1)->IsConstant()) {
        locations->SetInAt(1, Location::RequiresRegister());
      } else {
        locations->SetInAt(1, Location::Any());
      }
    } else {
      locations->SetInAt(1, Location::Any());
    }
  }
  if (IsBooleanValueOrMaterializedCondition(select->GetCondition())) {
    locations->SetInAt(2, Location::RequiresRegister());
  }
  locations->SetOut(Location::SameAsFirstInput());
}
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