/*
 * Copyright 2024 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.
 */

// Naive implementation, probably room for optimization...
double round(double d) {
  if (__builtin_floor(d) == d) {
    return d;
  }
  double half;
  if (d < 0.0) {
    if (d > -0.5) {
      return -0.0;
    } else {
      half = -0.5;
    }
  } else {
    half = 0.5;
  }
  return __builtin_floor(d + half);
}