sql_utils/common/multiprecision_int.cc

/*
 * Copyright 2023 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "sql_utils/common/multiprecision_int.h"

#include <cstdint>
#include <type_traits>

namespace bigquery_ml_utils {
namespace multiprecision_int_impl {
namespace {
template <uint64_t power>
uint64_t DividePower10(VarUintRef<64>& var_int, uint64_t& remainder) {
  remainder = var_int.DivMod(std::integral_constant<uint64_t, power>());
  return power;
}

template <>
uint64_t DividePower10<1>(VarUintRef<64>& var_int, uint64_t& remainder) {
  return 1;
}
}  // namespace

uint64_t (*kVarUintDivModPow10[])(VarUintRef<64>&, uint64_t&) = {
    &DividePower10<1>,
    &DividePower10<10>,
    &DividePower10<100>,
    &DividePower10<1000>,
    &DividePower10<10000>,
    &DividePower10<100000>,
    &DividePower10<1000000>,
    &DividePower10<10000000>,
    &DividePower10<100000000>,
    &DividePower10<1000000000>,
    &DividePower10<10000000000>,
    &DividePower10<100000000000>,
    &DividePower10<1000000000000>,
    &DividePower10<10000000000000>,
    &DividePower10<100000000000000>,
    &DividePower10<1000000000000000>,
    &DividePower10<10000000000000000>,
    &DividePower10<100000000000000000>,
    &DividePower10<1000000000000000000>,
    &DividePower10<10000000000000000000ULL>};
}  // namespace multiprecision_int_impl
}  // namespace bigquery_ml_utils